A medium-pressure steam and condensate flash steam comprehensive utilization system

Abstract

The utility model belongs to condensate utilization technical field relates to a kind of medium-pressure steam and condensate flash steam comprehensive utilization system. Including flash tank, medium-pressure steam pipeline, hot pressure pump, extraction device and air cooling device;The flash tank is communicated with hot pressure pump and air cooling device respectively;The hot pressure pump is also communicated with medium-pressure steam pipeline and extraction device respectively. The utility model solves the technical problem that the water consumption of the pressure and temperature consumption of existing technology for reducing medium-pressure steam is too high and easily causes air cooler vibration, condensate pump often appears cavitation phenomenon, leads to equipment unstable operation.

Description

Technical Field

[0001] This utility model belongs to the field of condensate utilization technology, and relates to a comprehensive utilization system for medium-pressure steam and condensate flash steam. Background Technology

[0002] Chemical production generates a large amount of medium-pressure steam. Since medium-pressure steam has a temperature of 270-280℃ and a pressure of 1.45MPa, the traditional method of handling it is to de-temperature and depressurize it before discharge, which results in heat waste and energy consumption. Therefore, to achieve energy conservation, the current method is to de-temperature and depressurize the medium-pressure steam to obtain saturated steam, and then use the saturated steam as a heat source for the first-effect and second-effect falling film heat exchangers in the extraction unit. Although this method can utilize medium-pressure steam, it has the following problems:

[0003] Currently, medium-pressure steam is typically cooled and depressurized using water as a heat source, requiring 10 t / h of saturated steam. The demand for saturated steam is very large, resulting in a relatively large consumption of medium-pressure steam. However, the pressure difference between medium-pressure steam and the temperature and pressure difference between the medium-pressure steam and the saturated steam used as a heat source is large, leading to a large water consumption.

[0004] Meanwhile, chemical production processes release large amounts of condensate, which can freeze and cause injury, especially in winter. If the condensate is discharged into an air cooler for utilization, the vapor in the condensate can easily cause vibration of the air cooler, and the condensate pump often experiences cavitation, leading to unstable equipment operation.

[0005] Therefore, the large water consumption in the utilization of medium-pressure steam and condensate, the tendency to cause vibration in air coolers, and the frequent cavitation of condensate pumps, leading to unstable equipment operation, are technical problems that urgently need to be solved. Utility Model Content

[0006] This utility model provides a comprehensive utilization system for medium-pressure steam and condensate flash steam, which saves water and energy while ensuring the normal and stable operation of the equipment. This solves the technical problems in the prior art, such as excessive water consumption to reduce the pressure and temperature of medium-pressure steam, easy vibration of air cooler, frequent cavitation of condensate pump, and unstable equipment operation.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A system for the integrated utilization of medium-pressure steam and condensate flash steam includes a flash tank, a medium-pressure steam pipeline, a thermostatic pump, an extraction device, and an air-cooling device; the flash tank is connected to the thermostatic pump and the air-cooling device respectively; the thermostatic pump is also connected to the medium-pressure steam pipeline and the extraction device respectively.

[0009] Furthermore, a flash steam pipeline is provided between the flash tank and the autoclave pump.

[0010] Further specified, a first control valve is installed on the flash steam pipeline; a second control valve is installed on the medium-pressure steam pipeline.

[0011] Further specified, a flash steam pressure gauge is installed on the flash steam pipeline; a medium-pressure steam pressure gauge is installed on the medium-pressure steam pipeline; and a mixing pressure gauge is installed between the hot press pump and the extraction device.

[0012] Further specified, a flash steam thermometer is installed on the flash steam pipeline; a medium-pressure steam thermometer is installed on the medium-pressure steam pipeline; and a mixing thermometer is installed between the hot press pump and the extraction device.

[0013] Furthermore, the medium-pressure steam and condensate flash steam integrated utilization system also includes a condensate pipeline connected to the flash tank.

[0014] Further defined, the thermostatic pump includes a pump housing, a first feed pipe, a second feed pipe, and a mixing jet pipe; the pump housing is internally provided with a flow channel, which is a Venturi structure formed by a contraction section, a throat, and an expansion section connected sequentially along the material flow direction; the flash vapor pipeline is connected to the contraction section through the first feed pipe; the medium-pressure vapor pipeline is also connected to the contraction section through the second feed pipe; the expansion section is connected to the extraction device through the mixing jet pipe.

[0015] Furthermore, the first feed pipe, the second feed pipe, and the mixing jet pipe are all arranged along the tangential direction of the pump housing;

[0016] The first feed pipe and the second feed pipe are both located on the same side wall of the pump housing; the mixing jet pipe is located on the other opposite side wall of the pump housing.

[0017] Furthermore, a third control valve is provided between the flash tank and the air-cooling device.

[0018] Compared with the prior art, the technical effects of this utility model are:

[0019] 1. This utility model comprises a flash tank, a medium-pressure steam pipeline, a thermostatic pump, an extraction device, and an air-cooling device. The flash tank is connected to both the thermostatic pump and the air-cooling device. The thermostatic pump is also connected to both the medium-pressure steam pipeline and the extraction device. Flashing the steam out of the condensate eliminates steam in the condensate, effectively preventing air-cooler vibration and cavitation in the condensate pump, thus ensuring stable equipment operation. Furthermore, the flash steam cools and depressurizes the medium-pressure steam, reducing the amount of medium-pressure steam and saving water consumption.

[0020] 2. This utility model incorporates a flash steam pressure gauge, a medium-pressure steam pressure gauge, a mixing pressure gauge, a flash steam thermometer, a medium-pressure steam thermometer, and a mixing thermometer. Real-time monitoring values ​​from the three pressure gauges and three thermometers control the flow rates of flash steam and medium-pressure steam, ensuring that the pressure and temperature of the mixed fluid meet the heat source requirements. This design facilitates convenient operation and control while ensuring stable operation of the extraction device.

[0021] 3. In this utility model, the thermostatic pump includes a pump housing and a first feed pipe, a second feed pipe, and a mixing jet pipe respectively connected externally to the pump housing; the first feed pipe, the second feed pipe, and the mixing jet pipe are all arranged along the tangential direction of the pump housing; the pump housing is provided with a Venturi structure flow channel, which enables the flash steam and medium-pressure steam to mix quickly, reduce the temperature and pressure of the medium-pressure steam in a short time, save time, and improve efficiency. Attached Figure Description

[0022] Figure 1 A schematic diagram of the integrated utilization system for medium-pressure steam and condensate flash steam provided by this utility model;

[0023] Figure 2 This is a schematic diagram of the internal cross-section of a heat pump;

[0024] in:

[0025] 10-Condensate line; 20-Flash tank; 30-Flash steam line; 40-First control valve; 50-Medium-pressure steam line; 60-Second control valve; 70-Thermal pressure pump; 701-Pump housing; 702-First feed pipe; 703-Second feed pipe; 704-Mixing jet pipe; 705-Flash steam feed chamber; 706-Medium-pressure steam feed chamber; 707-Mixing chamber; 80-Extraction device; 90-Air cooling device; 100-Third control valve; 110-Condensate recovery tank;

[0026] P1 - Flash steam pressure gauge; P2 - Medium pressure steam pressure gauge; P3 - Mixed pressure gauge; T1 - Flash steam thermometer; T2 - Medium pressure steam thermometer; T3 - Mixed thermometer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] Unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. It should be noted that the technical terms used in this invention are for describing particular embodiments only and are not intended to limit the exemplary embodiments according to this invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this invention, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0029] See Figure 1 In one possible embodiment of this utility model, the integrated utilization system of medium-pressure steam and condensate flash steam includes a flash tank 20, a medium-pressure steam pipeline 50, a hot press pump 70, an extraction device 80, and an air-cooling device 90; the flash tank 20 is connected to the hot press pump 70 and the air-cooling device 90 respectively; the hot press pump 70 is also connected to the medium-pressure steam pipeline 50 and the extraction device 80 respectively.

[0030] Preferably, in one feasible embodiment of this utility model, the integrated utilization system of medium-pressure steam and condensate flash steam further includes a condensate pipeline 10 connected to the flash tank 20. During operation, the condensate flash tank 20 (0.2-0.3 MPa) flashes the condensate. The flash steam generated at the top of the flash tank 20 enters the flash steam pipeline 30 and, after pressure and temperature control, enters the hot press pump 70 through the first feed pipe 702 to mix with the medium-pressure steam. The condensate at the bottom of the flash tank 20 is sent to the air-cooling device 90. Because the steam in the condensate is flashed out, the condensate does not carry steam when entering the air-cooling device 90, preventing vibration of the air cooler and cavitation of the condensate pump, ensuring stable equipment operation. Simultaneously, the flash steam (temperature 80-90℃, pressure 0.1-0.2 MPa) flashed from the condensate enters the hot press pump 70. Medium-pressure steam (temperature 270-280℃, pressure 1.45MPa) enters the hot press pump 70 from the medium-pressure steam pipeline 50. Condensate flash steam and medium-pressure steam are ejected and mixed in the hot press pump 70. On the one hand, the temperature of the medium-pressure steam is reduced by the condensate flash steam, and on the other hand, the pressure is reduced by the hot press pump 70, so that the temperature of the final mixed fluid is 130±5℃ and the pressure is 0.1MPa. Then, the mixed fluid that meets the requirements is delivered to the extraction device 80 to provide a heat source for the first-effect falling film heat exchanger and the second-effect falling film heat exchanger installed in the extraction device 80. This reduces the amount of medium-pressure steam used and the amount of water consumed, thus saving water resources.

[0031] In one possible implementation of this utility model, a flash steam pipeline 30 is provided between the flash tank 20 and the autoclave 70 to facilitate flash steam transportation.

[0032] In one possible embodiment of this utility model, a first control valve 40 is installed on the flash steam pipeline 30; a second control valve 60 is installed on the medium-pressure steam pipeline 50. The first control valve 40 controls the flow rate of the condensate flash steam, and the second control valve 60 controls the flow rate of the medium-pressure steam, so that the temperature and pressure of the mixed fluid after jet mixing meet the heat source requirements of the extraction device 80.

[0033] Preferably, the first control valve 40 and the second control valve 60 are valves with flow control.

[0034] In one possible embodiment of this utility model, a third control valve 100 is provided between the flash tank 20 and the air-cooling device 90. The condensate is introduced into the air-cooling device 90 through the third control valve 100; at the same time, the condensate coming out of the bottom of the flash tank 20 can also be discharged to the condensate recovery tank 110 for storage and reuse.

[0035] See Figure 2In one possible embodiment of this utility model, the thermostatic pump 70 includes a pump housing 701, a first feed pipe 702, a second feed pipe 703, and a mixing jet pipe 704; the pump housing 701 is provided with a flow channel, which is a Venturi structure formed by a contraction section, a throat, and an expansion section connected sequentially along the material flow direction; the flash steam line 30 is connected to the contraction section through the first feed pipe 702; the medium-pressure steam line 50 is also connected to the contraction section through the second feed pipe 703; the expansion section is connected to the extraction device 80 through the mixing jet pipe 704.

[0036] See Figure 2 The first feed pipe 702, the second feed pipe 703 and the mixing jet pipe 704 are all arranged along the tangential direction of the pump housing 701; the first feed pipe 702 and the second feed pipe 703 are both located on the same side wall of the pump housing 701; the mixing jet pipe 704 is located on the other opposite side wall of the pump housing 701.

[0037] Specifically, to achieve the purpose of cooling and depressurization through ejector mixing of flash steam and medium-pressure steam, the pump casing 701 contains, from left to right, a flash steam feed chamber 705, a medium-pressure steam feed chamber 706, and a mixing chamber 707. The flash steam feed chamber 705 is composed of a cylindrical tube and a conical tube connected in sequence. The inner diameter of the conical tube gradually decreases from left to right along the axial direction of the pump casing 701. One end of the first feed pipe 702 is located outside the pump casing 701, and the other end of the first feed pipe 702 passes through the side wall of the pump casing 701 and extends into the cylindrical tube of the flash steam feed chamber 705. The conical end of the flash steam feed chamber 705 is located inside the medium-pressure steam feed chamber 706. The diameter of the flash steam feed chamber 705 is smaller than the diameter of the medium-pressure steam feed chamber 706. The medium-pressure steam feed chamber 706 is also an integral structure composed of cylindrical and conical tubes connected in sequence. The inner diameter of the conical tube gradually decreases from left to right along the axial direction of the pump housing 701, and the conical end of the medium-pressure steam feed chamber 706 is connected to the mixing chamber 707. One end of the second feed pipe 703 is located outside the pump housing 701, and the other end of the second feed pipe 703 extends into the medium-pressure steam feed chamber 706 through the side wall of the pump housing 701. The extension end of the second feed pipe 703 faces the side wall of the conical end of the flash steam feed chamber 705. The mixing chamber 707 includes a cylindrical tube and a conical tube, and the inner diameter of the conical tube gradually increases from left to right along the axial direction of the pump housing 701 to form a flared opening. One end of the mixing jet pipe 704 is located outside the pump housing 701, and the other end of the mixing jet pipe 704 extends through the side wall of the pump housing 701 and is connected to the flared end of the conical tube of the mixing chamber 707.

[0038] In this invention, the reduced diameter ends of the flash steam feed chamber 705 and the medium-pressure steam feed chamber 706 first form contraction sections. One end of the mixing chamber 707 connected to the medium-pressure steam feed chamber 706 is a throat, and the other end of the mixing chamber 707 is an expansion section. The sequentially connected contraction section, throat, and expansion section form a Venturi-structured flow channel within the pump housing 701. Specifically, the dimensions (length and angle, etc.) of the contraction section, throat, and expansion section are designed in conjunction with the parameters (flow rate, pressure, and temperature, etc.) of the flash steam and medium-pressure steam in the actual process. This design method is not within the scope of protection of this invention and will not be described in detail here. During operation, flash steam enters the flash steam feed chamber 705 tangentially from the first feed pipe 702, and medium-pressure steam enters the medium-pressure steam feed chamber 706 tangentially from the second feed pipe 703. After mixing, the flash steam and medium-pressure steam flow through the flow channel. Due to the Venturi structure, the flow velocity of the flash steam and medium-pressure steam increases sharply and the static pressure decreases when they pass through the throat. The high-speed flowing flash steam and medium-pressure steam form strong shear force and vortex at the throat, which promotes the rapid mixing of flash steam and medium-pressure steam to form a mixed fluid, improving the mixing effect. At the same time, the pressure and temperature of the medium-pressure steam drop rapidly, and the mixed fluid forms a jet that comes out from the mixing jet pipe 704. The mixed fluid that meets the requirements is transported to the extraction device 80 as the heat source for the first-effect falling film heat exchanger and the second-effect falling film heat exchanger.

[0039] In one possible embodiment of this invention, to better control the pressure of the mixed fluid after jet mixing, a flash steam pressure gauge P1 is installed on the flash steam pipeline 30; a medium-pressure steam pressure gauge P2 is installed on the medium-pressure steam pipeline 50; and a mixing pressure gauge P3 is installed between the thermostatic pump 70 and the extraction device 80. During operation, the opening degree of the first control valve 40 and / or the second control valve 60 is adjusted by monitoring the real-time pressure values ​​of the three pressure gauges, thereby controlling the flow rate of flash steam and / or medium-pressure steam.

[0040] In one possible embodiment of this invention, to better control the temperature of the mixed fluid after jet mixing, a flash steam thermometer T1 is installed on the flash steam pipeline 30; a medium-pressure steam thermometer T2 is installed on the medium-pressure steam pipeline 50; and a mixing thermometer T3 is installed between the thermostatic pump 70 and the extraction device 80. During operation, the opening degree of the first control valve 40 and / or the second control valve 60 is adjusted by the real-time temperature values ​​monitored by the three thermometers, thereby controlling the flow rate of flash steam and / or medium-pressure steam.

[0041] Preferably, for the adjustment of the first control valve 40 and / or the second control valve 60, the operator can manually adjust them by observing and monitoring the real-time pressure and / or real-time temperature values; alternatively, the monitored real-time pressure and / or real-time temperature signals can be transmitted to the DCS system for automatic adjustment. The DCS system is a well-known and mature technology in chemical production.

[0042] Preferably, the flash steam pressure gauge P1, flash steam thermometer T1, and first control valve 40 are sequentially arranged on the flash steam pipeline 30 along the material flow direction; the medium-pressure steam pressure gauge P2, medium-pressure steam thermometer T2, and second control valve 60 are sequentially arranged on the medium-pressure steam pipeline 50 along the material flow direction; and the mixing pressure gauge P3 and mixing thermometer T3 are sequentially arranged between the hot press pump 70 and the extraction device 80 along the material flow direction.

[0043] It should be noted that the normal transport of materials such as medium-pressure steam, flash steam, and mixed fluids between various devices is a mature technology in this field. For example, transfer pumps are used to achieve material transport.

[0044] It should be noted that the equipment in this utility model (flash tank, pipelines, valves, thermometers, and pressure gauges, etc.) are all commercially available equipment in the field, and these devices can all meet the process technical requirements for pressure, temperature, etc. during operation. Furthermore, the installation and connection methods of each piece of equipment, connecting pipeline and valve, as well as the valve control methods, are all conventional and known technologies in the field, and will not be described in detail here.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A system for the integrated utilization of medium-pressure steam and condensate flash steam, characterized in that, It includes a flash tank (20), a medium-pressure steam pipeline (50), a hot press pump (70), an extraction device (80), and an air cooling device (90); The flash tank (20) is connected to the hot press pump (70) and the air cooling device (90) respectively; the hot press pump (70) is also connected to the medium-pressure steam pipeline (50) and the extraction device (80) respectively.

2. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 1, characterized in that, A flash steam line (30) is provided between the flash tank (20) and the autoclave pump (70).

3. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 2, characterized in that, A first control valve (40) is installed on the flash steam pipeline (30); a second control valve (60) is installed on the medium-pressure steam pipeline (50).

4. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 2, characterized in that, A flash steam pressure gauge (P1) is installed on the flash steam pipeline (30); a medium-pressure steam pressure gauge (P2) is installed on the medium-pressure steam pipeline (50); and a mixing pressure gauge (P3) is installed between the hot press pump (70) and the extraction device (80).

5. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 2, characterized in that, A flash steam thermometer (T1) is installed on the flash steam pipeline (30); a medium-pressure steam thermometer (T2) is installed on the medium-pressure steam pipeline (50); and a mixing thermometer (T3) is installed between the hot press pump (70) and the extraction device (80).

6. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 1, characterized in that, The integrated utilization system for medium-pressure steam and condensate flash steam also includes a condensate pipeline (10) connected to the flash tank (20).

7. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 2, characterized in that, The thermostatic pump (70) includes a pump housing (701), a first feed pipe (702), a second feed pipe (703), and a mixing jet pipe (704); the pump housing (701) is provided with a flow channel, which is a Venturi structure formed by a contraction section, a throat, and an expansion section connected sequentially along the material flow direction; the flash steam line (30) is connected to the contraction section through the first feed pipe (702); the medium-pressure steam line (50) is also connected to the contraction section through the second feed pipe (703); the expansion section is connected to the extraction device (80) through the mixing jet pipe (704).

8. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 7, characterized in that, The first feed pipe (702), the second feed pipe (703), and the mixing jet pipe (704) are all arranged along the tangential direction of the pump housing (701); The first feed pipe (702) and the second feed pipe (703) are both located on the same side wall of the pump housing (701); the mixing jet pipe (704) is located on the other opposite side wall of the pump housing (701).

9. The integrated utilization system for medium-pressure steam and condensate flash steam according to claim 1, characterized in that, A third control valve (100) is provided between the flash tank (20) and the air cooling device (90).

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