CN116104794A - Vapor compression heating equipment, control method thereof and heating system - Google Patents
Vapor compression heating equipment, control method thereof and heating system Download PDFInfo
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- CN116104794A CN116104794A CN202211434361.8A CN202211434361A CN116104794A CN 116104794 A CN116104794 A CN 116104794A CN 202211434361 A CN202211434361 A CN 202211434361A CN 116104794 A CN116104794 A CN 116104794A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/057—Bearings hydrostatic; hydrodynamic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a vapor compression heating device, a control method thereof and a heating system, wherein the vapor compression heating device comprises: a water vapor compressor; a first air supply flow path for delivering the gas discharged from the first vapor compressor to the first air inlet; a first pressure detection means for detecting the pressure P1 of the gas output from the exhaust port of the first vapor compressor; a second air supply flow path including an air tank connected to the first air inlet and a pump for supplying pressurized air to the air tank; a second pressure detecting part connected with the gas storage tank to detect the pressure P2 of the gas in the gas storage tank; a controller in signal connection with the first pressure detecting component, the second pressure detecting component and the pump respectively, and configured to: and when the pressure P1 is less than or equal to the required pressure Pa, adjusting the power of the pump according to the pressure P2 to adjust the pressure of the gas in the gas storage tank to the required pressure Pa, and closing the pump when the pressure P1 is more than the required pressure Pa so as to adopt the first gas supply flow path to supply gas for the first gas inlet.
Description
Technical Field
The invention relates to the technical field of vapor compression equipment, in particular to vapor compression heating equipment, a control method thereof and a heating system.
Background
The conventional single-cooling or heat pump compressor is used for cooling or heating in civil, commercial and industrial fields, the high-pressure gas in the circulation process is below 100 ℃, and a large amount of high-temperature steam is often required in the technical treatment process in petrochemical, pharmaceutical and food industries, such as: evaporating, purifying, concentrating and other technological processes. The traditional high-temperature steam source is prepared by a boiler, so that the consumption of non-renewable energy sources is high; in recent years, as a carbon neutralization plan is scheduled, environmental protection, energy conservation and emission reduction of enterprises are considered as the objects to be examined by the government, and the preparation mode of the enterprise high-temperature steam is forced to be changed.
The water as the refrigerant has the advantages of low carbon, environmental protection, economy, applicability, wide raw materials and the like, the water vapor compressor utilizes the heat pump technology to extract heat in an air source, and the high-temperature vapor discharged after compression can reach more than 120 ℃, so that the problems of energy consumption and environmental pollution are solved to a certain extent. The vapor compressors in the market are mainly concentrated on screw type, centrifugal type and Roots type vapor compressors, wherein the centrifugal type vapor compressors occupy the main market due to the characteristics of large flow, high bearable pressure ratio, wide operating range and the like. The oil lubrication bearing compressor is mature, but the problems of cooling, sealing, high bearing temperature and the like of the lubricating oil lead to great technical difficulties and often have the problem of indefinite reliability. The bearing adopting the static pressure gas suspension bearing as the water vapor compressor is currently in the industry, the bearing has small friction loss and high rotating speed, no additional oil supply equipment is needed, and the bearing gas supply source can directly come from the technological process.
Unlike conventional gas suspension compressors used in refrigeration systems, conventional compressors employing gas suspension bearings can take liquid from a condenser or gas from a gas-taking plus auxiliary system to supply gas to the bearings; the application scenes of the water vapor compressor are diversified, and the system equipment is not fixed. And currently, the most used air suspension bearing air supply is a double-stage compression conventional refrigerating system of a single compressor. The characteristics of the air bearing and the high pressure ratio of the steam compressor are that the static pressure air bearing steam compressor adopts a double-cantilever double-compressor four-stage compression process, so that the pressure in the motor cavity of each compressor is different, and in order to stably suspend the bearing of each compressor, the air supply pressure is provided for each compressor in a targeted way.
At present, a compressor adopting an air suspension bearing adopts air output by an air outlet of the compressor to supply air to the air suspension bearing in the compressor, but the pressure of the air discharged by the compressor in the starting and stopping stages of the compressor is insufficient to ensure the requirement of the air suspension bearing, so that the air suspension bearing is worn in the starting and stopping stages of the compressor.
Disclosure of Invention
The present invention is directed to a water vapor compression heating apparatus, a control method thereof, and a heating system, which are capable of improving the problem of insufficient pressure of gas supplied to a gas bearing during start and stop phases of a water vapor compressor in the related art.
According to an aspect of the embodiment of the present invention, there is provided a water vapor compression heating apparatus including:
the water vapor compressor comprises a first water vapor compressor, wherein the first water vapor compressor comprises a first rotating shaft, a first gas bearing for bearing the first rotating shaft and a first gas inlet for introducing gas into the first gas bearing;
a first air supply flow path for delivering the gas discharged from the first vapor compressor to the first air inlet;
a first pressure detection means provided in the first air supply flow path to detect the pressure P1 of the gas output from the exhaust port of the first vapor compressor;
a second air supply flow path including an air tank connected to the first air inlet and a pump for supplying pressurized air to the air tank;
a second pressure detecting part connected with the gas storage tank to detect the pressure P2 of the gas in the gas storage tank;
a controller in signal connection with the first pressure detecting component, the second pressure detecting component and the pump respectively, and configured to: and when the pressure P1 is less than or equal to the required pressure Pa, adjusting the power of the pump according to the pressure P2 to adjust the pressure of the gas in the gas storage tank to the required pressure Pa, and closing the pump when the pressure P1 is more than the required pressure Pa so as to adopt the first gas supply flow path to supply gas for the first gas inlet.
In some embodiments, the outlet end of the first air supply flow path is connected to an air reservoir for connection to the first air inlet through the air reservoir.
In some embodiments, the vapor compression heating apparatus further comprises a pressure regulating flow path connected to the pressure relief port of the air reservoir, the pressure regulating flow path being provided with a first pressure regulating valve and/or a switching valve.
In some embodiments, the controller is in signal connection with the first pressure regulating valve to adjust the opening of the first pressure regulating valve according to the pressure P2 detected by the second pressure detecting component, so as to adjust the pressure in the air storage tank to the required pressure Pa.
In some embodiments, the water vapor compression heating apparatus further comprises a third pressure detecting means for detecting a pressure P3 of the gas in the inner chamber of the first water vapor compressor, the controller being in signal connection with the third pressure detecting means and configured to calculate the required pressure Pa according to the following formula,
the demand pressure Pa is greater than or equal to the pressure P3+ and the preset pressure difference delta P,
the predetermined pressure difference Δp is a difference between the pressure of the gas introduced into the first inlet of the first water vapor compressor and the pressure P3.
In some embodiments, the vapor compression heating apparatus further comprises:
a third pressure detection means for detecting the gas pressure P3 in the inner chamber of the first water vapor compressor;
a fourth pressure detecting part detecting a pressure P4 of the gas to be inputted to the first gas inlet of the first water vapor compressor;
the second pressure regulating valve comprises an inlet connected with the air storage tank or the first air supply flow path and an outlet connected with the first air inlet of the first vapor compressor;
the controller is respectively in signal connection with the third pressure detection component, the fourth pressure detection component and the second pressure regulating valve so as to increase the opening of the second pressure regulating valve when P4-P3 is smaller than a preset pressure difference delta P or reduce the opening of the second pressure regulating valve when P4-P3 is larger than the preset pressure difference delta P.
In some embodiments, the water vapor compressor further comprises a second water vapor compressor comprising an air intake for introducing the gas to be compressed and an air exhaust for outputting the compressed gas, the air exhaust of the second water vapor compressor being in communication with the air intake of the first water vapor compressor, the second water vapor compressor further comprising a second rotary shaft, a second gas bearing carrying the second rotary shaft, and a second air intake for introducing the gas for the second gas bearing, the second air intake and the first air intake being respectively connected to the air reservoir or respectively in communication with the first air supply flow path.
In some embodiments, the vapor compression heating apparatus further comprises:
a fifth pressure detecting means for detecting the pressure P5 of the gas in the inner chamber of the second water vapor compressor;
a sixth pressure detecting part detecting a pressure P6 of the gas to be input to the second gas inlet of the second water vapor compressor;
the third pressure regulating valve comprises an inlet connected with the air storage tank or the first air supply flow path and an outlet connected with the second air inlet of the second vapor compressor;
the controller is respectively in signal connection with the fifth pressure detection component, the sixth pressure detection component and the third pressure regulating valve so as to increase the opening of the third pressure regulating valve when P6-P5 is smaller than the preset pressure difference delta P or reduce the opening of the third pressure regulating valve when P6-P5 is larger than the preset pressure difference delta P.
In some embodiments, the second supply flow path is connected to a suction end of the water vapor compressor to introduce gas to be compressed by the water vapor compressor.
In some embodiments, the vapor compression heating apparatus further comprises a gas source portion comprising a gas-liquid separation component, the gas outlet of the gas-liquid separation component being in communication with the inlet end of the second gas supply flow path.
In some embodiments, the gas source section further comprises a heating device that heats the gas-liquid separation component.
In some embodiments, the vapor compression heating apparatus further comprises:
a first check valve provided in the first air supply flow path; or (b)
And the second one-way valve is arranged in the second air supply flow path.
According to another aspect of the present invention, there is also provided a heating system including the above-described water vapor compression heating apparatus.
According to another aspect of the present invention, there is also provided a control method of the above-mentioned water vapor compression heating apparatus, in some embodiments, including:
acquiring the pressure P1 of compressed gas output by the first vapor compressor;
if the pressure P1 is less than or equal to the required pressure Pa, adjusting the power of the pump according to the pressure P2 to adjust the pressure of the gas in the gas storage tank to be the required pressure Pa; if the pressure P1 is greater than the demand pressure Pa, the pump is turned off to supply air to the first air inlet by adopting the first air supply flow path.
In some embodiments, after the pump is turned off to deliver gas through the gas reservoir to the first gas inlet using the first gas supply flow path,
acquiring pressure P2 of gas in gas storage tank
If the pressure P2 is more than the demand pressure Pa, reducing the opening of a first pressure regulating valve connected with a pressure relief opening of the gas storage tank; if P2 < the demand pressure Pa, the opening degree of the first pressure regulating valve is increased.
In some embodiments, when pressure P1 is less than or equal to demand pressure Pa and/or when pressure P1 is greater than demand pressure Pa:
acquiring the gas pressure P3 in the inner cavity of the first vapor compressor and the pressure P4 of the gas to be input into the first air inlet of the first vapor compressor;
if P4-P3 is less than the preset pressure difference delta P, increasing the opening of a second pressure regulating valve connected with the first air inlet to control the pressure of the air introduced by the first air inlet; if P4-P3 > the predetermined differential pressure DeltaP, the opening degree of the second pressure regulating valve is reduced.
In some embodiments, when pressure P1 is less than or equal to demand pressure Pa and/or when pressure P1 is greater than demand pressure Pa:
acquiring the pressure P5 of the gas in the inner cavity of the second water vapor compressor connected with the air suction port of the first water vapor compressor and the pressure P6 of the gas to be input to the second air inlet of the second water vapor compressor for introducing the gas for the gas bearing of the second water vapor compressor;
if P6-P5 is smaller than the preset pressure difference delta P, increasing the opening of a third pressure regulating valve connected with the second air inlet to control the pressure of the air introduced by the first air inlet; if P6-P5 > the predetermined differential pressure DeltaP, the opening of the third pressure regulating valve is reduced.
By the aid of the technical scheme, when the pressure of compressed water vapor discharged by the first water vapor compressor cannot reach the required pressure, the second air supply flow path can be used for supplying air to the gas bearing of the first water vapor compressor, and the problem that in the prior art, the pressure of air supplied to the gas bearing is insufficient due to the fact that the pressure of the compressed water vapor is low in the starting and stopping stages of the water vapor compressor is solved.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 shows a schematic configuration of a water vapor compression heating apparatus according to an embodiment of the present invention.
A water vapor compression heating apparatus of the present embodiment includes a water vapor compressor, a first air supply flow path 27, a first pressure detecting member 3, a second air supply flow path 28, a second pressure detecting member 7, and a controller.
The water vapor compressor comprises a first water vapor compressor 1, the first water vapor compressor 1 comprising a first rotary shaft, a first gas bearing carrying the first rotary shaft and a first gas inlet for introducing gas for the first gas bearing. The first air supply flow path 27 connects the air outlet and the first air inlet of the first water vapor compressor 1 to convey the discharged air of the first water vapor compressor 1 to the first air inlet. The first pressure detecting member 3 is provided in the first air supply flow path 27 to detect the pressure P1 of the gas output from the exhaust port of the first water vapor compressor 1.
The second air supply flow path 28 includes the air tank 6 connected to the first air inlet, and the pump 22 for supplying pressurized air to the air tank 6. The second pressure detecting member 7 is connected to the gas tank 6 to detect the pressure P2 of the gas in the gas tank 6.
The controller is in signal connection with the first pressure detecting part 3, the second pressure detecting part 7 and the pump 22, respectively, and is configured to: when the pressure P1 is less than or equal to the demand pressure Pa, the power of the pump 22 is regulated according to the pressure P2 to regulate the pressure of the gas in the gas storage tank 6 to the demand pressure Pa, and when the pressure P1 is more than the demand pressure Pa, the pump 22 is closed to supply gas to the first gas inlet by adopting the first gas supply flow path 27.
In this embodiment, when the pressure P2 of the compressed water vapor discharged from the first water vapor compressor 1 does not reach the required pressure Pa, the second air supply flow path 28 can be used to supply air to the gas bearing of the first water vapor compressor 1, so as to solve the problem of insufficient pressure of the air supplied to the gas bearing caused by lower pressure of the compressed water vapor in the start and stop stages of the water vapor compressor in the prior art.
Specifically, when the pressure P1 is equal to or less than the required pressure Pa (the second air supply flow path 28 is used for supplying air for the air bearing), the pressure P2 of the air in the air storage tank 6 is measured, and if the pressure P2 is less than the required pressure Pa, the power of the pump 22 is increased; if the pressure P2 > the demand pressure Pa, the power of the pump 22 is reduced.
In the present embodiment, the demand pressure Pa is a pressure range of Px to Ps, where Ps > Px. Therefore, the method of adjusting the pump 22 described above is: increasing the power of the pump 22 at a pressure P2 < a lower limit Px of the demand pressure Pa; when the pressure P2 > the upper limit value Ps of the demand pressure Pa, the power of the pump 22 is reduced; when Ps > P2 > Px, then the power of pump 22 is maintained.
The outlet end of the first air supply flow path 27 is connected to the air tank 6 to be connected to the first air inlet through the air tank 6.
In some embodiments, the first check valve 5 is further disposed in the first air supply flow path 27, so as to avoid the rapid pressure release of the air storage tank 6 after the first vapor compressor 1 stops working, which is beneficial to ensuring continuous air supply to the air bearing and ensuring stability of air supply.
In other embodiments, the second check valve 20 is disposed in the second air supply flow path 28 to prevent the air tank 6 from rapidly releasing pressure, which is beneficial to ensuring continuous air supply to the air bearing and ensuring stability of air supply.
In other embodiments, the water vapor compression heating apparatus further comprises a first filter 4 provided in the first air supply flow path 27 and/or a second filter 23 provided in the second air supply flow path 28.
The vapor compression heating apparatus further includes a pressure regulating flow path 29 connected to the pressure release port of the air tank 6, and the pressure regulating flow path 29 is provided with a first pressure regulating valve 19 and/or an on-off valve 18.
In the present embodiment, the pressure adjustment flow path 29 is used to adjust the pressure in the air tank 6 when the pressure P1 of the gas output from the exhaust port of the first water vapor compressor 1 is greater than the required pressure Pa and the first gas supply flow path 27 is used to supply the gas bearing.
The controller is connected to the first pressure regulating valve 19 in a signal manner so as to adjust the opening degree of the first pressure regulating valve 19 based on the pressure P2 detected by the second pressure detecting means 7, and to adjust the pressure in the air tank 6 to the required pressure Pa.
Specifically, the pressure P2 of the gas in the gas tank 6 is measured, and if the pressure P2 is smaller than the required pressure Pa, the opening degree of the first pressure regulating valve 19 is increased; if the pressure P2 > the demand pressure Pa, the opening degree of the first pressure regulating valve 19 is reduced.
Since the demand pressure Pa is a pressure range of Px to Ps and Ps > Px. Therefore, the above-mentioned method for adjusting the first pressure regulating valve 19 is as follows: increasing the opening of the first pressure regulating valve 19 at a pressure P2 < the lower limit Px of the demand pressure Pa; when the pressure P2 > the upper limit value Ps of the demand pressure Pa, the opening degree of the first pressure regulating valve 19 is reduced; when Ps > P2 > Px, the opening of the first pressure regulating valve 19 is kept unchanged.
In other embodiments, the pressure regulating flow path 29 is also used to regulate the pressure within the reservoir 6 when the pressure P1 is less than or equal to the demand pressure Pa and the second supply flow path 28 is used to supply gas to the gas bearing.
In some embodiments, the vapor compression heating apparatus further comprises a third pressure detecting means 2, the third pressure detecting means 2 being adapted to detect the pressure P3 of the gas in the inner chamber of the first water vapor compressor 1, the controller being in signal connection with the third pressure detecting means 2 and being configured to calculate the required pressure Pa according to the following formula,
the demand pressure Pa is greater than or equal to the pressure P3+ and the preset pressure difference delta P,
wherein the predetermined pressure difference Δp is a difference between the pressure of the first intake port-introduced gas of the first water vapor compressor 1 and the pressure P3.
Wherein the lower limit Px of the demand pressure Pa is equal to or greater than the pressure p3+ predetermined differential pressure Δp, and in some embodiments, the lower limit Px of the demand pressure pa=the pressure p3+ predetermined differential pressure Δp.
The water vapor compression heating apparatus further includes a third pressure detecting member 2, a fourth pressure detecting member 10, and a second pressure regulating valve 9.
The third pressure detecting means 2 detects the gas pressure P3 in the inner chamber of the first water vapor compressor 1; the fourth pressure detecting means 10 detects the pressure P4 of the gas to be input to the first gas inlet of the first water vapor compressor 1; the second pressure regulating valve 9 includes an inlet connected to the air tank 6 or the first air supply flow path 27 and an outlet connected to the first air inlet of the first vapor compressor 1.
The controller is in signal connection with the third pressure detecting means 2, the fourth pressure detecting means 10 and the second pressure regulating valve 9, respectively, to increase the opening of the second pressure regulating valve 9 when P4-P3 < the predetermined pressure difference Δp or to decrease the opening of the second pressure regulating valve 9 when P4-P3 > the predetermined pressure difference Δp.
In the present embodiment, the opening degree of the second pressure regulating valve 9 is controlled by the above-described method, regardless of whether the first air supply flow path 27 is used for air supply to the air bearing or the second air supply flow path 28 is used for air supply to the air bearing.
In this embodiment, the predetermined differential pressure ΔP is a pressure range of Pl to Ph, where Ph > Pl. Therefore, the above-described method of adjusting the second pressure regulating valve 9 is: increasing the opening of the second pressure regulating valve 9 at a pressure P4-P3 < a lower limit value Pl of the predetermined differential pressure Δp; decreasing the opening of the second pressure regulating valve 9 when the pressure P4-P3 > the upper limit value Ph of the predetermined differential pressure Δp; when Ph > P4-P3 > Pl, the opening of the second pressure regulating valve 9 is kept unchanged.
The water vapor compressor further comprises a second water vapor compressor 13, the second water vapor compressor 13 comprises an air suction port for introducing air to be compressed and an air discharge port for outputting compressed air, the air discharge port of the second water vapor compressor 13 is communicated with the air suction port of the first water vapor compressor 1, the second water vapor compressor 15 further comprises a second rotating shaft, a second air bearing for carrying the second rotating shaft and a second air inlet for introducing air for the second air bearing, and the second air inlet and the first air inlet are respectively connected with the air storage tank 6 or respectively communicated with the first air supply flow path 27.
The water vapor compression heating apparatus further includes a fifth pressure detecting member 14, a sixth pressure detecting member 16, and a third pressure regulating valve 15.
The fifth pressure detecting means 14 detects the pressure P5 of the gas in the inner chamber of the second water vapor compressor 13. The sixth pressure detecting part 16 detects the pressure P6 of the gas to be input to the second intake port of the second water vapor compressor 13. The third pressure regulating valve 15 includes an inlet connected to the air tank 6 or the first air supply flow path 27 and an outlet connected to the second air inlet of the second vapor compressor 13.
The controller is in signal connection with the fifth pressure detecting means 16, the sixth pressure detecting means 14 and the third pressure regulating valve 15, respectively, to increase the opening of the third pressure regulating valve 15 when P6-P5 < the predetermined pressure difference Δp or to decrease the opening of the third pressure regulating valve 15 when P6-P5 > the predetermined pressure difference Δp.
The method for adjusting the third pressure regulating valve 15 includes: increasing the opening of the third pressure regulating valve 15 at a pressure P6-P5 < a lower limit value Pl of the predetermined differential pressure Δp; decreasing the opening degree of the third pressure regulating valve 15 when the pressure P6-P5 > the upper limit value Ph of the predetermined differential pressure Δp; when Ph > P6-P5 > Pl, the opening of the third pressure regulating valve 15 is kept unchanged.
The two water vapor compressors are respectively communicated with the air storage tank 6 or the first air supply flow path 27, and the second pressure regulating valve 9 and the third pressure regulating valve 15 are respectively arranged, so that the air supply pressure of the two water vapor compressors is independently regulated, and each compressor can keep stable and proper air supply pressure.
The second supply flow path 28 is connected to the suction end of the water vapor compressor to introduce the gas to be compressed by the water vapor compressor.
The vapor compression heating apparatus further includes an air source portion 24, the air source portion 24 including a gas-liquid separation member 25, an air outlet of the gas-liquid separation member 25 being communicated with an inlet end of the second air supply flow path 28. The gas outlet of the gas-liquid separation part 25 is connected to the suction end of the water vapor compressor to deliver the gas to be compressed to the water vapor compressor.
The gas source portion 24 further includes a heating device 30 for heating the gas-liquid separation member 25 for causing the gas-liquid separation member 25 to generate more gas. The heating device 30 of the gas-liquid separation part 25 includes a heat pump apparatus.
The first water vapor compressor 1 further includes a first air outlet for outputting the first gas bearing air, and the first air outlet is connected to the gas-liquid separation member 25 through the first return line 11. The second vapor compressor 13 further includes a second gas outlet for outputting a second gas bearing gas, and the second gas outlet is connected to the gas-liquid separation member 25 through the second return line 17.
The water vapor compression heating apparatus further comprises a check valve 26 connected to the outlet of the water vapor compressor. The water vapor compression heating apparatus further comprises a third filter 8 connected to the outlet of the air tank 6.
According to another aspect of the present invention, there is also provided a heating system including the above-described water vapor compression heating apparatus.
According to another aspect of the present invention, there is also provided a control method of a water vapor compression heating apparatus, the control method including:
acquiring the pressure P1 of the compressed gas output by the first vapor compressor 1;
if the pressure P1 is less than or equal to the required pressure Pa, adopting a second air supply flow path 28 to supply air for the air bearing and adjusting the power of the pump 22 according to the pressure P2 so as to adjust the pressure of the air in the air storage tank 6 to be the required pressure Pa; if the pressure P1 > the demand pressure Pa, the pump 22 is turned off to supply the first intake port with the first supply flow path 27.
Specifically, at the lower limit value Px of the pressure P2 < the demand pressure Pa, the power of the pump 22 is increased; when the pressure P2 > the upper limit value Ps of the demand pressure Pa, the power of the pump 22 is reduced; when Ps > P2 > Px, then the power of pump 22 is maintained.
In some embodiments, after the pump 22 is turned off to deliver gas through the gas reservoir 6 to the first gas inlet using the first gas supply flow path 27,
acquiring the pressure P2 of the gas in the gas tank 6
If the pressure P2 is greater than the demand pressure Pa, the opening of the first pressure regulating valve 19 connected to the pressure relief port of the air tank 6 is reduced; if P2 < the demand pressure Pa, the opening degree of the first pressure regulating valve 19 is increased.
Specifically, at the lower limit value Px of the pressure P2 < the demand pressure Pa, the opening degree of the first pressure regulating valve 19 is increased; when the pressure P2 > the upper limit value Ps of the demand pressure Pa, the opening degree of the first pressure regulating valve 19 is reduced; when Ps > P2 > Px, the opening of the first pressure regulating valve 19 is kept unchanged.
In some embodiments, when pressure P1 is less than or equal to demand pressure Pa and/or when pressure P1 is greater than demand pressure Pa (i.e., whether the first supply flow path 27 is used to supply gas to the gas bearing or the second supply flow path 28 is used to supply gas to the gas bearing):
acquiring the gas pressure P3 in the inner cavity of the first water vapor compressor 1 and the pressure P4 of the gas to be input by the first air inlet of the first water vapor compressor 1;
if P4-P3 < the predetermined pressure difference DeltaP, increasing the opening of the second pressure regulating valve 9 connected with the first air inlet to control the pressure of the air introduced by the first air inlet; if P4-P3 > the predetermined differential pressure DeltaP, the opening degree of the second pressure regulating valve 9 is reduced.
Specifically, the method for adjusting the second pressure regulating valve 9 includes: increasing the opening of the second pressure regulating valve 9 at a pressure P4-P3 < a lower limit value Pl of the predetermined differential pressure Δp; decreasing the opening of the second pressure regulating valve 9 when the pressure P4-P3 > the upper limit value Ph of the predetermined differential pressure Δp; when Ph > P4-P3 > Pl, the opening of the second pressure regulating valve 9 is kept unchanged.
In some embodiments, when pressure P1 is less than or equal to demand pressure Pa and/or when pressure P1 is greater than demand pressure Pa:
acquiring the pressure P5 of the gas in the inner cavity of the second water vapor compressor 13 connected with the air suction port of the first water vapor compressor 1 and the pressure P6 of the gas to be input of the second air inlet of the second water vapor compressor 13 for introducing the gas for the gas bearing thereof;
if P6-P5 is smaller than the preset pressure difference delta P, the opening degree of the third pressure regulating valve 15 connected with the second air inlet to control the pressure of the air introduced by the first air inlet is increased; if P6-P5 > the predetermined differential pressure Δp, the opening degree of the third pressure regulating valve 15 is reduced.
Specifically, at the lower limit value Pl where the pressure P6-P5 < the predetermined differential pressure Δp, the opening degree of the third pressure regulating valve 15 is increased; decreasing the opening degree of the third pressure regulating valve 15 when the pressure P6-P5 > the upper limit value Ph of the predetermined differential pressure Δp; when Ph > P6-P5 > Pl, the opening of the third pressure regulating valve 15 is kept unchanged.
The working process of the vapor compression heating device of this embodiment is as follows:
1. before the water vapor compressor is started: the first pressure regulating valve 19 is closed, the on-off valve 18 is opened, and the opening degrees of the second pressure regulating valve 9 and the third pressure regulating valve 15 are adjusted to the maximum, and at this time, the pressure p3=the pressure p5, and the pressure p2=the pressure p6=the pressure P4. Then, the pump 22 is turned on so that the difference between the pressures P2 and P3 and the pressure P5 of the gas in the gas tank 6 is not smaller than the predetermined difference Δp to ensure that the gas of sufficient pressure can be supplied to the gas bearing of the water vapor compressor at the time of the start of the water vapor compressor.
2、
(1) When the pressure P1 is less than or equal to the required pressure Pa (the second air supply flow path 28 is adopted for supplying air for the air bearing), the pressure P2 of the air in the air storage tank 6 is measured, and if the pressure P2 is less than the required pressure Pa, the power of the pump 22 is increased; if the pressure P2 > the demand pressure Pa, the power of the pump 22 is reduced.
Specifically, the method for adjusting the pump 22 includes: increasing the power of the pump 22 at a pressure P2 < a lower limit Px of the demand pressure Pa; when the pressure P2 > the upper limit value Ps of the demand pressure Pa, the power of the pump 22 is reduced; when Ps > P2 > Px, then the power of pump 22 is maintained.
(2) When the pressure P1 > the required pressure Pa, the pump 22 is turned off and the on-off valve 18 is kept open, and at this time, the gas bearing is supplied with gas by the first gas supply flow path 27. Measuring the pressure P2 of the gas in the gas storage tank 6, and increasing the opening of the first pressure regulating valve 19 if the pressure P2 is smaller than the required pressure Pa; if the pressure P2 > the demand pressure Pa, the opening degree of the first pressure regulating valve 19 is reduced.
Specifically, the method for adjusting the first pressure regulating valve 19 includes: increasing the opening of the first pressure regulating valve 19 at a pressure P2 < the lower limit Px of the demand pressure Pa; when the pressure P2 > the upper limit value Ps of the demand pressure Pa, the opening degree of the first pressure regulating valve 19 is reduced; when Ps > P2 > Px, the opening of the first pressure regulating valve 19 is kept unchanged.
(3) The opening degrees of the second pressure regulating valve 9 and the third pressure regulating valve 15 are controlled respectively when the pressure P1 is equal to or less than the required pressure Pa and/or when the pressure P1 is greater than the required pressure Pa (i.e., whether the first air supply flow path 27 is used for air bearing air supply or the second air supply flow path 28 is used for air bearing air supply).
Control of the second pressure regulating valve 9: if P4-P3 < the predetermined pressure difference DeltaP, increasing the opening of the second pressure regulating valve 9 connected with the first air inlet to control the pressure of the air introduced by the first air inlet; if P4-P3 > the predetermined differential pressure DeltaP, the opening degree of the second pressure regulating valve 9 is reduced.
Specifically, the method for adjusting the second pressure regulating valve 9 includes: increasing the opening of the second pressure regulating valve 9 at a pressure P4-P3 < a lower limit value Pl of the predetermined differential pressure Δp; decreasing the opening of the second pressure regulating valve 9 when the pressure P4-P3 > the upper limit value Ph of the predetermined differential pressure Δp; when Ph > P4-P3 > Pl, the opening of the second pressure regulating valve 9 is kept unchanged.
Control of the third pressure regulating valve 15: acquiring the pressure P5 of the gas in the inner cavity of the second water vapor compressor 13 and the pressure P6 of the gas to be input of the second gas inlet of the second water vapor compressor 13 for introducing the gas for the gas bearing thereof;
if P6-P5 is smaller than the preset pressure difference delta P, the opening degree of the third pressure regulating valve 15 connected with the second air inlet to control the pressure of the air introduced by the first air inlet is increased; if P6-P5 > the predetermined differential pressure Δp, the opening degree of the third pressure regulating valve 15 is reduced.
Specifically, at the lower limit value Pl where the pressure P6-P5 < the predetermined differential pressure Δp, the opening degree of the third pressure regulating valve 15 is increased; decreasing the opening degree of the third pressure regulating valve 15 when the pressure P6-P5 > the upper limit value Ph of the predetermined differential pressure Δp; when Ph > P6-P5 > Pl, the opening of the third pressure regulating valve 15 is kept unchanged.
3. When the stop command is received, if the second air supply flow path 28 is supplied at this time, the pump 22 is turned off with a delay, the first pressure regulating valve 19 is kept closed, the on-off valve 18 is kept open, and the second pressure regulating valve 9 and the third control valve 15 are controlled in the same manner as in the above-described step 2.
When the first air supply flow path 27 is supplied with air at this time, the on-off valve 18 is closed, the pump 22 is opened, the first check valve 5 and the second check valve 20 function to maintain the pressure in the air tank 6, and the second pressure regulating valve 9 and the third control valve 15 are regulated to supply the air satisfying the pressure demand to the first water vapor compressor 1 and the second water vapor compressor 13.
The foregoing description of the exemplary embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (17)
1. A water vapor compression heating apparatus, comprising:
the water vapor compressor comprises a first water vapor compressor (1), wherein the first water vapor compressor (1) comprises a first rotating shaft, a first gas bearing for bearing the first rotating shaft and a first gas inlet for introducing gas into the first gas bearing;
a first air supply flow path (27) for delivering the gas discharged from the first vapor compressor (1) to the first air inlet;
a first pressure detection means (3) provided in the first air supply flow path (27) for detecting the pressure P1 of the gas output from the exhaust port of the first vapor compressor (1);
a second air supply flow path (28) including an air tank (6) connected to the first air inlet and a pump (22) for supplying pressurized air to the air tank (6);
a second pressure detection means (7) connected to the gas tank (6) to detect the pressure P2 of the gas in the gas tank (6);
a controller in signal connection with the first pressure detecting part (3), the second pressure detecting part (7) and the pump (22), respectively, and configured to: and when the pressure P1 is less than or equal to the demand pressure Pa, adjusting the power of the pump (22) according to the pressure P2 so as to adjust the pressure of the gas in the gas storage tank (6) to be the demand pressure Pa, and closing the pump (22) when the pressure P1 is more than the demand pressure Pa so as to adopt the first gas supply flow path (27) to supply gas for the first gas inlet.
2. A water vapour compression heating apparatus as claimed in claim 1, characterised in that the outlet end of the first air supply flow path (27) is connected to the air reservoir (6) for connection to the first air inlet via the air reservoir (6).
3. The water vapor compression heating device according to claim 1 or 2, further comprising a pressure regulating flow path (29) connected with the pressure relief port of the air storage tank (6), wherein the pressure regulating flow path (29) is provided with a first pressure regulating valve (19) and/or an on-off valve (18).
4. A water vapor compression heating apparatus as claimed in claim 3, characterized in that the controller is in signal connection with the first pressure regulating valve (19) to adjust the opening degree of the first pressure regulating valve (19) in accordance with the pressure P2 detected by the second pressure detecting means (7) to adjust the pressure in the air tank (6) to a demand pressure Pa.
5. The water vapor compression heating apparatus according to claim 1, further comprising a third pressure detecting means (2), said third pressure detecting means (2) for detecting a pressure P3 of a gas in an inner cavity of said first water vapor compressor (1), said controller being in signal connection with said third pressure detecting means (2) and configured to calculate said demand pressure Pa according to the following formula,
the demand pressure Pa is greater than or equal to the pressure P3+ and the preset pressure difference delta P,
wherein the predetermined pressure difference Δp is a difference between the set pressure of the first intake port introducing gas of the first water vapor compressor (1) and the pressure P3.
6. The water vapor compression heating apparatus as recited in claim 1, further comprising:
a third pressure detection means (2) for detecting the gas pressure P3 in the inner chamber of the first water vapor compressor (1);
a fourth pressure detecting part (10) that detects a pressure P4 of gas to be input to the first gas inlet of the first water vapor compressor (1);
a second pressure regulating valve (9) comprising an inlet connected to the air reservoir (6) or the first air supply flow path (27) and an outlet connected to the first air inlet of the first vapor compressor (1);
the controller is respectively in signal connection with the third pressure detection component (2), the fourth pressure detection component (10) and the second pressure regulating valve (9) so as to increase the opening degree of the second pressure regulating valve (9) when the P4-P3 is smaller than a preset pressure difference delta P or decrease the opening degree of the second pressure regulating valve (9) when the P4-P3 is larger than the preset pressure difference delta P.
7. The water vapor compression heating apparatus according to claim 1, characterized in that the water vapor compressor further comprises a second water vapor compressor (13), the second water vapor compressor (13) comprising an intake port for introducing a gas to be compressed and an exhaust port for outputting the compressed gas, the exhaust port of the second water vapor compressor (13) being in communication with the intake port of the first water vapor compressor (1), the second water vapor compressor (13) further comprising a second rotary shaft, a second gas bearing carrying the second rotary shaft, and a second intake port for introducing a gas for the second gas bearing, the second intake port and the first intake port being connected with the gas tank (6) or in communication with the first gas supply flow path (27), respectively.
8. The water vapor compression heating apparatus as recited in claim 7, further comprising:
a fifth pressure detecting means (14) for detecting the pressure P5 of the gas in the inner chamber of the second water vapor compressor (13);
a sixth pressure detecting part (16) that detects a pressure P6 of gas to be input to the second gas inlet of the second water vapor compressor (13);
a third pressure regulating valve (15) comprising an inlet connected to the air tank (6) or the first air supply flow path (27) and an outlet connected to the second air inlet of the second vapor compressor (13);
the controller is respectively in signal connection with the fifth pressure detection component (16), the sixth pressure detection component (14) and the third pressure regulating valve (15) so as to increase the opening degree of the third pressure regulating valve (15) when the P6-P5 is smaller than a preset pressure difference delta P or decrease the opening degree of the third pressure regulating valve (15) when the P6-P5 is larger than the preset pressure difference delta P.
9. A water vapour compression heating apparatus as claimed in claim 1, characterised in that the second supply flow path (28) is connected to the suction end of the water vapour compressor to introduce gas to be compressed by the water vapour compressor.
10. The water vapor compression heating apparatus as recited in claim 9, further comprising a gas source portion (24), said gas source portion (24) including a gas-liquid separation member (25), an air outlet of said gas-liquid separation member (25) communicating with an inlet end of said second gas supply flow path (28).
11. A water vapor compression heating apparatus as claimed in claim 9, characterized in that said gas source portion (24) further comprises heating means (30) for heating said gas-liquid separation member (25).
12. The water vapor compression heating apparatus as recited in claim 1, further comprising:
a first check valve (5) provided in the first air supply flow path (27); or (b)
And a second check valve (20) provided in the second air supply passage (28).
13. A heating system comprising the water vapor compression heating apparatus as claimed in any one of claims 1 to 12.
14. A control method of a water vapor compression heating apparatus as claimed in any one of claims 1 to 12, characterized by comprising:
acquiring the pressure P1 of the compressed gas output by the first vapor compressor (1);
if the pressure P1 is less than or equal to the required pressure Pa, adjusting the power of the pump (22) according to the pressure P2 so as to adjust the pressure of the gas in the gas storage tank (6) to be the required pressure Pa; if the pressure P1 > the demand pressure Pa, the pump (22) is turned off to supply the first intake port with the first supply flow path (27).
15. The control method according to claim 14, characterized in that after the pump (22) is turned off to deliver gas to the first gas inlet through the gas tank (6) using the first gas supply flow path (27),
acquiring the pressure P2 of the gas in the gas storage tank (6);
if the pressure P2 is larger than the demand pressure Pa, reducing the opening of a first pressure regulating valve (19) connected with a pressure relief port of the gas storage tank (6); if P2 < the demand pressure Pa, the opening degree of the first pressure regulating valve (19) is increased.
16. The control method according to claim 14, characterized in that when the pressure P1 is equal to or less than a demand pressure Pa and/or when the pressure P1 > the demand pressure Pa:
acquiring the gas pressure P3 in the inner cavity of the first water vapor compressor (1) and the pressure P4 of the gas to be input by the first gas inlet of the first water vapor compressor (1);
if the P4-P3 is smaller than the preset pressure difference delta P, increasing the opening degree of a second pressure regulating valve (9) connected with the first air inlet to control the pressure of the air introduced by the first air inlet; if P4-P3 > the predetermined differential pressure DeltaP, the opening degree of the second pressure regulating valve (9) is reduced.
17. The control method according to claim 14, characterized in that when the pressure P1 is equal to or less than a demand pressure Pa and/or when the pressure P1 > the demand pressure Pa:
acquiring the pressure P5 of the gas in the inner cavity of a second water vapor compressor (13) connected with the air suction port of the first water vapor compressor (1) and the pressure P6 of the gas to be input of a second air inlet of the second water vapor compressor (13) for introducing the gas for a gas bearing thereof;
if the P6-P5 is smaller than the preset pressure difference delta P, the opening degree of the third pressure regulating valve (15) connected with the second air inlet and used for controlling the pressure of the air introduced by the first air inlet is increased; if the pressure difference delta P is larger than the preset pressure difference delta P between the P6 and the P5, the opening degree of the third pressure regulating valve (15) is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211434361.8A CN116104794A (en) | 2022-11-16 | 2022-11-16 | Vapor compression heating equipment, control method thereof and heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211434361.8A CN116104794A (en) | 2022-11-16 | 2022-11-16 | Vapor compression heating equipment, control method thereof and heating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116104794A true CN116104794A (en) | 2023-05-12 |
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ID=86262097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211434361.8A Pending CN116104794A (en) | 2022-11-16 | 2022-11-16 | Vapor compression heating equipment, control method thereof and heating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116104794A (en) |
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2022
- 2022-11-16 CN CN202211434361.8A patent/CN116104794A/en active Pending
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