Hearth cooling structure utilizing landfill leachate concentrated liquor to spray back

Abstract

The utility model discloses a hearth cooling structure utilizing landfill leachate concentrated liquor back-spraying, which comprises a landfill leachate storage tank and a waste incineration boiler, the side surface of the landfill leachate storage tank is connected with a main liquid supply pipe, and the main liquid supply pipe is respectively provided with a first three-way pipe, a second three-way pipe and a third three-way pipe; a PH adjusting box is installed on the section, between the second three-way pipe and the third three-way pipe, of the main liquid supply pipe, a first liquid pumping pipe and a second liquid pumping pipe are arranged on the section, between the first three-way pipe and the second three-way pipe, of the main liquid supply pipe, and the other two ends of the third three-way pipe are connected with a right hearth liquid outlet pipe and a left hearth liquid outlet pipe respectively. According to the hearth cooling structure utilizing the landfill leachate concentrated liquid to spray back, through alternate operation of the two pipelines, solid impurities and most suspended particles in the hearth cooling structure are removed through the filter, each pipeline has sufficient time to be treated by the filter, the pipelines are prevented from being blocked by the impurities in the landfill leachate, and equipment can continuously operate for a long period.

Description

Technical Field

[0001] The utility model relates to the technical field of furnace cooling of garbage incineration boilers, in particular to a furnace cooling structure utilizing concentrated liquid of garbage leachate to spray back. Background Art

[0002] The main principle of waste incineration power generation is to use domestic waste as fuel, burn it in a boiler, and input the superheated steam generated into a steam turbine to realize the process of converting heat energy into electrical energy. After the garbage is collected at the waste power plant, it is piled in the garbage bin for fermentation, producing a high-concentration organic or inorganic high-concentration liquid called leachate. Leachate is a high-concentration wastewater containing a variety of pollutants and difficult to degrade. If it is not treated or treated improperly, it will cause serious pollution to the surrounding environment, especially the nearby groundwater and soil. Its treatment problem has become a hot topic in the global environmental protection industry. For waste incineration power plants, the treatment of leachate is also a focal issue. With the gradual improvement of waste resource utilization, the construction of domestic waste power plants has also gradually emerged, and the treatment of leachate has become particularly prominent. Since the water quality of landfill leachate is relatively complex, the traditional sewage atomization method and biological method are used to treat landfill leachate, but the treatment effect is poor and it is difficult to meet the national sewage discharge standards. For this reason, a lot of research and engineering experiments have been done at home and abroad on landfill leachate treatment, and many rich and valuable experiences have been obtained. For example, leachate biological treatment process, reverse osmosis treatment process, and advanced oxidation treatment process have been widely used. However, no matter which method is used, it is difficult to completely decompose and treat landfill leachate and completely solve its pollution problem. In addition, the above-mentioned treatment methods have many problems such as large investment, large land area, long construction time, and complex operation and maintenance.

[0003] In addition, applied research has found that in the process of boiler incineration of garbage to generate electricity, the boiler's furnace is very likely to reach high temperature, which can easily cause coking of the grate and furnace wall, affecting the boiler's combustion conditions and service life, and is also likely to increase the content of nitrogen oxides produced by the boiler incineration of garbage, polluting the environment; if the concentrated liquid of garbage leachate is sprayed back into the furnace and the temperature in the furnace is kept within a certain range, it can reduce the coking of the boiler grate and furnace wall, consume the high-salt concentrated liquid of the leachate treatment station, and reduce the generation of nitrogen oxides, which meets environmental protection requirements.

[0004] The current garbage leachate concentrated liquid back-spray system has disadvantages such as easy pipe clogging, inconvenient cleaning, and difficulty in achieving long-term continuous operation. At the same time, the garbage leachate may contain acidic or alkaline substances, which may corrode the metal surface inside the furnace, thereby affecting the safety and stable operation of the furnace. The back-spraying of garbage leachate may affect the combustion process and effect in the furnace, resulting in unstable combustion or incomplete combustion in the furnace, which has a negative impact on the normal operation of the furnace and exhaust gas emissions. Utility Model Content

[0005] The utility model aims to provide a furnace cooling structure utilizing concentrated leachate solution to solve the problems raised in the above-mentioned background technology that the furnace cooling structure utilizing concentrated leachate solution to be sprayed back into the furnace is prone to pipeline blockage, is difficult to operate periodically, and will corrode the metal surface inside the furnace, thus easily affecting the combustion conditions of the boiler.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a furnace cooling structure using concentrated leachate to spray back, comprising a leachate storage tank and a waste incineration boiler, wherein the leachate storage tank is connected to a main liquid supply pipe on its side, and the main liquid supply pipe is respectively provided with a first tee, a second tee and a third tee, a section of the main liquid supply pipe between the second tee and the third tee is provided with a PH regulating box, and a section of the main liquid supply pipe between the first tee and the second tee is provided with a third tee. A pump liquid pipe and a second pump liquid pipe, and the other two ends of the third tee are respectively connected to the right furnace liquid outlet pipe and the left furnace liquid outlet pipe, the other ends of the right furnace liquid outlet pipe and the left furnace liquid outlet pipe are both equipped with atomizing spray guns, and the right furnace liquid outlet pipe and the left furnace liquid outlet pipe are also connected with ventilation valves, and the atomizing spray guns are installed in the waste incineration boiler, an insulation box is provided between the right furnace liquid outlet pipe and the left furnace liquid outlet pipe, and the right furnace liquid outlet pipe and the left furnace liquid outlet pipe are respectively equipped with evaporating tanks arranged in the insulation box.

[0007] Preferably, the first pump liquid pipe and the second pump liquid pipe have the same structure, and the first pump liquid pipe and the second pump liquid pipe are fixed with a clean water pipe through pipe fittings, and filters and water pumps are installed on the first pump liquid pipe and the second pump liquid pipe.

[0008] Preferably, an agitator is installed in the pH regulating box via a motor, and the upper end of the pH regulating box is connected to the pH regulating liquid tank via a pipeline.

[0009] Preferably, an air hood is welded above the side of the waste incineration boiler, and the air hood is located above the atomizing spray gun.

[0010] Preferably, a hot air duct is fixed to the side of the air hood via a pipe, and the hot air duct is sealed and connected to the upper end of the insulation box.

[0011] Preferably, the upper and lower ends of the evaporator are respectively conical structures, and the lower end and upper end of the evaporator are respectively for liquid inlet and liquid outlet, and heat conduction pipes are welded at even intervals on the side of the evaporator.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The furnace cooling structure that utilizes concentrated leachate to spray back into the furnace operates alternately through dual pipelines, removes solid impurities and most suspended particles through filters, and allows each pipeline to have sufficient time to be processed by the filter, thereby avoiding clogging of the pipeline by impurities in the leachate and allowing the equipment to operate continuously for a long period of time.

[0014] (2) The structure for cooling the furnace by spraying concentrated leachate back into the furnace uses the boiler's own temperature to evaporate the leachate, allowing the solid content in the liquid to reach a certain level and consuming part of the boiler's heat.

[0015] (3) The structure for cooling the furnace by spraying the concentrated leachate back into the leachate is used to adjust the pH value of the concentrated leachate, thereby reducing the corrosion effect of the acidic or alkaline substances in the leachate on the boiler and ensuring the safe use of the boiler.

[0016] (4) The structure for cooling the furnace by spraying concentrated leachate back into the furnace allows the concentrated leachate to be sprayed back into the furnace and contact with the high-temperature gas in the furnace, absorbing part of the heat and generating steam, thereby achieving the purpose of cooling the furnace and maintaining the temperature in the furnace within a certain range without affecting the combustion conditions of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a top view of a furnace cooling structure using concentrated leachate to spray back into the furnace in the utility model;

[0018] Figure 2 The utility model is a furnace cooling structure using concentrated liquid of landfill leachate to spray back Figure 1 The enlarged structural diagram at A in the middle;

[0019] Figure 3 This is a side view of a furnace cooling structure using concentrated leachate to spray back into the furnace in the utility model;

[0020] Figure 4 The utility model is a furnace cooling structure using concentrated liquid of landfill leachate to spray back Figure 3 The enlarged structural diagram at B in the middle.

[0021] In the figure: 1. garbage leachate storage tank; 2. main liquid supply pipe; 201. first pump liquid pipe; 202. second three-way pipe; 203. third three-way pipe; 204. right furnace liquid outlet pipe; 205. first three-way pipe; 206. second pump liquid pipe; 207. left furnace liquid outlet pipe; 208. ventilation valve; 3. PH regulating box; 301. agitator; 4. atomizing spray gun; 5. garbage incineration boiler; 501. hot air duct; 502. air hood; 6. clean water pipe; 7. filter; 8. water pump; 9. insulation box; 901. heat pipe; 902. evaporation tank. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-4The utility model provides a technical solution: a furnace cooling structure using concentrated leachate to spray back, comprising a leachate storage tank 1 and a waste incineration boiler 5, wherein the leachate storage tank 1 is connected to a main liquid supply pipe 2 on its side, and the main liquid supply pipe 2 is provided with a first three-way pipe 205, a second three-way pipe 202 and a third three-way pipe 203, respectively; a PH regulating box 3 is installed at a section of the main liquid supply pipe 2 between the second three-way pipe 202 and the third three-way pipe 203, a stirrer 301 is installed in the PH regulating box 3 through a motor, and the upper end of the PH regulating box 3 is connected to a PH regulating liquid tank through a pipeline, and this structure can add PH regulating liquid into the PH regulating box 3 as needed, so that the stirrer 301 mixes the PH regulating liquid with the leachate to regulate the leachate. The pH value of the filtrate is reduced, the corrosion effect of the acidic or alkaline substances in the garbage leachate on the boiler is reduced, and the safe use of the boiler is ensured. A section between the first three-way pipe 205 and the second three-way pipe 202 is provided with a first pump liquid pipe 201 and a second pump liquid pipe 206. Pressure gauges are arranged on the first pump liquid pipe 201 and the second pump liquid pipe 206 to perform pressure detection respectively. A flow meter is arranged on the main liquid supply pipe 2 between the second three-way pipe 202 and the third three-way pipe 203 to measure the total amount of garbage leachate. The first pump liquid pipe 201 and the second pump liquid pipe 206 have the same structure, and the main first pump liquid pipe 201 and the second pump liquid pipe 206 are fixed with a clean water pipe 6 through pipe fittings, and the first pump liquid pipe 201 and the second pump liquid pipe 206 are both installed with filters 7 and water pump 8. This structure enables the first pump liquid pipe 201 and the second pump liquid pipe 206 to be cleaned through the clean water pipe 6 respectively. The water valve of the clean water pipe 6 is opened regularly or irregularly, and clean water can be introduced to clean the pipeline and the atomizing spray gun 4 to prevent pipeline blockage. The first pump liquid pipe 201 and the second pump liquid pipe 206 are operated alternately, so that the equipment can operate for a long time. Electromagnetic switch valves are installed on both sides of the water pump 8, and a pressure transmitter is set on the pipeline. The controller is connected by a wire, so that the controller controls the water valves and the water pump 8, the pressure gauge, and the flow meter at various locations. The filter 7 is used for filtering the garbage leachate to remove the solid impurities and most of the suspended particles therein, and the other two ends of the third three-way pipe 203 are respectively connected to the right furnace liquid outlet pipe 204 and the left furnace liquid outlet pipe 207, the other ends of the right furnace liquid outlet pipe 204 and the left furnace liquid outlet pipe 207 are both installed with an atomizing spray gun 4, and the right furnace liquid outlet pipe 204 and the left furnace liquid outlet pipe 207 are also connected with a vent valve 208, and the atomizing spray gun 4 is installed in the waste incineration boiler 5, and an air hood 502 is welded above the side of the waste incineration boiler 5, and the air hood 502 is located above the atomizing spray gun 4. This structure can lead out part of the heat flow of the waste incineration boiler 5 through the air hood 502 for waste heat utilization treatment, and a hot air duct 501 is fixed to the side of the air hood 502 through a pipe fitting, and the hot air duct 501 is sealed and connected to the upper end of the insulation box 9. In this structure, the air hood 502 guides the waste heat of the waste incineration boiler 5 into the insulation box 9 through the hot air duct 501.An exhaust pipe is provided through the insulation box 9 to connect with the main exhaust pipe of the garbage incineration boiler 5. An insulation box 9 is provided between the right furnace liquid outlet pipe 204 and the left furnace liquid outlet pipe 207. The right furnace liquid outlet pipe 204 and the left furnace liquid outlet pipe 207 are respectively installed with an evaporation tank 902 provided in the insulation box 9. The upper and lower ends of the evaporation tank 902 are respectively conical structures, and the lower end and the upper end of the evaporation tank 902 are respectively liquid inlet and liquid outlet, and the side of the evaporation tank 902 is welded with heat conduction pipes 901 at even intervals. This structure allows the evaporation tank 902 to increase the heat absorption treatment through the heat conduction pipes 901, so that the evaporation tank 902 can be fully heated to heat and evaporate the garbage leachate. An exhaust valve is provided on the evaporation tank 902 to discharge excess gas and prevent the evaporation tank 902 from expanding.

[0024] Working principle: When using the structure for cooling the furnace by spraying concentrated leachate back into the garbage leachate tank, first, the garbage leachate storage tank 1 collects and stores the garbage leachate. After the garbage incineration boiler 5 is burned normally, the control valve of the main liquid supply pipe 2 is opened, and the valve of the first pump liquid pipe 201 is opened. At the same time, the water pump 8 is started to make the garbage leachate flow from the first three-way pipe 205 to the second three-way pipe 202 through the first pump liquid pipe 201, and then the PH regulating liquid is added through the PH regulating box 3. The agitator 301 is used to fully stir the PH value of the garbage leachate, and then the third three-way pipe 203 flows into the right furnace outlet pipe 204 and the left furnace outlet pipe 207 respectively. After that, the waste heat generated by the garbage incineration boiler 5 is introduced into the heat exchanger through the gas hood 502. The air is passed into the air guide pipe 501 and then into the heat preservation box 9. The evaporation tank 902 is heated by the heat conduction pipe 901, so that the landfill leachate in the evaporation tank 902 is heated and evaporated. After that, the landfill leachate is sprayed to both sides of the waste incineration boiler 5 through the atomizing spray gun 4, so that the landfill leachate contacts with the high-temperature gas in the furnace, absorbs part of the heat and generates steam, thereby achieving the purpose of cooling and keeping the temperature in the furnace within a certain range without affecting the combustion condition of the boiler. The ventilation valve 208 ventilates the atomizing spray gun 4 with compressed air. After a period of time, the valve of the first pump liquid pipe 201 is closed, and the valve of the second pump liquid pipe 206 is opened to allow the landfill leachate to circulate through the second pump liquid pipe 206, thereby completing a series of tasks.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A furnace cooling structure utilizing concentrated waste leachate to spray back into the furnace, comprising a waste leachate storage tank (1) and a waste incineration boiler (5), characterized in that: The landfill leachate storage tank (1) is connected to a main liquid supply pipe (2) on its side, and the main liquid supply pipe (2) is respectively provided with a first three-way pipe (205), a second three-way pipe (202) and a third three-way pipe (203); a section of the main liquid supply pipe (2) between the second three-way pipe (202) and the third three-way pipe (203) is provided with a PH regulating box (3); a section of the main liquid supply pipe (2) between the first three-way pipe (205) and the second three-way pipe (202) is provided with a first pump liquid pipe (201) and a second pump liquid pipe (206); and the other two ends of the third three-way pipe (203) are respectively connected to the right furnace liquid outlet pipe (2 04) and a left furnace liquid outlet pipe (207), the other ends of the right furnace liquid outlet pipe (204) and the left furnace liquid outlet pipe (207) are both equipped with an atomizing spray gun (4), and the right furnace liquid outlet pipe (204) and the left furnace liquid outlet pipe (207) are also connected to a vent valve (208), and the atomizing spray gun (4) is installed in a waste incineration boiler (5), an insulation box (9) is provided between the right furnace liquid outlet pipe (204) and the left furnace liquid outlet pipe (207), and an evaporation tank (902) arranged in the insulation box (9) is respectively installed on the right furnace liquid outlet pipe (204) and the left furnace liquid outlet pipe (207).

2. The furnace cooling structure using concentrated leachate to spray back according to claim 1 is characterized in that: The first pump liquid pipe (201) and the second pump liquid pipe (206) have the same structure, and the first pump liquid pipe (201) and the second pump liquid pipe (206) are fixed with a clean water pipe (6) via pipe fittings, and a filter (7) and a water pump (8) are installed on both the first pump liquid pipe (201) and the second pump liquid pipe (206).

3. The furnace cooling structure using concentrated leachate to spray back according to claim 1 is characterized in that: The pH regulating box (3) is provided with a stirrer (301) via a motor, and the upper end of the pH regulating box (3) is connected to a pH regulating liquid tank via a pipeline.

4. The furnace cooling structure using concentrated leachate to spray back according to claim 1 is characterized in that: An air hood (502) is welded above the side of the waste incineration boiler (5), and the air hood (502) is located above the atomizing spray gun (4).

5. The furnace cooling structure using concentrated leachate to spray back according to claim 4 is characterized in that: A hot air guide pipe (501) is fixed to the side of the air hood (502) via a pipe fitting, and the hot air guide pipe (501) is sealed and connected to the upper end of the heat preservation box (9).

6. The furnace cooling structure using concentrated leachate to spray back according to claim 1 is characterized in that: The upper and lower ends of the evaporation tank (902) are respectively conical structures, and the lower end and upper end of the evaporation tank (902) are respectively for liquid inlet and liquid outlet, and heat conduction pipes (901) are welded on the side of the evaporation tank (902) at even intervals.

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