A wet desulfurization wastewater treatment system for a waste incineration power plant

Abstract

The utility model belongs to the field of wet desulphurization wastewater treatment, disclose a kind of for garbage incineration power plant wet desulphurization wastewater treatment system, including heat exchanger, wash smoke wastewater pool, coagulation tank, plate-and-frame filter press, filter liquor collection pool, DTRO regulating tank, quartz sand filter, raw water tank, DTRO equipment, DTRO concentrated water tank and to degassing tower+water storage tank, heat exchanger connects wash smoke wastewater pool, wash smoke wastewater pool connects coagulation tank, coagulation tank connects plate-and-frame filter press, plate-and-frame filter press connects filter liquor collection pool, filter liquor collection pool connects DTRO regulating tank, DTRO regulating tank connects quartz sand filter, quartz sand filter connects raw water tank, raw water tank connects DTRO equipment, DTRO equipment connects DTRO concentrated water tank and to degassing tower+water storage tank.The utility model can directly carry out multiple equipment combination treatment after cooling by heat exchanger, so that water production reaches discharge standard, and processing efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of wet desulfurization wastewater treatment, and in particular relates to a wet desulfurization wastewater treatment system for waste incineration power plants. Background Technology

[0002] Thermal power plants are major industrial water consumers in my country. With increasing water scarcity, water conservation and pollution reduction in thermal power plants are imperative. Conventional semi-dry / dry desulfurization processes can no longer meet the requirements of waste-to-energy incineration plants. Wet desulfurization processes have the advantage of high desulfurization efficiency, but they generate desulfurization wastewater during operation. Direct discharge of this wastewater can cause secondary pollution, and it is generally required to treat it before reuse. The flue gas produced by waste-to-energy incineration plants usually needs to undergo desulfurization and denitrification treatment. In the wet desulfurization process unit, lime water or certain chemical agents need to be added in the wet scrubbing tower to promote reaction and absorption.

[0003] Desulfurization wastewater has a complex composition, high heavy metal content, high hardness, high turbidity and high salt content, high temperature, and is acidic or alkaline. It contains COD and other components, making it extremely easy to form scale and difficult to treat.

[0004] Traditional processes involve evaporating, concentrating, and solidifying desulfurization wastewater, recovering the condensate generated during evaporation, and simultaneously converting the wastewater into solid salts for off-site transport, achieving near-zero wastewater discharge while also reusing the wastewater. However, this process has high investment and operating costs, and the system is quite complex, making it difficult to promote. Utility Model Content

[0005] The purpose of this invention is to provide a wet desulfurization wastewater treatment system for waste incineration power plants to solve the aforementioned technical problems.

[0006] To achieve the above objectives, the specific technical solution of this utility model for a wet desulfurization wastewater treatment system for waste incineration power plants is as follows:

[0007] A wet desulfurization wastewater treatment system for waste incineration power plants includes a heat exchanger, a flue gas washing wastewater tank, a coagulation tank, a plate and frame filter press, a filtrate collection tank, a DTRO regulating tank, a quartz sand filter, a raw water tank, a DTRO unit, a DTRO concentrate tank, and a degassing tower + purified water storage tank. The heat exchanger is connected to the flue gas washing wastewater tank, which is connected to the coagulation tank. The coagulation tank is connected to the plate and frame filter press, which is connected to the filtrate collection tank. The filtrate collection tank is connected to the DTRO regulating tank, which is connected to the quartz sand filter. The quartz sand filter is connected to the raw water tank, which is connected to the DTRO unit. The DTRO unit is connected to the DTRO concentrate tank and the degassing tower + purified water storage tank. The heat exchanger is used to cool the incoming scrubbing water from the scrubbing tower. The scrubbing wastewater tank is used to store the cooled scrubbing water. The coagulation tank is used to add chemicals to the scrubbing water for coagulation and stirring. The plate and frame filter press is used to filter sludge to form a filter cake. The filtrate collection tank is used to collect the filtrate output from the plate and frame filter press. The DTRO conditioning tank is used to add chemicals to the filtrate for conditioning. The quartz sand filter is used to perform preliminary filtration on the filtrate after chemical conditioning. The raw water tank is used to collect the filtered water. The DTRO equipment is used to perform high-pressure concentration treatment on the filtered water. The DTRO concentrate tank is used to collect the concentrate output from the DTRO equipment. The degassing tower + purified water storage tank is used to collect the water output from the DTRO equipment.

[0008] Furthermore, the wastewater tank for washing flue gas is connected to a self-priming pump, which transports the wastewater from the washing flue gas tank to the coagulation tank.

[0009] Furthermore, the coagulation tanks comprise three, each with a capacity of 30 tons.

[0010] Furthermore, the coagulation tank is connected to an alkali tank, which is connected to an alkali tanker truck. The alkali tanker truck pumps alkali solution into the alkali tank via an alkali unloading pump. The alkali tank pumps alkali solution into each coagulation tank via a dosing pump. The coagulation tank is equipped with a mixer for mixing the materials inside. The liquid outlet at the bottom of the coagulation tank is connected to a plate and frame filter press via a screw pump.

[0011] Furthermore, the raw water output from the filtrate collection tank is fed into the DTRO regulating tank via a raw water booster pump.

[0012] Furthermore, the DTRO regulating tank is connected to an acid addition tank, which is connected to an acid tanker truck. The acid tanker truck inputs acid into the acid addition tank, and the acid addition tank is connected to an acid circulation pump via an acid metering pump. The acid circulation pump adds acid to the DTRO regulating tank.

[0013] Furthermore, the input end of the raw water tank is connected to the scale inhibitor tank, the input of the scale inhibitor tank is connected to tap water, and the scale inhibitor tank outputs scale inhibitor to the raw water tank through a scale inhibitor / reducing agent metering pump.

[0014] Furthermore, the raw water tank is fed into the two DTRO modules of the DTRO equipment by two raw water pumps. A portion of the concentrate and product from the DTRO equipment enters the cleaning water tank, which outputs cleaning water to circulate and clean the DTRO modules and the quartz sand filter.

[0015] Furthermore, another portion of the DTRO concentrate from the DTRO equipment is transported to a DTRO concentrate tank for storage, while another portion of the DTRO permeate is transported to a degassing tower + purified water storage tank via a degassing tower blower for storage. The permeate from the degassing tower + purified water storage tank is discharged via a clean water discharge pump.

[0016] Furthermore, the degassing tower blower is connected to an alkali tank, the alkali tank is connected to a tap water supply, and the alkali tank outputs alkali solution to the degassing tower blower through an alkali metering pump.

[0017] The wet desulfurization wastewater treatment system for waste incineration power plants according to this invention has the following advantages:

[0018] 1. The wet desulfurization wastewater treatment system for waste incineration power plants of this utility model does not require biochemical treatment of the flue gas. It can be directly treated after passing through a series of cooling processes such as heat exchangers.

[0019] 2. This system addresses the problem of poor flue gas quality, including high levels of heavy metals, hardness, turbidity, and salinity, by combining multiple devices to treat the wastewater and ensure that the produced water meets discharge standards.

[0020] 3. This system does not require evaporation and curing equipment, which reduces initial investment and subsequent operation and maintenance costs, and improves processing efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the wet desulfurization wastewater treatment system for waste incineration power plants according to this utility model;

[0022] Figure 2 This is a schematic diagram of the DTRO pretreatment PID of this utility model;

[0023] Figure 3 This is a schematic diagram of the DTRO processing PID of this utility model; Detailed Implementation

[0024] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a wet desulfurization wastewater treatment system for waste incineration power plants.

[0025] The alkaline water from the alkaline water tank is cooled by the alkaline water circulation pump through a heat exchanger and then sprayed downwards through the nozzle above the alkaline water absorption section. It is evenly distributed through the packing bed and fully contacts the flue gas. When the air flows through the scrubbing tower, pollutants in the air (such as harmful gases and smoke) are adsorbed into the water. Water molecules adsorb these pollutants and cause them to precipitate in the water, producing flue gas scrubbing water.

[0026] like Figure 1 As shown, this utility model discloses a wet desulfurization wastewater treatment system for waste incineration power plants, comprising a heat exchanger, a flue gas washing wastewater tank, a coagulation tank, a plate and frame filter press, a filtrate collection tank, a DTRO regulating tank, a quartz sand filter, a raw water tank, a DTRO device, a DTRO concentrate tank, and a degassing tower + purified water storage tank. The heat exchanger is connected to the flue gas washing wastewater tank, which is connected to the coagulation tank. The coagulation tank is connected to the plate and frame filter press, which is connected to the filtrate collection tank. The filtrate collection tank is connected to the DTRO regulating tank, which is connected to the quartz sand filter. The quartz sand filter is connected to the raw water tank, which is connected to the DTRO device. The DTRO device is connected to the DTRO concentrate tank and the degassing tower + purified water storage tank. The heat exchanger is used to cool the incoming scrubbing water from the scrubbing tower; the scrubbing wastewater tank is used to store the cooled scrubbing water; the coagulation tank is used to add chemicals to the scrubbing water for coagulation and stirring; the plate and frame filter press is used to filter sludge to form a filter cake; the filtrate collection tank is used to collect the filtrate output from the plate and frame filter press; the DTRO conditioning tank is used to add chemicals to the filtrate for conditioning; the quartz sand filter is used to perform preliminary filtration on the filtrate after chemical conditioning; the raw water tank is used to collect the filtered water; the DTRO equipment is used to perform high-pressure concentration treatment on the filtered water; the DTRO concentrate tank is used to collect the concentrate output from the DTRO equipment; and the degassing tower + purified water storage tank is used to collect the water output from the DTRO equipment.

[0027] After being cooled by a heat exchanger, the flue gas from the scrubbing tower undergoes DTRO pretreatment, such as... Figure 2 As shown, the cooled flue gas washing water is discharged into the flue gas washing wastewater tank, which is connected to a self-priming pump. The self-priming pump transports the flue gas washing water to the coagulation tanks. There are three coagulation tanks, each with a capacity of 30 tons. Each coagulation tank is connected to an alkali tank, which is connected to an alkali tanker truck. The alkali tanker truck uses an alkali unloading pump to input alkali into the alkali tank, and the alkali tank uses a dosing pump to input alkali into each coagulation tank. The coagulation tank is equipped with a mixer to mix the materials inside. The liquid effluent from the bottom of the coagulation tank is connected to a plate and frame filter press via a screw pump. After the plate and frame filter press compresses the material, the waste residue enters the power plant for incineration, and the filtrate enters the filtrate collection tank. The filtrate collection tank uses a clear liquid lift pump to send part of it to the power plant for reuse and part of it to the DTRO equalization tank. This completes the DTRO pretreatment.

[0028] Next, perform DTRO processing: such as Figure 3 As shown, the raw water output from the filtrate collection tank is pumped into the DTRO equalization tank via a raw water booster pump. The DTRO equalization tank is connected to an acid tanker, which in turn is connected to an acid tanker truck. The acid tanker truck pumps acid into the acid tanker, which is then connected to an acid circulation pump via an acid metering pump. The circulation pump adds acid to the DTRO equalization tank to adjust the acidity of the raw water. The output from the DTRO equalization tank is sent to a quartz sand filter. After preliminary filtration, the water enters the raw water tank for storage. The raw water tank is connected to a scale inhibitor tank, which is connected to tap water. The scale inhibitor tank pumps scale inhibitor / reducing agent metering pumps to the raw water tank. The raw water from the tank is pumped into the two DTRO modules of the DTRO equipment via two separate raw water pumps for high-pressure concentration. A portion of the concentrate and product from the DTRO equipment enters a cleaning water tank for cleaning. The cleaning water is then used to circulate and clean the DTRO modules and the quartz sand filter. Another portion of the DTRO concentrate is transported to the DTRO concentrate tank for storage, while another portion of the DTRO permeate is transported to the degassing tower + purified water storage tank via the degassing tower blower. The degassing tower blower input is connected to the alkali tank, which in turn is connected to the tap water supply. The alkali tank outputs alkali solution to the degassing tower blower via an alkali metering pump. The permeate from the degassing tower + purified water storage tank is discharged via a clean water discharge pump, which can be reused or discharged for treatment.

[0029] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A waste incineration power plant wet desulfurization wastewater treatment system, characterized by, The system includes a heat exchanger, a flue gas washing wastewater tank, a coagulation tank, a plate and frame filter press, a filtrate collection tank, a DTRO equalization tank, a quartz sand filter, a raw water tank, a DTRO unit, a DTRO concentrate tank, and a degassing tower + purified water storage tank. The heat exchanger is connected to the flue gas washing wastewater tank, which is connected to the coagulation tank. The coagulation tank is connected to the plate and frame filter press, which is connected to the filtrate collection tank. The filtrate collection tank is connected to the DTRO equalization tank, which is connected to the quartz sand filter. The quartz sand filter is connected to the raw water tank, which is connected to the DTRO unit. The DTRO unit is connected to the DTRO concentrate tank and the degassing tower + purified water storage tank. The heat exchanger is used to regulate the input... The scrubbing tower cools the flue gas, the flue gas wastewater tank stores the cooled flue gas, the coagulation tank adds chemicals to the flue gas for coagulation and stirring, the plate and frame filter press filters sludge to form a filter cake, the filtrate collection tank collects the filtrate output from the plate and frame filter press, the DTRO conditioning tank adds chemicals to the filtrate for conditioning, the quartz sand filter performs preliminary filtration on the filtrate after chemical conditioning, the raw water tank collects the filtered water, the DTRO equipment performs high-pressure concentration treatment on the filtered water, the DTRO concentrate tank collects the concentrate output from the DTRO equipment, and the degassing tower + purified water storage tank collects the water output from the DTRO equipment.

2. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 1, characterized by, The wastewater tank for washing the flue gas is connected to a self-priming pump, which transports the washing water to the coagulation tank.

3. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 1, characterized by, The coagulation tanks comprise three, each with a capacity of 30 tons.

4. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 1, characterized by, The coagulation tank is connected to an alkali tank, which is connected to an alkali tanker truck. The alkali tanker truck pumps alkali into the alkali tank via an alkali unloading pump. The alkali tank pumps alkali into each coagulation tank via a dosing pump. The coagulation tank is equipped with a mixer for mixing the materials inside. The liquid outlet at the bottom of the coagulation tank is connected to a plate and frame filter press via a screw pump.

5. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 1, characterized by, The raw water output from the filtrate collection tank is fed into the DTRO regulating tank via a raw water booster pump.

6. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 1, characterized by, The DTRO regulating tank is connected to an acid addition tank, which is connected to an acid tanker truck. The acid tanker truck inputs acid into the acid addition tank. The acid addition tank is connected to an acid circulation pump via an acid metering pump. The acid circulation pump adds acid to the DTRO regulating tank.

7. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 1, characterized by, The raw water tank input is connected to the scale inhibitor tank, the scale inhibitor tank input is connected to tap water, and the scale inhibitor tank outputs scale inhibitor to the raw water tank through a scale inhibitor / reducing agent metering pump.

8. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 1, characterized by, The raw water tank supplies water to the two DTRO modules of the DTRO equipment via two raw water pumps. A portion of the concentrate and product from the DTRO equipment enters the cleaning water tank, which outputs cleaning water to circulate and clean the DTRO modules and the quartz sand filter.

9. The wet desulfurization wastewater treatment system for waste incineration power plants according to claim 1, characterized by, Another portion of the DTRO concentrate from the DTRO equipment is transported to a DTRO concentrate tank for storage, while another portion of the DTRO permeate is transported by a degassing tower blower to a degassing tower + purified water storage tank for storage. The permeate from the degassing tower + purified water storage tank is discharged through a clean water discharge pump.

10. The wet desulfurization wastewater treatment system for a waste incineration power plant according to claim 9, characterized by, The degassing tower fan is connected with an alkali tank, the alkali tank is connected with tap water, and the alkali tank outputs alkali solution to the degassing tower fan through an alkali metering pump.

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