Alkali spraying device for ultra-low nitrogen burner and ultra-low nitrogen burner

Abstract

The utility model provides an alkali spraying device for an ultra-low nitrogen burner and the ultra-low nitrogen burner, and belongs to the technical field of waste gas spraying treatment, the alkali spraying device comprises a tower body, a circulating water tank, a gas chamber, a packing layer, a spraying layer and a demisting layer are sequentially arranged in the tower body from bottom to top, and a gas inlet is formed in the side wall of the tower body corresponding to the gas chamber; the gas inlet is connected with a waste gas flue of the ultra-low nitrogen combustor through a gas inlet pipe; the nozzle assembly is arranged in the spraying layer, the nozzle assembly is connected with the circulating water tank through a spraying pipe, and a circulating water pump is arranged on the spraying pipe; the dosing tank is connected to the spraying pipe through an electromagnetic control valve; and the pH value control assembly is electrically connected with a pH sensor and an electromagnetic control valve which are arranged in the air chamber. The ultra-low-nitrogen burner has the beneficial effects that the alkali spraying device is arranged on the ultra-low-nitrogen burner, so that the ultra-low-nitrogen burner can further remove other acid pollutants in waste gas while reducing NOx emission, the waste gas treatment effect and efficiency are improved, and the environment-friendly requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas spray treatment technical field especially, relates to a kind of base spray device for ultra-low nitrogen combustor, ultra-low nitrogen combustor. BACKGROUND

[0002] As a new type of combustion equipment, ultra-low nitrogen combustor has gradually attracted widespread attention. Ultra-low nitrogen combustor mainly reduces the emission of nitrogen oxides (NOx) generated during combustion to a very low level through specific combustion technology to meet the increasingly stringent environmental regulations.

[0003] However, traditional ultra-low nitrogen combustor is generally not equipped with base spray device. Base spray device is a device commonly used in waste gas treatment, which sprays alkaline solution into waste gas to react with acidic substances in waste gas to achieve the purpose of removing pollutants.

[0004] With the publication and implementation of a series of environmental protection standards such as "Casting Industry Air Pollutant Discharge Standard" (GB39726-2020), the emission limit value requirements of environmental regulations for pollutants such as NOx in industrial waste gas are becoming more and more stringent. Traditional combustion technology and waste gas treatment method have been difficult to meet the urgent needs of modern industry for reducing NOx emission and removing various pollutants in waste gas. UTILITY MODEL CONTENT

[0005] In order to solve the above technical problems, the utility model provides a base spray device for ultra-low nitrogen combustor. On the other hand, it also provides an ultra-low nitrogen combustor.

[0006] The technical problem solved by the utility model can be realized by the following technical solutions:

[0007] A base spray device for ultra-low nitrogen combustor, comprising:

[0008] A tower body, a circulating water tank, an air chamber, a filler layer, a spray layer and a demisting layer are sequentially arranged in the tower body from bottom to top, an air inlet is provided on the side wall of the tower body corresponding to the air chamber, the air inlet is connected with the waste gas flue of the ultra-low nitrogen combustor through an air inlet pipe, and an air outlet is provided at the top of the tower body;

[0009] A nozzle assembly is arranged in the spray layer, the nozzle assembly is connected with the circulating water tank through a spray pipe, and a circulating water pump is arranged on the spray pipe;

[0010] A dosing tank is connected to the spray pipe through an electromagnetic control valve;

[0011] A pH value control assembly is electrically connected with a pH sensor arranged in the air chamber, and the pH value control assembly is electrically connected with the electromagnetic control valve.

[0012] Preferably, the circulating water tank is arranged in communication with the gas chamber.

[0013] Preferably, the packing layer and the spraying layer are arranged in two or more, and the two or more packing layers and the two or more spraying layers are arranged alternately.

[0014] Preferably, the packing layer is arranged at a preset angle, and the side wall of the tower body is provided with a waste liquid outlet corresponding to the bottom of the packing layer, and the waste liquid outlet is controllably communicated to a waste liquid recovery treatment pool through a liquid return pipe.

[0015] Preferably, the preset angle is 5°-45°.

[0016] Preferably, the waste liquid recovery treatment pool is controllably communicated to the circulating water tank through a multi-layer filtering assembly.

[0017] Preferably, the bottom of the circulating water tank is provided with a liquid discharge port, and the liquid discharge port is controllably communicated to the waste liquid recovery treatment pool through a liquid discharge pipe.

[0018] Preferably, the bottom of the waste liquid recovery treatment pool is provided with a sewage discharge port.

[0019] Preferably, the nozzle assembly is an atomizing nozzle.

[0020] The utility model also provides a kind of ultra-low nitrogen combustor, including combustor body, and the combustor body is equipped with waste gas flue, and the waste gas flue is communicated with the alkali spraying device as described above.

[0021] The advantages or beneficial effects of the technical scheme of the utility model are as follows:

[0022] The alkali spraying device is provided on the ultra-low nitrogen combustor, so that the ultra-low nitrogen combustor can further remove other acidic pollutants in the waste gas while reducing NOx emissions, improve the effect and efficiency of waste gas treatment, and meet the environmental protection requirements. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 For the preferred embodiment of the utility model, the structure diagram of the alkali spraying device for the ultra-low nitrogen combustor is shown.

[0024] Figure 2 For the preferred embodiment of the utility model, the structure diagram of the alkali spraying device for the ultra-low nitrogen combustor is shown.

[0025] Explanation of reference signs:

[0026] 1, tower body; 2, circulating water tank; 3, gas chamber; 4, filler layer; 41, first filler layer; 42, second filler layer; 5, spraying layer; 51, first spraying layer; 52, second spraying layer; 6, demisting layer; 7, air inlet; 8, air outlet; 9, nozzle assembly; 10, spraying pipe; 101, first spraying pipe; 102, second spraying pipe; 11, water outlet; 12, dosing tank; 13, electromagnetic control valve; 131, first electromagnetic control valve; 132, second electromagnetic control valve; 14, pH control assembly; 15, pH sensor; 16, waste liquid water outlet; 17, liquid return pipe; 18, waste liquid recovery treatment tank; 19, liquid discharge port; 20, liquid discharge pipe; 21, filter assembly. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited to the present application.

[0030] In the preferred embodiments of the present application, based on the above problems existing in the prior art, an alkali spraying device for an ultra-low nitrogen burner is provided, as shown in the figure, comprising: Figure 1 As shown in the figure, comprising:

[0031] The tower body 1 is provided with a circulating water tank 2, a gas chamber 3, a filler layer 4, a spraying layer 5 and a demisting layer 6 from bottom to top inside the tower body 1, an air inlet 7 is arranged on the side wall of the tower body 1 corresponding to the gas chamber 3, the air inlet 7 is connected with the waste gas flue (not shown in the figure) of the ultra-low nitrogen burner through an air inlet pipe (not shown in the figure), and an air outlet 8 is arranged at the top of the tower body 1;

[0032] The nozzle assembly 9 is arranged in the spraying layer 5, the nozzle assembly 9 is connected with the circulating water tank 2 through the spraying pipe 10, and a circulating water pump (not shown in the figure) is arranged on the spraying pipe 10;

[0033] The dosing tank 12 is connected to the spraying pipe 10 through the electromagnetic control valve 13;

[0034] The pH control assembly 14 is electrically connected with the pH sensor 15 arranged in the air chamber 3, and is electrically connected with the electromagnetic control valve 13.

[0035] Specifically, in the embodiment, the exhaust gas generated by the ultra-low nitrogen burner flows out from the exhaust flue of the burner body, flows into the air chamber 3 in the tower body 1 through the gas inlet 7 formed in the side wall of the tower body 1. In the tower body 1, the exhaust gas flows from bottom to top, sequentially passes through the filler layer 4, the spraying layer 5 and the demisting layer 6. The exhaust gas treated by the alkali spraying device is discharged from the gas outlet 8 formed at the top of the tower body 1.

[0036] The filler layer 4 is internally provided with adsorbing fillers. When the exhaust gas flows through the filler layer 4, it will react with the adsorbing fillers in the filler layer 4, and the exhaust gas treated by the adsorbing fillers continues to flow upwards to the spraying layer 5.

[0037] The spraying layer 5 is internally provided with the nozzle assembly 9 for spraying the alkali spraying liquid. By uniformly distributing the alkali spraying liquid on the exhaust gas flow path, it can ensure that the exhaust gas is fully contacted with the alkali spraying liquid and reacts, so that the alkali solution is sprayed to neutralize the NOx components in the flue gas, and the effect of deep denitration is achieved.

[0038] After the sprayed alkali spraying liquid is fully contacted with the exhaust gas and reacts, the gas after the spraying reaction continues to flow upwards and will pass through the demisting layer 17 and the filter bag inside the demisting layer 17. At this time, the purified gas can be discharged outwardly from the gas outlet 9.

[0039] The dosing tank 12 stores the alkali solution for neutralizing the NOx components in the exhaust gas. The electromagnetic control valve 13 can control the addition amount of the alkali solution as needed to ensure that the pH of the spraying liquid is always maintained within a suitable range, thereby achieving the best removal effect.

[0040] The circulating water in the circulating water tank 2 flows into the spraying pipe 10 under the action of the circulating water pump, and the addition amount of the alkali solution such as sodium hydroxide in the dosing tank 12 is controlled by the electromagnetic control valve 13, so that the two are mixed to form the alkali spraying liquid.

[0041] After the alkali spraying liquid reacts with the exhaust gas, it flows down from the filler layer 4 and returns to the circulating water tank 2. Then, under the action of the circulating water pump, it is pumped again to the spraying pipe 6 and then to the nozzle assembly 9 of the spraying layer 5. Then, the nozzle assembly 9 sprays the alkali spraying liquid in the form of atomization again, which is continuously used in a circulating manner. When the circulating washing liquid reaches a certain concentration, the liquid is discharged from the bottom liquid discharge port 19.

[0042] The pH control assembly 14 can monitor the acidity and alkalinity of the spraying liquid in the gas chamber 3 in real time, and according to the information fed back by the pH sensor 15, adjust the opening and closing degree of the electromagnetic control valve 13, so as to control the addition amount of the alkaline solution, and then adjust the concentration of the alkaline spraying liquid, so as to ensure the best removal effect.

[0043] Specifically, the bottom of the tower body 1 is provided with circulating water, and the circulating water and the side wall of the bottom of the tower body 1 jointly form a circulating water tank. The side wall of the bottom of the tower body 1 can also be provided with an injection port for injecting circulating water.

[0044] As a preferred embodiment, the circulating water tank 2 is arranged in communication with the gas chamber 3.

[0045] Further specifically, the opening of the gas inlet 7 can be arranged downwardly, so as to face the circulating water in the circulating water tank 2. The circulating water in the circulating water tank 2 is used to preliminarily purify and pretreat the exhaust gas.

[0046] Specifically, the exhaust gas entering the tower body 1 first contacts the circulating water in the circulating water tank 2, and the water in the circulating water tank 2 absorbs part of the heat in the exhaust gas, thereby preliminarily cooling the exhaust gas.

[0047] At the same time, part of the pollutants in the exhaust gas can be preliminarily dissolved or adsorbed in the water, thereby reducing the pollutant load entering the subsequent filler layer and spraying layer, and being beneficial to improving the removal efficiency of the pollutants by the entire alkali spraying device.

[0048] The side wall of the tower body 1 is provided with a water outlet 11 corresponding to the circulating water tank 2, and the water outlet 11 is provided with a circulating water pump. Under the action of the circulating water pump, the liquid in the circulating water tank 2 can enter the spraying pipe 6 through the water outlet 11.

[0049] As a preferred embodiment, the filler layer 4 and the spraying layer 5 are arranged to be two or more, and the two or more filler layers 4 and spraying layers 5 are arranged alternately.

[0050] Specifically, in the embodiment, a multi-layer filler and spraying layout mode is adopted on the exhaust gas flow path, so as to increase the contact area and contact time of the exhaust gas and the alkaline spraying liquid, make them fully react, and improve the denitration effect.

[0051] Further specifically, as shown in Figure 1 The filler layer 4 includes a first filler layer 41 and a second filler layer 42, and the spraying layer 5 includes a first spraying layer 51 and a second spraying layer 52.

[0052] The adsorbing filler in the second filler layer 42 can be the same as or different from the first filler layer 41. For example, the second filler layer 42 can reduce the specific surface area and porosity on the basis of the first filler layer 41, thereby reducing the cost.

[0053] The first filler layer 41, the first spray layer 51, the second filler layer 42 and the second spray layer 52 are sequentially arranged from bottom to top inside the tower body 1. When the exhaust gas enters from the bottom inlet 7 of the tower body 1, it first passes through the first filler layer 41, and the pollutants in the exhaust gas fully contact the fillers in the first filler layer 41 and are adsorbed or chemically reacted. Then, the exhaust gas enters the first spray layer 51, and the spray liquid is uniformly sprayed on the exhaust gas to further react with the pollutants in the exhaust gas to dissolve or neutralize the pollutants. Then, the exhaust gas enters the second filler layer 42 to continue the adsorption and reaction of the pollutants. Finally, the exhaust gas enters the second spray layer 52 to receive the treatment of the spray liquid again.

[0054] Through the structure of two or more filler layers 4 and spray layers 5 arranged alternately, the contact area and contact time of the exhaust gas with the spray liquid are greatly increased. The exhaust gas can more fully react with the chemicals in the spray liquid under the repeated action of the multiple filler and spray layers, thereby improving the efficiency of removing NOx.

[0055] Further specifically, the device further comprises a bracket, part of the bracket extending into the spray layer 5, and the part of the bracket extending into the spray layer 5 is uniformly distributed with nozzle assemblies 9. The spray pipe 10 is arranged inside the bracket, and the liquid outlet of the spray pipe 10 is connected with the nozzle assemblies 9.

[0056] Further specifically, as shown in Figure 1 , the nozzle assemblies 9 in the two or more spray layers 5 can use the same spray pipe 10 to provide the alkaline spray liquid, and the concentration of the alkaline spray liquid provided by the spray pipe 10 is the same.

[0057] Further specifically, as shown in Figure 2 , the nozzle assemblies 9 in the two or more spray layers 5 can use different spray pipes to respectively provide the alkaline spray liquid, for example, the concentration of the alkaline spray liquid in the first spray layer 51 and the second spray layer 52 can be the same or different.

[0058] For example, the spray pipe 10 includes a first spray pipe 101 and a second spray pipe 102. The dosing tank 12 is controllably communicated to the first spray pipe 101 through a first electromagnetic control valve 131, and the first spray pipe 101 is used to provide the first spray layer 51 with the alkaline spray liquid of a first predetermined concentration.

[0059] Similarly, the dosing tank 12 is controllably communicated to the second spray pipe 102 through a second electromagnetic control valve 132, and the second spray pipe 102 is used to provide the second spray layer 52 with the alkaline spray liquid of a second predetermined concentration.

[0060] The second predetermined concentration can be greater than, equal to or less than the first predetermined concentration.

[0061] In the embodiment, the second predetermined concentration is less than the first predetermined concentration, the use amount of the alkaline solution in the dosing tank is reduced, and the cost is reduced.

[0062] As a preferred embodiment, the filler layer 4 is arranged at a preset angle, the side wall of the tower body 1 is provided with a waste liquid outlet 16 corresponding to the bottom of the filler layer 4, and the waste liquid outlet 16 is controllably communicated to a waste liquid recovery and treatment pool 18 through a liquid return pipe 17.

[0063] Specifically, the filler layer 4 is arranged at a certain angle relative to the horizontal plane. The waste gas flows in the inclined adsorption filler, further increasing the contact area and contact time of the waste gas and the filler, so that the waste gas is fully contacted with the adsorption filler, and the adsorption efficiency is improved.

[0064] The side wall of the tower body 1 is provided with a waste liquid outlet 16, which is used to discharge the alkaline spraying liquid in the spraying layer 5 which does not participate in the reaction or has reacted and does not flow from the filler layer to the circulating water tank during the spraying process, preventing the alkaline spraying liquid from remaining on the surface of the filler layer and hindering the upward flow of the waste gas.

[0065] An electronic valve is arranged in the liquid return pipe 17. The liquid return of the alkaline spraying liquid in the spraying layer 5 is realized by the on-off state of the electronic valve. When it is needed to return the alkaline spraying liquid after spraying, the electronic valve is opened to allow the sprayed alkaline spraying liquid to flow back to the waste liquid recovery and treatment pool 18 through the liquid return pipe 17, and then flow back to the circulating water tank through the multi-layer filtering assembly 21, which can be used for the spraying process of the spraying layer again, reducing the use amount of new chemical reagents.

[0066] The waste liquid recovery and treatment is realized by the waste liquid recovery and treatment pool 18, preventing secondary pollution and reducing operating costs.

[0067] As a preferred embodiment, the preset angle is 5°-45°.

[0068] Specifically, in the embodiment, the inclination angle of the filler layer 4 relative to the horizontal plane is set to be between 5° and 45°. As an example but not limitation, the inclination angle can be set to 5°, 10°, 15°, 20°, 25°, 30°, 34°, 40°, or 45°.

[0069] Further preferably, the inclination angle is set to be between 15° and 30°. As an example but not limitation, the inclination angle can be set to 15°, 20°, 25°, or 30°.

[0070] As a preferred embodiment, the bottom of the waste liquid recovery and treatment pool 18 is provided with a pollution discharge port (not shown in the figure).

[0071] Specifically, in the embodiment, a drain port is arranged at the bottom of the waste liquid recycling treatment tank 18, which is used to periodically discharge the precipitates and other pollutants in the waste liquid recycling treatment tank 18, so as to keep the waste liquid recycling treatment tank 18 clean and normally operated.

[0072] As a preferred embodiment, the bottom of the circulating water tank 2 is provided with a liquid discharge port 19, which is controllably communicated to the waste liquid recycling treatment tank 18 through a liquid discharge pipe 20.

[0073] Specifically, in the embodiment, the liquid discharge port is arranged at the bottom of the circulating water tank 2, so as to timely discharge the waste liquid in the circulating water tank 2 for treatment.

[0074] Further specifically, an electronic valve can be arranged on the liquid discharge pipe 20, which is used to control the opening and closing of the liquid discharge.

[0075] Further specifically, a liquid discharge pump can also be arranged on the liquid discharge pipe 20, which is used to provide power for discharging the waste liquid.

[0076] When the liquid in the circulating water tank 2 reaches a certain concentration, the electronic valve is opened, and the waste liquid is discharged to the waste liquid recycling treatment tank 18. When the waste liquid is completely discharged, the electronic valve is closed.

[0077] As a preferred embodiment, the waste liquid recycling treatment tank 18 is controllably communicated to the circulating water tank 2 through a multi-layer filtering assembly 21.

[0078] Specifically, in the embodiment, the multi-layer filtering assembly 21 can perform multi-stage filtering and treatment on the alkaline spraying liquid returned from the spraying layer 5, remove impurities and pollutants therein, and then send the treated water back to the circulating water tank 2 in a controllable manner, so as to realize recycling of the waste liquid, reduce operation cost, and prevent secondary pollution.

[0079] A pump can also be arranged between the waste liquid recycling treatment tank 18 and the multi-layer filtering assembly 21, or between the multi-layer filtering assembly 21 and the circulating water tank 2.

[0080] As a preferred embodiment, the nozzle assembly 9 is an atomizing nozzle. The atomizing nozzle can convert the alkaline spraying liquid into tiny droplets to form a mist, so that the mist can fully contact with the waste gas. The atomizing mode can make the alkaline spraying liquid quickly and directly react with the waste gas, so as to improve the efficiency of removing NOx.

[0081] The utility model also provides a kind of ultra-low nitrogen combustor, including combustor body, and combustor body is equipped with waste gas flue, and waste gas flue is communicated with the above-mentioned alkaline spraying device.

[0082] Specifically, a melting furnace is arranged in the combustor body, for example, a natural gas melting furnace.

[0083] The melting furnace is sequentially provided with multiple combustion zones, such as a first combustion zone and a second combustion zone.

[0084] The utility model provides a kind of natural gas melting furnace with ultra-low nitrogen combustion device and its matching spray device, advanced combustion technology and effective waste gas post-processing measures are combined, the goal of significantly reducing NOx emission is realized, meet current strict environmental protection standard. Especially suitable for reducing nitrogen oxides (NOx) emission in industrial combustion process and treating pollutants in waste gas.

[0085] The matching spray device includes a spray tower located in the flue of the melting furnace tail, the spray tower uses the alkali spray device as described above, to significantly reduce the NOx emission, while ensuring that the efficiency of the natural gas melting furnace is not affected.

[0086] In the tower, the NOx component in flue gas is neutralized by spraying alkaline spray liquid, achieving deep denitration effect. The spray tower uses nozzle assembly 9, which can uniformly distribute alkaline solution on the waste gas flow path, ensuring sufficient contact reaction. It also contains pH control component 14, which monitors the alkalinity of the spray liquid in real time and adjusts the alkali concentration as needed to ensure optimal removal effect. At the same time, equipped with waste liquid recovery and treatment system, to prevent secondary pollution, while reducing operating costs.

[0087] The advantages or beneficial effects of the above technical solutions are that the utility model is equipped with an alkali spray device on the ultra-low nitrogen burner, which can further remove other acidic pollutants in the waste gas while reducing NOx emissions, improving the effect and efficiency of waste gas treatment, and meeting environmental protection requirements.

[0088] The above is only the preferred embodiment of the utility model, and does not limit the implementation and protection scope of the utility model. For those skilled in the art, it should be realized that any equivalent replacement and obvious change made according to the content of the specification and drawings should be included in the protection scope of the utility model.

Claims

1. An alkali spraying device for an ultra-low NOx burner, characterized by, The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device.

2. The alkali shower device according to claim 1, characterized in that The application relates to an alkali spraying device.

3. The alkali shower device according to claim 1, wherein The application relates to an alkali spraying device.

4. The alkali shower device according to claim 1, wherein The application relates to an alkali spraying device.

5. The alkali shower device according to claim 4, characterized in that The application relates to an alkali spraying device.

6. The alkali shower device according to claim 4, wherein The application relates to an alkali spraying device.

7. The alkali shower device according to claim 4, wherein The application relates to an alkali spraying device.

8. The alkali shower device of claim 4, wherein The application relates to an alkali spraying device.

9. The alkali shower device of claim 1, wherein The application relates to an alkali spraying device.

10. An ultra-low NOx burner characterized by, The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. The application relates to an alkali spraying device. 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