CN107597810B - Waste paint slag reduction drying process method and equipment thereof - Google Patents

Abstract

The invention discloses a waste paint slag reduction drying process method and equipment thereof, and the waste paint slag reduction drying process method is characterized by comprising the following steps: firstly, putting waste paint slag into a drying main machine of a solid-liquid separation system for drying, wherein the pressure in the drying main machine is set as negative pressure; and secondly, the vapor and the organic solvent vapor generated by the drying in the solid-liquid separation system pass through a gas-liquid conversion system to realize gas-liquid conversion. The invention utilizes a decrement drying process, and the dried waste paint slag after treatment is in a honeycomb block shape, thereby solving the core wrapping problem, and simultaneously, the waste water and the waste gas are properly treated, and finally, the decrement of the waste paint slag is realized. The invention can improve the resource utilization rate, save the operation cost and effectively prevent the harmful gas from polluting the environment.

Description

Waste paint slag reduction drying process method and equipment thereof

Technical Field

The invention relates to the technical field of sludge drying, in particular to a waste paint slag reduction drying process method and waste paint slag reduction drying equipment.

Background

With the development of industries such as automobiles, household electrical appliances and the like, more and more industrial wastes are generated, how to effectively treat the industrial wastes becomes an urgent matter for various manufacturers, the occupation cost of earth resources is higher and higher, and especially the proper treatment of waste paint slag and the reduced utilization of the waste paint slag treatment are urgent.

In China, a great deal of research and attempt are made to recycle the organic solvent, but in the prior art, the problem of environmental pollution caused by the process is not considered simply for recycling the organic solvent, the safety coefficient in the treatment process is uncertain, mucous membrane wrapping bubbles can be formed in the treatment process, so that the organic solvent and water cannot be thoroughly separated, and the recycling effect is not ideal.

In view of the above-mentioned drawbacks, the inventors of the present invention have finally obtained the present invention through a long period of research and practice.

The invention creates and utilizes a reduction drying process method and equipment thereof, which can greatly improve the solid content of the paint slag, thereby improving the reduction of the paint slag treatment and improving the resource utilization rate.

Disclosure of Invention

In order to solve the technical defects, the invention adopts the technical scheme that a waste paint slag reduction drying process method and equipment thereof are provided, and the method is characterized by comprising the following steps:

firstly, putting waste paint slag into a drying main machine of a solid-liquid separation system for drying, wherein the pressure in the drying main machine is set as negative pressure;

secondly, steam and organic solvent steam generated by drying in the solid-liquid separation system pass through a gas-liquid conversion system to realize gas-liquid conversion;

thirdly, pumping out the residual gas converted in the gas-liquid conversion system through a vacuum unit in the gas-liquid conversion system, introducing the waste gas generated by conversion into a waste gas treatment system, discharging the waste gas after the waste gas reaches the standard, and recycling the organic solvent through a solvent recoverer;

fourthly, separating and converting the liquid separated by the solid-liquid separation system and the gas-liquid conversion system into sewage and an organic solvent, separating the sewage and the organic solvent by a liquid-liquid separator, recycling the organic solvent by a solvent recoverer, and discharging the sewage after the sewage enters a sewage treatment station to be treated and reach the standard;

fifthly, putting the dried waste paint slag of the solid-liquid separation system into a cooling bin, and treating and discharging gas volatilized from the cooling bin or sending the gas to a waste gas treatment system;

and finally, performing outsourcing treatment on the dried waste paint slag.

Preferably, the equipment for realizing the waste paint residue reduction drying process method comprises a solid-liquid separation system, a liquid-liquid separator, a gas-liquid conversion system, a cooling bin, a solvent recoverer and a waste gas treatment system; the solid-liquid separation system comprises a drying box and a heat conduction oil tank, and heat conduction oil is pumped into the drying box after being heated by the heat conduction oil tank to heat materials.

Preferably, a drying frame pipe is arranged in the drying box and used for processing the materials in the heat insulation process; the heat conduction oil tank comprises a plurality of electric heating pipes for heating heat conduction oil and providing a heat source for the drying tank.

Preferably, the bottom of the drying box is provided with a sewage discharge unit for discharging liquid impurities.

Preferably, the sewage discharging unit comprises a sewage discharging groove and a sewage discharging hopper, the sewage discharging groove is a slope-shaped groove which is symmetrical left and right, and the lower end of the slope-shaped groove is connected with a pipeline to form the sewage discharging hopper.

Preferably, a tray filled with materials is placed on the drying frame pipe, and a polytetrafluoroethylene coating is coated on the tray.

Preferably, the thickness of the coating film is 0.3-1 mm.

Preferably, the bottom of the heat-conducting oil tank is provided with a sewage draining outlet for cleaning oil residue.

Preferably, the drying box further comprises a detection unit for collecting and displaying data in the drying box.

Preferably, the drying box further comprises a control unit for setting and controlling various parameters of the drying box.

Preferably, a heat insulation layer is arranged between the drying box body and the outer shell.

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

the invention 1, by using the decrement drying process, the dried waste paint slag is in a honeycomb block shape, the core wrapping problem is solved, and simultaneously, the waste water and the waste gas are properly treated, and finally, the decrement of the waste paint slag is realized. The invention can improve the resource utilization rate, save the operation cost and effectively prevent the harmful gas from polluting the environment.

2, the inside of the drying box of the solid-liquid separation system is in a negative pressure environment, so that on one hand, the boiling points of water and an organic solvent are reduced, the water and the organic solvent are evaporated and pumped out at a lower temperature, and on the other hand, the formation of mucous membrane wrapped bubbles in the drying process of the waste paint slag is destroyed, so that the dried waste paint slag is in a honeycomb block shape, the core wrapping problem is solved, the waste paint slag is dried thoroughly, the working efficiency of the solid-liquid separation system is effectively improved, and the drying efficiency is better.

3, the liquid-liquid separator of the invention separates the mixed liquid by adjusting the lifting device according to the specific gravity difference of the mixed liquid, the cost of the whole separation process is low, and the good separation standard is achieved. The guide plate is used for preventing the inflow from washing out the fluctuation of the layered interface, lengthening the flow channel, preventing short circuit, reducing dead angles and fully utilizing the space.

4, the gas-liquid conversion system can prevent organic solvent from adhering, flows to the buffer tank by gravity, pumps the cooled air to the water tank by a vacuum pump device by water circulation, and intercepts partial residual organic solvent in the water tank to prevent secondary pollution.

5, the solid-liquid separation system adopts the tray which has the advantages of simple structure, reasonable design, uniform heating, energy conservation, environmental protection and the like, and the polytetrafluoroethylene coating is coated on the tray body, so that the tray has good anti-sticking performance and high temperature resistance, is suitable for drying work of various materials, and is particularly suitable for materials with larger viscosity.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.

FIG. 1 is a system block diagram of the present invention;

FIG. 2 is a front view of the drying cabinet;

FIG. 3 is a left side view of the drying cabinet;

FIG. 4 is a schematic view of the construction of a drying rack;

FIG. 5 is a front view of the tray;

FIG. 6 is a top view of the tray;

FIG. 7 is a front view of a thermally conductive oil tank;

FIG. 8 is a right side view of the thermally conductive oil tank;

FIG. 9 is a schematic view of the structure of the recovery unit;

FIG. 10 is a top view of a liquid-liquid separator;

FIG. 11 is a front view of a liquid-liquid separator;

FIG. 12 is a front view of a liquid-liquid separator lift;

FIG. 13 is a top view of a gas-to-liquid conversion system;

FIG. 14 is a perspective view of a gas-liquid conversion system;

FIG. 15 is a front view of a cooling silo;

FIG. 16 is a left side view of the cooling silo;

FIG. 17 is a schematic view of an upward opening door of the cooling silo;

FIG. 18 is a flow chart of a waste paint slag reduction drying process;

FIG. 19 is a schematic view of a charge cooling silo in example 4;

fig. 20 is a schematic structural view of a panel of the weighing apparatus in embodiment 4.

Detailed Description

The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

Example 1

As shown in fig. 1, a waste paint slag reduction drying device comprises: the system comprises a solid-liquid separation system 1, a liquid-liquid separator 2, a gas-liquid conversion system 3, a cooling bin 4 and a waste gas treatment system 5.

Putting the waste paint slag into a solid-liquid separation system 1, drying the waste paint slag under a negative pressure state, and pumping out water vapor, sewage and an organic solvent generated in the drying process to realize solid-liquid separation; sending the dried waste paint slag for a certain time into a cooling bin 4 for cooling treatment; the extracted sewage and the organic solvent enter a liquid-liquid separator 2 for separation, the organic solvent can be recycled after being stored in a storage box, and the sewage enters a sewage treatment system for treatment and discharge after reaching the standard; the evaporated gas enters a gas-liquid conversion system 3 for treatment, the separated waste gas is discharged through a waste gas treatment system 5 after reaching the standard, and the separated sewage and the organic solvent enter a liquid-liquid separator 2 for further treatment.

The solid-liquid separation system 1 consists of a drying box 11 and a heat conduction oil tank 12, wherein the drying box 11 is used for carrying out exhaust and pollution discharge treatment on waste paint slag in a heat insulation process to realize solid-liquid separation; the heat-conducting oil tank 12 is used for providing a heat source for the drying tank 11 and heating the waste paint slag by a heat conduction principle. The two are used in a matching way to meet the requirements of product development and production and effectively improve the production efficiency.

As shown in fig. 2 and 3, which are a front view and a left view of the drying box, respectively, and a left side of AA' in fig. 2 is a sectional view. The drying box 11 includes: the drying box comprises a drying box body 111, a pollution discharge unit 112, a detection unit 113, a control unit 114, a shell 115 and a tray 116.

As shown in fig. 4, the drying box body 111 is provided with a drying rack, which is of a multi-layer structure and is detachably disposed in the drying box body 111, and the drying rack includes a medium inlet 1111, a medium outlet 1112, and a drying rack pipe 1113. The medium inlet 1111 and the medium outlet 1112 are used as connection ports of the drying box 11 and the heat conduction oil tank 12, heat conduction oil output from the heat conduction oil tank 12 enters the drying box 11 from the medium inlet 1111, and is dried by passing through each pipeline of the drying rack. Finally, the heat transfer oil is output from the medium outlet 1112 to the drying box 11 and returns to the heat transfer oil tank 12 for reheating. The drying rack is used for placing a tray 116 for containing the waste paint residues, and the heat conducted by the drying rack pipes 1113 of each layer is fully utilized to achieve the purpose of accelerating the drying of the waste paint residues according to the principle that hot air rises. The distance between the two layers of drying rack pipes 1113 close to the lower end is smaller than the distance between the two layers of drying rack pipes 1113 at the upper end, and by the structural design, the defect of uneven temperature field of the conventional static vacuum drying box is overcome, so that the waste paint slag is quickly vaporized in a lower-temperature environment, and the drying is accelerated.

As shown in fig. 5 and 6, which are a front view and a plan view of the tray, the tray 116 includes: a tray body 1161 and a tab 1162. The tray body 1161 is used for containing waste paint residues to be dried, the shape of the tray body is not limited to a rectangle, and the tray body can be designed into a circle, an ellipse and other shapes according to actual needs. A pull ring 1162 is provided at one side of the tray body 1161 for a user to conveniently pull the tray. The tray 116 is coated with a polytetrafluoroethylene coating film, the thickness of the coating film is 0.3-1mm, the coating film design enables the tray to have good anti-adhesion performance, waste paint residues are effectively prevented from being adhered to the tray, inconvenience is brought to drying work, on the other hand, the coating film has good high temperature resistance, the highest temperature can reach 250 ℃, and the tray is suitable for drying work of various materials.

In the drying process, water vapor and organic solvent are evaporated to separate the solid waste paint slag, and the drying box 11 is also provided with a vacuum pump and a vacuum valve (the two are not shown in the drawing). The vacuum valve controls the vacuum pump to form a negative pressure environment in the drying box 11, and the pumped gas and organic solvent are discharged from a vacuum port 1154 on the shell. Firstly, the safety factor in the drying process can be ensured under the negative pressure environment, and explosion caused by sudden release of gas is prevented; secondly, the boiling points of water and the organic solvent are reduced in the negative pressure environment, so that the water and the organic solvent are evaporated at a lower temperature, the energy consumption for treatment is reduced, and the solid-liquid separation efficiency is improved; thirdly, the generated gas is timely pumped out in the negative pressure environment, the formation of air bubbles wrapped by mucous membranes of the waste paint slag in the drying process is damaged, the dried waste paint slag is in a honeycomb block shape, the core wrapping problem is solved, and the waste paint slag is thoroughly dried. And selecting a proper vacuum pump according to the boiling point, the evaporation capacity and the drying requirement of the waste paint slag.

The drying box 11 is provided with a sewage discharge unit 112, which comprises: a sewage tank 1121, a sewage bucket 1122, a first sewage valve 1123, and a first sewage pump 1124. At the bottom of the left side of the drying box 11, below the last drying rack pipe 1113, a drainage trough 1121 is provided, which is a slope-shaped groove with bilateral symmetry, and the drainage trough 1121 is connected with a pipeline to form a drainage hopper 1122. During the drying process, a part of the generated mixed gas is discharged from the vacuum port 1154, after the drying process is finished, water drops flow downwards along the inner wall and are stored in the sewage bucket 1122 along the sewage groove 1121, and condensed water cannot drop to the ground, so that the environment is prevented from being polluted. The drain hopper 1122 is connected to a first drain valve 1123 and a first drain pump 1124, and when the accumulated water in the drain hopper 1122 reaches a certain amount, the accumulated water is discharged out of the tank body by the action of the first drain valve 1123 and the first drain pump 1124. The first sewage discharging pump 1124 avoids the manual sewage treatment, and can treat sewage quickly and completely, thereby greatly improving the working efficiency.

The detection unit 113 comprises a thermometer 1131 and a vacuum meter 1132, which respectively collect data in the drying box through a temperature sensor or a thermometer and a vacuum pressure sensor, and display real-time data, so that the worker can observe and set the environment inside the drying box 11 conveniently.

The control unit 114 is a multifunctional electric control box, which is used for setting and controlling various parameters of the drying box 11, and mainly has the following functions: firstly, controlling the circulation and the cut-off of a high-temperature heat-conducting medium circulating in the drying rack, arranging electromagnetic valves at a medium inlet 1111 and a medium outlet 1112 respectively, and realizing the automatic and manual dual control of the circulation and the cut-off of the high-temperature heat-conducting medium under the combined action of a control unit 114 and the electromagnetic valves; secondly, setting a preset temperature in the drying box body 111, and stopping heating when the data detected by the thermometer is higher than the preset temperature, so as to achieve the purpose of temperature control; and thirdly, controlling the vacuum pump and the vacuum valve to regulate and control the gas flow and speed of the extracted gas if the gas is extracted outwards, so as to achieve the purpose of pressure control.

The shell 1151 of the shell is made of a stainless steel plate, so that the shell is convenient to clean, has a good anti-corrosion effect on acid and alkali, and has high practicability and attractiveness. An insulating layer 1152 is disposed between the outer casing 1151 and the drying box body 111 for maintaining the temperature inside the drying box body 111, thereby improving the heating efficiency. The drying box 11 is supported and installed by at least four supporting legs 1157, and has good stability.

The front and back directions of the surface of the shell are respectively provided with a sight glass 1153, so that the drying condition of the waste paint slag can be observed conveniently, and the sealing requirement can be met. The drying cabinet 11 is provided with a sealing door 1155 on which a door handle 1156 is mounted, and the sealing door is hinged with bearings. The sealing door 1155 is light and convenient to open and can freely swing on the whole sealing surface in a micro-scale, in addition, a sealing ring and a locking wheel 1158 are arranged at the joint of the sealing door and the box body so as to be attached to the sealing surface to improve the vacuum degree in the drying box, and thus, the waste paint slag can be rapidly gasified in a lower temperature environment to accelerate drying. Composite calcium-based lubricating grease is added at the oil cup position and the ball joint hinge position of the sealing door hinge, so that the sealing door can be opened and closed conveniently. The sealing ring is made of polytetrafluoroethylene materials and has the effects of high temperature resistance and solvent corrosion resistance.

As shown in fig. 7, the heat-conductive oil tank 12 includes: the oil-cooling oil tank comprises an oil inlet unit 121, a heat-conducting oil tank body 122, a heat-conducting oil outlet 123, a drain outlet 124 and a recovery unit 125.

The oil feed unit 121 includes: an oil filling bucket 1211, a stop valve 1212, a head tank 1213 and a heat conducting oil return port 1214.

The oil filling bucket 1211, the stop valve 1212 and the elevated tank 1213 are connected in sequence through pipelines, are located at the upper end of the heat-conducting oil tank body 122, add heat-conducting oil through the oil filling bucket 1211, and the stop valve 1212 is dependent on the pressure of the valve rod, so that the sealing surface of the valve clack is tightly attached to the sealing surface of the valve seat, and further the circulation and the stop of the heat-conducting oil are controlled. The lower end of the head tank 1213 is connected to the heat conductive tank body 122 via a pipe. The header tank 1213 functions as: the heat conduction oil is accommodated, and the heat expansion amount is increased, and nitrogen sealing is performed. The nitrogen sealing is performed to prevent the heat transfer oil in the heat transfer oil tank body 122 from being oxidized due to contact with air, and a certain pressure may be applied to maintain liquid phase operation.

Preferably, a breathing hole 1215 is formed in the top of the elevated tank 1213, so that the internal and external air pressures of the elevated tank can be balanced, the heat conduction oil is kept in a normal pressure state, and the breathing hole is further provided with an exhaust treatment device.

The heat conducting oil return port 1214 is disposed at one end of the heat conducting oil tank body 122, and is connected to the medium outlet 1112 through a pipeline, so that the heat conducting oil flowing through the drying tank is reduced in temperature through heat conduction, and returns to the heat conducting oil tank 12 through the heat conducting oil return port 1214 to be heated again.

The conduction oil outlet 123 is disposed on the conduction oil tank body 122 at the other end opposite to the conduction oil return port 1214. The heat conduction oil return port 1214 and the heat conduction oil outlet 123 are arranged at two ends of the heat conduction oil tank body 122, so that the heat conduction oil can be sufficiently heated in the heat conduction oil tank body 122, and the working efficiency is effectively improved.

The heat conductive oil tank body 122 includes: the heating device comprises a shell 1221, an insulating layer 1222, an electric heating pipe 1223, a liquid level meter 1224, a foot 1225 and a heating zone 1226.

The casing 1221 bottom is strengthened back welding footing 1225 with the channel-section steel, fully guarantees the sturdiness and the stability of whole heat-conducting oil tank 12. An insulating layer 1222 is disposed between the housing 1221 and the heating zone 1226, and is used to maintain the temperature in the heating zone 1226, thereby improving the heating efficiency. A plurality of electric heating pipes 1223 are disposed in the heat conductive tank body 122. The electric heating tube 1223 is a tubular electric heating element, and is composed of metal tube resistance wire or spiral resistance wire, and crystallized magnesium oxide powder, etc., the high-temperature resistance wire is uniformly distributed in the stainless steel seamless tube, and the crystallized magnesium oxide powder with good heat-conducting property and insulating property is filled in the gap portion, so that the structure is simple, the heat efficiency is high, and the heating is uniform. When current passes through the high-temperature resistance wire, the electric heating pipe converts electric energy into heat energy, and the generated heat energy is diffused to the surface of the metal pipe through magnesium powder and then is transferred into heated heat conduction oil, so that the purpose of heating is achieved. Compared with other traditional heating modes, the heating mode through the electric heating pipe is pollution-free, convenient to install and high in cost performance.

The heat conduction oil tank body further comprises a liquid level meter 1224, the liquid level meter 1224 is used for measuring the liquid level of heat conduction oil in the heating area 1226, and the liquid level meter 1224 has the advantages of being good in stability, high in precision and high in reliability. By observing the liquid level display of the liquid level meter 1224, a user can supplement heat conduction oil in time, so that the liquid level protection effect is achieved, and the electric heating pipe is prevented from being burnt out due to oil cut.

As shown in fig. 8, a drain outlet 124 is provided on the back of the heat-conducting oil tank 12, so that when the heat-conducting oil tank stops working or the internal heat-conducting oil is exhausted, the oil residue accumulated at the bottom can be discharged through the drain outlet.

As shown in fig. 9, a recovery unit 125 is further disposed above the heat-conductive oil tank body 122, and includes: a first pressure equalization 1251, a second pressure equalization valve 1252, a condensing device 1253, a carbon adsorption device 1254, a conduit 1255. A conduit 1255 extends from the heat-conducting oil tank body 122, and is connected to the first pressure balance valve 2251, the condenser 1253, and the second pressure balance valve 1252 in sequence, and finally returns to the heat-conducting oil tank body 122 to form a closed loop. In the process of heating the heat conducting oil, water, liquid oil and impurities in the air can be heated and volatilized, and the mixed gas enters the condensing device 1253 along the pipeline 2255 under the action of the first pressure balance valve 1251. The condensing temperature of the condensing unit 1253 is generally set to 100-200 ℃, i.e. the oil vapor can be liquefied, and the vapor of the water vapor or other impurity liquid is still in a gaseous state. Then, the mixed gas enters the carbon adsorption device 1254 to complete the impurity removal, and the liquid oil returns to the heat-conducting oil tank body 122 along the pipeline under the action of the second pressure balance valve 1252. The purpose is to prevent secondary pollution, and the relative purity of the heat conduction oil in the heat conduction oil tank body can be ensured, thereby being beneficial to industrial production and utilization.

When the thermal conduction oil tank works, the thermal conduction oil is input from the oil filling bucket 1211, enters the thermal conduction oil tank body 122 through the elevated tank 1213, is electrified in the heating zone 1226, and converts electric energy into heat energy, diffuses to the surface of the metal pipe through magnesium powder, and then conducts into the thermal conduction oil to achieve the purpose of heating. Medium import 1111 passes through the pipe connection with conduction oil-out 1223, and medium export 1112 passes through the pipe connection with conduction oil return port 1214, and the conduction oil that the heating was accomplished alright with transport mummification case 11, carries out the mummification to the paint waste sediment and handles, and according to the heat-conduction principle, the conduction oil temperature reduces, gets into heat conduction oil tank 122 by conduction oil return port 1214 again, can endless like this provide the conduction oil of certain temperature for mummification case 11, and is both convenient and practical. The waste paint slag in the drying box 11 still has high temperature after being dried, can volatilize harmful gas, and is placed in a cooling bin for storage and treatment, so that the harmlessness of the whole waste paint slag treatment process is realized.

In the heating process, the liquid level of the heat conduction oil in the heat conduction oil tank body 122 can be observed at any time through the liquid level meter 1224, if the liquid level is too low, the heat conduction oil is supplemented in time, the liquid level protection effect is achieved, and the electric heating pipe 1223 is prevented from being burnt due to oil cut; the mixed gas enters the recovery unit 125, impurities are removed under the action of the mixed gas, and the recovered heat conduction oil returns to the heat conduction oil tank body 122 again. By the mode, the relative purity of the heat conduction oil and the cleanliness of the whole equipment can be ensured, and the industrial production and utilization are facilitated.

As shown in fig. 10, the liquid-liquid separator 2 includes a tank 21, a mixed liquid chamber 22 and a solvent chamber 23 are provided at both sides in the tank 21, and a liquid separation plate 24 is provided between the mixed liquid chamber 22 and the solvent chamber 23 to separate the mixed liquid chamber 22 and the solvent chamber 23. The liquid separation plate 24 is provided with a gap, a lifting device 25 is arranged in the gap and used for conveying the organic solvent in the mixed liquid bin 22 to the solvent bin 23, the mixed liquid is separated by adjusting the lifting device according to the specific gravity difference of the mixed liquid, the cost of the whole separation process is low, and the good separation standard is achieved.

The mixed liquid bin 22 comprises a liquid inlet 221 and a water outlet 222, and is used for injecting mixed liquid and discharging separated water and impurities, the liquid inlet 221 is arranged above one side of the mixed liquid bin 22 corresponding to the side wall of the box body 21, and the water outlet 222 is arranged below the same side of the mixed liquid bin 22 corresponding to the side wall of the box body 21.

As shown in fig. 11, the mixed liquid chamber 22 further includes a pair of long hole mirrors 225 respectively disposed above the water outlet 222 and corresponding to each other on both sides of the chamber. The device is used for observing the layering condition of the mixed liquid and the condition that the organic solvent flows into the solvent bin.

The solvent bin 23 includes a liquid outlet 231, which is disposed below one side of the sidewall of the box corresponding to the solvent bin 23, and is used for discharging the organic solvent in the solvent bin after separation.

As shown in fig. 12, the lifting device 25 includes a screw 251, and a hand wheel 252 is connected to an upper end of the screw 251 for controlling the fixed position of the screw 251 after moving up and down. The lower end of the screw 251 passes through the box 21 and is connected with the liquid outlet 254 through a connecting part 253. A triangular opening 2541 is formed above the liquid outlet 254 for discharging the organic solvent. Before use, the lifting device 25 lifts the triangular opening 2541 of the liquid outlet portion 254 to above the liquid barrier via the lead screw 251, and is fixed to the case 21 via the hand wheel 252 so as to separate the mixed liquid tank 22 and the solvent tank 23. When the mixed liquid is completely separated and discharged, the liquid outlet part 254 is controlled to discharge liquid through the hand wheel 252 and the lead screw 251.

Preferably, the guide plates are arranged on two sides of the mixed liquid bin 22 and used for preventing inflow water from flushing layered interface fluctuation, lengthening the flow passage, preventing short circuit, reducing dead angles and fully utilizing space. Such as: the bottom of the first guide plate 223 is connected with the bottom of the box body 21, one side of the first guide plate 223 is connected with the inner wall of one side of the mixed liquid bin, and the other two sides are not connected. The bottom of the second guide plate 224 is connected with the bottom of the box body 21, the other side of the second guide plate 224 corresponding to the first guide plate 223 is connected with the inner wall of the other side of the mixed liquid bin, and the other two sides are not connected. The first guide plate 223 and the second guide plate 224 are arranged at opposite positions of the connecting side wall, and are staggered at two sides in the box body 21 with a certain distance between the two sides, so that the mixed liquid can pass through. The number of the guide plates and the distance between the guide plates can be adjusted according to actual needs. When the liquid flows, the liquid flows in a bow shape and is between the guide plates, and under the action of gravity, the mixed liquid slowly flows and precipitates for a certain time along with the liquid, and the mixed liquid is layered.

Preferably, a liquid level device 2542 is further connected to the liquid separation plate 254, and a floating plate 2543 is connected to the other end of the liquid level device 2542, so that the floating condition of the liquid level device 2542 can be clearly observed. The liquid level device 2542 is fixedly connected with the lower vertex of the triangular opening 2541 on the liquid separation plate, when the liquid level device is adjusted to a liquid-liquid separation interface, the liquid regulator is fixedly connected with the liquid level device, the triangular opening 2541 is adjusted to the separation interface, and the organic solvent flows into the solvent bin 23 through the triangular opening, so that liquid-liquid separation is accurately realized.

Preferably, a vacuum pump (not shown) is disposed outside the solvent bin 23 for pumping the organic solvent.

Before the liquid-liquid separator operates, the lifting device 25 lifts the triangular opening 2541 of the liquid outlet portion 254 to the upper side of the liquid barrier 24 through the lead screw 251, and is fixed to the tank body 21 through the hand wheel 252 so as to separate the mixed liquid tank 22 and the solvent tank 23. Then, the mixed solvent is poured from the liquid inlet 221, the mixed solvent flows into the mixed liquid chamber 22, a plurality of guide plates are arranged in the mixed liquid chamber, the guide plates prevent the inflow water from flushing out layering interface fluctuation, the flow channels are lengthened to enable the temperature of the mixed solvent to be stable, and the mixed solvent is layered in the mixed liquid chamber 22 due to the action of gravity. The layered state is observed in the long hole sight glass 225 outside the mixed liquid chamber 22, and after the layered state of the mixed liquid is observed, the hand wheel 252 is rotated to move the screw 251 up and down. By moving the screw 251 up and down, the level gauge 2542 of the lifting device 25 points between the solvent and the water, and then the vacuum pump is started to pump the layered organic solvent into the solvent chamber through the triangular notch of the lifting device 25. Finally, the sewage is discharged from a water outlet of the mixing chamber, and the organic solvent is discharged from a solvent liquid outlet of the solvent chamber.

As shown in fig. 13 and 14, the gas-liquid conversion system 3 includes: condensing unit 31, buffer device 32, water tank device 33, refrigerating unit 34 and cooling tower 35.

The condensing unit 31 includes a heat exchanger 311 having an inclination angle of 15 to 90 degrees to prevent the organic solvent from adhering. The heat exchanger 311 is a shell-and-tube heat exchanger, and the steam flows in the tube coil; the refrigerant medium flows around the tube. And the upper and lower ends of the heat exchanger 311 are respectively provided with a refrigerant medium inlet 313 and a refrigerant medium outlet 314, and the refrigerant medium inlet 313 and the refrigerant medium outlet 314 are respectively connected with the refrigerating unit 34 to form refrigerant medium circulation. The continuous circulation of the refrigerant medium enables the steam in the pipe to be effectively converted into a liquid form. The chiller unit 34 also includes an external cooling tower 35 and/or air cooling device (not shown) for continuously exchanging heat with the chiller unit 34 via a cooling tower 355. The heat exchanger 311 further comprises a first inlet pipe orifice 312 and a first outlet pipe orifice 315. The first air inlet pipe port 312 is connected to the external connection pipe 3121 of the steam source, the first liquid outlet pipe port 315 is connected to the buffer device 32, and the buffer device 32 is used for temporarily storing the converted organic solvent and the liquid such as water.

The condensing unit further includes a pair of brackets 316 for supporting the entire condenser 311 and positioning the condenser 31 above the buffer unit 32 and the water tank unit 33.

The buffer device 32 includes a tank 321, a second liquid inlet pipe 322 and a second gas outlet pipe 323 are disposed at two ends of the upper portion of the tank 321, the second liquid inlet pipe 322 is connected to the first liquid outlet pipe 315 of the condensing device 31, the second gas outlet pipe 323 is connected to the first vacuum device 36, and a second liquid outlet 325 is disposed at the lower end of the tank 321 for discharging the buffered organic liquid. The bottom of the tank 321 is further provided with a base 424 for supporting the whole buffer device.

The first vacuum device 36 comprises a first vacuum pump 361, the first vacuum pump 361 is connected with a check valve 365 and a fourth liquid outlet pipe 363, and the other end of the check valve 365 is connected with the second gas outlet pipe 323 of the buffer device 32 through a second gas inlet pipe 362; a third end 3651 of the check valve 365 is connectable to an exhaust gas treatment system 5 for treating exhaust gas overflowing during some processes to prevent the exhaust gas from being discharged to pollute the environment, and a fourth outlet pipe 363 is connected to the third inlet 333 of the water tank device 33.

The vacuum pump 361 is also connected to a second valve 364, which is connected to the water tank and controls the flow rate of the water circulation through the valve. The cooled air is pumped to the water tank through water circulation by using the vacuum pump device, and partial residual organic solvent is intercepted in the water tank, so that secondary pollution is prevented.

The water tank device 33 includes a tank body 331, a third water inlet pipe 332 is provided at an upper end of the tank body 331, and a third liquid inlet 333 is provided at a side surface thereof. For connection to a first vacuum device 36; the lower end of the case body 331 is provided with a third valve 336 for discharging the waste water in the water tank. The third valve 336 may also be connected to a waste water treatment device to ensure that the discharged waste water is free of pollution. The lower end of the case body 331 is further provided with legs 334 for supporting the entire water tank.

Preferably, a liquid level gauge 326 is provided outside the buffer tank for observing the liquid level inside the buffer tank.

Preferably, the buffer tank is further provided with a second vacuum device 37, the second vacuum device has the same structure as the first vacuum device, and is used for standby, so that the whole system cannot work normally when the first vacuum device fails.

Preferably, a baffle and a liquid level meter 335 are further disposed in the water tank 33. The guide plates are arranged on two sides of the water tank in a staggered mode, a certain distance is reserved between the guide plates, and mixed liquid can pass through the guide plates. The number of the guide plates and the distance between the guide plates can be adjusted according to actual needs. When the liquid flows, the liquid flows in a bow shape and is between the guide plates, and under the action of gravity, the mixed liquid slowly flows and precipitates for a certain time along with the liquid, and the mixed liquid is layered. When the organic solvent is discharged, the water tank is manually filled with water, the water is supplied to the fifth liquid outlet 381 as viewed through the liquid level meter 335, and is drawn out together with the liquid in the buffer tank 32 by the third vacuum pump 38 and transferred to the liquid-liquid separator.

When the gas-liquid conversion system is ready to work, the heat exchanger is connected with the refrigerating unit, the refrigerant medium of the refrigerating unit enters water through the first refrigerant medium inlet pipe orifice, then exits from the first refrigerant medium outlet pipe orifice and enters the refrigerating unit for condensation, and the temperature of the shell side of the inner side and the outer side of the heat exchanger is continuously maintained at the temperature required by people. Vapor and harmful gas get into the heat exchanger through first inlet pipe mouth and flow into the buffer tank through the condensation, and the level gauge that the buffer tank set up observes after liquid reachs a certain position, through taking out of third empty pump. And the future water vapor and harmful gas converted from gas and liquid are recycled into the water tank by the first vacuum device through water circulation. Because the organic solvent and the water can be layered for a long time and the surplus is small, the water can be manually added into the water tank and pumped to the liquid-liquid separator by utilizing the third vacuum pump.

As shown in fig. 15 and 16, the cooling silo 4 includes: body 41, exhaust fan 43, wind channel 44, adsorption equipment 45, air exit 46.

The body 41 is a closed container, and is a main body for supporting and containing the cooling bin, and is used for containing the waste paint slag to be cooled and connecting other components, and the body needs to have certain structural strength and a proper volume-volume ratio. The front end and/or the rear end of the body 41 are/is provided with a door 411, the door 411 is used for adding high-temperature waste paint slag into the cooling bin, and after cooling is finished, low-temperature waste paint slag is taken out from the cooling bin. The lower extreme of body 41 is equipped with gyro wheel 413, makes things convenient for the removal of cooling feed bin, is convenient for anytime and anywhere add and take the paint waste sediment.

The bottom of body 41 is equipped with air inlet otter board 412, and it has good ventilative nature, ensures that the air can pass its gap and get into the material layer to reach the mesh of cooling waste paint sediment, still have the effect of bearing waste paint sediment in addition, prevent that waste paint sediment from falling down. An exhaust fan 43 is arranged at the upper end of the body, under the action of the exhaust fan, a large amount of air enters the inside of the body 41 through the air inlet mesh plate, and enters an air duct 44 connected with the body 41 after passing through the material layer, and the other end of the air duct 44 is connected with an adsorption device 45. In whole cooling process, high temperature paint waste residue surface has the material evaporation, can produce poisonous, smelly gas even, and the mist gets into adsorption equipment 45 via the wind channel and carries out the edulcoration, finally discharges nontoxic tasteless gas at air exit 46, effectively prevents to cause the pollution to the air.

The working process of the cooling bin comprises the following steps: a door 411 is selected as an inlet for adding the waste paint slag, after the waste paint slag is put in, the exhaust fan 43 is started, and external air enters the body 41 through the air inlet screen plate 412. In body 41, the air fully contacts with the paint waste sediment, under the effect of air exhauster 43, with the air extraction from bottom to top, in this process, on the one hand, according to hot-conductive principle, reduce the temperature of paint waste sediment, on the other hand, with the toxicity that the paint waste sediment gived off, odorous gas is taken away, the mist is via wind channel 44, and adsorption equipment 45 adsorbs the edulcoration, final air exit 46 is with nontoxic tasteless air escape cooling feed bin, make the paint waste sediment cooling even and work efficiency high. After the waste paint slag is stored in the cooling bin for a suitable time, it can be taken out by another door 411. When the cooling operation is completed, the suction fan 43 is turned off.

Preferably, as shown in fig. 17, an upper opening door 414 is opened at the top of the body 41, and the waste paint residues are put in through the upper opening door 414 and taken out through an opening door 411 at the front end of the body 41. The mode is only to add the waste paint slag into the body 41 in a single direction, so that the work of adding the waste paint slag is more convenient, and the practicability is higher.

Preferably, the adsorption device 45 is an activated carbon adsorption device, which has the advantages of large surface area, moderate aperture, fast adsorption speed and less impurities, and can efficiently complete the impurity removal work.

The exhaust gas treatment system 5 may be any one of the exhaust gas treatment devices of the prior art, and is not limited herein.

Example 2

As shown in FIG. 18, the invention provides a waste paint slag reduction drying process, which comprises the following steps:

firstly, putting waste paint slag into a drying host machine in a solid-liquid separation system 1 for drying, wherein the drying host machine is set to be in a negative pressure environment;

secondly, cooling the water vapor and the organic solvent generated by the drying in the solid-liquid separation system 1 by a refrigerating unit 34 to realize gas-liquid conversion;

thirdly, pumping out the water vapor and the organic solvent by using a vacuum pump, introducing the gas into a waste gas treatment system 5, discharging after the gas reaches the standard, and recycling the organic solvent;

fourthly, the liquid separated by the solid-liquid separation system 1 and the gas-liquid conversion system 2 is sewage and an organic solvent, the organic solvent is recycled by a solvent recoverer, and the sewage enters a sewage treatment station for treatment and is discharged after reaching the standard.

Fifthly, discharging after drying for 6h, putting the just discharged waste paint slag into a cooling bin 4, and treating and discharging gas volatilized from the cooling bin or sending the gas to a waste gas treatment system.

And finally, performing outsourcing treatment on the dried waste paint slag.

Example 3

The difference between the embodiment and the embodiment is that a thermometer of the waste paint slag decrement drying device can adopt a glass rod point-retaining thermometer or a platinum thermal resistance sheet. Since the gas molecules are quite inactive in movement under vacuum, a common thermometer cannot display the true temperature of the waste paint slag, but only the relative temperature of the waste paint slag. The position indicated by the mercury column of the remaining point thermometer does not drop along with the drop of the temperature, and remains and indicates the highest point which is reached once; the platinum thermistor element, which usually adopts industrial mica platinum resistor as temperature measuring sensor, is used together with temperature transmitter, regulator and display instrument to form a process control system, and can be used to directly measure or control the temperature of liquid, steam and gas medium and solid surface in various production processes. In conclusion, the thermometer adopts a glass rod spot thermometer or a platinum thermal resistance sheet, and can accurately measure the temperature of the waste paint slag in the drying box.

Example 4

The cooling silo 4 can be replaced by a gravimetric cooling silo 4 ', as shown in fig. 19, the gravimetric cooling silo 4' differs from the cooling silo 4 in that: the cooling storage bin is provided with a weighing device 47 ', the storage bin body is connected with the weighing device 47 ', in other words, the bottom plate of the cooling storage bin body 41 is a weighing platform of the weighing device 47 ', and a polytetrafluoroethylene coating is arranged on the bottom plate, so that the cooling storage bin is suitable for waste paint slag with high viscosity; the air inlet net plate 412' is arranged at the left and right sides of the body.

The weighing platform of the weighing device 47 'is integrated with the bottom plate of the stock bin body, the weighing device 47' is further provided with a panel which is arranged on the stock bin body 41, different buttons and displays are arranged on the panel, the weighing of the waste paint slag in the weighing cooling stock bin is realized through the operation of the panel, and the reading is obtained in the display. As shown in fig. 20, it is a schematic structural diagram of a weighing machine panel, and the panel includes: a tare weight metering button 471 ', a gross weight metering button 472', a net weight metering button 473 ', a net weight accumulation button 474', a clear button 475 ', a return button 476', a first display 477 ', a second display 478', a third display 479 ', and a fourth display 4710'.

The weighing process of the weighing cooling bin comprises the following steps: when the waste paint slag is not added in the weighing cooling bin, pressing a tare weight metering button 471 'and displaying the corresponding weight on the first display 471'; adding waste paint slag into the weighing cooling bin, and after the waste paint slag is added, pressing the gross weight measuring button 472 'and displaying the corresponding weight in the second display 478'; pressing the net weight metering button 473 'calculates the net weight and displays the net weight, i.e., the weight of the waste paint slag in the cooling reservoir, in the third display 479'; pressing the net weight accumulation button 474 'accumulates net weight, and the accumulated net weight is displayed on the fourth display 4710'; if the metering is carried out again, a clear button 475' is pressed for clearing; if no record is made, it is simply weighed and no button is pressed, the first display 477' displays the weighed weight. In the weight-calculating cooling storage bin use, if it is too much to put into the waste paint sediment that needs cooling, can reduce cooling effect, cause the inside cooling of waste paint sediment inhomogeneous, if put into the waste paint sediment too little, can waste use cost. Through the weighing function of the weighing cooling bin, the net weight calculating function and the accumulating function, the quantity of the waste paint slag cooled each time can be well controlled, and the working efficiency of the weighing cooling bin is effectively improved.

The cooling process of the gravimetric cooling silo 4' is the same as for the cooling silo 4.

The foregoing is merely a preferred embodiment of this invention, which is intended to be illustrative, and not limiting. It will be understood by those skilled in the art that various changes, modifications and equivalents may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A waste paint slag reduction drying process method is characterized by comprising the following steps: firstly, putting waste paint slag into a drying main machine of a solid-liquid separation system for drying, wherein the pressure in the drying main machine is set as negative pressure; the solid-liquid separation system comprises a drying box and a heat conduction oil tank, wherein heat conduction oil is heated by the heat conduction oil tank and then pumped into the drying box to heat materials; forming a negative pressure environment in the drying box, and pumping out gas and organic solvent;

secondly, steam and organic solvent steam generated by drying in the solid-liquid separation system pass through a gas-liquid conversion system to realize gas-liquid conversion;

the gas-liquid conversion system includes: the system comprises a condensing device, a cache device, a water tank device, a refrigerating unit and a vacuum unit; the condensing device is respectively connected with the cache device, the refrigerating unit and the vacuum unit; the vacuum unit is connected with the water tank device; the condensing device is used for converting the water vapor into organic liquid; the buffer device is used for storing the organic liquid; the water tank device is used for trapping the organic solvent; the refrigerating unit is used for enabling the condensing device to form refrigerant circulation; the vacuum unit is used for pumping out residual gas;

thirdly, pumping out residual gas converted in the gas-liquid conversion system through the vacuum unit, introducing waste gas generated by conversion into a waste gas treatment system, discharging after the waste gas reaches the standard after treatment, and recycling the organic solvent through a solvent recoverer;

fourthly, separating and converting the liquid separated by the solid-liquid separation system and the gas-liquid conversion system into sewage and an organic solvent, separating the sewage and the organic solvent by a liquid-liquid separator, recycling the organic solvent by a solvent recoverer, and discharging the sewage after the sewage enters a sewage treatment station to be treated and reach the standard;

fifthly, putting the dried waste paint slag of the solid-liquid separation system into a cooling bin, wherein the cooling bin utilizes the heat conduction principle to treat and discharge the gas volatilized by the cooling bin or send the gas to a waste gas treatment system;

and finally, performing outsourcing treatment on the dried waste paint slag.

2. The equipment for realizing the waste paint slag reduction drying process method of claim 1 is characterized by comprising the following steps: the system comprises a solid-liquid separation system, a liquid-liquid separator, a gas-liquid conversion system, a cooling bin, a solvent recoverer and a waste gas treatment system; the solid-liquid separation system comprises a drying box and a heat conduction oil tank, wherein heat conduction oil is heated by the heat conduction oil tank and then pumped into the drying box to heat materials; the gas-liquid conversion system includes: the system comprises a condensing device, a cache device, a water tank device, a refrigerating unit and a vacuum unit; the condensing device is respectively connected with the cache device, the refrigerating unit and the vacuum unit; the vacuum unit is connected with the water tank device.

3. The waste paint slag reduction drying device as claimed in claim 2, wherein a drying rack pipe is arranged in the drying box and used for processing materials in the heat insulation process; the heat conduction oil tank comprises a plurality of electric heating pipes for heating heat conduction oil and providing a heat source for the drying tank.

4. The waste paint slag reduction drying equipment as claimed in claim 3, wherein the bottom of the drying box is provided with a sewage discharge unit for discharging liquid impurities.

5. The waste paint slag reduction drying equipment as claimed in claim 4, wherein the sewage discharge unit comprises a sewage discharge groove and a sewage discharge hopper, the sewage discharge groove is a bilaterally symmetrical slope-shaped groove, and a pipeline is connected to the lower end of the slope-shaped groove to form the sewage discharge hopper.

6. The waste paint slag reducing and drying equipment as claimed in claim 3 or 5, wherein a tray filled with materials is placed on the drying rack pipe, and a polytetrafluoroethylene coating is coated on the tray.

7. The waste paint slag reducing and drying equipment as claimed in claim 6, wherein the thickness of the coating film is 0.3-1 mm.

8. The waste paint slag reduction drying device as claimed in claim 7, wherein the drying box further comprises a detection unit for collecting and displaying data in the drying box.

9. The waste paint slag reduction drying device as claimed in claim 8, wherein the drying box further comprises a control unit for setting and controlling various parameters of the drying box.

10. The waste paint slag reduction drying device as claimed in claim 9, wherein a heat insulating layer is arranged between the drying box body and the outer shell.

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