Natural gas hydrogen blending device and system

Abstract

The application relates to the field of gas turbine power generation technology and discloses a natural gas hydrogen mixing device and system, which comprises an adjusting tank, a piston, a first limiting piece, a second limiting piece, a mixing tank, a hydrogen communication mechanism, a natural gas communication mechanism and a safety valve. The piston is arranged in a containing cavity and divides the containing cavity into a hydrogen chamber and a natural gas chamber. The first limiting piece is connected with the adjusting tank and located in the hydrogen chamber. The second limiting piece is connected with the adjusting tank and located in the natural gas chamber. The safety valve is connected with the adjusting tank and communicates with the hydrogen chamber. The natural gas hydrogen mixing device can ensure that the pressure of the hydrogen chamber and the pressure of the natural gas chamber are basically equal under the working condition with hydrogen supply, so that the hydrogen mixing ratio of the natural gas is ensured to be in a preset range, and the hydrogen is ensured to be preferentially combusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine power generation technology, in particular to a natural gas hydrogen mixing device and system. BACKGROUND

[0002] There is a problem for hydrogen combustion of gas turbine, hydrogen comes from hydrogen-containing tail gas of surrounding industrial users, hydrogen amount is uncertain and has large fluctuation; for gas turbine design, too much and rapid change of hydrogen content will affect the stability of gas turbine combustion, cause detonation and vibration and other adverse factors, affect the stability of gas turbine shafting, and seriously damage the gas turbine; therefore, gas turbine manufacturers often require that the hydrogen content of natural gas mixing cannot exceed a certain proportion, on the other hand, hydrogen cannot be stored in large quantities, and the pipeline network requires that if there is hydrogen in the pipeline, hydrogen should be mixed into combustion first and cannot be stored in large quantities. SUMMARY

[0003] The purpose of the present application is to provide a natural gas hydrogen mixing device and a natural gas hydrogen mixing system comprising the same, which can ensure that the proportion of natural gas hydrogen mixing is within a preset interval and ensure the preferential combustion of hydrogen under the working condition of hydrogen supply.

[0004] In order to achieve the above object, the application provides a natural gas hydrogen mixing device, comprising an adjusting tank, a piston, a first limiting piece, a second limiting piece, a mixing tank, a hydrogen communication mechanism, a natural gas communication mechanism and a safety valve; the adjusting tank has a containing cavity; the piston is arranged in the containing cavity and divides the containing cavity into a hydrogen chamber and a natural gas chamber, the hydrogen chamber is communicated with a first hydrogen inlet and a hydrogen outlet, and the natural gas chamber is communicated with a first natural gas inlet and a natural gas outlet; the first limiting piece is connected with the adjusting tank and located in the hydrogen chamber, the first hydrogen inlet is located between the first limiting piece and the piston, and the first hydrogen inlet is located on the side of the first limiting piece away from the piston; the second limiting piece is connected with the adjusting tank and located in the natural gas chamber, and the first natural gas inlet and the natural gas outlet are both located on the side of the second limiting piece away from the piston; the mixing tank has a mixing cavity, the mixing cavity is communicated with a second hydrogen inlet, a second natural gas inlet and a mixed gas outlet; the hydrogen communication mechanism comprises a first pipeline, and the two ends of the first pipeline are communicated with the hydrogen outlet and the second hydrogen inlet respectively; the natural gas communication mechanism comprises a second pipeline, and the two ends of the second pipeline are communicated with the natural gas outlet and the second natural gas inlet respectively; the safety valve is connected with the adjusting tank and communicated with the hydrogen chamber; wherein the piston is in sealing cooperation with the inner wall of the containing cavity and can move between the first limiting piece and the second limiting piece, when the side of the piston away from the second limiting piece contacts the first limiting piece, the piston blocks the hydrogen outlet.

[0005] The ratio of the natural gas hydrogen mixing refers to the flow rate of hydrogen / the flow rate of natural gas.

[0006] In some embodiments, the inside of the hydrogen chamber is provided with a first baffle between the first limiting piece and the first hydrogen inlet, and a hydrogen passage is formed between the first baffle and the inner wall of the hydrogen chamber.

[0007] In some embodiments, the inside of the natural gas chamber is provided with a second baffle between the first natural gas inlet and the natural gas outlet, and a natural gas passage is formed between the second baffle and the inner wall of the natural gas chamber.

[0008] In some embodiments, a third baffle is arranged in the mixing cavity, the baffle divides the mixing cavity into a first mixing chamber and a second mixing chamber, the second hydrogen inlet and the second natural gas inlet are both communicated with the first mixing chamber, the mixed gas outlet is communicated with the second mixing chamber, the third baffle is provided with a gas passing hole between the second hydrogen inlet and the second natural gas inlet, and the first mixing chamber is communicated with the second mixing chamber through the gas passing hole.

[0009] In some embodiments, the first mixing chamber is provided with a fourth baffle, the fourth baffle comprising a first blocking portion, a second blocking portion and a third blocking portion, the second blocking portion being connected to one end of the first blocking portion and located on a side of the second hydrogen inlet away from the second natural gas inlet, the third blocking portion being connected to an end of the first blocking portion away from the second blocking portion and located on a side of the second natural gas inlet away from the second hydrogen inlet, a first mixed gas passage being formed between the second blocking portion and an inner wall of the first mixing chamber, and a second mixed gas passage being formed between the third blocking portion and an inner wall of the second mixing chamber.

[0010] In some embodiments, the second mixing chamber is provided with a fifth baffle, the fifth baffle comprising a fourth blocking portion, a fifth blocking portion and a sixth blocking portion, the fifth blocking portion being connected to one end of the fourth blocking portion and located on a side of the gas passage hole, the sixth blocking portion being connected to an end of the fourth blocking portion away from the fifth blocking portion and located on a side of the gas passage hole away from the fifth blocking portion, a third mixed gas passage being formed between the fifth blocking portion and the third baffle, and a fourth mixed gas passage being formed between the sixth blocking portion and the third baffle.

[0011] In some embodiments, the hydrogen communication mechanism further comprises a first throttling member installed in the first pipeline, and the natural gas communication mechanism further comprises a second throttling member installed in the second pipeline.

[0012] In some embodiments, a linkage mechanism is further provided, the linkage mechanism being connected to the safety valve and the second limiting member respectively, and the piston being capable of moving to the preset position to press on the linkage mechanism to drive the linkage mechanism to open the safety valve.

[0013] In some embodiments, the safety valve is a lever safety valve, the second limiting member comprises a first limiting part and a second limiting part, the first limiting part is connected with the adjusting tank, the second limiting part is connected to one side of the first limiting part towards the piston, the first limiting part is provided with a receiving cavity, and the second limiting part is provided with a through hole in communication with the receiving cavity; the linkage mechanism comprises a linkage rod, a support, a lever, a pressing member and a sealing ring, the linkage rod is connected to the lever safety valve and located outside the adjusting tank, one end of the receiving cavity is open to form an opening towards the linkage rod, the support is connected to the inner wall of the receiving cavity and / or the outer wall of the adjusting tank, the lever is hinged to the support and can rotate around a first axis of the support, one end of the lever is located in the receiving cavity and the other end extends to the outside of the adjusting tank through the opening, one end of the pressing member is located in the receiving cavity and the other end passes out of the receiving cavity through the through hole, and the sealing ring is arranged between the outer wall of the pressing member and the hole wall of the through hole; wherein the piston can be moved to the preset position and pressed on the pressing member to drive the lever to rotate around the first axis through the pressing member, to drive the linkage rod to move through the lever, so as to open the lever safety valve.

[0014] The application further provides a natural gas hydrogen mixing system comprising the natural gas hydrogen mixing device, a hydrogen input mechanism, a natural gas input mechanism and a mixed gas output mechanism; the hydrogen input mechanism comprises a third pipeline and a first shut-off valve, the third pipeline is in communication with the first hydrogen inlet, and the first shut-off valve is installed on the third pipeline; the natural gas input mechanism comprises a fourth pipeline, a second shut-off valve and an adjusting valve, the fourth pipeline is in communication with the first natural gas inlet, the second shut-off valve is installed on the fourth pipeline, and the adjusting valve is installed on the fourth pipeline and located between the second shut-off valve and the adjusting tank; and the mixed gas output mechanism comprises a fifth pipeline and a third shut-off valve, the fifth pipeline is in communication with the mixed gas outlet, and the third shut-off valve is installed on the fifth pipeline.

[0015] The natural gas hydrogen mixing device has the beneficial effects that when the pressure of the natural gas chamber is greater than the pressure of the hydrogen chamber, the pressure of the natural gas chamber drives the piston to move towards the first limiting piece to compress the gas in the hydrogen chamber until the pressure in the hydrogen chamber is substantially equal to the pressure in the natural gas chamber; when the pressure in the hydrogen chamber is greater than the pressure in the natural gas chamber, the pressure in the hydrogen chamber drives the piston to move towards the second limiting piece to compress the gas in the natural gas chamber until the pressure of the natural gas chamber is substantially equal to the pressure of the hydrogen chamber, so that the pressure of the hydrogen chamber and the pressure of the natural gas chamber are substantially equal under the working condition with hydrogen supply by arranging the piston; the greater the pressure in the hydrogen chamber is, the greater the hydrogen flow delivered into the mixing cavity through the first pipeline is, and the greater the pressure in the natural gas chamber is, the greater the natural gas flow delivered into the mixing cavity through the second pipeline is, so that the ratio of natural gas hydrogen mixing is ensured to be in the preset interval and the hydrogen is ensured to be preferentially combusted when the pressure of the hydrogen chamber is in the preset range under the working condition with hydrogen supply; under the working condition without hydrogen supply, the pressure of the natural gas chamber drives the piston to move towards the first limiting piece and contact the first limiting piece, so that the piston can block the hydrogen outlet to avoid the gas in the mixing cavity from flowing back into the hydrogen chamber, and the safety is high; when the hydrogen in the hydrogen chamber is excessively supplied, the safety valve can be automatically opened to discharge the excessive hydrogen in the hydrogen chamber, so that the excessive hydrogen is prevented from flowing into the mixing cavity through the first pipeline, and the ratio of natural gas hydrogen mixing is ensured not to exceed the preset interval. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a structural diagram of a natural gas hydrogen mixing device provided by an embodiment of the present application;

[0017] Fig. 2 is a structural diagram of an adjusting tank provided by the embodiment of the present application;

[0018] Fig. 3 is a structural diagram of a mixing tank provided by the embodiment of the present application;

[0019] Fig. 4 is a structural diagram of a natural gas hydrogen mixing device provided by an embodiment of the present application;

[0020] Fig. 5 is a structural diagram of a linkage mechanism in a first state provided by the embodiment of the present application;

[0021] Fig. 6 is a structural diagram of a linkage mechanism in a second state provided by the embodiment of the present application;

[0022] Fig. 7 is a structural diagram of a natural gas hydrogen-mixed gas system provided by an embodiment of the present application.

[0023] In the figure, 1, an adjusting tank; 11, a containing cavity; 111, a hydrogen chamber; 112, a natural gas chamber; 1111, a first hydrogen inlet; 1112, a hydrogen outlet; 1113, a first baffle; 1114, a hydrogen passage; 1121, a first natural gas inlet; 1122, a natural gas outlet; 1123, a second baffle; 1124, a natural gas passage;

[0024] 2, a piston;

[0025] 3, a first limiting piece;

[0026] 4, a second limiting piece; 41, a first limiting part; 42, a second limiting part; 411, a containing cavity; 421, a through hole;

[0027] 5, a mixing tank; 51, a mixing cavity; 52, a third baffle; 53, a fourth baffle; 54, a fifth baffle; 511, a first mixing chamber; 512, a second mixing chamber; 521, a gas passing hole; 531, a first blocking part; 532, a second blocking part; 533, a third blocking part; 541, a fourth blocking part; 542, a fifth blocking part; 543, a sixth blocking part; 5111, a second hydrogen inlet; 5112, a second natural gas inlet; 5113, a third mixed gas passage; 5114, a first mixed gas passage; 5115, a second mixed gas passage; 5116, a fourth mixed gas passage; 5121, a mixed gas outlet;

[0028] 6, a hydrogen communication mechanism; 61, a first pipeline; 62, a first throttling piece;

[0029] 7, a natural gas communication mechanism; 71, a second pipeline; 72, a second throttling piece;

[0030] 8, a safety valve;

[0031] 9, a linkage mechanism; 91, a linkage rod; 92, a supporting piece; 93, a lever piece; 94, a pressing piece; 95, a sealing ring; 931, a connecting arm; 932, a power arm; 933, a resistance arm;

[0032] 100, a hydrogen input mechanism; 101, a third pipeline; 102, a first shut-off valve;

[0033] 200, a natural gas input mechanism; 201, a fourth pipeline; 202, a second shut-off valve; 203, an adjusting valve;

[0034] 300, a mixed gas output mechanism; 301, a fifth pipeline; 302, a third shut-off valve. DETAILED DESCRIPTION

[0035] The specific embodiments of the present application will be further described with reference to the drawings and examples. The following examples are intended to illustrate the present application and are not intended to limit the scope of the present application.

[0036] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and the like are merely used to facilitate the description of the present application and are not intended to limit the present application thereto.

[0037] The orientation or positional relationship indicated by "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is merely used to facilitate the description of the present application and simplify the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] The terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] Example 1

[0042] As Figs. 1-3As shown, the natural gas hydrogen mixing device preferably comprises an adjusting tank 1, a piston 2, a first limiting member 3, a second limiting member 4, a mixing tank 5, a hydrogen connecting mechanism 6, a natural gas connecting mechanism 7 and a safety valve 8. The adjusting tank 1 has a containing cavity 11. The piston 2 is arranged in the containing cavity 11 and divides the containing cavity 11 into a hydrogen chamber 111 and a natural gas chamber 112. The hydrogen chamber 111 is connected with a first hydrogen inlet 1111 and a hydrogen outlet 1112. The natural gas chamber 112 is connected with a first natural gas inlet 1121 and a natural gas outlet 1122. The first limiting member 3 is connected with the adjusting tank 1 and arranged in the hydrogen chamber 111. The first hydrogen inlet 1111 is located between the first limiting member 3 and the piston 2 and on the side of the first limiting member 3 away from the piston 2. The second limiting member 4 is connected with the adjusting tank 1 and arranged in the natural gas chamber 112. The first natural gas inlet 1121 and the natural gas outlet 1122 are both located on the side of the second limiting member 4 away from the piston 2. The mixing tank 5 has a mixing cavity 51 connected with a second hydrogen inlet 5111, a second natural gas inlet 5112 and a mixed gas outlet 5121. The hydrogen connecting mechanism 6 comprises a first pipeline 61 connected with the hydrogen outlet 1112 and the second hydrogen inlet 5111. The natural gas connecting mechanism 7 comprises a second pipeline 71 connected with the natural gas outlet 1122 and the second natural gas inlet 5112. The safety valve 8 is connected with the adjusting tank 1 and connected with the hydrogen chamber 111. The piston 2 is in sealing cooperation with the inner wall of the containing cavity 11 and can move between the first limiting member 3 and the second limiting member 4. When the side of the piston 2 away from the second limiting member 4 contacts the first limiting member 3, the piston 2 blocks the hydrogen outlet 1112.

[0043] When the pressure of the natural gas chamber 112 is greater than the pressure of the hydrogen chamber 111, the pressure of the natural gas chamber 112 drives the piston 2 to move towards the first limiting piece 3 to compress the gas in the hydrogen chamber 111 until the pressure in the hydrogen chamber 111 is substantially equal to the pressure in the natural gas chamber 112. When the pressure in the hydrogen chamber 111 is greater than the pressure in the natural gas chamber 112, the pressure in the hydrogen chamber 111 drives the piston 2 to move towards the second limiting piece 4 to compress the gas in the natural gas chamber 112 until the pressure in the natural gas chamber 112 is substantially equal to the pressure in the hydrogen chamber 111. Therefore, in the working condition with hydrogen supply, the pressure in the hydrogen chamber 111 and the pressure in the natural gas chamber 112 are substantially equal by arranging the piston 2. The greater the pressure in the hydrogen chamber 111, the greater the hydrogen flow rate delivered to the mixing cavity 51 through the first pipeline 61. The greater the pressure in the natural gas chamber 112, the greater the natural gas flow rate delivered to the mixing cavity 51 through the second pipeline 71. Since the pressure in the hydrogen chamber 111 and the pressure in the natural gas chamber 112 are substantially equal in the working condition with hydrogen supply, the hydrogen mixing ratio of the natural gas is ensured to be within the preset range when the pressure in the hydrogen chamber 111 is within the preset range, and the preferential combustion of hydrogen is ensured. In the working condition without hydrogen supply, the pressure in the natural gas chamber 112 drives the piston 2 to move towards the first limiting piece 3 and contact the first limiting piece 3, so that the piston 2 can block the hydrogen outlet 1112 to prevent the gas in the mixing cavity 51 from flowing back to the hydrogen chamber 111, and the safety is high. When the hydrogen in the hydrogen chamber 111 is excessively supplied, the safety valve 8 can be automatically opened to discharge the excessive hydrogen in the hydrogen chamber 111 to prevent the excessive hydrogen from flowing to the mixing cavity 51 through the first pipeline 61, and ensure that the hydrogen mixing ratio of the natural gas does not exceed the preset range.

[0044] The hydrogen mixing ratio of the natural gas refers to the flow rate of hydrogen / the flow rate of natural gas.

[0045] The hydrogen communication mechanism 6 comprises a first throttling piece 62 installed in the first pipeline 61. The natural gas communication mechanism 7 further comprises a second throttling piece 72 installed in the second pipeline 71. The throttling pressure of the first throttling piece 62 and the second throttling piece 72 can be used to control the hydrogen flow rate of the first pipeline 61 and the natural gas flow rate of the second pipeline 71 respectively, so as to ensure that the hydrogen mixing ratio of the natural gas is within the preset range.

[0046] In the embodiment, the first throttling piece 62 is a first throttling orifice plate, and the second throttling piece 72 is a second throttling orifice plate. By using the first throttling orifice plate or the second throttling orifice plate with different hole diameters respectively, the hydrogen flow rate of the first pipeline 61 and the natural gas flow rate of the second pipeline 71 can be controlled respectively, so as to ensure that the hydrogen mixing ratio of the natural gas is within the preset range.

[0047] In some embodiments, the first pipeline 61 is not provided with the first throttling member 62, and the second pipeline 71 is not provided with the second throttling member 72. The hydrogen flow rate of the first pipeline 61 and the hydrogen flow rate of the second pipeline 71 can be controlled by respectively adopting first and second pipelines 61 and 71 with different diameters, so as to ensure that the hydrogen mixing ratio of the natural gas is within a preset range.

[0048] The hydrogen chamber 111 is internally provided with a first baffle 1113 between the first limiting member 3 and the first hydrogen inlet 1111, and a hydrogen passage 1114 is formed between the first baffle 1113 and the inner wall of the hydrogen chamber 111. Hydrogen flows in sequence along the first hydrogen inlet 1111, the hydrogen passage 1114, and the hydrogen outlet 1112.

[0049] The first baffle 1113 can buffer the hydrogen entering the hydrogen chamber 111 from the first hydrogen inlet 1111, so as to avoid direct blowing of the hydrogen on the piston 2.

[0050] The natural gas chamber 112 is internally provided with a second baffle 1123 between the first natural gas inlet 1121 and the natural gas outlet 1122, and a natural gas passage 1124 is formed between the second baffle 1123 and the inner wall of the natural gas chamber 112.

[0051] Natural gas flows in sequence along the first natural gas inlet 1121, the natural gas passage 1124, and the natural gas outlet 1122.

[0052] The second baffle 1123 can buffer the natural gas entering the natural gas chamber 112 from the first natural gas inlet 1121, so as to avoid direct blowing of the natural gas on the piston 2.

[0053] The mixing cavity 51 is internally provided with a third baffle 52, which divides the mixing cavity 51 into a first mixing chamber 511 and a second mixing chamber 512. The second hydrogen inlet 5111 and the second natural gas inlet 5112 are both in communication with the first mixing chamber 511, the mixed gas outlet 5121 is in communication with the second mixing chamber 512, the third baffle 52 is provided with a gas passing hole 521 between the second hydrogen inlet 5111 and the second natural gas inlet 5112, and the first mixing chamber 511 is in communication with the second mixing chamber 512 through the gas passing hole 521.

[0054] The third baffle 52 is adopted to make the hydrogen and the natural gas flow to the second mixing chamber 512 through the gas passing hole 521 after being mixed in the first mixing chamber 511, which is beneficial to uniform mixing of the hydrogen and the natural gas.

[0055] In this embodiment, the gas passing hole 521 is arranged at the middle portion of the baffle.

[0056] The fourth baffle 53 is arranged in the first mixing chamber 511, and includes a first blocking part 531, a second blocking part 532 and a third blocking part 533. The second blocking part 532 is connected to one end of the first blocking part 531 and located on the side of the second hydrogen inlet 5111 away from the second natural gas inlet 5112. The third blocking part 533 is connected to the end of the first blocking part 531 away from the second blocking part 532 and located on the side of the second natural gas inlet 5112 away from the second hydrogen inlet 5111. The first mixed gas passage 5114 is formed between the second blocking part 532 and the inner wall of the first mixing chamber 511. The second mixed gas passage 5115 is formed between the third blocking part 533 and the inner wall of the second mixing chamber 512.

[0057] The hydrogen gas entering the first mixing chamber 511 through the second hydrogen inlet 5111 and the natural gas entering the first mixing chamber 511 through the second natural gas inlet 5112 are mixed in the first mixing chamber 511, and then flow to the gas passing hole 521 through the first mixed gas passage 5114 and the second mixed gas passage 5115. The first blocking part 531 can block and buffer the hydrogen gas and the natural gas entering the first mixing chamber 511, which is conducive to the uniform mixing of the hydrogen gas and the natural gas.

[0058] The fifth baffle 54 is arranged in the second mixing chamber 512, and includes a fourth blocking part 541, a fifth blocking part 542 and a sixth blocking part 543. The fifth blocking part 542 is connected to one end of the fourth blocking part 541 and located on one side of the gas passing hole 521. The sixth blocking part 543 is connected to the end of the fourth blocking part 541 away from the fifth blocking part 542 and located on the side of the gas passing hole 521 away from the fifth blocking part 542. The third mixed gas passage 5113 is formed between the fifth blocking part 542 and the third baffle 52. The fourth mixed gas passage 5116 is formed between the sixth blocking part 543 and the third baffle 52. The mixed gas entering the second mixing chamber 512 through the gas passing hole 521 flows to the mixed gas outlet 5121 through the third mixed gas passage 5113 and the fourth mixed gas passage 5116. The fourth blocking part 541 can block and buffer the mixed gas entering the second mixing chamber 512 through the gas passing hole 521, which is conducive to improving the uniformity of the mixing of the hydrogen gas and the natural gas. The fifth blocking part 542 and the sixth blocking part 543 can form a second mixed gas area with the fourth baffle, and the second mixed gas area is conducive to improving the uniformity of the mixing of the hydrogen gas and the natural gas.

[0059] Embodiment two

[0060] Reference Figs. 4-6Different from the first embodiment, the natural gas hydrogen mixing device further comprises a linkage mechanism 9 connected with the safety valve 8 and the second limiting member 4; wherein the piston 2 can be moved to the preset position to press the linkage mechanism 9 to drive the linkage mechanism 9 to open the safety valve 8. The linkage mechanism 9 can be cooperated with the piston 2 to ensure that the safety valve 8 can be smoothly opened under the working condition of excessive supply of hydrogen, and the excessive hydrogen in the hydrogen chamber 111 can be discharged, so that the proportion of hydrogen mixed in the natural gas in the mixing cavity 51 can be prevented from exceeding the preset range.

[0061] The safety valve 8 is a lever type safety valve, the second limiting member 4 comprises a first limiting part 41 and a second limiting part 42, the first limiting part 41 is connected with the adjusting tank 1, the second limiting part 42 is connected with the first limiting part 41 on the side facing the piston 2, the first limiting part 41 is provided with a containing cavity 411, and the second limiting part 42 is provided with a through hole 421 in communication with the containing cavity 411; the linkage mechanism 9 comprises a linkage rod 91, a support 92, a lever 93, a pressing member 94 and a sealing ring 95, the linkage rod 91 is connected with the lever type safety valve 8 and located outside the adjusting tank 1, one end of the containing cavity 411 facing the linkage rod 91 is open to form an opening, the support 92 is connected with the inner wall of the containing cavity 411 and / or the outer wall of the adjusting tank 1, the lever 93 is hinged with the support 92 and can rotate around the first axis of the support 92, one end of the lever 93 is located in the containing cavity 411, and the other end extends to the outside of the adjusting tank 1 through the opening, one end of the pressing member 94 is located in the containing cavity 411, and the other end passes out of the containing cavity 411 through the through hole 421, and the sealing ring 95 is arranged between the outer wall of the pressing member 94 and the hole wall of the through hole 421; wherein the piston 2 can be moved to the preset position to press the pressing member 94, so as to drive the lever 93 to rotate around the first axis through the pressing member 94, to drive the linkage rod 91 to move through the lever 93, and to open the lever type safety valve 8.

[0062] Specifically, one end of the linkage rod 91 away from the lever 93 is connected with the lever of the lever type safety valve 8, the pressing member 94 drives the linkage rod 91 to move through the lever 93, and the linkage rod 91 moves to change the lever arm of the lever of the lever type safety valve 8, so as to open the pressure relief channel of the lever type safety valve 8; when it is detected that the hydrogen chamber 111 returns to normal, the lever type safety valve 8 is manually restored.

[0063] The lever 93 comprises a connecting arm 931, a power arm 932 and a resistance arm 933, the connecting arm 931 is hinged with the support 92 and can rotate around the first axis of the support 92, the power arm 932 is connected with one end of the connecting arm 931 and extends into the containing cavity 411, and the resistance arm 933 is connected with the other end of the connecting arm 931 away from the power arm 932 and extends to the outside of the adjusting tank 1 through the opening.

[0064] The resistance arm 933 can be connected with the linkage rod 91, or not connected with the linkage rod 91.

[0065] The power arm 932 can be connected with the pressing member 94 or not connected with the pressing member 94.

[0066] Referring to Fig. 7 The application further provides a natural gas hydrogen mixing system, which comprises the natural gas hydrogen mixing device of any one of the above, and further comprises a hydrogen input mechanism 100, a natural gas input mechanism 200 and a mixed gas output mechanism 300; the hydrogen input mechanism 100 comprises a third pipeline 101 and a first shut-off valve 102, the third pipeline 101 is communicated with a first hydrogen inlet 1111, and the first shut-off valve 102 is installed on the third pipeline 101; the natural gas input mechanism 200 comprises a fourth pipeline 201, a second shut-off valve 202 and an adjusting valve 203, the fourth pipeline 201 is communicated with a first natural gas inlet 1121, the second shut-off valve 202 is installed on the fourth pipeline 201, and the adjusting valve 203 is installed on the fourth pipeline 201 and located between the second shut-off valve 202 and the adjusting tank 1; the mixed gas output mechanism 300 comprises a fifth pipeline 301 and a third shut-off valve 302, the fifth pipeline 301 is communicated with a mixed gas outlet 5121, and the third shut-off valve 302 is installed on the fifth pipeline 301.

[0067] The internal pressure of the adjusting tank 1 can be adjusted through the adjusting valve 203.

[0068] A pressure sensor is installed in the adjusting tank 1.

[0069] The existing natural gas hydrogen mixed gas system is adjusted by flow meter and regulating valve, the system is complex, flow meter blockage, flow meter power failure, regulating valve failure, regulating valve gas failure and other accidents are easy to appear, the system reliability is low, once the failure appears, the serious consequences of gas turbine damage will be caused; such as Chinese patent

public number CN212819192U

[0070] The single cost of regulating valve of gas turbine is about 200,000, and the single price of precision flow meter is about 500,000, compared with the natural gas hydrogen mixed gas system disclosed in Chinese patent

public number CN212819192U

[0071] The above is only the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled person in the art, on the premise of not departing from the technical principles of the present application, a number of improvements and substitutions can be made, these improvements and substitutions should also be regarded as the protection scope of the present application.

Claims

1. A hydrogen-mixed natural gas device, characterized by comprising: The application relates to a hydrogen-natural gas mixing device, which comprises the following parts: a regulating tank with a containing cavity; a piston arranged in the containing cavity and separating the containing cavity into a hydrogen chamber and a natural gas chamber, the hydrogen chamber being connected with a first hydrogen inlet and a hydrogen outlet, and the natural gas chamber being connected with a first natural gas inlet and a natural gas outlet; a first limiting part connected with the regulating tank and arranged in the hydrogen chamber, the first hydrogen inlet being arranged between the first limiting part and the piston, and the first hydrogen inlet being arranged on the side of the first limiting part away from the piston; a second limiting part connected with the regulating tank and arranged in the natural gas chamber, the first natural gas inlet and the natural gas outlet being arranged on the side of the second limiting part away from the piston; a mixing tank with a mixing cavity, the mixing cavity being connected with a second hydrogen inlet, a second natural gas inlet and a mixed gas outlet; a hydrogen connecting mechanism comprising a first pipeline, the two ends of the first pipeline being connected with the hydrogen outlet and the second hydrogen inlet respectively; a natural gas connecting mechanism comprising a second pipeline, the two ends of the second pipeline being connected with the natural gas outlet and the second natural gas inlet respectively; a safety valve connected with the regulating tank and connected with the hydrogen chamber; wherein the piston is in sealing cooperation with the inner wall of the containing cavity and can move between the first limiting part and the second limiting part, when the side of the piston away from the second limiting part contacts the first limiting part, the piston blocks the hydrogen outlet; a linkage mechanism connected with the safety valve and the second limiting part respectively; wherein the piston can press the linkage mechanism to drive the linkage mechanism to open the safety valve when the piston moves to a preset position.

2. The hydrogen-blended gas device of claim 1, wherein, The hydrogen chamber is internally provided with a first baffle between the first limiting part and the first hydrogen inlet, and a hydrogen passage is formed between the first baffle and the inner wall of the hydrogen chamber.

3. The hydrogen-blended gas device of claim 1, wherein, The natural gas chamber is internally provided with a second baffle between the first natural gas inlet and the natural gas outlet, and a natural gas passage is formed between the second baffle and the inner wall of the natural gas chamber.

4. The hydrogen-doped gas blending device of claim 1, wherein, The mixing cavity is internally provided with a third baffle, the third baffle separates the mixing cavity into a first mixing chamber and a second mixing chamber, the second hydrogen inlet and the second natural gas inlet are connected with the first mixing chamber, the mixed gas outlet is connected with the second mixing chamber, and the third baffle is provided with a gas passing hole between the second hydrogen inlet and the second natural gas inlet, and the first mixing chamber is connected with the second mixing chamber through the gas passing hole.

5. The hydrogen-doped natural gas mixing device according to claim 4, characterized in that, The fourth baffle is arranged in the first mixing chamber, and includes a first blocking part, a second blocking part and a third blocking part.

6. The hydrogen-doped gas blending device of claim 4, wherein, The fifth baffle is arranged in the second mixing chamber, and includes a fourth blocking part, a fifth blocking part and a sixth blocking part.

7. The hydrogen-doped gas blending device of claim 1, wherein, The hydrogen communication mechanism further comprises a first throttling part installed in the first pipeline. The natural gas communication mechanism further comprises a second throttling part installed in the second pipeline.

8. The hydrogen-doped gas blending device of claim 1, wherein, The safety valve is a lever type safety valve, the second limiting part includes a first limiting part and a second limiting part, the first limiting part is connected with the adjusting tank, the second limiting part is connected to one side of the first limiting part facing the piston, the first limiting part is provided with a receiving cavity, and the second limiting part is provided with a through hole in communication with the receiving cavity. The linkage mechanism includes a linkage rod, a support, a lever, a pressing part and a sealing ring, the linkage rod is connected with the lever type safety valve and located outside the adjusting tank, one end of the receiving cavity facing the linkage rod is open to form an opening, the support is connected with the inner wall of the receiving cavity and / or the outer wall of the adjusting tank, the lever is hinged with the support and can rotate around a first axis of the support, one end of the lever is located in the receiving cavity, and the other end extends to the outside of the adjusting tank through the opening, one end of the pressing part is located in the receiving cavity, and the other end penetrates out of the receiving cavity through the through hole, and the sealing ring is arranged between the outer wall of the pressing part and the hole wall of the through hole. The piston can move to the preset position and press the pressing part, so as to drive the lever to rotate around the first axis through the pressing part, drive the linkage rod to move through the lever, and open the lever type safety valve.

9. A hydrogen-mixed natural gas system, characterized by comprising: The natural gas hydrogen mixing device comprises a hydrogen input mechanism, a natural gas input mechanism and a mixed gas output mechanism. The hydrogen input mechanism comprises a third pipeline and a first shut-off valve, the third pipeline is in communication with the first hydrogen inlet, and the first shut-off valve is installed in the third pipeline. The natural gas input mechanism comprises a fourth pipeline, a second shut-off valve and a regulating valve, the fourth pipeline is communicated with the first natural gas inlet, the second shut-off valve is installed on the fourth pipeline, and the regulating valve is installed on the fourth pipeline and located between the second shut-off valve and the regulating tank. The mixed gas output mechanism comprises a fifth pipeline and a third shut-off valve, the fifth pipeline is communicated with the mixed gas outlet, and the third shut-off valve is installed on the fifth pipeline.

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