Corrosion-resistant desulfurizing agent spraying device capable of being overhauled on line and using method of corrosion-resistant desulfurizing agent spraying device

Abstract

The invention belongs to the technical field of flue gas desulfurization, and particularly relates to a corrosion-resistant desulfurizing agent spraying device capable of being overhauled on line and a using method thereof. Comprising a flue gas pipeline, a plurality of sleeves are obliquely fixed to the flue gas pipeline in a penetrating mode, marble valves are installed on the sleeves, an annular baking soda bustle pipe is fixed to the flue gas pipeline through a support, the baking soda bustle pipe is obliquely communicated with a plurality of branch pipes corresponding to the sleeves in number, and each branch pipe is sequentially connected with a first ball valve, a flexible connector, a second ball valve, a spray gun and a spray head. The baking soda bustle pipe is communicated with a feeding pipe, and a feeding valve is installed on the feeding pipe. According to the invention, multi-point injection can be realized, the desulfurization efficiency of baking soda is improved from 68% to 75-80%, and the four uniformly arranged injection positions are inserted in the direction of 45 degrees, so that uniform injection is realized, and local over-injection is prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue gas desulfurization, and particularly relates to a corrosion-resistant desulfurizer injection device capable of online maintenance and its usage method. Background Art

[0002] Sodium-based desulfurization is an important desulfurization process for flue gas, and the desulfurizer used is baking soda. After being ground and screened, the part that meets the particle size requirements is pneumatically conveyed and sprayed into the flue gas containing sulfur dioxide through a nozzle. After heating, baking soda decomposes to produce sodium carbonate, and sodium carbonate reacts with sulfur dioxide in the flue gas to produce sodium sulfite. Sodium sulfite is further oxidized and finally forms stable sodium sulfate, thereby reducing the sulfur dioxide in the flue gas.

[0003] In the sodium-based desulfurization process, on the premise of ensuring the quality of baking soda, there are two key factors affecting the desulfurization efficiency: (1) The reaction contact time between the desulfurizer and the flue gas. The longer the contact time and the more sufficient the contact, the higher the desulfurization efficiency. (2) The higher the flue gas temperature, the relatively higher the desulfurization efficiency. When the main desulfurization process and the flue gas system have been determined, improving the contact time between the flue gas and the desulfurizer is a relatively effective way to improve the desulfurization efficiency.

[0004] Currently, the injection of desulfurizer in sodium-based desulfurization is mainly single-pipe injection, which causes over-spray of desulfurizer in some areas and a lower desulfurizer concentration in other areas, affecting the desulfurization effect; the desulfurizer nozzle is in an acidic gas environment for a long time, which is easy to cause nozzle corrosion and affects the safe and efficient operation of the desulfurization process; when the spray gun has a working abnormality, it cannot be replaced online and needs to stop production for replacement; the spray gun and the injection main pipe are integrated, and when replacing the spray gun, the workload is large and the time is long, etc. Summary of the Invention

[0005] The purpose of the present invention is to provide a corrosion-resistant desulfurizer injection device capable of online maintenance and its usage method to solve the problems existing in the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A corrosion-resistant desulfurizer injection device capable of online maintenance includes a flue gas pipeline, on which several sleeves are fixedly penetrated obliquely. A ball valve is installed on the sleeve. The flue gas pipeline is fixed with an annular baking soda pipe through a bracket. Several branch pipes corresponding to the number of sleeves are connected obliquely to the baking soda pipe. The branch pipes are successively connected with a first ball valve, a flexible connection, a second ball valve, a spray gun, and a nozzle. An inlet pipe is connected to the baking soda pipe, and an inlet valve is installed on the inlet pipe.

[0008] Further, the inclination angle of the sleeve is 45 degrees, and the number of sleeves is four.

[0009] Further, the flue gas pipe passes through the circular structure of the baking soda surrounding pipe, and the inclination angle of the branch pipe is the same as that of the sleeve.

[0010] Further, the nozzle is made of ceramic.

[0011] A method for using a corrosion-resistant desulfurizer injection device that can be overhauled online includes the following steps:

[0012] (1) Normal use: Open the feed valve, and the material in the feed pipe enters the baking soda surrounding pipe. Insert the nozzle into the flue gas pipe through the ball valve. During this process, the ball valve automatically opens and clamps the spray gun. After sequentially opening the first ball valve and the second ball valve, the material in the baking soda surrounding pipe is sprayed into the flue gas pipe;

[0013] (2) Online replacement: First, close the first ball valve, then close the second ball valve, then pull out the spray gun. The ball valve automatically cuts off the flue gas. After replacing the damaged parts, install and use them according to step (1);

[0014] (3) Online backwashing: During normal use, sequentially close the first ball valve and the second ball valve. Disconnect the flexible connection from the second ball valve, open the second ball valve for backwashing. After backwashing is completed, close the second ball valve, connect the flexible connection to the second ball valve, and then resume the normal use state according to step (1).

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention can achieve multi-point spraying, increasing the desulfurization efficiency of baking soda from 68% to 75 - 80%. The four evenly arranged spraying positions are inserted at a 45° angle, thus achieving uniform spraying and preventing local overspray.

[0017] 2. If the spray gun or nozzle is damaged or malfunctioning, the damaged parts can be replaced online without the need to stop production for replacement, avoiding affecting the production progress.

[0018] 3. The baking soda nozzles in the prior art are mainly made of iron materials. The desulfurization environment is an acidic environment, which severely corrodes the nozzles. By using nozzles made of ceramic materials, the corrosion of the nozzles by flue gas can be eliminated, thereby increasing the service life of the nozzles and reducing the number of nozzle replacements.

[0019] 4. The spray gun (nozzle) is backwashed online to solve the problem of blockage of the spray gun (nozzle), thus avoiding the blockage of the spray gun (nozzle) from affecting production. Description of the Drawings

[0020] Figure 1 It is a schematic cross-sectional structure diagram of the present invention in the radial direction of the flue gas pipe.

[0021] Figure 2It is a schematic structural diagram of the axial section of the flue gas pipeline in the present invention.

[0022] Wherein: 1. Flue gas pipeline; 2. Bracket; 3. Baking soda surrounding pipe; 4. Branch pipe; 5. First ball valve; 6. Flexible connection; 7. Second ball valve; 8. Spray gun; 9. Ball valve; 10. Nozzle; 11. Sleeve; 12. Feed pipe; 13. Feed valve. Specific embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further elaborates on the present invention in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] Embodiment 1:

[0025] As Figure 1-2 shown, a corrosion-resistant desulfurizer injection device that can be repaired online includes a flue gas pipeline 1. A number of sleeves 11 are fixedly penetrated obliquely on the flue gas pipeline 1. A ball valve 9 is installed on the sleeve 11. The flue gas pipeline 1 is fixed with an annular baking soda surrounding pipe 3 through a bracket 2. A number of branch pipes 4 corresponding to the number of sleeves 11 are connected obliquely to the baking soda surrounding pipe 3. The branch pipes 4 are successively connected with a first ball valve 5, a flexible connection 6, a second ball valve 7, a spray gun 8, and a nozzle 10. A feed pipe 12 is connected to the baking soda surrounding pipe 3, and a feed valve 13 is installed on the feed pipe 12. The flexible connection 6 can be connected by a hose. Its function is to be disassembled during backwashing and can play a buffering role to prevent the branch pipe 4 from breaking due to the shaking of the spray gun 8 during spraying.

[0026] The inclination angle of the sleeve 11 is 45 degrees, and the number of sleeves 11 is four. The design of 45 degrees can change the flow field of baking soda and flue gas. Compared with vertical spraying, it can improve the mixing efficiency, thereby improving the desulfurization efficiency, and reducing the flow resistance of the flue gas.

[0027] The flue gas pipeline 1 passes through the annular structure of the baking soda surrounding pipe 3, and the inclination angle of the branch pipe 4 is the same as that of the sleeve 11.

[0028] The material of the nozzle 10 is ceramic. The ceramic nozzle 10 is corrosion-resistant and wear-resistant, thus solving the problem of the nozzle 10 being corroded, and its wear resistance improves the service life of the nozzle 10.

[0029] Embodiment 2: This embodiment provides a use method of a corrosion-resistant desulfurizer injection device that can be repaired online. The method steps are implemented based on Embodiment 1.

[0030] A use method of a corrosion-resistant desulfurizer injection device that can be repaired online includes the following steps:

[0031] (1) Normal use: Open the feed valve 13, and the materials in the feed pipe 12 enter the baking soda surrounding pipe 3. Insert the spray head 10 into the flue gas duct 1 through the ball valve 9. During this process, the ball valve 9 automatically opens and clamps the spray gun 8. After successively opening the first ball valve 5 and the second ball valve 7, the materials in the baking soda surrounding pipe 3 are sprayed into the flue gas duct 1;

[0032] (2) Online replacement: First, close the first ball valve 5, then close the second ball valve 7, then pull out the spray gun 8. The ball valve 9 automatically cuts off the flue gas. After replacing the damaged parts, install and use them according to step (1);

[0033] (3) Online backwashing: During normal use, successively close the first ball valve 5 and the second ball valve 7. Disconnect the flexible connection 6 from the second ball valve 7, open the second ball valve 7 for backwashing. After the backwashing is completed, close the second ball valve 7, connect the flexible connection 6 to the second ball valve 7, and then resume the normal use state according to step (1).

[0034] The working principle of the present invention:

[0035] When the present invention is used, it can realize the multi-point spraying of the flue gas in the flue gas duct 1 from the baking soda surrounding pipe 3, improving the desulfurization efficiency of baking soda. The four evenly arranged spraying positions (the positions of the sleeves 11) are inserted at a 45° angle, so as to achieve uniform spraying, prevent local overspray, and can change the flow field of baking soda and flue gas. Compared with vertical spraying, the reaction contact time between the desulfurizer and the flue gas is long and the contact is sufficient, thereby improving the mixing efficiency, further improving the desulfurization efficiency, and reducing the flow resistance of the flue gas.

[0036] If the spray gun 8 or the spray head 10 is damaged or malfunctions, the damaged parts can be replaced online. For the blockage problem of the spray gun 8 (spray head 10), the flue gas pressure in the flue gas duct 1 is used for online backwashing of the spray gun 8 (spray head 10), thereby solving the blockage problem of the spray gun 8 (spray head 10).

[0037] Currently, the baking soda spray head 10 is mainly made of iron materials, and the desulfurization environment is an acidic environment, which seriously corrodes the spray head 10. By using a spray head 10 made of ceramic materials, the corrosion of the spray head 10 by the flue gas can be eliminated, the service life of the spray head 10 can be extended, and the replacement frequency of the spray head 10 can be reduced.

[0038] The above embodiments only describe the preferred implementation modes of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various variations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope of the present invention.

[0039] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. An online-maintainable corrosion-resistant desulfurizer injection device, characterized in that It includes a flue gas pipeline, on which several sleeves are fixedly penetrated obliquely. A ball valve is installed on each sleeve. The flue gas pipeline is fixedly provided with an annular baking soda surrounding pipe through a bracket. Several branch pipes corresponding to the number of sleeves are communicated obliquely on the baking soda surrounding pipe. The branch pipes are sequentially connected with a first ball valve, a flexible connection, a second ball valve, a spray gun, and a spray head. An inlet pipe is communicated on the baking soda surrounding pipe, and an inlet valve is installed on the inlet pipe.

2. The corrosion-resistant desulfurization agent injection device capable of online maintenance according to claim 1 is characterized in that: The inclination angle of the sleeve is 45 degrees, and the number of sleeves is four.

3. The corrosion-resistant desulfurization agent injection device capable of online maintenance according to claim 2 is characterized in that: The flue gas pipeline passes through the annular structure of the baking soda surrounding pipe, and the inclination angle of the branch pipe is the same as that of the sleeve.

4. The corrosion-resistant desulfurizer injection device capable of online maintenance according to claim 1, wherein The material of the spray head is ceramic.

5. The usage method of a corrosion-resistant desulfurizer injection device capable of online maintenance according to claims 1-4, characterized in that, It includes the following steps: (1) Normal use: Open the inlet valve, and the material in the inlet pipe enters the baking soda surrounding pipe. Insert the spray head into the interior of the flue gas pipeline through the ball valve. During this process, the ball valve automatically opens and clamps the spray gun. After sequentially opening the first ball valve and the second ball valve, the material in the baking soda surrounding pipe is sprayed into the flue gas pipeline. (2) Online replacement: First, close the first ball valve, then close the second ball valve, then pull out the spray gun. The ball valve automatically cuts off the flue gas. After replacing the damaged parts, install and use them according to step (1). (3) Online backwashing: During normal use, sequentially close the first ball valve and the second ball valve. Disconnect the flexible connection from the second ball valve, open the second ball valve for backwashing. After backwashing is completed, close the second ball valve, connect the flexible connection to the second ball valve, and then restore to the normal use state according to step (1).

Images