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**Announcement on the Tender for the Procurement of Equipment for Energy Saving Modifications of CFB Boilers at the Methanol Branch of Ningxia Coal Industry Co., Ltd. Author/Source: Date: 2022-01-24 Clicks: 6 2. Project Overview and Scope of the Tender 2.1 Project Overview, Scope of the Tender, and Division into Bids/Packages: 2.1.1 Project Overview: The Methanol Branch has a total of 4 circulating fluidized bed (CFB) boilers, which are operated in a three-in-one-backup configuration with a master control system. The DCS systems of the four boilers are all controlled by the Zhejiang Zhongkong ECS700 system, with version number V4.5. Among them, Boiler No. 2 has a designed capacity of 220 t/h; it was manufactured by Dongfang Boiler Factory. Electric control valves are used for regulating the boiler feed water, while pneumatic damper actuators are employed to control the air flow rate of the primary fan and the two exhaust fans. Electric control valves are used for regulating the air flow rate of the secondary fan. The remaining three boilers have a design capacity of 240 t/h (boilers #1, #3, and #4); they were manufactured by Jinan Boiler Factory. Electric control valves are used for regulating the boiler feed water, while hydraulic couplings are employed to control the air flow rate of the primary fans, secondary fans, and the two exhaust fans. Circuits such as the drum water level, desuperheating water, main steam pressure, main steam temperature, coal feeding, air supply, exhaust air, and slag discharge are all under manual remote control. The four-boiler system faces control challenges specific to circulating fluidized bed boilers, such as large lag in the combustion process, severe coupling, and nonlinear characteristics of the combustion process. The coal quality, as well as the humidity and particle size of the coal, have a significant impact on the bed temperature and combustion characteristics. The effect of coal feed rate and air volume on bed temperature is unpredictable; it often increases first and then decreases, or decreases first and then increases, showing strong non-linear characteristics. In the automatic control loops configured for DCS, it is not possible to achieve long-term closed-loop automatic operation for feedwater control to the steam drum, coal feeding control, primary air control, secondary air-oxygen level control, bed pressure control, exhaust air control, and coordinated control; instead, manual operation by operators is required. This not only increases the difficulty of operation but also prevents the desulfurization and denitrification systems in each boiler from adapting to complex changes in operating conditions, resulting in poor control of NOx and SO2 concentrations as well as inadequate control of ammonia escape. As a result, it is difficult for CFB boiler systems to meet their design requirements. 2.1.2 Scope of the bidding: 2.1.2.1 Details of the main equipment to be supplied 2.1.2.2 Scope of software services 1) Analyze the operating conditions of the existing 4 CFB boilers, utilize big data to develop advanced control models, optimize control strategies, achieve optimal operating conditions, and thus reduce energy consumption ； 2) Logical optimization of conventional DCS systems to achieve automatic combustion control, including but not limited to the following control loops: main steam pressure, main steam temperature, furnace pressure, flue gas oxygen level, primary air pressure, primary air volume, secondary air pressure, secondary air volume, nitrogen oxides, deaerator water level, deaerator pressure, deaerator temperature, return material system pressure, return material flow rate, return material temperature, feedwater control, total air volume control, flue gas adjustment dampers, air chamber pressure and slag discharge, left and right primary temperature reducers, left and right secondary temperature reducers, as well as all other automatic control functions. 3) The models to be established shall include, but are not limited to, the following control loops: boiler load control loop, drum water level control loop, main steam temperature control loop, furnace negative pressure control loop, primary and secondary air control loops, combustion optimization control loop, multi-boiler coordinated optimization control loop, bed thickness optimization control, bed temperature optimization control, and coordination and balance between the steam pressure at the boiler outlet and the steam pressure in the pipeline system ； 4) Through comprehensive system data modeling and analysis, abnormal operating conditions are detected in advance, alerting operators to take preventive actions. The main operational faults of the boiler are incorporated into the intelligent voice alarm model; when a certain fault occurs or is about to occur, the system should directly locate the relevant instrument measurement point and issue an alarm. 5) A dedicated third-party intelligent APC (Advanced Process Control) system, independent of the DCS control system, shall be installed, and advanced control techniques such as predictive control, fuzzy control, and neural networks shall be employed to optimize the control functions for all circuits related to the power units within the scope of this bidding, including coordinated control and control of main steam temperature and pressure. 6) Responsible for the design optimization of control energy-saving systems, system integration, equipment supply, installation, system commissioning, and training of operators. 2.2 Others: 2.2.1 Delivery period: Delivery shall be made within 60 days after the contract is signed. 2.2.2 Delivery location: **Coal-to-Oil Chemicals Warehousing and Distribution Center of Ningxia Coal Industry Materials Company, Energy Group. 2.2.3 Payment method: Settlement is made on a per-order basis; 60% of the payment is due upon delivery when the goods are inspected and found to be satisfactory, and after receipt of the full amount of VAT invoice. Another 30% is paid once the installation, commissioning, and operation are complete. A 10% quality guarantee deposit is retained, and this amount will be refunded in full without interest once the warranty period expires without any quality issues. 2.2.4 Payment method: fully guaranteed bill of exchange. 2.2.5 Warranty period: 18 months from the date of delivery and acceptance, or 12 months from the date when normal operation begins, whichever comes first. 3. Qualification requirements for bidders 3.1 Qualification conditions and performance requirements: [1] Qualification requirements: (1) The bidder must be an independently registered legal entity or other organization, and must provide valid supporting documents. (2) The bidder must be a manufacturer capable of independently developing and applying the software for this project. 【2】Financial requirements: / 【3】Performance requirements: From January 2010 to the bid deadline (subject to the contract signing date), the bidder must have experience in carrying out combustion optimization upgrades on at least 5 circulating fluidized bed boilers (including at least 2 boilers with an evaporation capacity of 220 t/h or more), all of which have been in operation successfully for 1 year or more. Bidders must provide scanned copies of contracts that demonstrate compliance with the performance requirements for this tender, along with corresponding customer verification documents. The scanned contract copies must include at least the pages bearing the signatures of both parties to the contract, the date the contract was signed, and the key information specified in the performance requirements ； The user certification must be stamped by the end-user; it can be an acceptance certificate, a usage certificate, follow-up inspection records, or other documents that can prove that the subject matter of the contract has been in use for 1 year or more from the date of commissioning until the deadline for submission of bids. 【4】Credit requirements: / 【5】Other requirements: / Note: Qualifications and performance records of parent and subsidiary companies cannot be used interchangeably. 3.2 Joint bids are not accepted for this project. 3.3 Agents are not permitted to submit bids for this project. 4. Acquisition of tender documents *The purchase of tender documents begins on 2022-01-24 at 10:00:00, and the deadline for purchasing them is 2022-01-29 at 17:00:00. 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