Flue gas treatment, the booster fan is an adjustable axial fan of the moving blade, and the induced draft fan is used to maintain the negative pressure of the furnace. The booster fan maintains a wind volume relative to the boiler load by adjusting the opening of the fan blade. On the one hand, the flue gas-smoke heat exchanger (GGH) pre-cools the flue gas after dedusting to improve the absorption efficiency of SO2 in the absorption tower and reduce the requirements on the materials such as anticorrosive materials and fillers in the absorption tower; The flue gas treated by the absorption tower prevents low temperature corrosion. The flue gas-smoke heat exchanger (GGH) is a two-segment rotary heat exchanger. The normal operation is driven by two 380 VAC motors with a rotor speed of 115 r/min. In order to prevent the smoke from leaking and corroding GGH, two sealed fans are provided to provide compressed air to seal it. Designed for different working conditions, there are three kinds of ash removal methods: compressed air, low pressure water and high pressure water to prevent ash blocking in GGH.
The absorption tower is the most critical equipment for FGD to complete the desulfurization process. The absorption tower is a packed tower, and the uppermost layer is a mist eliminator to prevent the generation of decaying vapor in the absorption tower into the flue gas-flue gas heat exchanger and the tail flue; a dropper for dispersing seawater from a seawater booster pump; the lower layer is a snowflake-like filler made of polypropylene for increasing the contact area between seawater and smoke; the bottom layer is a seawater pool, and the seawater flows by gravity Aeration tank. All parts of the absorption tower are subjected to strict anti-corrosion treatment. Seawater treatment system, seawater treatment system The seawater treatment system is mainly composed of two 50% capacity seawater booster pumps, two 50% capacity aeration fans and an aeration tank. The seawater treatment aeration tank has undergone strict anti-corrosion treatment. The warm seawater discharged from the condenser and the acidic seawater flowing from the absorption tower react with the fresh air sent from the aeration fan in the aeration tank to restore harmlessness. The sea finally flows back to the sea by gravity. A seawater booster pump is used to supply absorption water to the absorption tower. The aeration tank is divided into five intervals on average to recover the low-pH seawater and drive off the CO2 in the seawater, and the aeration fan transports the air used for the oxidation of the aeration tank. The aeration fan outlet is divided into five glass fiber aeration pipes, and each pipe sends the fresh air sent by the aeration fan into a total of 38 aeration grids into the five seawater intervals of the aeration tank. The seawater desulfurization control system, the control system consists of flue gas seawater desulphurization (FGD) using the ABB Procontro-lP control system.
The system is connected to the host system's DAS (data acquisition system), SCS (sequence control system), CCS (coordinated control system) and BMS (burner management system) via a Remote-bus network on a single network, fully embodying the unit DCS ( Decentralized control system) integrated features. Some important signals such as MFT (main fuel trip), load, air preheater temperature, etc. are still connected to the host system through hard wiring. As a functional group of the unit DCS system, FGD has more than 340 input/output (I/O) points, which are divided into 7 sub-function groups: FGD program control, booster fan program control, and booster fan operation. Leaf control, flue gas-smoke heat exchanger (GGH) program control, seawater booster pump program control, aeration fan program control and FGD electrical equipment data acquisition.
The basic function of the control system is to protect the host system and the FGD itself. The system is designed with an emergency trip (ESD-1) and a secondary emergency trip (ESD-2). The first-level emergency trip (ESD-1) only jumps to the flue gas side equipment, does not jump to the sea side equipment; the second level emergency trip (ESD-2) flies the gas side equipment, and also jumps to the sea side equipment. The first-level emergency trip conditions are: FGD inlet temperature is higher than 155e, absorption tower inlet temperature is higher than 115e, booster fan trips, GGH trip, electric dust removal trip, booster fan inlet baffle closure and baffle control unit pressure is low. The secondary emergency trip conditions are: the water level of the seawater absorption pump sink is low, the seawater flow rate of the absorption tower is low, the water level of the absorption tower bottom sea pool is high, and the boiler MFT.5 seawater desulphurization operation is introduced for half a year, regardless of the assessment condition. Under the condition of calibration, the performance indexes of the FGD system meet the national standards, meet or exceed the design value, and the total SO2 emission rate is in the leading position in the world. Relevant data when the National Environmental Protection Agency accepted the FGD system.
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