Waste liquid treatment equipment

Abstract

The utility model provides waste liquid treatment equipment which is characterized in that an evaporation device is provided with a waste liquid inlet, a thermal medium inlet, a thermal medium backflow outlet, a vapor fraction outlet and a high-boiling-point pollutant liquid outlet. The waste liquid inlet is communicated with a waste liquid storage tank. And the high-boiling-point pollutant liquid storage tank is communicated with the high-boiling-point pollutant liquid outlet. The condenser is provided with a condensed gas inlet and a condensed liquid outlet, and the condensed gas inlet is communicated with the vapor fraction outlet. The rectification device is provided with a rectification liquid inlet, a thermal medium backflow inlet, a volatile organic compound outlet and a purification liquid outlet. The rectified liquid inlet is communicated with the condensed liquid outlet, the volatile organic compound outlet is communicated with the thermal medium inlet, and the thermal medium backflow inlet is communicated with the thermal medium backflow outlet. And the purified liquid storage tank is communicated with the purified liquid outlet. An impurity branch pipeline is separated from a pipeline connecting the thermal medium backflow outlet and the thermal medium backflow inlet, and the impurity branch pipeline is communicated to a high-boiling-point pollutant liquid storage tank.

Description

Technical Field

[0001] The invention relates to the technical field of industrial waste liquid treatment. Background Art

[0002] In the process of industrial production, especially in the fields of chemical industry and pharmaceutical industry, a large amount of waste liquid containing high salt and high chemical oxygen demand (COD) is often generated. If such waste liquid is discharged directly without proper treatment, it will cause serious pollution to the environment. Therefore, it is necessary to adopt effective treatment technology to treat it. In the prior art, a process combining evaporation and distillation is provided for the treatment of high-salt and high-COD waste liquid. Evaporation can effectively remove water from the waste liquid, and the distillation process can further separate and purify the organic matter therein, thereby reducing the volume of waste liquid, reducing treatment costs and realizing resource recovery.

[0003] However, in the waste liquid treatment equipment provided in the prior art, impurities are easily introduced into the distillation tower and accumulated in the tower, resulting in a decrease in the operating performance of the distillation tower, shortening the service life of the distillation tower, and increasing equipment maintenance costs and downtime. Summary of the Invention

[0004] The utility model aims to provide a waste liquid treatment device so as to at least solve or alleviate some of the problems existing in the prior art.

[0005] The utility model provides a waste liquid treatment device, comprising: a waste liquid storage tank, an evaporation device, a high-boiling-point pollutant liquid storage tank, a condenser, a distillation device, and a purified liquid storage tank. The evaporation device has a waste liquid inlet, a heat medium inlet, a heat medium reflux outlet, a vapor fraction outlet, and a high-boiling-point pollutant liquid outlet. The waste liquid inlet is connected to the waste liquid storage tank. The high-boiling-point pollutant liquid storage tank is connected to the high-boiling-point pollutant liquid outlet. The condenser has a condensed gas inlet and a condensed liquid outlet, and the condensed gas inlet is connected to the vapor fraction outlet. The distillation device has a distillation liquid inlet, a heat medium reflux inlet, a volatile organic compound outlet, and a purified liquid outlet. The distillation liquid inlet is connected to the condensed liquid outlet, the volatile organic compound outlet is connected to the heat medium inlet, and the heat medium reflux inlet is connected to the heat medium reflux outlet. The purified liquid storage tank is connected to the purified liquid outlet. An impurity branch pipeline is branched from the pipeline connecting the heat medium reflux outlet and the heat medium reflux inlet, and the impurity branch pipeline is connected to the high-boiling-point pollutant liquid storage tank.

[0006] According to the waste liquid treatment equipment provided by the utility model, the volatile organic matter separated in the distillation device is extracted from the distillation device. On the one hand, it can be supplied to the evaporation device as a heat source. On the other hand, it is convenient to use the external impurity branch pipeline to remove impurities in the distillation device to a certain extent, thereby improving the operating performance of the distillation device and increasing the service life of the distillation device.

[0007] In the waste liquid treatment equipment of an optional technical solution of the present invention, the evaporation device includes: a first evaporator, a first absorber, a second evaporator, and a second absorber. The waste liquid inlet, heat medium inlet, and heat medium reflux outlet are all provided in the first evaporator. The gas outlet of the first evaporator is connected to the gas inlet of the first absorber. The liquid outlet of the first evaporator is connected to the liquid inlet of the second evaporator, the liquid outlet for high-boiling-point contaminants is provided in the second evaporator, and the gas outlet of the first absorber is connected to the gas inlet of the second evaporator. The gas outlet of the second evaporator is connected to the gas inlet of the second absorber, and the vapor fraction outlet is provided in the second absorber.

[0008] According to the above preferred technical solution, by providing the first evaporator, the first absorber, the second evaporator and the second absorber, it is beneficial to improve the waste liquid concentration ratio and can basically ensure that the purified liquid discharge meets the standards.

[0009] In the waste liquid treatment equipment of an optional technical solution of the present invention, the evaporation device includes: a first evaporator and a second evaporator. The waste liquid inlet, heat medium inlet, and heat medium reflux outlet are all provided in the first evaporator. The liquid inlet of the second evaporator is connected to the liquid outlet of the first evaporator, and the gas inlet of the second evaporator is connected to the gas outlet of the first evaporator. The vapor fraction outlet and the high-boiling-point contaminant liquid outlet are provided in the second evaporator.

[0010] In the waste liquid treatment equipment of an optional technical solution of the present invention, the evaporation device includes: a first evaporator, a second evaporator, and an absorber. The waste liquid inlet, heat medium inlet, and heat medium reflux outlet are all provided in the first evaporator. The liquid inlet of the second evaporator is connected to the liquid outlet of the first evaporator, and the high-boiling-point contaminant liquid outlet is provided in the second evaporator. The first gas inlet of the absorber is connected to the gas outlet of the first evaporator, the second gas inlet of the absorber is connected to the gas outlet of the second evaporator, and the vapor fraction outlet is provided in the absorber.

[0011] In the waste liquid treatment equipment of an optional technical solution of the present invention, at least one of the first evaporator and the second evaporator includes a separator tank, a heat exchange component, and a liquid circulation component. The liquid circulation component includes a circulation pipeline and a circulation pump. The circulation pipeline connects the separator tank and the heat exchange component, and the circulation pump is disposed in the circulation pipeline.

[0012] According to the preferred technical solution, the liquid in the separation tank is drawn out by the liquid circulation component, then raised in temperature by the heat exchange component before being returned to the separation tank. The heated liquid returns to the separation tank and mixes with the liquid in the separation tank, improving thermal efficiency. Furthermore, the continuous circulation of the liquid in the separation tank effectively prevents the formation of scale in the separation tank.

[0013] The waste liquid treatment equipment of the optional technical solution of the present invention further includes an alkaline absorbent supply pipeline. At least one of the first absorber and the second absorber has an absorbent inlet, and the alkaline absorbent supply pipeline is connected to the absorbent inlet of the first absorber and / or the absorbent inlet of the second absorber.

[0014] According to the above preferred technical solution, alkaline absorbents such as caustic soda can be fed into the first absorber and / or the second absorber from outside the equipment through the alkaline absorbent supply pipeline, which is beneficial to improving the absorption efficiency of the first absorber and / or the second absorber.

[0015] The waste liquid treatment equipment of the optional technical solution of the present invention further comprises an alkaline absorbent supply pipeline. The absorber has at least one absorbent inlet, and the alkaline absorbent supply pipeline is connected to the absorbent inlet of the absorber.

[0016] According to the above preferred technical solution, alkaline absorbent such as caustic soda can be fed into the absorber from outside the equipment through the alkaline absorbent supply pipeline, which is beneficial to improving the absorption efficiency of the absorber.

[0017] The waste liquid treatment equipment of the optional technical solution of the present invention further includes an intermediate tank, the distillation liquid inlet and the condensed liquid outlet are connected via the intermediate tank, and the second evaporator is connected to the distillation device via the intermediate tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a waste liquid treatment device according to an embodiment of the present invention is shown.

[0019] Figure 2 A schematic diagram of a waste liquid treatment device according to Example 1 of the present utility model is shown.

[0020] Figure 3 A schematic diagram of a waste liquid treatment device according to Example 2 of the present utility model is shown.

[0021] Figure 4 A schematic diagram of a waste liquid treatment device according to Example 3 of the present utility model is shown.

[0022] Reference numerals:

[0023] Waste liquid treatment equipment 100, waste liquid storage tank 1, evaporation device 2, waste liquid inlet 21, heat medium inlet 22, heat medium reflux outlet 23, vapor fraction outlet 24, high boiling point pollutant liquid outlet 25, high boiling point pollutant liquid storage tank 52, condenser 3, condensed gas inlet 31, condensed liquid outlet 32, distillation device 4, distillation liquid inlet 41, heat medium reflux inlet 42, volatile organic compound outlet 43, purified liquid outlet 44, purified liquid storage tank 51, intermediate tank 53, impurity branch line 10;

[0024] <Example 1>

[0025] First evaporator 106, gas outlet 61a of the first evaporator, liquid outlet 62a of the first evaporator, separator 65a, heat exchange component 66a, liquid circulation component 67a, circulation pipeline 671a, circulation pump 672a, second evaporator 107, liquid inlet 71a of the second evaporator, gas inlet 72a of the second evaporator, gas outlet 73a of the second evaporator, separator 75a, heat exchange component 76a, liquid circulation component 77a, circulation pipeline 771a, circulation pump 772a, first absorber 108, gas inlet 81a of the first absorber, gas outlet 82a of the first absorber, absorbent inlet 83a, second absorber 109, gas inlet 91a of the second absorber, absorbent inlet 93a, alkaline absorbent supply pipeline 90a;

[0026] <Example 2>

[0027] First evaporator 206, liquid outlet 62b of the first evaporator, gas outlet 61b of the first evaporator, separator 65b, heat exchange component 66b, liquid circulation component 67b, circulation pipeline 671b, circulation pump 672b, second evaporator 207, liquid inlet 71b of the second evaporator, gas inlet 72b of the second evaporator, separator 75b, heat exchange component 76b, liquid circulation component 77b, circulation pipeline 771b, circulation pump 772b;

[0028] <Example 3>

[0029] First evaporator 306, liquid outlet 62c of first evaporator, gas outlet 61c of first evaporator, second evaporator 307, liquid inlet 71c of second evaporator, gas outlet 73c of second evaporator, absorber 309, first gas inlet 911c, second gas inlet 912c, absorbent inlet 93c, alkaline absorbent supply pipeline 90c. DETAILED DESCRIPTION

[0030] It should be noted that the working principle, characteristics and advantages of the waste liquid treatment equipment according to the present invention will be explained below in an illustrative manner, but it should be understood that all descriptions are given for illustration purposes only and should not be understood as forming any limitation on the present invention.

[0031] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature shown or implied in the accompanying drawings, the present invention still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, thereby obtaining more other embodiments of the present invention that may not be directly mentioned in this document.

[0032] Figure 1 This is a schematic diagram of the structure of the waste liquid treatment equipment 100 provided in this embodiment, refer to Figure 1 The waste liquid treatment equipment 100 provided in this embodiment includes: a waste liquid storage tank 1, an evaporation device 2, a high boiling point pollutant liquid storage tank 52, a condenser 3, a distillation device 4 and a purified liquid storage tank 51.

[0033] Evaporation device 2 has a waste liquid inlet 21, a heat medium inlet 22, a heat medium reflux outlet 23, a vapor fraction outlet 24, and a high-boiling-point contaminant liquid outlet 25. Waste liquid inlet 21 is connected to waste liquid storage tank 1. High-boiling-point contaminant liquid storage tank 52 is connected to high-boiling-point contaminant liquid outlet 25. Condenser 3 has a condensed gas inlet 31 and a condensed liquid outlet 32. Condensed gas inlet 31 is connected to vapor fraction outlet 24.

[0034] The distillation unit 4 has a distillation liquid inlet 41, a heat medium return inlet 42, a volatile organic compound outlet 43, and a purified liquid outlet 44. The distillation liquid inlet 41 is connected to the condensed liquid outlet 32, the volatile organic compound outlet 43 is connected to the heat medium inlet 22, and the heat medium return inlet 42 is connected to the heat medium return outlet 23. The purified liquid storage tank 51 is connected to the purified liquid outlet 44.

[0035] An impurity branch line 10 is branched from the pipeline connecting the heat medium return outlet 23 and the heat medium return inlet 42 , and the impurity branch line 10 is connected to the high-boiling-point contaminant liquid storage tank 52 .

[0036] It should be noted that the “connectivity” mentioned above refers to the use of pipes, valves, storage tanks and other components to transport materials from one place to another without undergoing large-scale phase change.

[0037] The following describes the operating principle of the waste liquid treatment equipment 100 provided in this embodiment. Waste liquid in the waste liquid storage tank 1, such as high-salt, high-COD waste liquid, is fed into the evaporation device 2 for evaporation and separation. In the evaporation device 2, liquid (i.e., volatile contaminant liquid) exits the high-boiling-point contaminant liquid outlet 25 and is fed into the high-boiling-point contaminant liquid storage tank 52, while vapor exits the vapor-like fraction outlet 24 and is fed into the condenser 3. The vapor exiting the vapor-like fraction outlet 24 is condensed and then fed into the distillation device 4. In the distillation device 4, liquid exits the purified liquid outlet 44 and is fed into the purified liquid storage tank 51, while vapor (i.e., volatile organic compounds) exits the volatile organic compound outlet 43. The volatile organic compounds exiting the distillation device 4 are supplied as a heat source to the heat medium inlet 22 of the evaporation device 2. After heat exchange in the evaporation device 2, the volatile organic compounds exit the evaporation device 2 through the heat medium reflux outlet 23. After impurities such as particulate matter are removed, the volatile organic compounds return to the distillation device 4 through the heat medium reflux inlet 42. The impurities are sent to the high boiling point pollutant liquid storage tank 52 through the impurity branch line 10. The liquid in the volatile pollutant liquid storage tank 52 can be sent to an incineration chamber (not shown) for incineration.

[0038] According to the waste liquid treatment equipment 100 provided in this embodiment, the volatile organic matter separated in the distillation device 4 is extracted from the distillation device 4. On the one hand, it can be supplied to the evaporation device 2 as a heat source. On the other hand, the impurities in the distillation device 4 can be removed to a certain extent by using the external impurity branch pipeline 10, thereby improving the operating performance of the distillation device 4 and increasing the service life of the distillation device 4.

[0039] The ratio of the amount extracted from the impurity branch line 10 to the amount returned to the distillation unit 4 has an upper limit of 1:4. If the amount extracted from the impurity branch line 10 exceeds this upper limit, the refining efficiency of the distillation unit 4 will decrease, and the amount of impurities contained in the condensate in the high-boiling-point contaminant liquid storage tank 52 will increase, thereby increasing the load on the final treatment equipment (such as the incinerator) in the subsequent stage. Specifically, for example, the actual impurity content in the final treatment equipment in the subsequent stage exceeds the treatable impurity content, resulting in the need for additional treatment before the final treatment equipment or an increase in the energy required by the final treatment equipment. The ratio of the amount extracted from the impurity branch line 10 to the amount directly returned to the distillation unit 4 has a lower limit of 0:100. This lower limit ratio is mainly used in situations such as at the beginning of operation. At this time, all substances leaving the heat medium reflux outlet 23 are returned to the distillation unit 4, and no substances are extracted from the impurity branch line 10.

[0040] It is understood that any device capable of separating waste liquid into a high-boiling-point contaminant liquid and a vapor fraction is within the technical scope of the evaporation device 2 described in this utility model. The following will introduce the waste liquid treatment equipment 100 in this embodiment by combining three examples of the specific structure of the evaporation device 2.

[0041] <Example 1>

[0042] Figure 2 The specific structure of the evaporation device 2 provided in Example 1 and the waste liquid treatment equipment 100 having the evaporation device 2 are shown.

[0043] refer to Figure 2 The evaporation device 2 includes: a first evaporator 106, a first absorber 108, a second evaporator 107 and a second absorber 109. The waste liquid inlet 21, the heat medium inlet 22 and the heat medium reflux outlet 23 are all provided in the first evaporator 106.

[0044] The gas outlet 61a of the first evaporator is connected to the gas inlet 81a of the first absorber. The gas outlet 82a of the first absorber is connected to the gas inlet 72a of the second evaporator. The gas outlet 73a of the second evaporator is connected to the gas inlet 91a of the second absorber. The vaporous fraction outlet 24 is provided in the second absorber 109.

[0045] The liquid outlet 62 a of the first evaporator is in communication with the liquid inlet 71 a of the second evaporator, and the high-boiling-point pollutant liquid outlet 25 is provided in the second evaporator 107 .

[0046] In this embodiment, the waste liquid in the waste liquid storage tank 1 is sent to the first evaporator 106 for separation. In the first evaporator 106, the vapor is sent to the first absorber 108 to remove any heavy components that may be present in the vapor using the absorption liquid in the first absorber 108. The liquid is then sent to the second evaporator 107 for secondary evaporation and separation. The vapor leaving the first absorber 108 is sent to the second evaporator 107. In the second evaporator 107, the vapor is sent to the second absorber 109, and the liquid leaves through the high-boiling-point contaminant liquid outlet 25 and is sent to the high-boiling-point contaminant liquid storage tank 52. The vapor in the second absorber 109 leaves through the vapor fraction outlet 24 and is sent to the condenser 3. The liquid leaving through the condensed liquid outlet 32 ​​is first sent to the intermediate tank 53 and then to the distillation unit 4.

[0047] Volatile organic matter leaving the distillation unit 4 is supplied as a heat source to the heat medium inlet 22 of the first evaporator 106. After heat exchange within the first evaporator 106, it leaves the first evaporator 106 through the heat medium return outlet 23. After impurities such as particulate matter are removed, it returns to the distillation unit 4 through the heat medium return inlet 42. These impurities are then delivered to the high-boiling-point contaminant liquid storage tank 52 via the impurity branch line 10.

[0048] In some embodiments, the volatile organic compounds serving as a heat source are sent to the second evaporator 107 for heat exchange after heat exchange in the first evaporator 106 , and then returned to the distillation device 4 via the intermediate tank 53 .

[0049] It is understood that the first evaporator 106 can be configured to have a shell side and a tube side, with the waste liquid and the volatile organic compounds as a heat source either passing through the shell side and the other passing through the tube side. The second evaporator 107 has a similar structure to the first evaporator 106 and will not be described in detail.

[0050] In this embodiment, the first evaporator 106 includes a separator 65a, a heat exchange component 66a, and a liquid circulation component 67a. The liquid circulation component 67a includes a circulation pipeline 671a and a circulation pump 672a. The circulation pipeline 671a connects the separator 65a and the heat exchange component 66a. The circulation pump 672a is provided in the circulation pipeline 671a.

[0051] The second evaporator 107 includes a separator 75a, a heat exchange component 76a, and a liquid circulation component 77a. The liquid circulation component 77a includes a circulation line 771a and a circulation pump 772a. The circulation line 771a connects the separator 75a and the heat exchange component 76a. The circulation pump 772a is provided in the circulation line 771a.

[0052] After the liquid is drawn from the separator tanks 65a and 75a via the liquid circulation components 67a and 77a, the liquid's temperature is raised by the heat exchange components 66a and 76a before being returned to the separator tanks 65a and 75a. The heated liquid in the heat exchange components 66a and 76a returns to the separator tanks and mixes with the liquid in the separator tanks 65a and 75a, improving thermal efficiency. Furthermore, the continuous circulation of the liquid in the separator tanks 65a and 75a effectively prevents the formation of scale within the separator tanks 65a and 75a.

[0053] Although in the present embodiment, the first evaporator 106 and the second evaporator 107 have similar structures, in other embodiments, the structures of the first evaporator 106 and the second evaporator 107 may be designed separately according to their respective operating characteristics.

[0054] In this embodiment, the waste liquid treatment equipment 100 includes an alkaline absorbent supply line 90a. The first absorber 108 has an absorbent inlet 83a, and the second absorber 109 has an absorbent inlet 93a. The alkaline absorbent supply line 90a is connected to the absorbent inlet 83a of the first absorber 108 and the absorbent inlet 93a of the second absorber 109.

[0055] Alkaline absorbent supply line 90 a may be used to feed alkaline absorbent such as caustic soda into the first absorber 108 and the second absorber 109 from outside the device, thereby improving the absorption efficiency of the first absorber 108 and the second absorber 109 .

[0056] Although in the present embodiment, the first absorber 108 and the second absorber 109 are respectively provided with absorbent inlets 83a and 93a, in other embodiments, the first absorber 108 and the second absorber 109 may be connected, in which case the absorbent inlet 83a may be provided only on the first absorber 108, or the absorbent inlet 93a may be provided only on the second absorber 109.

[0057] <Example 2>

[0058] Figure 3 The specific structure of the evaporation device 2 provided in Example 2 and the waste liquid treatment equipment 100 having the evaporation device 2 are shown.

[0059] refer to Figure 3 The evaporation device 2 includes a first evaporator 206 and a second evaporator 207. The waste liquid inlet 21, the heat medium inlet 22, and the heat medium reflux outlet 23 are all provided in the first evaporator 206. The liquid inlet 71b of the second evaporator is connected to the liquid outlet 62b of the first evaporator, the gas inlet 72b of the second evaporator is connected to the gas outlet 61b of the first evaporator, and the vapor fraction outlet 24 and the high-boiling-point contaminant liquid outlet 25 are provided in the second evaporator 207.

[0060] Although in this embodiment, the evaporation device 2 includes the first evaporator 206 and the second evaporator 207 , in other embodiments, only one evaporator or more than two evaporators may be provided.

[0061] In this embodiment, the waste liquid in the waste liquid storage tank 1 is sequentially fed into the first evaporator 206 and the second evaporator 207 for separation. In the second evaporator 207, the liquid exits through the high-boiling-point contaminant liquid outlet 25 and is fed into the high-boiling-point contaminant liquid storage tank 52, while the vapor exits through the vapor-like fraction outlet 24 and is fed into the condenser 3. The liquid exiting the condensed liquid outlet 32 ​​is first fed into the intermediate tank 53 and then into the rectification unit 4.

[0062] Volatile organic matter leaving the distillation unit 4 is supplied as a heat source to the heat medium inlet 22 of the first evaporator 206. After heat exchange within the first evaporator 206, it leaves the first evaporator 206 through the heat medium return outlet 23. After impurities such as particulate matter are removed, it returns to the distillation unit 4 through the heat medium return inlet 42. These impurities are then delivered to the high-boiling-point contaminant liquid storage tank 52 via the impurity branch line 10.

[0063] In this embodiment, the first evaporator 206 includes a separator 65b, a heat exchange component 66b, and a liquid circulation component 67b. The liquid circulation component 67b includes a circulation pipeline 671b and a circulation pump 672b. The circulation pipeline 671b connects the separator 65b and the heat exchange component 66b. The circulation pump 672b is provided in the circulation pipeline 671b.

[0064] The second evaporator 207 includes a separator 75b, a heat exchange component 76b, and a liquid circulation component 77b. The liquid circulation component 77b includes a circulation line 771b and a circulation pump 772b. The circulation line 771b connects the separator 75b and the heat exchange component 76b. The circulation pump 772b is provided in the circulation line 771b.

[0065] <Example 3>

[0066] Figure 4 The specific structure of the evaporation device 2 provided in Example 3 and the waste liquid treatment equipment 100 having the evaporation device 2 are shown.

[0067] refer to Figure 4 The evaporation device 2 includes a first evaporator 306, a second evaporator 307, and an absorber 309. The waste liquid inlet 21, the heat medium inlet 22, and the heat medium reflux outlet 23 are all provided in the first evaporator 306. The liquid inlet 71c of the second evaporator is connected to the liquid outlet 62c of the first evaporator, and the high-boiling-point contaminant liquid outlet 25 is provided in the second evaporator 307. The first gas inlet 911c of the absorber 309 is connected to the gas outlet 61c of the first evaporator, the second gas inlet 912c of the absorber 309 is connected to the gas outlet 73c of the second evaporator, and the vapor fraction outlet 24 is provided in the absorber 309.

[0068] In this embodiment, the waste liquid in the waste liquid storage tank 1 is fed into the first evaporator 306 for separation. In the first evaporator 306, the vapor is fed into the absorber 309, and the liquid is fed into the second evaporator 307 for secondary evaporation and separation. In the second evaporator 307, the vapor is fed into the absorber 309, and the liquid exits through the high-boiling-point contaminant liquid outlet 25 and is fed into the high-boiling-point contaminant liquid storage tank 52. The vapor in the absorber 309 exits through the vapor-like fraction outlet 24 and is fed into the condenser 3. The liquid exiting the condensed liquid outlet 32 ​​is first fed into the intermediate tank 53 and then into the rectification unit 4.

[0069] Volatile organic matter leaving the distillation unit 4 is supplied as a heat source to the heat medium inlet 22 of the first evaporator 306. After heat exchange within the first evaporator 306, it leaves the first evaporator 306 through the heat medium return outlet 23. After impurities such as particulate matter are removed, it returns to the distillation unit 4 through the heat medium return inlet 42. These impurities are then delivered to the high-boiling-point contaminant liquid storage tank 52 via the impurity branch line 10.

[0070] Although in this embodiment, the absorbed steam in the absorber 309 is directly sent to the condenser 3, in other embodiments, the absorber 309 may include two sub-absorbers, and the absorbed steam in one of the sub-absorbers can be returned to the first evaporator 306 again to achieve heat circulation.

[0071] In this embodiment, the waste liquid treatment equipment 100 includes an alkaline absorbent supply line 90c. The absorber 309 has an absorbent inlet 93c, and the alkaline absorbent supply line 90c is connected to the absorbent inlet 93c.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A waste liquid treatment device comprising: Waste liquid storage tanks; an evaporation device having a waste liquid inlet, a heat medium inlet, a heat medium reflux outlet, a vapor fraction outlet, and a high-boiling-point pollutant liquid outlet, wherein the waste liquid inlet is connected to the waste liquid storage tank; a high-boiling-point pollutant liquid storage tank, connected to the high-boiling-point pollutant liquid outlet; a condenser having a condensed gas inlet and a condensed liquid outlet, wherein the condensed gas inlet is in communication with the vaporous fraction outlet; a distillation device having a distillation liquid inlet, a heat medium reflux inlet, a volatile organic compound outlet, and a purified liquid outlet, wherein the distillation liquid inlet is connected to the condensed liquid outlet, the volatile organic compound outlet is connected to the heat medium inlet, and the heat medium reflux inlet is connected to the heat medium reflux outlet; a purified liquid storage tank, connected to the purified liquid outlet; It is characterized by: An impurity branch pipeline is branched off from the pipeline connecting the heat medium reflux outlet and the heat medium reflux inlet, and the impurity branch pipeline is connected to the high-boiling-point pollutant liquid storage tank.

2. The waste liquid treatment equipment according to claim 1, characterized in that: The evaporation device comprises: a first evaporator, wherein the waste liquid inlet, the heat medium inlet, and the heat medium reflux outlet are all provided on the first evaporator; a first absorber, wherein the gas outlet of the first evaporator is in communication with the gas inlet of the first absorber; a second evaporator, wherein the liquid outlet of the first evaporator is connected to the liquid inlet of the second evaporator, the high-boiling-point pollutant liquid outlet is provided at the second evaporator, and the gas outlet of the first absorber is connected to the gas inlet of the second evaporator; The second absorber has a gas outlet of the second evaporator connected to a gas inlet of the second absorber, and a vapor fraction outlet is provided in the second absorber.

3. The waste liquid treatment equipment according to claim 1, characterized in that: The evaporation device comprises: a first evaporator, wherein the waste liquid inlet, the heat medium inlet, and the heat medium reflux outlet are all provided on the first evaporator; The second evaporator has a liquid inlet connected to the liquid outlet of the first evaporator, a gas inlet connected to the gas outlet of the first evaporator, and the vapor fraction outlet and the high-boiling-point pollutant liquid outlet are provided in the second evaporator.

4. The waste liquid treatment equipment according to claim 1, characterized in that: The evaporation device comprises: a first evaporator, wherein the waste liquid inlet, the heat medium inlet, and the heat medium reflux outlet are all provided on the first evaporator; a second evaporator, wherein the liquid inlet of the second evaporator is connected to the liquid outlet of the first evaporator, and the high-boiling-point pollutant liquid outlet is provided at the second evaporator; An absorber, wherein a first gas inlet of the absorber is communicated with a gas outlet of the first evaporator, a second gas inlet of the absorber is communicated with a gas outlet of the second evaporator, and the vaporous fraction outlet is provided in the absorber.

5. The waste liquid treatment equipment according to any one of claims 2 to 4, characterized in that: At least one of the first evaporator and the second evaporator has a separation tank, a heat exchange component, and a liquid circulation component. The liquid circulation component includes a circulation pipeline and a circulation pump. The circulation pipeline is connected with the separation tank and the heat exchange component. The circulation pump is arranged in the circulation pipeline.

6. The waste liquid treatment equipment according to claim 2, characterized in that: Also includes: Alkaline absorbent supply line; At least one of the first absorber and the second absorber has an absorbent inlet, and the alkaline absorbent supply line is connected to the absorbent inlet of the first absorber and / or the absorbent inlet of the second absorber.

7. The waste liquid treatment equipment according to claim 4, characterized in that: Also includes: Alkaline absorbent supply line; The absorber has at least one absorbent inlet, and the alkaline absorbent supply line is connected to the absorbent inlet of the absorber.

8. The waste liquid treatment equipment according to any one of claims 2 to 4, characterized in that: Also includes: An intermediate tank, the distillation liquid inlet and the condensed liquid outlet are connected via the intermediate tank, and the second evaporator and the distillation device are connected via the intermediate tank.

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