China Aluminum Shanxi New Material Clinker Kiln Flue Gas Denitrification Environmental Protection Project (Lot 1) General Contracting Tender Announcement

The electronic bidding platform of Chinalco Group released the general contract bidding announcement for the environmental protection project of clinker kiln flue gas denitrification in the first alumina plant of Chinalco Shanxi New Materials Co., Ltd. (Bid Section 1). The details are as follows:

China Aluminum Shanxi New Materials Co., Ltd. First Alumina Plant Clinker Kiln Flue Gas Denitrification Environmental Protection Project (Lot 1) General Contract Tender Announcement

(Tender No.: 0122-ZB00234)

1. Tendering Conditions

The general contract for the environmental protection project of clinker kiln flue gas denitrification in the first alumina plant of Chinalco Shanxi New Materials Co., Ltd. (bid section 1) (bidding project number: 0122-ZB00234/01) has been approved by the project approval/approval/recording authority , the source of project funds is self-raised by the enterprise, and the tenderer is Chinalco Shanxi New Materials Co., Ltd. The project has already met the bidding conditions and is now open for bidding.

2. Project Overview and Tender Scope

2.1 Project name: General contracting of the environmental protection project of flue gas denitrification in clinker kiln of the first alumina plant of Chinalco Shanxi New Materials Co., Ltd. (Lot 1)

2.2 Project Type: General Contracting

2.3 Project Location: Hejin City, Shanxi Province

2.4 Tender content:

2.4.1 Scope of bidding:

Demolition, scheme planning, preliminary design, process design, construction drawing design, equipment (including non-standard equipment) design, equipment selection, equipment and raw and auxiliary materials involved in the environmental protection project of clinker kiln flue gas denitrification in the First Alumina Plant procurement and supply of equipment, installation of equipment, supply and installation of process piping and its accessories, supply and installation of electrical instruments, transportation and hoisting of equipment and raw materials, commissioning, testing and inspection, start of trial operation, and completion with the Employer Load test run and production up to standard to assessment and acceptance, functional assessment and handover, as well as project warranty, cooperate with the project headquarters for acceptance, cooperate with project audit and post-evaluation, and cooperate with the completion of formalities for approval. Parts not included in the above omissions and not clearly designated by the developer, but at the same time, this part is indispensable to the general contracting of the project, and the contractor is responsible for implementation to ensure the integrity of the entire project. The contractor is generally responsible to the developer in terms of quality, construction period, investment, etc., and the procurement of machinery and equipment materials (excluding low-temperature catalysts). The project design also includes the compilation of special articles on the design of project safety facilities and the design of occupational disease protection facilities, and is responsible for passing the review. Prepare special articles on fire protection design or cooperate with fire protection acceptance related design documents as needed. Organize experts to review the special construction plan of the dangerous project. The automatic control DCS system operation station is placed in the main control room of the big kiln. The system reserves the communication function with the clinker kiln DCS system in the main control room of the big kiln, and reserves the required standard interfaces and cards. All demolition equipment and materials shall be delivered to the place designated by Party A with a handover list attached. The protection of relevant facilities and pipelines, and the transportation of garbage to the place designated by Party A or the discharge place specified by the local government, etc. The specific tender contents of this tender section are as follows:

(1) Project design: It includes all the content involved in the clinker kiln denitrification project and the overall design of the profession, including the preliminary design, construction drawing design, and the compilation of the project safety facility design and occupational disease protection facility design. review. Prepare special articles on fire protection design or cooperate with fire protection acceptance related design documents as needed.

(2) Supply and construction and installation: Responsible for equipment and material supply and construction and installation of SCR denitration system, urea storage and dissolution system, urea catalytic hydrolysis system, compressed air system, automatic control and power distribution system. The pipeline system (dust collection to the inlet of the denitration device, and the outlet of the fan to the chimney), civil engineering, reconstruction of high-voltage distribution cabinets, and auxiliary pipeline facilities (qualified water, steam, and gas pipelines) are not within the scope of supply and construction of this tender section, but The supply of flue system valves and the installation of denitration catalysts are included in the scope of supply and construction of this tender section.

(3) Construction and installation projects such as denitration catalyst, flue system, civil engineering, reconstruction of high-voltage power distribution cabinet, auxiliary pipeline facilities (water supply, steam supply, gas supply) not included in this bidding section, but closely related to this project. The design of the project is all included in this tender.

2.4.2 Project construction content:

2.4.2.1 Construction of urea dissolution preparation system

The two sets of clinker kiln SCR denitration devices share one set of urea solution preparation system.

2.4.2.2 Construction of urea hydrolysis system: The ammonia gas preparation of this project adopts urea catalytic hydrolysis process, and the selection of urea hydrolyzer is considered to meet the consumption of 2 sets of SCR. The equipment on the urea catalytic hydrolyzer needs to be explosion-proof. The urea catalytic hydrolysis reaction system mainly includes: hydrolysis reaction module, steam heating system, urea metering supply system, measurement and control system, heat tracing system, sewage system and steam purging system.

2.4.2.3 Construction of SCR reaction system

After the existing electrostatic precipitator, the SCR reaction system is arranged, and one set of SCR denitration system is constructed in the clinker kilns of 1# and 2# (only one set of 1# and 2# kilns can be operated), and the clinker kilns of 3# and 4# are constructed. 1 set of SCR denitration system (only one set of 3# and 4# kilns can operate), a total of 2 sets of denitration systems are constructed.

This project is equipped with 2 SCR reactors. The SCR reactor body includes: the reactor flow field optimization device; the separator on the reactor cover; the rectification device; the support of the catalyst layer (including the reserved layer); the sealing device of the catalyst layer ; Catalyst hoisting and handling devices, etc. The catalyst layer is set to 3 layers in a 3+1 manner, and the catalyst is reserved for the uppermost layer. Four rake soot blowers are arranged above each catalyst layer, totaling 12 rake soot blowers, and the reserved layer has an interface.

The catalyst for the SCR denitration system of the clinker kiln in this project is planned to be a low-temperature V2O5-WO3/TiO2 honeycomb catalyst. The number of catalysts is designed strictly according to the requirements, and the balance is properly considered. The clinker kiln further optimizes production operations, reduces air leakage, ensures that the inlet flue gas temperature of the denitration reactor is ≥170 °C, the NOx content of the catalyst inlet flue gas is about 450 mg/Nm3, and the NOx content of the outlet flue gas after purification is ≤50 mg/Nm3. The temperature drop at the inlet and outlet of the zone is not higher than 10 °C.

To increase the service life of the catalyst, install a soot blower. According to the characteristics of flue gas and ash in this project, a heated air rake soot blower is installed before each layer of catalyst, and compressed air is used as the soot blowing medium after being heated by the flue heat exchanger, so that the soot deposited at the entrance of the catalyst can be removed at any time. Fly ash is blown to prevent clogging of catalyst channels.

2.4.2.4 Construction of an offline analysis system for denitration catalysts

2 sets of clinker kiln SCR denitration units are equipped with 1 set of catalyst analysis system. The heat source of the catalyst desorption system is a hot blast stove with coke oven gas as fuel, the hot blast volume is over 300,000 Nm3/h, the hot blast temperature is 350-420°C, and the SCR catalyst desorption is about 72 hours. The ammonium hydrogen sulfate attached on the SCR denitration catalyst evaporates and decomposes at this temperature, and the SCR denitration catalyst is regenerated. At the same time, it is necessary to fully consider the uniformity requirements of the temperature field in the SCR reactor to ensure uniform temperature distribution, so that the catalyst can be fully decomposed.

2.4.2.5 Construction of denitrification flue gas pipeline system

The flue gas system refers to the connecting flue from the outlet of the electrostatic precipitator to the inlet of the SCR reactor body, the outlet of the SCR reactor body to the booster fan and the chimney, and includes the flue baffle, rectifier grille, and flue. Supports and hangers, manhole doors, expansion joints and all other components. A guide plate is arranged in the flue, and a rectifying grille is arranged before entering the catalyst layer.

During the construction of the flue gas pipeline system of this project, the actual production needs are fully considered to meet the production needs to the greatest extent. The flue gas of 1# kiln and 2# kiln exits the bell mouth of the electrostatic precipitator, and the flues are connected horizontally and then reach the SCR denitration reactor vertically. The valve on the horizontal flue can realize that 1# SCR corresponds to 1# kiln flue gas or 2# kiln flue gas Switching of flue gas. The flue gas from the 3# kiln and 4# kiln exits the bell mouth of the electrostatic precipitator, and the flues are connected horizontally to each other and then reach the SCR denitration reactor vertically. The valve on the horizontal flue can realize that 2#SCR corresponds to 3# kiln flue gas or 4# kiln Switching of flue gas.

2.4.2.6 Construction of compressed air system

This project plans to select 2 screw air compressors, all of which are in operation and have no backup. It is equipped with a dryer and a gas storage tank. In addition, at the same time, the air compressor station of the old alumina system has an existing (6KV, 91m3/min 0.8MPa) air compressor. Bidders can choose the optimal compressed air plan according to the situation.

2.4.2.7 Supporting the construction of power distribution and automatic control systems, public pipelines, etc.

The transformers of this project need to select 2 sets of 6/0.4kV transformers, 2 sets of transformers and 2 sets of high-voltage inverter power supply lines of 6kV heavy-duty fans, which are drawn from 2 high-voltage power distribution rooms around the project (No. 4 power distribution room, No. 6 power distribution room), to meet the electricity load required by this project. The high-voltage 6KV system power cable adopts ZRC-YJLV22 type cable, and the low-voltage 380V system power cable adopts YJV type cable.

2 clinker kilns are equipped with a set of DCS control system for denitration, and the DCS control system is equipped with an engineer station and an operator station. The operator station is placed in the main control room of the clinker kiln. The denitration DCS control system is planned to use domestic first-line brands. The flue gas inlet of the denitrification device needs to be newly installed on-line detection, and the online detection of the flue gas outlet of the denitration device can use the existing online monitoring device, and install ammonia escape at the same time.

Supporting the construction of gas, steam, qualified water and other pipelines.

2.4.3 Engineering Boundaries

(1) Electrical system: The bidder designates the location of 4 high-voltage cabinets of 6KV power distribution room that need to be transformed. The contents of the transformation of a single high-voltage cabinet include -1 knife, microcomputer protection device, current transformer, five defenses, and the microcomputer protection device requires communication. to the backend of the computer in the power distribution room. The bidder is responsible for the design of this content;

(2) Water supply and drainage system: The water supply and drainage system includes circulating water, domestic water, demineralized water and sewage, etc. The location of the water source designated by the tenderee (within 250 meters from the site). The part of domestic wastewater discharge shall be designated by the tenderee (within 150 meters from the site).

(3) Steam system: The tenderee shall designate the access location of the steam pipeline (within 250 meters from the site). The steam pressure at the steam interface is about 0.7MPa and the temperature is about 250℃.

(4) Gas pipeline: The tenderee shall designate the access location of the coke oven gas pipeline (within 500 meters from the site).

(5) Flue: Take the expansion joint at the outlet of the dust collector (excluding the expansion joint) as the boundary;

2.4.4 The transformation needs to meet the following requirements:

(1) In this denitration transformation, after the denitration device is in normal operation, the NOx emission concentration of the clinker kiln flue gas meets the emission standard of less than 50mg/Nm3 (standard condition, dry basis, actual oxygen), and NH3 (escape) ≤ 3ppm. Within any load range of the kiln, the SO2/SO3 conversion rate is less than 1%; the denitrification system should be able to run continuously and stably synchronously with the clinker kiln, with good adaptability and not affect the production capacity of the clinker kiln; the site conditions should be fully considered in the equipment layout.

(2) The denitration system and supporting facilities of the clinker kiln adopt a set of DCS centralized control, and the interconnection function with the main control DCS system of the clinker kiln should be reserved for the selection of DCS.

(3) The increase in the resistance of each SCR system (including but not limited to the total resistance of the flue and denitration reactor) should not exceed 1200Pa;

(4) The system conducts thermal insulation treatment, which meets the requirements of relevant national standards.

(5) All power distribution and operation control equipment are selected according to the principles of safety, reliability, energy saving, advanced and unified spare parts.

(6) The electrical fire protection design implements the policy of "prevention first, combined with fire prevention and fire protection", and configures necessary fire protection measures to prevent and reduce fire hazards.

(7) During the construction of the environmental protection renovation of the flue gas denitration of the clinker kiln, if there is any damage to the surrounding facilities, it shall be restored to its original state after the renovation.

(8) The color of the denitration device of the clinker kiln flue gas denitration environmental protection project and the appearance color of the on-site buildings must conform to the Chinalco visual identification system;

(9) The main equipment brands adopted by the bidder shall meet the "main equipment requirements" of the tenderee (see Chapter 5, Section 1, Article 5), and try to be consistent with the existing equipment on site.

(10) The thickness of the anti-corrosion coating paint film for the design of the outdoor steel structure meets the standard requirements of the design service life of the anti-corrosion protective layer not less than 5 years.

2.5 Technical route:

The technical route of the clinker kiln denitration system is planned to adopt the low-temperature SCR selective catalytic reduction technology, and ammonia gas is planned to be used as the denitration reducing agent (the process of urea catalytic hydrolysis to produce ammonia). Realize NOx emission to meet ultra-low emission requirements (NOx≤50mg/Nm3).

2.6 Duration:

The reconstruction of 2 clinker kiln denitrification devices will be constructed at the same time, with a total construction period of 90 days (after the contract is signed). The two denitrification units will be combined, debugged, and put into operation one by one. The first kiln denitrification unit will be ready for operation within 80 days after the contract is signed, and the second denitrification unit will be ready for operation within 90 days after the contract is signed. . And ensure that the public system does not affect the first SCR reactor put into use.

2.7 Quality requirements: excellent

3. Qualification requirements of bidders

3.1 The bidder should be registered in the territory of the People's Republic of China, have the qualification of an independent legal person, meet the requirements of relevant laws and regulations, be able to independently perform the contract, and provide a scanned copy of the business license.

3.2 The bidder shall possess the Grade A qualification for the special project of engineering design and environmental engineering (air pollution prevention and control project) issued by the competent construction administrative department, or the Grade A qualification for the speciality of metal smelting engineering in the metallurgical industry of engineering design, and provide a scanned copy of the qualification certificate.

3.3 The bidder shall have and provide the EPC project general contracting performance for air pollution control (low temperature SCR technology) (flue gas treatment capacity of a single unit under working conditions ≥ 400000m3/h), and have completed at least one low temperature SCR denitrification project, and the operating time Project export NOx≤50mg/Nm3 (subject to third-party monitoring and acceptance report), and provide relevant certification documents;

3.4 Qualification requirements for the bidder's proposed project manager: The project manager has the qualification of a first-class registered construction engineer specializing in mechanical and electrical engineering, and has a valid safety production assessment certificate (B certificate), and provides relevant supporting documents.

3.5 The bidder has good bank credit and business reputation, is not in a state of being ordered to suspend business, property has been taken over, frozen or bankrupt, and the bidder shall not be listed as a dishonest person subject to execution during the bid evaluation period. The information on the list of dishonest persons subject to enforcement shall be subject to the retrieval results of the Inquiry website and the Credit China website;

3.6 The bidder has not had major or more safety accidents, environmental pollution incidents, employee occupational health accidents and quality accidents in the past three years, and has not had one or more work-related accidents within 12 months, and provide a letter of commitment;

3.7 This project accepts consortium bids. Consortium bids shall meet the following requirements:

① The number of all members of the consortium shall not exceed 2, and the consortium agreement shall be signed jointly.

② The design units of the consortium members shall have the Grade A qualification for the special project of engineering design and environmental engineering (air pollution prevention and control project) issued by the competent construction administrative department, or the Grade A qualification for the speciality of metal smelting engineering in the metallurgical industry of engineering design, and provide a scanned copy of the qualification certificate.

③The construction unit of the consortium member must have the first-level construction qualification of environmental protection engineering professional contracting or metallurgical engineering construction general contracting level, or the mechanical and electrical engineering construction general contracting first-level construction qualification, and have a valid safety production license, and the project leader of the construction unit must Possess a valid first-class registered construction engineer qualification in mechanical and electrical engineering, and have a valid safety production assessment certificate (B certificate), and provide a scanned copy of the relevant certificate.