CN112556313A - Heat supply and air separation system utilizing high-temperature and high-pressure steam and application method thereof - Google Patents
Heat supply and air separation system utilizing high-temperature and high-pressure steam and application method thereof Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
- F25J3/04357—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen and comprising a gas work expansion loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/04363—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of oxygen
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a heat supply and air separation system utilizing high-temperature and high-pressure steam and an application method thereof, relating to the technical field of air separation, and comprising an air compressor, a heat pump, a; the air compression turbine unit is a back pressure turbine, is connected to the air compressor and is used for driving the air compressor. The invention fully utilizes the energy of the steam, avoids the waste of energy caused by direct temperature and pressure reduction of the secondary high-pressure steam, realizes the problem of steam energy waste in the sulfuric acid dilution process, improves the economic benefit, greatly reduces the energy waste, has no waste gas and waste water discharge in the use process, has small environmental pollution, mature adopted air separation technology and small safety risk.
Description
Technical Field
The invention relates to the technical field of air separation, in particular to a heat supply and air separation system utilizing high-temperature and high-pressure steam and an application method thereof.
Background
The technologies for preparing oxygen and nitrogen by air separation commonly used at present comprise a low-temperature rectification technology, a membrane separation technology and a pressure swing adsorption technology, and the low-temperature rectification technology is the most mature air separation technology at present.
The main energy consumption equipment of the existing air separation device is an air compressor and a circulating supercharger, the main mode adopted in the industry at present is motor dragging, and the cost is high.
The byproduct waste heat steam (about 5.0MPa (A) and 480 ℃) produced by 6 million tons of vulcanizing devices in the production and operation processes of Jiangsutong New Material science and technology Limited company annually is about 80 tons per hour, is reduced to 1.5MPa (A) through a temperature and pressure reducing device (pressure is reduced by a pressure reducing valve and oxygen-removing water is sprayed for cooling), and is sent to each user in a garden after 329 ℃, and a large amount of steam internal energy and heat energy are wasted in the operation process of the temperature and pressure reducing device.
Disclosure of Invention
The invention mainly aims to provide a heat supply and air separation system utilizing high-temperature high-pressure steam and an application method thereof, which can utilize the high-temperature high-pressure steam generated in chemical reaction to drive an air compressor and a circulating compressor to do work, and reuse the steam after temperature reduction and pressure reduction after utilizing partial heat energy and pressure energy of the high-temperature high-pressure steam.
The purpose of the invention can be achieved by adopting the following technical scheme:
a heat supply and air separation system using high-temperature and high-pressure steam comprises
An air compressor for compressing raw air;
the air compression turbine unit is a back pressure turbine, is connected to the air compressor and is used for driving the air compressor;
the circulating air compressor is used for compressing and cooling mixed gas formed by the purified air and the circulating air passing through the cold box;
the supercharging steam turbine set is a back pressure steam turbine, is connected to the circulating air compressor and is used for driving the circulating air compressor;
the steam source is high-temperature and high-pressure steam generated in the chemical reaction process and is used as a power source for driving the air pressure steam turbine set and the supercharging steam turbine set;
the air pipe assembly comprises a plurality of pipelines, so that the steam source is respectively connected with the air pressure steam turbine set and the supercharging steam turbine set and is used for conveying steam to the air pressure steam turbine set and the supercharging steam turbine set;
the exhaust pipe assembly comprises a plurality of pipelines which are respectively arranged on the air pressure steam turbine unit and the supercharging steam turbine unit, and the tail end of the exhaust pipe assembly is connected with a heat supply pipe network for conveying steam passing through the air pressure steam turbine unit and the supercharging steam turbine unit to the heat supply pipe network.
Preferably, the breather pipe assembly comprises a first main pipe, the first main pipe is connected with a first input pipe and a second input pipe, the output end of the first input pipe is connected with the air pressure steam turbine set and used for conveying steam from the steam source to the air pressure steam turbine set, and the output end of the second input pipe is connected with the pressure-increasing steam turbine set and used for conveying steam from the steam source to the pressure-increasing steam turbine set.
Preferably, the steam source is high-temperature high-pressure steam generated by diluting high-concentration sulfuric acid, and the high-temperature high-pressure steam is steam with the pressure of 5.0MPa and the temperature of 470-490 degrees.
Preferably, the blast pipe subassembly is including first output pipeline and second trunk line, the input of first output pipeline is connected on the air compression turboset for the steam after the cooling step-down of air compression turboset is exported outwards, the input of second output pipeline is connected on pressure boost turboset, is used for the steam after the cooling step-down of pressure boost turboset of outwards exporting, the output of first output pipeline and second output pipeline all is connected with the second trunk line, the output and the heat supply pipe network of second trunk line are connected for make the steam after the cooling step-down supply low reaches user and use.
Preferably, still including reserve input pipeline, reserve input pipeline's input is connected in first trunk line, reserve input pipeline's output is connected with the pressure and temperature reduction device that is used for reducing the temperature and the pressure that come from steam source steam, be connected with reserve output pipeline on the pressure and temperature reduction device, reserve output pipeline's output and heat supply pipe network are connected for steam supply downstream user after making the cooling step-down uses.
Preferably, be provided with first steam admission emergency cut-off valve on the first input pipeline for prevent that first trunk line from continuing to carry steam to the air compression steam turbine set, be provided with second steam admission emergency cut-off valve on the second input pipeline for prevent that first trunk line from continuing to carry steam to the pressure boost steam turbine set, be provided with first exhaust and net valve on the first output pipeline, be used for opening and close passageway between first output pipeline and the second trunk line, be provided with second exhaust and net valve on the second output pipeline, be used for opening and close passageway between second output pipeline and the second trunk line.
Preferably, the steam source is further connected with a first safety pipeline, the first safety pipeline is provided with a steam discharge valve, the output end of the first safety pipeline is connected with a first emptying silencer, the first main pipeline is further connected with a second safety pipeline, the second safety pipeline is provided with a first safety valve, the output end of the second safety pipeline is connected with the first safety pipeline, and the output end of the first safety pipeline is located between the steam discharge valve and the first emptying silencer;
all be provided with reserve safe subassembly on first output pipeline and the second output pipeline, reserve safe subassembly is including first reserve pipeline, second reserve pipeline and third reserve pipeline and set up in the second unloading muffler of third reserve pipeline delivery outlet, be provided with the second relief valve on the first reserve pipeline, be provided with first atmospheric valve on the second reserve pipeline, the delivery outlet of first reserve pipeline and second reserve pipeline all is connected with third reserve pipeline.
An application method of heat supply and air separation system using high-temperature high-pressure steam comprises the following steps
Step A, high-temperature high-pressure steam generated in the chemical reaction process is used as a power source;
step B, respectively driving an air pressure steam turbine set and a booster steam turbine set by using high-temperature and high-pressure steam;
step C, the air compressor is driven by the air compression steam turbine set, and the circulating air compressor is driven by the supercharging steam turbine set;
and D, discharging the steam subjected to temperature and pressure reduction by the air pressure steam turbine set and the pressure boosting steam turbine set into a heat supply pipe network.
Preferably, step A specifically comprises the following steps
Step a1, using high-temperature and high-pressure steam generated by diluting with sulfuric acid as a power source;
step a2, inputting high-temperature and high-pressure steam into a first input pipeline and a second input pipeline respectively through a first main pipeline;
the step B specifically comprises the following steps
Step b1, allowing the high-temperature high-pressure steam to enter an air-pressure steam turbine set through a first input pipeline, and allowing the high-temperature high-pressure steam to enter a booster steam turbine set through a second input pipeline;
step b2, the high-temperature high-pressure steam consumes heat energy and pressure energy, and the couplings on the air-compression steam turbine set and the supercharging steam turbine set are respectively rotated;
step C specifically comprises the following steps
Step c1, the coupler on the air compression turbine set rotates to drive the air compressor to do work, and the coupler on the supercharging turbine set rotates to drive the circulating air compressor to do work;
the step D specifically comprises the following steps
D1, after passing through the air compression steam turbine set, the high-temperature high-pressure steam consumes part of heat energy and pressure energy to become low-temperature low-pressure steam and is conveyed to the first output pipeline, and after passing through the supercharging steam turbine set, the high-temperature high-pressure steam consumes part of heat energy and pressure energy to become low-temperature low-pressure steam and is conveyed to the second output pipeline;
d2, the air compression steam turbine set conveys low-temperature low-pressure steam to the second main pipeline through the first output pipeline, and the supercharging steam turbine set conveys low-temperature low-pressure steam to the second main pipeline through the second output pipeline;
and d3, the second main pipeline conveys the low-temperature and low-pressure steam from the air-pressure steam turbine set and the booster steam turbine set to a heat supply pipe network.
Preferably, the method also comprises a low-temperature rectification method for air separation, wherein an air compressor and a circulating air compressor used in the low-temperature rectification method are the air compressor and the circulating air compressor in the step C, the high-temperature high-pressure steam is steam with the pressure of 5.0MPa and the temperature of 470-490 ℃, and the low-temperature low-pressure steam is steam with the pressure of 1.4MPa and the temperature of 320-340 ℃.
The invention has the beneficial technical effects that:
1. the invention fully utilizes the energy of the steam, avoids the waste of energy caused by direct temperature and pressure reduction of the secondary high-pressure steam, realizes the problem of steam energy waste in the sulfuric acid dilution process, improves the economic benefit, greatly reduces the energy waste, has no waste gas and waste water discharge in the use process, has small environmental pollution, mature adopted air separation technology and small safety risk.
2. Compared with the traditional electrically-driven air separation, the air separation system has the advantages that the steam turbine replaces a motor, the steam drive replaces the electric drive, and the operation cost is only about half of that of the traditional electric drive; the operation efficiency of the whole air separation system is improved, the system operation cost is low, the energy consumption is low, and the energy is saved.
3. The cost of oxygen and nitrogen production can be reduced by 50% compared with the cost of an electrically driven oxygen and nitrogen production mode; meanwhile, when the oxygen and nitrogen are prepared, the economical efficiency of air separation is further improved, compared with the conventional air separation technology, the operation cost is reduced by about 1/2, and the system is simple to operate and convenient to operate.
4. According to the invention, because the energy consumption is reduced, the oxygen yield of the monomer and the nitrogen yield are lower in energy consumption and emission, the efficiency is higher, and the effective collection and cyclic utilization of the heat energy of the intermediate steam generated by the chemical chain are realized.
5. The high-temperature high-pressure steam becomes low-temperature low-pressure steam after being used, can be directly connected to a heat supply network for downstream users to use, can replace the original temperature and pressure reduction device, reduces the loss of steam energy in the process of reaching the downstream users, and fully utilizes the high-temperature high-pressure steam generated in chemical reaction.
Drawings
FIG. 1 is a schematic view of a heating system according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of an air separation system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1-2, the present embodiment provides a heating and air separation system using high-temperature and high-pressure steam, which includes
An air compressor for compressing raw air;
the air compression turbine unit is connected to the air compressor and used for driving the air compressor;
the circulating air compressor is used for compressing and cooling mixed gas formed by the purified air and the circulating air passing through the cold box;
the supercharging turboset is connected to the circulating air compressor and used for driving the circulating air compressor;
the steam source, can set up a main valve on the first main pipeline connected with steam source, the total delivery used for air start and stop steam, it is the high-temperature high-pressure steam that the chemical reaction produces in-process, is used for driving the air compression turboset and booster turboset as the power source;
the air pipe assembly comprises a plurality of pipelines, so that a steam source is respectively connected with the air pressure steam turbine set and the supercharging steam turbine set and is used for conveying steam to the air pressure steam turbine set and the supercharging steam turbine set;
the exhaust pipe assembly comprises a plurality of pipelines which are respectively arranged on the air pressure steam turbine unit and the supercharging steam turbine unit, and the tail end of the exhaust pipe assembly is connected with a heat supply pipe network for conveying steam passing through the air pressure steam turbine unit and the supercharging steam turbine unit to the heat supply pipe network.
In this embodiment, as shown in fig. 1, the vent pipe assembly includes a first main pipe, the first main pipe is connected with a first input pipe and a second input pipe, an output end of the first input pipe is connected with the air pressure steam turbine set for conveying steam from the steam source to the air pressure steam turbine set, and an output end of the second input pipe is connected with the pressure-increasing steam turbine set for conveying steam from the steam source to the pressure-increasing steam turbine set.
In the embodiment, as shown in FIG. 1, the steam source is high-temperature high-pressure steam generated by diluting high-concentration sulfuric acid, and the high-temperature high-pressure steam is steam of 5.0MPa and 470-490 degrees.
In this embodiment, as shown in fig. 1, the exhaust pipe assembly includes a first output pipeline, a second output pipeline and a second main pipeline, an input end of the first output pipeline is connected to the air-pressure steam turbine set, and is used for outputting the steam after the air-pressure steam turbine set is cooled and depressurized, an input end of the second output pipeline is connected to the pressure-increasing steam turbine set, and is used for outputting the steam after the pressure-increasing steam turbine set is cooled and depressurized, output ends of the first output pipeline and the second output pipeline are connected to the second main pipeline, and an output end of the second main pipeline is connected to the heat supply pipe network, and is used for supplying the steam after the temperature-decreasing and depressurizing to downstream users.
In this embodiment, as shown in fig. 1, the steam supply system further comprises a standby input pipeline, an input end of the standby input pipeline is connected to the first main pipeline, an output end of the standby input pipeline is connected to a temperature and pressure reducing device for reducing the temperature and the pressure of steam from the steam source, the temperature and pressure reducing device is connected to a standby output pipeline, and an output end of the standby output pipeline is connected to a heat supply pipe network and used for supplying the steam after temperature and pressure reduction to downstream users.
In this embodiment, when the high-temperature high-pressure steam, the steam of the downstream user, the air-pressure steam turbine set or the supercharged steam turbine set generates the interlocking signal of steam cut-off, water cut-off, power cut-off or equipment failure, the following interlocking protection actions are performed:
1. the steam inlet emergency cut-off valve associated with the air pressure steam turbine set and the supercharging steam turbine set is automatically closed, and the steam turbine set is stopped;
2. the steam discharging grid-connected valve associated with the air pressure steam turbine set and the supercharging steam turbine set is automatically and fully closed and is isolated from the heat supply pipe network;
3. the steam discharge valve is interlocked to enter an automatic adjusting state, the steam pressure of the steam source is adjusted to be constant, and overpressure is prevented;
4. the steam of the steam source passes through the temperature and pressure reducing device, and the steam pressure and the temperature of the heat supply pipe network are automatically adjusted and balanced to be constant, so that the stability of the steam for downstream low-pressure steam users is guaranteed.
5. The first output pipeline, the second output pipeline and the second safety pipeline are all provided with safety valves, and when the pressure is ultrahigh, the pressure is automatically released and discharged to a safety place;
6. all the emptying valves and safety valves of the high-pressure steam and the medium-pressure steam of the device are drained into the emptying silencer to be discharged, so that the discharge safety is guaranteed.
In the embodiment, the system can be monitored in real time during operation through the DCS, and once abnormality occurs, emptying of steam is performed, so that reliable and stable operation of the system is guaranteed.
In this embodiment, as shown in fig. 1, a first steam inlet emergency cut-off valve is arranged on the first input pipeline and used for preventing the first main pipeline from continuously conveying steam to the air-pressure steam turbine unit, a second steam inlet emergency cut-off valve is arranged on the second input pipeline and used for preventing the first main pipeline from continuously conveying steam to the supercharging steam turbine unit, a first exhaust and network connection valve is arranged on the first output pipeline and used for opening and closing a channel between the first output pipeline and the second main pipeline, and a second exhaust and network connection valve is arranged on the second output pipeline and used for opening and closing a channel between the second output pipeline and the second main pipeline.
In this embodiment, the air separation plant is a set of full-liquid air separation plant for producing argon by full-rectification in the sixth generation process, which is currently the most advanced in the industry, and has the functions of normal-temperature molecular sieve adsorption dragged by a turbine and shared by a double-supercharging turboexpander, a raw material air compressor and a circulating compressor, and structured packing in an upper tower.
In this embodiment, as shown in fig. 1, the steam source is further connected to a first safety pipeline, the first safety pipeline is provided with a steam discharge valve, an output end of the first safety pipeline is connected to a first emptying silencer, the first main pipeline is further connected to a second safety pipeline, the second safety pipeline is provided with a first safety valve, an output end of the second safety pipeline is connected to the first safety pipeline, and an output end of the first safety pipeline is located between the steam discharge valve and the first emptying silencer;
all be provided with reserve safety assembly on first output pipeline and the second output pipeline, reserve safety assembly is including first reserve pipeline, second reserve pipeline and third reserve pipeline and set up in the second of third reserve pipeline delivery outlet and blow off the muffler, is provided with the second relief valve on the first reserve pipeline, is provided with first blow off valve on the second reserve pipeline, and the delivery outlet of first reserve pipeline and second reserve pipeline all is connected with third reserve pipeline.
An application method of heat supply and air separation system using high-temperature high-pressure steam comprises the following steps
Step A, taking high-temperature and high-pressure steam generated in the chemical reaction process as a power source, and directly using steam from Torper company, namely 5.0MPa (A), and conveying at about 480 ℃ at 80 tons/hour;
step B, respectively driving an air pressure steam turbine set and a booster steam turbine set by using high-temperature and high-pressure steam;
step C, the air compressor is driven by the air compression steam turbine set, and the circulating air compressor is driven by the supercharging steam turbine set;
and D, discharging the steam subjected to temperature and pressure reduction by the air pressure steam turbine set and the pressure boosting steam turbine set into a heat supply pipe network.
In this embodiment, as shown in fig. 1, step a specifically includes the following steps
Step a1, high-temperature and high-pressure steam generated by diluting with high-concentration sulfuric acid is used as a power source;
step a2, inputting high-temperature and high-pressure steam into a first input pipeline and a second input pipeline respectively through a first main pipeline;
the step B specifically comprises the following steps
Step b1, allowing the high-temperature high-pressure steam to enter an air-pressure steam turbine set (30 tons/hour) through a first input pipeline, and allowing the high-temperature high-pressure steam to enter a booster steam turbine set (50 tons/hour) through a second input pipeline;
step b2, the high-temperature high-pressure steam consumes heat energy and pressure energy, and the couplings on the air-compression steam turbine set and the supercharging steam turbine set are respectively rotated;
step C specifically comprises the following steps
Step c1, the coupler on the air compression turbine set rotates to drive the air compressor to do work, and the coupler on the supercharging turbine set rotates to drive the circulating air compressor to do work;
the step D specifically comprises the following steps
D1, after the high-temperature high-pressure steam passes through the air-pressure steam turbine set, consuming part of heat energy and pressure energy to form low-temperature low-pressure steam, after the high-temperature high-pressure steam passes through the booster steam turbine set, consuming part of heat energy and pressure energy to form low-temperature low-pressure steam, and conveying the low-temperature low-pressure steam to a second output pipeline, wherein after the superheated steam consumes the heat energy and the pressure energy at about 5.0MPa (A) and 480 ℃, the steam is depressurized and cooled to about 1.4MPa (A) and 330 ℃;
d2, the air compression steam turbine set conveys low-temperature low-pressure steam to the second main pipeline through the first output pipeline, and the supercharging steam turbine set conveys low-temperature low-pressure steam to the second main pipeline through the second output pipeline;
and d3, the second main pipeline conveys the low-temperature low-pressure steam from the air-pressure steam turbine set and the booster steam turbine set to a low-pressure steam heat network for use by downstream users.
In this embodiment, as shown in fig. 1, a cryogenic rectification method is further included for performing air separation, and producing liquid oxygen, liquid nitrogen, liquid argon, and nitrogen products by using a cryogenic rectification principle, wherein an air compressor and a circulating air compressor used in the cryogenic rectification method are the air compressor and the circulating air compressor in step C, high-temperature and high-pressure steam is steam of 5.0MPa and 470-490 ℃, and low-temperature and low-pressure steam is steam of 1.4MPa and 320-340 ℃;
in the low-temperature rectification method, air is compressed by an air compressor, dried and purified, then pressurized by a circulating air compressor, refrigerated and liquefied by utilizing isentropic expansion and isenthalpic throttling principles, and finally heat and mass transfer is carried out in a rectification tower by utilizing the difference of the boiling point temperature of each component of the air under the same pressure, thereby achieving the purpose of separating each component of the air.
The cryogenic rectification method comprises the following specific steps:
step 1, air enters an air compressor after being filtered by an air filter to remove dust and mechanical impurities, and enters an air precooling system after being compressed;
step 2, cooling the air in an air cooling tower of an air pre-cooling system by cooling water from the middle of the air cooling tower and chilled water cooled by a water cooling tower, washing the air by water, removing water-soluble impurities, and then feeding the air into a molecular sieve purification system;
step 3, the molecular sieve purification system is composed of two purifiers, an electric heater and a steam heater, the two purifiers are switched for use, when one purifier works, the other purifier is heated and regenerated by the heater by the waste nitrogen from the fractionating tower, and the air is discharged out of the purification system after moisture, carbon dioxide and other hydrocarbons are removed by activated alumina and the molecular sieve;
step 4, mixing the air out of the purification system with circulating air from a cold box of the fractionating tower, allowing the air to enter a circulating air compressor unit for compression and cooling, allowing a part of the compressed air to enter a main heat exchanger, cooling the part of the compressed air to a certain temperature by a return gas, pumping out the cooled air, feeding the cooled air into a hot-end supercharging turbine for expansion and refrigeration, allowing the expanded air to return to the main heat exchanger, mixing the expanded air with the air subjected to partial expansion and reheating by a cold-end expander in the main heat exchanger, continuously reheating to the normal temperature, and allowing the air out of the cold box to serve as circulating;
step 5, the rest air out of the circulating compressor enters a supercharging end of a hot-end expansion machine for supercharging, is cooled by a supercharger after-cooler and then enters a supercharging end of a cold-end expansion machine for supercharging, is cooled by a cold-end supercharger after-cooler and then enters a main heat exchanger;
step 6, cooling a part of the cooled liquid to the liquefaction temperature at the bottom of the main heat exchanger, reducing the pressure and the temperature through throttling, entering a vapor-liquid separator, entering the separated liquid into the middle part of a lower tower, sending the separated gas part into the lower part of the lower tower for rectification, entering the main heat exchanger for cooling to a certain temperature for cooling, entering a cold end expander for refrigeration, entering the lower part of the lower tower for rectification, reheating the part to the normal temperature, and taking the reheated gas as circulating air out of a cold box;
step 7, rectifying the air entering the lower tower to obtain oxygen-enriched liquid air, lean liquid air and liquid nitrogen, leading out the oxygen-enriched liquid air, the liquid air and part of the liquid nitrogen from the bottom of the lower tower, the lower part of the lower tower and a condensing evaporator respectively, entering a subcooler, cooling by the reflux nitrogen and the waste nitrogen from the upper tower, throttling, depressurizing and cooling part of the liquid nitrogen, sending the liquid nitrogen out of a cold box as a product, and feeding the rest of the liquid nitrogen into the upper tower;
8, rectifying in the upper tower to obtain liquid oxygen, waste nitrogen and nitrogen at the bottom of the condensation evaporator, the upper part of the upper tower and the top of the upper tower respectively;
step 9, pumping nitrogen and polluted nitrogen out of the top of the upper tower and the upper part of the upper tower respectively, allowing the nitrogen and the polluted nitrogen to enter a subcooler, performing heat exchange, allowing part of the polluted nitrogen to enter a molecular sieve purification system after reheating to serve as regenerated gas, and allowing the rest of the polluted nitrogen and the nitrogen to enter a water cooling tower to serve as cold sources;
step 10, pumping liquid oxygen out of a condensation evaporator, supercooling the liquid oxygen, and sending the liquid oxygen out of a cold box to enter a liquid oxygen storage tank;
and step 11, pumping out the liquid nitrogen from the subcooler and conveying the liquid nitrogen into a liquid nitrogen storage tank.
And 12, in order to extract argon, extracting argon fraction gas from the lower part of the upper tower, allowing the argon fraction gas to enter a crude argon tower I, transferring heat and mass with liquid crude argon conveyed from the crude argon tower II through a circulating liquid argon pump, allowing the argon fraction gas to enter a crude argon tower II, allowing a cold source of the crude argon tower II to be oxygen-enriched liquid air subjected to supercooling, allowing the fraction gas to transfer heat and mass, removing oxygen components in the fraction gas in the crude argon tower II, allowing the fraction gas to enter a pure argon tower, respectively arranging a condenser and an evaporator at the top and the bottom of the pure argon tower, respectively allowing the heat source and the cold source to be subcooled liquid air and further throttling and cooling liquid air, rectifying the process argon in the pure argon tower, removing nitrogen components, and obtaining liquid pure argon at the bottom of the pure argon condenser.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.
Claims (10)
1. A heat supply and air separation system using high-temperature and high-pressure steam is characterized in that: comprises that
An air compressor for compressing raw air;
the air compression turbine unit is connected to the air compressor and used for driving the air compressor;
the circulating air compressor is used for compressing and cooling mixed gas formed by the purified air and the circulating air passing through the cold box;
the supercharging steam turbine set is connected to the circulating air compressor and used for driving the circulating air compressor;
the steam source is high-temperature and high-pressure steam generated in the chemical reaction process and is used as a power source for driving the air pressure steam turbine set and the supercharging steam turbine set;
the air pipe assembly comprises a plurality of pipelines, so that the steam source is respectively connected with the air pressure steam turbine set and the supercharging steam turbine set and is used for conveying steam to the air pressure steam turbine set and the supercharging steam turbine set;
the exhaust pipe assembly comprises a plurality of pipelines which are respectively arranged on the air pressure steam turbine unit and the supercharging steam turbine unit, and the tail end of the exhaust pipe assembly is connected with a heat supply pipe network for conveying steam passing through the air pressure steam turbine unit and the supercharging steam turbine unit to the heat supply pipe network.
2. A heating and air separation system using high-temperature and high-pressure steam according to claim 1, wherein: the breather pipe assembly comprises a first main pipe, a first input pipe and a second input pipe are connected to the first main pipe, the output end of the first input pipe is connected with the air pressure steam turbine set and used for enabling steam from the steam source to be conveyed to the air pressure steam turbine set, and the output end of the second input pipe is connected with the pressurization steam turbine set and used for enabling steam from the steam source to be conveyed to the pressurization steam turbine set.
3. A heating and air separation system using high-temperature and high-pressure steam according to claim 1, wherein: the steam source is high-temperature high-pressure steam generated by diluting high-concentration sulfuric acid, and the high-temperature high-pressure steam is steam with the pressure of 5.0MPa and the temperature of 470-490 degrees.
4. A heating and air separation system using high-temperature and high-pressure steam according to claim 2, wherein: the blast pipe subassembly is including first output pipeline and second trunk line, the input of first output pipeline is connected on the air compression turboset for steam after the cooling step-down of outside output through the air compression turboset, the input of second output pipeline is connected on pressure boost turboset, is used for the steam after the cooling step-down of outside output through pressure boost turboset, the output of first output pipeline and second output pipeline all is connected with the second trunk line, the output and the heat supply pipe network of second trunk line are connected for steam after making the cooling step-down supplies with low reaches user and uses.
5. A heating and air separation system using high-temperature and high-pressure steam according to claim 4, wherein: still including reserve input pipeline, reserve input pipeline's input is connected in first trunk line, reserve input pipeline's output is connected with the pressure reducer that is used for reducing the temperature that comes from steam source steam and pressure, be connected with reserve output pipeline on the pressure reducer that reduces the temperature, reserve output pipeline's output and heat supply pipe network are connected for make the steam supply low reaches user after the cooling step-down use.
6. A heating and air separation system using high-temperature and high-pressure steam according to claim 4, wherein: be provided with first quick action emergency valve of admission on the first input pipeline for prevent that first trunk line from continuing to carry steam to the air compressor turbine unit, be provided with the quick action emergency valve of second admission on the second input pipeline, be used for preventing that first trunk line from continuing to carry steam to the pressure boost turbine unit, be provided with first exhaust and net valve on the first output pipeline, be used for opening and close passageway between first output pipeline and the second trunk line, be provided with second exhaust and net valve on the second output pipeline, be used for opening and close passageway between second output pipeline and the second trunk line.
7. A heating and air separation system using high-temperature and high-pressure steam according to claim 4, wherein:
the steam source is also connected with a first safety pipeline, a steam discharge valve is arranged on the first safety pipeline, the output end of the first safety pipeline is connected with a first emptying silencer, the first main pipeline is also connected with a second safety pipeline, a first safety valve is arranged on the second safety pipeline, the output end of the second safety pipeline is connected with the first safety pipeline, and the output end of the first safety pipeline is positioned between the steam discharge valve and the first emptying silencer;
all be provided with reserve safe subassembly on first output pipeline and the second output pipeline, reserve safe subassembly is including first reserve pipeline, second reserve pipeline and third reserve pipeline and set up in the second unloading muffler of third reserve pipeline delivery outlet, be provided with the second relief valve on the first reserve pipeline, be provided with first atmospheric valve on the second reserve pipeline, the delivery outlet of first reserve pipeline and second reserve pipeline all is connected with third reserve pipeline.
8. The application method of the heat supply and air separation system using high-temperature and high-pressure steam according to any one of claims 1 to 7, characterized in that: comprises the following steps
Step A, high-temperature high-pressure steam generated in the chemical reaction process is used as a power source;
step B, respectively driving an air pressure steam turbine set and a booster steam turbine set by using high-temperature and high-pressure steam;
step C, the air compressor is driven by the air compression turbine set, and the circulating air compressor is driven by the supercharging turbine set for air separation;
and D, discharging the steam subjected to temperature and pressure reduction by the air pressure steam turbine set and the pressure boosting steam turbine set into a heat supply pipe network.
9. A method of using a heat supply and air separation system using high-temperature and high-pressure steam according to claim 8, wherein:
the step A specifically comprises the following steps
Step a1, using high-temperature and high-pressure steam generated by diluting with sulfuric acid as a power source;
step a2, inputting high-temperature and high-pressure steam into a first input pipeline and a second input pipeline respectively through a first main pipeline;
the step B specifically comprises the following steps
Step b1, allowing the high-temperature high-pressure steam to enter an air-pressure steam turbine set through a first input pipeline, and allowing the high-temperature high-pressure steam to enter a booster steam turbine set through a second input pipeline;
step b2, the high-temperature high-pressure steam consumes heat energy and pressure energy, and the couplings on the air-compression steam turbine set and the supercharging steam turbine set are respectively rotated;
step C specifically comprises the following steps
Step c1, the coupler on the air compression turbine set rotates to drive the air compressor to do work, and the coupler on the supercharging turbine set rotates to drive the circulating air compressor to do work;
the step D specifically comprises the following steps
D1, after passing through the air compression steam turbine set, the high-temperature high-pressure steam consumes part of heat energy and pressure energy to become low-temperature low-pressure steam and is conveyed to the first output pipeline, and after passing through the supercharging steam turbine set, the high-temperature high-pressure steam consumes part of heat energy and pressure energy to become low-temperature low-pressure steam and is conveyed to the second output pipeline;
d2, the air compression steam turbine set conveys low-temperature low-pressure steam to the second main pipeline through the first output pipeline, and the supercharging steam turbine set conveys low-temperature low-pressure steam to the second main pipeline through the second output pipeline;
and d3, the second main pipeline conveys the low-temperature and low-pressure steam from the air-pressure steam turbine set and the booster steam turbine set to a heat supply pipe network.
10. A method of using a heat supply and air separation system using high-temperature and high-pressure steam according to claim 9, wherein: the method also comprises a low-temperature rectification method for air separation, wherein an air compressor and a circulating air compressor used in the low-temperature rectification method are the air compressor and the circulating air compressor in the step C, the high-temperature high-pressure steam is steam with the pressure of 5.0MPa and the temperature of 470-490 ℃, and the low-temperature low-pressure steam is steam with the pressure of 1.4MPa and the temperature of 320-340 ℃.
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