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CN-121225803-B - Wastewater treatment system for coal-biomass coupling power generation system

CN121225803BCN 121225803 BCN121225803 BCN 121225803BCN-121225803-B

Abstract

The invention relates to the field of sewage treatment, and discloses a wastewater treatment system for a coal-biomass coupling power generation system, which comprises a pretreatment tank, an anaerobic tank, an aerobic tank and an MBR membrane treatment tank, wherein an oil removal assembly is arranged in the pretreatment tank, the oil removal assembly comprises a quantization cylinder arranged in the pretreatment tank, a liquid outlet pipe is arranged on the quantization cylinder, a cleaning piston is arranged in the quantization cylinder, an adjusting mechanism for driving the cleaning piston to move up and down is arranged at the bottom of the cleaning piston, a COD (chemical oxygen demand) sensor, a PH (potential of Hydrogen) sensor, a temperature sensor and a liquid level sensor are arranged in the quantization cylinder, an oil removal assembly is also arranged in the pretreatment tank, the oil removal assembly comprises a scraper horizontally arranged in the pretreatment tank, and a collecting tank oil removal assembly is arranged on one side of the quantization cylinder and further comprises a control structure for controlling the horizontal movement of the scraper. The invention has simple structure, can perform corresponding pretreatment according to the water quantity of each batch of condensed water, and ensures that all indexes of water entering an anaerobic tank are kept balanced.

Inventors

  • QIAN JUN
  • YANG CONGSEN
  • REN MINGYONG

Assignees

  • 湖北昌能生物质发电有限公司

Dates

Publication Date
20260508
Application Date
20251022

Claims (8)

  1. 1. The wastewater treatment system for the coal-biomass coupling power generation system is characterized by comprising a pretreatment tank (1), an anaerobic tank (2), an aerobic tank (3) and an MBR membrane treatment tank (4); A water inlet pipe (1 a) is arranged on the pretreatment tank (1), a quantification cylinder (5) is arranged in the pretreatment tank (1), a liquid outlet pipe (5 a) is arranged on the quantification cylinder (5), a cleaning piston (5 b) is arranged in the quantification cylinder (5), an adjusting mechanism for driving the cleaning piston (5 b) to move up and down is arranged at the bottom of the cleaning piston (5 b), a COD (chemical oxygen demand) sensor, a PH (potential of hydrogen) sensor, a temperature sensor and a liquid level sensor are arranged in the quantification cylinder (5), an oil removing component (6) is further arranged in the pretreatment tank (1), the oil removing component (6) further comprises a scraper (6 a) horizontally arranged in the pretreatment tank (1), a collecting groove (6 b) is arranged on one side of the quantification cylinder (5), the bottom of the collecting groove (6 b) is obliquely arranged, one end of the collecting groove (6 b) is communicated with the oil outlet (1 b), and the oil removing component (6 a) is further controlled by the control mechanism (7); The cleaning piston (5 b) is arranged to move in the quantifying cylinder (5), the water storage capacity of the quantifying cylinder (5) is adjusted, the liquid level of condensed water in each batch is guaranteed to be flush with the top opening of the quantifying cylinder (5), insoluble grease in the condensed water is scraped by the scraper (6 a), and after the condensed water is discharged, grease on the inner wall of the quantifying cylinder (5) can be cleaned by the cleaning piston (5 b); A dosing mechanism (8) for adding a medicament is also arranged in the pretreatment tank (1); a plurality of stirrers (2 a) are arranged in the anaerobic tank (2); a plurality of aeration discs (3 a) are arranged in the aerobic tank (3); A plurality of MBR plate-type membranes (4 a) are arranged in the MBR membrane treatment tank (4).
  2. 2. The wastewater treatment system for a coal-biomass coupled power generation system according to claim 1, wherein a rubber scraper is provided on a side of the top of the collecting tank (6 b) away from the quantifying cylinder (5).
  3. 3. The wastewater treatment system for the coal-biomass coupled power generation system according to claim 1, wherein the control mechanism (7) comprises a control screw rod (7 a) horizontally arranged in the pretreatment tank (1), one end of the control screw rod (7 a) is provided with a control motor (7 b), and the scraper (6 a) is provided with a threaded hole matched with the control screw rod (7 a).
  4. 4. The wastewater treatment system for the coal-biomass coupled power generation system of claim 1, wherein the adjusting mechanism comprises an electric push rod (9) arranged at the bottom of the cleaning piston (5 b).
  5. 5. The wastewater treatment system for the coal-biomass coupled power generation system of claim 1, wherein the dosing mechanism (8) comprises a plurality of dosing boxes (8 a), dosing pipes (8 b) are arranged on the dosing boxes (8 a), mixing grooves (5 c) are arranged on the outer wall of the quantifying cylinder (5), and the mixing grooves (5 c) are located right below the liquid outlet pipes (5 a).
  6. 6. The wastewater treatment system for the coal-biomass coupled power generation system of claim 1, wherein a nitrifying liquid return pipe (4 b) is arranged in the MBR membrane treatment tank (4), one end of the nitrifying liquid return pipe (4 b) is communicated with the MBR membrane treatment tank (4), and the other end of the nitrifying liquid return pipe is communicated with the anaerobic tank (2).
  7. 7. The wastewater treatment system for a coal-biomass coupled power generation system according to claim 1, wherein two of the collection tanks (6 b) are provided, and the two collection tanks (6 b) are located on both sides of the quantization cylinder (5).
  8. 8. The wastewater treatment system for the coal-biomass coupled power generation system according to claim 1, wherein a heat exchange coil (10) is further arranged in the pretreatment tank (1), and the heat exchange coil (10) is attached to the outer wall of the quantification cylinder (5).

Description

Wastewater treatment system for coal-biomass coupling power generation system Technical Field The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment system for a coal-biomass coupling power generation system. Background The coal-biomass coupling power generation is a technology combining traditional coal power generation with biomass energy utilization, and the energy efficient utilization is realized by introducing biomass fuel (such as straw, rice husk, forestry waste and the like) into the existing coal-fired power generation unit. The biomass gasification device has various coupling modes, namely direct coupling, namely direct crushing of biomass and mixed combustion of the biomass and coal in a boiler, indirect coupling, namely gasification treatment of the biomass in a special gasification furnace to convert the biomass into combustible gas, and then introduction of the combustible gas into a coal-fired boiler to participate in combustion power generation. In the coal-biomass coupling power generation system, a sludge coupling technology is generally added, namely a technology for mixing and burning sludge and coal in a coal-fired boiler to realize harmless treatment and energy utilization of the sludge, so that the sludge treatment problem can be solved, and the heat value of the sludge can be utilized to generate electric energy, thereby having remarkable environmental and economic benefits. In order to reduce the influence of sludge co-combustion on boiler equipment and process, the sludge needs to be dried before entering the boiler to ensure that the water content is lower than 40%. The current state of sludge adopts more disc drying technology, adopts the disc to drive rotatory propelling movement, utilizes saturated steam indirect heating mode to dry sludge, and the waste gas that produces in the desiccation process gets into the heat exchanger cooling and makes the temperature reduce, forms condensation waste water with vapor condensation, and condensation waste water phase is compared in general sewage, has just reduced insoluble pollutant, and the concentration of soluble pollutant is higher on the contrary, is concentrated waste water, can't direct discharge, needs to carry out condensation waste water innocent treatment. Because the sludge drying generally adopts vertical disc sludge drying, the water outlet mode is intermittent water outlet, the types of the sludge are various, the fluctuation of the condensate water quantity and the content of soluble pollutants generated by drying is large, when the content of certain pollutants is too high, the biochemical treatment cannot be directly carried out, pretreatment is needed, and when the kitchen garbage sludge and the industrial sludge are dried, grease enters the condensate water along with water vapor, so that the follow-up sewage treatment is easily influenced by the grease. The invention patent with publication number of CN111559831A discloses a full-flow treatment system and method for sludge coupling power generation drying wastewater, which can effectively reduce treatment load, reduce treatment cost, ensure good effluent quality and can effectively recycle and supplement water in a circulating way through a full-flow system of separation unit, classification and quality treatment, but can only treat condensed wastewater in a large quantity, and can not carry out targeted treatment when the quality of the condensed wastewater fluctuates greatly. Disclosure of Invention The invention aims to provide a wastewater treatment system for a coal-biomass coupled power generation system, and aims to solve the problems of difficult removal of condensed wastewater grease, large fluctuation of pollutant parameters and unstable water yield in the prior art. The technical aim of the invention is realized by the following technical scheme that the wastewater treatment system for the coal-biomass coupling power generation system comprises a pretreatment tank, an anaerobic tank, an aerobic tank and an MBR membrane treatment tank; The pretreatment tank is internally provided with a water inlet pipe, a quantification cylinder is arranged in the pretreatment tank, a cleaning piston is arranged in the quantification cylinder, the bottom of the cleaning piston is provided with an adjusting mechanism for driving the cleaning piston to move up and down, the quantification cylinder is internally provided with a COD sensor, a PH sensor, a temperature sensor and a liquid level sensor, the pretreatment tank is internally further provided with an oil removal component, the oil removal component comprises a scraper blade horizontally arranged in the pretreatment tank, one side of the quantification cylinder is provided with a collecting tank, the bottom of the collecting tank is lower than the top of the quantification cylinder, the top of the collecting tank is higher than the bottom of the scraper blade, t