A drain recovery system for a vapor compressor

Abstract

A kind of hydrophobic recovery system for steam compressor, including exhaust unit, steam-water separator, hydrophobic tank, steam compressor, heat pump unit, pipeline;Steam-water separator connects exhaust unit, hydrophobic tank, steam compressor, heat pump unit is connected with steam-water separator and hydrophobic tank respectively, exhaust unit, steam-water separator, hydrophobic tank, steam compressor, heat pump unit are communicated by pipeline;Exhaust unit imports the high-pressure steam produced in steam-water separator, steam-water separator separates water in high-pressure steam, and is transported to hydrophobic tank, high-pressure steam is input into steam compressor;Heat pump unit pressurizes and warms the hydrophobic in hydrophobic tank, and exports high-pressure steam, and the steam body produced by exhaust unit is collected and input into steam-water separator, and high-pressure steam is supplied to steam compressor for use.By recovering the hydrophobic in hydrophobic tank with heat pump unit, part of heat is converted into steam by supplementing, and is input into steam compressor for use again, and energy utilization is significantly improved.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery technology, and more particularly to a hydrophobic recovery system for a steam compressor. Background Technology

[0002] In coal chemical production, steam serves as the core energy carrier, permeating the entire process from gasification and conversion to synthesis and distillation. Simultaneously, the steam compressor is a crucial piece of equipment for recovering low-pressure exhaust steam; its interstage cooling process generates a large amount of condensate at 80-100°C, also known as hydrophobic water.

[0003] In existing technologies, hydrophobic materials are usually only used for miscellaneous water use (such as flushing and water replenishment). However, hydrophobic materials have a temperature of 80℃-100℃, and the waste heat is not fully utilized. Direct discharge of these materials leads to energy loss. Utility Model Content

[0004] The technical problem to be solved by this application is that in the prior art, hydrophobic materials are usually only used for miscellaneous water use, and the waste heat of hydrophobic materials with a temperature of 80℃-100℃ is not fully utilized, and direct discharge leads to energy loss.

[0005] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a hydrophobic recovery system for a steam compressor.

[0006] This utility model discloses a condensate recovery system for a steam compressor, which includes an exhaust unit, a steam-water separator, a condensate tank, a steam compressor, a heat pump unit, and pipelines; The steam-water separator is connected to the exhaust unit, the condensate tank, and the steam compressor, respectively. The heat pump unit is connected to the steam-water separator and the condensate tank, respectively. The exhaust unit, the steam-water separator, the condensate tank, the steam compressor, and the heat pump unit are connected by pipelines. The exhaust unit inputs the produced high-pressure steam into the steam-water separator, which separates the water from the high-pressure steam and sends it to the condensate tank. The high-pressure steam is then input into the steam compressor. The heat pump unit pressurizes and heats the condensate in the condensate tank to produce high-pressure steam, which is then collected with the steam produced by the exhaust unit and fed into the steam-water separator. The high-pressure steam is then supplied to the steam compressor.

[0007] Preferably, the steam-water separator includes an inlet, an outlet, and an exhaust port. The inlet is connected to the exhaust unit, the outlet is connected to the condensate tank, and the exhaust port is connected to the steam compressor.

[0008] Preferably, it includes a pretreatment unit, which is connected to the condensate tank and the heat pump unit respectively.

[0009] Preferably, the pretreatment unit includes a hydrophobic pump and a filter; The condensate pump is connected to the condensate tank and the filter respectively. The condensate pump is used to extract condensate from the condensate tank, and the filter is used to remove impurities from the condensate. The other end of the filter is connected to a steam compressor.

[0010] Preferably, the pretreatment unit includes a buffer tank, which is connected to the hydrophobic pump.

[0011] Preferably, the heat pump unit includes a storage tank for storing low-pressure heat source water.

[0012] Preferably, the heat pump unit includes an evaporator, a compressor, and a condenser, wherein the evaporator is connected to a storage tank and the compressor, and the compressor is connected to a filter and a buffer tank. The evaporator is used to heat low-pressure heat source water to generate low-pressure gaseous working fluid. The condenser is used to heat the hydrophobic material, and the inlet of the condenser is connected to the compressor. The compressor is used to compress the low-pressure gaseous working fluid output from the evaporator into a high-temperature, high-pressure gaseous working fluid, providing energy for hydrophobic heating.

[0013] Preferably, the heat pump unit includes an auxiliary heater, which is connected to both the condenser and the inlet of the steam-water separator. The auxiliary heater is used to heat the gas.

[0014] Preferably, the pipeline includes a first steam header, a second steam header, and a third steam header. The first steam header is connected at both ends to the exhaust unit and the input port of the steam-water separator, respectively. The pipeline between the steam-water separator and the steam compressor uses the second steam header, and the pipeline connecting the condenser to the compressor and the steam-water separator uses the third steam header.

[0015] Preferably, the steam compressor is connected to the condensate tank, and the condensate from the steam compressor is collected and stored in the condensate tank.

[0016] The technical solution provided in this application has the following advantages compared with the prior art: This application provides a condensate recovery system for a steam compressor, which recovers condensate from the condensate tank of a heat pump unit, adds some heat to convert it into steam, and then re-inputs it into the steam compressor for use, significantly improving energy efficiency.

[0017] Furthermore, the condensate generated in the steam compressor re-enters the condensate tank, which maintains a certain amount of condensate in the tank. This allows the condensate tank to be connected to the plant's circulating water system for water supply, and also allows it to re-enter the system as condensate, thereby reducing water waste and improving water resource utilization.

[0018] Furthermore, the circulating water generated by the evaporator in the heat pump unit can be recycled and reused in the plant's circulating water system, or returned to the storage tank for reuse in the evaporator. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a hydrophobic recovery system for a steam compressor provided in this application. Figure 1 ; Figure 2 A schematic diagram of a hydrophobic recovery system for a steam compressor provided in this application. Figure 2 ; Figure 3 A schematic diagram of a hydrophobic recovery system for a steam compressor provided in this application. Figure 3 ; Figure 4 This application provides a schematic diagram of the structure of a steam compressor for a hydrophobic recovery system of a steam compressor.

[0022] Explanation of reference numerals in the attached figures: 1. A hydrophobic recovery system for steam compressors; 11. Heat pump unit; 111. Evaporator; 112. Compressor; 113. Condenser; 114. Storage tank; 115. Auxiliary heater; 12. Drainage tank; 13. Steam compressor; 14. Exhaust unit; 15. Steam-water separator; 16. Pretreatment unit; 161. Drain pump; 162. Filter; 163. Buffer tank. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] See Figure 1-4 This utility model discloses a condensate recovery system 1 for a steam compressor 13, which includes a steam exhaust unit 14, a steam-water separator 15, a condensate tank 12, a steam compressor 13, a heat pump unit 11, and pipelines. The steam-water separator 15 is connected to the steam exhaust unit 14, the condensate tank 12, and the steam compressor 13. The heat pump unit 11 is connected to the steam-water separator 15 and the condensate tank 12. 13. The heat pump unit 11 is connected via a pipeline. The exhaust unit 14 inputs the produced high-pressure steam into the steam-water separator 15. The steam-water separator 15 separates the water from the high-pressure steam and sends it to the condensate tank 12. The high-pressure steam is then input into the steam compressor 13. The heat pump unit 11 pressurizes and heats the condensate in the condensate tank 12 to produce high-pressure steam, which is then collected with the steam produced by the exhaust unit 14 and input into the steam-water separator 15. The high-pressure steam is then supplied to the steam compressor 13 for use.

[0025] Specifically, the exhaust unit 14 is used to treat the steam generated during the operation of the deaerator. It adopts the V1411A deaerator exhaust system, which is a key auxiliary system for the deaerator. Its core function is to ensure the deaeration effect, stabilize the equipment operation, and realize energy recovery. The generated steam is fed into the steam compressor 13 for processing, with an exhaust steam discharge rate of 14.562 tons per hour. The steam compressor 13 is a 5-stage centrifugal compressor 112, which mechanically compresses and increases the pressure and temperature of the low-pressure steam, converting it from low-grade waste steam into reusable steam. The system uses high-grade steam (heated to 159°C and pressurized to 0.6 MPa). A steam-water separator 15 separates residual trace droplets from the vaporized steam to ensure steam dryness. A condensate tank 12 collects the residual trace droplets separated in the steam-water separator 15, with the condensate temperature in the tank 12 between 80°C and 100°C. The heat pump unit 11 converts the condensate from the condensate tank 12 into steam, which is then reintroduced into the steam compressor 13 to increase the steam input. Simultaneously, the condensate in the condensate tank 12 is reused. The steam-water separator 15 includes an inlet, an outlet, and an outlet. The inlet is connected to the exhaust unit 14, the outlet is connected to the condensate tank 12, and the outlet is connected to the steam compressor 13. In other words, the inlet of the steam-water separator 15 is used to input steam, the outlet is used to output steam, and the outlet discharges the separated liquid.

[0026] In addition, the pipeline connects the various mechanisms. The pipeline includes a first steam transmission header, a second steam transmission header, and a third steam transmission header. The steam transmission pipeline adopts the steam transmission header. The two ends of the first steam transmission header are respectively connected to the exhaust unit and the input port of the steam-water separator 15. The pipeline between the steam-water separator 15 and the steam compressor 13 adopts the second steam transmission header. The pipeline connecting the condenser 113 to the compressor 112 and the steam-water separator 15 adopts the third steam transmission header.

[0027] It is understandable that by recovering the condensate from the condensate tank 12 of the heat pump unit 11, supplementing some heat to convert it into steam, and then re-inputting it into the steam compressor 13 for use, energy utilization efficiency is significantly improved. Furthermore, the condensate produced in the steam compressor 13 re-enters the condensate tank 12, ensuring a certain amount of condensate remains within the tank. This allows the condensate tank 12 to be connected to the plant's circulating water system for water supply, and also allows it to re-enter the system as condensate, reducing water waste and improving water utilization. The steam entering the steam compressor 13 is not limited to exhaust steam; increasing the steam converted from condensate in the condensate tank 12 prevents instability in the operation of the steam compressor 13 due to fluctuations in exhaust steam volume.

[0028] Furthermore, the circulating water produced by the evaporator 111 in the heat pump unit 11 can be recycled and reused in the plant's circulating water system, or returned to the storage tank 114 for reuse in the evaporator 111. Specifically, since the circulating water from the evaporator 111 is at a low temperature, it is usually used as the plant's circulating water. If the storage level of low-pressure heat source water in the storage tank 114 is lower than expected, the circulating water can be re-injected into the storage tank 114 for backup.

[0029] As one embodiment, the system includes a controller that is electrically connected to various mechanisms. A solenoid valve is installed on the pipeline, and the controller is electrically connected to the solenoid valve installed on the pipeline. The controller can control the opening, closing, and adjustment of various mechanisms through electrical signals. At the same time, the controller can also control the opening, closing, and adjustment of the solenoid valve through electrical signals, thereby controlling the time and amount of steam and water transmission.

[0030] As one embodiment, the steam compressor 13 is connected to the condensate tank 12, and the condensate from the steam compressor 13 is collected and stored in the condensate tank 12. It is understood that the integrated oil station and high-level oil tank inside the steam compressor 13 require cooling, generating condensate. Collecting the condensate in the condensate tank 12 increases the amount of condensate stored in the condensate tank 12.

[0031] The system includes a pretreatment unit 16, which is connected to the condensate tank 12 and the heat pump unit 11. The pretreatment unit 16 is used to pretreat the gas or liquid entering the heat pump unit 11. Specifically, the pretreatment unit 16 includes a condensate pump 161, a filter 162, and a buffer tank 163. The condensate pump 161 is connected to both the condensate tank 12 and the filter 162, and is used to extract condensate from the condensate tank 12. The inlet of the filter 162 is connected to the outlet of the condensate pump 161, and it has a built-in 5μm filter element for removing trace impurities from the condensate. The other end of the filter 162 is connected to a steam compressor 13. The pretreatment unit 16 includes the buffer tank 163 connected to the condensate pump 161.

[0032] Specifically, the condensate pump 161 is used to draw condensate from the condensate tank 12 and transfer it to the heat pump unit 11. The filter 162 is used to filter and remove impurities from the condensate. The inlet of the buffer tank 163 is connected to the outlet of the precision filter 162. The tank is equipped with a level sensor and a pressure sensor to store the condensate filtered by the filter 162, stabilize the condensate flow rate and pressure, and keep the condensate flow rate at 2-3 tons / hour and the pressure at 0.3-0.4 MPa so that it can be used in large quantities in the heat pump unit 11.

[0033] The heat pump unit 11 includes an evaporator 111, a compressor 112, a condenser 113, and a storage tank 114. The evaporator 111 is connected to the storage tank 114 and the compressor 112. The compressor 112 is connected to a filter 162 and a buffer tank 163. The buffer tank 163 is connected to a condensate tank 12 and the compressor 112. The evaporator 111 is used to heat low-pressure heat source water to generate low-pressure gaseous working fluid. The condenser 113 is used to heat the condensate. The inlet of the condenser 113 is connected to the compressor 112. The compressor 112 is used to compress the low-pressure gaseous working fluid output from the evaporator 111 into a high-temperature, high-pressure gaseous working fluid to provide energy for heating the condensate. The storage tank 114 is used to store low-pressure heat source water, which can be the plant's circulating water with a temperature of 30℃-35℃. The condensate needs to be heated to 100℃.

[0034] Specifically, the heat pump unit 11 heats the circulating water by transferring heat to the condensate through a reverse circulation process of the working fluid. First, in the evaporator 111, the low-temperature, low-pressure liquid working fluid (-5℃) absorbs heat from the low-pressure heat source water and evaporates into a low-pressure gaseous state (10℃), while the low-pressure heat source water cools down to 28℃ and flows back. Next, the compressor 112 consumes electrical energy to compress the low-pressure gaseous working fluid into a high-temperature, high-pressure gaseous state (120℃, 1.5MPa), making its temperature higher than that of the condensate (80℃). Subsequently, the high-temperature working fluid releases heat to the condensate in the condenser and condenses into a high-pressure liquid state (40℃), while the condensate absorbs heat and rises to 100℃. Finally, the working fluid is throttled and depressurized by the expansion valve between the condenser and the evaporator 111 to a low-temperature, low-pressure liquid state (-5℃) and returns to the evaporator 111 to complete the cycle. The entire process is powered by a small amount of electrical energy, realizing the reverse transfer of heat from the low-temperature circulating water to the high-temperature condensate, efficiently heating the condensate while significantly reducing energy consumption. The working fluid used in the heat pump unit 11 is a refrigerant, which is used to transfer heat between the condenser and the evaporator 111.

[0035] For example, if the factory's circulating water at 32°C is used as the low-pressure heat source, the heat pump evaporator 111 absorbs heat from the circulating water, causing the circulating water temperature to drop to 28°C. The working fluid then uses the compressor 112 to raise the temperature to 120°C, ultimately heating the condensate. Since the circulating water system is an existing facility in the factory, it only requires the electrical energy needed by the compressor 112. The heat lost by the circulating water is free energy. The condensate itself has a temperature, so the energy required for heating is relatively small, significantly reducing the energy consumption for heating the condensate. Compared to directly heating the condensate with electricity, the energy saving rate can reach over 60%.

[0036] As one embodiment, the hydrophobic fluid can be heated to 120°C, allowing it to directly become gaseous, thus meeting the requirements of the steam compressor 13. The working fluid used in the heat pump unit 11 needs to be compressed to 140°C during compression to meet the hydrophobic heating requirement.

[0037] As one embodiment, the heat pump unit 11 includes an auxiliary heater 115, which is connected to the condenser 113 and the inlet of the steam-water separator 15 respectively, and is used to heat the gas.

[0038] Specifically, the auxiliary heater 115 uses electric heating or steam heating to heat the 100℃ hydrophobic water to 112℃-120℃ (0.15MPa.a saturation temperature) so that it is completely vaporized to meet the temperature requirements. At the same time, the hydrophobic water can be completely vaporized to reduce liquid residue.

[0039] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0040] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0045] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

[0046] The above description describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A hydrophobic recovery system for a steam compressor, characterized in that, Includes exhaust unit, steam-water separator, condensate tank, steam compressor, heat pump unit, and piping; The steam-water separator is connected to the exhaust unit, the condensate tank, and the steam compressor, respectively. The heat pump unit is connected to the steam-water separator and the condensate tank, respectively. The exhaust unit, the steam-water separator, the condensate tank, the steam compressor, and the heat pump unit are connected by pipelines. The exhaust unit inputs the produced high-pressure steam into the steam-water separator, which separates the water from the high-pressure steam and sends it to the condensate tank. The high-pressure steam is then input into the steam compressor. The heat pump unit pressurizes and heats the condensate in the condensate tank to produce high-pressure steam, which is then collected with the steam produced by the exhaust unit and fed into the steam-water separator. The high-pressure steam is then supplied to the steam compressor.

2. The system according to claim 1, characterized in that, The steam-water separator includes an inlet, an outlet, and an exhaust port. The inlet is connected to the exhaust unit, the outlet is connected to the condensate tank, and the exhaust port is connected to the steam compressor.

3. The system according to claim 1, characterized in that, It includes a pretreatment unit, which is connected to the condensate tank and the heat pump unit respectively.

4. The system according to claim 3, characterized in that, The pretreatment unit includes a hydrophobic pump and a filter; The condensate pump is connected to the condensate tank and the filter respectively. The condensate pump is used to extract condensate from the condensate tank, and the filter is used to remove impurities from the condensate. The other end of the filter is connected to a steam compressor.

5. The system according to claim 4, characterized in that, The pretreatment unit includes a buffer tank, which is connected to the hydrophobic pump.

6. The system according to claim 1, characterized in that, The heat pump unit includes a storage tank for storing low-pressure heat source water.

7. The system according to claim 1, characterized in that, The heat pump unit includes an evaporator, a compressor, and a condenser. The evaporator is connected to a storage tank and the compressor, and the compressor is connected to a filter and a buffer tank. The evaporator is used to heat low-pressure heat source water to generate low-pressure gaseous working fluid. The condenser is used to heat the hydrophobic material, and the inlet of the condenser is connected to the compressor. The compressor is used to compress the low-pressure gaseous working fluid output from the evaporator into a high-temperature, high-pressure gaseous working fluid, providing energy for hydrophobic heating.

8. The system according to claim 1, characterized in that, The heat pump unit includes an auxiliary heater, which is connected to the input ports of the condenser and the steam-water separator respectively. The auxiliary heater is used to heat the gas.

9. The system according to claim 7, characterized in that, The pipeline includes a first steam header, a second steam header, and a third steam header. The first steam header is connected at both ends to the exhaust unit and the input port of the steam-water separator, respectively. The pipeline between the steam-water separator and the steam compressor uses the second steam header. The pipeline connecting the condenser to the compressor and the steam-water separator uses the third steam header.

10. The system according to claim 1, characterized in that, The steam compressor is connected to the condensate tank, and the condensate from the steam compressor is collected and stored in the condensate tank.

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