Sulfuric acid tail gas chimney dredging device

Abstract

The utility model discloses a sulfuric acid tail gas chimney dredging device. An outlet end at the top of a secondary absorption tower is connected with an inlet end at the bottom of a tail absorption tower; the outlet end of the bottom of the tail absorption tower is connected with the inlet end of the lye tank, the outlet end of the lye tank is connected with the inlet end of the spraying pump, and the outlet end of the spraying pump is connected with the spraying device arranged at the upper part in the tail absorption tower through a spraying pipe; the outlet end of the top of the tail absorption tower is connected with a chimney through a tail gas pipe, the bottom of the chimney is provided with a conical funnel, the conical funnel is connected with a blow-off pipe, and the bottom of the blow-off pipe is connected with a water seal tank; wherein at least one cleaning nozzle is arranged at the upper end of the tail gas pipe, and the cleaning nozzle is connected with a pipeline pump. The pipeline cleaning device has the advantages that the interior of a pipeline is cleaned and dredged through the combination of high-pressure water mist impact of the cleaning spray head and the pipeline pump, high-flow-speed wind power of gas and water flow force caused by the height difference of the tail gas pipe, and solid-liquid mixtures are discharged through the blow-off pipe after being formed.

Description

Technical Field

[0001] The utility model relates to the field of sulfuric acid tail gas treatment, in particular to a sulfuric acid tail gas chimney dredging device. Background Art

[0002] In the sulfuric acid production process, after the process gas is purified, sulfuric acid is produced after two conversions and two absorptions in the conversion section. The sulfur dioxide content in the remaining process gas is above 600ppm and cannot be used. It needs to be desulfurized to reduce the sulfur dioxide content to below 200ppm before it can meet environmental standards for discharge. The current conventional practice is to add a set of tail gas absorption and purification equipment at the outlet of the second absorption tower to absorb the sulfur dioxide in the tail gas with alkaline solution, so as to achieve the purpose of purifying the tail gas and safely meeting the discharge standards.

[0003] Among them, the shortcomings of the existing technology are: the sulfuric acid tail suction system uses sodium hydroxide solution to absorb incompletely reacted sulfur dioxide gas to generate sulfite, which easily rises to the tail pipe and conical funnel with the airflow and slowly precipitates, and continuously falls and settles under the action of gravity, and slowly dries and hardens under the action of wind, often blocking the pipeline, increasing the system resistance, affecting normal production, requiring shutdown for cleaning, and affecting the operating rate. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a sulfuric acid tail gas chimney dredging device, so that the tail gas pipeline and the chimney can be cleaned and dredged, thereby improving production efficiency and reducing production costs.

[0005] In order to achieve the above objectives, the technical solution adopted by the utility model is:

[0006] A sulfuric acid tail gas chimney dredging device comprises a secondary absorption tower, a tail absorption tower, a pipeline pump, a spray pump, a spray device, a cleaning nozzle, a chimney, an alkali solution tank, and a water seal box;

[0007] The outlet end at the top of the second absorption tower is connected to the inlet end at the bottom of the tail absorption tower;

[0008] The outlet end of the bottom of the tail absorption tower is connected to the inlet end of the alkali solution tank, the outlet end of the alkali solution tank is connected to the inlet end of the spray pump, and the outlet end of the spray pump is connected to the spray device arranged at the upper part of the tail absorption tower through a spray pipe;

[0009] The outlet end at the top of the tail absorption tower is connected to a chimney through a tail gas pipe, the bottom of the chimney is arranged as a conical funnel, the conical funnel is connected to a sewage pipe, and the bottom of the sewage pipe is connected to a water seal box;

[0010] Wherein, at least one cleaning nozzle is arranged at the upper end of the tail gas pipe, and the cleaning nozzle is connected to a pipeline pump.

[0011] As a preferred solution of the utility model, a pressure detection transmitter is provided at the connection between the second absorption tower and the tail absorption tower.

[0012] As a preferred solution of the utility model, it also includes a DCS system, and the DCS system is respectively connected to the converted signals of the pressure detection transmitter, the pipeline pump, and the spray pump.

[0013] As a preferred solution of the utility model, the tail gas pipe and the chimney form an angle of 70° to 75°.

[0014] As a preferred solution of the utility model, a spray head is arranged at every 200 mm in the spray device, the aperture of the spray head is 2.4 mm, and the spray angle is 110°.

[0015] As a preferred solution of the utility model, the aperture of the cleaning nozzle is 1.8 mm, the spray angle is 25°, and the spray angle forms an angle of 55° to 65° with the tail pipe.

[0016] As a preferred solution of the present utility model, the cleaning nozzle and the shower head are both made of stainless steel.

[0017] As a preferred solution of the utility model, a stop valve is provided on the inlet and outlet of the pipeline pump, the spray pump and the sewage pipe.

[0018] The beneficial effects of the utility model are as follows: by combining the impact of high-pressure water mist from the cleaning nozzle, the wind force of high-speed gas flow and the water flow force caused by the height difference of the tail gas pipe, the pipeline is cleaned and unblocked, and the solid-liquid mixture is discharged through the sewage pipe after being formed, so as to avoid the situation that the system resistance increases and the production process indicators deteriorate due to the blockage of the pipeline and the funnel and the untimely treatment, so as to achieve the purpose of efficient and safe production. It has a simple structure, uses the original main production equipment for transformation, is easy to manufacture and install, has strong practicality, and ensures the reliable and stable operation of the process tail gas absorption and purification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a sulfuric acid tail gas chimney dredging device;

[0020] Figure 2 for Figure 1 A partial enlarged view of middle A.

[0021] The markings in the figure are as follows: 1-second absorption tower; 2-tail absorption tower; 3-spray pump; 4-alkali solution tank; 5-water seal box; 6-drain pipe; 7-chimney; 8-tail gas pipe; 9-spray pipe; 10-spray device; 11-pipeline pump; 12-cleaning nozzle; 13-pressure detection transmitter. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer and more specific, the content of the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings, rather than all the contents.

[0023] like Figure 1 to Figure 2 As shown, the utility model provides a sulfuric acid tail gas chimney dredging device, including a second absorption tower 1, a tail absorption tower 2, a pipeline pump 11, a spray pump 3, a spray device 10, a cleaning nozzle 12, a chimney 7, an alkali solution tank 4, and a water seal box 5;

[0024] The outlet end at the top of the second absorption tower 1 is connected to the inlet end at the bottom of the tail absorption tower 2;

[0025] The outlet end of the bottom of the tail absorption tower 2 is connected to the inlet end of the alkali solution tank 4, the outlet end of the alkali solution tank 4 is connected to the inlet end of the spray pump 3, and the outlet end of the spray pump 3 is connected to the spray device 10 arranged at the upper part of the tail absorption tower 2 through the spray pipe 9; wherein, the alkali solution tank 4 uses a mixture of sodium hydroxide and water with a concentration of about 5%, and the alkali solution is formed into a mist through the filter layer through the spray device 10 to absorb and purify the tail gas, that is, it is transported to the spray head through the spray pump 3 for purification; then, the bottom of the tail absorption tower 2 is connected to the upper part of the alkali solution tank 4 through an overflow pipe at 500mm, and the purified clear liquid is recycled to improve the purification effect;

[0026] The outlet end at the top of the tail absorption tower 2 is connected to a chimney 7 through a tail gas pipe 8, and the purified tail gas enters the chimney through the tail gas pipe 8 and is discharged into the atmosphere; the bottom of the chimney 7 is set as a conical funnel, and the conical funnel is connected to a sewage pipe 6, and the bottom of the sewage pipe 6 is connected to a water seal box 5; wherein, the liquid inside the water seal box 5 is about 100mm higher than the bottom of the sewage pipe 6, that is, the bottom of the sewage pipe 6 is dynamically sealed with liquid water through the water seal box 5, thereby achieving the purpose of automatic dredging control of the tail gas chimney;

[0027] Among them, at least one cleaning nozzle 12 is arranged at the upper end of the tail gas pipe 8, and the cleaning nozzle 12 is connected to the pipeline pump 11; wherein, the cleaning water adopts the recycled water of the cooling system of the sulfuric acid production system, and is combined with the high-pressure water mist impact of the cleaning nozzle 12 and the pipeline pump 11, the high-speed wind force of the gas and the water flow force caused by the height difference of the tail gas pipe 8 to clean and dredge the crystallized salt in the pipeline, and after forming a solid-liquid mixture, it is discharged through the sewage pipe 6, so as to avoid the situation that the system resistance increases and the production process indicators deteriorate due to the untimely treatment after the pipeline and the funnel are blocked, so as to achieve the purpose of efficient and safe production.

[0028] Furthermore, a pressure detection transmitter 13 is provided at the connection between the second absorption tower 1 and the tail absorption tower 2 for detecting the pressure of the process gas in real time and sending the detected signal to the DCS system after conversion processing.

[0029] It should be noted that DCS is the abbreviation of Distributed Control System. The DCS system is a new generation of instrument control system in the existing technology that is based on microprocessors and adopts the design principles of decentralized control functions, centralized display operations, and taking into account both division and autonomy and comprehensive coordination.

[0030] Furthermore, it also includes a DCS system, which is respectively connected to the signals of the converted pressure detection transmitter 13, the pipeline pump 11, and the spray pump 3. According to the real-time data provided by the pressure detection transmitter 13, the DCS system can automatically adjust the operating status of the pipeline pump 11 and the spray pump 3 to realize automatic cleaning and dredging of the pipeline. Specifically, after the conversion, the electrical signals such as the operation control and indication of the pipeline pump 11 and the spray pump 3 are connected to the DCS system together with the pressure signal collected by the pressure detection transmitter 13. When the pressure value detected by the pressure detection transmitter 13 is higher than 20% of the normal pressure of 0.5KPa (that is, 0.6KPa, this pressure can effectively avoid malfunction caused by data deviation caused by system fluctuations) or the interval time reaches 8h, under the action of the DCS system, the pipeline pump 11 is automatically started to flush and dredge the pipeline; when the pressure value detected by the pressure detection transmitter 13 returns to normal or the flushing exceeds 2min, it can be stopped and then the next cycle is carried out, thereby improving the operation efficiency and reliability of the pipeline system and reducing manual intervention and maintenance costs.

[0031] Furthermore, the tail gas pipe 8 and the chimney 7 form an angle of 70° to 75°, and the end of the chimney 7 is slightly lower, which is convenient for air flow and water flow to flush and clean the crystallized salt.

[0032] Furthermore, a spray head is arranged at an interval of 200 mm in the spray device 10 to ensure sufficient contact between the exhaust gas and the spray liquid; the aperture of each spray head is 2.4 mm, which can not only ensure sufficient spraying area, but also ensure uniform distribution of the spray liquid; the spray angle is 110°, so that the spray liquid forms a wide coverage area; and the spray heads are arranged in a cross-radial shape to form a mist filtering and purification layer, thereby forming an effective absorption and purification area, thereby improving the absorption and purification effect of the exhaust gas.

[0033] Furthermore, the aperture of the cleaning nozzle 12 is 1.8 mm, which ensures the concentration and impact force of the water flow; the spray angle is 25°, and the injection angle is 55° to 65° with the tail pipe 8, so that the cleaning nozzle 12 can spray to the key parts to achieve efficient unblocking; preferably, the two sets of cleaning nozzles 12 form a cross-flushing structure, so that the cleaning nozzles 12 can clean in all directions and at multiple angles to achieve effective unblocking.

[0034] Furthermore, the cleaning nozzle 12 and the spray head are both made of stainless steel, which can extend their service life and reduce the overall maintenance cost of the exhaust gas treatment system.

[0035] Furthermore, a stop valve is provided on the inlet and outlet of the pipeline pump 11, the spray pump 3 and the sewage pipe 6, which is opened during normal production and closed during maintenance.

[0036] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A sulfuric acid tail gas chimney dredging device, comprising a second absorption tower, a tail absorption tower, a pipeline pump, a spray pump, a spray device, a cleaning nozzle, a chimney, an alkali solution tank, and a water seal box, characterized in that: The outlet end at the top of the second absorption tower is connected to the inlet end at the bottom of the tail absorption tower; The outlet end of the bottom of the tail absorption tower is connected to the inlet end of the alkali solution tank, the outlet end of the alkali solution tank is connected to the inlet end of the spray pump, and the outlet end of the spray pump is connected to the spray device arranged at the upper part of the tail absorption tower through a spray pipe; The outlet end at the top of the tail absorption tower is connected to a chimney through a tail gas pipe, the bottom of the chimney is arranged as a conical funnel, the conical funnel is connected to a sewage pipe, and the bottom of the sewage pipe is connected to a water seal box; Wherein, at least one cleaning nozzle is arranged at the upper end of the tail gas pipe, and the cleaning nozzle is connected to a pipeline pump.

2. The sulfuric acid tail gas chimney dredging device according to claim 1 is characterized in that: A pressure detection transmitter is provided at the connection between the second absorption tower and the tail absorption tower.

3. The sulfuric acid tail gas chimney dredging device according to claim 1 is characterized in that: It also includes a DCS system, which is respectively connected to the converted signals of the pressure detection transmitter, pipeline pump and spray pump.

4. The sulfuric acid tail gas chimney dredging device according to claim 1 is characterized in that: The tail gas pipe and the chimney form an angle of 70° to 75°.

5. The sulfuric acid tail gas chimney dredging device according to claim 1 is characterized in that: A spray head is arranged at every 200 mm in the spray device, the aperture of the spray head is 2.4 mm, and the spray angle is 110°.

6. The sulfuric acid tail gas chimney dredging device according to claim 1 is characterized in that: The aperture of the cleaning nozzle is 1.8 mm, the spray angle is 25°, and the spray angle forms an angle of 55° to 65° with the tail gas pipe.

7. The sulfuric acid tail gas chimney dredging device according to claim 1 is characterized in that: The cleaning nozzle and the shower head are both made of stainless steel.

8. The sulfuric acid tail gas chimney dredging device according to claim 1 is characterized in that: A stop valve is arranged on the inlet and outlet of the pipeline pump, the spray pump and the sewage discharge pipe.

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