CN110332347B - Pressure control valve in liquid ammonia hydrogen production system - Google Patents
Pressure control valve in liquid ammonia hydrogen production system Download PDFInfo
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- CN110332347B CN110332347B CN201910641372.5A CN201910641372A CN110332347B CN 110332347 B CN110332347 B CN 110332347B CN 201910641372 A CN201910641372 A CN 201910641372A CN 110332347 B CN110332347 B CN 110332347B
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- valve rod
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 70
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000001257 hydrogen Substances 0.000 title claims abstract description 21
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 230000009471 action Effects 0.000 claims description 6
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 8
- 239000005329 float glass Substances 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 229910021529 ammonia Inorganic materials 0.000 description 14
- 238000003860 storage Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Pressure (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a pressure control valve in a liquid ammonia hydrogen production system, and belongs to the technical field of float glass preparation. The pressure control valve comprises a valve body, an inlet and an outlet, a control cavity, a compensation cavity, a first buffer cavity and a second buffer cavity are arranged in the valve body, a main valve rod is slidably connected in the control cavity, the control cavity is communicated with the inlet, the column valve rod is simultaneously inserted into the compensation cavity, the first buffer cavity and the second buffer cavity, a control piston is fixedly arranged on the auxiliary valve rod, a first tension spring in a stretching state is connected between the control piston and the main valve rod, a second tension spring in the stretching state is arranged between the control piston and the valve body, and the elastic coefficient of the first tension spring is larger than that of the second tension spring. The invention has the advantages of compensating the pressure change, enabling the outlet pressure to be stable and constant, and the like.
Description
Technical Field
The invention belongs to the technical field of float glass preparation, and relates to a pressure control valve in a liquid ammonia hydrogen production system.
Background
In the float glass production process, hydrogen is used for keeping inert or weak reducing atmosphere in a tin bath, the pressure in the tin bath is maintained, and oxygen in air is isolated from contacting with tin at high temperature so as to prevent metallic tin from being oxidized. Enterprises generally select hydrogen production devices with high cost performance to obtain sufficient hydrogen by using an electrolytic water hydrogen production device or an ammonia decomposition hydrogen production device, and the problems and the solutions which occur when an ammonia decomposition hydrogen production system operates are mainly introduced.
The outsourcing liquid ammonia is transported to the department by the tank wagon and discharged into the liquid ammonia tank for centralized storage, and the pressure of the liquid ammonia tank is far higher than the working pressure of the ammonia decomposing furnace of the ammonia decomposing hydrogen production system, so that the liquid ammonia is depressurized by the depressurization valve and then is supplied to the ammonia decomposing furnace, and the depressurized ammonia pressure is required to be stable and free from fluctuation.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a liquid ammonia hydrogen production system, and the technical problem to be solved by the invention is how to keep the outlet pressure relatively stable, so that the change of the inlet pressure has little influence on the outlet pressure.
The aim of the invention can be achieved by the following technical scheme: the pressure control valve in the liquid ammonia hydrogen production system is characterized by comprising a valve body, an inlet and an outlet, wherein a control cavity, a compensation cavity, a first buffer cavity and a second buffer cavity are arranged in the valve body, a main valve rod is slidably connected to the control cavity and is communicated with the inlet, the column valve rod is simultaneously inserted into the compensation cavity, the first buffer cavity and the second buffer cavity, the control cavity is communicated with the compensation cavity through overflow holes, a first stop block capable of limiting the size of an intercommunication section between the compensation cavity and the first buffer cavity is fixedly arranged on the main valve rod, a second stop block capable of limiting the size of an intercommunication section between the first buffer cavity and the second buffer cavity is fixedly arranged on the main valve rod, the outlet is communicated with the second buffer cavity, an auxiliary valve rod coaxial with the main valve rod is slidably connected to the valve body, a control piston is fixedly arranged on the auxiliary valve rod, a first tension spring in a tension state is connected between the control piston and the main valve rod, a second tension spring in a tension coefficient in a tension state is arranged between the control piston and the main valve rod, and the second tension spring in a tension spring state is arranged between the control piston and the valve body, and the tension spring is in a second elasticity coefficient in a tension coefficient state is larger than the first tension coefficient;
when the inlet pressure is reduced, the return force of the first tension spring and the second tension spring acts, and the intercommunicating cross section between the compensation cavity and the first buffer cavity and the intercommunicating cross section between the first buffer cavity and the second buffer cavity are reduced.
Under normal pressure, namely when liquid ammonia is not in-between, under the action of the first tension spring and the second tension spring, the first stop block and the second stop block are respectively stopped at corresponding positions, so that the outlet is closed.
Because the pressure of liquid ammonia in the liquid ammonia storage tank is gradually reduced in the use process, however, the relatively stable air supply pressure is required for the ammonia decomposing furnace, the ammonia decomposing furnace can be regulated through the pressure control valve, specifically, the pressure difference received by two sides of the control piston drives the first tension spring to be pulled, the second tension spring is pressed, the restoring force of the first tension spring and the second tension spring drives the first check block and the second check block to be closed, the pressure difference in each cavity drives the first check block and the second check block to be opened, when the pressure of the liquid ammonia is reduced, the driving force of the control piston, which is driven by the control piston to stretch the first tension spring, is also reduced, the restoring force of the tension spring is acted, the pressure spring is shortened, but the control piston is kept far away from the main valve rod, so that the main valve rod moves downwards, the section of each liquid discharge caliber of the first check block and the second check block is increased, or the pressure required for opening the through flow section is reduced, or the through flow section is larger under the same pressure, the decompression effect of the whole pressure control valve is weakened, and the outlet pressure is kept in a stable state.
The control piston has a tendency to move away from the main valve stem because the control piston has a much larger cross-sectional area under pressure than the main valve stem.
The two pressure control valves are arranged to ensure the stable reliability of air supply and ensure that the maintenance does not affect the continuous operation of the system.
In the pressure control valve in the liquid ammonia hydrogen production system, the control piston is slidably connected to the valve body, one end of the main valve rod is slidably connected to the valve body, and the other end of the main valve rod is slidably connected to the control piston.
The control piston under the action of the first tension spring and the second tension spring not only can enable the outlet to be in a closed state in an initial state and improve the buffering effect, but also can be matched with the control piston to enable the change of the inlet pressure to be displayed on the discharge flow rate of the outlet in a non-linear inverse proportion mode, and the discharge pressure is basically kept unchanged when the liquid ammonia pressure is reduced.
In the pressure control valve in the liquid ammonia hydrogen production system, the pressure control valve further comprises a first pressure cavity and a second pressure cavity, the first pressure cavity and the second pressure cavity are separated by a sliding sleeve, a compensating valve rod which is connected to the sliding sleeve in a sliding mode is arranged between the first pressure cavity and the second pressure cavity, the compensating valve rod is connected to the sliding sleeve in a sliding mode, a brake block located in the first pressure cavity is fixedly arranged on the compensating valve rod, the inlet is communicated with the first pressure cavity, the first pressure cavity and the compensating cavity are separated by the brake block, the first pressure cavity and the compensating cavity can be communicated with each other through a gap between the brake block and the inner wall of the compensating cavity, a reset spring is connected between the brake block and the sliding sleeve, and the brake block can be abutted to the main valve rod.
Because the liquid ammonia tank is periodically replaced and is more frequent, the main valve rod is inevitably not corresponding to the instant position due to the fact that the pressure is larger at the instant moment when the liquid ammonia is connected to the pressure control valve, so that the situation that the outlet pressure is not the required pressure is avoided, in order to avoid the situation that the valve body is damaged or the decomposition furnace for ammonia is adversely affected, a compensation rod is arranged, the compensation rod can lock the main valve rod instantly under the driving of the pressure at the inlet, the pressure in a compensation cavity is gradually increased after the locking, a brake block is driven to be separated from the main valve rod, the main valve rod is regulated to the adaptive position, and the situation that the outlet pressure is overlarge at the instant when the liquid ammonia is inserted is avoided.
The return spring is pulled when the pressure difference at two sides of the brake block is large, however, the brake block is not sealed with the inner wall of the valve cavity, and an overflow gap exists, so that the pressure at two sides of the brake block can be slowly recovered to be normal, and moreover, the pressure of liquid ammonia in the compensation cavity can be gradually increased so as to balance the pressure difference at two sides of the brake block.
It is easy to see that the liquid nitrogen entering the compensation cavity is divided into two parts, one part enters the compensation cavity from the control cavity, the other part enters the first pressure cavity from the inlet and then enters the compensation cavity, the flowing directions of the two parts are mutually perpendicular, so that the pressure of the compensation cavity entering the adjacent first buffer cavity is stable, the link is a link with larger pressure shock amplitude, and the stability of the pressure is very important.
In the above-mentioned liquid nitrogen hydrogen production system, the first buffer chamber and the second buffer chamber are respectively provided with an adjusting component for respectively adjusting the volume sizes, the adjusting component comprises a shaft sleeve and an adjusting rod which is connected in the shaft sleeve in a sliding way, a valve plate is fixedly arranged on the adjusting rod, a gap is reserved between the valve plate positioned in the first buffer chamber and the inner wall of the first buffer chamber, a gap is reserved between the valve plate positioned in the second buffer chamber and the inner wall of the second buffer chamber, a variable chamber is formed between the adjusting rod and the shaft sleeve, the two variable chambers and the second pressure chamber are communicated, and the variable chamber and the second pressure chamber are filled with hydraulic oil.
Besides the flow section, the depressurization factor has the space size of the temporary storage area, that is, if the volume of each cavity after entering can be reduced along with the reduction of the inlet pressure in the process that the liquid ammonia enters the first buffer cavity from the compensation cavity and enters the second buffer cavity from the first buffer cavity, the liquid ammonia pressure can be buffered to carry out transition on the pressure change, and the pressure in the cavity after entering can be increased compared with the pressure in the same space and the same initial pressure condition, so that the larger change of the outlet pressure caused by the pressure reduction is prevented.
The reset spring is in a stretching state before the pressure is reduced, and recovers a certain length after the pressure is reduced, so that the volume of the first pressure cavity is reduced, and simultaneously, the volume of the second pressure cavity is also reduced, so that the two adjusting rods move towards the direction of the main valve rod, and the space of the first buffer cavity and the space of the second buffer cavity are reduced.
In the pressure control valve in the liquid ammonia hydrogen production system, the brake block is provided with a notch matched with the peripheral surface of the main valve rod.
Drawings
FIG. 1 is a schematic diagram of the structure of the liquid ammonia hydrogen production system.
Fig. 2 is a schematic diagram of the principle of the pressure control valve.
In the figure, 1, a liquid ammonia storage tank; 2. a decomposing furnace for ammonia; 3. connecting pipe; 4. a branch pipe; 5. a pressure control valve; 51. a valve body; 52. an inlet; 53. an outlet; 54. a control chamber; 55. a compensation chamber; 56. a first buffer chamber; 57. a second buffer chamber; 58. a main valve rod; 59. an auxiliary valve rod; 61. a first stopper; 62. a second stopper; 63. a control piston; 64. a first tension spring; 65. a second tension spring; 66. butterfly valve; 67. a first pressure chamber; 68. a second pressure chamber; 69. a compensating valve rod; 71. a brake block; 72. a return spring; 73. an adjusting rod; 74. a valve plate; 75. a variable cavity.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 and 2, the liquid ammonia hydrogen production system comprises a liquid ammonia storage tank 1, an ammonia decomposing furnace 2, a connecting pipe 3 for connecting the liquid ammonia storage tank 1 and the ammonia decomposing furnace 2, two branch pipes 4 are arranged on the connecting pipe 3 in parallel, a pressure control valve 5 is respectively arranged on each branch pipe 4, the pressure control valve 5 comprises a valve body 51, an inlet 52 and an outlet 53, a control cavity 54, a compensation cavity 55, a first buffer cavity 56 and a second buffer cavity 57 are arranged in the valve body 51, a main valve rod 58 is slidably connected in the control cavity 54, the control cavity 54 is communicated with the inlet 52, the column valve rod is simultaneously inserted in the compensation cavity 55, the first buffer cavity 56 and the second buffer cavity 57, the control cavity 54 is communicated with the compensation cavity 55 through overflow holes, a first stop block 61 capable of limiting the size of an intercommunication section between the compensation cavity 55 and the first buffer cavity 56 is fixedly arranged on the main valve rod 58, a second stop block 62 capable of limiting the size of the intercommunication section between the first buffer cavity 56 and the second buffer cavity 57 is fixedly arranged on the main valve rod 58, a tension spring 53 is communicated with the second buffer cavity 57, a tension spring 53 is slidably connected with the second buffer cavity 58, a lower piston 63 is fixedly arranged on the main valve rod 58, a piston 63 is fixedly connected with the second piston rod 64 is in a state between the second piston rod 58 and the second piston rod 64 and the second piston 58, and is in a state, and is in a high elastic coefficient 65 is in a state, and is in a high elastic coefficient 65 state, and is in a state 65 and connected with the auxiliary valve rod 63;
when the pressure of the inlet 52 is reduced, under the action of restoring forces of the first tension spring 64 and the second tension spring 65, the intercommunicating cross section between the compensation cavity 55 and the first buffer cavity 56 and the intercommunicating cross section between the first buffer cavity 56 and the second buffer cavity 57 are reduced;
a butterfly valve 66 is provided for each of the inlet 52 and outlet 53 of the pressure control valve 5.
Under normal pressure, namely when liquid ammonia is not in-between, under the action of the first tension spring 64 and the second tension spring 65, the first stop block 61 and the second stop block 62 are respectively blocked at corresponding positions, so that the outlet 53 is closed.
Since the pressure of the liquid ammonia in the liquid ammonia storage tank 1 is gradually reduced in the use process, however, the relatively stable air supply pressure is required for the decomposing furnace 2 for ammonia, the decomposing furnace can be adjusted through the pressure control valve 5, specifically, the pressure difference on two sides of the control piston 63 drives the first tension spring 64 to be pulled, the second tension spring 65 is pressed, the restoring force of the first tension spring 64 and the second tension spring 65 drives the first stop block 61 and the second stop block 62 to be closed, but the pressure difference in the respective cavities drives the first stop block 61 and the second stop block 62 to be opened, when the pressure of the liquid ammonia is reduced, the driving force of the control piston 63 driving the control piston 63 to stretch the first tension spring 64 is also reduced, the restoring force of the tension spring is acted, the pressure spring is shortened, but the control piston 63 keeps a state far away from the main valve rod 58, so that the main valve rod 58 moves downwards, the section of the first stop block 61 and the second stop block 62 for opening the respective liquid discharge caliber is increased, or the pressure required for opening the through flow section is reduced, or the through flow section under the equivalent pressure is larger, the decompression effect of the whole pressure control valve 5 is weakened, and the pressure of the outlet 53 maintains a stable state.
Control piston 63 tends to move away from main valve stem 58 because control piston 63 has a much larger cross-sectional area under compression than main valve stem 58.
The purpose of the two pressure control valves 5 is to ensure the stable reliability of the supply air, while at the same time the maintenance does not affect the continuous operation of the system.
The control piston 63 is slidably coupled to the valve body 51, one end of the main valve stem 58 is slidably coupled to the valve body 51, and the other end of the main valve stem 58 is slidably coupled to the control piston 63. The control piston 63 under the action of the first tension spring 64 and the second tension spring 65 can not only make the outlet 53 in the closed state in the initial state and improve the buffering effect, but also cooperate with the control piston 63 to make the change of the pressure of the inlet 52 in a nonlinear inverse proportion on the discharge flow rate of the outlet 53, so that the discharge pressure is basically kept unchanged when the liquid ammonia pressure is reduced.
The pressure control valve 5 further comprises a first pressure cavity 67 and a second pressure cavity 68, the first pressure cavity 67 and the second pressure cavity 68 are separated by a sliding sleeve, a compensating valve rod 69 which is connected to the sliding sleeve in a sliding mode is arranged between the first pressure cavity 67 and the second pressure cavity 68, the compensating valve rod 69 is connected to the compensating cavity 55 in a sliding mode, the compensating valve rod 69 is connected to the sliding sleeve in a sliding mode, a brake block 71 which is located in the first pressure cavity 67 is fixedly arranged on the compensating valve rod 69, the inlet 52 is communicated with the first pressure cavity 67, the first pressure cavity 67 and the compensating cavity 55 are separated through the brake block 71, the first pressure cavity 67 and the compensating cavity 55 can be communicated with the inner wall of the compensating cavity 55 through gaps between the brake block 71 and the sliding sleeve, a reset spring 72 is connected between the brake block 71 and the sliding sleeve, and the brake block 71 can be abutted against the main valve rod 58. Because the liquid ammonia tank is periodically replaced and is more frequent, at the moment of liquid ammonia being connected to the pressure control valve 5, the main valve rod 58 is inevitably not corresponding to the moment due to the larger pressure, so that the pressure of the outlet 53 is not the required pressure, in order to avoid the situation that the valve body 51 is damaged or the decomposition furnace 2 for ammonia is adversely affected, a compensation rod is arranged, the compensation rod can be used for locking the main valve rod 58 at the moment under the driving of the pressure of the inlet 52, the pressure in the compensation cavity 55 is gradually increased after the locking, the brake block 71 is driven to be separated from the main valve rod 58, the main valve rod 58 is regulated to the adapting position, and the situation that the pressure of the outlet 53 is overlarge at the moment of liquid ammonia intervention is avoided.
The return spring 72 is pulled when the pressure difference between the two sides of the brake block 71 is large, however, the brake block 71 and the inner wall of the valve cavity are not sealed, and an overflow gap exists, so that the pressure of the two sides of the brake block 71 can be slowly restored to be normal, and furthermore, the pressure of liquid ammonia in the compensation cavity 55 can be gradually increased so as to balance the pressure difference between the two sides of the brake block 71.
It can be seen that the liquid nitrogen entering the compensation chamber 55 is divided into two parts, one part enters the compensation chamber 55 from the control chamber 54, the other part enters the first pressure chamber 67 from the inlet 52 and then enters the compensation chamber 55, and the flow directions of the two parts are mutually perpendicular, so that the pressure of the compensation chamber 55 entering the adjacent first buffer chamber 56 is stable, and the link is a link with larger pressure shock amplitude, and the stability of the pressure is very important.
The first buffer chamber 56 and the second buffer chamber 57 are respectively provided with an adjusting component for adjusting the volume of each of the first buffer chamber 56 and the second buffer chamber 57, the adjusting component comprises a shaft sleeve and an adjusting rod 73 which is slidably connected in the shaft sleeve, a valve plate 74 is fixedly arranged on the adjusting rod 73, a gap is reserved between the valve plate 74 positioned in the first buffer chamber 56 and the inner wall of the first buffer chamber 56, a gap is reserved between the valve plate 74 positioned in the second buffer chamber 57 and the inner wall of the second buffer chamber 57, a variable chamber 75 is formed between the adjusting rod 73 and the shaft sleeve, the two variable chambers 75 and the second pressure chamber 68 are communicated, and the variable chamber 75 and the second pressure chamber 68 are filled with hydraulic oil.
The pressure reducing factor is that besides the flow section, there is a space size of the temporary storage area, that is, if the volume of each cavity after entering can be reduced along with the reduction of the pressure of the inlet 52 in the process that the liquid ammonia enters the first buffer cavity 56 from the compensation cavity 55 and enters the second buffer cavity 57 from the first buffer cavity 56, the pressure of the liquid ammonia is buffered, the pressure change is transited, and the pressure in the cavity after entering can be increased compared with the condition of the same initial pressure in the same space, so that the pressure change of the outlet 53 caused by the pressure reduction is prevented.
The return spring 72 is in tension before the pressure is reduced, and after the pressure is reduced, the return spring returns to a certain length to reduce the volume of the first pressure chamber 67, and simultaneously the volume of the second pressure chamber 68 is reduced to move the two adjusting rods 73 toward the main valve rod 58 to reduce the space between the first buffer chamber 56 and the second buffer chamber 57.
The stop block 71 has a recess adapted to the circumference of the main valve stem 58.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (2)
1. The pressure control valve in the liquid ammonia hydrogen production system is characterized in that the pressure control valve (5) comprises a valve body (51), an inlet (52) and an outlet (53), a control cavity (54), a compensation cavity (55), a first buffer cavity (56) and a second buffer cavity (57) are arranged in the valve body (51), a main valve rod (58) is slidably connected in the control cavity (54), the control cavity (54) is communicated with the inlet (52), the main valve rod (58) is simultaneously inserted into the compensation cavity (55), the first buffer cavity (56) and the second buffer cavity (57), the control cavity (54) is communicated with the compensation cavity (55) through overflow holes, a first stop block (61) capable of limiting the size of an intercommunication section between the compensation cavity (55) and the first buffer cavity (56) is fixedly arranged on the main valve rod (58), a second stop block (62) capable of limiting the size of a section between the first buffer cavity (56) and the second buffer cavity (57) is fixedly arranged on the main valve rod (58), the second stop block (53) is coaxially communicated with the auxiliary valve rod (59) and fixedly arranged on the auxiliary valve rod (59), a first tension spring (64) in a stretching state is connected between the control piston (63) and the main valve rod (58), a second tension spring (65) in a stretching state is arranged between the control piston (63) and the valve body (51), and the elastic coefficient of the first tension spring (64) is larger than that of the second tension spring (65);
when the pressure of the inlet (52) is reduced, under the action of restoring forces of the first tension spring (64) and the second tension spring (65), the intercommunicating cross section between the compensation cavity (55) and the first buffer cavity (56) and the intercommunicating cross section between the first buffer cavity (56) and the second buffer cavity (57) are reduced;
the control piston (63) is slidably connected to the valve body (51), one end of the main valve rod (58) is slidably connected to the valve body (51), and the other end of the main valve rod (58) is slidably connected to the control piston (63);
the pressure control valve (5) further comprises a first pressure cavity (67) and a second pressure cavity (68), the first pressure cavity (67) and the second pressure cavity (68) are separated by a sliding sleeve, a compensating valve rod (69) which is connected to the sliding sleeve in a sliding mode is arranged between the first pressure cavity (67) and the second pressure cavity (68), the compensating valve rod (69) is connected to the sliding sleeve in a sliding mode in the compensating cavity (55), a brake block (71) which is located in the first pressure cavity (67) is fixedly arranged on the compensating valve rod (69), the inlet (52) is communicated with the first pressure cavity (67), the first pressure cavity (67) and the compensating cavity (55) are separated by the brake block (71), the first pressure cavity (67) and the compensating cavity (55) can be communicated with each other through a gap between the brake block (71) and the inner wall of the compensating cavity (55), a return spring (72) is connected to the compensating valve rod (71) in a sliding mode, and the brake block (71) can be abutted against the valve rod (58);
the inlet 52 and the outlet 53 of each pressure control valve 5 are respectively provided with a butterfly valve (66);
the hydraulic buffer device is characterized in that an adjusting component for adjusting the volume of each buffer cavity (56) and the volume of each buffer cavity (57) are respectively arranged in the first buffer cavity (56) and the second buffer cavity (57), each adjusting component comprises a shaft sleeve and an adjusting rod (73) which is connected in the shaft sleeve in a sliding mode, a valve plate (74) is fixedly arranged on each adjusting rod (73), a gap is reserved between each valve plate (74) located in the first buffer cavity (56) and the inner wall of the first buffer cavity (56), a gap is reserved between each valve plate (74) located in the second buffer cavity (57) and the inner wall of the second buffer cavity (57), a variable cavity (75) is formed between each adjusting rod (73) and the shaft sleeve, and the two variable cavities (75) and the second pressure cavity (68) are communicated with each other, and hydraulic oil is filled in each variable cavity (75) and each second pressure cavity (68).
2. A pressure control valve in a liquid ammonia hydrogen production system according to claim 1, wherein the brake block (71) has a recess adapted to the circumference of the main valve stem (58).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910641372.5A CN110332347B (en) | 2019-07-16 | 2019-07-16 | Pressure control valve in liquid ammonia hydrogen production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910641372.5A CN110332347B (en) | 2019-07-16 | 2019-07-16 | Pressure control valve in liquid ammonia hydrogen production system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110332347A CN110332347A (en) | 2019-10-15 |
| CN110332347B true CN110332347B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910641372.5A Active CN110332347B (en) | 2019-07-16 | 2019-07-16 | Pressure control valve in liquid ammonia hydrogen production system |
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| Country | Link |
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| CN (1) | CN110332347B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1428843A (en) * | 1972-06-08 | 1976-03-17 | Abex Corp | Flow control valve |
| JPH05346181A (en) * | 1992-06-12 | 1993-12-27 | Kayaba Ind Co Ltd | Pressure compensation type flow control valve |
| WO1998036197A1 (en) * | 1997-02-12 | 1998-08-20 | Komatsu Ltd. | Pressure compensating valve and directional control valve system using it |
| EP2317195A1 (en) * | 2009-11-02 | 2011-05-04 | Techspace Aero S.A. | Shut-off valve with pressure balancing system |
| CN207278485U (en) * | 2017-10-19 | 2018-04-27 | 咸宁南玻玻璃有限公司 | It is a kind of to ensure safe air supply system |
| CN110329990A (en) * | 2019-07-16 | 2019-10-15 | 咸宁南玻玻璃有限公司 | A kind of liquefied ammonia hydrogen generating system |
| CN210566503U (en) * | 2019-07-16 | 2020-05-19 | 咸宁南玻玻璃有限公司 | Pressure control valve in liquid ammonia hydrogen production system |
| CN210595251U (en) * | 2019-07-16 | 2020-05-22 | 咸宁南玻玻璃有限公司 | Liquid ammonia hydrogen production system |
-
2019
- 2019-07-16 CN CN201910641372.5A patent/CN110332347B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1428843A (en) * | 1972-06-08 | 1976-03-17 | Abex Corp | Flow control valve |
| JPH05346181A (en) * | 1992-06-12 | 1993-12-27 | Kayaba Ind Co Ltd | Pressure compensation type flow control valve |
| WO1998036197A1 (en) * | 1997-02-12 | 1998-08-20 | Komatsu Ltd. | Pressure compensating valve and directional control valve system using it |
| EP2317195A1 (en) * | 2009-11-02 | 2011-05-04 | Techspace Aero S.A. | Shut-off valve with pressure balancing system |
| CN207278485U (en) * | 2017-10-19 | 2018-04-27 | 咸宁南玻玻璃有限公司 | It is a kind of to ensure safe air supply system |
| CN110329990A (en) * | 2019-07-16 | 2019-10-15 | 咸宁南玻玻璃有限公司 | A kind of liquefied ammonia hydrogen generating system |
| CN210566503U (en) * | 2019-07-16 | 2020-05-19 | 咸宁南玻玻璃有限公司 | Pressure control valve in liquid ammonia hydrogen production system |
| CN210595251U (en) * | 2019-07-16 | 2020-05-22 | 咸宁南玻玻璃有限公司 | Liquid ammonia hydrogen production system |
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|---|---|
| CN110332347A (en) | 2019-10-15 |
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