CN116078098A - VOCs waste gas treatment method - Google Patents

Abstract

A VOCs waste gas treatment method belongs to the technical field of VOCs waste gas treatment. The method is characterized in that: the heat pump unit comprises a compressor (1), a condenser (5), a refrigerant storage tank (7) and evaporators, wherein the evaporators are arranged in each recovery cavity (18), the refrigerant outlets of the compressor (1) are simultaneously connected with the refrigerant inlets of the two evaporators and the refrigerant inlet of the condenser (5), the refrigerant inlet of the refrigerant storage tank (7) is communicated with the refrigerant outlet of the condenser (5), the refrigerant outlet of the refrigerant storage tank (7) is simultaneously communicated with the refrigerant inlets of the two evaporators, and the refrigerant outlets of the two evaporators are simultaneously communicated with the refrigerant inlet of the compressor (1) and the refrigerant inlet of the refrigerant storage tank (7). The invention realizes the continuous condensation treatment of VOCs waste gas, can eliminate the problem that the evaporator frosts to influence the condensation effect, and fundamentally eliminates the problem of the evaporator frosting.

Description

VOCs waste gas treatment method

Technical Field

A VOCs waste gas treatment method belongs to the technical field of VOCs waste gas treatment.

Background

VOCs waste gas is a command organic matter, and according to WHO (world health organization) definition, volatile Organic Compounds (VOC) refer to various organic compounds with boiling points of 50-260 ℃ under normal pressure. VOCs can be further divided into, by their chemical structure: alkanes, aromatic hydrocarbons, esters, aldehydes, and others, 300 or more have been identified. VOCs are involved in the formation of ozone and secondary aerosols in the atmospheric environment, which have an important impact on regional atmospheric ozone pollution, PM2.5 pollution. Most VOCs have unpleasant and characteristic odors, and are toxic, irritating, teratogenic and carcinogenic, especially benzene, toluene and formaldehyde, which can cause serious harm to human health. VOCs are important precursors for causing city dust haze and photochemical smog, and are mainly derived from the processes of coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and use and the like.

In the treatment of VOCs waste gas, petrochemical enterprises have high waste gas emission concentration, and waste gas purification treatment is carried out by adopting methods such as condensation, absorption, combustion and the like. For the waste gas containing high-concentration VOCs, the condensation recovery and adsorption recovery technology is preferably adopted for recycling, and other treatment technologies are assisted to realize standard emission.

At present, the condensation recovery of VOCs waste gas is mainly carried out by a heat pump unit, and the waste gas is subjected to deep cooling by an evaporator of the heat pump unit, so that the VOCs in the waste gas are liquefied, and the recovery of the VOCs is realized. But heat pump set is in the in-process of work, in order to guarantee that VOCs liquefaction is effectual, and the temperature of evaporimeter is very low, and this just leads to very easy frosting on the evaporimeter, and frosting can influence the cooling effect of evaporimeter, and then influences the efficiency to the condensation recovery of VOCs. After the evaporator is required to work for a period of time, defrosting is required, equipment is required to be stopped during defrosting, the evaporator of the heat pump unit is used as a condenser, and the condenser of the heat pump unit is used as an evaporator to heat up and defrost the evaporator, so that on one hand, waste gas treatment interruption can be caused, the continuity of waste gas treatment is affected, and on the other hand, the liquefied VOCs are vaporized again due to heating of the evaporator, and the condensation recovery efficiency of the VOCs is affected.

Disclosure of Invention

The invention aims to solve the technical problems that: overcomes the defects of the prior art, and provides a VOCs waste gas treatment method which can realize continuous treatment of the VOCs waste gas and has high VOCs condensation recovery rate.

The technical scheme adopted for solving the technical problems is as follows: the VOCs waste gas treatment method is characterized by comprising the following steps of: the waste gas treatment equipment comprises a recovery tank and a heat pump unit, wherein two recovery cavities are arranged in the recovery tank, the heat pump unit comprises a compressor, a condenser, a refrigerant storage tank and evaporators, the evaporators are arranged in the recovery cavities, a refrigerant outlet of the compressor is simultaneously connected with a refrigerant inlet of the two evaporators and a refrigerant inlet of the condenser, a refrigerant inlet of the refrigerant storage tank is communicated with a refrigerant outlet of the condenser, a refrigerant outlet of the refrigerant storage tank is simultaneously communicated with refrigerant inlets of the two evaporators, refrigerant outlets of the two evaporators are simultaneously communicated with a refrigerant inlet of the compressor and a refrigerant inlet of the refrigerant storage tank, electromagnetic valves are arranged between the refrigerant inlet of each evaporator and the refrigerant outlet of the compressor and between the refrigerant outlet of the refrigerant storage tank, and electromagnetic valves are also arranged between the refrigerant outlet of each evaporator and the refrigerant inlet of the refrigerant storage tank;

the treatment process comprises the following steps:

the two evaporators alternately finish condensation and defrosting;

VOCs waste gas passes through by two recovery intracavity in turn, and when the evaporimeter carries out condensation work, VOCs waste gas passes through by the recovery chamber that this evaporimeter corresponds.

In the currently adopted defrosting method, an evaporator is usually used as a condenser, the condenser is used as an evaporator, defrosting of the evaporator is achieved, the condenser used as the evaporator absorbs heat during defrosting, and meanwhile the evaporator used as the condenser releases heat, so that the condenser is in a frequent heat absorption and release process, and the utilization rate of the heat released by the condenser is low. The condenser of the invention continuously works and releases heat, and only the refrigerant output by the compressor is directly introduced into the evaporator to be defrosted, so that the heat release of the condenser is not influenced, and the heat released by the condenser can be fully utilized.

Preferably, the condensation temperature of the evaporator on the VOCs waste gas is-20 ℃ to-70 ℃. The VOCs waste gas is treated to the temperature of minus 20 ℃ to minus 70 ℃, and the harmful substances in the gas can be basically absorbed to more than 95 percent.

Preferably, the exhaust gas discharged from the recovery chamber is adsorbed by a physical adsorption method. VOCs in the treated waste gas are adsorbed again by a physical adsorption method, so that the waste gas is prevented from directly discharging and polluting the environment, and the commonly selected adsorbents are activated carbon, silica gel, molecular sieve and the like.

Preferably, the compressor comprises two compression cylinders, two pistons and a driving device, wherein the two compression cylinders are respectively arranged on two sides of the driving device, the pistons are slidably arranged in the compression cylinders, the driving device is connected with the two pistons at the same time, and each compression cylinder is provided with an air inlet one-way valve and an air outlet one-way valve. The driving device drives the two pistons to synchronously move, so that the working efficiency of the compressor is improved, and the two compression cylinders are opposite to each other, so that the compressor can be ensured to work more stably.

Preferably, the driving device comprises a driving motor and an eccentric wheel transmission mechanism, and an output shaft of the driving motor is simultaneously connected with the two pistons through the eccentric wheel transmission mechanism. The driving motor drives the piston to move through the eccentric wheel driving mechanism, compared with the driving of the piston by adopting the crankshaft connecting rod mechanism, the driving motor has no mechanical dead point, and the eccentric wheel is easier to process compared with a crankshaft.

Preferably, the eccentric wheel transmission mechanism comprises a rotary table, a driving plate and a pin shaft, wherein two sides of the driving plate are fixedly connected with the pistons at the corresponding sides through connecting rods respectively, a driving long hole is formed in the driving plate, the driving long hole is perpendicular to the movement direction of the pistons, the rotary table is arranged on an output shaft of the driving motor, the pin shaft is arranged on the rotary table, the pin shaft and the rotary table are eccentrically arranged, and the pin shaft can slidably extend into the driving long hole. The driving motor drives the turntable to rotate, and then the driving plate reciprocates in the driving long hole through the pin shaft, and then the driving plate reciprocates, and the driving plate drives two pistons to synchronously move through two connecting rods, the connecting rods are directly fixedly connected with the pistons, lubrication is not needed between the connecting rods and the pistons, and the fixed connection is convenient to connect and long in service life compared with the hinge connection.

Preferably, the piston on be provided with the installation blind hole, the diameter of the inner of installation blind hole is greater than the diameter of outer end to form locking portion at the inner of installation blind hole, be provided with the bayonet lock on the eccentric wheel drive mechanism, the relative both sides of installation blind hole are provided with the groove of stepping down that supplies the bayonet lock to enter into in the locking portion. The bayonet lock of eccentric wheel drive mechanism enters into locking portion through stepping down the groove, then rotates relatively between eccentric wheel drive mechanism and the piston, can make bayonet lock and stepping down the groove and stagger in the circumferencial direction of piston, and then realized the butt joint of eccentric wheel drive mechanism and piston, convenient connection.

Preferably, the top of recovery jar be provided with the reversing device, the waste gas entry of recovery jar is through reversing device and two recovery chambeies intercommunication in turn, the bottom of recovery jar is provided with the recovery mouth, the lateral part of recovery jar is provided with the waste gas export, the waste gas export sets up the downside at the evaporimeter. The reversing device can enable VOCs waste gas to alternately flow to the two recovery cavities, and automatic and replacement of waste gas is achieved.

Preferably, the reversing device comprises a reversing cylinder, sealing plugs and a power device, wherein the upper part of the reversing cylinder is communicated with the waste gas inlet, the lower part of the reversing cylinder is closed, the closed end of the reversing cylinder is provided with input channels, the input channels are in one-to-one correspondence with the recovery cavities, the lower ends of the input channels are communicated with the corresponding recovery cavities, the diameter of the input channels is gradually reduced from top to bottom, the sealing plugs are arranged in the input channels, and the power device is connected with the two sealing plugs and drives the two sealing plugs to synchronously move in opposite directions. The power device drives the two sealing plugs to synchronously move in opposite directions, when one sealing plug seals the input channel, the other sealing plug opens the input channel, so that the reversing of VOCs waste gas is facilitated, the two sealing plugs realize linkage, and the reversing of the VOCs waste gas is ensured to be more stable and reliable.

Preferably, the power device comprises a reversing motor, a driving shaft and a driving arm, wherein the driving shaft is horizontally arranged on the reversing cylinder, two sides of the driving shaft are respectively connected with sealing plugs at corresponding sides through the driving arm, and an output shaft of the driving motor is connected with the driving shaft through a worm gear mechanism. The reversing motor drives the driving arm to move through the worm and gear mechanism, so that the two sealing plugs are driven to move in opposite directions synchronously, the driving is convenient, the worm and gear mechanism has the characteristic of reverse self-locking, the problem that the air pressure in the reversing cylinder drives the sealing plugs to move can be solved, and the movement of the sealing plugs is ensured to be more reliable.

Preferably, an elastic pre-tightening device is arranged between the sealing plug and the power device. The power device drives the sealing plug to compress the input channel through the elastic pre-tightening device, and due to the existence of the elastic pre-tightening device, the sealing plug can be ensured to seal the corresponding input channel reliably, and rigid collision between the sealing plug and the inner wall of the input channel can be avoided, so that equipment is damaged.

Preferably, the elastic pre-tightening device comprises a mounting cylinder and a pre-tightening spring, a mounting blind hole is formed in the top of the sealing plug, the upper end of the mounting cylinder is rotatably connected with the power device, the rotating shaft is horizontal, the lower end of the mounting cylinder extends into the sealing plug and is slidably connected with the sealing plug, and the pre-tightening spring is arranged between the mounting cylinder and the sealing plug. The pre-tightening spring pushes the sealing plug to press the inner wall of the input channel, so that the sealing reliability between the sealing plug and the input channel is ensured.

Compared with the prior art, the invention has the following beneficial effects:

according to the VOCs waste gas treatment method, defrosting and condensing work is alternately completed by the two evaporators, condensing and recycling work is alternately completed in the two recycling cavities, so that continuous condensing treatment of VOCs waste gas is realized, the problem that condensing effect is affected due to frosting of the evaporators can be solved, and the problem of frosting of the evaporators is fundamentally solved; when the two evaporators work, one evaporator is used as a condenser, and the evaporator to be defrosted can be used as the condenser only by leading out the refrigerant output by the compressor to the evaporator to be defrosted and enabling the refrigerant passing through the evaporator to flow back to the refrigerant storage tank, so that no influence is generated on the work of the whole heat pump unit.

Drawings

Fig. 1 is a schematic diagram of a heat pump unit.

Fig. 2 is a schematic front cross-sectional view of the recovery tank.

Fig. 3 is a partial enlarged view at a in fig. 2.

Fig. 4 is a schematic top cross-sectional view of the reversing cylinder.

Fig. 5 is a schematic cross-sectional front view of a coupling.

Fig. 6 is a schematic front sectional view of a compressor.

Fig. 7 is a partial method diagram at B in fig. 6.

Fig. 8 is a schematic front cross-sectional view of the piston.

Fig. 9 is a partial enlarged view at C in fig. 8.

Fig. 10 is a schematic bottom view of the piston.

In the figure: 1. compressor 2, oil separator 3, oil filter 4, oil cooler 5, condenser 6, first refrigerant filter 7, refrigerant reservoir 8, delivery pump 9, second refrigerant filter 10, expansion valve 11, first evaporator 12, second evaporator 13, refrigerant return pipe 14, refrigerant delivery pipe 15, defrosting pipe 16, recovery tank 17, partition 18, recovery chamber 19, recovery baffle 20, exhaust gas outlet 21, recovery port 22, exhaust gas inlet 23, reversing cylinder 2301, input passage 24, sealing plug 25, driving arm 26, hanging plate 27, driving shaft 28, sealing layer 2801, reversing seal 29, mounting cylinder 30, reversing adjustment screw 31, pretensioning spring 32, worm 33, worm wheel 34, first connecting disk 35, first butt 36, second butt 37, elastic connection 3701 elastic connection portion 38, positioning portion 39, driving cylinder 40, piston 4001, mounting blind hole 4002, locking portion 4003, relief groove 41, compression cylinder 42, rotary disk 43, driving plate 4301, driving long hole 44, pin 45, connecting rod 46, end cap 4601, intake hole 4602, inside flange 4603, intake seal portion 4604, exhaust hole 4605, exhaust seal portion 47, cooling cylinder 48, spiral damper 49, exhaust check valve 4901, exhaust flap seal portion 4902, exhaust flap over-flow portion 4903, exhaust groove 4904, exhaust valve spring 4905, exhaust valve adjustment screw 50, intake check valve 5001, intake groove 5002, intake flap seal portion 5003, intake flap over-flow portion 5004, intake valve spring 51, compression rod 52, exhaust adjustment nut 53, O-ring 54, compression ring 55, flexible ring.

Detailed Description

The present invention will be further described with reference to specific embodiments, however, it will be appreciated by those skilled in the art that the detailed description herein with reference to the accompanying drawings is for better illustration, and that the invention is not necessarily limited to such embodiments, but rather is intended to cover various equivalent alternatives or modifications, as may be readily apparent to those skilled in the art.

Fig. 1 to 10 are diagrams illustrating preferred embodiments of the present invention, and the present invention is further described below with reference to fig. 1 to 10.

The waste gas treatment method comprises a recovery tank 16 and a heat pump unit, wherein two recovery cavities 18 are arranged in the recovery tank 16, the heat pump unit comprises a compressor 1, a condenser 5, a refrigerant storage tank 7 and evaporators, the evaporators are arranged in the recovery cavities 18, a refrigerant outlet of the compressor 1 is simultaneously connected with refrigerant inlets of the two evaporators and a refrigerant inlet of the condenser 5, a refrigerant inlet of the refrigerant storage tank 7 is communicated with a refrigerant outlet of the condenser 5, a refrigerant outlet of the refrigerant storage tank 7 is simultaneously communicated with refrigerant inlets of the two evaporators, refrigerant outlets of the two evaporators are simultaneously communicated with a refrigerant inlet of the compressor 1 and a refrigerant inlet of the refrigerant storage tank 7, electromagnetic valves are arranged between the refrigerant inlets of the evaporators and the refrigerant outlet of the compressor 1 and between the refrigerant outlets of the refrigerant storage tank 7, and electromagnetic valves are also arranged between the refrigerant outlets of the evaporators and the refrigerant inlets of the refrigerant storage tank 7.

Specific: as shown in fig. 1: the refrigerant outlet of the compressor 1 is connected in series with the refrigerant inlet of the condenser 5 after being connected with the oil separator 2, the refrigerant outlet of the oil separator 2 is connected with the refrigerant inlet of the condenser 5, and the lubricating oil outlet of the oil separator 2 is connected in series with the oil filter 3 and the oil cooler 4 in sequence and then is connected with the lubricating oil inlet of the compressor 1. The oil separator 2 can separate the lubricating oil discharged along with the refrigerant from the refrigerant, and the separated lubricating oil is sequentially filtered by the oil filter 3 and cooled by the oil cooler 4 and then is sent back to the compressor 1, so that the damage of the compressor 1 due to the lack of the lubricating oil is avoided.

The refrigerant outlet of the condenser 5 is connected in series with the first refrigerant filter 6 and then is communicated with the refrigerant inlet of the refrigerant storage tank 7, and the refrigerant outlet of the refrigerant storage tank 7 is sequentially connected in series with the delivery pump 8, the second refrigerant filter 9 and the expansion valve 10 and then is simultaneously communicated with the refrigerant inlet of the first evaporator 11 and the refrigerant inlet of the second evaporator 12. The refrigerant outlet of the first evaporator 11 and the refrigerant outlet of the second evaporator 12 are simultaneously communicated with the refrigerant inlet of the compressor 1 through a refrigerant conveying pipe 14, and electromagnetic valves are connected between the refrigerant outlet of the first evaporator 11 and the refrigerant conveying pipe 14 and between the refrigerant outlet of the second evaporator 12 and the refrigerant conveying pipe 14. Solenoid valves are provided between the refrigerant outlet of the expansion valve 10 and the refrigerant inlet of the first evaporator 11 and between the refrigerant outlet of the expansion valve 10 and the refrigerant inlet of the second evaporator 12. Since the delivery pump 8 is used to realize the delivery of the refrigerant, the flow rate of the refrigerant can be precisely controlled by the delivery pump 8, and the expansion valve 10 can be omitted.

The refrigerant outlet of the oil separator 2 is also connected with the refrigerant inlet of the first evaporator 11 and the refrigerant inlet of the second evaporator 12 through a defrosting pipe 15, and electromagnetic valves are arranged between the defrosting pipe 15 and the refrigerant inlet of the first evaporator 11 and between the defrosting pipe 15 and the refrigerant inlet of the second evaporator 12. The refrigerant outlet of the first evaporator 11 and the refrigerant outlet of the second evaporator 12 are both communicated with the refrigerant inlet of the first refrigerant filter 6 through a refrigerant return pipe 13, electromagnetic valves are arranged between the refrigerant outlet of the first evaporator 11 and the refrigerant return pipe 13 and between the refrigerant outlet of the second evaporator 12 and the refrigerant return pipe 13, and a check valve is arranged between the refrigerant return pipe 13 and the refrigerant inlet of the first refrigerant filter 6.

When the heat pump unit works, the delivery pump 8 delivers the refrigerant into the first evaporator 11 or the second evaporator 12, so as to condense and liquefy VOCs in the VOCs waste gas, the refrigerant sent out by the first evaporator 11 or the second evaporator 12 enters the compressor 1 for compression, and the compressed refrigerant is separated by the oil separator 2, and enters the refrigerant storage tank 7 again after heat dissipation of the condenser 5.

When defrosting is required, the refrigerant separated by the oil separator 2 is sent into the first evaporator 11 or the second evaporator 12, and after the refrigerant radiates heat through the first evaporator 11 or the second evaporator 12, the refrigerant flows back into the refrigerant storage tank 7, so that defrosting action of the first evaporator 11 or the second evaporator 12 is realized.

As shown in fig. 2 to 3: the recovery tank 16 is a square cylinder arranged vertically, a partition plate 17 is arranged in the recovery tank 16, the partition plate 17 is arranged vertically in the middle of the recovery tank 16, the inner cavity of the recovery tank 16 is divided into two recovery cavities 18 arranged side by side, and the first evaporator 11 and the second evaporator 12 are respectively arranged in the two recovery cavities 18. The top of the recovery tank 16 is provided with a reversing device, and the exhaust gas inlet 22 of the recovery tank 16 is provided on the upper side of the reversing device and communicates with the reversing device and alternately communicates with the two recovery chambers 18 through the reversing device. The bottom of recovery jar 16 is provided with recovery mouth 21, and the both sides of recovery jar 16 all are provided with waste gas export 20, and two waste gas exports 20 communicate with two recovery chamber 18 respectively, can guarantee that two recovery chamber 18 exhaust smoothly, and waste gas export 20 sets up the downside at first evaporimeter 11 and second evaporimeter 12.

The bottom of each recovery chamber 18 is provided with a recovery baffle 19, and the recovery baffle 19 is provided with a plurality of pieces from top to bottom at intervals, and in this embodiment, the recovery baffle 19 is provided with three pieces from top to bottom at intervals, and three recovery baffles 19 form a rotary channel at the bottom of the recovery chamber 18. The exhaust gas outlet 20 is located between the two recovery baffles 19 at the lowest side, so that smooth exhaust of exhaust gas can be ensured, and liquid VOCs after condensation can be prevented from being exhausted by the exhaust gas outlet 20.

Each recovery baffle 19 all one side and the interval of retrieving chamber 18 inner wall set up, form the free end, and each recovery baffle 19 is along the direction that is close to the free end decurrent slope form gradually, can enough carry out the water conservancy diversion to liquid VOCs, further avoids liquid VOCs to flow by waste gas export 20, can also produce the blocking effect to the gas in another recovery chamber 18 when retrieving chamber 18 defrosting, avoids its recovery intracavity that flows into the defrosting.

The reversing device comprises a reversing cylinder 23, a sealing plug 24 and a power device, wherein the reversing cylinder 23 is in sealing connection with the recovery tank 16, the reversing cylinder 23 is a square cylinder with a closed bottom, two input channels 2301 are arranged at the closed end of the reversing cylinder 23, the diameter of each input channel 2301 is gradually reduced from top to bottom to form an inverted truncated cone shape, the input channels 2301 are in one-to-one correspondence with the recovery cavities 18, and the bottoms of the input channels 2301 are communicated with the corresponding recovery cavities 18. The upper side of each input channel 2301 is correspondingly provided with a sealing plug 24, a power device is arranged between the two sealing plugs 24, the power device is connected with the two sealing plugs 24 at the same time and drives the two sealing plugs 24 to move synchronously in opposite directions, and when one sealing plug 24 seals the corresponding input channel 2301, the other sealing plug 24 opens the corresponding input channel 2301.

The sealing layer 28 is detachably arranged at the bottom of each sealing plug 24, the sealing layer 28 is made of polytetrafluoroethylene, a rounding angle is formed around the bottom of the sealing layer 28, a reversing sealing part 2801 is formed at the bottom of the sealing layer 28, the bottom of the reversing sealing part 2801 is tightly pressed against the inner wall of the corresponding input channel 2301, so that the sealing of the reversing sealing part 2801 to the input channel 2301 is realized, and the sealing of the input channel 2301 is ensured to be more reliable due to the fact that the reversing sealing part 2801 is in line contact with the inner wall of the input channel 2301, and the reversing sealing part 2801 made of polytetrafluoroethylene has good wear resistance and long service life.

The power device comprises a reversing motor, a driving shaft 27 and a driving arm 25, wherein the driving shaft 27 is rotatably arranged on the reversing cylinder 23, and the driving shaft 27 is horizontally arranged between two input channels 2301. The reversing motor is arranged on the outer side of the reversing cylinder 23, and an output shaft of the reversing motor is connected with the driving shaft 27 through a worm gear mechanism and drives the reversing motor to rotate. The driving shaft 27 is arranged between the two sealing plugs 24, both sides of the driving shaft 27 are connected with the sealing plugs 24 on the corresponding sides through the driving arms 25, and the driving motor drives the driving shaft 27 to rotate so as to drive the sealing plugs 24 on both sides to synchronously move towards opposite directions.

Elastic pre-tightening devices are arranged between each sealing plug 24 and the corresponding driving arm 25, each elastic pre-tightening device comprises a mounting cylinder 29 and a pre-tightening spring 31, mounting blind holes are coaxially formed in the top of each sealing plug 24, each mounting cylinder 29 is a cylinder with a closed top end, hanging plates 26 are mounted on the upper portion of each mounting cylinder 29, two hanging plates 26 are arranged at intervals, and the end portions of the driving arms 25 extend into the space between the two hanging plates 26 on the corresponding sides and are hinged to the two hanging plates 26. The lower extreme slidable of installation section of thick bamboo 29 stretches into the installation blind hole, connect through switching-over adjusting screw 30 between installation section of thick bamboo 29 and the sealing plug 24, switching-over adjusting screw 30 is located between two hitch plates 26, and be located the downside of actuating arm 25, the lower extreme slidable of switching-over adjusting screw 30 stretches into the installation blind hole after passing the blind end of installation section of thick bamboo 29, and with the sealing plug 24 threaded connection of installation blind hole bottom, the upper end threaded connection of switching-over adjusting screw 30 has switching-over adjusting nut, switching-over adjusting nut sets up the upside at installation section of thick bamboo 29, and carry out spacingly to installation section of thick bamboo 29, avoid installation section of thick bamboo 29 and sealing plug 24 separation, pretension spring 31 sets up in installation section of thick bamboo 29, pretension spring 31 is in compression state, pretension spring 31's upper end supports at installation section of thick bamboo 29 inner wall, the lower extreme supports in the bottom of installation blind hole, thereby play the pretension's effect, can also avoid producing the rigid load. The mounting cylinder 29 is hinged with the driving arm 25 through the hanging plate 26, so that the sealing plug 24 can be ensured to be vertical all the time under the action of gravity, and the sealing of the input channel 2301 is facilitated.

As shown in fig. 4: the reversing motor is installed on one side of the reversing cylinder 23, and both ends of the driving shaft 27 are rotatably installed on the reversing cylinder 23 through bearing blocks and bearings. The worm gear mechanism comprises a worm wheel 33 and a worm 32, the worm wheel 33 is coaxially connected with the driving shaft 27, the worm 32 is connected with an output shaft of a reversing motor through a coupler, the worm wheel 33 is meshed with the worm 32, and the reversing motor drives the driving shaft 27 to rotate through the worm 32 and the worm wheel 33.

As shown in fig. 5: the shaft coupling includes first connection pad 34, second connection pad and elastic connection piece 37, and the one end and the coaxial and fixed connection of worm 32 of first connection pad 34, the other end are provided with first pair of connecting blocks 35, and first pair of connecting blocks 35 is the fan-shaped coaxial with first connection pad 34, and first pair of connecting blocks 35 encircle first connection pad 34 interval equipartition and have four. One end of the second connecting disc is coaxial with the output shaft of the reversing motor and is fixedly connected with the output shaft of the reversing motor, the other end of the second connecting disc is provided with a second butt joint block 36, the second butt joint block 36 is in a sector coaxial with the second connecting disc, and four second butt joint blocks 36 are uniformly distributed around the second connecting disc at intervals.

The first connecting disc 34 and the second connecting disc are coaxially arranged, and the first pair of connecting blocks 35 and the second pair of connecting blocks 36 are positioned between the first connecting disc 34 and the second connecting disc, wherein the second pair of connecting blocks 36 are arranged between every two adjacent first pair of connecting blocks 35. The elastic connecting piece 37 is located between the first connecting disc 34 and the second connecting disc, a plurality of convex elastic connecting parts 3701 are arranged on the outer side of the elastic connecting piece 37, and elastic connecting parts 3701 are arranged between each first butt joint block 35 and the second butt joint blocks 36 adjacent to the two sides of the first butt joint block. The worm 32 is rotatably installed on the reversing cylinder 23, and the reversing motor is installed on the reversing cylinder 23, so that the first connecting disc 34 and the second connecting disc are pressed tightly. The elastic connecting piece 37 is made of polytetrafluoroethylene or rubber, and can allow the first connecting disc 34 and the second connecting disc to rotate relatively at a certain angle, so that the effect of secondary elastic pre-tightening is achieved.

Both sides of the first butt joint block 35 and the second butt joint block 36 are provided with concave arc-shaped positioning parts 38, and both sides of the elastic connecting part 3701 are provided with butt joint parts matched with the positioning parts 38, so that the butt joint among the elastic connecting piece 37, the first butt joint block 35 and the second butt joint block 36 is reliable.

As shown in fig. 6: the compressor 1 comprises a compression cylinder 41, a piston 40, a driving device and a driving cylinder 39, wherein both ends of the driving cylinder 39 are all open, both sides of the driving cylinder 39 are both provided with the compression cylinder 41, one end of the compression cylinder 41 is detachably connected with one end corresponding to the driving cylinder 39, the other end is closed through end covers 46, and each end cover 46 is provided with an air inlet one-way valve 50 and an air outlet one-way valve 49. The piston 40 is slidably installed in each compression cylinder 41, the piston 40 is in sealing arrangement with the inner wall of the compression cylinder 41, and the driving device is simultaneously connected with the two pistons 40 and drives the two pistons 40 to synchronously move.

The cooling cylinder 47 is sleeved outside each compression cylinder 41, the compression cylinders 41 and the cooling cylinder 47 are arranged at intervals, a cooling cavity is formed between the compression cylinders 41 and the cooling cylinder 47, the temperature of the compression cylinders 41 can be adjusted through the cooling cylinder 47, and the excessive temperature of the compression cylinders 41 is avoided.

The spiral baffle plate 48 is arranged in the cooling cavity, the spiral baffle plate 48 separates the cooling cavity into spiral cooling channels which are arranged around the compression cylinder 41, the cooling of the compression cylinder 41 can be realized through the cooling channels, and the cooling medium can flow through the outer wall of the whole compression cylinder 41 to uniformly cool the compression cylinder 41.

The driving device comprises a driving motor and an eccentric wheel transmission mechanism, the driving motor is arranged on one side of the driving cylinder 39, the eccentric wheel transmission mechanism is arranged in the driving cylinder 39, an output shaft of the driving motor extends into the driving cylinder 39 and is connected with the eccentric wheel transmission mechanism, and the eccentric wheel transmission mechanism is fixedly connected with pistons 40 on two sides and drives the pistons 40 on two sides to synchronously move.

The eccentric wheel transmission mechanism comprises a rotary table 42, a driving plate 43 and a pin shaft 44, wherein the rotary table 42 is coaxially arranged on an output shaft of the driving motor and synchronously rotates along with the output shaft of the driving motor, the driving plate 43 is movably arranged in the driving cylinder 39, two ends of the driving plate 43 are respectively provided with a connecting rod 45, one end of the connecting rod 45 is fixedly connected with the driving plate 43, the other end of the connecting rod 45 is fixedly connected with a piston 40 at the corresponding side, and the connecting rods 45 are arranged along the movement direction of the piston 40. The axis of the turntable 42 is arranged perpendicular to the direction of movement of the piston 40. The driving plate 43 is provided at a central portion thereof with a driving long hole 4301, the driving long hole 4301 being disposed in a direction perpendicular to a movement direction of the piston 40. The end face of the turntable 42 is provided with a pin 44, the pin 44 is arranged along the axis of the turntable 42, the pin 44 is eccentrically arranged with the turntable 42, and the pin 44 is slidably arranged in the driving slot 4301. A roller may be mounted on the pin 44 and rotatably disposed within the driving slot 4301 to reduce friction between the pin 44 and the driving plate 43. The driving motor drives the turntable 42 to rotate, the turntable 42 drives the pin shaft 44 to synchronously rotate, the pin shaft 44 slides in the driving long hole 4301, the driving plate 43 is driven to reciprocate, and the two pistons 40 are driven to synchronously move through the connecting rod 45, so that the refrigerant is compressed.

As shown in fig. 7: an air inlet hole 4601 is provided on the end cover 46, an inner flange 4602 is provided around the inner end of the air inlet hole 4601, and an air inlet seal portion 4603 having a gradually increasing diameter from outside to inside is provided at the outer end of the air inlet hole 4601.

The air inlet check valve 50 is arranged in the air inlet hole 4601, the air inlet check valve 50 comprises an air inlet valve clack and an air inlet valve spring 5004, and the air inlet valve clack and the air inlet valve spring 5004 are sequentially arranged in the air inlet hole 4601 from outside to inside. The air inlet valve spring 5004 is in a compressed state, one end of the air inlet valve spring 5004 is supported on the inner flange 4602, the other end of the air inlet valve spring 5004 is supported on the air inlet valve flap, and the air inlet valve flap is pushed to press the air inlet sealing part 4603, so that the air inlet hole 4601 is sealed, when the air pressure outside the end cover 46 is larger than the air pressure inside the end cover 46, and the elastic force of the air inlet valve spring 5004 is overcome, the air inlet valve flap is pushed to move inwards by the pressure outside the end cover 46, and then the air inlet hole 4601 is opened, so that air inlet is realized. When the intake is completed, the intake valve spring 5004 urges the intake valve flap to press against the intake seal portion 4603 and again closes the intake hole 4601. The refrigerant introduced into the compressor 1 is a low-pressure gaseous refrigerant, and is compressed by the compressor 1 to become a high-pressure refrigerant. The in-turned edge 4602 may be threadably coupled to the end cap 46 to facilitate installation of the intake valve spring 5004.

The diameter of one end of the air inlet valve clack, which is close to the air inlet sealing part 4603, is smaller than that of the other end, an air inlet valve clack sealing part 5002 is formed at one end of the air inlet valve clack, which is close to the air inlet sealing part 4603, an air inlet valve clack overflow part 5003 is formed at the other end of the air inlet valve clack, a plurality of air inlet grooves 5001 are formed around the outer wall of the air inlet valve clack overflow part 5003 at intervals, the air inlet valve clack overflow part 5003 can be matched with the air inlet hole 4601 to guide the air inlet valve clack, and air can enter the compression cylinder 41 after passing through the air inlet valve clack overflow part 5003.

The end cap 46 is further provided with an exhaust hole 4604, and an inner end of the exhaust hole 4604 is provided with an exhaust sealing portion 4605 having a gradually decreasing diameter from outside to inside. The exhaust check valve 49 is installed in the exhaust hole 4604.

The exhaust check valve 49 includes an exhaust valve flap and an exhaust valve spring 4904, where the exhaust valve flap and the exhaust valve spring 4904 are sequentially disposed from inside to outside, the exhaust valve spring 4904 is in a compressed state, one end of the exhaust valve spring 4904 is supported on the end cover 46, the other end is connected to the exhaust valve flap, and the exhaust valve spring 4904 pushes the exhaust valve flap to press against the exhaust sealing portion 4605 to seal the exhaust hole 4604. When the compressed gas reaches a specified pressure and overcomes the exhaust valve spring 4904, the exhaust valve flap is pushed to move outwards and the exhaust hole 4604 is opened, so that the compressed gas is discharged, and after the compressed gas is discharged, the exhaust valve spring 4904 pushes the exhaust valve flap to compress the exhaust sealing part 4605 again and closes the exhaust hole 4604 again. The exhaust valve spring 4904 compresses the refrigerant to a predetermined pressure to discharge the refrigerant, and the pressure of the discharged refrigerant is sufficient.

The diameter of the exhaust valve clack near one end of the exhaust sealing part 4605 is smaller than that of the other end, an exhaust valve clack sealing part 4901 is formed at one end of the exhaust valve clack near the exhaust sealing part 4605, an exhaust valve clack overflowing part 4902 is formed at the other end of the exhaust valve clack, a plurality of exhaust grooves 4903 are formed around the exhaust valve clack overflowing part 4902 at intervals, the exhaust valve clack overflowing part 4902 can be matched with the exhaust hole 4604 to guide the exhaust valve clacks, and gas in the compression cylinder 41 can be discharged out of the compression cylinder 41 after passing through the exhaust valve clack overflowing part 4902.

The exhaust valve clack is connected with adjusting device, adjusting device includes exhaust valve adjusting screw 4905, depression bar 51 and exhaust adjusting nut 52, exhaust valve adjusting screw 4905 sets up in the outside of exhaust valve clack, exhaust valve adjusting screw 4905's one end and exhaust valve clack threaded connection, threaded connection has exhaust adjusting nut 52 behind the other end slidable pass depression bar 51, the both ends of depression bar 51 support on exhaust hole 4604 inner wall and with exhaust hole 4604 inner wall detachable connection, in this embodiment, the both ends of depression bar 51 all are provided with the screw thread, exhaust hole 4604's left end inner wall is provided with the screw thread, depression bar 51 and exhaust hole 4604 inner wall threaded connection. The outer end of the exhaust valve spring 4904 is supported on the compression rod 51, and the elastic force of the exhaust valve spring 4904 can be adjusted by adjusting the position of the compression rod 51 in the exhaust hole 4604, so that the pressure of the exhausted compressed gas can be adjusted.

As shown in fig. 8 to 10: end seal grooves are provided around the upper and lower outer walls of the piston 40, and O-rings 53 are installed in the end seal grooves, so that the piston 40 and the corresponding compression cylinder 41 can be sealed. The middle part that encircles piston 40 is provided with the middle part seal groove, be provided with clamp ring 54 and flexible ring 55 in the middle part seal groove, the both sides of clamp ring 54 all are provided with flexible ring 55, the diameter of clamp ring 54 equals or is greater than the diameter of piston 40 with the diameter of piston 40, the diameter of flexible ring 55 is greater than the diameter of clamp ring 54, at the in-process of piston 40 reciprocating motion, can play sealed effect between piston 40 and compression cylinder 41, can strike off the lubricating oil of compression cylinder 41 inner wall again, avoid lubricating oil to enter into compression cylinder 41's rodless chamber, and then discharge along with the refrigerant. Compression ring 54 is formed by two semicircular rings that are spliced together to facilitate installation of compression ring 54.

The one end that piston 40 is close to connecting rod 45 is provided with the installation blind hole 4001, and the diameter of the inner of installation blind hole 4001 is greater than the diameter of outer end to form locking portion 4002 at the inner of installation blind hole 4001, be provided with the groove 4003 of stepping down in the opposite both sides of installation blind hole 4001, the inner and the locking portion 4002 intercommunication of groove 4003 of stepping down are provided with the bayonet lock on connecting rod 45, and connecting rod 45 is all stretched out at the both ends of bayonet lock. When the connecting rod 45 is fixedly connected with the piston 40, the two clamping pins are respectively aligned with the two yielding grooves 4003, when the end part of the connecting rod 45 stretches into the mounting blind hole 4001 and the clamping pin is positioned in the locking part 4002, the piston 40 and the connecting rod 45 are enabled to rotate relatively, and at the moment, the clamping pin and the yielding grooves 4003 are staggered in the circumferential direction of the piston 40, so that the connection between the piston 40 and the connecting rod 45 is realized, and the connection through bolts is not needed.

Since the connecting rod 45 is fixedly connected with the driving plate 43, and the driving plate 43 is limited by the turntable 42, rotation in the axial direction of the piston 40 does not occur, the piston 40 is pressed against the compression cylinder 41 by the flexible ring 55 and the O-ring 53, and the connecting rod 45 and the piston 40 do not rotate at will, and therefore stable connection can be ensured between the connecting rod 45 and the piston 40.

A VOCs waste gas treatment method comprises the following steps: the first evaporator 11 and the second evaporator 12 alternately perform defrosting and condensing operations.

The flow direction of the refrigerant is regulated through the electromagnetic valve, so that part of the refrigerant discharged through the oil separator 2 enters the refrigerant storage tank 7 after passing through the condenser 5, is conveyed into one of the evaporators through the conveying pump 8, and flows back into the compressor 1 through the evaporator, and further condensation work is realized. The other part of refrigerant discharged by the oil separator 2 directly enters the other evaporator and flows into the refrigerant storage tank 7 through the evaporator, and the evaporator is used as a condenser to realize defrosting of the evaporator.

The VOCs waste gas passes through the two recovery cavities 18 alternately, and when the evaporator performs condensation operation, the VOCs waste gas passes through the corresponding recovery cavity 18 of the evaporator. The condensing temperature of the evaporator to VOCs is-20 ℃ to-70 ℃. The VOCs waste gas is treated to the temperature of minus 20 ℃ to minus 70 ℃, and the harmful substances in the gas can be basically absorbed to more than 95 percent. The exhaust gas discharged from the recovery chamber 18 is adsorbed by a physical adsorption method. VOCs in the treated waste gas are adsorbed again by a physical adsorption method, so that the waste gas is prevented from directly discharging and polluting the environment, and the commonly selected adsorbents are activated carbon, silica gel, molecular sieve and the like.

VOCs waste gas enters a recovery cavity 18 after passing through a reversing cylinder 23, and at the moment, an evaporator in the recovery cavity 18 performs condensation; the upper end of the other recovery chamber 18 is closed and the evaporator in the recovery chamber 18 performs defrosting operation.

The two evaporators work alternately, so that the continuous treatment of VOCs waste gas is realized, and the defect that the treatment of the VOCs waste gas needs to be stopped during defrosting is fundamentally overcome.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A VOCs waste gas treatment method is characterized in that: the waste gas treatment equipment comprises a recovery tank (16) and a heat pump unit, wherein two recovery cavities (18) are arranged in the recovery tank (16), the heat pump unit comprises a compressor (1), a condenser (5), a refrigerant storage tank (7) and evaporators, the evaporators are arranged in the recovery cavities (18), the refrigerant outlets of the compressor (1) are simultaneously connected with the refrigerant inlets of the two evaporators and the refrigerant inlet of the condenser (5), the refrigerant inlet of the refrigerant storage tank (7) is communicated with the refrigerant outlet of the condenser (5), the refrigerant outlets of the refrigerant storage tank (7) are simultaneously communicated with the refrigerant inlets of the two evaporators, the refrigerant outlets of the two evaporators are simultaneously communicated with the refrigerant inlet of the compressor (1) and the refrigerant inlet of the refrigerant storage tank (7), electromagnetic valves are arranged between the refrigerant inlets of the evaporators and the refrigerant outlet of the refrigerant storage tank (7), and electromagnetic valves are also arranged between the refrigerant outlets of the evaporators and the refrigerant inlets of the refrigerant storage tank (7);

the treatment process comprises the following steps:

the two evaporators alternately finish condensation and defrosting;

VOCs waste gas passes through in two recovery cavities (18) in turn, and when the evaporator carries out condensation work, VOCs waste gas passes through by the recovery cavity (18) that this evaporator corresponds.

2. The method for treating exhaust gas of VOCs according to claim 1, wherein: the condensation temperature of the evaporator on VOCs waste gas is-20 ℃ to-70 ℃.

3. The method for treating exhaust gas of VOCs according to claim 1, wherein: the exhaust gas discharged from the recovery chamber (18) is adsorbed by a physical adsorption method.

4. The method for treating exhaust gas of VOCs according to claim 1, wherein: the compressor (1) comprises two compression cylinders (41), two pistons (40) and a driving device, wherein the two compression cylinders (41) are respectively arranged on two sides of the driving device, the pistons (40) are slidably arranged in each compression cylinder (41), the driving device is simultaneously connected with the two pistons (40), and each compression cylinder (41) is provided with an air inlet one-way valve (50) and an air outlet one-way valve (49).

5. The method for treating exhaust gas of VOCs according to claim 4, comprising: the driving device comprises a driving motor and an eccentric wheel transmission mechanism, and an output shaft of the driving motor is simultaneously connected with the two pistons (40) through the eccentric wheel transmission mechanism.

6. The method for treating exhaust gas of VOCs according to claim 5, comprising: the eccentric wheel transmission mechanism comprises a rotary table (42), a driving plate (43) and a pin shaft (44), wherein two sides of the driving plate (43) are fixedly connected with a piston (40) at the corresponding side through connecting rods (45), a driving long hole (4301) is formed in the driving plate (43), the driving long hole (4301) is perpendicular to the movement direction of the piston (40), the rotary table (42) is arranged on an output shaft of the driving motor, the pin shaft (44) is arranged on the rotary table (42), the pin shaft (44) and the rotary table (42) are eccentrically arranged, and the pin shaft (44) is slidably inserted into the driving long hole (4301).

7. The method for treating exhaust gas of VOCs according to claim 5, comprising: the piston (40) on be provided with installation blind hole (4001), the diameter of the inner of installation blind hole (4001) is greater than the diameter of outer end to form locking portion (4002) at the inner of installation blind hole (4001), be provided with the bayonet lock on the eccentric wheel drive mechanism, the opposite both sides of installation blind hole (4001) are provided with and supply the bayonet lock to enter into the groove (4003) of stepping down in locking portion (4002).

8. The method for treating exhaust gas of VOCs according to claim 1, wherein: the top of recovery jar (16) be provided with reversing device, waste gas entry (22) of recovery jar (16) are passed through reversing device and are linked together with two recovery chamber (18) in turn, the bottom of recovery jar (16) is provided with recovery mouth (21), the lateral part of recovery jar (16) is provided with waste gas export (20), waste gas export (20) set up the downside at the evaporimeter.

9. The method for treating exhaust gas of VOCs according to claim 8, wherein: the reversing device comprises a reversing cylinder (23), sealing plugs (24) and a power device, wherein the upper part of the reversing cylinder (23) is communicated with an exhaust gas inlet (22), the lower part of the reversing cylinder is sealed, an input channel (2301) is arranged at the closed end of the reversing cylinder (23), the input channels (2301) are in one-to-one correspondence with the recycling cavities (18), the lower ends of the input channels (2301) are communicated with the corresponding recycling cavities (18), the diameter of the input channels (2301) is gradually reduced from top to bottom, sealing plugs (24) are arranged in the input channels (2301), and the power device is connected with the two sealing plugs (24) and drives the two sealing plugs (24) to synchronously move in opposite directions.

10. The method for treating exhaust gas of VOCs according to claim 9, wherein: the power device comprises a reversing motor, a driving shaft (27) and a driving arm (25), wherein the driving shaft (27) is horizontally arranged on the reversing cylinder (23), two sides of the driving shaft (27) are respectively connected with sealing plugs (24) at corresponding sides through the driving arm (25), and an output shaft of the driving motor is connected with the driving shaft (27) through a worm gear mechanism.

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