An ammonia pre-spraying device for an active coke desulfurization and denitrification regeneration tower

Abstract

The utility model provides a kind of active coke desulfurization and denitrification regeneration tower pre-ammonia spraying device, including regeneration tower body, the outside wall of regeneration tower body is provided with inlet pipe, the air outlet end of inlet pipe extends to the below of the feed opening of regeneration tower body, for into ammonia gas in active coke falling path, the air inlet end of inlet pipe is connected with control component, control component is used to control ammonia gas intake before entering inlet pipe, the utility model is equipped with inlet pipe below the feed opening of regeneration tower body, ammonia gas is passed to active coke falling path in advance, so that it adheres surface to complete pre-ammonia spraying pretreatment, change traditional adsorption tower directly ammonia spraying mode, avoid ammonia gas escape, improve denitrification efficiency, reduce ammonia water consumption and environmental protection risk.

Description

Technical Field

[0001] This utility model relates to the field of integrated desulfurization and denitrification technology of activated coke, specifically to a pre-ammonia injection device for an activated coke desulfurization and denitrification regeneration tower. Background Technology

[0002] Activated coke desulfurization and denitrification is a dry integrated flue gas treatment technology based on the porous adsorption characteristics and catalytic performance of activated coke (or activated carbon). It can simultaneously remove sulfur dioxide (SO2) and nitrogen oxides (NOx) from flue gas. x This will enable the recycling and utilization of sulfur resources.

[0003] In traditional processes, ammonia gas is directly injected into the adsorption tower (or denitrification reactor) to react with NO in the flue gas. x Selective catalytic reduction (SCR) occurs on the surface of activated coke, achieving simultaneous removal of pollutants (i.e., desulfurization and denitrification).

[0004] However, traditional processes involving ammonia injection into the adsorption tower not only lead to high ammonia escape (but also require increasing the ammonia injection rate to control NO within the adsorption tower), but also... x The data may show issues such as excessive nitrogen injection, indirectly increasing ammonia escape, ammonium sulfate crystallization clogging the grid (existing ammonia reacts with sulfur to form ammonium sulfate crystals), equipment overheating risk (ammonium sulfate crystals accumulate in the adsorption tower grid or activated coke gaps, causing tower resistance to increase and leading to overheating of some airflow ends and equipment), and will also cause ammonia waste and significant environmental risks (increasing the ammonia injection rate leads to increased ammonia consumption). Utility Model Content

[0005] In view of this, the present invention provides a pre-ammonia injection device for activated coke desulfurization and denitrification regeneration tower. By setting an air inlet pipe below the feed inlet of the regeneration tower body, ammonia gas is introduced into the path of activated coke in advance, so that the surface to which it adheres is pre-treated by ammonia injection. This changes the traditional method of directly injecting ammonia into the adsorption tower, avoids ammonia escape, improves denitrification efficiency, and reduces ammonia water consumption and environmental risks.

[0006] To solve the above-mentioned technical problems, this utility model provides a pre-ammonia injection device for an activated coke desulfurization and denitrification regeneration tower, including a regeneration tower body, an air inlet pipe fixedly connected to the outer wall of the regeneration tower body, and the air outlet of the air inlet pipe extending to below the feed inlet of the regeneration tower body for introducing ammonia gas into the path of activated coke falling.

[0007] The inlet end of the inlet pipe is connected to a control component, which is used to control the amount of ammonia gas entering the inlet pipe. One end of the control component is connected to the ammonia gas pipeline through a flange, which is used to pass ammonia gas into the control component. After being regulated by the control component, the ammonia gas enters the regeneration tower body through the inlet pipe to pre-treat the activated coke.

[0008] The control components include a regulating valve installed at one end of the ammonia pipeline to regulate the amount of ammonia entering. The regulating valve is a pneumatic regulating valve, which facilitates control of the valve opening. The pneumatic regulating valve is a Fisher 657GP model regulating valve, used to achieve high-precision control of ammonia.

[0009] A flow meter is installed between the regulating valve and the intake pipe to monitor the regulating valve and prevent abnormal flow caused by valve failure.

[0010] An electric heat tracing layer is installed inside the wall of the intake pipe. The electric heat tracing layer includes a spirally wound heating wire and an insulating layer wrapped around the outside of the heating wire, which is used to prevent ammonia gas from condensing or crystallizing and clogging the intake pipe.

[0011] The outlet end of the inlet pipe is equipped with a gas diffusion nozzle to form a uniform ammonia gas injection cone surface, thereby improving the pretreatment effect on activated coke. The opening direction of the gas diffusion nozzle is set towards the direction of activated coke falling, which increases the contact area between ammonia gas and activated coke, and further improves the utilization efficiency of ammonia gas.

[0012] The regeneration tower body is equipped with discharge valves at both the inlet and outlet to control the feeding and discharging speed and amount of activated coke. The discharge valves are planetary discharge valves, which can be used to discharge activated coke with solid structure.

[0013] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0014] 1. Improve activated coke denitrification efficiency and reduce ammonia escape risk: By setting an air inlet pipe below the feed inlet of the regeneration tower body, ammonia is introduced into the path of activated coke in advance, so that the ammonia adheres to the surface of the activated coke before it enters the adsorption tower. This achieves pre-treatment of activated coke with ammonia injection, which changes the traditional method of directly injecting ammonia into the adsorption tower. This avoids the ammonia escape problem caused by excessive ammonia injection in the adsorption tower. At the same time, the ammonia modification enhances the catalytic activity sites on the surface of activated coke, significantly improving the denitrification reaction efficiency and reducing ammonia water consumption and environmental risks from the source.

[0015] 2. Precise control of ammonia flow rate to ensure system stability: The pneumatic regulating valve (such as the Fisher 657GP model) in the control component can achieve high-precision dynamic adjustment of ammonia flow rate, quickly respond to process requirements and adapt to flammable and explosive environments, avoiding the safety hazards of electric sparks; in conjunction with the flow meter between the regulating valve and the inlet pipe, the ammonia flow rate is monitored in real time and fed back to the control system. When valve failure or other abnormalities occur, an alarm is triggered in time and the protection mechanism is activated to ensure stable ammonia supply and prevent problems such as equipment overheating and reaction efficiency fluctuations caused by abnormal flow.

[0016] 3. Prevent pipe blockage and ensure continuous system operation: The electric heat tracing layer on the inner wall of the air inlet pipe maintains a stable temperature inside the pipe through the design of spiral heating wire and insulation layer. This effectively prevents ammonia from condensing due to low temperature or reacting with sulfur components to crystallize, avoiding the risk of gas supply interruption caused by pipe blockage and ensuring the continuity and reliability of the pre-spraying ammonia process.

[0017] 4. Optimize ammonia distribution and enhance gas-solid contact: The gas diffusion nozzle at the outlet is set towards the direction of activated coke falling, forming a uniform spray cone (such as a fan-shaped spray), realizing countercurrent contact between ammonia and activated coke; this not only expands the ammonia coverage area, prolongs the gas-solid contact time, and improves the ammonia adsorption efficiency on the activated coke surface, but also uses the falling activated coke to flush the nozzle surface, reducing the risk of nozzle blockage caused by ammonium sulfate crystal deposition, and further improving the stability of system operation.

[0018] 5. Precise control of activated coke material flow to improve process safety: The planetary discharge valves at the inlet and outlet of the regeneration tower body effectively control the feeding and discharging speed of activated coke through a multi-blade, multi-stage sealing structure, ensuring that the material residence time in the tower meets the process requirements, while preventing ammonia gas from leaking from the inlet and outlet.

[0019] 6. Reduce equipment failure and maintenance costs: By pre-treating activated coke with ammonia, the amount of ammonium sulfate crystals generated in the adsorption tower is reduced, thereby reducing grid blockage and tower resistance increase, which in turn reduces the risk of equipment overheating and subsequent maintenance frequency. At the same time, the coordinated design of various components (such as pneumatic regulating valves, flow meters, electric heat tracing layers, etc.) improves the level of system automation control, reduces human intervention and operational errors, and reduces the overall equipment failure rate and long-term operating costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of a partial component structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of each component at both ends of the air intake pipe of this utility model.

[0023] In the diagram: 101, regeneration tower body; 102, inlet pipe; 103, ammonia pipeline; 104, regulating valve; 105, flow meter; 106, gas diffusion nozzle; 107, unloading valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-3The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0025] A pre-ammonia injection device for an activated coke desulfurization and denitrification regeneration tower, such as Figure 1 As shown: It includes a regeneration tower body 101, and an air inlet pipe 102 is fixedly connected to the outer wall of the regeneration tower body 101. The air outlet of the air inlet pipe 102 extends to below the feed inlet of the regeneration tower body 101, and is used to introduce ammonia into the falling path of activated coke, so that the ammonia can pre-treat the activated coke. The air inlet pipe 102 can spray ammonia in advance below the feed inlet of the regeneration tower body 101, so that the ammonia adheres to the surface of the activated coke, improves the performance of the activated coke, and further improves the denitrification efficiency of the activated coke.

[0026] A control component is connected to the inlet end of the inlet pipe 102. The control component is used to control the amount of ammonia gas entering the inlet pipe 102. One end of the control component is connected to the ammonia gas pipeline 103 through a flange, which is used to introduce ammonia gas into the control component through the ammonia gas pipeline 103. An ammonia gas storage tank is connected to one side of the ammonia gas pipeline 103. After being regulated by the control component, the ammonia gas enters the regeneration tower body 101 through the inlet pipe 102 to pretreat the activated coke.

[0027] like Figure 2 , 3 As shown: The control component includes a regulating valve 104 installed at one end of the ammonia pipeline 103, which is used to regulate the amount of ammonia entering. The regulating valve 104 can precisely control the ammonia flow rate entering the regeneration tower body 101, ensuring the stability and efficiency of activated coke in the desulfurization and denitrification pretreatment process. By adjusting the valve opening, the amount of ammonia can be dynamically adjusted according to actual production needs.

[0028] The regulating valve 104 is a pneumatic regulating valve, which facilitates the control of the valve opening. Using a pneumatic regulating valve, the valve can quickly respond to control signals and achieve precise adjustment of the valve opening, meeting the real-time control requirements of ammonia flow in the desulfurization and denitrification process. It is also suitable for flammable and explosive ammonia environments, requires no power supply, and avoids the safety hazards caused by electric sparks. The pneumatic regulating valve 104 uses Fisher 657GP model to achieve high-precision control of ammonia and ensure a stable ammonia supply.

[0029] It is worth mentioning that a flow meter 105 is installed between the regulating valve 104 and the inlet pipe 102 to monitor the regulating valve 104 and prevent abnormal flow caused by the failure of the regulating valve 104 (i.e., real-time monitoring of ammonia flow to provide feedback data for the control system). When the flow is abnormal (such as excessive or insufficient flow caused by the failure of the regulating valve 104), an alarm can be set in time and the protection mechanism can be triggered to prevent production accidents. The flow meter 105 can also display the total amount of ammonia injected, which can be observed in real time by the staff and timely adjustments can be made according to actual needs.

[0030] like Figure 2 As shown: The wall of the inlet pipe 102 is provided with an electric heat tracing layer, which includes a spirally wound heating wire and an insulating layer wrapped around the outer wall of the heating wire. This layer is used to prevent ammonia from condensing or crystallizing and blocking the inlet pipe 102, thereby further increasing the rate at which ammonia enters the regeneration tower body 101 through the inlet pipe 102.

[0031] like Figure 2 , 3 As shown: A gas diffusion nozzle 106 is provided at the outlet end of the inlet pipe 102 to form a uniform ammonia gas injection cone (forming a large coverage area and uniform concentration injection cone), thereby increasing the contact area and reaction efficiency between ammonia and activated coke, and further improving the pretreatment effect on activated coke. The gas diffusion nozzle 106 uses a fan-shaped nozzle, and the angle of the gas diffusion nozzle 106 can be adjusted before or after installation (i.e., adjusted by the ball head on the fan-shaped nozzle). The opening direction of the gas diffusion head is set towards the direction of activated coke falling, increasing the contact area between ammonia and activated coke, and further improving the utilization efficiency of ammonia. This achieves countercurrent contact: activated coke and ammonia are fully mixed in the countercurrent flow, prolonging the contact time; and prevents clogging: the falling activated coke can wash the nozzle surface, reducing the risk of crystal deposition.

[0032] like Figure 1 , 2 As shown: The inlet and outlet of the regeneration tower body 101 are both equipped with discharge valves 107, which are used to control the feeding and discharging speed and amount of activated coke, that is, to precisely adjust the feeding and discharging speed of activated coke, ensure that the material residence time in the regeneration tower body 101 meets the process requirements, and prevent ammonia from leaking from the inlet and outlet (that is, when the two discharge valves 107 are closed), thus ensuring production safety.

[0033] The unloading valve 107 adopts a planetary unloading valve, which can unload activated coke with solid structure. It adopts a multi-blade design to achieve multi-stage sealing, and can also control the speed of the variable frequency motor through the characteristics of the planetary unloading valve to meet the requirements of precise feeding.

[0034] During operation, the ammonia injection flow rate is controlled by regulating valve 104, allowing the ammonia to be adsorbed on the surface of the activated coke and enter the regeneration tower body 101 together. The amount of ammonia injected is adjusted according to the total ammonia injection amount for denitrification (which can be seen through flow meter 105) and the NOx data at the feed inlet (which can be detected by ultraviolet differential absorption spectrometer). During the operation of the regeneration tower body 101, the ammonia adheres to the surface of the activated coke, improving the performance of the activated coke and further improving the desulfurization and denitrification efficiency of the activated coke. Specifically, during the heating process of the regeneration tower body 101, oxygen-containing functional groups such as carbonyl groups decompose, and the ammonia generated by the decomposition of ammonium sulfate combines with carbon atoms to form active sites. The injected ammonia combines with carbon atoms to form new active sites, thus modifying the surface of the activated coke with ammonia.

[0035] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A pre-ammonia injection device for an activated coke desulfurization and denitrification regeneration tower, characterized in that: The regeneration tower body (101) includes an air inlet pipe (102) on the outer side wall of the regeneration tower body (101), and the air outlet of the air inlet pipe (102) extends to the bottom of the feed inlet of the regeneration tower body (101) for introducing ammonia into the path of activated coke. The intake end of the intake pipe (102) is connected to a control component, which is used to control the amount of ammonia gas entering the intake pipe (102). One end of the control component is connected to the ammonia pipeline (103).

2. The pre-ammonia injection device for the activated coke desulfurization and denitrification regeneration tower as described in claim 1, characterized in that: The control component includes a regulating valve (104) installed at one end of the ammonia pipeline (103) for controlling the amount of ammonia entering.

3. The pre-ammonia injection device for the activated coke desulfurization and denitrification regeneration tower as described in claim 2, characterized in that: The regulating valve (104) is a pneumatic regulating valve, which facilitates the control of the valve opening.

4. The pre-ammonia injection device for the activated coke desulfurization and denitrification regeneration tower as described in claim 1 or 2, characterized in that: A flow meter (105) is installed between the control component and the air intake pipe (102) to prevent abnormal flow caused by a malfunction of the control valve (104).

5. The pre-ammonia injection device for the activated coke desulfurization and denitrification regeneration tower as described in claim 4, characterized in that: An electric heat tracing layer is provided inside the wall of the air inlet pipe (102). The electric heat tracing layer includes a spirally wound heating wire and an insulating layer wrapped around the outside of the heating wire, which is used to prevent ammonia gas from condensing or crystallizing and blocking the air inlet pipe (102).

6. The pre-ammonia injection device for the activated coke desulfurization and denitrification regeneration tower as described in claim 5, characterized in that: The outlet end of the air inlet pipe (102) is provided with a gas diffusion nozzle (106) to form a uniform ammonia gas injection cone surface.

7. The pre-ammonia injection device for the activated coke desulfurization and denitrification regeneration tower as described in claim 6, characterized in that: The opening direction of the gas diffusion nozzle (106) is set towards the direction of the activated carbon falling.

8. The pre-ammonia injection device for the activated coke desulfurization and denitrification regeneration tower as described in claim 1, characterized in that: The inlet and outlet of the regeneration tower body (101) are both equipped with discharge valves (107) to control the feeding and discharging speed and amount of activated coke. The discharge valves (107) are planetary discharge valves.

Images