A tail gas recovery device for a methanol production system tank area

Abstract

The application is suitable for the technical field of formaldehyde production, and provides a tail gas recovery device for a tank area of a formaldehyde production system, which comprises a treatment tower, a liquid storage area is arranged at the bottom of the treatment tower, a first corrugated packing is arranged above the liquid storage area, a first spraying pipe is installed above the first corrugated packing, the liquid storage area is connected with an input end of a first circulating pump through a pipeline, an output end of the first circulating pump is communicated with the first spraying pipe, a flow inducer is installed above the first spraying pipe, an air inlet hole is arranged in the flow inducer, a second corrugated packing is installed above the air inlet hole, a second spraying pipe is installed above the second corrugated packing, the flow inducer is connected with a second circulating pump through a pipeline, an output end of the second circulating pump is communicated with the second spraying pipe, a tank area recovery main pipe is arranged on one side of the treatment tower, an input end of a fan is communicated with the tank area recovery main pipe, and an output end of the fan is communicated with the liquid storage area through a pipeline, so that the condensation effect is improved through double spraying absorption, and the energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of formaldehyde production technology and provides a formaldehyde production system tank area tail gas recovery device. Background Technology

[0002] In the formaldehyde production process, the tank area is a crucial zone for storing raw materials and intermediate products such as formaldehyde. Due to production operations, equipment leaks, and other reasons, the tank area may emit exhaust gases containing harmful substances such as formaldehyde. If these exhaust gases are directly released into the atmosphere, they will not only cause environmental pollution but may also affect the health of surrounding populations.

[0003] Therefore, tail gas recovery from formaldehyde production system tank farms has become an important environmental protection measure. By installing tail gas recovery devices, the tail gas emitted from the tank farm is collected and treated appropriately (such as absorption, adsorption, catalytic oxidation, etc.) to separate harmful substances such as formaldehyde from the tail gas for reuse or harmless treatment.

[0004] In existing technologies, the exhaust gas from the tank area of ​​formaldehyde production systems is difficult to fully condense and absorb, resulting in high energy consumption. Summary of the Invention

[0005] To address the aforementioned deficiencies, the present invention aims to provide a formaldehyde production system tank area tail gas recovery device, which solves the problems mentioned in the background. The device includes a treatment tower, a liquid storage area at the bottom of which is topped with a first corrugated packing material. A first spray pipe is installed above the first corrugated packing material. The liquid storage area is connected to the input end of a first circulating pump via a pipeline. The output end of the first circulating pump is connected to the first spray pipe. A flow guide is installed above the first spray pipe, and an air inlet is provided inside the flow guide. A second corrugated packing material is installed above the air inlet. A second spray pipe is installed above the second corrugated packing material. The flow guide is connected to a second circulating pump via a pipeline. The output end of the second circulating pump is connected to the second spray pipe. A tank area recovery main pipe is located on one side of the treatment tower, connected to the input end of a blower. The output end of the blower is connected to the liquid storage area via a pipeline.

[0006] Furthermore, the diverter includes a ventilation seat, which is fixedly connected to the inner wall of the middle part of the treatment tower. The air inlet is located in the middle of the ventilation seat. A flow channel is provided at the top of the ventilation seat, and a drain hole is provided at the bottom of the flow channel. The drain hole is connected to the input end of the second circulation pump.

[0007] Furthermore, a flow guide ring is installed on the top of the ventilation seat. The flow guide ring includes a large diameter, a small diameter, and an arc-shaped surface. The large diameter matches the outer diameter of the ventilation seat, and the small diameter matches the inner diameter of the flow channel.

[0008] Furthermore, the side wall of the ventilation seat is provided with several ventilation holes, and a gap is provided between the drainage ring and the ventilation seat to allow gas to pass through.

[0009] Furthermore, the arc-shaped surface bends inward.

[0010] Furthermore, a plurality of mounting plates are installed at the bottom of the drainage ring, with the end of the mounting plate away from the ventilation seat installed on the top of the ventilation seat.

[0011] Furthermore, the main recovery pipe of the tank area is connected to the input end of the condensate recovery device, the output end of the condensate recovery device is connected to the input end of the blower, the condensate of the condensate recovery device is connected to the condensate tank through a pipeline, the condensate tank is connected to the outlet pipe, and the bottom of the storage area is connected to the outlet pipe through a pipeline.

[0012] Furthermore, a flame arrester is installed at the top of the treatment tower, and an exhaust gas processor is installed at the output end of the flame arrester.

[0013] Furthermore, a level gauge is installed on the side wall of the liquid storage area.

[0014] Furthermore, the liquid storage area is connected to a pure water pipe.

[0015] Beneficial effects This invention achieves dual spray absorption of tank area exhaust gas through a first spray pipe and a second spray pipe, improving condensation efficiency and reducing energy consumption; the first and second corrugated packing materials purify the tank area exhaust gas; the condensate in the storage area mixes with the condensate in the tank area recovery main pipe and is finally recycled; the air inlet of the diverter increases the flow rate of the tank area exhaust gas, accelerating condensation and promoting absorption; the ventilation holes of the diverter allow some of the tank area exhaust gas to enter through the ventilation holes, where it encounters the diverting ring and condenses, accelerating condensation and condensate recovery; the condensate generated by the tank area exhaust gas and the second spray pipe flows into the flow channel from the arc surface and is discharged from the drain hole. Attached Figure Description

[0016] Figure 1 This is a flowchart of the present invention; Figure 2 This is an isometric view of the drain device of the present invention; Figure 3 This is an isometric drawing of the ventilation seat of the present invention; Figure 4 This is an isometric view of the drainage ring of the present invention; In the diagram, 1-treatment tower, 101-first corrugated packing, 102-second corrugated packing, 2-flame arrester, 3-tail gas processor, 4-liquid storage area, 5-first outlet pipe, 6-first circulating pump, 7-first inlet pipe, 8-first spray pipe, 9-drainage device, 91-ventilation seat, 92-ventilation hole, 93-flow channel, 94-air inlet hole, 95-drain hole, 96-drainage ring, 97-large diameter, 98-arc surface, 99-small diameter, 910-mounting plate, 10-second outlet pipe, 11-second circulating pump, 12-second inlet pipe, 13-second spray pipe, 14-tank area recovery main pipe, 15-condensate recovery unit, 16-fan, 17-condensate tank, 18-water outlet pipe, 19-sampling pipe, 20-recovery pipe, 21-level gauge, 22-pure water pipe, 23-air duct. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] See Figure 1-4 The purpose of this invention is to provide a formaldehyde production system tank area tail gas recovery device, including a treatment tower 1, the top of the treatment tower 1 is connected to a tail gas processor 3 through a pipeline, the input end of the tail gas processor 3 is connected to a flame arrester 2 through a pipeline, and the flame arrester 2 is used at the inlet of the tail gas processor 3 to play a safety role.

[0019] A liquid storage zone 4 is located at the bottom of the treatment tower 1, and a first corrugated packing 101 is installed on the top of the liquid storage zone 4. A level gauge 21 is installed on the side wall of the liquid storage zone 4 to monitor the liquid level. A first outlet pipe 5 is connected to the bottom of the liquid storage zone 4, and the first outlet pipe 5 is connected to the input end of a first circulating pump 6. The output end of the first circulating pump 6 is connected to a first inlet pipe 7, and the first inlet pipe 7 is connected to a first spray pipe 8. The first spray pipe 8 is installed below the diverter 9 and is located in the middle of the treatment tower 1. Spray heads are installed on the first spray pipe 8 to condense the exhaust gas. The first corrugated packing 101 purifies the exhaust gas.

[0020] A flow guide 9 is installed above the first spray pipe 8, and a second corrugated packing 102 is installed above the flow guide 9. The flow guide 9 includes a ventilation seat 91, the side wall of which is threaded to the inner wall of the treatment tower 1. The top of the ventilation seat 91 is provided with evenly distributed ventilation holes 92, through which exhaust gas is introduced. The interior of the ventilation seat 91 is provided with an annular flow channel 93, and the bottom of the flow channel 93 is provided with a drain hole 95 for discharging condensate. The center of the ventilation seat 91 is provided with an air inlet 94, through which exhaust gas is introduced. As the exhaust gas passes through the air inlet 94 from the bottom of the treatment tower 1, the area through which it enters decreases, and the flow velocity increases. This allows the exhaust gas to fully contact the second corrugated packing 102, enhancing the condensation effect while adsorbing the exhaust gas. A guide ring 96 is installed on the top of the ventilation seat 91. The guide ring 96 has an annular structure with a large diameter 97 and a small diameter 99 at its two ends. The large diameter 97 is the same as the outer diameter of the ventilation seat 91, while the small diameter 99 is smaller than the outer diameter of the flow channel 93. The area between the large diameter 97 and the small diameter 99 is an arc-shaped surface 98 that curves inward. The condensate above the guide ring 96 flows into the flow channel 93 from the upper surface of the guide ring 96. The exhaust gas entering through the ventilation hole 92 condenses and flows into the flow channel 93 from the lower surface of the guide ring 96, enhancing the condensation effect. Furthermore, the continuous flow of condensate on the upper surface of the guide ring 96 enhances its heat dissipation effect. Therefore, during the contact between the exhaust gas and the lower surface of the guide ring 96, the condensation effect of the exhaust gas in the ventilation hole 92 is enhanced. A mounting plate 910 is welded to the bottom of the small diameter 99. The end of the mounting plate 910 away from the flow ring 96 is bolted to the top of the ventilation seat 91, and the side wall of the mounting plate 910 is welded to the outer wall of the flow channel 93. A distance is left between the flow ring 96 and the top of the ventilation seat 91.

[0021] The drain hole 95 of the diverter 9 is connected to the second outlet pipe 10, the second outlet pipe 10 is connected to the input end of the second circulation pump 11, the output end of the second circulation pump 11 is connected to the second inlet pipe 12, the second inlet pipe 12 is connected to the second spray pipe 13, the second spray pipe 13 is installed on the upper part of the treatment tower 1; the second spray pipe 13 is equipped with several spray heads to realize secondary spraying.

[0022] The upper part of the liquid storage area 4 is connected to a pure water pipe 22, and pure water is introduced into the pure water pipe 22 to achieve condensation.

[0023] A tank area recovery main pipe 14 is installed on one side of the treatment tower 1. The tank area recovery main pipe 14 is connected to a condensate recovery unit 15. The condensate recovery unit 15 recovers the condensate generated by part of the gas in the tank area recovery main pipe 14. The condensate of the condensate recovery unit 15 is connected to a condensate tank 17 through a pipeline. A water outlet pipe 18 is installed at the bottom of the condensate tank 17. A sampling port is installed at the bottom of the liquid storage area 4. The sampling port is connected to a sampling pipe 19. The sampling pipe 19 is connected to the water outlet pipe 18 for subsequent recycling.

[0024] The output end of the condensate recovery unit 15 is connected to the input end of the fan 16, and the output end of the fan 16 is connected to the duct 23. The duct 23 is connected to the upper part of the storage area 4. The fan 16 draws air from the exhaust gas of the tank area recovery main pipe 14. The first circulation pump 6 pumps out pure water from the storage area 4 and sprays it out from the first spray pipe 8 to condense the exhaust gas from the tank area sent into the treatment tower 1. The first corrugated packing 101 at the bottom of the treatment tower 1 purifies the exhaust gas from the tank area. Then, the exhaust gas from the tank area passes through the first corrugated packing 101 at the bottom of the treatment tower 1 and then reaches the upper part of the treatment tower 1 through the gap between the diverters 9. The second circulation pump 11 pumps out some of the condensate in the diverters 9 again and sprays it through the second spray pipe 13 to enhance the exhaust gas treatment effect. The second corrugated packing 102 at the top of the treatment tower 1 purifies the exhaust gas from the tank area.

[0025] In summary, during actual use, tank area exhaust gas is introduced into the tank area recovery main pipe 14. The exhaust gas passes through the condensate recovery unit 15, and the condensate in the tank area recovery main pipe 14 flows through the condensate recovery unit 15 to the condensate tank 17. Then, the exhaust gas is induced by the blower 16 to reach the upper part of the storage area 4, where it is purified by the first corrugated packing 101 below the treatment tower 1. Simultaneously, pure water is introduced into the pure water pipe 22, and the first circulating pump 6 pumps the pure water from the storage area 4 into the first spray pipe 8 to cool and condense the tank area exhaust gas. Then, the exhaust gas... The exhaust gas from the tank area passes through the air inlet 94 of the diverter 9 and reaches the second corrugated packing 102 above the treatment tower 1 for purification. At the same time, the second circulation pump 11 pumps the liquid in the diverter 9 into the second spray pipe 13 to spray and absorb the exhaust gas from the tank area again. Then, the exhaust gas passes through the flame arrester 2 above the treatment tower 1 and reaches the exhaust gas processor 3 for final exhaust gas treatment. The condensate in the condensate tank 17 is connected to the water outlet pipe 18, and the condensate in the liquid storage area 4 is connected to the sampling pipe 19. The condensate in the water outlet pipe 18 and the sampling pipe 19 are recycled together.

[0026] Thus, the device can achieve dual spray absorption of tank area exhaust gas through the first spray pipe 8 and the second spray pipe 13; the first corrugated packing 101 and the second corrugated packing 102 purify the tank area exhaust gas; the condensate in the storage area 4 mixes with the condensate in the tank area recovery main pipe 14 and is finally recycled; the air inlet 94 of the diverter 9 increases the flow rate of the tank area exhaust gas, accelerates condensation and promotes exhaust gas absorption; the ventilation hole 92 of the diverter 9 allows some of the tank area exhaust gas to enter through the ventilation hole 92, encounter the diverter ring 96 and condense, accelerating condensation and improving the recovery effect of condensate; the tank area exhaust gas and the condensate generated by the second spray pipe 13 flow from the arc surface 98 into the flow channel 93 and are discharged from the drain hole 95.

[0027] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A formaldehyde production system tank farm tail gas recovery device, characterized in that: The system includes a treatment tower (1), a liquid storage area (4) at the bottom of the treatment tower (1), a first corrugated packing (101) above the liquid storage area (4), a first spray pipe (8) above the first corrugated packing (101), the liquid storage area (4) being connected to the input end of a first circulating pump (6) via a pipeline, the output end of the first circulating pump (6) being connected to the first spray pipe (8), a diverter (9) above the first spray pipe (8), an air inlet (94) inside the diverter (9), a second corrugated packing (102) above the air inlet (94), a second spray pipe (13) above the second corrugated packing (102), the diverter (9) being connected to a second circulating pump (11) via a pipeline, the output end of the second circulating pump (11) being connected to the second spray pipe (13), and a tank area recovery main pipe (14) on one side of the treatment tower (1), which is connected to an air supply line. The input end of the fan (16) is connected to the liquid storage area (4) through a pipeline. The diverter (9) includes a ventilation seat (91), which is fixedly connected to the inner wall of the middle part of the treatment tower (1). The air inlet (94) is located in the middle of the ventilation seat (91). A flow channel (93) is provided at the top of the ventilation seat (91), and a drain hole (95) is provided at the bottom of the flow channel (93). The drain hole (95) is connected to the second circulation pump (11). The input end is connected, and a flow guide ring (96) is installed on the top of the ventilation seat (91). The flow guide ring (96) includes a large diameter (97), a small diameter (99) and an arc surface (98). The large diameter (97) matches the outer diameter of the ventilation seat (91), and the small diameter (99) matches the inner diameter of the flow channel (93). A number of ventilation holes (92) are provided on the top of the ventilation seat (91), and a gap through which gas can pass is provided between the flow guide ring (96) and the ventilation seat (91).

2. The formaldehyde production system tank area tail gas recovery device according to claim 1, characterized in that, The arc-shaped surface (98) bends inward.

3. The formaldehyde production system tank area tail gas recovery device according to claim 1, characterized in that, The bottom of the drainage ring (96) is equipped with several mounting plates (910), and the end of the mounting plate (910) away from the ventilation seat (91) is installed on the top of the ventilation seat (91).

4. The formaldehyde production system tank area tail gas recovery device according to claim 1, characterized in that, The main recovery pipe (14) of the tank area is connected to the input end of the condensate recovery device (15), the output end of the condensate recovery device (15) is connected to the input end of the blower (16), the condensate of the condensate recovery device (15) is connected to the condensate tank (17) through a pipeline, the condensate tank (17) is connected to the water outlet pipe (18), and the bottom of the storage area (4) is connected to the water outlet pipe (18) through a pipeline.

5. The formaldehyde production system tank area tail gas recovery device according to claim 1, characterized in that, A flame arrester (2) is installed on the top of the treatment tower (1), and an exhaust gas processor (3) is installed at the output end of the flame arrester (2).

6. The formaldehyde production system tank area tail gas recovery device according to claim 1, characterized in that, A level gauge (21) is installed on the side wall of the liquid storage area (4).

7. The formaldehyde production system tank area tail gas recovery device according to claim 1, characterized in that, The liquid storage area (4) is connected to a pure water pipe (22).

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