Black water treatment device

Abstract

The utility model relates to a black water treatment device. The black water treatment device comprises a flash evaporation assembly, more than two heat exchange structures, a filtering structure and a power system, the flash evaporation assembly comprises n stages of flash evaporators, each stage of flash evaporator comprises a liquid phase inlet, a liquid phase outlet and a gas phase outlet, in every two adjacent stages of flash evaporators, the liquid phase outlet of the previous stage of flash evaporator is communicated with the liquid phase inlet of the next stage of flash evaporator, and black water can enter from the liquid phase inlet of the first stage of flash evaporator and sequentially pass through all stages of flash evaporators; the liquid phase is discharged from a liquid phase outlet of the nth-stage flash evaporator, and n is greater than or equal to 2. The heat exchange structures and the flash evaporators are arranged one to one. A filtering structure is arranged in each stage of flash evaporator, and is arranged between the liquid phase inlet and the gas phase outlet in the height direction of the flash evaporator. The power system is connected to the heat exchange structures and is configured to drive gas in the flash evaporators to enter the heat exchange structures so as to exchange heat with substances of the heat exchange structures. According to the embodiment of the invention, the scaling and blocking problems can be prevented.

Description

Technical Field

[0001] The utility model relates to the field of black water treatment, in particular to a black water treatment device. Background Art

[0002] Black water refers to washing water that is black due to the unreacted carbon and ash. Black water usually has a certain pressure and high temperature. The treatment method for black water is usually to first cool down and reduce the pressure of the black water, then enter the sedimentation tank for solid-liquid separation, and the separated ash water is then cooled by the cooler and finally discharged to the sewage treatment facility.

[0003] Because the temperature of the black water is relatively high before it enters the sedimentation tank, the solid-liquid separation effect is poor, so the gray water passing through the cooler still contains more carbon and ash, which makes the cooler prone to scaling and clogging. Utility Model Content

[0004] The embodiment of the present application provides a black water treatment device, which helps to prevent scaling and clogging problems.

[0005] On the one hand, according to an embodiment of the present application, a black water treatment device is proposed, including: a flash evaporation assembly, including n-stage flash evaporators, each stage of the flash evaporator includes a liquid phase inlet, a liquid phase outlet and a gas phase outlet, in two adjacent flash evaporators, the liquid phase outlet of the upper flash evaporator is connected to the liquid phase inlet of the lower flash evaporator, black water can enter from the liquid phase inlet of the first flash evaporator and pass through the flash evaporators of each stage in sequence, and be discharged from the liquid phase outlet of the n-stage flash evaporator, n≥2; more than two heat exchange structures, the heat exchange structures are arranged one-to-one with the flash evaporators, and each heat exchange structure is connected to the gas phase outlet of the flash evaporators of each stage; a filtering structure, a filtering structure is arranged in each flash evaporator, and in the height direction of the flash evaporator, the filtering structure is arranged between the liquid phase inlet and the gas phase outlet; a power system, connected to the heat exchange structure, the power system is configured to drive the gas in the flash evaporators of each stage to enter each heat exchange structure through the gas phase outlet to exchange heat with the material of the heat exchange structure.

[0006] According to one aspect of the embodiment of the present application, the filtering structure is detachably connected to the flash evaporator.

[0007] According to one aspect of the embodiment of the present application, the flash evaporator is filled with fillers, and the filtering structure is supported by the fillers and is disposed in contact with the inner wall of the flash evaporator.

[0008] According to one aspect of an embodiment of the present application, one of the heat exchange structures is a desalted water heat exchanger, and the gas entering the desalted water heat exchanger from the gas phase outlet of the flash evaporator can heat the material in the desalted water heat exchanger to between 40°C and 65°C.

[0009] According to one aspect of an embodiment of the present application, the n-th stage flash evaporator further includes a liquid inlet connected to the power system so that the condensate in the power system enters the n-th stage flash evaporator through the liquid inlet.

[0010] According to one aspect of the embodiment of the present application, in the height direction, the flash evaporators of each stage are arranged in sequence along the height direction, and the height dimension of the first stage flash evaporator is greater than the height dimension of the nth stage flash evaporator.

[0011] According to one aspect of an embodiment of the present application, n-stage flash evaporators are integrated and arranged, the flash assembly includes a shell, the shell includes a wall portion, the wall portion encloses n cavities, the n cavities are arranged in sequence along the height direction, and one cavity is set as a first-stage flash evaporator.

[0012] According to one aspect of an embodiment of the present application, the black water treatment device further includes a regulating valve, and a regulating valve is provided between the power system and each heat exchange structure, and the regulating valve is configured to control the flow of gas entering the heat exchange structure through the gas phase outlet.

[0013] According to one aspect of an embodiment of the present application, the black water treatment device further includes a pressure gauge, which is disposed between each stage of the flash evaporator and the heat exchange structure, and is configured to detect a pressure value in the flash evaporator.

[0014] According to one aspect of an embodiment of the present application, the black water treatment device also includes a pre-cooling assembly, which is arranged upstream of the flash evaporation assembly. The black water can enter the flash evaporation assembly through the pre-cooling assembly. The pre-cooling assembly is configured to cool the black water to a first temperature, and the flash evaporation assembly is configured to cool the black water at the first temperature to a second temperature lower than the first temperature.

[0015] The black water treatment device provided in the embodiment of the present application includes a flash evaporation assembly, two or more heat exchange structures, a filtering structure and a power system. The flash evaporation assembly includes n-stage flash evaporators, each stage of the flash evaporator is provided with a filtering structure, and each stage of the flash evaporator is correspondingly provided with a heat exchange structure. The black water is discharged after flash evaporation through the n-stage flash evaporators, and the gas formed after the black water is flashed is driven by the power system into the heat exchange structure to exchange heat with the material in the heat exchange structure. By providing a filtering structure in the flash evaporator, the gas can enter the heat exchange structure after being filtered by the filtering structure. The filtering structure can separate the solid particles entrained in the gas to ensure the cleanliness of the gas, avoid a large number of solid particles from gathering in the heat exchange structure, and help prevent the heat exchange structure from scaling and clogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] Figure 1 This is a connection diagram of a black water treatment device according to an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the partial structure of a black water treatment device according to an embodiment of the present application.

[0019] in:

[0020] 10-flash evaporation assembly; 11-first stage flash evaporator; 12-second stage flash evaporator; 1011-wall; 1012-cavity;

[0021] 20-heat exchange structure; 30-filter structure; 40-power system; 50-regulating valve; 60-pressure gauge;

[0022] X-height direction; DETAILED DESCRIPTION

[0023] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0024] The directional words appearing in the following description are all directions shown in the figure, and do not limit the black water treatment device of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0025] In order to better understand this application, Figure 1 and Figure 2 The black water treatment device according to the application embodiment is described in detail.

[0026] Black water refers to washing water that is black due to the unreacted carbon and ash. Black water is usually high-temperature and high-pressure solid-containing black water from the bottom of the gasifier. Therefore, the treatment method for black water is usually to reduce the temperature of the black water to between 70-85°C by decompression and flash evaporation, and then enter the sedimentation tank for solid-liquid separation. The separated ash water is then cooled to 40-45°C by a cooler and finally discharged to the sewage treatment facility.

[0027] Because the temperature of the black water is relatively high before it enters the sedimentation tank, the solid-liquid separation effect is poor, so the gray water passing through the cooler still contains more carbon and ash, which makes the cooler prone to scaling and clogging.

[0028] Based on the above defects, an embodiment of the present application provides a black water treatment device, which can cool the black water to between 40-45°C and then discharge it into a sedimentation tank for solid-liquid separation. The separated gray water is directly discharged to the sewage treatment facility. In other words, there is no need to set a cooler after the sedimentation tank, which solves the problem of scaling and clogging of the cooler. In addition, by providing a filtering structure in the flash evaporator, the cleanliness of the gas entering the heat exchange structure from the flash evaporator can be ensured, thereby preventing scaling and clogging of the heat exchange structure.

[0029] See also Figure 1 The embodiment of the present application provides a black water treatment device, including a flash assembly 10, two or more heat exchange structures 20, a filter structure 30 and a power system 40. The flash assembly 10 includes n-stage flash evaporators, each stage of the flash evaporator includes a liquid phase inlet, a liquid phase outlet and a gas phase outlet, respectively. In two adjacent flash evaporators, the liquid phase outlet of the upper stage flash evaporator is connected to the liquid phase inlet of the lower stage flash evaporator. Black water can enter from the liquid phase inlet of the first stage flash evaporator 11 and pass through each stage of the flash evaporator in sequence, and be discharged from the liquid phase outlet of the nth stage flash evaporator, n≥2. The heat exchange structure 20 is arranged one-to-one with the flash evaporator, and each heat exchange structure 20 is connected to the gas phase outlet of each stage of the flash evaporator. A filter structure 30 is arranged in each stage of the flash evaporator, and the filter structure 30 is arranged between the liquid phase inlet and the gas phase outlet in the height direction X of the flash evaporator. The power system 40 is connected to the heat exchange structure 20 , and is configured to drive the gas in each flash evaporator to enter each heat exchange structure 20 through a gas phase outlet to exchange heat with the material in the heat exchange structure 20 .

[0030] Black water enters the first-stage flash evaporator 11 through the liquid phase inlet of the first-stage flash evaporator 11, and becomes black water with a lower temperature after being flashed and generates gas. The gas is driven by the power system 40 and filtered through the filter structure 30, then flows out from the gas phase outlet, and enters the heat exchange structure 20 to exchange heat with the material in the heat exchange structure 20. After the black water is flashed through the n-stage flash evaporator, its temperature is successively reduced to an appropriate temperature, and finally discharged from the liquid phase outlet of the n-stage flash evaporator.

[0031] Usually, black water has a certain pressure and a relatively high temperature, wherein the initial temperature of the black water can reach about 220°C and the pressure can reach 4.5MPa. The black water treatment device provided in one embodiment of the present application can directly flash the black water having this temperature and pressure. That is to say, the industrially generated black water can be directly processed by the black water treatment device to reach a temperature and pressure that can be discharged to a sewage treatment facility.

[0032] Of course, the black water treatment device provided in one embodiment of the present application can also be used for black water with a temperature between 70-85°C, that is, for flash evaporation of black water that has been cooled and decompressed. In other words, the black water treatment device provided in an embodiment of the present application can be used in conjunction with a pre-cooling assembly. The industrially generated black water is first treated with the pre-cooling assembly to reduce the temperature of the black water to between 70°C and 85°C, and then treated with the black water treatment device to reach a temperature and pressure that can be discharged to a sewage treatment facility.

[0033] For ease of description, the following description will be based on the black water entering the black water treatment device, with the temperature being between 70° C. and 85° C., but it should be understood that the present application is not limited thereto.

[0034] The flash assembly 10 includes n-stage flash evaporators, where n≥2. Optionally, the flash assembly 10 may include a two-stage flash evaporator, a three-stage flash evaporator, a four-stage flash evaporator, etc. The specific number of flash evaporators can be set according to the temperature and pressure of the black water entering the black water treatment device, as well as actual needs.

[0035] Depend on Figure 1 As shown, the flash assembly 10 includes two-stage flash evaporators, namely, a first-stage flash evaporator 11 and a second-stage flash evaporator 12, to flash black water Aa with a temperature between 70-85°C, which is conducive to reducing costs. Accordingly, the number of heat exchange structures 20 is set to two, which are respectively arranged downstream of the first-stage flash evaporator 11 and the second-stage flash evaporator 12. Among them, the first-stage flash evaporator 11 and the second-stage flash evaporator 12 are both set as vacuum flash evaporators, which make the liquid easier to gasify by using the principle that the boiling point of the liquid is lower in a vacuum state.

[0036] The specific implementation process of the black water treatment device provided by an embodiment of the present application is as follows: black water Aa with a temperature between 70-85°C enters the first-stage flash evaporator 11 from the liquid phase inlet for flash evaporation to form black water Aa' containing more solid particles and gas aa. The gas aa is filtered by the filter structure 30 and flows out from the gas phase outlet and enters one of the heat exchange structures 20 to exchange heat with the substance therein. The black water Aa' containing more solid particles flows out from the liquid phase outlet of the first-stage flash evaporator 11 and enters the second-stage flash evaporator 12 from the liquid phase inlet of the second-stage flash evaporator 12 for further flash evaporation and cooling to form black water Aa" containing more solid particles and a temperature between 45-50°C and gas aa'. The gas aa' is filtered by the filter structure 30 and flows out from the gas phase outlet and enters another heat exchange structure 20 to exchange heat with the medium therein. The black water Aa" containing more solid particles is discharged to the sedimentation tank for solid-liquid separation.

[0037] After two flash evaporations, the temperature of the black water with a temperature between 70 and 85°C is reduced to between 45 and 50°C, part of the water in the black water is flashed into gas, and the carbon and ash in the black water are concentrated. The black water with a reduced temperature and fixed concentrated is sent to the sedimentation tank, which is conducive to solid-liquid separation in the sedimentation tank. In addition, the black water treated by the black water treatment device has been cooled to between 45 and 50°C. Therefore, the gray water separated after sedimentation does not need to be cooled by a cooler before being discharged to the sewage treatment facility, which can solve the problem of scaling and clogging of the cooler. In addition, since the first-stage flash evaporator 11 and the second-stage flash evaporator 12 are both provided with a filter structure 30, the filter structure 30 can separate the solid particles entrained in the gas to ensure the cleanliness of the gas and avoid a large number of solid particles from gathering in the heat exchange structure 20, which is conducive to preventing the heat exchange structure 20 from scaling and clogging.

[0038] Furthermore, since a heat exchange structure 20 is provided downstream of the first-stage flash evaporator 11, the gas discharged from the first-stage flash evaporator 11 with a temperature of 70-85°C can be heat exchanged with the material in the heat exchange structure 20. The black water treatment device provided in the embodiment of the present application can make full use of the black water with a temperature of 70-85°C and avoid waste of waste heat.

[0039] Optionally, the heat exchange structure 20 connected to the first-stage flash evaporator 11 may be a circulating water cooler, and the heat exchange structure 20 connected to the second-stage flash evaporator 12 may also be a circulating water cooler.

[0040] Among them, the pressure of the first-stage flash evaporator 11 is controlled between 0.03-0.06MPa, and the temperature is between 70-85°C. The pressure of the second-stage flash evaporator 12 is controlled between 0.0096-0.012MPa, and the temperature is between 45-50°C. The liquid phase outlet of the first-stage flash evaporator 11 is connected to the liquid phase inlet of the second-stage flash evaporator 12 to ensure that the temperature of the black water can be reduced to between 45-50°C after flashing through the first-stage flash evaporator 11 and the second-stage flash evaporator 12 in sequence, and it is effective to be directly discharged to the sewage treatment facility.

[0041] The first-stage flash evaporator 11 and the second-stage flash evaporator 12 respectively have a liquid phase inlet, a liquid phase outlet and a gas phase outlet. The liquid phase outlet of the first-stage flash evaporator 11 is connected to the liquid phase inlet of the second-stage flash evaporator 12, so that the black water in the first-stage flash evaporator 11 flows into the second-stage flash evaporator 12 for further flash evaporation and cooling. The gas phase outlet of the first-stage flash evaporator 11 is connected to one of the heat exchange structures 20, and the gas phase outlet of the second-stage flash evaporator 12 is connected to the other heat exchange structure 20, so that the gas can enter the heat exchange structure 20 and exchange heat with the internal material thereof. The two heat exchange structures 20 are respectively connected to the power system 40 to drive the gas in the first-stage flash evaporator 11 and the second-stage flash evaporator 12 to enter the heat exchange structure 20 connected thereto.

[0042] The power system 40 is connected to the two heat exchange structures 20 respectively to drive the gases in the two heat exchange structures 20 to enter the power system 40, thereby driving the gases in the first-stage flash evaporator 11 and the second-stage flash evaporator 12 to enter the heat exchange structures 20 connected thereto, so as to control the gas pressure in the first-stage flash evaporator 11 and the second-stage flash evaporator 12 to remain in a stable state.

[0043] The power system 40 may include a vacuum pump. The number of vacuum pumps may be one, two, or multiple. For example, the number of vacuum pumps is one, and the two heat exchange structures 20 are connected to one vacuum pump, which helps to reduce costs.

[0044] Optionally, the filter structure 30 may include a stainless steel Raschig ring, which has the advantages of thin wall, heat resistance, large flow rate, small resistance, and is not easy to deform and has a long service life, thereby ensuring the effect of purifying gas.

[0045] Optionally, the filter structure 30 may further include a stainless steel ball ring having an inner tongue that bends inwardly to facilitate gas-liquid fluidity.

[0046] In the height direction X, the filter structure 30 is located between the liquid phase inlet and the gas phase outlet, which helps to ensure the effectiveness of gas cleaning and prevent interference between the black water and the filter structure 30, so as to ensure the reliability of the black water treatment device.

[0047] Taking the first-stage flash evaporator 11 as an example, in the height direction X, the liquid phase inlet is located at the middle position of the first-stage flash evaporator 11, the gas phase outlet is located at the top position of the first-stage flash evaporator 11, and the liquid phase outlet is located at the bottom position of the first-stage flash evaporator 11.

[0048] In some optional embodiments, in a black water treatment device provided by an embodiment of the present application, the length dimension of the filter structure 30 in the height direction X is between 400 mm and 600 mm, and includes two endpoint values ​​of 400 mm and 600 mm. If the filter structure 30 is designed to be too thin, that is, its length dimension in the height direction X is less than 400 mm, the cleaning effect of the filter structure 30 on the gas will be reduced, so that solid particles may exist in the gas, and the heat exchange structure 20 still has the risk of scaling and clogging. If the filter structure 30 is designed to be too thick, that is, its length dimension in the height direction X is greater than 600 mm, the cost will be increased, resulting in waste. Therefore, setting the length dimension of the filter structure 30 in the height direction X between 400 mm and 600 mm can better ensure the cleaning effect of the filter structure 30 and also help reduce costs.

[0049] As an optional embodiment, the filter structure 30 is detachably connected to the flash evaporator. This arrangement is convenient for cleaning and maintenance, and helps to ensure the normal use of the black water treatment device.

[0050] Optionally, the filter structure 30 can be detachably connected to the inner wall of the flash evaporator by fasteners such as bolts, nuts, screws, etc. The filter structure 30 can also be detachably connected to the flash evaporator by a snap connection, and one of the filter structure 30 and the flash evaporator is provided with a slot, and the other is provided with a protrusion, and the protrusion is snap-connected with the slot. The filter structure 30 can also be detachably connected to the flash evaporator by a threaded connection.

[0051] like Figure 1 As shown, the filtering structure 30 in the first-stage flash evaporator 11 is detachably connected to the first-stage flash evaporator 11 , and the filtering structure 30 in the second-stage flash evaporator 11 is detachably connected to the second-stage flash evaporator 12 .

[0052] During the specific use of the black water treatment device provided by an embodiment of the present application, the filter structure 30 is prone to accumulate solid particles such as carbon and ash, and long-term use may cause clogging of the filter structure 30. Therefore, the filter structure 30 and the flash evaporator are configured to be detachably connected to facilitate cleaning, maintenance and even replacement of the filter structure 30, thereby preventing clogging of the filter structure 30 and ensuring normal use of the black water treatment device.

[0053] In some optional embodiments, in a black water treatment device provided by an embodiment of the present application, a flash evaporator is filled with fillers, and the filter structure 30 is supported by the fillers and is disposed in contact with the inner wall of the flash evaporator.

[0054] The filler may include wire mesh filler, and the adsorption force of the wire mesh filler is used to effectively separate the gas and liquid formed after the flash evaporation of black water. Of course, the filler may also include plate corrugated filler, which makes the gas distribution more uniform, so that the liquid can more fully absorb the surrounding heat and vaporize.

[0055] Taking the filtering structure 30 in the first-stage flash evaporator 11 as an example, the cross-sectional shape of the filtering structure 30 is the same as the cross-sectional shape of the first-stage flash evaporator 11, and the cross-sectional size of the filtering structure 30 is slightly smaller than the cross-sectional size of the first-stage flash evaporator 11, so that the filtering structure 30 can be arranged in the first-stage flash evaporator 11 and abut against the inner wall of the first-stage flash evaporator 11, so as to better filter the gas aa.

[0056] By supporting the filter structure 30 on the filler, it is easy to assemble, and at the same time, it is easy to disassemble, clean and update the filter structure 30.

[0057] As an optional embodiment, one of the heat exchange structures 20 is a desalted water heat exchanger, and the gas entering the desalted water heat exchanger from the gas phase outlet of the flash evaporator can heat the material in the desalted water heat exchanger to between 40°C and 65°C.

[0058] By setting it up in this way, the heat of black water with a temperature between 70°C and 85°C can be fully utilized to avoid waste of residual heat.

[0059] The black water treatment device provided by one embodiment of the present application has a heat exchange structure 20 connected to the first-stage flash evaporator 11, which is a desalted water heat exchanger. The desalted water bb with a lower temperature enters the desalted water heat exchanger to exchange heat with the gas aa, forming desalted water bb' with a higher temperature and is discharged from the desalted water heat exchanger, making full use of the waste heat of the black water, heating the desalted water bb with a lower temperature to desalted water bb' with a higher temperature, and performing secondary utilization of heat, which is beneficial to improving the utilization rate of heat. The heated desalted water bb' can be returned to the system for recycling. It is understandable that the desalted water bb' can be used as the circulating water of the system, and can also be used for flushing processes. Of course, it can be used for other processes to save costs. Among them, the temperature of the desalted water bb' is between 40°C and 65°C.

[0060] In a black water treatment device provided by an embodiment of the present application, the heat exchange structure 20 connected to the second-stage flash evaporator 12 is a circulating water cooler. The circulating water cc with a lower temperature enters the circulating water cooler to exchange heat with the gas aa' to become the circulating water cc' with a higher temperature and is discharged from the circulating water cooler to be used as system circulating water.

[0061] As an optional implementation, the n-th stage flash evaporator further includes a liquid inlet connected to the power system 40, so that the condensate in the power system 40 enters the n-th stage flash evaporator through the liquid inlet.

[0062] It is understandable that the gas formed after the black water is flashed by the flash evaporator includes non-condensable gas and water vapor. The non-condensable gas and water vapor enter the power system 40 after heat exchange with the substances inside them through the heat exchange structure 20. The water vapor liquefies to form condensate due to the change in temperature.

[0063] like Figure 1 As shown, in a black water treatment device provided by an embodiment of the present application, gas aa and gas aa' enter the power system after heat exchange with the material in the heat exchange structure 20, and the water vapor in gas aa and gas aa' can be liquefied to form condensate a, and condensate a enters the second-stage flash evaporator 12 from the liquid inlet to enter the sedimentation tank together with the black water Aa" therein for solid-liquid separation, which is beneficial to improve the efficiency of the black water treatment device and avoid waste. The power system 40 can also be provided with an outlet, and the non-condensable gas a' in gas aa and gas aa' is discharged from the outlet to ensure the safety of the power system 40.

[0064] As an optional implementation, in the height direction X, the flash evaporators of each stage are arranged in sequence along the height direction X, and the height dimension of the first-stage flash evaporator is greater than the height dimension of the n-stage flash evaporator.

[0065] By arranging in this way, the black water between the flash evaporators of each stage can flow by gravity, which is beneficial to improving the efficiency of the black water treatment device and reducing costs.

[0066] Depend on Figure 1 As shown, a black water treatment device provided by an embodiment of the present application, the first-stage flash evaporator 11 is located above the second-stage flash evaporator 12, the liquid phase outlet of the first-stage flash evaporator 11 is located at the bottom of the first-stage flash evaporator 11, and the liquid phase inlet of the second-stage flash evaporator 12 is located at the side of the second-stage flash evaporator 12, and the two are connected by a pipeline to achieve gravity flow of black water Aa'.

[0067] See also Figure 1 and Figure 2 As an optional implementation, n-stage flash evaporators are integrated, the flash assembly 10 includes a shell, the shell includes a wall portion 1011, the wall portion 1011 encloses n cavities 1012, the n cavities 1012 are arranged in sequence along the height direction X, and one cavity 1012 is set as a first-stage flash evaporator.

[0068] A black water treatment device provided in an embodiment of the present application integrates the first-stage flash evaporator 11 and the second-stage flash evaporator 12 so that the first-stage flash evaporator 11 and the second-stage flash evaporator 12 are both arranged in the same shell, which is convenient for processing and manufacturing and helps to reduce costs.

[0069] Since the pressure in the first-stage flasher 11 is greater than the pressure in the second-stage flasher 12 , the area of ​​the cavity 1012 forming the first-stage flasher 11 may be smaller than the area of ​​the cavity 1012 forming the second-stage flasher 12 .

[0070] See also Figure 1 As an optional embodiment, the black water treatment device also includes a regulating valve 50, and a regulating valve 50 is arranged between the power system 40 and each heat exchange structure 20, and the regulating valve 50 is configured to control the flow of gas entering the heat exchange structure 20 through the gas phase outlet.

[0071] In a black water treatment device provided by an embodiment of the present application, a regulating valve 50 is provided on the pipeline connecting the power system 40 and the two heat exchange structures 20. The regulating valve 50 adjusts the flow rate of the gas in the pipeline by adjusting the opening of the valve so that the first-stage flash evaporator 11 and the second-stage flash evaporator 12 have the corresponding preset pressure, thereby ensuring the stable operation of the black water treatment device.

[0072] Optionally, the regulating valve 50 includes an electric regulating valve 50, which can automatically adjust the flow rate to control the pressure in the first-stage flash evaporator 11 and the second-stage flash evaporator 12, which is conducive to ensuring the stability of the black water treatment device. Of course, the regulating valve 50 can also be set as a pneumatic regulating valve 50 or a self-operated regulating valve 50.

[0073] As an optional implementation, the black water treatment device further includes a pressure gauge 60, which is disposed between each stage of the flash evaporator and the heat exchange structure 20, and the pressure gauge 60 is configured to detect the pressure value in the flash evaporator.

[0074] In a black water treatment device provided by an embodiment of the present application, a pressure gauge 60 is provided on the pipe connecting the first-stage flash evaporator 11 and one of the heat exchange structures 20, and a pressure gauge 60 is provided on the pipe connecting the second-stage flash evaporator 12 and another of the heat exchange structures 20. The pressure gauge 60 is used to detect the pressure value in the first-stage flash evaporator 11 and the second-stage flash evaporator 12, so as to facilitate the operator to detect the data. When the pressure value is different from the preset pressure value, it is convenient for the operator to adjust the regulating valve 50 in time to ensure the safety of the black water treatment device.

[0075] Optionally, the black water treatment device also includes a control module. When the pressure value detected by the pressure gauge 60 does not meet the preset pressure value range, the pressure gauge 60 sends an adjustment signal to the control module. The control module receives the adjustment signal and controls the regulating valve 50 to adjust, which is beneficial to improving the efficiency and stability of the black water treatment device.

[0076] As an optional embodiment, the black water treatment device also includes a pre-cooling assembly, which is arranged upstream of the flash evaporation assembly 10. The black water can enter the flash evaporation assembly 10 through the pre-cooling assembly. The pre-cooling assembly is configured to cool the black water to a first temperature, and the flash evaporation assembly 10 is configured to cool the black water at the first temperature to a second temperature lower than the first temperature.

[0077] The first temperature may be between 70-85°C, and the second temperature may be between 45-50°C.

[0078] In a black water treatment device provided by an embodiment of the present application, the black water is first cooled to a first temperature, i.e., between 70-85°C, by a pre-cooling assembly, and then enters a flash evaporation assembly 10 to be further cooled to a second temperature, i.e., between 45-50°C. The black water at the second temperature can be discharged to a sedimentation tank for solid-liquid separation, which helps to prevent scaling and clogging.

[0079] Optionally, the pre-cooling assembly includes a high-pressure flash evaporator, a low-pressure flash evaporator, and the like.

[0080] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A black water treatment device, characterized in that: include: A flash evaporation assembly (10) comprises n stages of flash evaporators, each stage of the flash evaporators comprising a liquid phase inlet, a liquid phase outlet and a gas phase outlet, wherein in two adjacent stages of the flash evaporators, the liquid phase outlet of the flash evaporator of the previous stage is connected to the liquid phase inlet of the flash evaporator of the next stage, and black water can enter from the liquid phase inlet of the flash evaporator of the first stage and pass through the flash evaporators of each stage in sequence, and be discharged from the liquid phase outlet of the flash evaporator of the nth stage, where n≥2; Two or more heat exchange structures (20), the heat exchange structures (20) being arranged one-to-one with the flash evaporators, and each of the heat exchange structures (20) being in communication with the gas phase outlet of each stage of the flash evaporators; A filtering structure (30), wherein each stage of the flash evaporator is provided with the filtering structure (30), and in the height direction (X) of the flash evaporator, the filtering structure (30) is provided between the liquid phase inlet and the gas phase outlet; A power system (40) is connected to the heat exchange structure (20), and the power system (40) is configured to drive the gas in each stage of the flash evaporator to enter each heat exchange structure (20) through the gas phase outlet to exchange heat with the material in the heat exchange structure (20).

2. The black water treatment device according to claim 1, characterized in that: The filtering structure (30) is detachably connected to the flash evaporator.

3. The black water treatment device according to claim 2, characterized in that: The flash evaporator is filled with fillers, and the filtering structure (30) is supported by the fillers and is arranged in contact with the inner wall of the flash evaporator.

4. The black water treatment device according to any one of claims 1 to 3, characterized in that: One of the heat exchange structures (20) is a desalted water heat exchanger, and the gas entering the desalted water heat exchanger from the gas phase outlet of the flash evaporator can heat the material in the desalted water heat exchanger to between 40°C and 65°C.

5. The black water treatment device according to any one of claims 1 to 3, characterized in that: The n-th stage flash evaporator further comprises a liquid inlet connected to the power system (40), so that the condensate in the power system (40) enters the n-th stage flash evaporator through the liquid inlet.

6. The black water treatment device according to any one of claims 1 to 3, characterized in that: In the height direction (X), the flash evaporators of each stage are arranged in sequence along the height direction (X), and the height dimension of the flash evaporator of the first stage is greater than the height dimension of the flash evaporator of the nth stage.

7. The black water treatment device according to claim 6, characterized in that: The n-stage flash evaporators are integrated, the flash assembly (10) comprising a shell, the shell comprising a wall portion (1011), the wall portion (1011) enclosing n cavities (1012), the n cavities (1012) being arranged in sequence along the height direction (X), and one cavity (1012) being set as a first-stage flash evaporator.

8. The black water treatment device according to any one of claims 1 to 3, characterized in that: The black water treatment device further comprises a regulating valve (50), wherein the regulating valve (50) is provided between the power system (40) and each of the heat exchange structures (20), and the regulating valve (50) is configured to control the flow rate of the gas entering the heat exchange structure (20) via the gas phase outlet.

9. The black water treatment device according to any one of claims 1 to 3, characterized in that: The black water treatment device further comprises a pressure gauge (60), wherein the pressure gauge (60) is arranged between each stage of the flash evaporator and the heat exchange structure (20), and the pressure gauge (60) is configured to detect the pressure value in the flash evaporator.

10. The black water treatment device according to any one of claims 1 to 3, characterized in that: The black water treatment device further comprises a pre-cooling assembly, wherein the pre-cooling assembly is arranged upstream of the flash evaporation assembly (10), and black water can enter the flash evaporation assembly (10) via the pre-cooling assembly. The pre-cooling assembly is configured to cool the black water to a first temperature, and the flash evaporation assembly (10) is configured to cool the black water at the first temperature to a second temperature lower than the first temperature.

Images