A device for reducing the temperature and pressure of steam

Abstract

The present application relates to the technical field of fluid temperature and pressure reduction, and in particular to a device for reducing the temperature and pressure of steam, which comprises a steam input pipeline, a pilot pressure reducing valve and a steam output pipeline which are connected end to end in sequence, the steam output pipeline being connected with a temperature reduction circuit, the pilot valve core of the pilot pressure reducing valve being always tightly closed, a feedback control circuit for dynamically stabilizing the output pressure value of the pilot pressure reducing valve according to the difference between the output pressure of the pilot pressure reducing valve and the output pressure of the steam output pipeline being arranged between the leakage port of the pilot pressure reducing valve and the steam output pipeline, the connection point between the feedback control circuit and the steam output pipeline being arranged after the connection point between the temperature reduction circuit and the steam output pipeline, and the present application has the effect of improving the accuracy of the pressure value of the steam flow after temperature and pressure reduction.

Description

Technical Field

[0001] The present application relates to the technical field of fluid temperature and pressure reduction, and in particular to a steam temperature and pressure reduction device. Background Art

[0002] In the textile industry, steam is widely used in processes such as fabric pretreatment, printing and dyeing, and can significantly improve the quality of fabric printing and dyeing. Steam is mainly generated by external factories and transported to textile manufacturers for use. However, the steam provided by external factories is mostly high-temperature and high-pressure superheated steam for easy transportation. Direct use of superheated steam is prone to cause fabric migration and permanent stains during the alkali boiling process, or it is easy to cause slurry, fiber, etc. to solidify on the cloth guide roller, causing adverse effects on the smooth operation of the fabric. Therefore, in textile production, it is necessary to convert high-temperature and high-pressure superheated steam into low-temperature and low-pressure saturated steam for use.

[0003] At present, the conversion of high-temperature and high-pressure superheated steam into low-temperature and low-pressure saturated steam is usually achieved by using a superheated steam desuperheater and a pressure reducer. The principle is to first allow the high-temperature and high-pressure superheated steam to pass through a pressure reducing valve to reduce the pressure and then cool it down with desuperheating water, so that it is converted into saturated steam for output. However, in the above method, since the high-temperature and high-pressure superheated steam is first decompressed and then cooled with desuperheating water, the desuperheating water becomes a part of the saturated steam after being cooled after evaporation due to heat, resulting in a change in the output air pressure, resulting in a certain deviation from the air pressure value output by the pressure reducing valve, which will shorten the service life of the air pressure drive equipment that requires high precision, and even cause damage to the fabric processed in the equipment in severe cases. Summary of the invention

[0004] In order to improve the accuracy of the steam flow pressure value after temperature and pressure reduction, the present application provides a steam temperature and pressure reduction device.

[0005] The present application provides a steam temperature and pressure reduction device that adopts the following technical solution:

[0006] A steam temperature and pressure reduction device comprises a steam input pipeline, a pilot pressure reducing valve and a steam output pipeline which are connected end to end in sequence, the steam output pipeline is connected with a cooling circuit, the pilot valve core of the pilot pressure reducing valve is always tightly closed, a feedback control circuit for dynamically stabilizing the output air pressure value of the pilot pressure reducing valve according to the difference between the output air pressure of the pilot pressure reducing valve and the output air pressure of the steam output pipeline is arranged between the external leakage port of the pilot pressure reducing valve and the steam output pipeline, and the connection point between the feedback control circuit and the steam output pipeline is arranged after the connection point between the cooling circuit and the steam output pipeline.

[0007] By adopting the above technical scheme, a feedback control loop is set in the pressure reducing loop composed of the steam input pipeline, the pilot pressure reducing valve and the steam output pipeline. During operation, the steam output from the pilot pressure reducing valve passes through the cooling loop, and part of the steam is diverted to the feedback control loop, and indirectly acts on the preload force of the pressure relief port of the pilot pressure reducing valve. Since the output air pressure of the pilot pressure reducing valve is determined by the minimum value between the external leakage port and the preload force applied to the pilot valve core, but the pilot valve core is always closed in the above setting, the output pressure of the pilot pressure reducing valve is controlled by the preload force of the pressure relief port, and the preload force of the pressure relief port is affected by the output steam pressure of the steam output pipeline, thereby dynamically adjusting the output pressure of the pilot pressure reducing valve to improve the stability of the steam pressure of the steam output pipeline after cooling.

[0008] Optionally, the feedback control loop includes a connecting part, which is provided with a first channel and a second channel, one end of the first channel is connected to the leakage port of the pilot pressure reducing valve, and the other end is connected to the exhaust port, one end of the second channel is connected to the steam output pipe, and the other end is connected to the exhaust port, the first channel and the second channel are respectively provided with a first opening and closing component and a second opening and closing component for controlling the opening and closing states of the two, and the connecting part is also provided with a regulating component for driving the second opening and closing component to dynamically adjust the preload force of the first opening and closing component according to the air pressure value at the inlet of the second channel, the preload force provided by the first opening and closing component plus the preload force provided by the regulating component, and the preload force provided by the second opening and closing component plus the preload force provided by the regulating component, both of which are the same as the output air pressure value required by the steam output pipeline.

[0009] By adopting the above technical solution, a first opening and closing component is arranged in the first channel of the receiving part, and the first opening and closing component provides a pre-tightening condition for opening the first channel. When the input pressure of the pilot pressure reducing valve is greater than or equal to the pre-tightening force provided by the first component, the first channel is opened. At this time, the steam pressure output by the pilot pressure reducing valve is equal to the pre-tightening force of the first opening and closing component; then, the steam output from the pilot pressure reducing valve is cooled and pressurized by the cooling circuit, and part of it enters from the second channel of the receiving part to overcome the pre-tightening force output of the second opening and closing component. At this time, the second opening and closing component feeds back to the first opening and closing component through the regulating component, and changes the pre-tightening force of the first opening and closing component to change the pressure value of the steam output by the pilot pressure reducing valve to maintain its dynamic stability.

[0010] Optionally, the first opening and closing assembly includes a first pre-tightening bolt that passes through and is threadedly connected to the side wall of the receiving portion, a first pre-tightening spring fixed to one end of the first pre-tightening bolt, and a first valve core fixedly connected to an end of the first pre-tightening spring that is away from the first pre-tightening bolt, and the first valve core is arranged toward the external leakage port of the pilot pressure reducing valve.

[0011] By adopting the above technical solution, a pre-tightening force is provided for opening the first channel.

[0012] Optionally, the second opening and closing assembly includes a second pre-tightening bolt that passes through and is threadedly connected to the side wall of the receiving portion, a second pre-tightening spring fixed to one end of the second pre-tightening bolt, and a second valve core fixedly connected to an end of the second pre-tightening spring that is away from the second pre-tightening bolt, and the second valve core is arranged toward the steam output pipe.

[0013] By adopting the above technical solution, a pre-tightening force is provided for opening the second channel.

[0014] Optionally, the regulating component includes a socket fixedly connected to the second valve core, the socket passes through the partition side wall between the first channel and the second channel, the portion of the socket located at the first channel is fixedly connected to a third preload spring, both ends of the third preload spring are respectively fixedly connected to the socket and the first valve core, the first preload spring and the third preload spring are arranged in the same direction, a sliding track is provided on the side wall between the first channel and the second channel of the socket, the socket is slidably connected in the sliding track, and a sealing sliding component is also provided in the sliding track for keeping the first channel and the second channel isolated from each other during the sliding process of the socket.

[0015] By adopting the above technical scheme, the receiving part is slidably connected to the sliding track, and the receiving part is fixedly connected to the second valve core. When the second valve core is opened, the second valve core is caused to be displaced to varying degrees according to the difference between the steam pressure in the steam output pipeline and the preload force applied to the second valve core, thereby driving the third preload spring in the first channel to stretch according to the displacement distance, thereby reducing the preload force applied to the first valve core, indirectly reducing the output pressure value of the pilot-operated pressure reducing valve, and thus reducing the pressure value of the steam output pipeline; and when the pressure value of the steam output pipeline decreases, through the above structure, it can be known that the preload force applied to the first valve core will be increased, thereby realizing dynamic pressure stabilization of the steam flow output from the steam output pipeline; and the sealing sliding component provided prevents the fluids in the first channel and the second channel from communicating with each other.

[0016] Optionally, the volume of the portion of the sliding track connected to the first channel and the second channel is smaller than the volume of the sliding track on the inner wall of the receiving part, and the sliding component is a sealing block, which is slidably connected to the sliding track and fixedly connected to the receiving part, and the sealing block always completely covers the opening of the sliding track connecting to the first channel and the second channel.

[0017] By adopting the above technical solution, the provided sealing block moves synchronously with the sliding of the receiving member, and always isolates the fluids in the first channel and the second channel.

[0018] Optionally, the cooling circuit includes a check valve, a linear regulating valve, a throttle valve and a stop valve which are connected in sequence through the ends of the pipeline, the inlet end of the stop valve is connected to the cooling water inlet pipeline, and the check valve is connected to the steam output pipeline.

[0019] By adopting the above technical solution, the check valve, linear regulating valve, throttle valve and stop valve constitute the basic functions of controlling the flow and preventing backflow of the cooling water, so that the cooling water can be stably input into the steam output pipeline.

[0020] Optionally, a water vapor separation device is arranged in series on the steam output pipeline, and the water vapor separation device is arranged between the connection point between the check valve and the feedback control loop and the steam output pipeline.

[0021] By adopting the above technical solution, the water vapor separation device is set to separate the partially condensed or unevaporated water from the steam after cooling, so as to avoid pipeline disturbance caused by gas-liquid mixing.

[0022] Optionally, a bypass valve is connected in parallel to the steam input pipeline and the steam output pipeline, and the connection points between the bypass valve and the two are respectively located before the pilot pressure reducing valve and after the connection point between the feedback control loop and the steam output pipeline.

[0023] By adopting the above technical solution, the bypass valve is used temporarily when a failure occurs in the main circuit to avoid shutdown of the device.

[0024] Optionally, a safety valve is provided on the steam output pipeline, and a connection point between the safety valve and the steam output pipeline is located after the bypass valve.

[0025] By adopting the above technical solution, the safety valve is provided to ensure pressure relief protection when an accident occurs in the circuit.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Through the connection part, the steam in the steam output pipeline is used to reversely stabilize the pilot pressure reducing valve, thereby reducing the pressure increase problem of the cooling circuit, making the steam flow pressure output by the steam output pipeline more consistent with the pressure value of the equipment, and increasing the service life of the equipment;

[0028] 2. By setting the sliding track and the sealing block, the receiving part is set to ensure that the first channel and the second channel remain in an isolated state while sliding. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 2 It is a schematic diagram of the structure of the receiving part of an embodiment of the present application.

[0031] Description of reference numerals:

[0032] 1. Steam input pipeline; 2. Pilot pressure reducing valve; 3. Steam output pipeline; 4. Cooling circuit; 41. Check valve; 42. Linear stroke regulating valve; 43. Throttle valve; 44. Stop valve; 5. Feedback control circuit; 51. Socket; 52. First channel; 53. Second channel; 54. First opening and closing assembly; 541. First pre-tightening bolt; 542. First pre-tightening spring; 543. First valve core; 55. Second opening and closing assembly; 551. Second pre-tightening bolt; 552. Second pre-tightening spring; 553. Second valve core; 56. Control assembly; 561. Socket; 562. Third pre-tightening spring; 563. Sliding track; 564. Sealing block; 6. Water vapor separation device; 7. Bypass valve; 8. Safety valve. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-2 This application is described in further detail.

[0034] The present application discloses a device for reducing the temperature and pressure of steam. Figure 1 A steam temperature and pressure reduction device comprises a steam input pipeline 1, a pilot pressure reducing valve 2 and a steam output pipeline 3 which are connected end to end in sequence, and the three are arranged horizontally. The steam output pipeline 3 is connected with a cooling circuit 4, and the cooling circuit 4 comprises a check valve 41, a linear regulating valve 42, a throttle valve 43 and a stop valve 44 which are connected end to end through the pipeline in sequence. The inlet end of the stop valve 44 is connected with a cooling water inlet pipeline, and the check valve 41 is connected with the steam output pipeline 3. A water vapor separation device 6 is arranged in series on the steam output pipeline 3, and the water vapor separation device 6 is arranged after the connection point between the check valve 41 and the steam output pipeline 3.

[0035] The pilot valve core of the pilot pressure reducing valve 2 is always tightly closed, and a connecting part 51 is connected in parallel between the leakage port of the pilot pressure reducing valve 2 and the steam output pipeline 3, which constitutes a feedback control loop 5 together with the pilot pressure reducing valve 2 and the steam output pipeline 3. The connection point between the connecting part 51 and the steam output pipeline 3 is located after the water vapor separation device 6.

[0036] Reference Figure 1 and Figure 2A first channel 52 and a second channel 53 are provided on the receiving portion 51. One end of the first channel 52 is connected to the leakage port of the pilot-operated pressure reducing valve 2, and the other end is connected to the exhaust port. One end of the second channel 53 is connected to the steam output pipeline 3, and the other end is connected to the exhaust port. The first channel 52 and the second channel 53 are respectively provided with a first opening and closing component 54 and a second opening and closing component 55 for controlling the opening and closing states of the two. A regulating component 56 is also provided on the receiving portion 51.

[0037] The first opening and closing assembly 54 includes a first pre-tightening bolt 541 that passes through and is threadedly connected to the side wall of the receiving portion 51, a first pre-tightening spring 542 fixed to one end of the first pre-tightening bolt 541, and a first valve core 543 fixedly connected to the end of the first pre-tightening spring 542 that is away from the first pre-tightening bolt 541. The first valve core 543 is arranged toward the external leakage port of the pilot-operated pressure reducing valve 2.

[0038] The second opening and closing assembly 55 includes a second pre-tightening bolt 551 that passes through and is threadedly connected to the side wall of the receiving portion 51, a second pre-tightening spring 552 fixed to one end of the second pre-tightening bolt 551, and a second valve core 553 fixedly connected to the end of the second pre-tightening spring 552 that is away from the second pre-tightening bolt 551. The second valve core 553 is arranged toward the steam output pipe 3.

[0039] The first valve core 543 and the second valve core 553 are arranged in opposite opening directions, and the first preload spring 542 and the second preload spring 552 are arranged in parallel.

[0040] The regulating component 56 includes a socket 561 fixedly connected to the second valve core 553, the socket 561 passes through the partition side wall between the first channel 52 and the second channel 53, the socket 561 is located in the first channel 52 and is fixedly connected to a third preload spring 562, both ends of the third preload spring 562 are respectively fixedly connected to the socket 561 and the first valve core 543, the first preload spring 542 and the third preload spring 562 are arranged in the same direction, and a sliding track 563 in the same direction as the third preload spring 562 is opened on the side wall between the first channel 52 and the second channel 53 of the socket 51, and the volume of the part of the sliding track 563 connected to the first channel 52 and the second channel 53 is smaller than the volume of the sliding track 563 on the inner wall of the socket 51.

[0041] The supporting member 561 is slidably connected in the sliding track 563. A sealing sliding component is also provided in the sliding track 563 for keeping the first channel 52 and the second channel 53 isolated from each other during the sliding of the supporting member 561. The sliding component is a sealing block 564. The sealing block 564 is slidably connected to the sliding track 563, and the sealing block 564 is integrally formed with the supporting member 561. The sealing block 564 always completely covers the opening connecting the sliding track 563 with the first channel 52 and the second channel 53, thereby isolating the first channel 52 from the second channel 53.

[0042] Through the above arrangement, the first valve core 543 and the second valve core 553 are respectively subjected to the preload force of the first preload spring 542 and the second preload spring 552, and are also subjected to the preload force of the third preload spring 562. When the initial position is maintained, the preload force of the first valve core 543 and the second valve core 553 is equal to the predetermined value of the steam output pipeline 3. The high-temperature and high-pressure superheated steam is first output from the pilot pressure reducing valve 2, and the pressure is reduced to the preload force of the first valve core 543. After cooling and pressurizing in the water vapor separation process, part of the steam flows to the second channel of the receiving portion 51. 53, and pushes open the second valve core 553. At this time, the second valve core 553 is opened, and the third preload spring 562 is stretched. The preload force on the second valve core 553 increases to be the same as the force of the steam flow. The stretching of the third preload spring 562 causes the preload force of the first valve core 543 to decrease, so that the output steam pressure of the pilot-operated pressure reducing valve 2 is reduced, thereby reducing the steam pressure output from the steam output pipe 3 and reducing the preload force on the second valve core 553. At this time, the third spring retracts, and the preload force on the first valve core 543 increases, thereby realizing dynamic regulation.

[0043] A bypass valve 7 is connected in parallel to the steam input pipeline 1 and the steam output pipeline 3. The connection points between the bypass valve 7 and the two are respectively located in front of the pilot pressure reducing valve 2 and after the connection point between the receiving part 51 and the steam output pipeline 3. A safety valve 8 is also arranged in parallel on the steam output pipeline 3. The connection point between the safety valve 8 and the steam output pipeline 3 is located after the bypass valve 7.

[0044] The implementation principle of a steam temperature and pressure reduction device in an embodiment of the present application is as follows: high-temperature and high-pressure superheated steam is introduced into a pilot-operated pressure reducing valve 2 to reduce temperature and pressure, and then subjected to a cooling and water vapor separation process before being output from a steam output pipe 3 .

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steam temperature and pressure reducing device, comprising a steam input pipeline (1), a pilot pressure reducing valve (2) and a steam output pipeline (3) connected end to end in sequence, characterized in that: The steam output pipeline (3) is connected to a cooling circuit (4), the pilot valve core of the pilot pressure reducing valve (2) is always tightly closed, and a feedback control circuit (5) is provided between the external leakage port of the pilot pressure reducing valve (2) and the steam output pipeline (3) for dynamically stabilizing the output pressure value of the pilot pressure reducing valve (2) according to the difference between the output pressure of the pilot pressure reducing valve (2) and the output pressure of the steam output pipeline (3), and the connection point between the feedback control circuit (5) and the steam output pipeline (3) is arranged after the connection point between the cooling circuit (4) and the steam output pipeline (3); The feedback control loop (5) comprises a receiving portion (51), the receiving portion (51) being provided with a first channel (52) and a second channel (53), one end of the first channel (52) being connected to an external leakage port of the pilot-operated pressure reducing valve (2), and the other end being connected to an exhaust port, one end of the second channel (53) being connected to the steam output pipe (3), and the other end being connected to the exhaust port, and a first opening and closing component (54) and a second opening and closing component (55) for controlling the opening and closing states of the first channel (52) and the second channel (53) being respectively provided in the first channel (52) and the second channel (53). The receiving portion (51) is also provided with a regulating component (56) for driving the second opening and closing component (55) to dynamically adjust the preload force of the first opening and closing component (54) according to the air pressure value at the inlet of the second channel (53), wherein the sum of the preload force provided by the first opening and closing component (54) plus the preload force provided by the regulating component (56) and the sum of the preload force provided by the second opening and closing component (55) plus the preload force provided by the regulating component (56) are the same as the required output air pressure value of the steam output pipeline (3).

2. The device for reducing the temperature and pressure of steam according to claim 1, characterized in that: The first opening and closing assembly (54) comprises a first pre-tightening bolt (541) penetrating through and threadedly connected to a side wall of the receiving portion (51), a first pre-tightening spring (542) fixed to one end of the first pre-tightening bolt (541), and a first valve core (543) fixedly connected to one end of the first pre-tightening spring (542) facing away from the first pre-tightening bolt (541), wherein the first valve core (543) is arranged toward an external leakage port of the pilot-operated pressure reducing valve (2).

3. A steam temperature and pressure reduction device according to claim 2, characterized in that: The second opening and closing assembly (55) comprises a second pre-tightening bolt (551) penetrating through and threadedly connected to the side wall of the receiving portion (51), a second pre-tightening spring (552) fixed to one end of the second pre-tightening bolt (551), and a second valve core (553) fixedly connected to one end of the second pre-tightening spring (552) facing away from the second pre-tightening bolt (551), wherein the second valve core (553) is arranged toward the steam output pipe (3).

4. The device for reducing the temperature and pressure of steam according to claim 3, characterized in that: The regulating component (56) comprises a receiving member (561) fixedly connected to the second valve core (553), the receiving member (561) passing through the side wall separating the first channel (52) and the second channel (53), a third preload spring (562) fixedly connected to the receiving member (561) located in the first channel (52), two ends of the third preload spring (562) respectively fixedly connected to the receiving member (561) and the first valve core (543), the first preload spring (562) The tightening spring (542) and the third pre-tightening spring (562) are arranged in the same direction, and a sliding track (563) is provided on the side wall between the first channel (52) and the second channel (53) of the receiving part (51), and the receiving part (561) is slidably connected in the sliding track (563). The sliding track (563) is also provided with a sealing sliding component for keeping the first channel (52) and the second channel (53) isolated from each other during the sliding process of the receiving part (561).

5. The device for reducing the temperature and pressure of steam according to claim 4, characterized in that: The volume of the portion of the sliding track (563) communicating with the first channel (52) and the second channel (53) is smaller than the volume of the sliding track (563) on the inner wall of the receiving portion (51); the sliding component is a sealing block (564); the sealing block (564) is slidably connected to the sliding track (563); and the sealing block (564) is fixedly connected to the receiving portion (561); the sealing block (564) always completely covers the opening of the sliding track (563) communicating with the first channel (52) and the second channel (53).

6. The device for reducing the temperature and pressure of steam according to claim 1, characterized in that: The cooling circuit (4) comprises a check valve (41), a linear regulating valve (42), a throttle valve (43) and a stop valve (44) which are connected in sequence through pipelines. The inlet end of the stop valve (44) is connected to the cooling water inlet pipeline, and the check valve (41) is connected to the steam output pipeline (3).

7. The device for reducing the temperature and pressure of steam according to claim 6, characterized in that: A water vapor separation device (6) is arranged in series on the steam output pipeline (3), and the water vapor separation device (6) is arranged between the connection point between the check valve (41) and the feedback control loop (5) and the steam output pipeline (3).

8. The device for reducing the temperature and pressure of steam according to claim 1, characterized in that: A bypass valve (7) is connected in parallel to the steam input pipeline (1) and the steam output pipeline (3), and the connection points between the bypass valve (7) and the two are respectively located before the pilot pressure reducing valve (2) and after the connection point between the feedback control loop (5) and the steam output pipeline (3).

9. The device for reducing the temperature and pressure of steam according to claim 8, characterized in that: The steam output pipeline (3) is connected to a safety valve (8), and the connection point between the safety valve (8) and the steam output pipeline (3) is located after the bypass valve (7).

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