Household garbage incineration fly ash pickling device

Abstract

The utility model discloses a household garbage incineration fly ash pickling device which is characterized in that a gas outlet is formed in a pickling tank, and a filter screen is arranged at the gas outlet; the gas collecting tank comprises a liquid sealing device, a gas outlet is formed in the top of the liquid sealing device, a gas inlet, a water replenishing port and an acid outlet are formed in the side wall of the liquid sealing device, and the gas inlet is communicated with the gas discharging port through a pipeline. The air outlet with the filter screen is formed in the pickling tank, so that dust is effectively prevented from entering a subsequent air collection device, and pipeline blockage is avoided; and meanwhile, a liquid seal device in the gas collecting tank is sealed by liquid, so that gas generated in the pickling process cannot escape into workshop air, the collected gas is safely guided out in cooperation with a gas discharging opening, and the whole device achieves the safe and environment-friendly treatment effect while guaranteeing the clean workshop environment and maintaining the normal operation of equipment.

Description

Technical Field

[0001] This utility model relates to the field of fly ash treatment technology, and in particular to an acid washing device for fly ash from municipal solid waste incineration. Background Technology

[0002] Municipal solid waste incineration fly ash (hereinafter referred to as "fly ash") is fine particulate matter obtained from the flue gas collection system of waste-to-energy plants. Fly ash contains a large amount of soluble chloride salts, high levels of heavy metals, and trace amounts of highly toxic dioxins, and is therefore classified as hazardous waste (HW18).

[0003] Fly ash washing is an effective dechlorination method. Currently, fly ash washing agitation equipment is relatively mature. Beijing Zhongke Guorun Environmental Protection Technology Co., Ltd. proposed a fly ash washing device (204848668U) that features "uniform mixing, minimal adhesion, and good washing effect." Shanghai Electric Group Co., Ltd. proposed "A Fly Ash Washing Dechlorination Equipment" (209338408U), further improving the fly ash washing dechlorination equipment by addressing issues such as solid phase deposition at the bottom of the fly ash washing process and the potential for solid accumulation dead zones caused by the baffle wall arrangement.

[0004] Pickling is a crucial technique for achieving deep dechlorination and enhanced heavy metal removal from fly ash. Pickling should prioritize equipment corrosion prevention and environmental safety, but currently, there is limited equipment specifically designed for fly ash pickling. During pickling, the fly ash should react fully with the acid solution to maximize heavy metal leaching efficiency. Furthermore, the reaction between the acid solution and carbonates and bicarbonates in the fly ash produces gases such as CO2 and H2O. Combined with the exothermic pickling reaction, these acidic gases easily volatilize into the air, polluting the workshop environment. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a pickling device for fly ash from municipal solid waste incineration that has good pickling effect, is safe and environmentally friendly.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a municipal solid waste incineration fly ash acid washing device, comprising an acid washing tank and a gas collecting tank: the acid washing tank is provided with a vent, and a filter screen is provided at the vent; the gas collecting tank includes a liquid sealer, the top of the liquid sealer is provided with a gas outlet, and the side wall is provided with a gas inlet, a water inlet and an acid outlet, the gas inlet is connected to the vent via a pipeline, and the water inlet is located above the acid outlet.

[0007] In one embodiment of the present invention, the pickling tank includes a main body and a cover. The main body is composed of a cylindrical tank body and a conical tank bottom. The top of the tank body is fitted with a cover, which has a liquid inlet, a feed inlet and a vent.

[0008] In one embodiment of this utility model, a variable frequency motor is installed on the cover, the shaft end of the variable frequency motor is coaxially fixed with the stirrer, the stirring blades of the stirrer extend into the tank, and a baffle is provided on the inner side wall of the tank.

[0009] In one embodiment of the present invention, the bottom of the tank is provided with a discharge port and an inspection port, and a flow valve is provided on the discharge port.

[0010] In one embodiment of this utility model, a liquid dispensing pump and a three-way solenoid valve are connected in sequence at the liquid inlet to connect the water tank and the acid tank.

[0011] In one embodiment of the present invention, a vacuum pump with a one-way control valve is provided on the pipeline connecting the vent and the inlet, and an outlet pipe is connected to the inlet, the bottom end of which extends to the bottom of the liquid sealer.

[0012] In one embodiment of this utility model, both the pickling tank and the gas collecting tank are made of stainless steel, and the inner walls of both the pickling tank and the gas collecting tank are covered with an anti-corrosion lining. The pipeline is made of acid-resistant plastic.

[0013] In one embodiment of this utility model, a control valve is provided at the acid outlet, and a pH meter is provided inside the gas collecting tank. The control valve and the pH meter are connected by a signal.

[0014] As described above, the acid washing device for fly ash from municipal solid waste incineration of this utility model has the following beneficial effects: the filter screen installed at the vent of the acid washing tank can effectively intercept dust particles generated during the acid washing process, preventing them from entering the gas collection tank pipeline system with the gas. At the same time, the liquid seal device of the acid washing tank and the gas collection tank are connected through the pipeline to form a closed gas collection system. The liquid medium of the liquid seal device effectively absorbs acidic gas, and the liquid seal structure forms a physical isolation barrier, providing double protection against harmful gases escaping into the workshop air. The entire device forms a closed-loop system of "filtration and interception - liquid seal absorption - pump discharge control", which not only meets the requirements of hazardous waste treatment regulations, but also achieves dual protection of the production environment and personnel safety through multiple protective measures, which is in line with the environmental protection concept of green chemical industry. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1A schematic diagram of the structure of the acid washing device for fly ash from municipal solid waste incineration provided by this utility model;

[0017] Figure 2 A top view of the acid washing tank of the municipal solid waste incineration fly ash acid washing device provided by this utility model.

[0018] Component designation explanation

[0019] 1. Pickling tank; 2. Gas collection tank; 3. Vent; 4. Filter screen; 5. Liquid sealer; 6. Gas outlet; 7. Gas inlet; 8. Water inlet; 9. Acid outlet; 10. Piping; 11. Cover; 12. Tank body; 13. Tank bottom; 14. Liquid inlet; 15. Feed inlet; 16. Variable frequency motor; 17. Agitator; 18. Agitator paddle; 19. Baffle plate; 20. Discharge outlet; 21. Inspection port; 22. Flow valve; 23. Liquid mixing pump; 24. Three-way solenoid valve; 25. Vacuum pump; 26. Gas outlet pipe; 27. Control valve; 28. pH meter; 29. ​​Pressure sensor. Detailed Implementation

[0020] This utility model provides an acid washing device for fly ash from municipal solid waste incineration. To make the purpose, technical solution and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments.

[0021] In the description of this utility model, it should be understood that the terms "up, down, left, right" and other indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and should not be construed as limiting this utility model; in addition, the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Please see Figure 1 and Figure 2 This utility model provides a fly ash acid washing device for municipal solid waste incineration, including an acid washing tank 1 and a gas collecting tank 2: the acid washing tank 1 is provided with a vent 3 and a filter screen 4 is provided at the vent 3; the gas collecting tank 2 includes a liquid sealer 5, the top of the liquid sealer 5 is provided with a gas outlet 6, and the side wall is provided with a gas inlet 7, a water inlet 8 and an acid outlet 9. The gas inlet 7 is connected to the vent 3 via a pipeline 10, and the water inlet 8 is located above the acid outlet 9.

[0023] The pickling tank 1 includes a main body and a cover 11. The main body consists of a cylindrical tank body 12 and a conical tank bottom 13. The cover 11 is installed on the top of the tank body 12. The cover 11 has a liquid inlet 14, a feed inlet 15, and a vent 3. It is understood that the cylindrical tank body 12 provides ample reaction space, and the conical tank bottom 13 facilitates material accumulation and discharge, making subsequent venting and discharge operations easier, thus improving the efficiency of the pickling process and the convenience of material handling. The cover 11 integrates the liquid inlet 14, the feed inlet 15, and the vent 3, achieving a sealed operation and reducing the risk of acid mist escape. The conical tank bottom 13 is provided with a discharge port 20 and an inspection port 21. In this embodiment, the discharge port 20 is located at the bottom of the tank bottom 13, and the inspection port 21 is located on the side wall of the tank bottom 13. A flow valve 22 is provided on the discharge port 20. That is, the flow valve 22 can accurately control the discharge rate of waste liquid and reaction products. At the same time, the inspection port is provided around the discharge port 20 to facilitate timely inspection and unblocking of the discharge port 20 at the bottom of the tank bottom 13, so as to avoid material blockage or leakage, and at the same time facilitate the cleaning and maintenance of the tank body 12.

[0024] A pressure gauge and a pressure sensor 29 are installed on the cover 11. The probes of the pressure gauge and the pressure sensor 29 extend into the tank body 12 of the pickling tank 1 to detect the pressure value inside the tank body 12. When the pressure value inside the tank body 12 reaches a predetermined value, the venting operation is initiated based on the signal from the pressure gauge and the pressure sensor 29. Specifically, by controlling the valve at the vent port 3 on the tank body 12 to open, the high-pressure gas or steam inside the tank body 12 is rapidly discharged with the assistance of the air pump 25, thereby reducing the pressure inside the tank body 12. During the venting process, the valve opening is adjusted according to the difference between the actual pressure and the predetermined value.

[0025] In this embodiment, a variable frequency motor 16 is installed on the cover 11. The shaft end of the variable frequency motor 16 is coaxially fixed with the stirrer 17. The stirring paddle 18 of the stirrer 17 extends into the tank 12. A baffle 19 is provided on the inner wall of the tank 12. The stirrer 17 is driven by the variable frequency motor 16. By adjusting the speed, it can adapt to the needs of different reaction stages and reduce energy consumption. In actual operation, when the reaction is in the initial stage, the required stirring force is relatively small. At this time, the speed of the variable frequency motor 16 can be reduced to achieve energy saving. As the reaction proceeds, when it is necessary to strengthen the stirring effect, the speed of the variable frequency motor 16 can be appropriately increased. Preferably, there are 4-6 baffles 19. Multiple baffles 19 are evenly arranged on the inner wall of the tank 12. In the vortex formed by the stirring paddle 18, the baffles 19 can break the fluid vortex in the tank 12, improve the contact efficiency between fly ash and acid, and shorten the reaction time. Optionally, two adjacent wall baffles 19 may have different extension heights, which can further improve the contact efficiency between fly ash and acid.

[0026] An intelligent liquid dispensing device is integrated at the liquid inlet 14 of the cap 11, consisting of a dispensing pump 23 and a three-way solenoid valve 24 forming a precision linkage system. The dispensing pump 23 adopts a high-precision metering pump body structure and is equipped with a servo motor drive system with high flow accuracy. The flow range can be preset via a PLC controller. The three-way solenoid valve 24 is made of 316L stainless steel and integrates a double-seat sealing structure. It is equipped with a magnetic position sensor, which can quickly switch the liquid transfer mode. During system operation, the pressure sensor monitors the pressure value of the dispensing pipeline in real time. When the liquid level in the acid tank is detected to be lower than the set threshold, the PLC automatically switches the three-way valve to the water replenishment channel. The dispensing pump dynamically adjusts the water replenishment volume according to the preset acid concentration ratio through a PID algorithm to ensure that the conductivity of the mixed liquid is controlled within the predetermined deviation range, ensuring the stability of the acid concentration and avoiding the risk of human operation error and acid mixing.

[0027] A vacuum pump 25 with a one-way control valve is installed on the pipeline 10 connecting the vent 3 and the inlet 7. An outlet pipe 26 is connected to the inlet 7, with its bottom end extending to the bottom of the liquid sealer 5. The vacuum pump 25 enhances the gas delivery power, and the one-way control valve prevents gas backflow. The outlet pipe 26 extends to the bottom of the liquid sealer 5, prolonging the contact time between the gas and the liquid seal medium and improving the acid gas absorption rate. After the acid washing reaction in the acid washing tank 1 is completed, the vacuum pump 25 starts working and extracts the residual reaction gas in the pipeline 10, improving the gas collection efficiency.

[0028] In this embodiment, a control valve 27 is installed at the acid outlet 9, and a pH meter 28 is installed inside the gas collecting tank 2. The control valve 27 and the pH meter 28 are connected by a signal. The pH meter 28 monitors the waste acid concentration in real time, and the signal triggers the control valve 27 to adjust the discharge rate, ensuring maximum liquid seal absorption efficiency while avoiding the risk of secondary pollution caused by excessive waste acid discharge. In practical applications, when the pH meter 28 detects that the waste acid concentration reaches a set threshold, it automatically sends a signal to the control valve 27, which then adjusts its opening to precisely control the discharge rate of waste acid. This not only improves the system's operating efficiency but also significantly reduces environmental pollution. Throughout the process, all components work together to ensure the stable and efficient operation of the system.

[0029] Both the pickling tank 1 and the gas collecting tank 2 are integrally cast from 316L austenitic stainless steel. The 316L austenitic stainless steel, with its alloy ratio of 18% chromium, 12% nickel, and 2.5% molybdenum, effectively resists intergranular corrosion from strong corrosive media such as hydrochloric acid and sulfuric acid. For extreme internal working conditions, a composite anti-corrosion lining structure is specifically adopted. The inner walls of both the pickling tank 1 and the gas collecting tank 2 are covered with an anti-corrosion lining, and the pipeline 10 is made of acid-resistant plastic. The stainless steel material and the anti-corrosion lining resist corrosion from the pickling environment, while the acid-resistant plastic in the pipeline 10 prevents aging and leakage, reduces equipment maintenance frequency, and extends the overall service life of the device. Preferably, the interfaces of the pipeline 10, the liquid inlet 14, and the acid outlet 9 are sealed with sealing gaskets.

[0030] In summary, the fly ash acid washing device for municipal solid waste incineration of this invention systematically integrates dust control, gas collection, and waste liquid treatment. While improving fly ash treatment efficiency, it effectively solves the technical pain points of environmental pollution and equipment blockage in traditional processes, demonstrating significant environmental benefits and engineering application value. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial utilization value.

[0031] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A device for acid washing of fly ash from municipal solid waste incineration, characterized in that, Includes pickling tank (1) and gas collection tank (2): The pickling tank (1) is provided with a vent (3), and a filter screen (4) is provided at the vent (3); The gas collection tank (2) includes a liquid sealer (5). The top of the liquid sealer (5) is provided with a gas outlet (6), and the side wall is provided with a gas inlet (7), a water inlet (8) and an acid outlet (9). The gas inlet (7) is connected to the vent (3) via a pipeline (10), and the water inlet (8) is located above the acid outlet (9).

2. The acid washing device for fly ash from municipal solid waste incineration according to claim 1, characterized in that, The pickling tank (1) includes a main body and a cover (11). The main body is composed of a cylindrical tank body (12) and a conical tank bottom (13). The top of the tank body (12) is equipped with a cover (11). The cover (11) has a liquid inlet (14), a feed inlet (15) and a vent (3).

3. The municipal solid waste incineration fly ash acid washing device according to claim 2, characterized in that, A variable frequency motor (16) is installed on the cover (11). The shaft end of the variable frequency motor (16) is fixed coaxially with the agitator (17). The agitator (17) has a stirring blade (18) that extends into the tank (12). A baffle (19) is provided on the inner side wall of the tank (12).

4. The household garbage incineration fly ash pickling device according to claim 2, characterized in that, The bottom of the tank (13) is provided with a discharge port (20) and an inspection port (21), and a flow valve (22) is provided on the discharge port (20).

5. The household garbage incineration fly ash pickling device according to claim 2, characterized in that, The liquid inlet (14) is connected in sequence to a liquid dispensing pump (23) and a three-way solenoid valve (24) for connecting the water replenishment tank and the acid tank.

6. The acid washing device for fly ash from municipal solid waste incineration according to claim 1, characterized in that, A vacuum pump (25) with a one-way control valve is installed on the pipeline (10) connecting the vent (3) and the inlet (7). An outlet pipe (26) is connected to the inlet (7), and the bottom end of the outlet pipe (26) extends to the bottom of the liquid sealer (5).

7. The acid washing device for fly ash from municipal solid waste incineration according to claim 1, characterized in that, Both the pickling tank (1) and the gas collecting tank (2) are made of stainless steel. The inner walls of both the pickling tank (1) and the gas collecting tank (2) are covered with anti-corrosion lining. The pipeline (10) is made of acid-resistant plastic.

8. The acid washing device for fly ash from municipal solid waste incineration according to claim 1, characterized in that, A control valve (27) is provided at the acid outlet (9), and a pH meter (28) is provided inside the gas collecting tank (2). The control valve (27) and the pH meter (28) are connected by a signal.

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