CN106703919B - A kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system - Google Patents
A kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system Download PDFInfo
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- CN106703919B CN106703919B CN201611270710.1A CN201611270710A CN106703919B CN 106703919 B CN106703919 B CN 106703919B CN 201611270710 A CN201611270710 A CN 201611270710A CN 106703919 B CN106703919 B CN 106703919B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention relates to energy conversions and energy-saving and emission-reduction field, more particularly to a kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system, by cleverly connecting and controlling boiler, preheater and expanding machine, the overbottom pressure residual heat resources of pipeline for gas are comprehensively utilized, it is electric energy by pressure energy and thermal energy, the loss of high-pressure gas reducing pressure by regulating flow can be reduced；Using components such as preheater, generator and expanding machines instead of the conventional gas pressure regulating box that cannot utilize overbottom pressure waste heat.The high-temperature flue gas of discharged from coal-fired boiler is cooled down by the relatively low combustion gas of temperature, makes water vapor condensation, absorbing NOx also further reduces the discharge of pollutant.The electric energy of generator output can be directly incorporated into the uses such as the micro-capacitance sensor inside station, the supply monitoring devices such as electrical equipment, lighting apparatus.Meanwhile and the modules in parallel such as preheater, generator and expanding machine fuel gas pressure-regulating box can under effective guarantee fluctuation operating mode and emergency gas fired-boiler stable operation.
Description
Technical field
The present invention relates to energy conversion and energy-saving and emission-reduction field, more particularly to a kind of pipeline for gas overbottom pressure residual heat integrative profit
Use system.
Background technology
With in world wide to environmental protection pay attention to day by day, it is further urgent to the demand of clean energy resource, for natural gas send out
Exhibition brings opportunity.Natural gas belongs to clean energy resource, and the discharge capacity of sulfur dioxide, dust is close to zero in burning, titanium dioxide
The discharge capacity of carbon and nitrogen oxides is down to 40% and 50% respectively compared to coal；Influence of the natural gas to greenhouse effects is only stone
The 54% of oil, the 48% of coal.
In recent years, in Middle And Eastern China, Beijing-tianjin-hebei Region haze weather is wreaked havoc, and air environmental pollution situation is tighter
High, the key factor for causing this serious situation is coal-smoke pollution, is replaced by natural gas coal-fired, it will it is dirty effectively to reduce flue gas
Dye improves atmospheric environment.At present, coal-burning boiler " coal changes gas " task is all being carried out in numerous cities, carries forward vigorously gas fired-boiler
It builds, further increases demand of each city to natural gas.
However, due to Middle Eastern scarcity of resources, the natural gas needed for city mainly passes through pressure piping from other places
Input.The high-pressure natural gas come by the conveying of high pressure Trunk-line, in incity, natural gas reception door station, voltage regulating station, are required for root
It is depressured according to the supply gas pressure requirement of downstream user, then can be supplied to the uses such as city gas user, industrial and commercial user.
In pipeline for gas, high-pressure natural gas pressure after pressure regulation is down to the middle pressure standard of 0.2~0.4MPa (G), into gas-fired boiler
Stove burns, and exports hot water or steam supply town dweller uses.High-pressure natural gas will generate very big during pressure regulation
Pressure drop, while release substantial amounts of pressure energy.This process is mostly realized by fuel gas pressure-regulating box at present, pressure energy direct losses and
It is not utilized.Meanwhile gas fired-boiler discharge high-temperature flue gas be typically due to heat taste it is not high, it is difficult to utilize, also in vain
It wastes, a small amount of pollutant nitrogen oxides is not also handled.
Traditional fuel gas pressure-regulating box is substituted using turbine power generation unit sled block, the overbottom pressure residual heat resources of pipeline for gas are comprehensive
It closes and utilizes, be electric energy by pressure energy and thermal energy, the loss of high-pressure gas reducing pressure by regulating flow can be reduced.However, it is related to combustion gas at present
The research and existing patented technology that pressure energy utilizes focus mostly at natural valve station, and no residual heat resources can utilize, output
Electric energy can not internal digestion.Fuel gas temperature usually after expansion is relatively low, is used to ice making or supplies other to need cold
Process equipment.
The content of the invention
Based on the above situation, it is necessary to provide a kind of pressure energy that would sit idle for and discarded thermal energy carries out comprehensive reutilization
Pipeline for gas overbottom pressure waste heat comprehensive utilization system.
A kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system, including：Preheater, turbo-expander, gas fired-boiler and
Generator, the pre-heating intaking mouth of the preheater are connected with high-pressure gas pipeline, the preheating gas outlet of the preheater and turbine
The air inlet connection of expanding machine, the gas outlet of the turbo-expander and the air inlet of boiler connect, the gas outlet of the boiler
It is connected with the heating air inlet of preheater, the heating gas outlet of the preheater is connected with low-temperature flue gas pipeline；The turbine is swollen
Swollen machine is connected with generator drive gear, and the generator is electrically connected with electrical load.
Further, turbine speed governing valve is additionally provided between the preheater pre-heating intaking mouth and high-pressure gas pipeline, it is described
Turbine speed governing valve is in parallel for single throttle valve or by multiple throttle valves.
Further, the boiler air inlet is also directly connected with high-pressure gas pipeline, the boiler air inlet and height
Fuel gas pressure-regulating box is equipped between compression ignition feed channel and carries out pressure regulation, the fuel gas pressure-regulating box is single channel, two-way or multi-channel parallel.
As an improvement the preheater is one group of preheater, the preheater group includes at least level-one preheater, institute
Turbo-expander is stated as one group of turbo-expander, the Turbine expansion unit includes at least level-one turbo-expander；Upper level is saturating
The gas outlet of flat expanding machine is connected with next stage preheater pre-heating intaking mouth；The boiler exit gas mouth adds respectively with preheaters at different levels
Hot air inlet connects, and the preheater heating gas outlets at different levels are connected respectively with low-temperature flue gas pipeline.
As a further improvement, being additionally provided with vortex-shedding meter between the fuel gas pressure-regulating box and boiler air inlet, control
The combustion gas stream magnitude that system is fed back according to the vortex-shedding meter automatically adjusts the turbine speed governing valve and the fuel gas pressure-regulating box
Aperture.
Specifically, the preheater group is appointing in shell-and-tube heat exchanger, double pipe heat exchanger or plate-fin heat exchanger
What one or more combination；The Turbine expansion unit is multistage footpath axial-flow type expanding machine or multiatage axial flow expanding machine
Or any combination of above two structure.
Specifically, the generator is explosion-proof power generator, the explosion-proof power generator is flame-proof type structure or increased safety knot
Structure or positive pressure type structure.
Specifically, being additionally provided with retarder between the explosion-proof power generator and Turbine expansion unit, the retarder is multistage
Parallel axle construction either multi-stage planetary drive or with the turbo-expanders at different levels collectively form overall gear assembling
Formula structure.
Further, the turbine speed governing valve, preheater group, Turbine expansion unit, retarder, the common structure of explosion-proof power generator
Block is prized into turbine power generation unit, the turbine power generation unit sled block is stationary structure or moveable structure.
As an improvement the preheater group includes level-one preheater and two level preheater, the Turbine expansion unit
Including level-one turbo-expander and two level turbo-expander, the level-one preheater pre-heating intaking mouth connects with high-pressure gas pipeline
It connects, the level-one preheater preheating gas outlet is connected with level-one turbo-expander air inlet, the level-one turbo-expander outlet
Mouth is connected with two level preheater pre-heating intaking mouth, and the two level preheater preheating gas outlet connects with two level turbo-expander air inlet
It connects, the two level turbo-expander gas outlet is connected with boiler air inlet；The boiler exit gas mouth respectively with level-one preheater and
The heating air inlet connection of two level preheater, the heating gas outlet of the level-one preheater and two level preheater respectively with low temperature cigarette
Feed channel connects.
A kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system of the present invention, by the way that boiler, preheater and expansion is adroit
Wonderful connection and control comprehensively utilizes the overbottom pressure residual heat resources of pipeline for gas, is electric energy by pressure energy and thermal energy, can
Reduce the loss of high-pressure gas reducing pressure by regulating flow；Using components such as preheater, generator and expanding machines instead of cannot utilize more than overbottom pressure
The conventional gas pressure regulating box of heat.The high-temperature flue gas of discharged from coal-fired boiler is cooled down by the relatively low combustion gas of temperature, makes water vapor condensation,
Absorbing NOx also further reduces the discharge of pollutant.It is internal that the electric energy of generator output can be directly incorporated into a station
Micro-capacitance sensor, the supply uses such as monitoring devices such as electrical equipment, lighting apparatus.Meanwhile and preheater, generator and expanding machine etc.
The fuel gas pressure-regulating box of modules in parallel can effective guarantee fluctuation operating mode and emergency under gas fired-boiler stable operation.
Description of the drawings
Fig. 1 is a kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system structure diagram of the present invention.
Specific embodiment
In order to become apparent from the objectives, technical solutions, and advantages of the present invention, with reference to the accompanying drawings and embodiments, to this hair
It is bright to be further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
A kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system of the present invention, including：Preheater, turbo-expander, combustion gas
Boiler and generator, the pre-heating intaking mouth of the preheater are connected with high-pressure gas pipeline, the preheater pre-heating intaking mouth with
Be additionally provided with turbine speed governing valve between high-pressure gas pipeline, the turbine speed governing valve for single throttle valve or by multiple throttle valves simultaneously
Connection；The preheating gas outlet of the preheater and the air inlet of turbo-expander connect, the gas outlet of the turbo-expander and pot
The air inlet connection of stove, the gas outlet of the boiler and the heating air inlet of preheater connect, the heating outlet of the preheater
Mouth is connected with low-temperature flue gas pipeline；The turbo-expander is connected with generator drive gear, and the generator and electrical load are electrical
Connection.
Boiler air inlet is also directly connected with high-pressure gas pipeline, is set between the boiler air inlet and high-pressure gas pipeline
There is fuel gas pressure-regulating box to carry out pressure regulation, the fuel gas pressure-regulating box is single channel, two-way or multi-channel parallel.The turbine speed governing valve, in advance
Hot device, turbo-expander, retarder, explosion-proof power generator collectively form turbine power generation unit sled block, turbine power generation unit sled block with
Conventional gas pressure regulating box is in parallel, can under effective guarantee fluctuation operating mode and emergency gas fired-boiler stable operation；The turbine
Generating set sled block is stationary structure or moveable structure.
As a kind of preferred embodiment, preheater is one group of preheater, and preheater group includes at least level-one preheater, turbine
Expanding machine is one group of turbo-expander, and Turbine expansion unit includes at least level-one turbo-expander；Upper level turbo-expander
Gas outlet is connected with next stage preheater pre-heating intaking mouth；The boiler exit gas mouth connects respectively with preheaters at different levels heating air inlet
It connects, the preheater heating gas outlets at different levels are connected respectively with low-temperature flue gas pipeline.
As the preferred embodiment of the present invention, the preheater group includes two-stage preheater, is respectively level-one preheating
Device and two level preheater, the Turbine expansion unit include two stage turbine expanding machine, are respectively level-one turbo-expander and two level
Turbo-expander.It is specific as shown in Figure 1：
Pipeline for gas overbottom pressure waste heat comprehensive utilization system provided by the invention includes：Turbine speed governing valve 1, level-one preheater
2, two level preheater 3, level-one turbo-expander 4, two level turbo-expander 5, retarder 6, explosion-proof power generator 7, inside boiler room
Micro-capacitance sensor 8, electrical load 9, fuel gas pressure-regulating box 10, vortex-shedding meter 11, gas fired-boiler 12；The equipment 1~7 forms turbine hair
Motor group prizes block, and the turbine power generation unit sled block is stationary structure or moveable structure.
Wherein, 2 pre-heating intaking mouth of level-one preheater is connected with high-pressure gas pipeline, and the level-one preheater 2 preheats outlet
Mouth is connected with 4 air inlet of level-one turbo-expander, 4 gas outlet of level-one turbo-expander and 3 pre-heating intaking of two level preheater
Mouth connection, the two level preheater 3 preheat gas outlet and are connected with 5 air inlet of two level turbo-expander, the two level turbine expansion
5 gas outlet of machine is connected with 12 air inlet of boiler；12 gas outlet of boiler respectively with level-one preheater 2 and two level preheater 3
It heats air inlet to connect, the heating gas outlet of the level-one preheater 2 and two level preheater 3 connects respectively with low-temperature flue gas pipeline
It connects.
As preferred embodiment, vortex-shedding meter is additionally provided between 12 air inlet of the fuel gas pressure-regulating box 10 and boiler
11, the fuel gas pressure-regulating box 10 and the sled block parallel running of turbine power generation unit, control system are anti-according to the vortex-shedding meter 11
The combustion gas stream magnitude of feedback automatically adjusts the aperture of the turbine speed governing valve 1 and the fuel gas pressure-regulating box 10.
With seasonal variation, user can change the demand of heat supply, therefore also pipeline for gas 12 can be caused to fire
Gas flow needed for burning.In order to realize under the gas flow operating mode of fluctuation, turbine power generation unit sled block being capable of safety and stability
Operation, need to configure fuel gas pressure-regulating box 10 and turbine power generation unit sled block parallel running.In the case where setting demand combustion gas stream magnitude,
The actual combustion gas stream magnitude that control system is fed back by vortex-shedding meter 11, automatic adjustment turbine speed governing valve 1 and fuel gas pressure-regulating box
10 aperture.When gas flow is normal, turbine speed governing valve 1 works, control level-one turbo-expander 4 and two level turbo-expander
5 invariablenes turning speed, fuel gas pressure-regulating box 10, which is closed, not to work.When gas flow demand increases, 1 aperture of control turbine speed governing valve is not
Become, gradually increase the aperture of fuel gas pressure-regulating box 10, the gas quantity increased is made to enter combustion gas by 10 expenditure and pressure of fuel gas pressure-regulating box
Boiler 12.When gas flow demand reduces, fuel gas pressure-regulating box 10, which is closed, not to work, and control turbine speed governing valve 1 is gradually reduced out
Degree makes to reduce by the gas quantity that turbine power generation unit is prized after block depressurizes into gas fired-boiler 12.
As a preferred embodiment, the preheater group is shell-and-tube heat exchanger, double pipe heat exchanger or plate-fin heat exchanger
Any one or more of combination；The Turbine expansion unit is multistage footpath axial-flow type expanding machine or multiatage axial flow
Any combination of expanding machine or above two structure.
Specifically, the generator is explosion-proof power generator, the explosion-proof power generator is flame-proof type structure or increased safety knot
Structure or positive pressure type structure.Retarder is additionally provided between the explosion-proof power generator and Turbine expansion unit, the retarder is more
The parallel axle construction of grade either multi-stage planetary drive or collectively forms overall gear group with the turbo-expanders at different levels
Dress formula structure.
High-pressure gas enters the combustion gas after the turbine power generation unit prizes block and the fuel gas pressure-regulating box 10 depressurizes
Boiler 12 burns, external quantity of heat given up, while generates high-temperature flue gas into the level-one preheater 2 and two level preheater 3, preheating
Cool down discharge after high-pressure gas.The turbine power generation unit sled block output electric energy is into micro-capacitance sensor 8 inside the boiler room, for institute
Electrical load 9 is stated to use.
Preferably, the admission pressure of high-pressure gas is 0.5~3MPa, and charge flow rate is 5000~100000Nm3/h, described
The intake air temperature of level-one turbo-expander 4 and two level turbo-expander 5 is 50~100 DEG C, the exhaust temperature of the gas fired-boiler 12
It spends for 10~30 DEG C；It is 0.1~2MW that the turbine power generation unit, which prizes packaged machine generated energy,.
It is appreciated that in above-mentioned pipeline for gas overbottom pressure comprehensive waste-heat utilizing device operational process, when high-pressure gas passes through
After turbine speed governing valve 1 reaches setting inlet pressure and flow, preheated using level-one preheater 2, into level-one turbo-expander 4
Entrance expands in first order jet nozzle and active wheel, subsequently enters two level preheater 3 and preheats, it is swollen to be again introduced into compound expansion machine 5
It is swollen, promote the rotation acting of turbine expansion machine rotor.Since rotor speed is higher, rotating speed need to be down to by retarder 6 put it is explosion-proof
The rated speed of generator 7, and then explosion-proof power generator 7 is driven to generate electricity, output electric energy is incorporated to micro-capacitance sensor 8 inside boiler room and supplies in factory
Electrical load 9 uses.Low-pressure fuel gas after expansion enters gas fired-boiler 12 and burns, and externally exports thermal energy and is used for town users,
Generate high-temperature flue gas simultaneously and enter level-one preheater 2 and two level preheater 3, high-temperature flue gas in every level-one preheater with combustion gas into
Row sufficiently heat exchange, improves temperature and enthalpy, and then increases the output work per level-one turbo-expander.High-temperature flue gas is cold by combustion gas
But after, contained vapor gradually condenses, and condensed water absorbs largely harmful nitrogen oxides, subsequent discharges into special flue gas leading
Road.
Pipeline for gas overbottom pressure comprehensive waste-heat utilizing device provided by the invention have it is compact-sized, take up little area, run surely
Calmly, the characteristics of reliability is high.It can comprehensively utilize the overbottom pressure residual heat resources of pipeline for gas, be by pressure energy and thermal energy
Electric energy reduces the loss of high-pressure gas reducing pressure by regulating flow, while reduces the discharge of nitrogen oxides, realizes energy saving and emission reduction dual work(
Effect.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of pipeline for gas overbottom pressure waste heat comprehensive utilization system, it is characterised in that including：Preheater, turbo-expander, combustion
Gas boiler and generator, the pre-heating intaking mouth of the preheater are connected with high-pressure gas pipeline, the preheating outlet of the preheater
Mouth is connected with the air inlet of turbo-expander, and the gas outlet of the turbo-expander and the air inlet of boiler connect, the boiler
Gas outlet and preheater heating air inlet connect, the heating gas outlet of the preheater is connected with low-temperature flue gas pipeline；Institute
It states turbo-expander to be connected with generator drive gear, the generator is electrically connected with electrical load.
2. pipeline for gas overbottom pressure waste heat comprehensive utilization system as described in claim 1, which is characterized in that the preheater is pre-
Turbine speed governing valve is additionally provided between hot air inlet and high-pressure gas pipeline, the turbine speed governing valve is for single throttle valve or by more
A throttle valve is in parallel.
3. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 2, which is characterized in that the boiler air inlet
Mouth is also directly connected with high-pressure gas pipeline, and fuel gas pressure-regulating box is equipped between the boiler air inlet and high-pressure gas pipeline and is carried out
Pressure regulation, the fuel gas pressure-regulating box are single channel, two-way or multi-channel parallel.
4. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 3, which is characterized in that the preheater is
One group of preheater, the preheater group include at least level-one preheater, and the turbo-expander is one group of turbo-expander, described
Turbine expansion unit includes at least level-one turbo-expander；The gas outlet of upper level turbo-expander is preheated with next stage preheater
Air inlet connects；The boiler exit gas mouth is connected respectively with preheaters at different levels heating air inlet, and the preheaters at different levels heat out
Gas port is connected respectively with low-temperature flue gas pipeline.
5. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 4, which is characterized in that the gas pressure regulating
Vortex-shedding meter, the gas flow that control system is fed back according to the vortex-shedding meter are additionally provided between case and boiler air inlet
Value automatically adjusts the aperture of the turbine speed governing valve and the fuel gas pressure-regulating box.
6. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 5, which is characterized in that the preheater group
For the combination of any one or more of shell-and-tube heat exchanger, double pipe heat exchanger or plate-fin heat exchanger；The turbine
It is the multistage footpath axial-flow type expanding machine either any combination of multiatage axial flow expanding machine or above two structure to expand unit.
7. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 6, which is characterized in that the generator is
Explosion-proof power generator, the explosion-proof power generator are flame-proof type structure either increased safety structure or positive pressure type structure.
8. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 7, which is characterized in that the explosion-proof power generation
Retarder is additionally provided between machine and Turbine expansion unit, the retarder is multistage parallel axle construction or multi-stage planetary gear
Structure collectively forms overall gear modular construction with the turbo-expanders at different levels.
9. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 8, which is characterized in that the turbine speed governing
Valve, preheater group, Turbine expansion unit, retarder, explosion-proof power generator collectively form turbine power generation unit sled block, the turbine hair
Motor group sled block is stationary structure or moveable structure.
10. pipeline for gas overbottom pressure waste heat comprehensive utilization system as claimed in claim 9, which is characterized in that the preheater
Group includes level-one preheater and two level preheater, and the Turbine expansion unit includes level-one turbo-expander and two level turbine expansion
Machine, the level-one preheater pre-heating intaking mouth are connected with high-pressure gas pipeline, the level-one preheater preheating gas outlet and level-one
Turbo-expander air inlet connects, and the level-one turbo-expander gas outlet is connected with two level preheater pre-heating intaking mouth, described
Two level preheater preheating gas outlet is connected with two level turbo-expander air inlet, the two level turbo-expander gas outlet and boiler
Air inlet connects；Heating air inlet of the boiler exit gas mouth respectively with level-one preheater and two level preheater is connected, and described one
The heating gas outlet of grade preheater and two level preheater is connected respectively with low-temperature flue gas pipeline.
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