Low-pressure steam exhaust recovery system and operation method thereof

Abstract

According to the low-pressure steam dead steam recovery system and the operation method thereof, a dead steam collection module of the low-pressure steam dead steam recovery system utilizes branch collection pipelines to be matched with flow and pressure adjustment sensing devices, and dead steam discharged by different devices can be collected; a cyclone separator, a gravity settling chamber and a wire mesh demister in the steam-water separation module act in sequence, so that moisture in steam can be thoroughly removed; a steam compressor of the pressurization module is combined with a pressure sensor and a temperature sensor at an inlet to effectively pressurize steam; an absorption heat pump and a steam-steam heat exchanger of the heat energy improving module are matched with each other, dead steam energy is fully excavated, and the heat energy grade is improved; the recycling module can accurately supply steam according to the requirements of different steam using terminals through adjusting valves on branch pipelines, the energy utilization efficiency is greatly improved through the whole system, the energy cost of enterprises is reduced, heat pollution and harmful substance emission caused by direct exhaust steam emission are reduced, and the energy utilization efficiency of the enterprises is improved. And energy conservation, emission reduction and sustainable development of industrial production are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of waste steam recovery, and particularly to a low-pressure steam waste steam recovery system and its operation method. Background Art

[0002] In the industrial production process, steam, as a widely used energy carrier, is utilized by numerous steam-using devices. However, the low-pressure steam waste generated after these devices use steam has long been a difficult problem in the field of industrial energy utilization.

[0003] Traditionally, most of the low-pressure steam waste is often directly discharged into the atmosphere. This not only causes a large amount of heat energy to be wasted in vain. According to relevant statistics, in some high-energy-consuming industrial fields, the heat energy lost due to the direct discharge of waste steam each year is equivalent to the combustion heat of a large amount of standard coal, greatly reducing the energy utilization efficiency and increasing the energy cost of enterprises. At the same time, the direct discharge of waste steam will also have a negative impact on the environment. The discharge of high-temperature waste steam may cause local thermal pollution, and the small amount of harmful substances carried in it will also cause a certain degree of pollution to the atmospheric environment.

[0004] Although some enterprises have tried to simply recycle waste steam, the existing recycling systems generally have many problems. For example, in the waste steam collection link, there is a lack of effective adjustment means and it is impossible to accurately control according to the waste steam discharge conditions of different steam-using devices, resulting in low collection efficiency. In terms of steam-water separation, the separation effect of traditional separation devices is not good, and it is difficult to completely remove the moisture in the steam, affecting the quality and utilization efficiency of the subsequent steam. In the waste steam pressurization and heat energy enhancement links, the technical means are limited, and it is impossible to fully enhance and utilize the energy of the waste steam, making the recycled steam difficult to meet the diverse steam usage requirements of enterprises.

[0005] In summary, the existing low-pressure steam waste steam recycling methods have problems such as serious energy waste, large environmental impact, and insufficient performance of the recycling system. There is an urgent need for a low-pressure steam waste steam recycling system that is efficient, intelligent, and can comprehensively improve the recycling value of waste steam. Summary of the Invention

[0006] The purpose of the present invention is to provide a low-pressure steam waste steam recovery system to achieve the efficient recovery and reuse of low-pressure steam waste steam.

[0007] The present invention provides a low-pressure steam waste steam recovery system, including: a control system and a waste steam collection module, a steam-water separation module, a pressurization module, a heat energy enhancement module, and a reuse module that are connected in sequence. The waste steam collection module, the steam-water separation module, the pressurization module, the heat energy enhancement module, and the reuse module are all communicatively connected to the control system;

[0008] The waste steam collection module includes a main collection pipeline and multiple branch collection pipelines. Each branch collection pipeline is respectively connected to the waste steam discharge port of a different steam-using device. A first flow regulating valve and a first pressure sensor are provided on each branch collection pipeline. The multiple branch collection pipelines converge into the main collection pipeline, and an electric stop valve is arranged on the main collection pipeline;

[0009] The steam-water separation module is communicated with the main collection pipeline of the waste steam collection module. The steam-water separation module includes a cyclone separator, a gravity settling chamber, and a wire mesh demister that are communicated in sequence. A condensate discharge port communicated with a condensate recovery pipeline is arranged at the bottom of the steam-water separation module, and a liquid level control valve is installed at the condensate discharge port;

[0010] The pressurization module is connected after the steam-water separation module and includes a steam compressor. A second pressure sensor and a temperature sensor are arranged at the inlet of the steam compressor;

[0011] The heat energy enhancement module includes an absorption heat pump and a steam-steam heat exchanger; the first heat exchange side of the steam-steam heat exchanger is communicated with the pressurization module, and the second heat exchange side of the steam-steam heat exchanger is communicated with the absorption heat pump;

[0012] The reuse module is communicated with the heat energy enhancement module. The reuse module includes multiple steam-using terminals. A branch pipeline is arranged between each steam-using terminal and the heat energy enhancement unit, and a pressure regulating valve, a temperature regulating valve, and a flow regulating valve are arranged on each branch pipeline.

[0013] Further, one-way check valves are provided on each branch collection pipeline of the waste steam collection module.

[0014] Further, the inner surfaces of the main collection pipe and each branch collection pipe are coated with a drag reduction coating.

[0015] Further, spiral guide vanes are arranged inside the cyclone separator, multiple inclined baffles are arranged at intervals along the steam flow direction inside the gravity settling chamber, and the wire mesh demister includes multiple layers of wire meshes, and a hydrophilic layer is provided on each layer of wire mesh.

[0016] Further, the internal space of the gravity settling chamber is in an inverted conical structure.

[0017] Further, multiple-stage compression chambers are arranged inside the compressor, and an intermediate cooler is arranged between every two adjacent compression chambers. The intermediate cooler includes heat dissipation fins, and a cooling fan is installed at a position corresponding to the heat dissipation fins.

[0018] Further, the control system adopts a fuzzy control algorithm, comprehensively considers multiple operating parameters, conducts coordinated control on each module, and optimizes the overall performance of the recovery device.

[0019] Furthermore, the outer sides of both the main collection pipeline and the branch collection pipelines are coated with heat insulation layers.

[0020] An operation method of a low-pressure steam waste steam recovery system includes the following steps:

[0021] S1: Waste steam collection step: Collect waste steam discharged from different steam-using devices through each branch collection pipeline. The control system adjusts the opening degree of the corresponding first flow regulating valve according to the data of the first pressure sensors on each branch collection pipeline, so that the waste steam flow rate and pressure of each branch collection pipeline reach balance and are aggregated into the main collection pipeline;

[0022] S2: Steam-water separation step: The waste steam in the main collection pipeline enters the steam-water separation module and undergoes steam-water separation through a cyclone separator, a gravity settling chamber, and a wire mesh demister in sequence. The control system controls the opening and closing of the condensate discharge port according to the liquid level information fed back by the liquid level control valve, and discharges the separated condensate into the condensate recovery pipeline;

[0023] S3: Waste steam boosting step: The steam after steam-water separation enters the boosting module. The control system adjusts the operating parameters of the steam compressor according to the data of the second pressure sensor and the temperature sensor at the inlet of the steam compressor to boost the steam;

[0024] S4: The boosted steam enters the first heat exchange side of the steam-steam heat exchanger and exchanges heat with the heat medium from the absorption heat pump on the second heat exchange side to increase the thermal energy of the steam. The control system adjusts the operating parameters of the absorption heat pump and the steam-steam heat exchanger according to the requirements of the reuse module;

[0025] S5: The steam with increased thermal energy enters the reuse module and is transported to different steam-using terminals through each branch pipeline. The control system adjusts the opening degree of each regulating valve according to the data fed back by the pressure regulating valve, temperature regulating valve, and flow regulating valve on each branch pipeline to meet the requirements of each steam-using terminal for steam pressure, temperature, and flow rate.

[0026] Furthermore, in step S3: The steam compressor is equipped with a variable frequency speed regulation drive device, which automatically adjusts the rotation speed of the steam compressor according to the pressure and temperature parameters of the steam and the subsequent recovery and utilization requirements to accurately boost the pressure of the waste steam.

[0027] The beneficial effects of this technical solution are as follows: The waste steam collection module uses branch collection pipelines in combination with flow and pressure regulation sensing devices, which can accurately collect the waste steam discharged by different devices, ensuring a stable and efficient collection process; the cyclone separator, gravity settling chamber, and wire mesh demister in the steam-water separation module act in sequence, which can completely remove the moisture in the steam and provide high-quality steam for subsequent processes; the steam compressor in the pressurization module, combined with the pressure and temperature sensors at the inlet, realizes effective pressurization of the steam; the absorption heat pump and steam-steam heat exchanger in the heat energy enhancement module cooperate with each other to fully exploit the energy of the waste steam and improve its heat energy level; the reuse module can accurately supply steam according to the needs of different steam-using terminals through the regulating valves on each branch pipeline. The overall system not only greatly improves the energy utilization efficiency, reduces the enterprise's energy costs, but also reduces the thermal pollution and harmful substance emissions caused by the direct discharge of waste steam, effectively promoting energy conservation, emission reduction, and sustainable development in industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0030] Description of the reference numerals: 1 - waste steam collection module, 2 - steam-water separation module, 3 - pressurization module, 4 - heat energy enhancement module, 5 - reuse module, 201 - cyclone separator, 202 - gravity settling chamber, 203 - wire mesh demister, 401 - steam-steam heat exchanger, 402 - absorption heat pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will clearly and completely describe the technical solutions of the present invention in combination with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined. In addition, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] As Figure 1 shown, the present invention provides a low-pressure steam waste steam recovery system, which includes a waste steam collection module 1, a steam-water separation module 2, a pressurization module 3, a heat energy enhancement module 4, a reuse module 5, and a control system that are connected in sequence. The waste steam collection module 1, the steam-water separation module 2, the pressurization module 3, the heat energy enhancement module 4, and the reuse module 5 are all communicatively connected to the control system;

[0035] The waste steam collection module 1 includes a main collection pipeline and multiple branch collection pipelines. Each of the branch collection pipelines is respectively connected to the waste steam discharge ports of different steam-using devices. A first flow regulating valve and a first pressure sensor are provided on each branch collection pipeline. The collection pipeline is made of a composite material that is resistant to high temperatures, corrosion, and has good heat insulation performance, which can effectively reduce heat loss. The multiple branch collection pipelines converge to the main collection pipeline, and an electric stop valve is provided on the main collection pipeline to control the overall waste steam collection path and ensure that the waste steam collection can be cut off during system failures or maintenance. One-way check valves are provided on each branch collection pipeline of the waste steam collection module 1 to prevent waste steam backflow. The inner surfaces of the main collection pipe and each of the branch collection pipes are coated with a drag reduction coating, which can reduce the flow resistance of the waste steam in the pipeline and improve the collection efficiency.

[0036] The steam-water separation module 2 is connected to the main collection pipeline of the exhausted steam collection module 1, and includes a cyclone separator 201, a gravity settling chamber 202, and a wire mesh demister 4 in sequence. The cyclone separator 201 uses centrifugal force to preliminarily separate steam and water in the exhausted steam, and is internally provided with spiral guide vanes to enhance the centrifugal separation effect. The gravity settling chamber 202 is provided with a plurality of inclined baffles at intervals along the steam flow direction to further separate the preliminarily separated exhausted steam, and the water droplets settle under the action of gravity by reducing the flow rate. Moreover, the internal space of the gravity settling chamber 202 has an inverted conical structure. The wire mesh demister 4 is used to capture the remaining tiny water droplets, adopts a multi-layer stainless steel wire mesh structure, and the surface of the wire mesh is subjected to special hydrophilic treatment to improve the demisting efficiency. A condensate discharge port communicating with the condensate recovery pipeline is provided at the bottom of the steam-water separation module 2, and a liquid level control valve is installed at the condensate discharge port to automatically control the condensate discharge according to the liquid level in the separation module.

[0037] The pressurization module 3 is connected after the steam-water separation module 2, and includes a steam compressor. The steam compressor should have a variable frequency speed regulation function and can automatically adjust the compression ratio according to the pressure demand of the recovery system. A second pressure sensor and a temperature sensor are provided at the inlet of the steam compressor to monitor the pressure and temperature parameters of the exhausted steam in real time and feedback to the control system to adjust the operating state of the compressor. Moreover, a multi-stage compression chamber is provided inside the compressor, and an intercooler is provided between each compression chamber. The intercooler includes heat dissipation fins, and a cooling fan is installed corresponding to the position of the heat dissipation fins to reduce the steam temperature during the compression process and improve the compression efficiency. The compressor is equipped with a variable frequency speed regulation drive device, which automatically adjusts the speed of the compressor according to parameters such as the pressure and temperature of the steam and the subsequent recovery and utilization requirements to accurately increase the pressure of the exhausted steam.

[0038] The thermal energy enhancement module 4 includes an absorption heat pump 402 and a steam-steam heat exchanger 401. The first heat exchange side of the steam-steam heat exchanger 401 is connected to the pressurization module 3, and the second heat exchange side of the steam-steam heat exchanger 401 is connected to the absorption heat pump 402. The pressurized steam enters the first heat exchange side of the steam-steam heat exchanger 401 and exchanges heat with the heat medium from the absorption heat pump 402 on the second heat exchange side to enhance the thermal energy of the steam. The generator, absorber, evaporator, and condenser of the absorption heat pump 402 are connected by pipelines, and flow control valves and temperature sensors are provided on each pipeline to accurately control the operation of the heat pump according to the thermal energy demand of the system.

[0039] The reuse module 5 is connected to the thermal energy enhancement module 4. The reuse module 5 includes a plurality of steam-using terminals, and branch pipelines are provided between each steam-using terminal and the thermal energy enhancement unit. A pressure control valve, a temperature control valve, and a flow control valve are provided on each branch pipeline. The steam whose thermal energy has been enhanced enters the reuse module 5 and is transported to different steam-using terminals through each branch pipeline.

[0040] The control system in this solution is connected to the sensors, valves, and equipment in the exhaust steam collection module 1, steam-water separation module 2, pressurization module 3, heat energy enhancement module 4, and reuse module 5. The control system uses a fuzzy control algorithm, comprehensively considers multiple operating parameters, and collaboratively controls each module to optimize the overall performance of the recovery system. The controllable system is configured to: adjust the opening degree of the corresponding first flow regulating valve according to the data of the first pressure sensor on each branch collection pipeline to balance the exhaust steam flow and pressure in each branch collection pipeline; control the condensate discharge according to the liquid level information fed back by the liquid level control valve in the steam-water separation module 2; adjust the operating parameters of the steam compressor according to the data of the second pressure sensor and temperature sensor at the inlet of the steam compressor; and adjust the operating parameters of the heat energy enhancement module 4 according to the data fed back by the pressure regulating valve, temperature regulating valve, and flow regulating valve on each steam-using terminal branch pipeline to meet the requirements of each steam-using terminal.

[0041] An operating method for a low-pressure steam exhaust steam recovery system is as follows:

[0042] Suppose there are three steam-using devices A, B, and C. A large amount of low-pressure steam exhaust is generated during the operation of the three devices. The exhaust ports of the three devices are respectively connected to different branch collection pipelines of the exhaust steam collection module 1. During operation, the first pressure sensor real-time monitors the pressure data in each branch collection pipeline and transmits the data to the control system. For example, when the steam consumption of device A suddenly increases, resulting in an increase in its exhaust steam pressure, the control system automatically adjusts the opening degree of the corresponding first flow regulating valve according to the data fed back by the first pressure sensor on this branch collection pipeline, allowing more exhaust steam to flow into the main collection pipeline to balance the pressure in each branch pipeline. At the same time, the electric stop valve on the main collection pipeline is in the normally open state to ensure the smooth collection of exhaust steam. However, when the pressure of the main collection pipeline abnormally increases and exceeds the safety threshold, the electric stop valve quickly closes under the command of the control system to prevent danger.

[0043] The exhaust steam coming from the main collection pipeline enters the steam-water separation module 2. First, it enters the cyclone separator 201, where the internal spiral guide vanes cause the exhaust steam to rotate at high speed. Under the action of centrifugal force, most of the moisture is thrown towards the inner wall of the separator and flows downward. Then, the exhaust steam enters the gravity settling chamber 202. Due to its inverted conical internal space design, the steam flow rate slows down, and the condensate quickly settles to the bottom under the action of gravity. Finally, after passing through the wire mesh demister 4, the multi-layer stainless steel wire mesh further filters out the tiny water droplets remaining in the steam to ensure that the steam entering the subsequent module has high quality. The separated condensate is discharged into the condensate recovery pipeline in a timely manner through the liquid level control valve according to the liquid level condition at the bottom of the steam-water separation module 2.

[0044] The steam that has undergone steam-water separation enters the steam compressor of the pressurization module 3. The second pressure sensor and temperature sensor at the inlet of the steam compressor monitor the pressure and temperature of the steam in real time. If the steam pressure is low, the control system adjusts the operating parameters such as the rotational speed of the steam compressor according to the sensor data to increase the steam pressure and meet the requirements of the subsequent heat energy enhancement and reuse module 5 for the steam pressure. When the temperature and pressure at the inlet of the steam compressor exceed the set safety range, the control system immediately issues an alarm and takes corresponding measures, such as adjusting the operating state of the compressor or stopping it, to ensure the safety of the equipment.

[0045] The pressurized steam enters the first heat exchange side of the steam-steam heat exchanger 401 and exchanges heat with the heat medium from the absorption heat pump 402 on the second heat exchange side. For example, the absorption heat pump 402 utilizes other waste heat resources in the factory to heat up the heat medium and send it into the steam-steam heat exchanger 401, further enhancing the heat energy of the steam. The control system flexibly adjusts the operating parameters of the absorption heat pump 402 and the steam-steam heat exchanger 401 according to the demand feedback of each steam-using terminal in the reuse module 5 to ensure that the output steam has appropriate heat energy.

[0046] The steam whose heat energy has been enhanced is transported to each steam-using terminal through branch pipelines. The pressure regulating valve, temperature regulating valve, and flow regulating valve on each branch pipeline precisely regulate the pressure, temperature, and flow rate of the steam according to the actual demands of the steam-using terminal. For example, when equipment C requires steam at a higher temperature, the control system receives the data fed back by the temperature sensor on this branch pipeline and adjusts the opening degrees of the temperature regulating valve and other relevant regulating valves to allow more high-temperature steam to enter equipment C, achieving the efficient utilization of steam. At the same time, according to the actual steam usage conditions of each steam-using terminal, the control system dynamically adjusts the opening degrees of the regulating valves on each branch pipeline to achieve the precise distribution of steam.

[0047] During the entire operation process, the control system monitors the operating states of each module in real time and precisely adjusts the operating parameters of each device and valve according to the data fed back by each sensor to achieve the efficient recovery and reuse of exhaust steam.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-pressure steam exhaust recovery system, characterized in that: include: A control system and a spent steam collection module, a steam-water separation module, a pressurizing module, a heat energy enhancement module and a recycling module which are sequentially connected, wherein the spent steam collection module, the steam-water separation module, the pressurizing module, the heat energy enhancement module and the recycling module are all in communication connection with the control system; The exhaust steam collection module includes a main collection pipeline and multiple branch collection pipelines, each of the branch collection pipelines is respectively connected to the exhaust steam discharge port of different steam-using equipment, each of the branch collection pipelines is provided with a first flow regulating valve and a first pressure sensor, and multiple branch collection pipelines are collected to the main collection pipeline, and the main collection pipeline is provided with an electric stop valve; The steam-water separation module is connected to the main collection pipeline of the exhaust steam collection module. The steam-water separation module includes a cyclone separator, a gravity settling chamber and a wire mesh demister which are connected in sequence. A condensate discharge port connected to the condensate recovery pipeline is provided at the bottom of the steam-water separation module. A liquid level control valve is installed at the condensate discharge port. The boosting module is connected after the steam-water separation module and comprises a steam compressor, and a second pressure sensor and a temperature sensor are arranged at the inlet of the steam compressor; The thermal energy enhancement module includes an absorption heat pump and a steam-steam heat exchanger; a first heat exchange side of the steam-steam heat exchanger is connected to the boosting module, and a second heat exchange side of the steam-steam heat exchanger is connected to the absorption heat pump; The recycling module is connected to the thermal energy enhancement module, and the recycling module includes multiple steam terminals. A branch pipeline is arranged between each steam terminal and the thermal energy enhancement unit, and each branch pipeline is provided with a pressure regulating valve, a temperature regulating valve and a flow regulating valve.

2. The low-pressure steam exhaust recovery system according to claim 1, characterized in that: Each branch collecting pipeline of the exhaust steam collecting module is provided with a one-way check valve.

3. The low-pressure steam exhaust recovery system according to claim 1, characterized in that: The inner surfaces of the main collecting pipe and each of the branch collecting pipes are coated with a drag reducing coating.

4. The low-pressure steam exhaust recovery system according to claim 1, characterized in that: The cyclone separator is provided with spiral guide vanes inside, the gravity settling chamber is provided with a plurality of inclined baffles at intervals along the steam flow direction, and the wire mesh demister comprises multiple layers of wire mesh, each layer of which is provided with a hydrophilic layer.

5. The low-pressure steam exhaust recovery system according to claim 4, characterized in that: The internal space of the gravity sedimentation chamber is in an inverted cone structure.

6. The low-pressure steam exhaust recovery system according to claim 1, characterized in that: The compressor is provided with multiple compression chambers inside, and an intercooler is provided between every two adjacent compression chambers. The intercooler includes heat dissipation fins, and a cooling fan is installed at the position corresponding to the heat dissipation fins.

7. The low-pressure steam exhaust recovery system according to claim 1, characterized in that: The control system adopts a fuzzy control algorithm, comprehensively considers multiple operating parameters, and performs coordinated control on each module.

8. The low-pressure steam exhaust recovery system according to claim 1, characterized in that: The outer side of the main collecting pipe and the outer side of the branch collecting pipe are both covered with a heat-insulating layer.

9. An operating method of the low-pressure steam exhaust recovery system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Exhaust steam collection step: exhaust steam discharged from different steam-using equipment is collected through each branch collection pipeline, and the control system adjusts the opening of the corresponding first flow regulating valve according to the data of the first pressure sensor on each branch collection pipeline, so that the exhaust steam flow and pressure of each branch collection pipeline are balanced and collected to the main collection pipeline; S2: Steam-water separation step: the exhaust steam in the main collection pipeline enters the steam-water separation module, and passes through the cyclone separator, gravity settling chamber and wire mesh demister in sequence for steam-water separation. The control system controls the opening and closing of the condensate discharge port according to the liquid level information fed back by the liquid level control valve, and discharges the separated condensate into the condensate recovery pipeline; S3: Exhaust steam pressurization step: The steam after steam-water separation enters the pressurization module, and the control system adjusts the operating parameters of the steam compressor according to the data of the second pressure sensor and the temperature sensor at the inlet of the steam compressor to pressurize the steam; S4: The pressurized steam enters the first heat exchange side of the steam-steam heat exchanger and exchanges heat with the heat medium from the absorption heat pump on the second heat exchange side to increase the thermal energy of the steam. The control system adjusts the operating parameters of the absorption heat pump and the steam-steam heat exchanger according to the needs of the reuse module. S5: The steam after thermal energy enhancement enters the recycling module and is transported to different steam-using terminals through branch pipelines. The control system adjusts the opening of each regulating valve according to the feedback data from the pressure regulating valve, temperature regulating valve and flow regulating valve on each branch pipeline to meet the requirements of each steam-using terminal for steam pressure, temperature and flow.

10. The operating method of the low-pressure steam exhaust steam recovery system according to claim 9, characterized in that: In step S3: the steam compressor is equipped with a variable frequency speed regulating drive device, which automatically adjusts the speed of the steam compressor according to the pressure and temperature parameters of the steam and the back-end recycling requirements.

Images