A flange-type inlet pollutant solid removal agent injection device

Abstract

The present invention provides a flange-type inlet pollutant solid remover injection device, comprising a remover inlet, a remover spray gun flange plate, a remover spray gun, a remover outlet, and a remover guide plate, wherein the remover inlet, the remover spray gun flange plate, and the remover outlet are arranged on the remover spray gun, the remover spray gun has a nozzle number greater than or equal to 2, the remover guide plate is welded to the spray gun through a bracket, arranged along the spray gun longitudinally, and has an Ω-shaped cross section, and the flat wing surface extended from the remover guide plate can expand its area, the remover guide plate is located downstream of the flue gas contact position to form a low-pressure zone, enhance the turbulence of the fluid, avoid the influence of the flue gas, expand the remover injection area, and make the remover better combined with the corresponding fluid, and a remover guide plate is arranged below the inlet elbow to further even out the injection amount of each spray gun.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas pollutant removal, and in particular to a flange-type inlet pollutant solid removal agent injection device. Background Art

[0002] There are many pollutants in modern industrial flue gas. For example, industrial production enterprises such as coal-fired power plants, waste incineration, metal smelting, and cement production will produce substances that pollute the atmosphere, mainly including SO2, SO3, NOx, HCl, heavy metals (represented by mercury), dioxins and other pollutants.

[0003] Acidic gases are the most common pollutants in industrial flue gas, represented by the above-mentioned SO2, NOx, SO3, and HCl. SO2 and NOx contain a lot of pollutants, which, if not properly controlled, will cause environmental pollution such as acid rain and photochemical smog. SO3, as a small amount of pollutant in flue gas, is several times more harmful than SO2. Too much SO3 in flue gas will directly lead to the "blue plume" phenomenon, which will cause irreversible damage to the human body when it enters the human respiratory tract.

[0004] In industry, wet desulfurization, dry / semi-dry desulfurization and other methods are usually used to remove SO2 from flue gas. Among them, the dry / semi-dry method is often used in industry to spray solid or semi-solid absorbents into the flue or proprietary reactor, such as Ca(OH)2, Na2CO3, quicklime, alkali metal and alkaline earth metal oxides and other effective substances. In this process, HCl and SO3, which are also acidic gases, are also partially removed; NOx removal methods are currently more mature, mainly SCR and SNCR. In the presence of a catalyst, NOx in the flue gas reacts with reducing agents such as NH3 and urea injected into the flue gas to generate N2, thereby reducing NOx emissions.

[0005] Heavy metals in industrial flue gas are local, regional and global pollutants. Studies have shown that heavy metals, represented by mercury, can cause pollution to human life and are associated with the occurrence of a variety of diseases. Heavy metals can enter the atmosphere through a variety of emission channels, and coal combustion has become the largest source of heavy metal emissions.

[0006] The treatment method usually involves spraying adsorbents such as activated carbon, fly ash, calcium-based substances, activated coke and other new adsorbents into the flue before the dust collector through a spray gun. Through physical adsorption, mercury and other heavy metals in the flue gas are removed and then captured by the dust collector.

[0007] Dioxins are chlorinated cyclotriaryl hydrocarbon compounds that cannot be degraded or excreted in the human body and are environmental pollutants that pose a great threat to human health. They are highly carcinogenic and can cause deformities, and damage the immune and reproductive functions of the human body. There are no related symptoms, but it can be said that places where deformities, cancers and other symptoms occur in large areas will be suspected of being dioxin disaster areas. In industry, adsorbents such as activated carbon and activated coke are usually sprayed into the flue with a spray gun to remove dioxins and reduce their emissions.

[0008] From the above content, we can find the universality of spray guns in industrial pollutant removal. Pollutant removal frequently uses spray guns to transport corresponding adsorbents or absorbents to flues or specific absorbers. However, existing adsorbent / absorbent injection devices generally use straight pipes to directly insert into the flue, and the adsorbent / absorbent outlet of the injection device uses a single row of straight nozzles. The diffusion effect of the particles sprayed from a single nozzle is not ideal and cannot completely cover the flue flow surface. Under the pressure of flue gas, the diffusion area of ​​the adsorbent / absorbent sprayed from the outlet will be reduced compared to the static state, so that the pollutants in the flue gas cannot fully contact with the adsorbent / absorbent, and the pollutant absorption rate / adsorption rate is reduced. Summary of the invention

[0009] The present invention provides a flange-type inlet pollutant solid removal agent injection device, and the specific technical solution is:

[0010] A flange-type inlet pollutant solid remover injection device comprises a remover inlet, a remover spray gun flange plate, a remover spray gun, a remover outlet, and a remover guide plate, wherein the remover spray gun is composed of a nozzle, wherein the remover spray gun is composed of nozzles, the total number of nozzles is n and n≥2, the spray gun flange plate is fixedly arranged on the upper part of the remover spray gun by bolts, the remover inlet is arranged on the top of the remover spray gun, the remover outlet is arranged on the bottom of the remover spray gun, the remover guide plate is Ω-shaped, has flat wing parts extending to both sides, is longitudinally welded to the remover spray gun through a bracket, and the remover spray gun is vertically inserted into the flue;

[0011] Furthermore, the stripper guide plate has a flat wing portion extending to both sides, and the width of the flat wing portion is 1 to 2 times the radius corresponding to the semicircle of the stripper guide plate;

[0012] Preferably, the nozzle diameter is 1.0 cm to 10.0 cm;

[0013] Preferably, the nozzle spacing is 0.5 to 2 m;

[0014] Furthermore, the longest length of the nozzle is 50% to 80% of the total height of the flue;

[0015] Furthermore, the distance between the bottom of the spray gun and the bottom of the flue is the difference in length between two adjacent spray pipes;

[0016] Preferably, the number of nozzles is n=5.

[0017] After adopting the structure of the present invention, the desorbents such as activated carbon powder and other solids enter the desorbent inlet located at the spray gun flange plate along the air transported by the compressed air pipeline, are fully mixed after passing through a section of the front end of the desorbent spray gun without an outlet, and are sprayed into the flue from the desorbent outlet. The lengths of each nozzle of the desorbent spray gun are different, ensuring that the desorbent is diffused at all heights. The desorbent guide plate is arranged longitudinally along the desorbent spray gun, and the cross-section of the desorbent guide plate is Ω-shaped. The desorbent guide plate forms a low-pressure area downstream of the flue gas contact position, which enhances the turbulence of the fluid, avoids the pressure influence from the flue gas, expands the desorbent injection area, and enables the desorbent to better combine with the corresponding fluid. Due to the design of different lengths of multiple nozzles of the desorbent spray gun, it can be ensured that the amount of desorbents such as activated carbon injected is basically consistent. The dual functions of setting the degassing agent guide plate and the nozzle of different lengths ensure that the outflow of activated carbon and other degassing agents can be evenly and stably diffused, ensure full contact with the pollutants in the flue, increase the adsorption amount of pollutants, ensure that the pollutants are not easy to enter the external atmosphere, protect the environmental quality, and improve the level of environmental governance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the desorbent injection device of the present invention;

[0019] Figure 2 This is a schematic diagram of the main structure of the removal agent injection device with a flue gas duct of the present invention;

[0020] Figure 3 is a top view of the stripping agent injection device;

[0021] Figure 4 It is a partial schematic diagram of the stripping agent guide plate;

[0022] Figure 5 It is a layout diagram of the removal agent injection device of the present invention installed on the flue plane;

[0023] Figure 6 The BB cross-sectional layout diagram of the descavenger injection device of the present invention installed on the flue plane;

[0024] Figure 7 This is an operation effect diagram of a desorbent injection device without a desorbent guide plate installed;

[0025] Figure 8 This is an operating effect diagram of the descavenger injection device of the present invention.

[0026] In the figure: 1- flue; 2- degassing agent inlet; 3- degassing agent spray gun flange plate; 4- degassing agent spray gun; 5- degassing agent outlet; 6- degassing agent guide plate; 7- spray pipe; 8- bolt. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-2 and Figure 5 As shown, the desulfurizing agent injection device of the present invention comprises a flue 1, in which flue gas flows, and the flue gas flows from front to back. A desulfurizing agent spray gun 4 is arranged in the flue 1, and the desulfurizing agent spray gun 4 comprises a desulfurizing agent inlet 2 at the upper end, a desulfurizing agent spray gun flange plate 3 fixed by bolts 8, a desulfurizing agent outlet 5 arranged at the lower end of a number of desulfurizing agent spray guns 4, and a desulfurizing agent guide plate 6 welded to the outside of the nozzle 7 of the desulfurizing agent spray gun 4 through a bracket. The length of the desulfurizing agent guide plate 6 perpendicular to the flue 1 is (n+1) / n of the length of the longest nozzle 7, where n is the number of desulfurizing agent nozzles 7.

[0029] like Figure 5 As shown, the descavenger spray gun 4 is vertically inserted into the flue 1 at a distance, and the spacing distance depends on the cross-sectional area of ​​the flue 1, which is generally 50mm to 200mm, and the bottom of the descavenger spray gun 4 is at a certain distance from the bottom of the flue 1, which is generally the difference in length between two adjacent nozzles 7. Although the length of each nozzle 7 is different, its length can form an arithmetic progression, so the difference is fixed.

[0030] The direction of the flue gas is perpendicular to the setting direction of the degassing agent spray gun 4, such as Figure 6 shown.

[0031] like Figure 7-Figure 8 As shown, compared Figure 7 In the ordinary degassing agent spray gun 4 without the degassing agent guide plate 6 and the diameter change, the degassing agent on the left side is less than that on the right side, and no turbulent zone is formed in the middle, which proves that the diffusion is not perfect, the area is small, and the subsequent diffusion distribution effect is much different from that of the degassing agent spray gun 4 of the present invention. Figure 8 The dual effects of the removal agent guide plate 6 installed in the middle and the height change of the nozzle 7 ensure that the outflow of the removal agent is uniform and diffused over a large area, forming a negative pressure area on the baffle side to ensure full contact with the pollutants in the flue 1, forming a turbulent area in the middle of the flue 1, improving the absorption effect of pollutants, ensuring that pollutants are not easy to enter the external atmosphere, protecting the environmental quality, and improving the level of environmental governance.

[0032] like Figure 2 As shown, the working principle of the descavenger injection device of the present invention is as follows:

[0033] The remover can be a powdered adsorbent such as activated carbon, activated coke, charcoal, carbon black, coke, fly ash, alumina, zeolite, bentonite, etc., or a solid powdered absorbent such as urea, NaHCO3, Na2CO3, Ca(OH)2, quicklime, limestone, alkali metal and alkaline earth metal oxides, or a mixture of several of the above substances.

[0034] Solid desorbent and other solid substances enter the desorbent inlet 2 in the desorbent spray gun flange plate 3 along the air transported by the compressed air pipeline. After passing through a section of the front end of the spray gun 7 without an outlet, the solid desorbent enters the spray gun 7 from the inlet and meets the compressed air sprayed from the front end in the spray gun 7. The solid desorbent particles are fully mixed under the action of the gas phase and then enter the flue 1 from the desorbent outlet 5. A desorbent guide plate 6 is welded outside the spray gun 7 of the desorbent spray gun 3 through a bracket, such as Figure 4 As shown, the extended width in the present invention is the radius of the semicircle of the degassing agent guide plate 6. The semicircle of the degassing agent guide plate 6 guides the flue gas to both sides to avoid direct contact and friction with the degassing agent spray gun 4, which causes physical corrosion. If there is no degassing agent guide plate 6, the flue gas directly acts on the pipe wall of the degassing agent spray gun 4 to generate pressure. The sprayed degassing agent is reduced due to the pressure on both sides, resulting in uneven spraying and diffusion of the degassing agent, which affects the degassing agent effect. Among them, the existence of the degassing agent guide plate 6 can guide the flue gas directly acting on the degassing agent spray gun 4 to flow to both sides, forming a low-pressure area, reducing its influence on the degassing agent injection trajectory, expanding the injection cross-sectional area, so that the degassing agent can cover the entire flow surface of the entire flue gas transportation, and ensure the removal effect. In order to ensure the diffusion effect of the degassing agent, and the degassing agent spray gun 4 has multiple nozzles 7, it is necessary to set the height of the multiple nozzles 7 according to the height of the flue, so that it diffuses evenly and each cross section of the flue can be covered by the degassing agent.

[0035] The present invention arranges the remover outlet 5 at the bottom of the nozzle 7, so it can be applied to flues with a large flue gas velocity and a large cross-sectional area. In addition, the present invention has a relatively simple structure and a relatively low manufacturing cost.

[0036] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flange-type inlet pollutant solid removal agent injection device, characterized in that: It includes a desulfurizer inlet, a desulfurizer spray gun flange plate, a desulfurizer spray gun, a desulfurizer outlet, and a desulfurizer guide plate, wherein the desulfurizer spray gun is composed of a nozzle, the total number of the nozzles is n and n≥2, the desulfurizer spray gun flange plate is fixedly arranged on the upper part of the desulfurizer spray gun by bolts, the desulfurizer inlet is arranged on the top of the desulfurizer spray gun, the desulfurizer outlet is arranged on the bottom of the desulfurizer spray gun, the desulfurizer guide plate is Ω-shaped, with flat wing parts extending to both sides, longitudinally welded to the desulfurizer spray gun through a bracket, and the desulfurizer spray gun is vertically inserted into the flue; wherein the solid desulfurizer and other solid substances enter the desulfurizer spray gun flange along the air transported by the compressed air pipeline The degassing agent inlet in the plate passes through a section of the front end of the degassing agent spray gun without an outlet, and the solid degassing agent enters the degassing agent spray gun from the inlet and meets the compressed air sprayed from the front end in the degassing agent spray gun. The solid degassing agent particles are fully mixed under the action of the gas phase and then enter the flue from the degassing agent outlet; the extended width is the radius of the semicircle of the degassing agent guide plate, and the flue gas is guided to both sides by the action of the semicircle of the degassing agent guide plate, and the degassing agent guide plate is also used to guide the flue gas directly acting on the degassing agent spray gun to flow to both sides, forming a low-pressure area, reducing its influence on the degassing agent injection trajectory, and expanding the injection cross-sectional area, so that the degassing agent can cover the entire flow surface of the entire flue gas transportation.

2. The flange-type inlet pollutant solid removal agent injection device according to claim 1 is characterized in that: The width of the flat wing portion of the stripper guide plate is 1 to 2 times the radius corresponding to the semicircle of the stripper guide plate.

3. According to the flange-type inlet pollutant solid removal agent injection device of claim 1, the diameter of the nozzle is 1.0 cm to 10.0 cm.

4. The flange-type inlet pollutant solid removal agent injection device according to claim 1 is characterized in that: The nozzle interval is 0.5 to 2 m.

5. The flange-type inlet pollutant solid removal agent injection device according to claim 1 is characterized in that: The longest length of the nozzle is 50% to 80% of the total height of the flue.

6. The flange-type inlet pollutant solid removal agent injection device according to claim 1 is characterized in that: The distance between the bottom of the descavenger spray gun and the bottom of the flue is the difference in length between two adjacent spray pipes.

7. The flange-type inlet pollutant solid removal agent injection device according to claim 1 is characterized in that: The number of the nozzles is n=5.

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