WO2024066841A1

WO2024066841A1 - Sealed tail-vapor recovery vapor power system

Info

Publication number: WO2024066841A1
Application number: PCT/CN2023/114859
Authority: WO
Inventors: 李文辉
Original assignee: 李文辉
Priority date: 2022-09-30
Filing date: 2023-08-25
Publication date: 2024-04-04
Also published as: CN115899568A

Abstract

A sealed tail-vapor recovery vapor power system, comprising a vaporization apparatus (1), a vapor acting apparatus (2), a tail vapor recovery apparatus (3), a pressurization apparatus (4), a liquefaction apparatus (5) and a liquid recovery apparatus (6). By pressurizing tail vapor to increase the boiling point and implementing sealed recovery of the tail vapor, the present system implements closed circulation of a liquid medium and the operation of a vapor power system in a sealed environment; by means of selecting a liquid which has a relatively low boiling point under normal atmospheric pressure as a medium for liquid-vapor conversion, and installing an air heat exchanger in the vaporization apparatus, a vapor power system suitable for a low-temperature environment can be manufactured, thus achieving the conversion of heat energy in air energy into kinetic energy.

Description

Sealed exhaust steam recovery pneumatic system

Technical Field

The invention relates to the technical field of steam power systems, and in particular to a sealed tail steam recovery steam power system.

Background technique

The traditional principle for driving a gas working device is that the liquid medium vaporizes in a certain container, causing the pressure inside the container to increase, resulting in a pressure difference with the outside world. The gas flows from the inside of the high-pressure container to the low-pressure area outside, driving the gas working device to move, thereby realizing the conversion of thermal energy into mechanical energy.

Since the tail steam after passing through the steam working device, the tail steam refers to the steam output from the tail output end of the steam working device, although its pressure and temperature are reduced, it is still in a vaporized state. For these tail steam, current technology generally discards it and discharges it directly into the atmosphere, or continues to cool it through other media, such as heat exchange, and recycles it after liquefaction. However, these methods have not gotten rid of the dependence on the working environment. Generally, only water can be selected as its liquid medium, and the overall working environment is also maintained at atmospheric pressure. Therefore, the working temperature of the steam engine driven by the traditional steam working device generally needs to be higher than the boiling point of water at atmospheric pressure by 100°C, and it cannot achieve normal operation in a low temperature environment, and it cannot effectively convert the thermal energy in the air into kinetic energy.

Summary of the invention

The purpose of the present invention is to provide a sealed tail steam recovery pneumatic system, which can efficiently recycle tail steam and is suitable for low-temperature working environments.

The above technical objectives of the present invention are achieved through the following technical solutions: a sealed tail steam recovery pneumatic system, including a vaporization device, a steam working device, a tail steam recovery device, a pressurizing device, a liquefaction device, and a liquid recovery device. The vaporization device can change the medium in the liquid form inside it into a vapor state, and its steam outlet end and liquid inlet end are respectively connected with the steam inlet end of the steam working device and the liquid outlet end of the liquid recovery device through a sealed connection. The steam working device is connected to the tail steam recovery device and/or is located inside the tail steam recovery device. One end of the tail steam recovery device is connected to the pressurizing device, and/or the pressurizing device is located inside the tail steam recovery device. The pressurizing device is driven to pressurize the steam transported by the tail steam recovery device. It is connected to the liquefaction device. The liquefaction device can change the steam pressurized by the pressurizing device from a vapor state to a liquid state. It is connected to the liquid recovery device. The liquefaction recovery device can re-transport the liquid liquefied by the liquefaction device to the vaporization device.

As an example, a liquid medium for vaporization circulation is also included in the vaporization device.

As an example, the steam outlet end of the tail steam recovery device is connected to the steam inlet end of the pressurizing device, and the output end of the pressurizing device is connected to the steam inlet end of the liquefaction device.

As an example, the pressurizing device includes a sealed cylinder body and a piston slidably arranged inside it, one end of the sealed cylinder body is provided with a steam inlet check valve 1 and a steam outlet check valve 1 in sequence, and the other end of the sealed cylinder body is provided with a steam inlet check valve 2 and a steam outlet check valve 2 in sequence.

As an example, the exhaust gas recovery device is connected to the steam inlet check valve 1 and the steam inlet check valve 2 respectively through branch pipe 1, and the liquefaction device is connected to the steam outlet check valve 1 and the steam outlet check valve 2 respectively through branch pipe 2.

As an example, the piston 1 is connected to a power device 1.

As an example, a steam injection control valve is provided on one end of the vaporization device where steam is discharged, and a liquid control valve is provided at the connection point between the liquid recovery device and the liquefaction device.

As an example, the vaporization device includes an air heat exchanger and a pressure vessel, and the air heat exchanger is connected to the pressure vessel.

As an example, a self-pressurizing device is also included. The self-pressurizing device is driven by the high-pressure steam in the vaporizing device and can pressurize the steam delivered from the tail steam recovery device. The self-pressurizing device is connected to the liquefaction device.

As an example, the liquid medium is a liquid having a relatively low boiling point under normal atmospheric pressure.

Beneficial effects of the present invention: Compared with the prior art, the present invention utilizes the principle that the boiling point of a general liquid increases with the increase of pressure, and pressurizes the tail steam through the tail steam recovery device to increase the boiling point, so that the tail steam is sealed and recovered to avoid leakage of the discharged tail steam, thereby realizing the closed circulation of the liquid medium and getting rid of the dependence on the external environment, so that it can work in a sealed environment. Since the tail steam is no longer dependent on the external environment temperature to re-liquefy, the present invention selects a liquid with a lower boiling point under conventional atmospheric pressure as the medium for liquid-to-gas conversion, and installs an air heat exchanger in the vaporization device, so that a pneumatic system suitable for low-temperature environments can be manufactured. system, to achieve the purpose of converting the thermal energy in the air into kinetic energy.

The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram for illustrating the connection between various devices in one embodiment of the present invention;

FIG. 2 is an enlarged view of portion A in FIG. 1 .

Figure numerals: 1, vaporization device; 101, pressure vessel; 102, air heat exchanger; 103, electric water pump; 2, steam working device; 3, tail steam recovery device; 4, pressurizing device; 401, steam inlet check valve 1; 402, steam inlet check valve 2; 403, power device 1; 404, steam outlet check valve 1; 405, piston 1; 406, steam outlet check valve 2; 407, sealed cylinder 1; 5, liquefaction device; 501, liquid control valve; 6, liquid recovery device; 601, steam inlet check valve 3; 602, power device 2; 603, liquid flow One-way valve for steam outlet; 604, two-piston; 605, four-way valve for steam inlet; 606, two-way valve for liquid outflow; 607, two-sealed cylinder body; 7, liquid medium; 8, steam injection control valve; 9, self-pressurizing device; 901, six-way valve; 902, five-way valve for steam inlet; 903, six-way valve for steam inlet; 904, three-way valve for steam outlet; 905, three-piston; 906, four-way valve for steam outlet; 907, three-sealed cylinder body; 908, four-sealed cylinder body; 909, four-piston; 10, connecting rod; 11, power output device; 12, one-branch pipe; 13, two-branch pipe.

Detailed ways

The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this Embodiments: All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. At the same time, it should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

It should be noted that, in this article, "gas" refers to a gaseous substance that is formed by heating a liquid, "vaporization" refers to changing a liquid substance into a gaseous substance, and "liquefaction" refers to changing a gaseous substance into a liquid substance. In this article, the directional words mentioned in this embodiment, such as "up, down, left, right", etc., are only used in conjunction with the various drawings to enable technicians in this technical field to understand the relationship between various features or parts.

As shown in FIG1 , a sealed exhaust steam recovery steam-powered system includes a vaporizer 1. In this embodiment, the vaporizer 1 is composed of a pressure vessel 101 and an air heat exchanger 102, wherein an electric water pump 103 is fixed on a pipeline from the air heat exchanger 102 to the pressure vessel 101. The pressure vessel 101 is a sealed container made of a high-pressure resistant material, and is connected with a steam outlet and a liquid inlet. The steam outlet on the right side is connected to the air inlet of a steam working device 2 and to a six-way valve 901 through a steam flow pipe (not shown in the drawing), and a steam injection control valve 8 is fixed at the connection between the steam flow pipe and the steam working device 2. In this example, the steam injection control valve 8 can adjust the frequency and size of the opening and closing of the aperture in the control valve, control the size of the steam flow through the interior thereof, and achieve the purpose of adjusting the output power of the system.

The liquid inlet end above the pressure vessel 101 is connected to the liquid outlet end of the liquid recovery device 6. The air heat exchanger 102 in the vaporization device 1 adopts an air conditioning condenser structure and is connected to the pressure vessel. 101 are connected through a metal flow pipe, and an electric water pump 103 is installed between the air heat exchanger 102 and the pressure container 101, so that the liquid medium 7 can flow between the two.

It includes a steam working device 2 and a tail steam recovery device 3. The steam working device 2 adopts a steam turbine structure, and a power output device 11 is provided at its output end. Its purpose is to use the steam working device 2 as a driving method. In this embodiment, the tail steam recovery device 3 adopts a closed container to seal the steam working device 2 as a whole inside it.

The pressurizing device 4 is included. In this embodiment, the pressurizing device 4 is composed of a sealed cylinder body 407 and a piston 405 slidably arranged inside the sealed cylinder body 407. A steam inlet check valve 401 and a steam outlet check valve 404 are welded and fixed to the upper end of the outer portion of the sealed cylinder body 407 from right to left in sequence. A steam inlet check valve 402 and a steam outlet check valve 406 are welded and fixed to the lower end of the outer portion in sequence. The steam inlet check valve 401 and the steam inlet check valve 402 are connected to the interior of the tail steam recovery device 3 through a branch pipe 12, and the steam outlet check valve 404 and the steam outlet check valve 406 are connected to the interior of the liquefaction device 5 through a branch pipe 13. The pressurizing device 4 also includes a power device 403. In this example, the power device 403 adopts an electric motor, and its output end is inserted into the sealed cylinder body 407 and connected to the piston 405. Its purpose is that the pressurizing device 4 drives the piston 405 connected to it to reciprocate through the power device 403, so as to pressurize the gas delivered from the tail steam recovery device 3, and deliver the pressurized gas to the inside of the liquefaction device 5 through the steam outlet check valve 404 and the steam outlet check valve 2 406 through the branch pipe 2 13.

In this embodiment, the liquefaction device 5 is a sealed container made of a high pressure resistant material. The liquid recovery device 6 is located below the liquefaction device 5. The outer wall of the liquefaction recovery device 6 is fixed with a liquid The control valve 501, the other end of the liquid control valve 501 is connected to the liquefaction device 5. The liquid recovery device 6 also includes a power device 2 602 and a sealed cylinder 2 607, and a piston 2 604 arranged to slide horizontally along the length direction inside the sealed cylinder 2 607. The power device 2 602 is arranged outside the sealed cylinder 2 607, and its output end extends into the sealed cylinder 2 607 and is connected to the piston 2 604. The upper side of the outer wall of the sealed cylinder 2 607 is welded and fixed with a steam inlet check valve 3 601 and a steam inlet check valve 4 605 from left to right, and the lower side of the outer wall is welded and fixed with a liquid outflow check valve 1 603 and a liquid outflow check valve 2 606 from left to right. When the power device 2 602 drives the piston 2 604 to move, the liquid collected in the liquid recovery device 6 can be re-delivered to the pressure vessel 101 in the vaporization device 1 through the liquid outflow check valve 1 603 and the liquid outflow check valve 2 606.

It includes a self-pressurizing device 9. In this embodiment, the self-pressurizing device 9 is composed of a six-way valve 901, a sealed cylinder body 907 and a piston 905 slidably arranged inside it, a sealed cylinder body 908 and a piston 909 slidably arranged inside it. A connecting rod 10 is arranged on the piston 905 and is connected to the piston 909. The upper end of the outer wall of the sealed cylinder body 907 is welded and fixed with a steam outlet check valve 904 and a steam inlet check valve 902 from left to right, and the lower end of the outer wall is welded and fixed with a steam outlet check valve 906 and a steam inlet check valve 903 from left to right.

The six-way valve 901 has six vents in total. As shown in FIG1 , the two lower vents are connected to the steam outlet of the vaporization device 1 and the steam inlet of the steam working device 2 respectively. The four upper vents are arranged from left to right, with the first and third vents forming a group, and the second and fourth vents forming a group, respectively connected to the upper and lower ends of the sealed cylinder body 907. The six-way valve 901 has three states: one is a closed state, i.e., the two lower vents are closed, and the second is a group of three. The self-pressurizing device 9 introduces the high-pressure gas in the vaporizing device 1 into the sealed cylinder body 4 908 through the six-way valve 901, and indirectly drives the piston 3 905 to move by driving the piston 4 909, pressurizing the gas delivered by the tail steam recovery device 3, and delivering the pressurized gas to the inside of the liquefaction device 5 through the steam outlet check valve 3 904 and the steam outlet check valve 4 906.

The vaporization device 1 stores a liquid medium 7. In this embodiment, Freon with a boiling point of -29.8°C under an atmospheric pressure is used as the liquid medium 7. In this embodiment, the vaporization device 1, the vapor working device 2, the tail steam recovery device 3, the pressurizing device 4, the liquefaction device 5, and the liquid recovery device 6 are provided.

In conjunction with the example diagram, a Freon with a boiling point of -29.8°C under atmospheric pressure is selected as the liquid medium 7, the system is initially set to a vacuum, and an appropriate amount of liquid medium 7-Freon is injected to ensure that under the rated maximum operating temperature, the pressure vessel 101 in the vaporization device 1 still contains liquid Freon.

The initial state of the system is set as follows: the steam injection control valve 8 and the six-way valve 901 are in a closed state, the power unit 1 403 and the power unit 2 602 are in a closed state, the liquid control valve 501 is in an open state, and the electric water pump 103 is in a closed state.

In order to simplify the following description, the pressure in the vaporization device 1 is set to P1, and the temperature is set to T1; the exhaust pressure of the steam working device 2 is set to P2, and the temperature is set to T2; the pressure in the exhaust steam recovery device 3 is set to P3, and the temperature is set to T3; the pressure in the liquefaction device 5 is set to P4, and the temperature is set to T4. It should be noted that these values do not specifically refer to one or several constant numbers.

Working mode 1: single working mode of power unit 403.

The first step is to start the electric water pump 103 to pump the liquid medium 7 stored in the pressure vessel 101 in the vaporization device 1 into the air heat exchanger 102, and allow the liquid medium 7 to flow continuously between them. The liquid medium 7-Freon flowing through the air heat exchanger 102 absorbs heat from the air and is heated to a temperature close to the air temperature at that time. The heated Freon flows into the pressure vessel 101, and the overall temperature of the liquid medium 7 in the pressure vessel 101 continues to increase. When the temperature of the liquid medium 7 in the container rises to the boiling point of the Freon under the pressure state at that time, the Freon begins to vaporize. As the Freon continues to vaporize, the pressure in the pressure vessel 101 continues to rise until the temperature of the Freon in the pressure vessel 101 is consistent with the boiling point temperature under the pressure, reaching a saturated vaporization state, and the vaporization is temporarily stopped.

The second step is to start the power device 1 403 and adjust the pressure P3 in the tail steam recovery device 3 to keep it at the pressure requirement under the rated working state. The power device 1 403 pushes the piston 1 405 in the pressurizing device 4 to reciprocate, and the tail steam entering through the steam inlet check valve 1 401 or the steam inlet check valve 2 402 at the piston 1 405 end is discharged to the inside of the liquefaction device 5 through the steam outlet check valve 1 404 or the steam outlet check valve 2 406.

The third step is to control the steam injection control valve 8 to open and eject the steam in the vaporization device 1. At this time, the steam temperature is T1 and the pressure is P1. Since the tail steam recovery device 3 is covered outside the steam working device 2, the pressure value P2 at the tail of the steam working device 2 is the same as P3 and lower than P1. Therefore, the ejected steam moves toward the tail of the steam working device 2, driving the impeller in the steam turbine of the steam working device 2 to rotate and work, output power, and convert the heat energy in the steam into kinetic energy. As the heat energy in the steam is continuously converted into kinetic energy, the atmospheric pressure and temperature of the steam continue to decrease, and its volume increases. The atmospheric pressure of the exhaust steam after passing through the steam working device 2 is P2 and the temperature is T2. At this time, P2<P1, T2<T1.

Under the action of steam pressure, the exhaust steam enters the exhaust steam recovery device 3 and mixes with the steam therein, and the atmospheric pressure P3 and the temperature T3 increase. The increased P3 and T3 are close to the values of P2 and T2. Since the exhaust steam recovery device 3 is connected to the pressurizing device 4, part of the mixed exhaust steam enters the sealed cylinder body 407 of the pressurizing device 4 through the steam inlet check valve 401 or the steam inlet check valve 402.

Keep the power device 403 working continuously, push the piston 405 in the pressurizing device 4 to reciprocate, and discharge the gas at one end of the piston 405 into the liquefaction device 5 through the steam outlet check valve 404 or the steam outlet check valve 2 406. The internal pressure of the liquefaction device 5 is P4, and the internal temperature is T4. Since there is no heating and liquefaction begins, T4 is initially T3. With the continuous reciprocating motion of the piston 405, the gas in the liquefaction device 5 continues to increase, and the pressure P4 continues to increase. When the pressure P4 increases to the pressure value when the boiling point of the liquid medium 7 is T4, the liquefaction The gas in the device 5 begins to liquefy, releasing heat at the same time, reducing its volume, lowering P4 and increasing T4. When the reduced volume and increased temperature in the liquefaction device 5 are just offset by the new gas that continuously enters, P4 and T4 in the liquefaction device 5 remain stable and are in a vaporized saturated state. The liquefaction continues. Since the gas has undergone work in the gas working device 2, the heat energy contained in it is less than that in the initial stage. Therefore, the saturated vapor pressure in the liquefaction device 5 must be lower than the saturated vapor pressure in the vaporization device 1, and the temperature of the liquid after liquefaction, T4, must also be lower than T1.

Under the action of gravity, the liquefied liquid passes through the opened liquid control valve 501 and gathers in the liquid recovery device 6 located at the lower part of the liquefaction device 5.

In the fourth step, the control system (not shown in the drawings) detects that the liquid inside the liquid recovery device 6 is full. It should be noted that a timing method can also be used to close the liquid control valve 501, start the power device 2 602, drive the piston 2 604 to move, and re-inject the liquid inside the liquid recovery device 6 through the liquid outflow check valve 1 603 or the liquid outflow check valve 2 606 into the vaporization device 1 to complete a recycling process. Since the temperature of the recovered liquid is T4, which is lower than the temperature T1 in the vaporization device 1, the temperature of the liquid medium 7 in the vaporization equipment is reduced, completing a cycle of converting heat into kinetic energy.

Working mode 2: dual working mode of power device 403 and self-pressurizing device 9.

The first step is to start the electric water pump 103 to pump the liquid medium 7 stored in the pressure vessel 101 of the vaporization device 1 into the air heat exchanger 102, and allow the liquid medium 7 to flow continuously between them. The liquid medium 7-Freon flowing through the air heat exchanger 102 absorbs heat from the air and is heated to a temperature close to the air temperature at that time. The heated Freon flows into the pressure vessel 101, and the overall temperature of the liquid medium 7 in the pressure vessel 101 continues to increase. When the temperature of the liquid medium 7 in the container rises to the boiling point of the Freon under the pressure state at that time, the Freon begins to vaporize. As the Freon continues to vaporize, the pressure in the pressure vessel 101 continues to rise until the temperature of the Freon in the pressure vessel 101 is consistent with the boiling point temperature under the pressure, reaching a saturated vaporization state, and the vaporization is temporarily stopped.

At the same time, the control system (not shown in the figure) uses the gas in the tail steam recovery device 3 to The pressure sensor (not shown in the drawings) detects the value of the pressure P3 therein. If the value of P3 is higher than the air pressure required for rated operation, the power device 403 is started to drive the pressurizing device 4 to work, thereby reducing the pressure P3 in the exhaust steam recovery device 3 and adjusting the pressure P3 to an appropriate level. Under working conditions, the value of P3 should be less than the pressure P1 in the vaporization device 1.

The second step is to open the vent hole of the six-way valve 901, keep the two vent holes below the six-way valve 901 connected to the vaporizing device 1 and the vapor working device 2 unobstructed, push the slider in the six-way valve 901 to move, open one of the three vent holes or the two four vent holes inside, and close the other one, so that the high-pressure vapor in the vaporizing device 1 enters one end of the piston 4 909 in the sealed cylinder body 4 908 through one or two vent holes in the six-way valve 901, and the high-pressure vapor at the other end of the piston 4 909 in the sealed cylinder body 4 908 is discharged. , flows into the steam working device 2 through the three or four air holes in the six-way valve 901, and the high-pressure steam pushes the piston four 909 in the sealed cylinder body four 908 to move toward one end, thereby driving the piston three 905 connected thereto to move in the sealed cylinder body three 907. As the piston three 905 moves in the sealed cylinder body three 907, the tail steam entering through the steam inlet check valve five 902 or the steam inlet check valve six 903 at one end of the piston three 905 is discharged into the interior of the liquefaction device 5 through the steam outlet check valve three 904 or the steam outlet check valve four 906.

The high-pressure steam flows from the three or four air holes in the six-way valve 901 to the steam working device 2, and completes the process of converting heat into kinetic energy through the steam working device 2. The tail steam enters the tail steam recovery device 3. At the same time, according to the power demand, the steam injection control valve 8 can be controlled to open, and the high-pressure steam in the vaporization device 1 can be sprayed out to perform work at the same time.

In addition, the control system (not shown in the figure) is located between the tail steam recovery device 3 and the liquefied The air pressure sensor in the device 5 (not shown in the drawings) detects the values of the pressures P3 and P4 therein. If the values of P3 and P4 are higher or lower than the air pressure values required for rated operation, the power device 403 is started to drive the pressurizing device 4 to work, thereby reducing the pressure P3 in the tail steam recovery device 3 and increasing the pressure value of P4 in the liquefaction device 5, so as to keep the values of P3 and P4 at appropriate levels.

The third step is to control the six-way valve 901 to continuously switch between the one-three-group vent mode and the two-four-group vent mode, and decide whether to maintain the operation of the power device 1 403 according to the status of the pressure values P3 and P4.

Through the reciprocating motion of the piston 3 905 in the self-pressurizing device 9 and the piston 1 405 in the pressurizing device 4, the tail steam in the tail steam recovery device 3 is pressurized and discharged to the inside of the liquefaction device 5 through the steam outlet check valve 3 904 or the steam outlet check valve 4 906, and the steam outlet check valve 1 404 or the steam outlet check valve 2 406. In this embodiment, the steam outlet check valve 1 404, the steam outlet check valve 2 406, the steam outlet check valve 3 904, and the steam outlet check valve 4 906 share a steam outlet pipeline, that is, the branch pipe 2 13; the steam inlet check valve 1 401, the steam inlet check valve 2 402, the steam inlet check valve 5 902, and the steam inlet check valve 6 903 share a steam inlet pipeline, that is, the branch pipe 1 12. The internal pressure of the liquefaction device 5 is P4, and the internal temperature is T4. Since there is no heating and liquefaction begins, T4 is initially T3. With the continuous reciprocating motion of piston three 905 and piston one 405, the gas in the liquefaction device 5 continues to increase, and the pressure continues to rise. When the internal pressure P4 of the liquefaction device 5 increases to the pressure value when the boiling point of the liquid medium 7 is T4, the gas in the liquefaction device 5 begins to liquefy, and at the same time releases heat, the volume decreases, resulting in a decrease in P4 and an increase in T4. When the reduced volume and increased temperature in the liquefaction device 5 are just offset by the continuous entry of new gas, At this time, P4 and T4 in the liquefaction device 5 remain stable and are in a vaporized saturated state, and liquefaction continues.

Step 4: When the control system (not shown in the drawings) detects that the liquid inside the liquid recovery device 6 is full, it should be noted that a timing method can also be used to close the liquid control valve 501, start the power device 2 602, and through the movement of the piston 2 604, the liquid inside the liquid recovery device 6 passes through the liquid outflow check valve 1 603 or the liquid outflow check valve 2 606 and is re-injected into the vaporization device 1 to complete a recycling process. Since the temperature of the recovered liquid is T4, which is lower than the temperature T1 inside the vaporization device 1, the temperature of the liquid medium 7 in the vaporization device 1 is reduced, completing a cycle of converting heat into kinetic energy.

The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

A sealed tail steam recovery pneumatic system, characterized in that it comprises a vaporization device (1), a steam working device (2), a tail steam recovery device (3), a pressurizing device (4), a liquefaction device (5), and a liquid recovery device (6);

The vaporization device (1) can convert the liquid medium thereinto a vapor state, and its vapor outlet end and liquid inlet end are respectively connected to the vapor inlet end of the vapor working device (2) and the liquid outlet end of the liquid recovery device (6) by means of a sealed connection;

The steam working device (2) is connected to the tail steam recovery device (3) and/or is located inside the tail steam recovery device (3); one end of the tail steam recovery device (3) is connected to the pressurizing device (4), and/or the pressurizing device (4) is located inside the tail steam recovery device (3);

The pressurizing device (4) is driven to pressurize the gas delivered by the tail steam recovery device (3), and is connected to the liquefaction device (5);

The liquefaction device (5) can change the gas pressurized by the pressurizing device (4) from a gas state to a liquid state, and is connected to the liquid recovery device (6);

The liquefaction recovery device can transport the liquid liquefied by the liquefaction device (5) back to the vaporization device (1).
The sealed exhaust steam recovery pneumatic system according to claim 1 is characterized by further comprising a liquid medium (7) located in the vaporization device (1) for vaporization and circulation.
The sealed exhaust steam recovery pneumatic system according to claim 1 is characterized in that the steam outlet end of the exhaust steam recovery device (3) is connected to the steam inlet end of the pressurizing device (4), and the output end of the pressurizing device (4) is connected to the steam inlet end of the liquefaction device (5).
The sealed exhaust steam recovery pneumatic system according to claim 1 is characterized in that the pressurizing device (4) includes a sealed cylinder body (407) and a piston (405) slidably arranged inside the sealed cylinder body, one end of the sealed cylinder body (407) is provided with a steam inlet check valve (401) and a steam outlet check valve (404) in sequence, and the other end of the sealed cylinder body (407) is provided with a steam inlet check valve (402) and a steam outlet check valve (406) in sequence.
The sealed exhaust steam recovery pneumatic system according to claim 4 is characterized in that the exhaust gas recovery device is connected to the steam inlet check valve 1 (401) and the steam inlet check valve 2 (402) respectively through a branch pipe 1 (12), and the liquefaction device (5) is connected to the steam outlet check valve 1 (404) and the steam outlet check valve 2 (406) respectively through a branch pipe 2 (13).
The sealed exhaust steam recovery pneumatic system according to claim 1 is characterized in that a power device (403) is connected to the piston (405).
The sealed exhaust steam recovery pneumatic system according to claim 1 is characterized in that a steam injection control valve (8) is provided on the steam outlet end of the vaporization device (1), and a liquid control valve (501) is provided at the connection point between the liquid recovery device (6) and the liquefaction device (5).
The sealed exhaust steam recovery pneumatic system according to claim 1 is characterized in that the vaporization device (1) comprises an air heat exchanger (102) and a pressure vessel (101), and the air heat exchanger (102) is connected to the pressure vessel (101).
The sealed exhaust steam recovery pneumatic system according to claim 1 is characterized in that it also includes a self-pressurizing device (9), wherein the self-pressurizing device (9) is driven by the high-pressure steam in the vaporizing device (1) and can pressurize the steam delivered by the exhaust steam recovery device (3). It is connected to the liquefaction device (5).
The sealed exhaust steam recovery pneumatic system according to claim 2 is characterized in that the liquid medium (7) is a liquid with a relatively low boiling point under normal atmospheric pressure.