A temperature and pressure reduction system

Abstract

The present invention discloses a temperature reduction and pressure reduction system, which comprises: a pipeline assembly; a steam pressure reducing valve, which is installed at the other end of the mixing pipeline; a temperature reduction assembly, which comprises a temperature reducer installed on the mounting seat and one end of which extends into the mixing pipeline, a check valve connected to the other end of the temperature reducer, a regulating valve connected to the check valve, a filter connected to the regulating valve, and a stop valve connected to the filter; a spring safety valve, which is installed on the mixing pipeline and located downstream of the temperature reducer; a pressure gauge; and a thermometer. It can not only ensure the constant pressure in the pipeline assembly, but also realize the full mixing of the temperature reducing water and the steam, which is conducive to improving the uniformity of the steam temperature after the temperature reduction.

Description

Technical Field

[0001] The invention belongs to the technical field of desuperheaters, and in particular relates to a desuperheating and decompression system. Background Art

[0002] The steam desuperheater is controlled by the signal from the temperature controller and is an operating component in the temperature control system. The desuperheater's task is to spray the amount of water corresponding to the signal received by the actuator evenly into the steam pipe. The steam desuperheater is installed on the steam pipe and cooperates with the regulating valve to form a complete desuperheating and pressure reduction system. However, the existing desuperheating and pressure reduction system is prone to low mixing efficiency due to unreasonable structural design and layout; and there is a hidden danger of causing pipeline overpressure. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a temperature and pressure reduction system in order to overcome the deficiencies of the prior art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: a temperature reduction and pressure reduction system, which comprises:

[0005] A pipeline assembly, the pipeline assembly comprising a mixing pipeline and a plurality of delivery pipelines connected to one end of the mixing pipeline and connected end to end, and a mounting seat communicating with the mixing pipeline is arranged on the outer wall of the mixing pipeline;

[0006] A steam pressure reducing valve installed at the other end of the mixing pipe;

[0007] a temperature reducing assembly, the temperature reducing assembly comprising a temperature reducing device mounted on the mounting seat and having one end extending into the mixing pipe, a check valve connected to the other end of the temperature reducing device, a regulating valve connected to the check valve, a filter connected to the regulating valve, and a stop valve connected to the filter;

[0008] a spring safety valve, the spring safety valve being installed on the mixing pipe and being located downstream of the desuperheater;

[0009] A pressure gauge, which is installed on the delivery pipeline and cooperates with the spring safety valve;

[0010] A thermometer is installed on the delivery pipeline and cooperates with the regulating valve.

[0011] Optimally, the desuperheater and the check valve, the check valve and the regulating valve, the regulating valve and the filter, and the filter and the stop valve are independently connected via pipelines.

[0012] Optimally, the other end of the mixing pipe is a Venturi structure, and the mounting seat is located downstream of the Venturi structure.

[0013] Optimally, the delivery pipeline and the mixing pipeline, as well as the delivery pipelines themselves, are independently connected via flanges.

[0014] Optimally, the desuperheater comprises:

[0015] A valve assembly, the valve assembly comprising a pipe body, a first mounting flange formed in the middle of the outer wall of the pipe body, a second mounting flange mounted at one end of the pipe body, a nozzle mounted at the other end of the pipe body, and a flow channel; a mounting hole is provided on the side of the nozzle, a plurality of flange holes are provided on the second mounting flange, and the flow channel penetrates the second mounting flange and the pipe body and extends to communicate with the mounting hole;

[0016] The nozzle assembly comprises a nozzle body fixed at the mounting hole and having a through hole in the center, and a valve core mechanism adjustably inserted in the mounting hole and sealed with the nozzle body. The nozzle body is also provided with a plurality of flow holes connecting the through hole and the flow channel.

[0017] Furthermore, the valve core mechanism includes a valve core inserted into the through hole and extending into the flow channel, a locking nut installed at the inner end of the valve core and located in the flow channel, an adjusting nut installed on the valve core and located between the locking nut and the nozzle body, and a spring sleeved on the valve core and located between the adjusting nut and the nozzle body.

[0018] Furthermore, the valve core includes a rod body penetrating the through hole, a sealing cone formed at the outer end of the rod body, and a slot hole opened on the end surface of the sealing cone.

[0019] Furthermore, the nozzle body includes a sealing column embedded in the mounting hole and sealed with the nozzle, and a fixing column formed on the end surface of the sealing column and fixed on the side of the nozzle, and the through hole passes through the fixing column and the sealing column.

[0020] Furthermore, a plurality of the circulation holes are arranged around the through hole; each of the circulation holes includes a first hole segment opened in the fixing column and a second hole segment opened in the sealing column and communicating with the first hole segment, and the first hole segment is arranged obliquely.

[0021] Furthermore, the pipe body is formed by smoothly connecting a first pipe section and a second pipe that are perpendicular to each other, the second mounting flange is installed at the free end of the first pipe section, the first mounting flange is formed on the circumferential surface of the second pipe, and the nozzle is installed at the free end of the second pipe.

[0022] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the temperature reduction and pressure reduction system of the present invention, through the cooperation of pipeline components, steam pressure reducing valves, temperature reduction components, spring safety valves, etc., can not only ensure the constancy of the pressure in the pipeline components, but also achieve sufficient mixing of temperature reduction water and steam, which is beneficial to improving the uniformity of the steam temperature after temperature reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the temperature reduction and pressure reduction system of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a desuperheater of a desuperheating and decompression system of the present invention;

[0025] Figure 3 for Figure 2 AA section view;

[0026] Figure 4 for Figure 3 A partial enlarged view of

[0027] Figure 5 It is a structural schematic diagram of the nozzle body of the desuperheater of the desuperheating and decompression system of the present invention;

[0028] Figure 6 It is a structural schematic diagram of a regulating valve in the temperature and pressure reduction system of the present invention;

[0029] Figure 7 An exploded diagram of a regulating valve in the temperature and pressure reduction system of the present invention;

[0030] Figure 8 The figure is a cross-sectional view of a regulating valve in the temperature reduction and pressure reduction system of the present invention. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in detail below.

[0032] like Figure 1 The temperature and pressure reduction system shown mainly includes a steam pressure reducing valve 1, a pipeline assembly, a temperature reduction assembly, a spring safety valve 5, a pressure gauge 6 and a thermometer 7, etc.

[0033] The pipeline assembly includes a mixing pipeline 4 and a plurality of delivery pipelines 40 connected to one end of the mixing pipeline 4 and connected end to end. A mounting seat 42 communicating with the mixing pipeline 4 is provided on the outer wall of the mixing pipeline 4. The steam pressure reducing valve 1 is installed at the other end of the mixing pipeline 4. The temperature reduction assembly includes a desuperheater 2 installed on the mounting seat 42 and one end extending into the mixing pipeline 4, a check valve 3 connected to the other end of the desuperheater 2, a regulating valve 10 connected to the check valve 3, a filter 9 connected to the regulating valve 10, and a stop valve 8 connected to the filter 9. The spring safety valve 5 is installed on the mixing pipeline 4 and is located downstream of the desuperheater 2 to avoid excessive pressure in the mixing pipeline 4. The pressure gauge 6 is installed on the delivery pipeline 40 and cooperates with the spring safety valve 5 to display the pressure in the delivery pipeline 40; a commercially available intelligent pressure gauge can be used and connected to the actuator of the spring safety valve 5 through a commercially available PLC controller, so that the automatic control of the spring safety valve 5 can be achieved through the digital signal of the intelligent pressure gauge. The thermometer 7 is installed on the delivery pipeline 40 and cooperates with the regulating valve 10 , and can also be connected to the aforementioned PLC controller, so as to realize automatic control of the regulating valve 10 by utilizing the signal of the thermometer 7 .

[0034] In this embodiment, the desuperheater 2 and the check valve 3, the check valve 3 and the regulating valve 10, the regulating valve 10 and the filter 9, and the filter 9 and the stop valve 8 are independently connected by pipelines. The other end of the mixing pipeline 4 is a venturi structure 41, and the mounting seat 42 is located downstream of the venturi structure 41. The delivery pipeline 40 and the mixing pipeline 4, and the delivery pipelines 40 are independently connected by flanges.

[0035] The above-mentioned desuperheater 2 (i.e., back pressure insertion desuperheater), such as Figures 2 to 5 As shown, it mainly includes a valve assembly 1' and a nozzle assembly 2' used in conjunction with each other.

[0036] The valve assembly 1' includes a pipe body 11', a first mounting flange 12', a second mounting flange 13', a nozzle 14' and a flow channel 15'. The first mounting flange 12' is formed in the middle of the outer wall (i.e., the outer peripheral surface) of the pipe body 11', and the formation method can be one-piece molding or welding; the first mounting flange 12' is used to connect with the pipe for conveying steam so as to install the entire back pressure type insertion desuperheater on the pipe for conveying steam and allow part of the back pressure type insertion desuperheater to be inserted into the pipe. The second mounting flange 13' is installed at one end of the pipe body 11, and a plurality of flange holes 131' are opened on it, which can be connected to the pipe for conveying cooling water through a plurality of bolts. The nozzle 14' is installed at the other end of the pipe body 11', and a mounting hole 141' is opened on its side; when the back pressure type insertion desuperheater is installed on the pipe for conveying steam, the nozzle is accommodated in the pipe. The flow channel 15' passes through the second mounting flange 13' and the pipe body 11', and extends to communicate with the mounting hole 141'; that is, the flow channel 15' passes through the second mounting flange 13', extends from one end of the pipe body 11' to the other end thereof, and communicates with the mounting hole 141' for the inflow of cooling water.

[0037] The nozzle assembly 2' comprises a nozzle body 21' fixed at the mounting hole 141' and having a through hole 20' in the center, and a valve core mechanism 22' adjustable and inserted in the mounting hole 141' and sealed with the nozzle body 21', and the through hole 20' is not a conventional regular shape but corresponds to the valve core mechanism 22'. The nozzle body is also provided with a plurality of flow holes connecting the through hole 20' and the flow channel 15', and the plurality of flow holes are arranged around the through hole 20'.

[0038] In this embodiment, the valve core mechanism 22' includes a valve core 221' which is penetrated in the through hole 20' and extends into the flow channel 15', a locking nut 222' which is installed at the inner end of the valve core 221' and located in the flow channel 15', an adjusting nut 223' which is installed on the valve core 221' and located between the locking nut 222' and the nozzle body 21', and a spring 224' which is sleeved on the valve core 221' and located between the adjusting nut 223' and the nozzle body 21'; in this way, the cooling water applies pressure to the valve core 221' through the circulation hole to overcome the elastic force of the spring 224' to cause it to deform, at which time the sealing state of the valve core 221' and the nozzle body 21' is released, and the cooling water flows into the pipe for conveying steam and mixes with the steam.

[0039] In this embodiment, the valve core 221' includes a rod body 2211' passing through the through hole 20', a sealing cone 2212' formed at the outer end of the rod body 2211', and a slot 2213' opened on the end surface of the sealing cone 2212'; the shape of the through hole 20' corresponds to the valve core 221' to facilitate sealing. The nozzle body 21' includes a sealing column 212' embedded in the mounting hole 141' and sealed with the nozzle 14', and a fixed column 211' formed on the end surface of the sealing column 212' and fixed to the side of the nozzle 14' (fixed by welding), and the through hole 20' passes through the fixed column 211' and the sealing column 212'. Each flow hole includes a first hole section 215' opened in the fixed column 211' and a second hole section 214' opened in the sealing column 212' and communicating with the first hole section 215'. The first hole section 215' is inclined and its diameter gradually increases from the inside to the outside, which is conducive to the spraying of cooling water. The pipe body 11' is formed by smoothly connecting the first pipe section and the second pipe perpendicular to each other. The second mounting flange 13' is installed at the free end of the first pipe section, the first mounting flange 12' is formed on the circumference of the second pipe, and the nozzle 14' is installed at the free end of the second pipe.

[0040] The regulating valve 10 can be a conventional one available on the market, or can be a conventional one such as Figures 6 to 8 As shown, in order to improve the mixing effect, it mainly includes a matching valve assembly 1" and a valve plate assembly 2".

[0041] Among them, the valve assembly 1" includes a valve body 11", a connecting flange 13" formed on the two end surfaces of the valve body 11" (the connecting flange 13" is usually integrally formed with the valve body 11", and a plurality of connecting holes 14" are opened thereon to cooperate with the mounting bolts, so that the regulating valve is installed between two pipes), a flow channel 12" is opened in the valve body 11" and passes through the two connecting flanges 13" (that is, the flow channel 12" is opened at the center of the valve body 11" and the connecting flange 13"), a first connecting seat 15" is arranged on the outer peripheral surface of the valve body 11" and communicated with it, and a second connecting seat 16" is arranged on the outer peripheral surface of the valve body 11" and opposite to the first connecting seat 15" (the second connecting seat 16" and the first connecting seat 15" are coaxially arranged). The valve plate assembly 2" includes a rotatable valve stem 21" (the valve stem 21" can be rotatable in the existing conventional manner) which is inserted into the first connecting seat 15" via the second connecting seat 16" and the flow channel 12", a valve plate 22" installed on the valve stem 21" and matched with the flow channel 12" (the valve plate 22" includes a connecting sleeve which is sleeved on the valve stem 21" and a sealing head formed on the side of the connecting sleeve, and the outer surface of the sealing head has a convex arc surface), a first sealing member 24" installed in the first connecting seat 15", and a second sealing assembly installed in the second connecting seat 16" and matched with the valve stem 21".

[0042] In this embodiment, both ends of the flow channel 12" have concave ring portions 122" extending to the outer ends thereof, such that the outer diameter of the concave ring portion 122" is greater than the outer diameter of other portions of the flow channel 12". The valve assembly 1" also includes two sleeves 17" and two sleeve limiters 18", the two sleeves 17" are inserted in the flow channel 12" and are located on both sides of the valve stem 21"; the sizes of the two sleeves 17" can be adjusted accordingly according to the size of the flow channel 12", but their structures are roughly the same, specifically: each sleeve 17" includes a tube body 171" and a convex ring 172" formed on the outer peripheral surface of the tube body 171" and coaxial with the tube body 171", the convex ring 172" separates the outer peripheral surface of the tube body 171" into a first face portion and a second face portion (the second face portion is located outside the first face portion), the inner wall of the flow channel 12" contacts the first face portion, the convex ring 172" abuts against the concave ring portion 122", and an empty space is formed between the second face portion and the concave ring portion 122"; the two sleeve limiters 18" are detachably installed in the empty space to limit the corresponding sleeve 17" from relative displacement.

[0043] In the present embodiment, the materials of the sleeve 17" and the valve plate 22" are independently tungsten carbide, which makes good use of the erosion and corrosion resistance of carbides (metal carbides, such as tungsten carbide, etc.), and can cleverly combine the mechanical strength of the metal with the hardness and wear resistance of tungsten carbide, thereby improving the service life of the valve plate, achieving better comprehensive performance and lower production costs, and having greater practical and economic value. The concave ring portion 122" is provided with an internal thread, and the outer surface of the sleeve limiter 18" is provided with an external thread matching the internal thread; the sleeve limiter 18" is a retaining ring, which is sleeved on the second surface portion and abuts against the convex ring 172"; a groove can be provided on the outer end surface of the sleeve limiter 18" to facilitate the installation and removal of the sleeve limiter 18".

[0044] In this embodiment, the valve plate 22" has an arcuate sealing surface 221" that matches with any end of the sleeve 17", that is, the convex arc surface of the outer surface of the aforementioned sealing head, which can be sealed with the end of the sleeve 17" of a smaller size. The valve plate assembly 2" also includes a first bearing 23" sleeved on the valve stem 21" and located in the first connecting seat 15", and a second bearing 25" sleeved on the valve stem 21" and located in the second connecting seat 16"; that is, the valve stem 21" is rotatable through the first bearing 23" and the second bearing 25". The first sealing member 24" is a sealing end cover; the second sealing assembly 5" includes a packing seat 26" arranged in the second connecting seat 16" and located on the outside of the second bearing 25", a packing 27" located on the outside of the packing seat 26" and filled between the valve stem 21" and the second connecting seat 16", a packing gland 28" sleeved on the valve stem 21" and located on the outside of the packing 27", and a pressure plate 29" installed on the outer end surface of the second connecting seat 16" through a fastener 20" and in conflict with the packing gland 28"; on the one hand, it can achieve the sealing between the valve assembly 1" and the valve plate assembly 2", and on the other hand, it is also convenient for its disassembly and maintenance, which is conducive to improving the service life. The fastener 20" includes a plurality of screw pins 201" and nuts 202" matched with the plurality of screw pins 201". In this embodiment, the axial centerline of the valve stem 21" does not intersect with the axial centerline of the flow channel 12", ensuring that the valve has better sealing performance.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature and pressure reduction system, characterized in that it include: A pipeline assembly, the pipeline assembly comprising a mixing pipeline (4) and a plurality of delivery pipelines (40) connected to one end of the mixing pipeline (4) and connected end to end, wherein a mounting seat (42) in communication with the mixing pipeline (4) is provided on an outer wall of the mixing pipeline (4); A steam pressure reducing valve (1), the steam pressure reducing valve (1) being installed at the other end of the mixing pipe (4); A temperature reduction assembly, the temperature reduction assembly comprising a temperature reducer (2) mounted on the mounting seat (42) and having one end extending into the mixing pipe (4), a check valve (3) connected to the other end of the temperature reducer (2), a regulating valve (10) connected to the check valve (3), a filter (9) connected to the regulating valve (10), and a stop valve (8) connected to the filter (9); a spring safety valve (5), the spring safety valve (5) being installed on the mixing pipe (4) and located downstream of the desuperheater (2); a pressure gauge (6), the pressure gauge (6) being installed on the delivery pipeline (40) and cooperating with the spring safety valve (5); a thermometer (7), the thermometer (7) being installed on the delivery pipeline (40) and cooperating with the regulating valve (10); The desuperheater (2) comprises: A valve assembly (1'), the valve assembly (1') comprising a pipe body (11'), a first mounting flange (12') formed in the middle of an outer wall of the pipe body (11'), a second mounting flange (13') mounted at one end of the pipe body (11'), a nozzle (14') mounted at the other end of the pipe body (11'), and a flow channel (15'); a mounting hole (141') is provided on a side of the nozzle (14'), a plurality of flange holes (131') are provided on the second mounting flange (13'), and the flow channel (15') penetrates the second mounting flange (13') and the pipe body (11') and extends to communicate with the mounting hole (141'); A nozzle assembly (2'), the nozzle assembly (2') comprising a nozzle body (21') fixed at the mounting hole (141') and having a through hole (20') at the center thereof, and a valve core mechanism (22') adjustably inserted into the mounting hole (141') and cooperating and sealing with the nozzle body (21'), the nozzle body also having a plurality of flow holes communicating with the through hole (20') and the flow channel (15'); The valve core mechanism (22') comprises a valve core (221') penetrating the through hole (20') and extending into the flow channel (15'), a locking nut (222') installed at the inner end of the valve core (221') and located in the flow channel (15'), an adjusting nut (223') installed on the valve core (221') and located between the locking nut (222') and the nozzle body (21'), and a spring (224') sleeved on the valve core (221') and located between the adjusting nut (223') and the nozzle body (21'); The nozzle body (21') comprises a sealing column (212') embedded in the mounting hole (141') and sealed with the nozzle (14'), and a fixing column (211') formed on the end surface of the sealing column (212') and fixed to the side of the nozzle (14'), and the through hole (20') passes through the fixing column (211') and the sealing column (212'); A plurality of the flow holes are arranged around the through hole (20'); each of the flow holes comprises a first hole section (215') opened in the fixing column (211') and a second hole section (214') opened in the sealing column (212') and communicating with the first hole section (215'); the first hole section (215') is arranged obliquely.

2. The temperature and pressure reduction system according to claim 1, characterized in that: The desuperheater (2) and the check valve (3), the check valve (3) and the regulating valve (10), the regulating valve (10) and the filter (9), and the filter (9) and the stop valve (8) are independently connected to each other via pipelines.

3. The temperature and pressure reduction system according to claim 1, characterized in that: The other end of the mixing pipe (4) is a Venturi structure (41), and the mounting seat (42) is located downstream of the Venturi structure (41).

4. The temperature and pressure reduction system according to claim 1, characterized in that: The delivery pipeline (40) and the mixing pipeline (4) as well as the delivery pipelines (40) are independently connected to each other via flanges.

5. The temperature and pressure reduction system according to claim 1, characterized in that: The valve core (221') comprises a rod body (2211') passing through the through hole (20'), a sealing cone (2212') formed at the outer end of the rod body (2211'), and a slot (2213') provided on the end surface of the sealing cone (2212').

6. The temperature and pressure reduction system according to claim 1, characterized in that: The pipe body (11') is formed by smoothly connecting a first pipe section and a second pipe which are perpendicular to each other, the second mounting flange (13') is mounted on the free end of the first pipe section, the first mounting flange (12') is formed on the circumference of the second pipe, and the nozzle (14') is mounted on the free end of the second pipe.

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