CN116658298A - Liquid oxygen and liquid methane comprehensive utilization system and method - Google Patents

Abstract

The invention discloses a liquid oxygen and liquid methane comprehensive utilization system which comprises a liquid oxygen component, a liquid methane component, a combustion energy component, a second heat exchanger, an oxygen storage tank component, a methane storage tank component and a CO2 storage tank component, wherein the inlet end of the combustion energy component is connected with the liquid oxygen component and the liquid methane component; CO2 generated after the liquid oxygen and the liquid methane are mixed and combusted in the combustion energy assembly is input into the inlet end of the second heat exchanger through a pipeline, the liquid oxygen assembly and the liquid methane assembly are further connected with the inlet end of the second heat exchanger respectively, and the outlet end of the second heat exchanger is connected with the oxygen storage tank assembly, the methane storage tank assembly and the liquid CO2 storage tank assembly respectively. The invention also discloses a method for adopting the liquid oxygen and liquid methane comprehensive utilization system. The invention has the beneficial effects that: carbon trapping and zero emission are realized; the system has various products, high comprehensive utilization rate and good economic benefit.

Description

Liquid oxygen and liquid methane comprehensive utilization system and method

Technical Field

The invention relates to energy utilization, in particular to comprehensive utilization of liquid oxygen and liquid methane.

Background

The development of clean energy, the improvement of the energy utilization rate and the realization of the separation and the trapping of carbon dioxide generated by combustion are important ways of industrial emission reduction. In the energy structure transformation and upgrading, the methane capture and high-efficiency utilization are promoted, so that the emission reduction effect is improved, and the emission reduction pressure is reduced. Methane is global second greenhouse gas, methane is promoted to be used, zero emission of methane is promoted, comprehensive utilization efficiency of methane is improved, high-end, diversified and low-carbonization development of a methane industry chain is promoted, and the method is a powerful means for realizing green development in the energy industry.

Methane is regarded as the cleanest fossil energy source on the earth, has excellent characteristics in various aspects such as cost, safety and the like, and has remarkable effects in the aspects such as aerospace, power generation, heat supply, chemical industry and the like. It is colorless, odorless, nontoxic and noncorrosive, and has no pollution to air after combustion, and the heat emitted is large, so that the energy is a relatively advanced green energy source. The oxygen-enriched combustion device is matched with liquid oxygen for use, realizes oxygen-enriched combustion, and can be used for space engines, gas turbine power generation, large-scale heating devices and the like. The final products are water and carbon dioxide, and the environment is not polluted. Such as bulletin number: CN116025485a, an electric pump-based carrier rocket attitude control power system and a use method thereof, wherein the liquid oxygen electric pump module extracts liquid oxygen from a liquid oxygen main conveying pipe; the liquid oxygen is supplied to the liquid oxygen methane attitude control engine unit through a liquid oxygen conveying pipeline, then the circulating cooling flow is controlled through a liquid oxygen one-way flow regulating valve, and finally the liquid oxygen is returned to the liquid oxygen storage tank. The fuel electric pump module pumps fuel from the liquid methane main conveying pipe; the fuel is supplied to the liquid oxygen methane attitude control engine unit through a fuel conveying pipeline, the circulating cooling flow is controlled through a fuel one-way flow regulating valve, and finally the liquid oxygen methane is returned to the liquid methane storage tank. The method is suitable for the primary, secondary and upper stages of the reusable liquid oxygen/methane carrier rocket, and is also suitable for new generation carrier rockets adopting liquid oxygen/kerosene or liquid oxygen/liquid hydrogen propellant. The method comprises the following steps: CN115853668A, a liquid oxygen methane engine and its multiple ignition method, the gas generator and the thrust chamber are both connected with the fuel pump and the oxygen pump, and are used for pumping fuel and liquid oxygen.

At present, the mixed combustion of liquid oxygen and liquid methane is mainly used as an engine, power generation and the like, CO2 after combustion is not treated, and separation and trapping of CO2 after methane combustion are achieved.

Moreover, liquid oxygen and liquid methane not only can be combusted as kinetic energy, but also have other applications, and are not fully utilized at present.

Therefore, a comprehensive utilization system for liquid oxygen and liquid methane is urgently needed.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information has been made as prior art that is well known to a person of ordinary skill in the art.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: how to solve the problems of the prior liquid oxygen liquid methane and realizing full utilization.

The invention solves the technical problems by the following technical means:

the liquid oxygen and liquid methane comprehensive utilization system comprises a liquid oxygen component, a liquid methane component, a combustion energy component, a second heat exchanger, an oxygen storage tank component, a methane gas storage tank component and a liquid CO2 storage tank component, wherein the inlet end of the combustion energy component is connected with the liquid oxygen component and the liquid methane component; CO2 generated after the mixed combustion of liquid oxygen and liquid methane in the combustion energy assembly is sequentially input into the inlet ends of the first heat exchanger and the second heat exchanger through pipelines, the liquid oxygen assembly and the liquid methane assembly are respectively connected with the inlet ends of the second heat exchanger, and the outlet ends of the second heat exchanger are respectively connected with the oxygen storage tank assembly, the methane gas storage tank assembly and the liquid CO2 storage tank assembly.

In the invention, the combustion energy component is a component capable of realizing and utilizing the combustion of liquid oxygen and liquid methane, and the energy generated by the combustion of the liquid oxygen and the liquid methane can be used for providing power, generating electricity, heating and the like; meanwhile, the other way, the liquid oxygen, the liquid methane and the CO2 after combustion exchange heat in a second heat exchanger to respectively obtain normal-temperature high-pressure oxygen, normal-temperature high-pressure methane gas and low-temperature high-pressure CO2 gas, and the low-temperature high-pressure CO2 gas is stored in a liquid CO2 storage tank assembly after being liquefied; the oxygen produced by the system can be used as medical, respiratory or chemical raw materials, methane gas can be used as fuel or chemical raw materials, liquid CO2 can be used as fire-fighting and fire-extinguishing, dry ice preparation, secondary refrigerant, chemical raw materials and the like, and the liquid CO2 can be evaporated to obtain 99.999% of high-purity CO2. Therefore, in the comprehensive utilization system, oxygen-enriched combustion is realized by liquid oxygen and liquid methane, and CO2 liquid is obtained after the product CO2 is subjected to twice heat exchange and liquefaction, so that carbon trapping and zero emission are realized; the system has a variety of outputs: the electric power, oxygen, methane gas, CO2 liquid, high-purity gas, heat and cold energy are high in comprehensive utilization rate and good in economic benefit; the products are all clean products, which is beneficial to environmental protection.

Preferably, the outlet end of the liquid oxygen component is connected with the combustion energy component through a first pump valve component, the first pump valve component comprises a liquid oxygen booster pump, the outlet end of the liquid oxygen booster pump is divided into two paths, the first path is connected with the combustion energy component, the second path is connected with the second heat exchanger, and the first path and the second path are respectively connected with a liquid oxygen liquid outlet valve.

Preferably, the liquid oxygen component comprises a liquid oxygen tank, a liquid oxygen filling pipe and a liquid oxygen safety pipe, wherein the liquid oxygen filling pipe and the liquid oxygen safety pipe are respectively connected with the liquid oxygen tank.

Preferably, the outlet end of the liquid methane assembly is connected with the combustion energy assembly through a second pump valve assembly, the second pump valve assembly comprises a liquid methane booster pump, the outlet end of the liquid methane booster pump is divided into two paths, the first path is connected with the combustion energy assembly, the second path is connected with the second heat exchanger, and the first path and the second path are respectively connected with liquid methane outlet valves.

The booster pump is adopted to realize medium high-pressure transmission, is easy to operate and high in efficiency, avoids the use of multiple sets of compressors such as storage tank pressurization, normal-temperature gas compression and the like, and reduces the complexity of the system. The liquid methane and the liquid oxygen are supplied in a high-pressure state, so that the use of a gas compressor at the upstream of the gas turbine is avoided, and the complexity of the gas turbine is reduced.

Preferably, the liquid methane component comprises a liquid methane tank, a liquid methane filling pipe and a liquid methane safety pipe, wherein the liquid methane filling pipe and the liquid methane safety pipe are respectively connected with the liquid methane tank.

Preferably, the combustion energy component is one of a gas turbine, a boiler and an engine, and when the combustion energy component is the gas turbine, the gas turbine is connected with a generator.

Various capacity utilization may be achieved.

Preferably, the device further comprises a first heat exchanger and a condensed water storage tank, wherein CO2 is sequentially input into the first heat exchanger and the second heat exchanger from the outlet end of the combustion energy assembly, and the first heat exchanger is connected with the condensed water storage tank.

The first heat exchanger exchanges heat with an external medium, residual heat is transferred to the external medium such as water, air and the like, so that waste heat is further utilized, the combusted CO2 is subjected to heat exchange by the first heat exchanger to obtain normal-temperature high-pressure CO2, meanwhile, condensed water is separated and stored in the condensed water storage tank, and the condensed water can be directly used as industrial water or can be treated to be used as domestic water.

Preferably, the oxygen storage tank assembly comprises an oxygen storage tank and an oxygen valve, wherein the inlet end of the oxygen storage tank is connected with the second heat exchanger, and the oxygen valve is connected with the outlet end of the oxygen storage tank; the methane gas storage tank assembly comprises a methane gas storage tank and a methane gas valve, wherein the inlet end of the methane gas storage tank is connected with the second heat exchanger, and the methane gas valve is connected with the outlet end of the methane gas tank; the liquid CO2 storage tank assembly comprises a liquid CO2 storage tank and a liquid CO2 valve, wherein the inlet end of the liquid CO2 storage tank is connected with the second heat exchanger, and the liquid CO2 valve is connected with the outlet end of the liquid CO2 storage tank.

Preferably, the liquid CO2 storage tank assembly further comprises an evaporation device, and the outlet end of the liquid CO2 storage tank assembly is connected with the evaporation device.

The invention also discloses a method for mining the liquid oxygen and liquid methane comprehensive utilization system, which comprises the following steps:

s1: filling liquid oxygen into the liquid oxygen component and filling liquid methane into the liquid methane component;

s2: controlling the liquid oxygen component and the liquid methane component to simultaneously respectively transmit liquid oxygen and liquid methane to the combustion energy component, and generating kinetic energy and utilizing the kinetic energy after the liquid oxygen and the liquid methane are mixed and combusted by the combustion energy component;

s3: CO2 generated after combustion is input into the first heat exchanger through a pipeline for heat exchange and then enters the second heat exchanger, the liquid oxygen component and the liquid methane component are also respectively input into the second heat exchanger for heat exchange, so that normal-temperature high-pressure oxygen, normal-temperature high-pressure methane gas and low-temperature high-pressure CO2 gas are obtained, the normal-temperature high-pressure oxygen is stored in the oxygen storage tank component, the normal-temperature high-pressure methane gas is stored in the methane storage tank component, and the low-temperature high-pressure CO2 gas is stored in the liquid CO2 storage tank component through liquefaction.

The invention has the advantages that:

(1) In the invention, the combustion energy component is a component capable of realizing and utilizing the combustion of liquid oxygen and liquid methane, and the energy generated by the combustion of the liquid oxygen and the liquid methane can be used for providing power, generating electricity, heating and the like; meanwhile, the other way, the liquid oxygen, the liquid methane and the CO2 after combustion exchange heat in a second heat exchanger to respectively obtain normal-temperature high-pressure oxygen, normal-temperature high-pressure methane gas and low-temperature high-pressure CO2 gas, and the low-temperature high-pressure CO2 gas is stored in a liquid CO2 storage tank assembly after being liquefied; the oxygen produced by the system can be used as medical, respiratory or chemical raw materials, methane gas can be used as fuel or chemical raw materials, liquid CO2 can be used as fire-fighting and fire-extinguishing, dry ice preparation, secondary refrigerant, chemical raw materials and the like, and the liquid CO2 can be evaporated to obtain 99.999% of high-purity CO2. Therefore, in the comprehensive utilization system, oxygen-enriched combustion is realized by liquid oxygen and liquid methane, and CO2 liquid is obtained after the product CO2 is subjected to twice heat exchange and liquefaction, so that carbon trapping and zero emission are realized; the system has a variety of outputs: the electric power, oxygen, methane gas, CO2 liquid, high-purity gas, heat and cold energy are high in comprehensive utilization rate and good in economic benefit; the products are all clean products, which is beneficial to environmental protection;

(2) The booster pump is adopted to realize medium high-pressure transmission, is easy to operate and high in efficiency, avoids the use of multiple sets of compressors such as storage tank pressurization, normal-temperature gas compression and the like, and reduces the complexity of the system. The liquid methane and the liquid oxygen are supplied in a high-pressure state, so that the use of a gas compressor at the upstream of the gas turbine is avoided, and the complexity of the gas turbine is reduced;

(3) The combustion energy component is one of a gas turbine, a boiler and an engine, and when the combustion energy component is the gas turbine, the gas turbine is connected with the generator; multiple capacity utilization can be achieved;

(4) The first heat exchanger exchanges heat with an external medium, residual heat is transferred to the external medium such as water, air and the like, so that waste heat is further utilized, the combusted CO2 is subjected to heat exchange in the first heat exchanger to obtain normal-temperature high-pressure CO2, meanwhile, condensed water is separated and stored in a condensed water storage tank, and the condensed water can be directly used as industrial water or can be treated to be used as domestic water;

(5) The liquid methane is fuel, has the characteristics of low density, high heat value, no pollution of products, low price, high coking limit temperature, low viscosity and the like, is a green high energy storage source, has small storage space and high storage capacity and has higher low-temperature storage safety compared with methane gas; liquid oxygen is adopted as combustion-supporting material, so that the oxygen supply purity is high, and oxygen-enriched combustion can be realized; the products are all clean products, which is beneficial to environmental protection;

(6) In the field of interplanetary exploration, it is contemplated that methane, oxygen, are present in large quantities on many stars (e.g., soil guard 6), or may be prepared in large quantities, stored in liquid-oxygen-liquid methane form for return to earth, and may be used in generators or other life support systems on the interplanetary base. In short, the direct utilization of various energy resources in space will be a new model for future space development. Therefore, the invention is particularly suitable for being used in energy independent areas such as large ships, rocket launching or testing sites, future interstellar bases and the like, and can realize independent supply of electricity, gas, heat and cold.

(7) The invention can also be used in factories, power plants and other occasions, increases system products, and improves comprehensive utilization rate and economic benefit. The invention has wide application.

Drawings

FIG. 1 is a schematic diagram of a system for comprehensively utilizing liquid oxygen and liquid methane in a first and a second embodiment of the invention;

FIG. 2 is a schematic diagram of a system for comprehensively utilizing liquid oxygen and liquid methane in a third embodiment of the present invention;

reference numerals in the drawings:

10. a liquid oxygen component; 11. a liquid oxygen tank; 12. a liquid oxygen filling joint; 13. filling the filter with liquid oxygen; 14. a liquid oxygen filling valve; 15. a liquid oxygen storage tank pressure release valve; 16. a liquid oxygen storage tank safety valve;

20. a liquid methane assembly; 21. a liquid methane tank; 22. filling the joint with liquid methane; 23. filling the liquid methane into a filter; 24. a liquid methane filling valve; 25. a liquid methane storage tank pressure release valve; 26. a liquid methane storage tank safety valve; 27. a flame arrester;

30. a combustion energy assembly; 31. a gas turbine; 32. a generator;

40. a first heat exchanger;

50. a second heat exchanger;

60. an oxygen storage tank assembly; 61. an oxygen storage tank; 62. an oxygen valve;

70. a methane gas storage tank assembly; 71. a methane gas storage tank; 72. a methane gas valve;

80. a CO2 storage tank assembly; 81. a liquid CO2 storage tank; 82. a liquid CO2 valve; 83. a throttle valve; 84. an evaporation device; 85. a CO2 liquid outlet valve; 86. a CO2 gas outlet valve;

90. a first pump valve assembly; 91. a liquid oxygen total liquid outlet valve; 92. a liquid oxygen booster pump; 93. a first liquid oxygen outlet valve; 94. a second liquid oxygen outlet valve;

100. a second pump valve assembly; 101. a liquid methane total liquid outlet valve; 102. a liquid methane booster pump; 103. a first liquid methane outlet valve; 104. and a second liquid methane liquid outlet valve.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Embodiment one:

as shown in fig. 1, the liquid oxygen and liquid methane comprehensive utilization system comprises a liquid oxygen assembly 10, a liquid methane assembly 20, a combustion energy assembly 30, a first heat exchanger 40, a second heat exchanger 50, an oxygen storage tank assembly 60, a methane storage tank assembly 70 and a liquid CO2 storage tank assembly 80, wherein the inlet ends of the combustion energy assembly 30 are connected with the liquid oxygen assembly 10 and the liquid methane assembly 20; CO2 generated after the liquid oxygen and the liquid methane are mixed and combusted in the combustion energy assembly 30 is sequentially input into the first heat exchanger 40 and the second heat exchanger 50 through pipelines, the liquid oxygen assembly 10 and the liquid methane assembly 20 are respectively connected with the inlet end of the second heat exchanger 50, and the outlet end of the second heat exchanger 50 is respectively connected with the oxygen storage tank assembly 60, the methane storage tank assembly 70 and the liquid CO2 storage tank assembly 80.

Specifically, the liquid oxygen assembly 10 includes a liquid oxygen tank 11, a liquid oxygen filling pipe, and a liquid oxygen safety pipe, wherein the liquid oxygen filling pipe and the liquid oxygen safety pipe are respectively connected with the liquid oxygen tank 11. A liquid oxygen filling joint 12 is connected to the end of the liquid oxygen filling pipe for being connected with an external cryogenic tank car to realize filling of liquid oxygen. The liquid oxygen filling pipe is also connected with a liquid oxygen filling filter 13 and a liquid oxygen filling valve 14, the liquid oxygen filling filter 13 prevents particulate impurities from entering the liquid oxygen storage tank, the situation that liquid oxygen and other particulate impurities are rubbed to cause flash explosion and the like is avoided, and the liquid oxygen filling valve 14 controls a filling switch. The liquid oxygen installation pipe is provided with a liquid oxygen storage tank pressure relief valve 15 and a liquid oxygen storage tank safety valve 16, the liquid oxygen storage tank pressure relief valve 15 can ensure that the liquid oxygen tank 11 is safe and does not have overpressure, and the liquid oxygen storage tank pressure relief valve 16 is used for automatically relieving the overpressure condition of the liquid oxygen tank 11. In addition, a pressure measuring device is further arranged on the liquid oxygen tank 11 and is used for measuring the internal pressure of the liquid oxygen tank 11, and when the pressure P1 of the liquid oxygen tank 11 is higher than a safety value, the liquid oxygen tank pressure relief valve 15 is opened to ensure that the liquid oxygen tank is safe and does not have overpressure.

When the liquid oxygen tank 11 is filled, the liquid oxygen filling valve 14 is opened, the cryogenic tank car is filled with liquid oxygen into the liquid oxygen tank 11 through the liquid oxygen filling joint 12, the liquid oxygen storage tank pressure relief valve 15 is opened, cold cryogenic oxygen is emptied, after the filling is finished, the liquid oxygen filling valve 14 is closed, and the liquid oxygen storage tank pressure relief valve 15 is closed.

The liquid methane assembly 20 comprises a liquid methane tank 21, a liquid methane filling pipe and a liquid methane safety pipe, wherein the liquid methane filling pipe and the liquid methane safety pipe are respectively connected with the liquid methane tank 21. A liquid methane filling joint 22 is connected to the end of the liquid methane filling pipe for connection with an external cryogenic tank car to effect flushing of liquid methane. The liquid methane filling filter 23 and the liquid methane filling valve 24 are also connected to the liquid methane filling pipe, and the liquid methane filling filter 23 prevents particulate impurities from entering the liquid methane storage tank, so that the conditions of flash explosion and the like caused by friction between the liquid methane and other particulate impurities are avoided. The liquid methane installation pipe is provided with a liquid methane storage tank pressure relief valve 25 and a liquid methane storage tank safety valve 26, the liquid methane storage tank pressure relief valve 25 ensures that the liquid methane tank 21 is safe and does not have overpressure, and the liquid methane storage tank safety valve 26 is used for automatically relieving the overpressure condition of the liquid methane tank 21. In addition, a pressure measuring device is further arranged on the liquid methane tank 21 and used for measuring the internal pressure of the liquid methane tank 21, and when the pressure P4 of the liquid methane tank 21 is higher than a safety value, the pressure relief valve 25 of the liquid methane tank is opened, so that the safety of the liquid methane tank is ensured. The fire arrestor 27 is arranged at the tail end of the emptying pipeline of the liquid methane tank 21, so that external flame is prevented from entering, and the safety of the system is ensured.

When the liquid methane tank 21 is filled, the liquid methane filling valve 24 is opened, liquid methane is filled into the liquid methane tank 21 through the liquid methane filling joint 22, the liquid methane tank pressure relief valve 25 is opened, cold low-temperature oxygen is emptied, after the filling is finished, the liquid methane filling valve 24 is closed, and the liquid methane tank pressure relief valve 25 is closed.

In this embodiment, the liquid oxygen component 10 and the liquid methane component 20 are connected to the combustion energy component 30 through one path, and are synchronous, and the liquid oxygen component 10 and the liquid methane component 20 are also connected to the second heat exchanger 50 through the other path.

Specifically, the outlet end of the liquid oxygen tank 11 is connected to the combustion energy assembly 30 via a first pump valve assembly 90. The first pump valve assembly 90 includes a total liquid oxygen outlet valve 91, a liquid oxygen booster pump 92, a first liquid oxygen outlet valve 93, and a second liquid oxygen outlet valve 94. The pipeline between the liquid oxygen tank 11 and the combustion energy assembly 30 is a Y-shaped pipeline, the liquid outlet end of the liquid oxygen booster pump 92 is divided into two parts, the liquid oxygen total liquid outlet valve 91 is positioned between the liquid oxygen booster pump 92 and the liquid oxygen tank 11, a first path of the liquid oxygen booster pump 92 is connected with the combustion energy assembly 30, a first liquid oxygen liquid outlet valve 93 is connected on the first liquid oxygen pipeline, a second liquid oxygen pipeline is connected with the second heat exchanger 50, and a second liquid oxygen liquid outlet valve 94 is connected on the first liquid oxygen pipeline. And a pressure measuring device is arranged at the liquid outlet end of the liquid oxygen booster pump 92 to measure the pressure P2 after the liquid oxygen is boosted. The first liquid oxygen pipeline is also provided with a flow measuring device for measuring the flow F1 on the first liquid oxygen pipeline. And a flow measuring device is further arranged on the second liquid oxygen pipeline and used for measuring the flow F2 on the second liquid oxygen pipeline.

The outlet end of the liquid methane tank 21 is connected to the combustion energy assembly 30 by a second pump valve assembly 100. The second pump valve assembly 100 comprises a liquid methane total liquid outlet valve 101, a liquid methane booster pump 102, a first liquid methane liquid outlet valve 103 and a second liquid methane liquid outlet valve 104. The pipeline between liquid methane tank 21 and the combustion energy assembly 30 is a Y-shaped pipeline, the liquid outlet end of liquid methane booster pump 102 is divided into two parts, liquid methane total liquid outlet valve 101 is positioned between liquid methane booster pump 102 and liquid methane tank 21, the first outlet path of liquid methane booster pump 102 is connected with combustion energy assembly 30, the first liquid methane pipeline is connected with first liquid methane liquid outlet valve 103, the second liquid methane pipeline is connected with second heat exchanger 50, and the first liquid methane pipeline is connected with second liquid methane liquid outlet valve 104. And a pressure measuring device is arranged at the liquid outlet end of the liquid methane booster pump 102 to measure the pressure P5 of the liquid methane after being boosted. And a flow measuring device is further arranged on the first liquid methane pipeline, and the flow F3 on the first liquid methane pipeline is measured. And a flow measuring device is further arranged on the second liquid methane pipeline and used for measuring the flow F4 on the second liquid methane pipeline.

The liquid oxygen tank 11 and the liquid methane tank 21 are low-temperature storage tanks, liquid oxygen and liquid methane are stored in special low-temperature storage tanks, and the liquid oxygen tank and the liquid methane tank have high storage density, small space occupation, high transfer, filling and transmission efficiency and high cost performance in the occasion of transporting large-flow media.

In operation, the liquid oxygen total outlet valve 91 is opened, the liquid oxygen booster pump 92 is started to deliver liquid oxygen to the downstream, the outlet pressure P2 of the liquid oxygen booster pump 92 can be detected, and the liquid oxygen flow F1 flowing to the combustion energy assembly 30 is controlled by adjusting the opening degree of the first liquid oxygen outlet valve 93. The liquid methane total liquid outlet valve 101 is opened, the liquid methane booster pump 102 is started, liquid methane is conveyed to the downstream, the outlet pressure P5 of the liquid methane booster pump 102 can be detected, and the liquid methane flow rate F3 flowing to the combustion energy assembly 30 is controlled by adjusting the opening degree of the first liquid methane liquid outlet valve 103. The liquid oxygen and the liquid oxygen methane are mixed and combusted in the combustion energy assembly 30 according to a certain proportion to generate high-temperature and high-pressure mixed working medium of water and CO2.

In synchronization, the liquid oxygen booster pump 92 is started to deliver liquid oxygen downstream, and the liquid oxygen flow rate F2 flowing to the second heat exchanger 50 is controlled by adjusting the opening degree of the second liquid oxygen outlet valve 94. The liquid methane flow rate F4 to the second heat exchanger 50 is controlled by adjusting the opening of the second liquid methane outlet valve 104.

In the present embodiment, the combustion energy assembly 30 includes a gas turbine 31 and a generator 32, the gas turbine 31 providing a power output for the generator 32.

The liquid oxygen and the liquid methane both adopt the booster pump to realize medium high-pressure transmission, and compared with a mode of gas pressurization in a storage tank, the booster pump has the characteristics of convenience, high efficiency, high pressurization pressure, large flow, no external air source and the like, can realize rapid large-flow liquid outlet, is easy to operate and high in efficiency, simultaneously avoids the use of multiple sets of compressors such as pressurization of the liquid oxygen tank 11 and the liquid methane tank 21, normal-temperature gas compression and the like, and reduces the complexity of the system. The supply of liquid methane and liquid oxygen at high pressure avoids the use of a gas compressor upstream of the gas turbine 31 and reduces the complexity of the gas turbine 31.

The exhaust steam of the gas turbine 31 comprises high-temperature and high-pressure CO2 and steam, and the exhaust steam exchanges heat with an external medium through the first heat exchanger 40, and transfers the residual heat to the external medium such as water, air and the like, so that the residual heat is further utilized, and the CO2 with normal temperature and high pressure is output. A temperature measuring device is arranged on the output pipeline of the first heat exchanger 40 and is used for measuring the temperature T3 in the outlet of the first heat exchanger 40. While the separated condensed water is stored in the condensed water storage tank 110. The condensed water can be directly used as industrial water or treated to be used as domestic water. After 1 ton of methane is combusted, 2.25 tons of condensed water can be produced, and the condensed water recycling method has important significance in the shortage of fresh water resources such as ships and the like.

The gas turbine 31 mixes and combusts liquid oxygen and liquid methane to generate high-temperature and high-pressure water and CO2 for expansion power generation. Compared with the possible oxygen which is insufficient in the compressed air or low in oxygen purity, so that toxic pollutants such as CO and NOX are produced, the liquid oxygen and the liquid methane are mixed for combustion, so that the oxygen-enriched combustion is realized, the combustion intensity is improved, the combustion speed is accelerated, carbon deposition is avoided, the combustion reaction is complete, and the capture of CO2 is facilitated by reducing the combustion pollutants.

From the above, it is known that: the liquid oxygen tank 11 is connected with the second heat exchanger 50 through a second liquid oxygen pipeline, the liquid methane tank 21 is connected with the second heat exchanger 50 through a second liquid methane pipeline, and CO2 gas liquid after passing through the first heat exchanger 40 enters the second heat exchanger 50. The second heat exchanger 50 is a three-medium heat exchanger, and the liquid oxygen, the liquid methane and the normal-temperature high-pressure CO2 exchange heat in the three-medium heat exchanger to respectively obtain normal-temperature high-pressure oxygen, normal-temperature high-pressure methane gas and low-temperature high-pressure CO2 gas.

The oxygen storage tank assembly 60 comprises an oxygen storage tank 61 and an oxygen valve 62, wherein the inlet end of the oxygen storage tank 61 is connected with the second heat exchanger 50, and the oxygen valve 62 is connected with the outlet end of the oxygen storage tank 61; a temperature measuring device is provided at the inlet end of the oxygen storage tank 61 to measure the temperature T1 of the oxygen flowing out of the second heat exchanger 50. The oxygen storage tank 61 is provided with a pressure measuring device, and the pressure of the oxygen storage tank 61 is measured to be P3. The oxygen produced by the system can be used as medical, respiratory or chemical raw materials.

The methane gas storage tank assembly 70 comprises a methane gas storage tank 71 and a methane gas valve 72, wherein the inlet end of the methane gas storage tank 71 is connected with the second heat exchanger 50, and the methane gas valve 72 is connected with the outlet end of the methane gas tank 71; a temperature measuring device is provided at the inlet end of the methane gas storage tank 71 to measure the methane temperature T2 flowing out of the second heat exchanger 50. The methane gas tank 71 is provided with a pressure measuring device, and the pressure of the methane gas tank 71 is measured as P6. Methane gas can be used as fuel or chemical raw material.

The liquid CO2 storage tank assembly 80 includes a liquid CO2 storage tank 81, a liquid CO2 valve 82, a throttle valve 83, an evaporation device 84, and a CO2 liquid outlet valve 85, wherein an inlet end of the liquid CO2 storage tank 81 is connected to the second heat exchanger 50, and the liquid CO2 valve 82 is connected to an outlet end of the liquid CO2 storage tank 81. The second heat exchanger 50 is connected with the liquid CO2 storage tank 81 through a straight pipe, that is, the liquid CO2 generated after the heat exchange of the second heat exchanger 50 can directly flow to the liquid CO2 storage tank 81; the second heat exchanger 50 is also connected with a liquid CO2 storage tank 81 through a liquefaction pipeline, and the low-temperature high-pressure CO2 gas subjected to heat exchange by the second heat exchanger 50 passes through a throttle valve 83 to obtain CO2 liquid, and the CO2 liquid is stored in the liquid CO2 storage tank 81. Liquid CO2 may be supplied directly downstream by opening the liquid CO2 valve 82. High purity CO2 gas of 99.999% can also be obtained by evaporation means 84. A temperature measuring device is provided behind the throttle valve 83 to measure the liquid CO2 temperature T4 behind the throttle valve 83. The liquid CO2 tank 81 is provided with a pressure measuring device, and the pressure of the liquid CO2 tank 81 is measured to be P7. The liquid CO2 can be used as fire extinguishing, dry ice preparation, secondary refrigerant, chemical raw materials and the like, and the high-purity CO2 gas obtained by evaporating the liquid CO2 can be used for producing, welding protective gas and the like. Carbon dioxide, which is one of the constituent components of the atmosphere, does not destroy the ozone layer, and has an ODP (ozone depletion potential) of 0. Carbon dioxide is a greenhouse gas, but the greenhouse effect is far lower than other synthetic refrigerants. Carbon dioxide is an industrial byproduct and can be used as a refrigerant, which corresponds to waste recycling.

The opening degree of the second liquid oxygen outlet valve 94 is adjusted to control the liquid oxygen flow rate F2 flowing to the second heat exchanger 50, and the opening degree of the second liquid methane outlet valve 104 is adjusted to control the liquid methane flow rate F4 flowing to the second heat exchanger 50, so that the temperature T4 of the throttled CO2 is ensured to be normal temperature and the CO2 in the liquid CO2 storage tank 81 is ensured to be in a liquid state. While ensuring that the oxygen outlet temperature T1 of the second heat exchanger 50 and the methane outlet temperature T2 of the second heat exchanger 50 are at normal temperature.

In this embodiment, the liquid oxygen and the liquid methane realize oxygen-enriched combustion, the heat of the CO2 after combustion is higher, and the waste heat can be utilized for heating for the first time through the heat exchange between the first heat exchanger 40 and the outside. Meanwhile, the normal-temperature CO2 (with a plurality of oxygen) separated by the first heat exchanger 40 has a certain pressure, and is changed into low-temperature high-pressure gas with liquid oxygen and liquid methane after heat exchange by the second heat exchanger 50, meanwhile, residual moisture is removed to obtain high-purity gas, then liquid CO2 is obtained through throttling expansion and is stored in a storage tank, CO2 trapping and zero emission are realized, meanwhile, the high-pressure liquid oxygen and liquid methane are changed into high-pressure normal-temperature high-purity gas after heat exchange, and the high-pressure gas can be directly filled into a steel cylinder and is stored in the storage tank, so that the use of a compressor is avoided.

The system has a variety of outputs: the electric power, oxygen, methane gas, CO2 liquid, CO2 high-purity gas, heat and cold energy are high in comprehensive utilization rate and good in economic benefit; the products are all clean products, which is beneficial to environmental protection.

Embodiment two:

in this embodiment, the combustion energy assembly 30 is a boiler of a large heating system, and can burn to generate heat to realize heating.

It should be noted that: the combustion energy assembly 30 is an assembly capable of realizing the combustion and utilization of liquid oxygen and liquid methane, and may be a combination of the gas turbine 31 and the generator 32 in the first embodiment, a boiler of a large heating device in the present embodiment, a large engine, or a power output for a transfer member. Any existing or future power machine that can utilize the energy generated by the combustion of liquid oxygen and liquid methane can be used to provide power, generate electricity, heat, etc., thereby realizing various energy utilization.

Embodiment III:

as shown in fig. 2, the present embodiment is different from the first embodiment in that: the liquefaction of the liquid CO2 in the liquid CO2 storage tank 81 can be performed by the second heat exchanger 50 without the need for the evaporation device 84.

Specifically, when the gasification treatment is required for the liquid CO2 in the liquid CO2 storage tank 81, the CO2 outlet valve 85 is opened, and the liquid CO2 is reconnected to the second heat exchanger 50 through the backflow pipeline to participate in heat exchange, so that the gasification of the liquid CO2 in the second heat exchanger 59 is realized, the gasified CO2 directly flows out of the second heat exchanger 50, and the on-off is realized through the CO2 outlet valve 86. And a temperature measuring device is arranged at the end of the return pipeline entering the second heat exchanger 50 to measure the inlet temperature T5.

The present embodiment can further utilize the cold energy, or the evaporation device 84 can be omitted, so that the investment of equipment can be reduced.

Embodiment four:

the embodiment also discloses a method for exploiting the liquid oxygen and liquid methane comprehensive utilization system in the first embodiment, which comprises the following steps:

s1: the cryogenic tank car is flushed with liquid oxygen into liquid oxygen tank 11 through liquid oxygen charging connector 12 and the cryogenic tank car is flushed with liquid methane into liquid methane tank 21 through liquid methane charging connector 22.

S2: opening a liquid oxygen total liquid outlet valve 91, starting a liquid oxygen booster pump 92, and conveying liquid oxygen to the gas turbine 31 through a first liquid oxygen pipeline; the liquid methane total liquid outlet valve 101 is opened, the liquid methane booster pump 102 is started, and liquid methane is input to the gas turbine 31 through the first liquid methane pipeline. Controlling the flow rate of liquid oxygen and liquid methane flowing to the combustion energy assembly 30 by adjusting the opening degrees of the first liquid oxygen outlet valve 93 and the first liquid methane outlet valve 103; the liquid oxygen and the liquid oxygen methane are mixed and combusted in the gas turbine 31 according to a certain proportion to generate a mixed working medium of high-temperature and high-pressure water and CO2, and the gas turbine 31 drives the generator 32 to generate electricity.

S3: the CO2 generated after combustion is inputted into the first heat exchanger 40 through a pipe to exchange heat, and CO2 of normal temperature and high pressure is outputted while condensate water is separated and stored in the condensate water storage tank 110.

The liquid oxygen and the liquid methane are respectively input into the second heat exchanger 50 through a second liquid oxygen pipeline and a second liquid methane pipeline, the liquid oxygen, the liquid methane and the CO2 with normal temperature and high pressure are subjected to heat exchange in the second heat exchanger 50, so that normal temperature and high pressure oxygen, normal temperature and high pressure methane gas and low temperature and high pressure CO2 gas are obtained, the normal temperature and high pressure oxygen is stored in the oxygen storage tank 61, the normal temperature and high pressure methane gas is stored in the methane storage tank 71, and the low temperature and high pressure CO2 gas is stored in the liquid CO2 storage tank 81 through liquefaction.

The CO2 trapping and zero emission are realized, and meanwhile, the high-pressure liquid oxygen and the high-pressure liquid methane are changed into high-pressure normal-temperature high-purity gas after heat exchange, so that the device is convenient for medical treatment and production.

In the above embodiment, the temperature measuring device, the pressure measuring device, and the flow measuring device may be all those in the prior art.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The liquid oxygen and liquid methane comprehensive utilization system is characterized by comprising a liquid oxygen component, a liquid methane component, a combustion energy component, a second heat exchanger, an oxygen storage tank component, a methane storage tank component and a liquid CO2 storage tank component, wherein the inlet end of the combustion energy component is connected with the liquid oxygen component and the liquid methane component; CO2 generated after the mixed combustion of the liquid oxygen and the liquid methane in the combustion energy assembly is input into the inlet end of the second heat exchanger through a pipeline, the liquid oxygen assembly and the liquid methane assembly are further connected with the inlet end of the second heat exchanger respectively, and the outlet end of the second heat exchanger is connected with the oxygen storage tank assembly, the methane gas storage tank assembly and the liquid CO2 storage tank assembly respectively.

2. The liquid oxygen and liquid methane comprehensive utilization system according to claim 1, wherein an outlet end of the liquid oxygen component is connected with the combustion energy component through a first pump valve component, the first pump valve component comprises a liquid oxygen booster pump, the outlet end of the liquid oxygen booster pump is divided into two paths, a first path is connected with the combustion energy component, a second path is connected with the second heat exchanger, and the first path and the second path are respectively connected with a liquid oxygen liquid outlet valve.

3. The liquid oxygen and liquid methane comprehensive utilization system according to claim 1, wherein the liquid oxygen component comprises a liquid oxygen tank, a liquid oxygen filling pipe and a liquid oxygen safety pipe, and the liquid oxygen filling pipe and the liquid oxygen safety pipe are respectively connected with the liquid oxygen tank.

4. The liquid oxygen and liquid methane comprehensive utilization system according to claim 1, wherein the outlet end of the liquid methane assembly is connected with the combustion energy assembly through a second pump valve assembly, the second pump valve assembly comprises a liquid methane booster pump, the outlet end of the liquid methane booster pump is divided into two paths, the first path is connected with the combustion energy assembly, the second path is connected with the second heat exchanger, and the first path and the second path are respectively connected with a liquid methane outlet valve.

5. The liquid oxygen and liquid methane comprehensive utilization system according to claim 1, wherein the liquid methane assembly comprises a liquid methane tank, a liquid methane filling pipe and a liquid methane safety pipe, and the liquid methane filling pipe and the liquid methane safety pipe are respectively connected with the liquid methane tank.

6. The liquid oxygen and liquid methane integrated utilization system of claim 1, wherein the combustion energy component is one of a gas turbine, a boiler, and an engine, and when the combustion energy component is a gas turbine, the gas turbine is connected to a generator.

7. The system of claim 1, further comprising a first heat exchanger and a condensate storage tank, wherein CO2 is sequentially fed from the outlet end of the combustion energy assembly to the first heat exchanger and the second heat exchanger, and wherein the first heat exchanger is connected to the condensate storage tank.

8. The liquid oxygen and liquid methane comprehensive utilization system according to claim 1, wherein the oxygen storage tank assembly comprises an oxygen storage tank and an oxygen valve, an inlet end of the oxygen storage tank is connected with the second heat exchanger, and the oxygen valve is connected with an outlet end of the oxygen storage tank; the methane gas storage tank assembly comprises a methane gas storage tank and a methane gas valve, wherein the inlet end of the methane gas storage tank is connected with the second heat exchanger, and the methane gas valve is connected with the outlet end of the methane gas tank; the liquid CO2 storage tank assembly comprises a liquid CO2 storage tank and a liquid CO2 valve, wherein the inlet end of the liquid CO2 storage tank is connected with the second heat exchanger, and the liquid CO2 valve is connected with the outlet end of the liquid CO2 storage tank.

9. The liquid oxygen and liquid methane integrated utilization system of claim 1 or 8, further comprising an evaporation device, wherein an outlet end of the liquid CO2 storage tank assembly is connected to the evaporation device.

10. A method for using the liquid oxygen and liquid methane comprehensive utilization system according to any one of the claims 1-9, characterized by comprising the following steps:

s1: filling liquid oxygen into the liquid oxygen component and filling liquid methane into the liquid methane component;

s2: controlling the liquid oxygen component and the liquid methane component to simultaneously respectively transmit liquid oxygen and liquid methane to the combustion energy component, and generating kinetic energy and utilizing the kinetic energy after the liquid oxygen and the liquid methane are mixed and combusted by the combustion energy component;

s3: CO2 generated after combustion is input into the first heat exchanger through a pipeline for heat exchange and then enters the second heat exchanger, the liquid oxygen component and the liquid methane component are also respectively input into the second heat exchanger for heat exchange, so that normal-temperature high-pressure oxygen, normal-temperature high-pressure methane gas and low-temperature high-pressure CO2 gas are obtained, the normal-temperature high-pressure oxygen is stored in the oxygen storage tank component, the normal-temperature high-pressure methane gas is stored in the methane storage tank component, and the low-temperature high-pressure CO2 gas is stored in the liquid CO2 storage tank component through liquefaction.