Methanol waste gas purification and recovery device

Abstract

The methanol waste gas purification and recovery device comprises a buffer tank which is respectively communicated with a crane pipe and a tank field pipeline; the buffer tank is communicated with the washing tower through a pipeline; the washing tower is respectively communicated with the condensation defrosting tank I and the condensation defrosting tank II through pipelines; the condensation defrosting tank I and the condensation defrosting tank II are communicated with each other and then are communicated with the resin adsorption tower I and the resin adsorption tower II; the first resin adsorption tower and the second resin adsorption tower are communicated and then are communicated with the first power fan and the second power fan; the power fan I and the power fan II are communicated with each other and then are connected with the relay fan and the electric valve I; the relay fan is respectively communicated with the incinerator and the torch through an electric valve II and an electric valve III; the electric valve I is communicated with an inlet of the silencer; the collected organic waste gas enters a buffer tank to be subjected to buffer treatment, then enters a washing tower to be purified and recycled, enters a condensation defrosting tank to be treated after being treated by the washing tower, and is discharged into the atmosphere, a torch and an incinerator through a fan; the recycling rate is high; the purification treatment efficiency is high, and the operation cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas purification devices, and in particular relates to a methanol waste gas purification and recovery device. Background Art

[0002] With the rapid development of the national economy, environmental protection requirements are becoming increasingly stringent. For solid-roof tanks, a closed exhaust system should be installed, exhausting to pollution control equipment. Pollutant emissions must comply with exhaust pipe pollutant emission limits. Breathing valves in the methanol synthesis unit tank area can emit a methanol / VOCs mixture when the liquid level fluctuates or the temperature changes. This mixture is also emitted during loading in the loading area and when loading through the crane.

[0003] The name (document number CN207076326U) is a patent document for a device for recycling VOCs gas emitted from a fixed-top storage tank, comprising a fixed-top storage tank, a safety unit, a nitrogen supply pipe, an alkali washing unit, a recovery unit, a VOCs collecting main pipe, and a fuel gas pipeline network; the safety unit is fixedly mounted on the top of the fixed-top storage tank, and the nitrogen supply pipe is interlocked with the pressure gauge of the fixed-top storage tank through a nitrogen regulating valve, thereby ensuring that the fixed-top storage tank is in a slightly positive pressure state, and the safety nitrogen sealing pressure of the fixed-top storage tank is between 0 and 500 Pa; the VOCs collecting main pipe is connected to the fixed-top storage tank, the recovery unit, and the fuel gas pipeline network in sequence; the alkali washing unit is provided with an alkali washing pipeline, and the alkali washing pipeline is connected in parallel to the VOCs collecting main pipe. It has the following technical problems (disadvantages): the pressure of the supplemented nitrogen can be constant, but the ambient temperature is not constant, the flow rate is also unstable, and the pressure of the storage tank cannot be constant; the alkali washing unit can only neutralize and purify the acidic organic waste gas but cannot recycle it. The VOCs collection main pipe is connected to the fixed-top storage tank in turn. Since the tank body is under a slightly positive pressure, the collection volume is increased and the volatilization of raw materials is utilized. Direct connection to the tank body will increase the energy consumption of the system. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a methanol waste gas purification and recovery device, which has the characteristics of combining multiple treatment processes, high recovery rate, high purification efficiency and low operating cost.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a methanol waste gas purification and recovery device, including a buffer tank, the waste gas collection inlet end of the buffer tank is respectively connected to the crane pipe and the tank area pipeline; the waste gas collection pipeline outlet end of the buffer tank is connected to the waste gas collection pipeline inlet end of the washing tower through a pipeline; the waste gas collection pipeline inlet end of the washing tower 2 is respectively connected to the waste gas purification pipeline inlet end of the condensation defrost tank 1 and the condensation defrost tank 2 through a pipeline; the waste gas condensation pipeline inlet end of the condensation defrost tank 1 and the condensation defrost tank 2 is connected and then respectively connected to the resin adsorption tower 1 and the resin adsorption tower 2. The inlet end of the waste gas purification pipeline of the auxiliary tower 2 is connected; the outlet ends of the waste gas adsorption pipelines of the resin adsorption tower 1 and the resin adsorption tower 2 are connected and then respectively connected to the outlet ends of the waste gas adsorption pipelines of the power fan 1 and the power fan 2; the outlet ends of the waste gas adsorption pipelines of the power fan 1 and the power fan 2 are connected and then respectively connected to the outlet ends of the waste gas emission pipeline of the relay fan and the outlet end of the waste gas emission pipeline of the electric valve 1; the outlet end of the waste gas emission pipeline of the relay fan is connected to the incinerator and the torch through the electric valve 2 and the electric valve 3 respectively; the electric valve 1 is connected to the inlet of the muffler.

[0006] The water replenishment end of the washing tower is connected to the water outlet end of the circulating water heat exchange tank 2; the water inlet end of the circulating water heat exchange tank 2 is connected to the water replenishment source through a pipeline; the inlet end of the spray washing pipe of the washing tower is connected to the water outlet end of the circulating water heat exchange tank 1; the water inlet end of the circulating water heat exchange tank 1 is respectively connected to the water inlet ends of the circulating water pump 1 and the circulating water pump 2; the water outlet ends of the circulating water pump 1 and the circulating water pump 2 are connected and then respectively connected to the spray washing end and the spray pipe of the washing tower.

[0007] The heating air inlet end of the circulating water heat exchange tank 1 and the heating air inlet end of the circulating water heat exchange tank 2 are both connected to the output end of the shell and tube heat exchange tank; the air inlet end of the shell and tube heat exchange tank is connected to the nitrogen pipeline; the heating source end of the shell and tube heat exchange tank is connected to the steam pipe; the desorption ends of the resin adsorption tower 1 and the resin adsorption tower 2 are both connected to the nitrogen pipeline; the desorption ends of the resin adsorption tower 1 and the resin adsorption tower 2 are both connected to the output end of the shell and tube heat exchange tank; the heat source outlet end of the circulating water heat exchange tank 1, the heat source outlet end of the circulating water heat exchange tank 2, the heat source outlet end of the condensation and defrost tank 1, the heat source outlet end of the condensation and defrost tank 2, the heat source outlet end of the resin adsorption tower 1, and the heat source outlet end of the resin adsorption tower 2 are all connected to the heat source outlet end of the buffer tank.

[0008] The heat source inlet end of the condensation defrost tank one and the heat source inlet end of the condensation defrost tank two are both connected to the steam pipe; the heat source outlet end of the condensation defrost tank one and the heat source outlet end of the condensation defrost tank two are both connected to the heat source outlet end at the bottom of the shell and tube heat exchange tank; the heat source outlet end of the shell and tube heat exchange tank is connected to the water supply pipe inlet end of the circulating water heat exchange tank two.

[0009] The waste liquid outlet end of the buffer tank is respectively connected with the waste liquid inlet ends of the two liquid storage tanks; the waste liquid outlet end of the buffer tank, the waste liquid overflow end of the washing tower, the waste liquid outlet end of the condensation and defrost tank one, the waste liquid outlet end of the condensation and defrost tank two, the desorption waste liquid outlet end of the resin adsorption tower one and the desorption waste liquid outlet end of the resin adsorption tower two are all connected; the liquid outlet end of the diaphragm pump one is connected with the waste liquid inlet end of the liquid storage tank; a connecting pipe is provided at the bottom of the two liquid storage tanks, and a ball valve is provided between the connecting pipes; the left end of the ball valve one is connected with the waste liquid outlet end of the diaphragm pump two, and the waste liquid inlet end of the diaphragm pump two is connected with the high-concentration waste liquid outlet end of the washing tower; the water replenishment end of the washing tower is connected with the low-concentration waste liquid outlet end of the diaphragm pump three, and the low-concentration inlet end of the diaphragm pump three is connected with the right end of the ball valve one; the high-concentration outlet end of the liquid storage tank is connected with the distillation tower through a magnetic pump.

[0010] On the pipe at the exhaust gas inlet end of the buffer tank, there are provided two explosion-proof discs, an electrostatic jumper, an online combustible gas analyzer, a one-way valve, a flame arrester, a fourth electric valve, and a first manual valve in sequence to the left; on the pipe at the exhaust gas outlet end of the buffer tank, there are provided five electric valves, two pressure detectors, two temperature detectors, and six electric valves in sequence to the right.

[0011] A pressure detector 3 and a temperature detector 3 are provided on the connecting pipe between the buffer tank and the washing tower; a temperature detector 4 is provided on the pipe between the heated circulating water outlet of the circulating water heat exchange tank 1 and the washing tower; an electric ball valve 1 and an electric ball valve 2 are respectively provided on the pipes between the circulating water inlet of the circulating water heat exchange tank 1 and the circulating water pump 1 and the circulating water pump 2; an electric ball valve 3 and an electric ball valve 4 are respectively provided on the pipes between the circulating water inlet of the washing tower and the circulating water pump 1 and the circulating water pump 2.

[0012] A manual valve 2, a pressure detector 4, a temperature detector 5 and an electric valve 7 are provided on the pipeline between the shell and tube heat exchange tank and the circulating water heat exchange tank 1 and the circulating water heat exchange tank 2; a methanol online detector is provided at the circulating waste liquid portion of the washing tower; a temperature detector 8 is provided on the pipeline at the water source inlet end of the circulating water heat exchange tank 2; and an electric valve 8, a manual valve 3, a temperature detector 6, a pressure detector 5, a ball valve 2 and an electric ball valve 5 are provided on the pipeline at the nitrogen inlet end of the shell and tube heat exchange tank from right to left.

[0013] The nitrogen pipelines at the condensed nitrogen inlet ends of the condensation defrost tank one and the condensed nitrogen inlet ends of the condensation defrost tank two are provided with a manual valve four, an electric valve nine, a pressure detector six, a temperature detector seven, an electric ball valve eight and an electric ball valve nine.

[0014] The steam pipes at the defrosting heating steam inlet end of the condensing defrosting tank 1 and the defrosting heating steam inlet end of the condensing defrosting tank 2 are provided with electric ball valve 7, ball valve 3, pressure detector 7, temperature detector 9, electric ball valve 12 and electric ball valve 13;

[0015] The water supply pipe at the primary water supply inlet of the circulating water heat exchange tank 2 is provided with an electric ball valve 10, a ball valve 4, a pressure detector 8 and a temperature detector 10 from left to right;

[0016] A steam trap 1, an electric ball valve 6, an electric ball valve 11 and a steam trap 2 are provided on the pipeline between the steam outlet end of the tube heat exchange tank, the steam outlet end of the condenser defrost tank 1 and the steam outlet end of the condenser defrost tank 2;

[0017] The pipeline between the nitrogen inlet for desorption of heated exhaust gas of the tube-in-tube heat exchange tank and the resin adsorption tower 1 and the resin adsorption tower 2 is provided with an electric valve 10, a manual valve 5, a pressure detector 9, a temperature detector 11, an electric valve 11 and an electric valve 12;

[0018] The nitrogen condensation outlet end of the condensation and defrost tank 1 and the nitrogen condensation outlet end of the condensation and defrost tank 2 are respectively connected to the nitrogen inlet end of the buffer tank through the electric ball valve 15, the electric ball valve 16, the pressure detector 10 and the temperature detector 12; the nitrogen outlet end of the circulating water heat exchange tank 2 is connected to the nitrogen inlet end of the buffer tank through the electric valve 13; the nitrogen inlet end of the resin adsorption tower 1 is connected to the nitrogen inlet end of the buffer tank through the electric valve 18; the nitrogen inlet end of the resin adsorption tower 2 is connected to the nitrogen inlet end of the buffer tank through the electric valve 19;

[0019] The organic waste gas outlet of the condensation and defrost tank 1 is connected to the waste gas inlet of the one-way valve 2 through the electric valve 15, and the organic waste gas outlet of the condensation and defrost tank 2 is connected to the waste gas inlet of the one-way valve 2 through the electric valve 14; the waste gas outlet of the one-way valve 2 is connected to the waste gas inlet of the resin adsorption tower 1 through the electric valve 16; the waste gas outlet of the one-way valve 2 is connected to the waste gas inlet of the resin adsorption tower 2 through the electric valve 17;

[0020] The purified exhaust gas outlet of the resin adsorption tower 1 is connected to the electric valve 20; the purified exhaust gas outlet of the resin adsorption tower 2 is connected to the electric valve 21; the purified exhaust gas inlet of the power fan 1 is connected to the electric valve 23, and the purified exhaust gas outlet of the power fan 1 is connected to the electric valve 24; the purified exhaust gas outlet of the power fan 2 is connected to the electric valve 22; and the purified exhaust gas outlet of the power fan 2 is connected to the electric valve 25;

[0021] The waste liquid collection outlet of the buffer tank is connected to the waste liquid collection inlet of the diaphragm pump 1 through the electric ball valve 26 and the ball valve 5 in sequence; the overflow liquid outlet of the washing tower is connected to the waste liquid collection inlet of the diaphragm pump 1 through the electric ball valve 27 and the ball valve 6 in sequence; the waste liquid collection outlet of the resin adsorption tower 1 is connected to the waste liquid collection inlet of the diaphragm pump 1 through the electric ball valve 28 and the ball valve 7 in sequence; the waste liquid collection outlet of the resin adsorption tower 2 is connected to the waste liquid collection inlet of the diaphragm pump 1 through the electric ball valve 29 and the ball valve 8 in sequence; the high-concentration waste liquid discharge end of the washing tower is connected to the waste liquid collection inlet of the diaphragm pump 1 through the electric ball valve 27 and the ball valve 6 in sequence The movable ball valve 30 and the ball valve 9 are connected to the high-concentration waste liquid inlet of the diaphragm pump 2; the circulating water inlet of the washing tower is connected to the water supply outlet of the diaphragm pump 3 through the electric ball valve 31; a manual valve 6 is provided on the pipeline between the waste gas collection inlet of the buffer tank and the liquid storage tank; the defrost waste liquid outlet of the condensation defrost tank 1 is connected to the waste liquid collection inlet of the diaphragm pump 1 through the electric ball valve 32; the defrost waste liquid outlet of the condensation defrost tank 2 is connected to the waste liquid collection inlet of the diaphragm pump 1 through the electric ball valve 33; the high-concentration waste liquid outlet of the magnetic pump is connected to the distillation tower through the ball valve 10.

[0022] The beneficial effects of the utility model are:

[0023] The present invention combines multiple treatment processes, resulting in high recycling rates, high purification efficiency, and low operating costs. A scrubber is used to collect water-soluble organic waste gas, while condensation is used to collect high-dew-point waste gas. Resin is used to absorb water-insoluble, low-dew-point organic waste gas. This results in high recycling rates, high treatment efficiency, and low operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the waste gas collection and treatment process of the utility model.

[0025] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 3 This is a structural diagram of the waste gas collection inlet of the utility model.

[0027] Figure 4 This is a schematic diagram of the structure of the first-stage purification and recovery of waste gas in this utility model.

[0028] Figure 5 This is a structural diagram of the circulating water heating system of the utility model.

[0029] Figure 6 This is a schematic diagram of the structure of the secondary condensation recovery of waste gas in this utility model.

[0030] Figure 7 This is a structural diagram of the water replenishment of the washing tower of the utility model.

[0031] Figure 8 This is a schematic diagram of the structure of the utility model for recovering condensed water after steam use.

[0032] Figure 9 It is a structural schematic diagram of the defrosting process of the utility model.

[0033] Figure 10 This is a schematic diagram of the structure of the utility model for collecting nitrogen after use.

[0034] Figure 11 This is a schematic diagram of the structure of the utility model in which the purified waste gas meets the emission standards.

[0035] Figure 12 This is a schematic diagram of the structure of the waste liquid collection, recycling and discharge system of the present invention.

[0036] In the figure: 1-buffer tank; 2-washing tower; 3-condenser defrost tank 1; 4-condenser defrost tank 2; 5-resin adsorption tower 1; 6-resin adsorption tower 2; 7-power fan 1; 8-power fan 2; 9-relay fan; 10-tube heat exchange tank; 11-crane pipe; 12-tank area; 13-circulating water heat exchange tank 1; 14-circulating water heat exchange tank 2; 15-liquid storage tank; 16-diaphragm pump 1; 17-diaphragm pump 2; 18-diaphragm pump 3; 19-magnetic pump; 20-fan outlet silencer; 21-electric valve 1; 22-electric valve 2; 23-electric valve 3; 24-circulating water pump 1; 25-circulating water pump 2; 26-ball valve 1; 27-explosion vent disc 1; 28-pressure detector 1; 29-temperature detector 1; 30-vent Bursting disc 2; 31-Electric jumper; 32-Online combustible gas analyzer; 33-One-way valve 1; 34-Flame arrester; 35-Electric valve 4; 36-Manual valve 1; 37-Electric valve 5; 38-Pressure detector 2; 39-Temperature detector 2; 40-Pressure detector 3; 41-Temperature detector 3; 42-Temperature detector 4; 43-Electric ball valve 1; 44-Electric ball valve 2; 45-Electric ball valve 3; 46-Electric ball valve 4; 47-Electric valve 6; 48-Manual valve 2; 49-Pressure detector 4; 50-Temperature detector 5; 51-Methanol online detector; 52-Electric valve 7; 53-Electric ball valve 5; 54-Ball valve 2; 55-Pressure detector 5; 56-Temperature detector 6; 57-Manual valve 3; 58-Electric valve eight; 59-Manual valve four; 60-Electric valve nine; 61-Pressure detector six; 62-Temperature detector seven; 63-Electric ball valve six; 64-Steam trap one; 65-Temperature detector eight; 66-Electric ball valve seven; 67-Ball valve three; 68-Pressure detector seven; 69-Temperature detector nine; 70-Electric ball valve eight; 71-Electric ball valve nine; 72-Electric ball valve ten; 73-Ball valve four; 74-Pressure detector eight; 75-Temperature detector ten; 76-Electric ball valve eleven; 77-Steam trap two; 78-Electric valve seventeen; 79-Electric valve eighteen; 80-Electric valve nineteen; 81-Electric valve fifteen; 82-Electric ball valve twelve; 83-Electric ball valve thirteen; 84-Electric valve ten; 85-Manual valve five 86-pressure detector 9; 87-temperature detector 11; 88-electric valve 11; 89-electric valve 12; 90-electric ball valve 15; 91-electric ball valve 16; 92-pressure detector 10; 93-temperature detector 12; 94-electric valve 13; 95-electric valve 14; 96-check valve 2; 97-electric valve 16; 98-electric valve 20; 99-electric valve 21; 100-electric valve 22; 101-electric valve 23; 102-electric valve 24; 103-electric valve 25; 104-electric ball valve 26; 105-ball valve 5; 106-electric ball valve 27; 107-ball valve 6; 108-electric ball valve 28; 109-ball valve 7; 110-electric ball valve 29;111-Ball valve 8; 112-Electric ball valve 30; 113-Ball valve 9; 114-Electric ball valve 31; 115-Manual valve 6; 116-Ball valve 10; 117-Electric ball valve 32; 118-Electric ball valve 33; 119-Pressure tester 11. DETAILED DESCRIPTION

[0037] The structural principle and working principle of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

[0038] See also Figure 1-2 A methanol waste gas purification and recovery device includes a buffer tank 1, the waste gas collection inlet end of the buffer tank 1 is connected to the crane pipe 11 and the tank area pipeline 12 respectively; the waste gas collection pipeline outlet end of the buffer tank 1 is connected to the waste gas collection pipeline inlet end of the washing tower 2 through a pipeline; the waste gas purification outlet end of the washing tower 2 is connected to the waste gas purification pipeline inlet end of the condensation and defrosting tank 1 3 and the condensation and defrosting tank 2 4 respectively through a pipeline; the waste gas condensation pipeline outlet end of the condensation and defrosting tank 1 3 and the condensation and defrosting tank 2 4 is connected and then respectively connected to the waste gas condensation pipeline of the resin adsorption tower 1 5 and the resin adsorption tower 2 6. The outlet ends of the waste gas adsorption pipes of resin adsorption tower 1 5 and resin adsorption tower 2 6 are connected and then respectively connected to the outlet ends of the waste gas adsorption pipes of power fan 1 7 and power fan 2 8; the outlet ends of the waste gas emission pipes of power fan 1 7 and power fan 2 8 are connected and then respectively connected to the outlet ends of the waste gas emission pipes of relay fan 9 and the outlet ends of the waste gas emission pipes of electric valve 1 21; the outlet ends of the waste gas emission pipes of relay fan 9 are respectively connected to the incinerator and the torch through electric valve 2 22 and electric valve 3 23; the electric valve 1 21 is connected to the inlet of the muffler 20.

[0039] The water replenishment end of the washing tower 2 is connected to the water outlet end of the circulating water heat exchange tank 2 14; the water inlet end of the circulating water heat exchange tank 2 14 is connected to the water replenishment source through a pipeline; the inlet end of the spray washing pipe of the washing tower 2 is connected to the water outlet end of the circulating water heat exchange tank 1 13; the water inlet end of the circulating water heat exchange tank 1 13 is respectively connected to the water inlet ends of the circulating water pump 1 24 and the circulating water pump 2 25; the water outlet ends of the circulating water pump 1 24 and the circulating water pump 2 25 are connected and then respectively connected to the spray washing end and the spray pipe end of the washing tower 2.

[0040] The heating air inlet end of the circulating water heat exchange tank 13 and the heating air inlet end of the circulating water heat exchange tank 2 14 are both connected to the output end of the shell and tube heat exchange tank 10; the air inlet end of the shell and tube heat exchange tank 10 is connected to the nitrogen pipeline; the heating source end of the shell and tube heat exchange tank 10 is connected to the steam pipe; the desorption ends of the resin adsorption tower 15 and the resin adsorption tower 2 6 are both connected to the nitrogen pipeline; the desorption ends of the resin adsorption tower 15 and the resin adsorption tower 2 6 are both connected to the output end of the shell and tube heat exchange tank 10; the heat source outlet end of the circulating water heat exchange tank 13, the heat source outlet end of the circulating water heat exchange tank 2 14, the heat source outlet end of the condensation and defrost tank 13, the heat source outlet end of the condensation and defrost tank 2 4, the heat source outlet end of the resin adsorption tower 15, and the heat source outlet end of the resin adsorption tower 2 6 are all connected to the heat source outlet end of the buffer tank 1.

[0041] The heat source inlet end of the condensation defrost tank 1 3 and the heat source inlet end of the condensation defrost tank 2 4 are both connected to the steam pipe; the heat source outlet end of the condensation defrost tank 1 3 and the heat source outlet end of the condensation defrost tank 2 4 are both connected to the heat source outlet end at the bottom of the shell and tube heat exchange tank 10; the heat source outlet end of the shell and tube heat exchange tank 10 is connected to the water supply pipe inlet end of the circulating water heat exchange tank 2 14.

[0042] The waste liquid outlet end of the buffer tank 1 is respectively connected to the waste liquid inlet end of the two liquid storage tanks 15; the waste liquid outlet end of the buffer tank 1, the waste liquid overflow end of the washing tower 2, the waste liquid outlet end of the condensation and defrosting tank 3, the waste liquid outlet end of the condensation and defrosting tank 2 4, the waste liquid outlet end of the resin adsorption tower 1 5 and the waste liquid outlet end of the resin adsorption tower 2 6 are all connected to the waste liquid inlet end of the diaphragm pump 16, and the waste liquid outlet end of the diaphragm pump 16 is connected to the waste liquid inlet end of the liquid storage tank 15; the two storage tanks A connecting pipe is provided at the bottom of the liquid tank 15, and a ball valve 26 is provided on the connecting pipe; the left end of the ball valve 26 is connected to the waste liquid outlet end of the diaphragm pump 2 17, and the waste liquid inlet end of the diaphragm pump 2 17 is connected to the high-concentration waste liquid outlet end of the washing tower 2; the water supply end of the washing tower 2 is connected to the low-concentration waste liquid outlet end of the diaphragm pump 3 18, and the low-concentration waste liquid inlet end of the diaphragm pump 3 18 is connected to the right end of the ball valve 26; the high-concentration outlet end of the liquid storage tank 15 is connected to the distillation tower through the magnetic pump 19.

[0043] See also Figure 3 On the pipeline at the exhaust gas inlet end of the buffer tank 1, there are provided with explosion relief disc 2 30, electrostatic jumper 31, combustible gas online analyzer 32, one-way valve 1 33, flame arrester 34, electric valve 4 35, and manual valve 1 36 in sequence to the left; on the pipeline at the exhaust gas outlet end of the buffer tank 1, there are provided with electric valve 5 37, pressure detector 2 38, temperature detector 2 39, and electric valve 6 47 in sequence to the right; a pressure detector 11 119 is also provided on the tank area pipeline 12 between the electric valve 4 35 and the flame arrester 34.

[0044] See also Figure 4 The connecting pipe between the buffer tank 1 and the washing tower is provided with a pressure detector 3 40 and a temperature detector 3 41; the pipe between the circulating water outlet end of the circulating water heat exchange tank 13 and the washing tower 2 is provided with a temperature detector 42; the pipe between the circulating water inlet end of the circulating water heat exchange tank 13 and the circulating water pump 1 24 and the circulating water pump 2 25 is provided with an electric ball valve 1 43 and an electric ball valve 2 44 respectively; the pipe between the circulating water inlet end of the washing tower 2 and the circulating water pump 1 24 and the circulating water pump 2 25 is provided with an electric ball valve 3 45 and an electric ball valve 4 46 respectively.

[0045] Referring to 5 , a manual valve 2 48 , a pressure detector 4 49 , a temperature detector 5 50 and an electric valve 7 52 are provided on the pipeline between the shell and tube heat exchange tank 10 and the circulating water heat exchange tank 1 13 and the circulating water heat exchange tank 2 14 ; a methanol online detector 51 is provided at the circulating waste liquid portion of the washing tower 2 ; a temperature detector 8 65 is provided on the pipeline at the water source inlet end of the circulating water heat exchange tank 2 14 ; an electric valve 8 58 , a manual valve 3 57 , a temperature detector 6 56 , a pressure detector 55 , a ball valve 2 54 and an electric ball valve 5 53 are provided on the pipeline at the nitrogen inlet end of the shell and tube heat exchange tank 10 in sequence from right to left.

[0046] See also Figure 6 The nitrogen pipelines at the nitrogen inlet ends of the condensing and defrosting tank 1 3 and the nitrogen inlet ends of the condensing and defrosting tank 2 4 are provided with a manual valve 4 59 , an electric valve 9 60 , a pressure detector 6 61 , a temperature detector 7 62 , an electric ball valve 8 70 and an electric ball valve 9 71 .

[0047] See also Figure 9 The steam pipes at the defrost heating steam inlet end of the condensing defrost tank 1 3 and the defrost heating steam inlet end of the condensing defrost tank 2 4 are provided with electric ball valve 7 66, ball valve 3 67, pressure detector 7 68, temperature detector 9 69, electric ball valve 12 82 and electric ball valve 13 83.

[0048] See also Figure 7 On the water supply pipe at the primary water source water supply inlet end of the circulating water heat exchange tank 2 14, an electric ball valve 10 72, a ball valve 4 73, a pressure detector 8 74 and a temperature detector 10 75 are provided from left to right.

[0049] See also Figure 8 The steam outlet end after steam heating of the shell and tube heat exchange tank 10 is provided with a steam trap 64 and an electric ball valve 63; the steam outlet end after steam heating of the condensing and defrosting tank 1 3 and the steam outlet end after steam heating of the condensing and defrosting tank 2 4 are respectively provided with an electric ball valve 11 76 and a steam trap 2 77.

[0050] See also Figure 10The pipeline between the nitrogen inlet end for desorption of the heated exhaust gas of the shell and tube heat exchange tank 10 and the resin adsorption tower 1 5 and the resin adsorption tower 2 6 is provided with an electric valve 10 84, a manual valve 5 85, a pressure detector 9 86, a temperature detector 11 87, an electric valve 11 88 and an electric valve 12 89.

[0051] See also Figure 10 The nitrogen condensation outlet end of the condensation and defrost tank 1 3 and the nitrogen condensation outlet end of the condensation and defrost tank 2 4 are respectively connected to the nitrogen inlet end of the buffer tank 1 through the electric ball valve 15 90, the electric ball valve 16 91, the pressure detector 10 92 and the temperature detector 12 93; the nitrogen outlet end of the circulating water heat exchange tank 2 14 is connected to the nitrogen inlet end of the buffer tank 1 through the electric valve 13 94; the nitrogen inlet end of the resin adsorption tower 1 5 is connected to the nitrogen inlet end of the buffer tank 1 through the electric valve 18 79; the nitrogen inlet end of the resin adsorption tower 2 6 is connected to the nitrogen inlet end of the buffer tank 1 through the electric valve 19 80.

[0052] See also Figure 10 The organic waste gas outlet end of the condensation and defrost tank 3 is connected to the waste gas inlet end of the one-way valve 2 96 through the electric valve 15 81, and the organic waste gas outlet end of the condensation and defrost tank 2 4 is connected to the waste gas inlet end of the one-way valve 2 96 through the electric valve 16 97; the waste gas outlet end of the one-way valve 2 96 is connected to the waste gas inlet end of the resin adsorption tower 1 5 through the electric valve 17 78.

[0053] See also Figure 11 The purified waste gas outlet end of the resin adsorption tower 1 5 is connected to the electric valve 20 98; the purified waste gas outlet end of the resin adsorption tower 2 6 is connected to the electric valve 21 99; the purified waste gas inlet end of the power fan 1 7 is connected to the electric valve 23 101, and the purified waste gas outlet end of the power fan 1 7 is connected to the electric valve 24 102; the purified waste gas outlet end of the power fan 2 8 is connected to the electric valve 22 100; the purified waste gas outlet end of the power fan 2 8 is connected to the electric valve 25 103.

[0054] See also Figure 12The waste liquid collection outlet of the buffer tank 1 is connected to the waste liquid collection inlet of the diaphragm pump 16 in sequence through the electric ball valve 26 104 and the ball valve 5 105; the overflow liquid outlet of the washing tower 2 is connected to the waste liquid collection inlet of the diaphragm pump 16 in sequence through the electric ball valve 27 106 and the ball valve 6 107; the waste liquid collection outlet of the resin adsorption tower 15 is connected to the waste liquid collection inlet of the diaphragm pump 16 in sequence through the electric ball valve 28 108 and the ball valve 7 109; the waste liquid collection outlet of the resin adsorption tower 26 is connected to the waste liquid collection inlet of the diaphragm pump 16 in sequence through the electric ball valve 29 110 and the ball valve 8 111; the high-concentration waste liquid discharge end of the washing tower 2 is connected to the waste liquid collection inlet of the diaphragm pump 16 in sequence through The electric ball valve thirty 112 and the ball valve nine 113 are connected to the high-concentration waste liquid inlet of the diaphragm pump two 17; the circulating water inlet of the washing tower 2 is connected to the water supply outlet of the diaphragm pump three 18 through the electric ball valve thirty-one 114; a manual valve six 115 is provided on the pipeline between the waste gas collection inlet of the buffer tank 1 and the liquid storage tank 15; the waste gas collection inlet of the condensation and defrost tank one 3 is connected to the waste liquid collection inlet of the diaphragm pump one 16 through the electric ball valve thirty-two 117; the defrost waste liquid outlet of the condensation and defrost tank two 4 is connected to the waste liquid collection inlet of the diaphragm pump one 16 through the electric ball valve thirty-three 118; the high-concentration waste liquid outlet of the magnetic pump 19 is connected to the distillation tower through the ball valve ten 116.

[0055] In this embodiment, temperature detectors one to eleven are all temperature sensors.

[0056] The working principle of this utility model is:

[0057] Exhaust gas collection and treatment workflow:

[0058] The organic waste gas generated by crane loading / unloading is collected through the collection and aggregation pipeline of the crane pipe 11, the system pressure balance air volume is adjusted through a manual valve 36, and the crane pipe waste gas is forcibly cut off or blocked through the electric valve 4 35. The organic waste gas generated by crane loading / unloading is collected through the collection and aggregation pipeline of the tank area 12, the system pressure balance air volume is adjusted through a manual valve 36, and the crane pipe waste gas is forcibly cut off or blocked through the electric valve 4 35. The pressure sensor adjusts the amount of waste gas collected in the tank area. The collected organic waste gas enters the flame arrester 34, the one-way valve 33 (the one-way valve is an explosion-proof valve), the combustible gas online analyzer 32, the explosion-proof plate 2 30 through the aggregation pipeline, and then enters the buffer tank 1. Among them, the flame arrester 34, the one-way valve 33, the combustible gas online analyzer 32, and the explosion-proof plate 2 30 are safety measures that can effectively prevent fire or explosion from causing damage to Party A or the oil and gas purification and recovery equipment, thereby reducing property losses. Buffer tank 1's primary function is to relieve exhaust gas pressure, reduce exhaust gas flow rate, and collect large particles of oil, gas, and water mist. Explosion vent 27 is the buffer tank's weakest point, providing pressure relief in the event of an abnormality. Pressure detector 28 (pressure sensor) and temperature detector 29 (temperature sensor) are installed on the buffer tank to monitor the pressure in real time. The buffered organic waste gas is then piped into scrubber 2, where it is purified and recovered for methanol (100% methanol dissolved in water). Scrubber 2 is equipped with auxiliary instrumentation: a real-time methanol concentration meter and a liquid level meter. When the set value is exceeded, the liquid is discharged for recovery / recycling. After treatment in the scrubber, the organic waste gas enters condenser-defrost tank 1 and condenser-defrost tank 2, condensing the low-dew-point organic waste gas and collecting the condensed organic solution through defrosting. After the previous two stages of treatment, the organic waste gas now contains no water-soluble methanol and low-dew-point organic waste gas. This part of the waste gas finally enters the resin adsorption tower 1 5 and the resin adsorption tower 2 6, and is adsorbed by the resin adsorbent to evolve into other components of the organic waste gas. The purified organic waste gas that meets the standards is connected to the power fan 1 7, the power fan 2 8, and the relay fan 9 through a pipeline and discharged into the atmosphere, flare, and incinerator.

[0059] Scrubber 2's circulating spraying, water replenishment, and drainage processes require additional auxiliary facilities. For the replenishment process, diaphragm pump 3 18 is prioritized to replenish low-concentration waste liquid from storage tank 15. If the set liquid level is not reached, water is automatically replenished via electric ball valve 10 72, ball valve 4 73, pressure detector 8 74 (pressure detector 8 is a pressure sensor), temperature detector 10 75, and circulating water heat exchanger 2 14. For the circulating spraying process, organic waste gas within scrubber 2 is purified and recovered by gas-liquid mixing and dissolution via pipelines connecting circulating water heat exchanger 1 13, circulating water pump 1 24, circulating water pump 2 25 (one active, one standby, automatically switched by time), process control valves 43 / 44 / 45 / 46 (electric ball valve 1 43, electric ball valve 2 44, electric ball valve 3 45, and electric ball valve 4 46), and temperature detector 4 42. This takes into account the physical properties of water freezing and solidifying at low temperatures. Makeup and circulating water are used through manual valve 2 (48), pressure detector 4 (49), temperature detector 5 (50), electric valve 7 (52), electric ball valve 5 (53), ball valve 2 (54), pressure detector 5 (55), temperature detector 6 (56), manual valve 3 (57), electric valve 8 (58), manual valve 4 (59), electric valve 9 (60), pressure detector 6 (61), temperature detector 7 (62), electric ball valve 6 (63), steam trap 1 (64), temperature detector 8 (65), electric ball valve 7 (66), ball valve 3 (67), pressure detector 7 (68), and temperature detector 9 (69). Steam-heated nitrogen is then used to heat the circulating and makeup water. This nitrogen then heats the circulating water heat exchange tank 1 (13) and circulating water heat exchange tank 2 (14), preventing freezing. The wash tower drainage is divided into two parts: one for high-level overflow and the other for the recovered, high-methanol-concentration liquid. The high-level overflow liquid is collected, and the signal from the scrubber's liquid level gauge is sent through electric ball valve 27 106, ball valve 6 107 (ball valve 6 is a manual valve), and diaphragm pump 16, then discharged into the low-concentration section of liquid storage tank 15. Recycled liquid is discharged through electric ball valve 30 112, ball valve 9 113 (ball valve 9 is a manual valve), and diaphragm pump 2 17 into the high-concentration section of liquid storage tank 15. It is then sent to the recycling tank via magnetic pump 19 and ball valve 10 116.

[0060] Condensation Defrost Tank 1 (3) and Condensation Defrost Tank 2 (4) operate as a standby tank, with automatic switching via time control. Their operating principles primarily encompass two aspects: the condensation process and the defrosting process. During condensation, low-dew-point organic waste gas is condensed via process valves (manual valve 4 (59), electric valve 9 (60), pressure detector 6 (61), temperature detector 7 (62), electric ball valve 8 (70), electric ball valve 9 (71), and pipes connecting Condensation Defrost Tank 1 (3) and Condensation Defrost Tank 2 (4). The defrosting process thaws the frost within Condensation Defrost Tank 1 (3) and Condensation Defrost Tank 2 (4) into liquid. Frozen nitrogen is delivered to the front-end buffer tank (1) via valves / instruments (electric ball valve 15 (90), electric ball valve 16 (91), pressure detector 10 (92), and temperature detector 12 (93). This process primarily uses process valves / instruments (electric ball valve 7 66, ball valve 3 67, pressure detector 7 68, temperature detector 9 69, electric ball valve 12 82, and electric ball valve 13 83) to deliver steam into condenser defrost tank 13 and condenser defrost tank 2 4 to defrost the frost. The thawed liquid is then connected to diaphragm pump 16 via pipelines through electric ball valve 32 117 and electric ball valve 33 118, sending the thawed liquid to liquid storage tank 15 for low-concentration measurement.

[0061] Resin Adsorption Tower 15 and Resin Adsorption Tower 26 operate in a timed, one-for-use, standby configuration. They operate in two modes: adsorption and desorption. During the organic waste gas adsorption process, waste gas enters through electric valve 17 78 and electric valve 16 97 and is discharged through electric valve 20 98 and electric valve 21 99 after purification and adsorption. While one Resin Adsorption Tower 15 or Resin Adsorption Tower 26 is adsorbing, the other is desorbing. Desorption uses steam-heated nitrogen to heat the resin within the resin tower, desorbing the organic waste gas liquid from the resin for recovery and reuse. During desorption, steam-heated nitrogen is used to heat the resin within the resin tower and desorb the organic waste gas liquid from the resin via pipeline-connected valves / instruments: electric valve 10 84, manual valve 5 85, pressure detector 9 86, temperature detector 11 87, electric valve 11 88, and electric valve 12 89. After desorption consumes the nitrogen's heat source, the nitrogen enters buffer tank 1 through electric valve 18 79, electric valve 19 80, and pipeline connections. The desorbed waste liquid passes through valves electric ball valve 28 108, ball valve 7 109, electric ball valve 29 110, and ball valve 8 111, and is then sent into the low-concentration side of the liquid storage tank 15 through diaphragm pump 16.

[0062] Power fan 17, power fan 28, and relay fan 9 provide power for the system. All fans use negative pressure fans to effectively prevent leakage of organic waste gas during the collection process, which can cause secondary pollution. Power fan 17 and power fan 28 are used as one for use and one for standby, and are automatically switched by time control. After the waste gas is purified by resin adsorption tower 15 and resin adsorption tower 26 and meets the standards, it enters through electric valve 2098 and electric valve 2199, and is discharged through electric valve 121 and fan outlet silencer 20 (the chimney height is greater than 15 meters). When the system's abnormal emissions exceed the standard (production process changes, the concentration of waste gas from the tank area / crane pipe is too high), close electric valve 121, open electric valve 22 / electric valve 323, and send the excess organic waste gas to Party A's torch / incinerator to incinerate the excess waste gas for deep purification.

Claims

1. A methanol waste gas purification and recovery device, comprising a buffer tank (1), characterized in that: The waste gas collection inlet of the buffer tank (1) is respectively connected to the crane pipe (11) and the tank area pipeline (12); the waste gas collection pipeline outlet of the buffer tank (1) is connected to the waste gas collection pipeline inlet of the washing tower (2) through a pipeline; the waste gas collection pipeline inlet of the washing tower (2) is respectively connected to the waste gas purification pipeline inlet of the condensation defrost tank 1 (3) and the condensation defrost tank 2 (4) through a pipeline; the waste gas condensation pipeline inlet of the condensation defrost tank 1 (3) and the condensation defrost tank 2 (4) is connected and then connected to the waste gas purification pipeline inlet of the resin adsorption tower 1 (5) and the resin adsorption tower 2 (6); the waste gas condensation pipeline inlet of the resin adsorption tower 1 (5) and the resin adsorption tower 2 (6) is respectively connected; (5) and the outlet end of the waste gas adsorption pipe of the resin adsorption tower 2 (6) are connected and then connected to the outlet end of the waste gas adsorption pipe of the power fan 1 (7) and the power fan 2 (8); the outlet end of the waste gas adsorption pipe of the power fan 1 (7) and the power fan 2 (8) are connected and then connected to the outlet end of the waste gas discharge pipe of the relay fan (9) and the outlet end of the waste gas discharge pipe of the electric valve 1 (21); the outlet end of the waste gas discharge pipe of the relay fan (9) is connected to the incinerator and the torch through the electric valve 2 (22) and the electric valve 3 (23); the electric valve 1 (21) is connected to the inlet of the muffler (20).

2. A methanol waste gas purification and recovery device according to claim 1, characterized in that: The water supply end of the washing tower (2) is connected to the water outlet end of the second circulating water heat exchange tank (14); the water inlet end of the second circulating water heat exchange tank (14) is connected to the water supply source through a pipeline; the inlet end of the spray washing pipe of the washing tower (2) is connected to the water outlet end of the first circulating water heat exchange tank (13); the water inlet end of the first circulating water heat exchange tank (13) is respectively connected to the water inlet end of the first circulating water pump (24) and the second circulating water pump (25); the water outlet ends of the first circulating water pump (24) and the second circulating water pump (25) are connected and then respectively connected to the spray washing end and the spray pipe of the washing tower (2).

3. A methanol waste gas purification and recovery device according to claim 2, characterized in that: The heating air inlet end of the circulating water heat exchange tank 1 (13) and the heating air inlet end of the circulating water heat exchange tank 2 (14) are both connected to the output end of the tube-and-tube heat exchange tank (10); the air inlet end of the tube-and-tube heat exchange tank (10) is connected to the nitrogen pipeline; the heating source end of the tube-and-tube heat exchange tank (10) is connected to the steam pipe; the desorption ends of the resin adsorption tower 1 (5) and the resin adsorption tower 2 (6) are both connected to the nitrogen pipeline; the desorption ends of the resin adsorption tower 1 (5) and the resin adsorption tower 2 (6) are both connected to the output end of the tube-and-tube heat exchange tank (10); the heat source outlet end of the circulating water heat exchange tank 1 (13), the heat source outlet end of the circulating water heat exchange tank 2 (14), the heat source outlet end of the condensation and defrosting tank 1 (3), the heat source outlet end of the condensation and defrosting tank 2 (4), the heat source outlet end of the resin adsorption tower 1 (5), and the heat source outlet end of the resin adsorption tower 2 (6) are all connected to the heat source outlet end of the buffer tank (1).

4. A methanol waste gas purification and recovery device according to claim 1, characterized in that: The heat source inlet end of the condensation defrost tank one (3) and the heat source inlet end of the condensation defrost tank two (4) are both connected to the steam pipe; the heat source outlet end of the condensation defrost tank one (3) and the heat source outlet end of the condensation defrost tank two (4) are both connected to the heat source outlet end at the bottom of the shell and tube heat exchange tank (10); the heat source outlet end of the shell and tube heat exchange tank (10) is connected to the water supply pipe inlet end of the circulating water heat exchange tank two (14).

5. The methanol waste gas purification and recovery device according to claim 1, characterized in that: The waste liquid outlet of the buffer tank (1) is respectively connected to the waste liquid inlet of the two liquid storage tanks (15); the waste liquid outlet of the buffer tank (1), the waste liquid overflow end of the washing tower (2), the waste liquid outlet of the condensation and defrosting tank (3), the waste liquid outlet of the condensation and defrosting tank (4), the desorption waste liquid outlet of the resin adsorption tower (5) and the desorption waste liquid outlet of the resin adsorption tower (6) are all connected; the liquid outlet of the diaphragm pump (16) is connected to the waste liquid inlet of the liquid storage tank (15); the two liquid storage tanks (15) A connecting pipe is provided at the bottom, and a ball valve (26) is provided between the connecting pipes; the left end of the ball valve (26) is connected to the waste liquid outlet end of the diaphragm pump (17), and the waste liquid inlet end of the diaphragm pump (17) is connected to the high-concentration waste liquid outlet end of the washing tower (2); the water supply end of the washing tower (2) is connected to the low-concentration waste liquid outlet end of the diaphragm pump (18), and the low-concentration inlet end of the diaphragm pump (18) is connected to the right end of the ball valve (26); the high-concentration outlet end of the liquid storage tank (15) is connected to the distillation tower through the magnetic pump (19).

6. The methanol waste gas purification and recovery device according to claim 1, characterized in that: The pipeline at the exhaust gas inlet end of the buffer tank (1) is provided with a second explosion relief disc (30), an electrostatic jumper (31), a combustible gas online analyzer (32), a one-way valve (33), a flame arrester (34), a fourth electric valve (35), and a first manual valve (36) in sequence to the left; the pipeline at the exhaust gas outlet end of the buffer tank (1) is provided with a fifth electric valve (37), a second pressure detector (38), a second temperature detector (39), and a sixth electric valve (47) in sequence to the right.

7. The methanol waste gas purification and recovery device according to claim 1, characterized in that: A pressure detector 3 (40) and a temperature detector 3 (41) are provided on the communicating pipe between the buffer tank (1) and the washing tower; a temperature detector 4 (42) is provided on the pipe between the heated circulating water outlet of the circulating water heat exchange tank 1 (13) and the washing tower (2); an electric ball valve 1 (43) and an electric ball valve 2 (44) are provided on the pipes between the circulating water inlet of the circulating water heat exchange tank 1 (13) and the circulating water pump 1 (24) and the circulating water pump 2 (25); and an electric ball valve 3 (45) and an electric ball valve 4 (46) are provided on the pipes between the circulating water inlet of the washing tower (2) and the circulating water pump 1 (24) and the circulating water pump 2 (25).

8. The methanol waste gas purification and recovery device according to claim 3, characterized in that: The pipelines between the shell and tube heat exchange tank (10) and the first circulating water heat exchange tank (13) and the second circulating water heat exchange tank (14) are provided with a second manual valve (48), a fourth pressure detector (49), a fifth temperature detector (50) and a seventh electric valve (52); the circulating waste liquid portion of the washing tower is provided with a methanol online detector (51); the pipeline at the water source inlet end of the second circulating water heat exchange tank (14) is provided with an eighth temperature detector (65); the pipeline at the nitrogen inlet end of the shell and tube heat exchange tank (10) is provided with an eighth electric valve (58), a third manual valve (57), a sixth temperature detector (56), a fifth pressure detector (55), a second ball valve (54) and a fifth electric ball valve (53) in sequence from right to left.

9. A methanol waste gas purification and recovery device according to claim 1 or 4, characterized in that: Manual valve four (59), electric valve nine (60), pressure detector six (61), temperature detector seven (62), electric ball valve eight (70) and electric ball valve nine (71) are provided on the nitrogen pipelines at the condensation nitrogen inlet end of the condensation defrost tank one (3) and the condensation nitrogen inlet end of the condensation defrost tank two (4).

10. The methanol waste gas purification and recovery device according to claim 3, characterized in that: The steam pipes at the defrosting heating steam inlet end of the condensing defrosting tank 1 (3) and the defrosting heating steam inlet end of the condensing defrosting tank 2 (4) are provided with electric ball valve 7 (66), ball valve 3 (67), pressure detector 7 (68), temperature detector 9 (69), electric ball valve 12 (82) and electric ball valve 13 (83); The water supply pipe at the primary water supply inlet of the circulating water heat exchange tank 2 (14) is provided with an electric ball valve 10 (72), a ball valve 4 (73), a pressure detector 8 (74) and a temperature detector 10 (75) from left to right; A steam trap 1 (64), an electric ball valve 6 (63), an electric ball valve 11 (76) and a steam trap 2 (77) are provided on the pipeline between the steam outlet end of the steam-heated steam of the tube-in-tube heat exchange tank (10), the steam outlet end of the steam-heated steam of the condensing and defrosting tank 1 (3) and the steam outlet end of the condensing and defrosting tank 2 (4); The pipeline between the nitrogen inlet for desorption of the heated exhaust gas of the tube-in-tube heat exchange tank (10) and the resin adsorption tower 1 (5) and the resin adsorption tower 2 (6) is provided with an electric valve 10 (84), a manual valve 5 (85), a pressure detector 9 (86), a temperature detector 11 (87), an electric valve 11 (88) and an electric valve 12 (89); The nitrogen condensation outlet end of the condensation and defrosting tank 1 (3) and the nitrogen condensation outlet end of the condensation and defrosting tank 2 (4) are respectively connected to the nitrogen inlet end of the buffer tank (1) through the electric ball valve 15 (90), the electric ball valve 16 (91), the pressure detector 10 (92) and the temperature detector 12 (93); the nitrogen outlet end of the circulating water heat exchange tank 2 (14) is connected to the nitrogen inlet end of the buffer tank (1) through the electric valve 13 (94); the nitrogen inlet end of the resin adsorption tower 1 (5) is connected to the nitrogen inlet end of the buffer tank (1) through the electric valve 18 (79); the nitrogen inlet end of the resin adsorption tower 2 (6) is connected to the nitrogen inlet end of the buffer tank (1) through the electric valve 19 (80); The organic waste gas outlet of the condensation and defrosting tank 1 (3) is connected to the waste gas inlet of the one-way valve 2 (96) through the electric valve 15 (81), and the organic waste gas outlet of the condensation and defrosting tank 2 (4) is connected to the waste gas inlet of the one-way valve 2 (96) through the electric valve 14 (95); the waste gas outlet of the one-way valve 2 (96) is connected to the waste gas inlet of the resin adsorption tower 1 (5) through the electric valve 16 (97); the waste gas outlet of the one-way valve 2 (96) is connected to the waste gas inlet of the resin adsorption tower 2 (6) through the electric valve 17 (78); The purified waste gas outlet of the resin adsorption tower 1 (5) is connected to the electric valve 20 (98); the purified waste gas outlet of the resin adsorption tower 2 (6) is connected to the electric valve 21 (99); the purified waste gas inlet of the power fan 1 (7) is connected to the electric valve 23 (101), and the purified waste gas outlet of the power fan 1 (7) is connected to the electric valve 24 (102); the purified waste gas outlet of the power fan 2 (8) is connected to the electric valve 22 (100); the purified waste gas outlet of the power fan 2 (8) is connected to the electric valve 25 (103); The waste liquid collection outlet of the buffer tank (1) is connected to the waste liquid collection inlet of the diaphragm pump (16) through the electric ball valve 26 (104) and the ball valve 5 (105) in sequence; the overflow liquid outlet of the washing tower (2) is connected to the waste liquid collection inlet of the diaphragm pump (16) through the electric ball valve 27 (106) and the ball valve 6 (107) in sequence; the waste liquid collection outlet of the resin adsorption tower (5) is connected to the waste liquid collection inlet of the diaphragm pump (16) through the electric ball valve 28 (108) and the ball valve 7 (109) in sequence; the waste liquid collection outlet of the resin adsorption tower (6) is connected to the waste liquid collection inlet of the diaphragm pump (16) through the electric ball valve 29 (110) and the ball valve 8 (111) in sequence; the high-concentration waste liquid discharge end of the washing tower (2) is connected to the waste liquid collection inlet of the diaphragm pump (16) through the electric ball valve 27 (106) and the ball valve 6 (107) in sequence. The movable ball valve thirty (112) and the ball valve nine (113) are connected to the high-concentration waste liquid inlet of the diaphragm pump two (17); the circulating water supply inlet of the washing tower (2) is connected to the water supply outlet of the diaphragm pump three (18) through the electric ball valve thirty-one (114); a manual valve six (115) is provided on the pipeline between the waste gas collection inlet of the buffer tank (1) and the liquid storage tank (15); the defrost waste liquid outlet of the condensation defrost tank one (3) is connected to the waste liquid collection inlet of the diaphragm pump one (16) through the electric ball valve thirty-two (117); the defrost waste liquid outlet of the condensation defrost tank two (4) is connected to the waste liquid collection inlet of the diaphragm pump one (16) through the electric ball valve thirty-three (118); the high-concentration waste liquid outlet of the magnetic pump (19) is connected to the distillation tower through the ball valve ten (116).

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