Alkali preparation device for low-temperature methanol washing device

Abstract

The utility model provides a kind of low temperature methanol washing device is used to match alkali device, it is related to low temperature methanol washing device matching alkali equipment field, including stainless steel alkali mixing tank and be connected with the communication of the bottom of the one side of stainless steel alkali mixing tank and be sent pump, be equipped with feeding opening on stainless steel alkali mixing tank, further include weighing equipment, plugging component, mounting bracket, desalted water liquid adding component, solid caustic soda feeding component, steam generator, turbulence component and non-contact liquid level sensor;The device can automatically complete accurate configuration of caustic soda solution and improve the dissolution effect of solid caustic soda in desalted water by steam generator and turbulence component after being configured, and then the dissolution speed of solid caustic soda in desalted water is accelerated and more sufficient, in turn by conveying pump, injection in the connecting pipeline between tail gas water scrubbing tower and booster pump can be realized, finally lye reaches methanol / water separation tower and neutralizes the acidity of its wastewater to extend the service life of entire low temperature methanol washing system.

Description

Technical Field

[0001] This utility model relates to the field of alkali preparation equipment for low-temperature methanol washing devices, and more specifically, to an alkali preparation device for low-temperature methanol washing devices. Background Technology

[0002] The function of the low-temperature methanol washing system is to use low-temperature methanol as a scrubbing agent to remove hydrogen sulfide and carbon dioxide from the feed gas. After washing, the methanol undergoes further desorption and regeneration within the low-temperature methanol washing system to remove adsorbed hydrogen sulfide and carbon dioxide, resulting in clean methanol that can be recycled. The low-temperature methanol washing regeneration unit consists of a methanol / water separator, a thermal regeneration tower, and a tail gas washing tower. A complete process flow diagram of the low-temperature methanol washing system is attached to the instruction manual. Figure 2 As shown, its process flow belongs to existing technology.

[0003] The function of a methanol / water separator is to adjust the water content in methanol and maintain water balance. A methanol / water separator mainly has four feeds: lean methanol, alcohol condensate in the pre-separator, reflux methanol, and washing water.

[0004] Currently, after long-term operation, acidic substances in the raw gas enter the methanol / water separator along with the alcohol-containing condensate from the separator in front of the tower and accumulate there, causing the wastewater at the bottom to become acidic. The acidic dehydration system will aggravate the corrosion of equipment and wastewater pipelines. The entire system is interconnected, and the accumulation of acidic substances will affect the long-term operation of the entire system and shorten the service life of the equipment.

[0005] The existing solutions to the above problems are as follows:

[0006] First, a caustic soda solution is introduced into the connecting pipeline between the tail gas scrubbing tower and the booster pump (since the pressure inside the tail gas scrubbing tower is lower than that inside the methanol / water separation tower, an external booster pump is required to achieve reflux). Then, under the action of the booster pump, caustic soda solution is introduced into the methanol / water separation tower to reduce the acidity of the wastewater at the bottom of the methanol / water separation tower. However, the preparation of the caustic soda solution currently requires manual operation, resulting in inaccurate concentration and poor dissolution effect, specifically slow dissolution speed and incomplete dissolution. Utility Model Content

[0007] The purpose of this utility model is to solve the problems mentioned in the background art, and then to propose an alkali preparation device for a low-temperature methanol washing device.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A low-temperature methanol washing unit includes a stainless steel alkali mixing tank and a transfer pump located on one side of the stainless steel alkali mixing tank and connected to its bottom. The stainless steel alkali mixing tank has a feeding port. The unit also includes a weighing device, a sealing assembly, a mounting frame, a demineralized water feeding assembly, a solid caustic soda feeding assembly, a steam generator, a turbulence-inducing assembly, and a non-contact liquid level sensor.

[0010] The weighing equipment is equipped with a stainless steel caustic soda mixing tank, and the weighing equipment is electrically connected to the solid caustic soda feeding assembly and the demineralized water adding assembly.

[0011] The sealing component is installed on the stainless steel alkali mixing tank and is matched with the feed port;

[0012] The mounting racks and stainless steel alkali mixing tanks are spaced apart.

[0013] Both the demineralized water addition assembly and the solid caustic soda feeding assembly are mounted on the mounting frame and connected to the feeding port;

[0014] The steam generator is mounted on a mounting bracket and connected to a turbulence-inducing component mounted on a stainless steel alkali mixing tank.

[0015] The non-contact liquid level sensor is installed inside the stainless steel alkali mixing tank and is electrically connected to the weighing equipment and the suction pump.

[0016] Furthermore, the sealing assembly includes a telescopic component and a sealing plate. The stainless steel alkali mixing tank is equipped with a telescopic component, which is connected to a sealing plate located inside the stainless steel alkali mixing tank. The sealing plate cooperates with the feed port.

[0017] After the above-mentioned solution is prepared, the weighing equipment will immediately send a signal to the controller. The controller will then control the sealing component to seal the feed port to prevent other impurities from entering the stainless steel alkali mixing tank from the feed port.

[0018] Furthermore, the demineralized water addition assembly includes a suction pump, a demineralized water feeding pipe, and a hose. The suction pump is mounted on the mounting frame. The output end of the suction pump is connected to the demineralized water feeding pipe, and the end of the demineralized water feeding pipe is located above the feeding port. The input end of the suction pump is connected to the demineralized water tank through the hose, and the suction pump is electrically connected to the weighing equipment.

[0019] The above scheme achieves quantitative addition of solvent through the electrical connection between the demineralized water addition component and the weighing equipment.

[0020] Furthermore, the solid caustic soda feeding assembly includes a solid caustic soda storage tank, a feeding pipe, and a star-shaped unloader. The solid caustic soda storage tank is mounted on the mounting frame. A solenoid valve is installed at the outlet of the solid caustic soda storage tank and is connected to the feeding pipe. A star-shaped unloader is installed on the feeding pipe, and the end of the feeding pipe is located above the feeding port. Both the star-shaped unloader and the solenoid valve are electrically connected to the weighing equipment.

[0021] The above scheme achieves quantitative addition of solute through the electrical coordination between the solid caustic soda feeding component and the weighing equipment.

[0022] Furthermore, the turbulence assembly includes a turbulence pipe and branch pipes. The stainless steel alkali mixing tank is provided with a turbulence pipe that connects to the steam generator, and the turbulence pipe is connected to several branch pipes located inside the stainless steel alkali mixing tank.

[0023] Furthermore, the branch pipe is equipped with a corrosion-resistant nozzle.

[0024] The above scheme uses a steam generator and a turbulence-inducing component to spray steam into the alkali solution at multiple points, thereby causing the caustic soda solution to surge. At the same time, the steam can increase the temperature of the alkali solution, thereby improving the dissolution effect of solid caustic soda in demineralized water.

[0025] Furthermore, the non-contact liquid level sensor is an ultrasonic liquid level sensor and is installed inside the top of the stainless steel alkali mixing tank.

[0026] The above solution uses an ultrasonic level sensor to monitor the liquid level in real time and promptly feeds back a signal to replenish the alkali solution when it is insufficient.

[0027] Furthermore, an electric heating cable is installed on the outer wall of the stainless steel alkali mixing tank.

[0028] The above solution uses electric heating tape to assist in heating the stainless steel caustic soda tank when the outside temperature is low in winter, thereby ensuring the stable dissolution effect of the solid caustic soda in the demineralized water.

[0029] Furthermore, the stainless steel alkali mixing tank is equipped with an automatic pressure relief valve.

[0030] The above solution uses an automatic pressure relief valve to stabilize the pressure in the stainless steel caustic soda mixing tank when preparing caustic soda solution, thus avoiding excessive pressure that could cause safety hazards.

[0031] Compared with the prior art, the beneficial effects of this utility model are:

[0032] Compared to existing technologies, this device can automatically and accurately prepare the caustic soda solution. After preparation, it uses a steam generator and a turbulence-inducing component to improve the dissolution effect of solid caustic soda in demineralized water. As a result, the dissolution rate of solid caustic soda in demineralized water is accelerated and the dissolution is more complete. Then, it can be injected into the connecting pipeline between the tail gas washing tower and the pressurization pump through a transfer pump. Finally, the alkali solution reaches the methanol / water separation tower to neutralize the acidity of the wastewater, thereby extending the service life of the entire low-temperature methanol washing system. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0034] Figure 2 Here is the process flow diagram of the existing low-temperature methanol washing system;

[0035] Figure label:

[0036] 1. Weighing equipment; 2. Stainless steel caustic soda mixing tank; 3. Feed port; 4. Telescopic component; 5. Sealing plate; 6. Mounting frame; 7. Suction pump; 8. Demineralized water feeding pipe; 9. Solid caustic soda storage tank; 10. Discharge pipe; 11. Rotary rotary valve; 12. Steam generator; 13. Baffle pipe; 14. Branch pipe; 15. Transfer pump; 16. Non-contact liquid level sensor. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments:

[0038] like Figure 1 As shown, an alkali preparation device for a low-temperature methanol washing unit includes a stainless steel alkali preparation tank 2 and a transfer pump 15 disposed on one side of the stainless steel alkali preparation tank 2 and connected to its bottom. The stainless steel alkali preparation tank 2 has a feeding port 3. It also includes a weighing device 1, a sealing assembly, a mounting frame 6, a solid caustic soda feeding assembly, a demineralized water feeding assembly, a steam generator 12, a turbulence evaporation assembly, and a non-contact liquid level sensor.

[0039] A stainless steel caustic soda mixing tank 2 is placed on the weighing device 1, and the weighing device 1 is electrically connected to the solid caustic soda feeding assembly and the demineralized water adding assembly respectively.

[0040] The sealing component is installed on the stainless steel alkali mixing tank 2 and is matched with the feed port 3;

[0041] The mounting frame 6 and the stainless steel alkali mixing tank 2 are distributed at intervals;

[0042] Both the demineralized water addition assembly and the solid caustic soda feeding assembly are mounted on the mounting frame 6 and connected to the feeding port 3;

[0043] The steam generator 12 is mounted on the mounting bracket 6 and connected to the turbulence assembly mounted on the stainless steel alkali mixing tank 2.

[0044] The non-contact liquid level sensor is installed inside the stainless steel alkali mixing tank 2 and is electrically connected to the weighing device 1 and the suction pump 7 respectively (specifically, the non-contact liquid level sensor is an ultrasonic liquid level sensor 16 and is installed at the top inside the stainless steel alkali mixing tank 2).

[0045] Further refinements of the embodiments of this utility model, such as... Figure 1 As shown, the sealing assembly includes a telescopic component 4 and a sealing plate 5. The stainless steel alkali mixing tank 2 is provided with a telescopic component 4, which is connected to the sealing plate 5 located inside the stainless steel alkali mixing tank 2. The sealing plate 5 cooperates with the feeding port 3 and is electrically connected to the weighing device 1.

[0046] Further refinements of the embodiments of this utility model, such as... Figure 1 As shown, the demineralized water addition assembly includes a suction pump 7, a demineralized water feeding pipe 8, and a hose. The suction pump 7 is mounted on the mounting frame 6. The output end of the suction pump 7 is connected to the demineralized water feeding pipe 8, and the end of the demineralized water feeding pipe 8 is located above the feeding port 3. The input end of the suction pump 7 is connected to the demineralized water tank through the hose, and the suction pump 7 is electrically connected to the weighing device 1. The demineralized water tank is not shown in the figure.

[0047] Further refinements of the embodiments of this utility model, such as... Figure 1 As shown, the solid caustic soda feeding assembly includes a solid caustic soda storage tank 9, a discharge pipe 10, and a star-shaped unloader 11. The solid caustic soda storage tank 9 is mounted on the mounting frame 6. A solenoid valve is installed at the discharge port of the solid caustic soda storage tank 9 and is connected to the discharge pipe 10 (the solenoid valve is shown in the figure but is not labeled). The star-shaped unloader 11 is installed on the discharge pipe 10 and the end of the discharge pipe 10 is above the feeding port 3. The star-shaped unloader 11 and the solenoid valve are both electrically connected to the weighing equipment 1.

[0048] Further refinements of the embodiments of this utility model, such as... Figure 1 As shown, the turbulence assembly includes a turbulence pipe 13 and branch pipes 14. The stainless steel caustic soda tank 2 is provided with a turbulence pipe 13 that connects to the steam generator 12. The turbulence pipe 13 is connected to several branch pipes 14 located inside the stainless steel caustic soda tank 2. In a further optimization of the scheme, corrosion-resistant nozzles are provided on the branch pipes 14. The corrosion-resistant nozzles can pressurize the steam and thus improve the surging effect of the caustic soda solution.

[0049] Further refinements of the embodiments of this utility model, such as... Figure 1 As shown, the stainless steel caustic soda tank 2 is equipped with an automatic pressure relief valve to stabilize the pressure in the stainless steel caustic soda tank 2 when preparing caustic soda solution, and to avoid excessive pressure causing safety hazards. The automatic pressure relief valve is shown in the figure but is not labeled.

[0050] It should be noted that the weighing device 1, telescopic component 4, suction pump 7, star-shaped unloader 11, steam generator 12, transfer pump 15, and non-contact liquid level sensor are all electrically connected to the controller, which is not shown in the figure.

[0051] The working process of this utility model is as follows:

[0052] Initially, the weighing device 1 is set to 0 by the controller. Then, the controller first controls the solenoid valve to open, thus starting the feeding of solid caustic soda. During this process, the star-shaped unloader 11 can achieve uniform feeding of solid caustic soda into the stainless steel caustic soda mixing tank 2. As the solid feeding proceeds, the weight of the weighing device 1 gradually increases. When the weighing value is about to reach the solid material weighing value preset in the controller, the weighing device 1 sends a feedback signal to the controller. Then, the controller controls the star-shaped unloader 11 to stop working, thereby stopping the feeding and closing the solenoid valve at the same time.

[0053] Subsequently, the controller controls the suction pump 7 to operate, thereby drawing demineralized water from the demineralized water tank and injecting it into the stainless steel alkali mixing tank 2. Similarly, as the liquid is injected, the weight of the weighing device 1 continues to increase based on the solid weighing value. When the total weighing value is about to reach the total material weighing value preset in the controller, the weighing device 1 sends a signal back to the controller. Then, the controller controls the suction pump 7 to stop the liquid injection, and the quantitative addition of solute and solvent can be accurately completed. As a result, the concentration of the caustic soda solution after subsequent preparation is within the standard range.

[0054] After the alkali solution is weighed and configured, the controller controls the sealing component to block the feed port 3 to reduce the probability of other impurities entering the stainless steel alkali mixing tank 2 from the feed port 3. Then, the controller controls the steam generator 12 to generate steam. The steam then enters the turbulence pipe 13 and is sprayed into the alkali solution from multiple branch pipes 14, causing the caustic soda solution to surge. At the same time, the steam can appropriately increase the temperature of the alkali solution, thereby improving the dissolution effect of solid caustic soda in demineralized water (the steam turbulence time period is preset to prevent the alkali solution temperature from continuously rising).

[0055] After the solid caustic soda is completely dissolved in the demineralized water, the controller controls the delivery pump 15 to work, thereby drawing caustic soda from the stainless steel caustic soda tank 2 and injecting it into the connecting pipeline between the tail gas water washing tower and the pressurizing pump. Then, under the action of the pressurizing pump, the caustic soda is injected into the methanol / water separation tower to reduce the acidity of the wastewater at the bottom of the tower and thus extend the service life of the low temperature methanol washing system.

[0056] As the alkali solution is introduced, the alkali solution in the stainless steel alkali tank 2 will gradually decrease. At this time, the change in liquid level can be detected in real time by the ultrasonic liquid level sensor. When the liquid level in the stainless steel alkali tank 2 reaches the lower limit position set in the controller, the ultrasonic liquid level sensor 16 will send a signal to the controller. Then the controller will first control the delivery pump 15 to stop, and then control the weighing device 1 to set to 0. Then the above process is repeated to start a new round of alkali preparation process.

[0057] Compared to existing technologies, this device can automatically and accurately prepare the caustic soda solution. After preparation, the steam generator 12 and the turbulence-inducing components improve the dissolution effect of solid caustic soda in the demineralized water, thereby accelerating the dissolution rate and making the dissolution more complete. Then, the caustic soda solution is injected into the connecting pipeline between the tail gas washing tower and the pressurization pump through the transfer pump 15. Finally, the caustic soda solution reaches the methanol / water separation tower to neutralize the acidity of the wastewater, thereby extending the service life of the entire low-temperature methanol washing system.

[0058] In some embodiments, the outer wall of the stainless steel caustic soda tank 2 is provided with an electric heating tape, which is not shown in the figure; in this embodiment, the electric heating tape can be used to assist in heating the stainless steel caustic soda tank 2 when the outside temperature is low in winter, thereby ensuring the stable dissolution effect of the solid caustic soda in the demineralized water.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low-temperature methanol washing device for the device with alkali, including stainless steel alkali mixing tank (2) and set in stainless steel alkali mixing tank (2) one side and with its bottom communication delivery pump (15), stainless steel alkali mixing tank (2) on the opening has a feeding port (3), characterized in that, It also includes a weighing device (1), a sealing assembly, a mounting bracket (6), a demineralized water addition assembly, a solid caustic soda feeding assembly, a steam generator (12), a turbulence evaporation assembly, and a non-contact liquid level sensor (16). A stainless steel caustic soda mixing tank (2) is placed on the weighing equipment (1), and the weighing equipment (1) is electrically connected to the solid caustic soda feeding assembly and the demineralized water adding assembly respectively; The sealing component is installed on the stainless steel alkali mixing tank (2) and is matched with the feeding port (3); The mounting bracket (6) and the stainless steel alkali mixing tank (2) are spaced apart; The demineralized water addition assembly and the solid caustic soda feeding assembly are both mounted on the mounting frame (6) and connected to the feeding port (3); The steam generator (12) is mounted on the mounting bracket (6) and connected to the turbulence assembly mounted on the stainless steel alkali mixing tank (2); The non-contact liquid level sensor (16) is installed in the stainless steel alkali tank (2) and is electrically connected to the weighing equipment (1) and the transfer pump (15).

2. The alkali preparation device for low-temperature methanol washing device according to claim 1, characterized in that, The sealing assembly includes a telescopic component (4) and a sealing plate (5). The stainless steel alkali mixing tank (2) is provided with a telescopic component (4). The telescopic component (4) is connected to the sealing plate (5) inside the stainless steel alkali mixing tank (2). The sealing plate (5) cooperates with the feed port (3).

3. The alkali preparation device for low-temperature methanol washing device according to claim 1, characterized in that, The demineralized water addition assembly includes a suction pump (7), a demineralized water feeding pipe (8), and a hose. The suction pump (7) is installed on the mounting frame (6). The output end of the suction pump (7) is connected to the demineralized water feeding pipe (8), and the end of the demineralized water feeding pipe (8) is above the feeding port (3). The input end of the suction pump (7) is connected to the demineralized water tank through the hose, and the suction pump (7) is electrically connected to the weighing equipment (1).

4. The alkali preparation device for low-temperature methanol washing device according to claim 1, characterized in that, The solid caustic soda feeding assembly includes a solid caustic soda storage tank (9), a feeding pipe (10), and a star-shaped unloader (11). The solid caustic soda storage tank (9) is installed on the mounting frame (6). A solenoid valve is installed on the outlet of the solid caustic soda storage tank (9) and is connected to the feeding pipe (10). A star-shaped unloader (11) is installed on the feeding pipe (10) and the end of the feeding pipe (10) is above the feeding port (3). The star-shaped unloader (11) and the solenoid valve are electrically connected to the weighing equipment (1).

5. The alkali preparation device for low-temperature methanol washing device according to claim 1, characterized in that, The turbulence assembly includes a turbulence pipe (13) and branch pipes (14). The stainless steel alkali tank (2) is provided with a turbulence pipe (13) that connects to the steam generator (12). The turbulence pipe (13) is connected to several branch pipes (14) located inside the stainless steel alkali tank (2).

6. The recausticizing device for a cryogenic methanol washing device according to claim 5, characterized in that, The branch pipe (14) is equipped with a corrosion-resistant nozzle.

7. The alkali preparation device for low-temperature methanol washing device according to claim 1, characterized in that, The non-contact liquid level sensor (16) is an ultrasonic liquid level sensor and is installed inside the top of the stainless steel alkali tank (2).

8. The alkali preparation device for a low-temperature methanol washing unit according to claim 1, characterized in that, An electric heating cable is installed on the outer wall of the stainless steel alkali mixing tank (2).

9. The alkali preparation device for low-temperature methanol washing device according to claim 1, characterized in that, The stainless steel alkali mixing tank (2) is equipped with an automatic pressure relief valve.

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