CN114922818A - Working condition control system applied to double-screw compressor - Google Patents

Abstract

The invention discloses a working condition control system applied to a double-screw compressor, which comprises a gas circuit module, an oil circuit module and a water replenishing module. The gas circuit module comprises a flash tank, a compressor and a gas storage tank, the flash tank, the compressor and the gas storage tank are sequentially communicated to form a passage, and the compressor is provided with a gas inlet and a gas outlet. The oil circuit module comprises an oil pump, and the oil pump is communicated with an oil inlet of the compressor to form a passage. The water replenishing module comprises a water replenishing pump and a water replenishing electromagnetic valve, and the water replenishing pump, the water replenishing electromagnetic valve and the air inlet of the compressor are communicated to form an access. The working condition control system applied to the double-screw compressor is particularly suitable for media with large adiabatic indexes, such as water vapor working media, process gases and the like. The working condition control system can actively control the working condition of the double-screw compressor by arranging the oil way module and the water supplementing module which can be actively controlled. Thereby ensuring the safety and stability of the working condition of the double-screw compressor. The working condition control system also has the advantages of simple structure, safety, reliability, wide application range and the like.

Description

A working condition control system applied to twin-screw compressor

technical field

The invention relates to the technical field of gas compression, in particular to a working condition control system applied to a twin-screw compressor.

Background technique

At present, water vapor compressors are usually twin-screw compressors, and twin-screw compressors are mainly divided into oil-injected compressors and oil-free compressors.

Among them, oil-injected compressors usually inject lubricating oil during the compression process, and the lubricating oil plays the role of lubrication, cooling, sealing and noise reduction during the compression process. Therefore, in order to ensure the quality of the water vapor compressor exhaust, it is necessary to add an oil and gas separation device to the compressor exhaust system to separate the injected lubricating oil, so that the water vapor compressor discharges compressed gas with extremely low oil content . Such oil-injected compressors generally cannot control the amount of fuel injected.

The oil-free compressor does not inject lubricating oil during the compression process. Therefore, additional lubrication, cooling, sealing and noise reduction systems need to be provided in oil-free compressors. For example, in order to control the temperature of a type of oil-free compressor, a water jacket is usually made on the casing of the rotor cavity of the compressor, and cooling water is introduced from the outside or the cooling liquid is separated from the rotor cavity to dissipate heat. . Such oil-free compressors are usually complicated in structure and large in volume. In addition, some oil-free compressors control the temperature of the compressor by reducing the volume ratio. Generally speaking, the volume ratio of such single-stage oil-free air compressors is only 1/3 of that of single-stage oil-injected air compressors. ~1/2.

Therefore, a new technology is urgently needed to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a working condition control system applied to a twin-screw compressor. The working condition control system applied to the twin-screw compressor is especially suitable for the medium with large adiabatic index such as water vapor working medium and process gas. The working condition control system applied to the twin-screw compressor actively controls the working condition of the twin-screw compressor by setting an oil circuit module and a water replenishing module that can be actively controlled. Thereby ensuring the safety and stability of the working conditions of the twin-screw compressor. In addition, the operating condition control system applied to the twin-screw compressor also has the advantages of simple and compact structure, good lubrication effect, and wide application range.

The present invention provides the following technical solutions: a working condition control system applied to a twin-screw compressor.

The working condition control system includes a gas circuit module, an oil circuit module and a water replenishment module. The gas circuit module includes a flash tank, a compressor and a steam storage tank. The flash tank, the compressor and the steam storage tank are connected in sequence to form a passage, and an oil inlet and an air inlet are arranged on the compressor. The oil circuit module includes an oil pump, and the oil pump and the oil inlet of the compressor are connected to form a passage. The water replenishment module includes a replenishment pump and a replenishment solenoid valve, and the replenishment pump, the replenishment solenoid valve and the air inlet of the compressor are connected to form a passage.

Preferably, the air path module further includes an intake filter, the intake filter is arranged between the flash tank and the compressor, and the flash tank, the intake filter and the compressor are communicated in sequence.

Preferably, the air path module further includes a muffler, the muffler is arranged between the compressor and the steam storage tank, and the compressor, the muffler and the steam storage tank are communicated in sequence.

Preferably, the air circuit module further includes an exhaust check valve, the exhaust check valve is arranged between the compressor and the steam storage tank, and the compressor, the exhaust check valve and the steam storage tank are communicated in sequence.

Preferably, the oil circuit module further includes a cooler, the cooler is arranged between the oil pump and the oil inlet of the compressor, and the oil pump, the cooler and the oil inlet of the compressor are communicated in sequence.

Preferably, the oil circuit module further includes a fan for cooling the cooler, and the fan is arranged near the cooler.

Preferably, the oil circuit module further includes an oil filter, the oil filter is arranged between the oil pump and the oil inlet of the compressor, and the oil pump, the oil filter and the oil inlet of the compressor are communicated in sequence.

Preferably, the water replenishment module includes an exhaust gas temperature detector for detecting the exhaust gas temperature of the compressor, and the exhaust gas temperature detector is arranged between the compressor and the steam storage tank near the compressor.

Preferably, an isolation gas inlet is provided on the compressor, a sealing member is provided in the compressor, and the sealing member includes an isolation gas accommodating cavity, and the isolation gas accommodating cavity is communicated with the isolation gas inlet.

Preferably, the compressor is provided with a balance air inlet, a seal is arranged in the compressor, the seal includes a balance gas accommodating cavity, the balance gas accommodating cavity is communicated with the balance gas inlet, and an exhaust port is provided on the compressor, and the balance gas inlet and The exhaust port is connected.

The working condition control system applied to the twin-screw compressor provided by the present invention actively controls the working condition of the twin-screw compressor by setting an oil circuit module and a water replenishing module that can be actively controlled, so that lubricating oil can be used for lubrication, so that the lubrication The effect is more stable and reliable, thereby ensuring the safety and stability of the working conditions of the twin-screw compressor. At the same time, the working condition control system applied to the twin-screw compressor does not need to configure a large number of working condition auxiliary systems, and the structure of the whole system is more compact.

Description of drawings

1 is a schematic structural diagram of a working condition control system applied to a twin-screw compressor according to an embodiment of the present invention; and

FIG. 2 is a schematic cross-sectional structural diagram of the compressor in the embodiment shown in FIG. 1 .

The reference numbers and names in the figure are as follows:

100, flash tank; 102, compressor; 104, steam storage tank; 106, oil inlet; 108, air inlet; 109, exhaust port; 110, intake filter; 112, muffler; 114, exhaust single Directional valve; 116, flow meter; 118, safety valve; 120, relief solenoid valve; 122: motor; 123, seal; 124, isolation gas chamber; 125, isolation gas inlet; 126, balance gas chamber; 127 , balance air inlet; 128, rotor cavity; 130, oil pump; 132, cooler; 134, fan; 136, oil filter; 138, fuel tank; 150, replenishment pump; 152, replenishment solenoid valve; 154, replenishment control valve; 160, isolation gas pipeline; 162, balance gas pipeline; 164, drain solenoid valve.

Detailed ways

Unless otherwise defined, technical or scientific terms used in the specification and claims shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be connected or detachable connected , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiments of the present application relate to a working condition control system applied to a twin-screw compressor as shown in FIG. 1 and FIG. 2 .

The working condition control system includes a gas circuit module, an oil circuit module and a water replenishment module. The gas circuit module includes a flash tank 100, a compressor 102 and a steam storage tank 104. The flash tank 100, the compressor 102 and the steam storage tank 104 are connected in sequence to form a passage. The compressor 102 is provided with an oil inlet 106 and an air inlet 108. The oil circuit module includes an oil pump 130, and the oil pump 130 communicates with the oil inlet 106 of the compressor 102 to form a passage. The water replenishment module includes a replenishment pump 150 and a replenishment solenoid valve 152 . The replenishment pump 150 , the replenishment solenoid valve 152 and the air inlet 108 of the compressor 102 communicate with each other to form a passage.

In some embodiments, the air circuit module further includes an intake air filter 110, the intake air filter 110 is disposed between the flash tank 100 and the compressor 102, and the flash tank 100, the intake air filter 110 and the compressor 102 are in sequence Connected.

In some embodiments, the air circuit module further includes a muffler 112, the muffler 112 is disposed between the compressor 102 and the steam storage tank 104, and the compressor 102, the muffler 112 and the steam storage tank 104 are communicated in sequence.

In some embodiments, the air circuit module further includes an exhaust one-way valve 114 , the exhaust one-way valve 114 is disposed between the compressor 102 and the steam storage tank 104 , the compressor 102 , the exhaust one-way valve 114 and the steam storage tank 104 Connect sequentially.

In some embodiments, the gas circuit module further includes a flow meter 116 , the flow meter 116 is disposed between the exhaust check valve 114 and the steam storage tank 104 , and the exhaust check valve 114 , the flow meter 116 and the steam storage tank 104 are connected in sequence.

In some embodiments, the air circuit module further includes a safety valve 118 , the compressor 102 is provided with an air inlet 108 and an exhaust port 109 , the inlet of the safety valve 118 communicates with the exhaust port 109 of the compressor 102 , and the safety valve 118 The outlet of the compressor 102 communicates with the inlet port 108 of the compressor 102 .

In some embodiments, the air circuit module further includes a relief solenoid valve 120 , the compressor 102 is provided with an inlet port 108 and an outlet port 109 , and the inlet of the relief solenoid valve 120 is communicated with the outlet port 109 of the compressor 102 . , the outlet of the discharge solenoid valve 120 is communicated with the air inlet 108 of the compressor 102 .

In the embodiment shown in FIG. 1 and FIG. 2 , the gas circuit module includes a flash tank 100 , an intake filter 110 , a compressor 102 , a muffler 112 , an exhaust check valve 114 and a steam storage tank 104 , which are communicated in sequence. . When the compressor 102 is driven and started by the motor 122, the evaporated water vapor is sucked out from the flash tank 100, and then purified by the intake filter 110 and then flows into the compressor 102 for compression, thereby forming high temperature and high pressure water vapor. The high-temperature and high-pressure water vapor flows out of the compressor 102 and then enters the muffler 112 . When the pressure of the high temperature and high pressure water vapor is higher than the pressure in the steam storage tank 104 , the exhaust check valve 114 is opened, and the high temperature and high pressure water vapor flows into the steam storage tank 104 .

In some embodiments, the oil circuit module further includes a cooler 132, the cooler 132 is disposed between the oil pump 130 and the oil inlet 106 of the compressor 102, and the oil pump 130, the cooler 132 and the oil inlet 106 of the compressor 102 are in sequence Connected.

In some embodiments, the oil circuit module further includes a fan 134 for cooling the cooler 132 , and the fan 134 is disposed near the cooler 132 .

In some embodiments, the oil circuit module further includes an oil filter 136 disposed between the oil pump 130 and the oil inlet 106 of the compressor 102 , the oil pump 130 , the oil filter 136 and the oil inlet of the compressor 102 The ports 106 communicate in turn.

In the embodiment shown in FIG. 1 and FIG. 2 , the oil circuit module includes an oil pump 130 , a cooler 132 and an oil filter 136 connected in sequence, and the oil circuit module further includes a fan 134 disposed near the cooler 132 . The oil pump 130 can draw lubricating oil from the oil tank 138 , the lubricating oil flows through the cooler 132 and is cooled, then flows through the oil filter 136 to be filtered, and flows into the compressor 102 through the oil inlet 106 of the compressor 102 . Lubricating oil may be used to lubricate and cool components such as bearings and gears in compressor 102 . If further cooling of the lubricating oil is required, the fan 134 can be turned on to send air to the cooler 132 to further cool the lubricating oil.

In some embodiments, the water replenishment module includes a discharge temperature detector for detecting the discharge temperature of the compressor 102 , and the discharge temperature detector is disposed between the compressor 102 and the steam storage tank 104 near the compressor 102 .

In some embodiments, the water replenishment module further includes a water replenishment regulating valve 154, which is disposed between the water replenishing solenoid valve 152 and the air inlet 108 of the compressor 102, and the replenishing water pump 150, the water replenishing solenoid valve 152, the water replenishing regulating valve 154 and The air inlet 108 of the compressor 102 communicates with each other to form a passage.

In the embodiment shown in FIG. 1 and FIG. 2 , the water supplement module includes a supplement water pump 150 , a water supplement solenoid valve 152 and an exhaust temperature detector. When the compressor 102 is operating, the makeup pump 150 is turned on. The exhaust gas temperature detector detects the exhaust gas temperature of the compressor 102 . When the exhaust gas temperature is higher than or equal to the set value, the water supplement solenoid valve 152 is opened, and liquid water is introduced to cool the compressor 102 . When the exhaust gas temperature is lower than the set value, the water replenishment solenoid valve 152 is closed.

In some embodiments, the compressor 102 is provided with an isolation gas inlet 125 , the compressor 102 is provided with a seal 123 , the seal 123 includes an isolation gas accommodating cavity 124 , and the isolation gas accommodating cavity 124 communicates with the isolation gas inlet 125 . The isolation gas inlet 125 may be connected to the isolation gas pipeline 160 to introduce external isolation gas. Through the isolation gas inlet 125, isolation gas can be introduced into the isolation gas accommodating cavity 124 of the sealing member 123, so as to improve the sealing effect of the sealing member 123 of the compressor 102. The barrier gas may be dry air.

In some embodiments, the compressor 102 is provided with a balance gas inlet 127, and the compressor 102 is provided with a seal 123. The seal 123 includes a balance gas chamber 126, and the balance gas chamber 126 communicates with the balance gas inlet 127. The compressor 102 is provided with an exhaust port 109 , and the balance gas inlet 127 is communicated with the exhaust port 109 . The balance air chamber 126 may be disposed at a position of the seal 123 close to the rotor chamber 128 . The balance gas inlet 127 and the exhaust port 109 may be connected by a balance gas pipe 162 . Atmospheric pressure may leak into the rotor cavity 128 of the compressor 102 when the suction or discharge side pressure of the compressor 102 is below atmospheric pressure. In the embodiment shown in FIG. 1 and FIG. 2 , in order to avoid the occurrence of atmospheric leakage, the position of the sealing member 123 close to the rotor cavity 128 may be filled with balancing gas. The balance gas is high-temperature and high-pressure steam produced by the compressor 102 . Therefore, the pressure of the balance gas is higher than the atmospheric pressure, which can effectively prevent the atmosphere from leaking into the rotor cavity 128 .

In some embodiments, the operating condition control system includes a drain solenoid valve 164, and the discharge port 109 of the compressor 102 communicates with the drain solenoid valve 164. The drain solenoid valve 164 may be used to exhaust the air in the condition control system, especially, the air in the condition control system during the initial start-up phase of the compressor 102 operation.

Here, an example of the application of a working condition control system applied to a twin-screw compressor in water vapor compression is given. In this embodiment, the same parts as those in the above-mentioned embodiment as shown in FIG. 1 and FIG. 2 will not be repeated.

In this embodiment, the working condition control system includes a gas circuit module, an oil circuit module and a water replenishing module. The gas circuit module includes a flash tank, an intake filter, a compressor, a muffler, an exhaust check valve and a steam storage tank which are communicated in sequence. When the compressor is driven and started by the motor, the evaporated water vapor is sucked out of the flash tank. The temperature of the water in the flash tank can be 85°C, the temperature of the evaporated water vapor from the flash can be 80°C, and the corresponding saturated steam pressure can be 0.047MPa (A). Subsequently, the evaporated water vapor is purified by the intake filter and then flows into the compressor. At this time, the entire pipeline is under negative pressure conditions. The compressor compresses the evaporated water vapor and forms high temperature and high pressure water vapor. The pressure value of the high-temperature and high-pressure water vapor may be 0.198 MPa(A), and the temperature may be 120°C. High temperature and high pressure water vapor flows out of the compressor and enters the muffler. When the pressure of the high temperature and high pressure water vapor is higher than the pressure in the steam storage tank, the exhaust check valve is opened, and the high temperature and high pressure water vapor flows into the steam storage tank. System piping can be sealed by using flanges and gaskets.

The compressor may include a compression chamber in the middle and bearing chambers at both ends, and the compressor may further include seals between the compression chambers and the bearing chambers, respectively. The seal may be a dynamic seal assembly. The sealing member may be provided with a balance air accommodating cavity disposed near the compression cavity and an isolation air accommodating cavity disposed close to the bearing cavity.

The isolation gas chamber can be filled with dry air as isolation gas. The amount of dry air is generally not more than 10Nm ³ /h, and the pressure of the dry air is slightly higher than the exhaust pressure of the compressor, which can be 0.22MPa(A). By arranging the isolation gas accommodating cavity, the compression cavity and the bearing cavity of the compressor can be isolated.

The balance air accommodating chamber can be filled with balancing gas which prevents the air in the isolation air accommodating chamber from leaking into the compression chamber of the compressor. The balance gas can be high temperature and high pressure steam produced by the compressor, and the pressure value can be 0.198MPa(A). The balance gas can be used to isolate the compression chamber of the compressor from the dry air to ensure the purity of the steam.

Here again, an example of the application of a working condition control system applied to a twin-screw compressor in coalbed methane compression is given. In this embodiment, the same parts as those in the above-mentioned embodiments will not be repeated.

The main component of CBM is CH ₄ . The general inlet temperature of the compressor is -10℃～45℃ at room temperature, and the inlet pressure is a slight positive pressure of 0.12MPa (A). The general discharge pressure of the compressor is 0.9MPa(A), and the discharge temperature is 80°C. The compressor may include a compression chamber in the middle and bearing chambers at both ends, and the compressor may further include seals between the compression chambers and the bearing chambers, respectively. The seal may be a dynamic seal assembly. The sealing member may only be provided with an isolation gas accommodating cavity disposed close to the bearing cavity. The isolation air chamber can be filled with dry air as isolation gas. The amount of dry air is generally not more than 15Nm ³ /h, and the pressure of the dry air is higher than the exhaust pressure of the compressor, which can be 1MPa(A). By arranging the isolation gas accommodating cavity, the compression cavity and the bearing cavity of the compressor can be isolated.

In addition, in this embodiment, a certain amount of water needs to be injected into the compressor through the water replenishment module during the compression process, and the amount of water can account for about 1% to 1.5% of the exhaust volume of the compressor. The water cools the compression process and also eliminates sparks from dry friction that can occur with rotating parts in the compressor.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (10)

1. A working condition control system applied to a twin-screw compressor, the working condition control system comprises a gas circuit module, an oil circuit module and a water replenishing module; wherein, the gas circuit module comprises a flash tank, a compressor and a storage tank; a steam tank, the flash tank, the compressor and the steam storage tank are connected in sequence to form a passage, the compressor is provided with an oil inlet and an air inlet; the oil circuit module includes an oil pump, the oil pump and the compressor The oil inlet of the compressor is connected to form a passage; the water replenishment module includes a replenishment pump and a replenishment solenoid valve, and the replenishment pump, the replenishment solenoid valve and the air inlet of the compressor are connected to form a passage. 2 . The operating condition control system applied to a twin-screw compressor according to claim 1 , wherein the gas path module further comprises an intake filter, and the intake filter is arranged in the flash tank. 3 . and the compressor, the flash tank, the intake air filter and the compressor are communicated in sequence. 3 . The operating condition control system applied to a twin-screw compressor according to claim 1 , wherein the gas path module further comprises a muffler, and the muffler is arranged on the compressor and the steam storage tank. 4 . In between, the compressor, the muffler and the steam storage tank are communicated in sequence. 4 . The working condition control system applied to a twin-screw compressor according to claim 1 , wherein the air path module further comprises an exhaust check valve, and the exhaust check valve is arranged on the compressor. 5 . Between the compressor and the steam storage tank, the compressor, the exhaust check valve and the steam storage tank are communicated in sequence. 5 . The operating condition control system applied to a twin-screw compressor according to claim 1 , wherein the oil circuit module further comprises a cooler, and the cooler is arranged between the oil pump and the compressor. 6 . Between the oil inlets, the oil pump, the cooler and the oil inlets of the compressor are communicated in sequence. 6 . The operating condition control system applied to a twin-screw compressor according to claim 5 , wherein the oil circuit module further comprises a fan for cooling the cooler, and the fan is arranged close to the at the cooler. 7 . The operating condition control system applied to a twin-screw compressor according to claim 1 , wherein the oil circuit module further comprises an oil filter, and the oil filter is arranged between the oil pump and the compressor. 8 . Between the oil inlets of the compressor, the oil pump, the oil filter and the oil inlet of the compressor are communicated in sequence. 8 . The operating condition control system applied to a twin-screw compressor according to claim 1 , wherein the water replenishing module comprises an exhaust gas temperature detector for detecting the exhaust gas temperature of the compressor, and the exhaust gas temperature A detector is arranged between the compressor and the steam storage tank near the compressor. 9 . The operating condition control system applied to a twin-screw compressor according to claim 1 , wherein the compressor is provided with an isolation gas inlet, and a sealing member is provided in the compressor, and the sealing member comprises: 10 . an isolation gas accommodating cavity, the isolation gas accommodating cavity communicates with the isolation gas inlet. 10 . The operating condition control system applied to a twin-screw compressor according to claim 1 , wherein a balance gas inlet is provided on the compressor, a sealing member is provided in the compressor, and the sealing member comprises 10 . A balancing gas accommodating cavity, the balancing gas accommodating cavity is communicated with the balancing gas inlet, the compressor is provided with an exhaust port, and the balancing gas inlet is communicated with the exhaust port.

Images