CN118089090A - Primary network residual pressure energy recovery system and method of primary heat wharf selling system - Google Patents
Primary network residual pressure energy recovery system and method of primary heat wharf selling system Download PDFInfo
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- CN118089090A CN118089090A CN202410420518.4A CN202410420518A CN118089090A CN 118089090 A CN118089090 A CN 118089090A CN 202410420518 A CN202410420518 A CN 202410420518A CN 118089090 A CN118089090 A CN 118089090A
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- 238000011084 recovery Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 230000001105 regulatory effect Effects 0.000 claims abstract description 49
- 230000005611 electricity Effects 0.000 claims description 9
- 238000010248 power generation Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000013138 pruning Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention relates to a primary network residual pressure energy recovery system and a method of a primary heat wholesale system, wherein the system comprises the primary heat wholesale system, the residual pressure energy recovery system and a controller; the primary heat wholesale system comprises a wholesale primary water supply pipeline and a wholesale primary water return pipeline which are connected with the main pipeline of the outlet of the relay pump station in parallel, wherein the wholesale primary water return pipeline is connected with at least two bypasses in parallel, and the bypass positioned at the outermost side is provided with a residual pressure energy recovery system; the residual pressure energy recovery system comprises a water turbine generator set; the bypass is provided with an electric regulating valve and a manual gate valve, and the controller is electrically connected with the electric regulating valve and can control the opening of the electric regulating valve; the invention avoids the increase of the number of the primary reverse pressure difference heat exchange stations and the time of the reverse pressure difference caused by the reduction of the pressure difference of the water supply and return, and improves the hydraulic balance effect of the whole network.
Description
Technical Field
The invention belongs to the technical field of heat supply waste heat and residual pressure energy recovery, and particularly relates to a primary network residual pressure energy recovery system and method of a primary heat wharf selling system.
Background
The industrial electricity accounts for about 70% of the total national electricity consumption, wherein the electricity consumption of the industrial circulating water system accounts for 40% -50%, and a large amount of residual pressure energy exists in the industrial circulating water system in China and is not utilized. For a large-scale heating system, the municipal heating pipe network generally has the condition that the primary utilization pressure head of a heat exchange station is too high after the front end and a relay pump station, the current operation mode basically adopts an electric regulating valve to consume the pressure head, and the rest part consumes in a primary network hydraulic coupling mode, so that not only is the energy wasted, but also the hydraulic balance effect of the pipe network is affected, and the number of primary 'reverse pressure difference' heat exchange stations and the reverse pressure difference time are increased.
With the acceleration of the urban process and the continuous increase of heat supply demands, the energy efficiency problem of the large-scale heat supply system is increasingly prominent. In a heating system, the problem of waste of the residual pressure energy of the primary network is particularly serious, which not only causes the waste of the energy, but also reduces the available pressure difference of the main pipe network, and influences the stable operation of the heating system. Therefore, research and development of an effective residual pressure energy recovery system have important significance for improving the energy efficiency and economic benefit of a heating system.
Disclosure of Invention
The invention solves the technical problems by adopting the following technical scheme:
The system comprises a primary heat wholesale system, a residual pressure energy recovery system and a controller;
The primary heat wholesale system comprises a wholesale primary water supply pipeline and a wholesale primary water return pipeline which are connected with the main pipeline of the outlet of the relay pump station in parallel, wherein the wholesale primary water return pipeline is connected with at least two bypasses in parallel, and the bypass positioned at the outermost side is provided with a residual pressure energy recovery system; the residual pressure energy recovery system comprises a water turbine generator set;
And the bypass is provided with an electric regulating valve and a manual gate valve, and the controller is electrically connected with the electric regulating valve and can control the opening of the electric regulating valve.
Further, the wholesale heat meter is installed on the wholesale primary water return pipeline connected with the bypass, and the wholesale heat meter is located at the upstream of the bypass.
Further, the normally closed manual gate valve is arranged on the wholesale primary water return pipeline connected with the bypass, so that water flow of the wholesale primary water return pipeline passes through the bypass.
Further, a bypass for installing the residual pressure energy recovery system is provided with a flowmeter.
Further, the number of the branches is two, namely a first branch and a second branch, the residual pressure energy recovery system is arranged on the first branch, and the connection port of the second branch and the water return pipeline sold once is positioned at the inner side of the connection port of the first branch and the water return pipeline sold once.
Further, a temperature sensor and a vibration sensor are also arranged on a bypass provided with the residual pressure energy recovery system, and the temperature sensor and the vibration sensor are both connected with the controller circuit.
Further, the hydraulic turbine also comprises a rotating speed sensor, wherein the rotating speed sensor acquires the rotating speed of the hydraulic turbine and transmits the acquired rotating speed to the controller.
A primary network residual pressure energy recovery method of a primary heat wharf selling system comprises the following steps:
When the hydroelectric generating set is used for generating electricity, the electric regulating valve on the branch where the non-hydroelectric generating set is located is slowly turned off, the electric regulating valve on the branch where the hydroelectric generating set is located is slowly turned on, the hydraulic turbine and the generator shaft start to rotate, the electric regulating valve on the branch where the non-hydroelectric generating set is located is continuously turned off, when the rotating speed of the hydraulic turbine is detected to reach a set value, the generator is turned on, then the electric regulating valve on the branch where the hydroelectric generating set is located is continuously turned on under the condition that the rated flow of the hydraulic turbine is not exceeded, and the generating power is gradually increased; if the wholesale flow is larger than the rated flow of the water turbine, after the rated flow of the water turbine is reached, adjusting an electric regulating valve on a branch where the non-water-turbine generator set is located, so that the rest flow passes through the branch; if the wholesale flow is smaller than the rated flow of the water turbine, closing an electric regulating valve on a branch where the non-hydroelectric generating set is located.
When the hydroelectric generating set stops generating, the electric regulating valve on the branch where the hydroelectric generating set is located is slowly closed, meanwhile, the electric regulating valve on the branch where the non-hydroelectric generating set is located is slowly opened, when the rotation speed of the water turbine is detected to be reduced to a set value, the motor is closed, the power generation is stopped, and then the electric regulating valve on the branch where the hydroelectric generating set is located is completely closed.
The invention has the advantages and positive effects that:
1. Compared with the traditional heating system, the invention has obvious advantages; firstly, the system can effectively recycle and utilize the residual pressure energy in the primary network, thereby avoiding the waste of energy; secondly, by optimizing the regulating strategy of the electric regulating valve, the backwater pressure is reduced, the available pressure difference of the main pipe network is improved, and the stable operation of a heating system is facilitated; finally, the system also has remote monitoring and control functions, so that operation and maintenance personnel can conveniently perform remote operation and maintenance;
2. The primary network residual pressure energy recovery and primary heat wholesale system provided by the invention are combined, the primary network residual pressure energy utilization and wholesale safe operation of the peak shaving station are realized, the rising of the return water pressure of the main network caused by the overhigh return water pressure of the peak shaving station can be avoided under the condition that the heat supply wholesale operation working condition is met, the increase of the number of primary 'reverse pressure difference' heat exchange stations and the 'reverse pressure difference' time caused by the reduction of the supply return water pressure difference is avoided, and the hydraulic balance effect of the whole network is improved.
Drawings
The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a primary thermal wholesale system, a relay pump station and a main pipeline according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a primary net residual pressure energy recovery system of a primary thermal wholesale system according to an embodiment of the present invention.
Detailed Description
First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present invention will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implied in the embodiments mentioned herein, or any single feature shown or implied in the figures, may nevertheless be continued in any combination or pruning between these features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity of the drawing, identical or similar features may be indicated at one point in the same drawing.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
Example 1
As shown in fig. 1, the primary network residual pressure energy recovery system of the primary heat wholesale system provided in this embodiment includes a primary heat wholesale system Q, a residual pressure energy recovery system and a controller;
The primary heat wholesale system comprises a wholesale primary water supply pipeline M and a wholesale primary water return pipeline N which are connected with an outlet main pipeline of the relay pump station D in parallel, wherein at least two bypasses are connected in parallel on the wholesale primary water return pipeline, and a residual pressure energy recovery system is arranged on the bypass positioned at the outermost side; the residual pressure energy recovery system comprises a hydroelectric generating set P, wherein the hydroelectric generating set comprises a water turbine, a generator and a grid-connected cabinet O, the generator is connected with the grid-connected cabinet through a cable, the grid-connected cabinet is connected with the low-voltage side of the transformer, and the power grid is automatically integrated;
And the bypass is provided with an electric regulating valve and a manual gate valve, and the controller is electrically connected with the electric regulating valve and can control the opening of the electric regulating valve.
In order to monitor the wholesale flow, the wholesale heat meter is installed on the wholesale primary water return pipeline connected with the bypass, and the wholesale heat meter is positioned at the upstream of the bypass and used for reading primary water return main pipe flow and scheduling the wholesale flow, guaranteeing the wholesale safety production, and in order to be capable of being controlled remotely, the wholesale heat meter can be considered to be connected with a controller through a circuit, and the controller can adjust the opening of an electric regulating valve on the bypass by obtaining data of the wholesale heat meter 5.
In this embodiment, it may be considered that the two branches are a first branch a and a second branch B, the residual pressure energy recovery system is installed on the first branch, and the connection port of the second branch and the wholesale primary water return pipeline is located at the inner side of the connection port of the first branch and the wholesale primary water return pipeline, that is, the water inlet end of the branch provided with the residual pressure energy recovery system is located at the upstream of the primary water return pipeline compared with the water inlet ends of the other branches; in order to facilitate the regulation of the branch flow rate during the recovery of the residual pressure energy, the wholesale primary water return pipeline is provided with a normally closed manual gate valve 6, and the purpose of the manual gate valve is to enable the water flow of the wholesale primary water return pipeline to bypass, so that the installation position of the manual gate valve is on the wholesale primary water return pipeline between the water inlet and the water outlet of the branch; in order to monitor the practical flow of the water turbine, the system is used for detecting the operation condition of the system, ensuring the safe operation of the system, observing the flow passing through the residual pressure energy recovery system at any time, and arranging a flowmeter 7 on a bypass provided with the residual pressure energy recovery system, wherein the flowmeter is connected with a controller; in addition, in order to measure the bearing temperature of the water turbine and monitor the vibration condition of the water turbine at any time, it can be considered that a temperature sensor and a vibration sensor are further installed on a bypass of the residual pressure energy recovery system, the vibration sensor should be arranged on a shaft neck and a wheel disc of the water turbine unit so as to monitor the vibration condition of a rotor, the temperature sensor and the vibration sensor are both in circuit connection with the controller 8, the controller is installed in a control cabinet, the control cabinet is connected with a central control room, meanwhile, the control cabinet is also in circuit connection with a main cable of the water turbine power generation, and the specific connection mode belongs to electrical conventional connection, belongs to common knowledge and is not repeated here.
Since the hydraulic generator has a rated flow rate and therefore a certain limit to its rotational speed, in this embodiment, a rotational speed sensor is further included, which acquires the rotational speed of the hydraulic turbine and transmits the acquired rotational speed to the controller.
Specifically, as shown in fig. 2, a first electric regulating valve 1 and a first manual gate valve 2 are arranged on a first branch A, a second electric regulating valve 3 and a second manual gate valve 4 are arranged on a second branch B, wherein the first manual gate valve 2 and the second manual gate valve 4 are normally open manual gate valves, and the flow passing through the hydraulic turbine is regulated by utilizing a branch pipeline regulating valve according to the demand of the wholesale flow, so that the normal operation of the hydraulic turbine is ensured under the premise that the wholesale flow meets the scheduling demand.
Example 2
The method for recovering the primary net residual pressure energy by utilizing the primary net residual pressure energy recovering system of the primary heat wholesale system in the embodiment 1 comprises the following steps:
When the hydroelectric generating set is used for generating electricity, the electric regulating valve on the branch where the non-hydroelectric generating set is positioned is slowly turned off, the electric regulating valve on the branch where the hydroelectric generating set is positioned is slowly opened, the hydraulic turbine and the generator shaft start to rotate, the electric regulating valve on the branch where the non-hydroelectric generating set is continuously turned off, when the rotating speed of the hydraulic turbine reaches 1000r/min (at the moment, the generating efficiency is low, the value needs to be a settable value, each hydraulic turbine is set and allowed to be different according to the parameters of the hydraulic turbine; meanwhile, the value can be changed from the aspect of economy), the generator is started, then the electric regulating valve on the branch where the hydroelectric generating set is positioned is continuously opened under the condition that the rated flow of the hydraulic turbine is not exceeded, and the generating power is gradually increased; if the wholesale flow is larger than the rated flow of the water turbine, after the rated flow of the water turbine is reached, adjusting an electric regulating valve on a branch where the non-water-turbine generator set is located, so that the rest flow passes through the branch; if the wholesale flow is smaller than the rated flow of the water turbine, closing an electric regulating valve on a branch where the non-hydroelectric generating set is located.
When the hydroelectric generating set stops generating, the electric regulating valve on the branch where the hydroelectric generating set is located is slowly closed, meanwhile, the electric regulating valve on the branch where the non-hydroelectric generating set is located is slowly opened, when the rotation speed of the water turbine is detected to be reduced to 1000r/min, the motor is closed, the power generation is stopped, and then the electric regulating valve on the branch where the hydroelectric generating set is located is completely closed.
When the water quantity in the starting operation process needs to be adjusted, the adjustment is carried out according to the following conditions:
(1) When the wholesale flow is greater than 1300m 3/h (the rated flow of the water wheel generator in the embodiment), the controller controls the second electric regulating valve 3 to be continuously opened, so that the flow passing through the water wheel reaches the scheduling wholesale requirement;
(2) When the wholesale flow is smaller than 1300m 3/h, the controller controls the second electric regulating valve 3 to be thoroughly closed, then the water inlet valve of the water turbine is gradually closed, the requirement of the system pressure is met, and the power generation efficiency of the water turbine is reduced at the moment;
It should be noted that, the generating set is equipped with the PLC switch board, and the protection effect of generating set can be realized to the switch board, and when system fault signal, automatic shutdown first electric control valve 1 promptly and open second electric control valve 3 gradually, guarantee that the flow production operation work of wholesale is not influenced.
The invention relates to the field of waste heat and residual pressure utilization, in particular to a primary network residual pressure energy recovery system and method of a large heating system, wherein the method comprises the steps of generating electricity by utilizing backwater residual pressure, wherein the available flow of a hydroelectric generating set and the available pressure difference are square relations, namely, under the condition that the pressure difference is rich, the available flow is [ (flow/selected rated flow) 2 ]. Times rated selected pressure difference; in the case of a rich flow, the available differential pressure is [ (differential pressure/rated differential pressure) 0.5 ] x rated flow. When the calculated power generation power is more than or equal to 20% of rated power generation power, the generator starts to work for generating electricity; when the calculated generated power is less than 20% of the rated generated power, the generator stops generating electricity.
The foregoing examples illustrate the invention in detail, but are merely preferred embodiments of the invention and are not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (9)
1. The system is characterized by comprising a primary heat wharf selling system, a residual pressure energy recovering system and a controller;
The primary heat wholesale system comprises a wholesale primary water supply pipeline and a wholesale primary water return pipeline which are connected with the main pipeline of the outlet of the relay pump station in parallel, wherein the wholesale primary water return pipeline is connected with at least two bypasses in parallel, and the bypass positioned at the outermost side is provided with a residual pressure energy recovery system; the residual pressure energy recovery system comprises a water turbine generator set;
And the bypass is provided with an electric regulating valve and a manual gate valve, and the controller is electrically connected with the electric regulating valve and can control the opening of the electric regulating valve.
2. The primary net residual pressure energy recovery system of the primary thermal wholesale system of claim 1 wherein: the wholesale heat meter is installed on the wholesale primary water return pipeline connected with the bypass, the wholesale heat meter is connected with the controller, and the wholesale heat meter is located at the upstream of the bypass.
3. The primary net residual pressure energy recovery system of the primary thermal wholesale system of claim 1 wherein: the normally closed manual gate valve is arranged on the primary water return pipeline connected with the bypass, so that water flow of the primary water return pipeline is passed through the bypass.
4. The primary net residual pressure energy recovery system of the primary thermal wholesale system of claim 1 wherein: and a bypass for installing the residual pressure energy recovery system is provided with a flowmeter, and the flowmeter is connected with a controller.
5. The primary net residual pressure energy recovery system of the primary thermal wholesale system of claim 1 wherein: the branch circuits are two, namely a first branch circuit and a second branch circuit, the residual pressure energy recovery system is arranged on the first branch circuit, and the connection port of the second branch circuit and the wharf selling primary water return pipeline is positioned at the inner side of the connection port of the first branch circuit and the wharf selling primary water return pipeline.
6. The primary net residual pressure energy recovery system of the primary thermal wholesale system of claim 1 wherein: and a bypass for installing the residual pressure energy recovery system is also provided with a temperature sensor and a vibration sensor, and the temperature sensor and the vibration sensor are both connected with the controller circuit.
7. The primary net residual pressure energy recovery system of the primary thermal wholesale system of claim 1 wherein: the system also comprises a rotating speed sensor, wherein the rotating speed sensor acquires the rotating speed of the water turbine and transmits the acquired rotating speed to the controller.
8. The primary net residual pressure energy recovery method of the primary net residual pressure energy recovery system based on the primary heat wharf selling system of any one of claims 1-7, characterized in that the method is:
When the hydroelectric generating set is used for generating electricity, the electric regulating valve on the branch where the non-hydroelectric generating set is located is slowly turned off, the electric regulating valve on the branch where the hydroelectric generating set is located is slowly turned on, the hydraulic turbine and the generator shaft start to rotate, the electric regulating valve on the branch where the non-hydroelectric generating set is located is continuously turned off, when the rotating speed of the hydraulic turbine is detected to reach a set value, the generator is turned on, then the electric regulating valve on the branch where the hydroelectric generating set is located is continuously turned on under the condition that the rated flow of the hydraulic turbine is not exceeded, and the generating power is gradually increased; if the wholesale flow is larger than the rated flow of the water turbine, after the rated flow of the water turbine is reached, adjusting an electric regulating valve on a branch where the non-water-turbine generator set is located, so that the rest flow passes through the branch; if the wholesale flow is smaller than the rated flow of the water turbine, closing an electric regulating valve on a branch where the non-hydroelectric generating set is located.
9. The primary network residual pressure energy recovery method of the primary thermal wholesale system of claim 8 wherein:
When the hydroelectric generating set stops generating, the electric regulating valve on the branch where the hydroelectric generating set is located is slowly closed, meanwhile, the electric regulating valve on the branch where the non-hydroelectric generating set is located is slowly opened, when the rotation speed of the water turbine is detected to be reduced to a set value, the motor is closed, the power generation is stopped, and then the electric regulating valve on the branch where the hydroelectric generating set is located is completely closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410420518.4A CN118089090A (en) | 2024-04-09 | 2024-04-09 | Primary network residual pressure energy recovery system and method of primary heat wharf selling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410420518.4A CN118089090A (en) | 2024-04-09 | 2024-04-09 | Primary network residual pressure energy recovery system and method of primary heat wharf selling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119093482A (en) * | 2024-11-05 | 2024-12-06 | 天津市热电有限公司 | A method and system for recycling residual pressure |
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- 2024-04-09 CN CN202410420518.4A patent/CN118089090A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119093482A (en) * | 2024-11-05 | 2024-12-06 | 天津市热电有限公司 | A method and system for recycling residual pressure |
| CN119093482B (en) * | 2024-11-05 | 2025-02-25 | 天津市热电有限公司 | A method and system for recycling residual pressure |
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