Device for removing ammonia in raw gas in process of producing hydrogen from coal
By designing a resistive wire and induction rod system at the water inlet of the ammonia washing tower, the ammonium salt crystals are automatically decomposed, which solves the problem of water inlet of the ammonia washing tower and achieves stable operation of the device.
Patent Information
- Application Number
- CN202422461499.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-10
AI Technical Summary
During the coal chemical production process, the ammonium ions in the ammonia water combine with the acid ions at room temperature to form ammonium salt crystals, resulting in the water inlet and outlet of the ammonia washing tower blocking, affecting the normal operation of the device.
Design a device for removing ammonia from waste coal gas through coal-to-hydrogen process. Using resistive wire and induction rod system, when the ammonium salt crystal is adsorbed on the filter screen and surrounding components, it pushes the sliding tube to move, generates heat and decomposes the ammonium salt crystals to ensure the normal operation of the water inlet.
Effectively decompose the ammonium salt crystals, prevent blockage, ensure the normal operation of the water inlet, avoid increasing water pressure and damage to the device, and improve the operating stability of the device.
Smart Images
Figure CN223159083U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal chemical industry, and particularly to a device for removing ammonia from raw coal gas in the process of coal hydrogen production. Background Technique
[0002] The main components of raw coal gas depend on its source. Coke oven raw coal gas mainly includes water vapor, tar vapor, crude benzene, ammonia, hydrogen sulfide, cyanide, etc. Blast furnace raw coal gas mainly includes carbon monoxide, carbon dioxide, nitrogen, hydrogen, methane, dust, etc. Raw coal gas contains components such as tar and benzene. Among them, nitrogen oxides will be produced when ammonia burns, polluting the environment. Therefore, it is necessary to carry out deammoniation treatment on raw coal gas. Harmful nitrogen oxides will be produced when ammonia burns. The ammonia content in coke oven crude gas is usually about 10 g / Nm³. The deammoniation methods are divided into two categories: producing concentrated ammonia water and producing ammonium sulfate. Producing concentrated ammonia water is to form dilute ammonia water after pure physical absorption by contacting water with coal gas under low temperature conditions, and then concentrating it into concentrated ammonia water; producing ammonium sulfate is to make ammonia contact with sulfuric acid aqueous solution (mother liquor) for chemical absorption to generate ammonium sulfate to achieve the separation of ammonia and coal gas. The method of directly contacting ammonia-containing crude coal gas with mother liquor to produce ammonium sulfate is called the direct method; using ammonia water concentrated vapor to contact with mother liquor to produce ammonium sulfate is the indirect method; the method of making both partial ammonia vapor and ammonia-containing crude coal gas contact with mother liquor to produce ammonium sulfate is the semi-direct method. The semi-direct method is mostly adopted at home and abroad. The semi-direct method is divided into two categories: producing ammonium sulfate without saturator and producing ammonium sulfate with saturator.
[0003] For the deammoniation treatment of raw coal gas, the raw coal gas passes through a gas-liquid separator and an ammonia scrubbing tower to reduce the ammonia in the raw coal gas from 1500 mg / m 3 to 100 mg / m 3 and then goes to the subsequent process. Most of the ammonia water in the ammonia scrubbing tower is circulated by an ammonia water circulation pump, and the other part enters the acid removal tower and the ammonia stripping tower. The ammonia stripped wastewater after ammonia cooking enters the lean liquid booster pump and then enters the ammonia scrubbing tower for circulation. The ammonia coming out of the ammonia stripping tower enters the lean liquid cooler for cooling and then enters the ammonia water storage tank for external delivery. Considering that when ammonia water enters the ammonia scrubbing tower by the ammonia water circulation pump, the ammonium ions in the ammonia water are prone to combine with acid radicals to form ammonium salt crystals at normal temperature, blocking the inlet and outlet of the ammonia scrubbing tower. According to the characteristic that ammonium salt crystals are easily decomposed by heat, therefore, we propose a device that can automatically clean the ammonium salt crystals at the inlet and outlet of the ammonia scrubbing tower, that is, a device for deammoniation of raw coal gas and by-product ammonia water in the process of coal chemical production. Content of the Utility Model
[0004] The purpose of the utility model is to provide a device for removing ammonia from raw coal gas in the process of coal hydrogen production to solve the problems raised in the above background technique.
[0005] To achieve the above object, the utility model provides a device for removing ammonia from raw coal gas in the coal-to-hydrogen process, which comprises a main body of an ammonia scrubbing tower. An inlet and an outlet are respectively and fixedly connected to the top and bottom of the main body of the ammonia scrubbing tower. A circular pipe is fixedly connected inside the inlet and the outlet. A cavity is formed inside the outer shell of the circular pipe. A resistance wire is fixedly connected to the rear end of the cavity. The other end of the resistance wire is fixedly connected to a power supply. An induction rod is fixedly connected to the front end of the power supply. A sliding pipe is slidably connected to the front end of the cavity. The structure of the sliding pipe is the same as that of the circular pipe, and the internal components are also connected in the same way. A filter screen is fixedly connected to the front end of the sliding pipe.
[0006] As a further improvement of the technical solution, a spring is fixedly connected to the front end of the power supply. The spring is sleeved outside the induction rod, and the other end of the spring contacts the sliding pipe.
[0007] As a further improvement of the technical solution, a clamping plate is slidably connected to the front end of the circular pipe. An inclined groove is formed on the upper surface of the sliding pipe, and the position of the inclined groove corresponds to that of the clamping plate.
[0008] As a further improvement of the technical solution, a rubber ring is fixedly connected to the rear end surface of the sliding pipe, and the rubber ring is in close fit with the inner surface of the circular pipe.
[0009] As a further improvement of the technical solution, a plurality of resistance wires are connected to both the top rear end and the bottom rear end of the circular pipe, and the sliding pipe adopts the same structure corresponding thereto.
[0010] As a further improvement of the technical solution, a plurality of fixing brackets are fixedly connected to the rear end of the circular pipe, and fixing holes are formed on the surfaces of the fixing brackets.
[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0012] When the device for removing ammonia from raw coal gas and by-producing ammonia water in the coal chemical production process is in use, since ammonium ions in ammonia water are likely to combine with acid radical ions to form ammonium salt crystals at normal temperature, the formed ammonium salt crystals are adsorbed on the filter screen and surrounding components. At this time, the water inlet will be blocked, resulting in an increase in the water pressure at the water inlet and an increase in the pressure received by the filter screen, thereby pushing the sliding pipe to move, promoting the contact between the induction rod in the sliding pipe and the induction rod in the circular pipe, thereby promoting the internal power supply to generate electricity and driving the resistance wire to generate heat, thereby promoting the temperature of the entire device to rise. Since ammonium salt crystals are easily decomposed by heat, the ammonium salt crystals on the filter screen and surrounding components are decomposed, ensuring the normal operation of the water inlet. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall circulation process structure of the utility model 1;
[0014] Figure 2Schematic diagram of the overall structure of the present utility model 1;
[0015] Figure 3 Schematic diagram of the filter device structure of the present utility model 1;
[0016] Figure 4 Schematic sectional view of the filter device of the present utility model 1;
[0017] Figure 5 Schematic sectional view of the sliding pipe of the present utility model 1;
[0018] Figure 6 Schematic diagram of the chute device structure of the present utility model 1.
[0019] The meanings of each label in the figure are as follows:
[0020] 1, Ammonia scrubbing tower body; 11, Water inlet; 12, Water outlet;
[0021] 2, Round pipe; 21, Cavity; 22, Resistance wire; 23, Power supply; 24, Induction rod; 25, Spring; 26, Fixed frame; 27, Clamping plate;
[0022] 3, Sliding pipe; 31, Filter screen; 32, Chute; 33, Rubber ring. Specific implementation mode
[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0024] The main components of raw coke oven gas depend on its source. Coke oven raw coke oven gas mainly includes water vapor, tar vapor, crude benzene, ammonia, hydrogen sulfide and cyanide, etc. While blast furnace raw coke oven gas mainly includes carbon monoxide, carbon dioxide, nitrogen, hydrogen, methane and dust, etc. Raw coke oven gas contains components such as tar and benzene, and nitrogen oxides will be generated when ammonia burns, polluting the environment. Please refer to Figures 1 - 6As shown in the figure, the utility model provides a device for removing ammonia from raw coal gas and by - producing ammonia water in the coal chemical production process, which includes the main body 1 of the ammonia scrubbing tower. The top and bottom of the main body 1 of the ammonia scrubbing tower are respectively fixedly connected with a water inlet 11 and a water outlet 12. A circular pipe 2 is fixedly connected inside the water inlet 11 and the water outlet 12. A cavity 21 is formed inside the outer shell of the circular pipe 2. A resistance wire 22 is fixedly connected to the rear end of the cavity 21. The other end of the resistance wire 22 is fixedly connected to a power supply 23. The front end of the power supply 23 is fixedly connected to an induction rod 24. A sliding pipe 3 is slidably connected to the front end of the cavity 21. The structure of the sliding pipe 3 is the same as that of the circular pipe 2, and the internal component connections are also the same. A filter screen 31 is fixedly connected to the front end of the sliding pipe 3.
[0025] The improvement of the present utility model lies in:
[0026] For the ammonia removal treatment of raw coal gas, as Figure 1 shown, the raw coal gas passes through a gas - liquid separator and an ammonia scrubbing tower to reduce the ammonia concentration in the raw coal gas, and then goes to the subsequent processes. Most of the ammonia water in the ammonia scrubbing tower is circulated by an ammonia water circulation pump, and the other part enters a deacidification tower and an ammonia distillation tower. The distilled ammonia wastewater after ammonia cooking enters a lean liquor booster pump and then enters the ammonia scrubbing tower for circulation. The ammonia coming out of the ammonia distillation tower enters a lean liquor cooler for cooling and then enters an ammonia water storage tank for external delivery. Considering that when the ammonia water enters the ammonia scrubbing tower by the ammonia water circulation pump, the ammonium ions in the ammonia water are likely to combine with acid - root ions to form ammonium salt crystals at normal temperature, which will cause blockage of the water inlet 11 and the water outlet 12 of the ammonia scrubbing tower. Therefore, when the ammonium salt crystals are adsorbed on the filter screen 31 and surrounding components, at this time, the water inlet 11 will be blocked, resulting in an increase in the water pressure at the water inlet 11. The pressure on the filter screen 31 increases, pushing the sliding pipe 3 to move, prompting the induction rod 24 in the sliding pipe 3 to contact the induction rod 24 in the circular pipe 2, thereby prompting the internal power supply 23 to generate electricity, driving the resistance wire 22 to heat up, and thus prompting the temperature of the entire device to rise, decomposing the ammonium salt crystals adsorbed on the filter screen 31 and surrounding components, so as to achieve the cleaning of the blockage of the water inlet 11.
[0027] Considering that the continuous discharge of the power supply 23 will cause waste of energy, therefore, a spring 25 is fixedly connected to the front end of the power supply 23. The spring 25 is sleeved outside the induction rod 24, and the other end of the spring 25 contacts the sliding pipe 3. When the ammonium salt crystals adsorbed on the filter screen 31 and surrounding components are decomposed, the water pressure at the water inlet 11 tends to be normal, the pressure on the filter screen 31 decreases, and under the action of the elastic force of the spring 25, the sliding pipe 3 is pushed outward, prompting the induction rods 24 in the circular pipe 2 and the sliding pipe 3 to separate from each other, so that the power supply 23 stops working.
[0028] To prevent the pressure on the filter screen 31 from suddenly decreasing after the ammonium salt crystal decomposes, causing the sliding tube 3 to separate from the front end of the circular tube 2, a clamping plate 27 is slidably connected to the front end of the circular tube 2. An inclined groove 32 is formed on the upper surface of the sliding tube 3, and the position of the inclined groove 32 corresponds to that of the clamping plate 27. The inclined surface of the inclined groove 32 faces outward. When the sliding tube 3 moves backward, the clamping plate 27 moves upward along the inclined surface. When the sliding tube 3 moves forward, the clamping plate 27 blocks the sliding tube 3 to prevent the sliding tube 3 from separating from the front end of the circular tube 2.
[0029] To prevent ammonia water from entering the cavity 21 of the circular tube 2 and damaging the power source 23, a rubber ring 33 is fixedly connected to the rear end surface of the sliding tube 3. The rubber ring 33 is in close fit with the inner surface of the circular tube 2. The rubber ring 33 has good sealing performance, thus ensuring that ammonia water will not enter the cavity 21 of the circular tube 2.
[0030] Considering the distance between the sliding tube 3 and the circular tube 2, to enable the temperature of the entire device to rise rapidly, a plurality of resistance wires 22 are connected to both the rear end of the top and the rear end of the bottom of the circular tube 2. The sliding tube 3 adopts the same structure to correspond to it. The plurality of resistance wires 22 work simultaneously to ensure that the temperature of the entire device rises rapidly, thereby rapidly decomposing the ammonium salt crystals adsorbed on the filter screen 31 and surrounding components.
[0031] To facilitate the fixing of the device at the water inlet 11, a plurality of fixing brackets 26 are fixedly connected to the rear end of the circular tube 2. Fixing holes are formed on the surface of the fixing brackets 26. By clamping and matching with the fixing holes on the surface of the fixing brackets 26 through nuts, the stability of the device is ensured, and the normal operation of the device is promoted.
[0032] In summary, the working principle of this solution is as follows:
[0033] The device is fixed at the water inlet 11 through the fixing brackets 26. When the ammonium salt crystals adsorbed on the filter screen 31 and surrounding components gradually increase, the water inlet 11 will be blocked at this time, resulting in an increase in the water pressure at the water inlet 11. The pressure on the filter screen 31 increases, pushing the sliding tube 3 to move, prompting the induction rod 24 in the sliding tube 3 to contact the induction rod 24 in the circular tube 2, thereby prompting the internal power source 23 to generate electricity, driving the resistance wires 22 to generate heat. The plurality of resistance wires 22 generate heat simultaneously, thus prompting the temperature of the entire device to rise rapidly, decomposing the ammonium salt crystals adsorbed on the filter screen 31 and surrounding components. After the ammonium salt decomposes, the water pressure at the water inlet 11 tends to normal, the pressure on the filter screen 31 decreases, and under the elastic force of the spring 25, the sliding tube 3 is pushed outward, prompting the induction rods 24 in the circular tube 2 and the sliding tube 3 to separate from each other, so that the power source 23 stops working, and the sliding tube 3 returns to the initial position.
[0034] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. An apparatus for removing ammonia from raw coal gas in a coal-to-hydrogen process, comprising a main body of an ammonia scrubbing tower (1), characterized in that: The top and bottom of the ammonia washing tower body (1) are respectively fixedly connected with a water inlet (11) and a water outlet (12). A circular pipe (2) is fixedly connected inside the water inlet (11) and the water outlet (12). A cavity (21) is formed inside the outer shell of the circular pipe (2). A resistance wire (22) is fixedly connected to the rear end of the cavity (21). The other end of the resistance wire (22) is fixedly connected to a power supply (23). A sensing rod (24) is fixedly connected to the front end of the power supply (23). A sliding pipe (3) is slidably connected to the front end of the cavity (21). The structure of the sliding pipe (3) is the same as that of the circular pipe (2), and the internal component connections are also the same. A filter screen (31) is fixedly connected to the front end of the sliding pipe (3).
2. The device for removing ammonia from raw coal gas in the coal-to-hydrogen process according to claim 1, characterized in that: A spring (25) is fixedly connected to the front end of the power supply (23). The spring (25) is sleeved outside the sensing rod (24), and the other end of the spring (25) contacts the sliding pipe (3).
3. The device for removing ammonia from raw coal gas in the coal-to-hydrogen process according to claim 1, wherein: A clamping plate (27) is slidably connected to the front end of the circular pipe (2). An inclined groove (32) is formed on the upper surface of the sliding pipe (3), and the position of the inclined groove (32) corresponds to that of the clamping plate (27).
4. The device for removing ammonia from raw coal gas in the coal-to-hydrogen process according to claim 1, wherein: A rubber ring (33) is fixedly connected to the rear end surface of the sliding pipe (3), and the rubber ring (33) is in close fit with the inner surface of the circular pipe (2).
5. The device for removing ammonia from raw coal gas in the coal-to-hydrogen process according to claim 1, wherein: Multiple resistance wires (22) are connected to both the top rear end and the bottom rear end of the circular pipe (2), and the sliding pipe (3) has the same structure corresponding to it.
6. The device for removing ammonia from raw coal gas in the coal-to-hydrogen process according to claim 1, wherein: Multiple fixing frames (26) are fixedly connected to the rear end of the circular pipe (2), and fixing holes are formed on the surfaces of the fixing frames (26).