CN1556347A - Industrial boiler back pressure type electric generating method - Google Patents
Industrial boiler back pressure type electric generating method Download PDFInfo
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- CN1556347A CN1556347A CNA2004100216483A CN200410021648A CN1556347A CN 1556347 A CN1556347 A CN 1556347A CN A2004100216483 A CNA2004100216483 A CN A2004100216483A CN 200410021648 A CN200410021648 A CN 200410021648A CN 1556347 A CN1556347 A CN 1556347A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The disclosed combined heat and power system possessing full heat utilization function, according to certain mode connects following units: main boiler, auxiliary boiler, steam mixer in high and low temperature, back-pressure type steam turbo generator, steam mixer in high and low pressure etc. equipment and temperature sensor, pressure sensor, electric flow control valve, electric controllable cut off valve etc. control parts as well as conduit fittings. Comparing prior art, the invention overcomes low effective thermal utilization factor providing multifunctional and multipurpose technique suitable for large, middle and small type combined heat and power system.
Description
Technical field
The invention belongs to the pyroelectric technology field, relate in particular to a kind of Industrial Boiler back pressure type electricity-generating method.
Background technology
Because historical reasons, boiler is divided into station boiler, Industrial Boiler, civil boiler by its purposes.Different boilers have different purposes.The mode that boiler technology is divided by different purposes had once satisfied the needs of different departments preferably.Along with science and technology and expanding economy, aforesaid way has become the major reason of present energy huge waste, becomes the bottleneck problem of industry energy conservation consumption reduction, reduction energy cost.
The present recoverable amount of industrial boilers in China surpasses 600,000, and 1,200,000 steam ton, about 600,000,000 tons in year consumption coal.Remove because of arts demand, the minority Industrial Boiler is provided with outside the steam superheating device, and most Industrial Boilers are the saturated vapor stove, can only heat supply can not be used to the purpose of generating electricity.
Back pressure type cogeneration mode, its available heat utilization rate is 100% in theory, is with the most scientific and reasonable mode in the hot mode.Because boiler is divided into aforesaid way by purposes, various boilers have fixing architectural feature and fixing purposes, make the universal utilization of back pressure type cogeneration mode become very difficult problem.Transform original 70T/h boiler heating system as 100T/h boiler back pressure type power generation and heat supply system as zunyi, guizhou alkali factory, the demolition of original boiler room, original heating boiler can only be eliminated need not, and be replaced by medium-pressure boiler with superheated vapor gas deliverability.The means of production that part is eliminated in this technological transformation are worth more than 1,000 ten thousand yuan 4,000 ten thousand yuan of newly-increased investments.China adopts the industrial enterprise of above-mentioned heat-supplying mode a lot of, as the Industrial Boiler of original production saturated vapor is all eliminated, will inevitably cause the huge waste of the means of production, and must increase huge investment in technological transformation.
Existing superheated steam boiler and wet steamer have a common ground on the working medium flowage structure, promptly working medium enters boiler after the economizer preheating, are output when being heated to required output parameter.Above-mentioned working medium flowage structure mode causes:
A, fluid properties control system complexity, as: overhead steam boiler need adopt baroque temperature reducing system and combustion control system that superheat steam temperature is controlled.Because furnace load is big, increased the difficulty of Combustion Process Control, reduced the accuracy of control.Adopt the mode of spray desuperheating control superheat steam temperature, reduced the superheated steam quality.
The steam of b, the output of saturated vapor stove can not be used for generating.
Existing back pressure type cogeneration system generally adopts the bleeder heat supply and coagulates the mode that the generating of gas formula combines, and the working medium circulation is adopted and coagulated but way of recycling and coagulate the water way of recycling with hot device of air cooling, causes:
A, condensed water recovering system disperse, and difficulty is incorporated into the power networks;
B, still double-curve cooling column need be set, increase capital expenditure;
C, still fail to avoid thermal pollution and heat loss, can not realize the full heat utilization of working medium.
Summary of the invention
The objective of the invention is to overcome the single disadvantage that traditional mode had of boiler purposes, by the irrational situation of electrical production integral layout that existing boiler purposes division of labor pattern causes, existing working medium flowage structure, working medium endless form, the technical unreasonable place of system control mode.And a kind of means of production of avoiding that provide are wasted in a large number, reduce the investment in technological upgrading expense, break the bottleneck of industry energy conservation consumption reduction, advance the development of energy-conservation cause and change the Industrial Boiler back pressure type electricity-generating method that Industrial Boiler is carried out the cogeneration technological transformation that is applicable to that has electrical production mode and electrical production layout now.
A kind of Industrial Boiler back pressure type electricity-generating method of the present invention may further comprise the steps:
A, main stove, secondary stove are set according to the certain heat of working medium output allocation proportion, its specific practice is in total amount of heat output allocation proportion, main stove and accessory is had produce the heat capacity that saturated vapor had, and account for 70%～95% in the total amount of heat output allocation proportion, make secondary stove and accessory that the required heat capacity of overheated above-mentioned saturated vapor amount be arranged, and account for 5%～30% in the total amount of heat output allocation proportion, main stove is connected with pipeline with secondary stove, formation has the mode of heating of conjuncted structure, and working medium is carried out the segmentation heating;
B, in the adapter between main stove and the secondary stove, be provided with diversion three-way, end with the bypass pipe which is provided with electric flow control valve is connected with diversion three-way, the other end is connected with high low temperature steam mixer, secondary stove is connected with high low temperature steam mixer, and in the adapter between high low temperature steam mixer and the secondary stove, establish temperature sensor, connect high low temperature steam mixer outlet and the import of back pressure type steam turbine generator with the superheated steam house steward, and correct position is established temperature sensor on the superheated steam house steward, provide the electric flow control valve of being located on the bypass pipe required control signal by the temperature sensor of being located on the superheated steam house steward, the saturated vapor bypass flow is controlled, provide the combustion vapour electric flow control valve of being located on the secondary stove fuel inlet tube required control signal by temperature sensor, combustion process to secondary stove is controlled, and adopts the saturated vapor bypass flow is controlled and secondary stove combustion process controlled the interlock control mode that combines superheated steam output state parameter is implemented control;
C, employing has the back pressure type steam turbine generator of single-stage or multistage air suction mode, on the pump-line of back pressure type steam turbine generator, establish electric flow control valve, between back pressure type steam turbine generator exhaust tube and back pressure type steam turbine generator outlet pipe, establish the high-low pressure steam mixer, the high-low pressure steam mixer is positioned at after the electric flow control valve, on the heating steam house steward behind the high-low pressure steam mixer, establish pressure sensor, provide the required control signal of electric flow control valve on the exhaust tube that the high pressure of back pressure type steam turbine generator is bled by pressure sensor, the low pressure exhaust mixing ratio is implemented the pressure-sensitive flow control mode of control heating steam pressure is controlled, to guarantee that heating steam house steward be connected with the necessary steam pressure of thermic devices behind pressure sensor with thermic devices;
D, after with thermic devices, establish steam trap connection, between steam trap connection and economizer, establish high-temperature condensate water recovery unit with segmentation feedback system, the concrete set-up mode of high-temperature condensate water recovery unit is: the condensate water import base that steam trap connection exports and high-temperature condensate water recovery unit is gathered on the jar is connected with condensate pipe, indirect steam outlet base in the set jar and make-up water import base respectively with oxygen-eliminating device on air inlet pipe be connected with outlet pipe, with on switching in the high-temperature condensate water recovery unit jar and mutually pipe be connected in the concrete setting of finishing high-temperature condensate water recovery unit on the exhaust tube between electric flow control valve and the high-low pressure steam mixer, behind high-temperature condensate water recovery unit, establish oil expeller successively, tramp iron separator, copper-removing device, connect the outlet of copper-removing device and the import of feed pump with pipeline, at last the feed pump outlet is connected with pipeline with the economizer import, again economizer exit is connected with main stove admission port;
Industrial Boiler back pressure type electricity-generating method of the present invention can also further be realized by following technical measures.
On the superheated steam house steward, establish threeway; on the heating steam house steward behind the pressure sensor, establish threeway; between above-mentioned threeway, establish the bypass pipe that electronic control stop valve is housed on it; system is carried out the protection switching controls, the normal heat supply of system during with the maintenance of assurance back pressure type steam turbine generator outage.
Industrial Boiler back pressure type electricity-generating method of the present invention, effect are preferably according to accounting for 75%～85% in the total amount of heat export ratio and the main stove of producing saturated vapor are set and account for the secondary stove that 15%～25% in total amount of heat export ratio setting has required overheated saturated vapor heat capacity.
The present invention compared with prior art has tangible beneficial effect, and by above technical scheme as can be known, the present invention has realized aforesaid goal of the invention preferably, and has overcome the disadvantage that prior art exists preferably:
A, provide a kind of multi-functional multi-purpose cogeneration core technology that can be used for, it is low to have overcome existing station boiler available heat utilization rate, the heat utilization entirely of existing cogeneration system, existing saturated vapor stove can not be used to the to generate electricity weak point of purpose;
B, overcome the complicated isostructuralism problem of the control system complexity that electricity generation system, cogeneration system cause because of the working medium flow process is unreasonable, heat regenerative system;
C, about 600,000 industrial steam boilers of possessing at present for China carry out the technological transformation of cogeneration, and the science scheme is provided.The present invention has overcome can not use the disadvantage that the Industrial Boiler of producing saturated vapor carries out cogeneration, only need behind original boiler, to be provided with secondary stove and control corresponding mechanism, can carry out cogeneration, thereby overcome existing heating system is carried out the disadvantage that the cogeneration transformation must be changed boiler, save a large amount of funds for technical innovation.
D, the present invention can overcome the whole irrational disadvantage of Technology of Electrical Power Generation layout, can optimize the industrial structure in electrical production field.
The present invention has the incomparable regulation and control flexibility of prior art, can be widely used in large, medium and small type cogeneration system, especially is suitable as the preferential selection scheme that medium-sized and small enterprises carry out technological transformation.
Universal utilization of the present invention will significantly reduce the energy waste that the transmission of electricity of long distance long-range causes, and reduce electric power and carry equipment investment, reduce the risk crisis of large-scale power interconnection in accident, promote the development of China's distributed energy.In a word, the universal utilization of Industrial Boiler back pressure type electricity-generating method provided by the present invention will produce the important social economic benefit, and for enterprise saves a large amount of energy costs, steam ton by each and can obtain electric power 70～150,000 W, it is popularized and utilizes the annual economic benefit that can produce about 2,000 hundred million.
Description of drawings
Accompanying drawing is a process chart of the present invention.
1, main stove; 2, diversion three-way; 3, electric flow control valve; 4, secondary stove; 5, bypass pipe; 6, temperature sensor; 7, high low temperature steam mixer; 8, temperature sensor; 9, superheated steam house steward; 10, back pressure type steam turbine generator; 11, electric flow control valve; 12, pressure sensor; 13, high-low pressure steam mixer; 14, heating steam house steward; 15, use thermic devices; 16, steam trap connection; 17, high-temperature condensate water recovery unit; 18, oil expeller; 19, tramp iron separator; 20, copper-removing device; 21, feed pump; 22, combustion vapour electric flow control valve; 23, economizer; 24, threeway; 25, threeway; 26, electronic control stop valve; 27, bypass pipe; 28, condensate pipe; 29, condensate pipe; 30, condensate pipe; 31, set jar; 32, condensate water import base; 33, condensate water import base; 34, condensate water import base; 35, indirect steam outlet base; 36, make-up water import base; 37, switch jar; 38 also manage mutually.
The specific embodiment
A kind of Industrial Boiler back pressure type electricity-generating method of the present invention may further comprise the steps:
1, according to the certain heat output allocation proportion of working medium main stove 1, secondary stove 4 are set, its specific practice is in total amount of heat output allocation proportion, main stove 1 is had produce the heat capacity that saturated vapor had, and account for 75% in the total amount of heat output allocation proportion, make secondary stove 4 have the required heat capacity of overheated above-mentioned saturated vapor amount, and account for 25% in the total amount of heat output allocation proportion, main stove 1 is connected with secondary stove 4 usefulness pipelines, formation has the mode of heating of conjuncted structure, and working medium is carried out the segmentation heating;
2, in the adapter between main stove 1 and the secondary stove 4, be provided with diversion three-way 2, end with the bypass pipe 5 which is provided with electric flow control valve 3 is connected with diversion three-way 2, the other end is connected with high low temperature steam mixer 7, secondary stove 4 is connected with high low temperature steam mixer 7, and in the adapter between high low temperature steam mixer 7 and the secondary stove 4, establish temperature sensor 6, connect high low temperature steam mixer 7 outlets and 10 imports of back pressure type steam turbine generator with superheated steam house steward 9, and correct position is established temperature sensor 8 on superheated steam house steward 9, provide the electric flow control valve be located on the bypass pipe 53 required control signal by being located at temperature sensor 8 on the superheated steam house steward 9, the saturated vapor bypass flow is controlled, provide the combustion vapour electric flow control valve be located on secondary stove 4 fuel inlet tubes 22 required control signal by temperature sensor 6, combustion process to secondary stove 4 is controlled, and adopts the saturated vapor bypass flow is controlled and secondary stove 4 combustion processes controlled the interlock control mode that combines superheated steam output state parameter is implemented control;
3, employing has the back pressure type steam turbine generator 10 of single-stage or multistage air suction mode, on the pump-line of back pressure type steam turbine generator 10, establish electric flow control valve 11, between back pressure type steam turbine generator 10 exhaust tubes and back pressure type steam turbine generator 10 outlets, establish high-low pressure steam mixer 13, high-low pressure steam mixer 13 is positioned at after the electric flow control valve 11, on the heating steam house steward 14 behind the high-low pressure steam mixer 13, establish pressure sensor 12, provide the electric flow control valve 11 required control signals on the exhaust tube that the high pressure of back pressure type steam turbine generator 10 is bled by pressure sensor 12, the low pressure exhaust mixing ratio is implemented the pressure-sensitive flow control mode of control heating steam pressure is controlled, to guarantee that heating steam house steward 14 is connected with thermic devices 15 necessary steam pressures behind pressure sensor 12 with thermic devices 15;
4, after with thermic devices 15, establish steam trap connection 16, between steam trap connection 16 and economizer 23, establish high-temperature condensate water recovery unit 17 with segmentation feedback system, the concrete set-up mode of high-temperature condensate water recovery unit 17 is: with the condensate water import base 32 on steam trap connection 16 outlets and the high-temperature condensate water recovery unit 17 set jars 31,33,34 use condensate pipe 28 respectively, 29,30 connect, indirect steam outlet base 35 in the set jars 31 and make-up water import base 36 respectively with oxygen-eliminating device on air inlet pipe be connected with outlet pipe, with switch in the high-temperature condensate water recovery unit 17 on jars 37 and manage the concrete setting of finishing high-temperature condensate water recovery unit 17 on 38 exhaust tubes that are connected between electric flow control valve 11 and the high-low pressure steam mixer 13 mutually, behind high-temperature condensate water recovery unit 17, establish oil expeller 18 successively, tramp iron separator 19, copper-removing device 20, connect the outlet of copper-removing device 20 and the import of feed pump 21 with pipeline, at last feed pump 21 outlets are connected with pipeline with economizer 23 imports, again economizer 23 outlets are connected with main stove 1 admission port;
5, on superheated steam house steward 9, establish threeway 24; on the heating steam house steward 14 behind the pressure sensor 12, establish threeway 25; between above-mentioned threeway, establish the bypass pipe 27 that electronic control stop valve 26 is housed on it; system is carried out the protection switching controls, the normal heat supply of system when shutting down maintenance with assurance back pressure type steam turbine generator 9.
By the technological approaches that uses above-mentioned steps form a kind of have export working medium is heated to form saturated vapor in main stove 1 after, pipeline between main stove 1 and secondary stove 4 enters secondary stove 4 is become superheated steam by after overheated, superheated steam enters the 10 expansion actings of back pressure type steam turbine generator through superheated steam house steward 9, steam after the acting is through electric flow control valve 11, high-low pressure steam mixer 13, pressure sensor 12 enters with thermic devices 15, by the steam condensate that flows out with thermic devices 15 through steam trap connection 16, condensate pipe 28,29,30 and condensate water import base 32,33,34 enter high-temperature condensate water recovery unit 17, through oil expeller 18 oil removings, tramp iron separator 19 deironing, copper-removing device 20 copper removals are after feed pump 21, the main stove 1 of economizer 23 inputs is finished whole circulation thus.
The superheated steam that enters back pressure type steam turbine generator 10 by secondary stove 4 outputs need have stable temperature, with the stability that guarantees that steam expands and does work in back pressure type steam turbine generator 10, in system, provide electric flow control valve 3 required control signals with temperature sensor 8, make electric flow control valve 3 open or close, regulation and control by electric flow control valve 3 enter the saturated vapor of high low temperature steam mixer 7 with by secondary stove 4 through auxiliary connection stove 4, the pipeline of high low temperature steam mixer 7 enters the superheated steam mixing ratio of high low temperature steam mixer 7, superheat steam temperature is regulated and control, provide combustion vapour electric flow control valve 22 required control signal with temperature sensor 6 simultaneously, combustion process to secondary stove 4 is regulated and control, use above-mentioned dual mode and combine the superheated steam output parameter is controlled, make it have back pressure type steam turbine generator 10 needed rated temperatures.
Provide electric flow control valve 11 required control signal with pressure sensor 12, extraction flow to back pressure type steam turbine generator 10 is regulated and control, and makes to have required rated pressure when entering with thermic devices 15 by steam heating house steward 14 after the exhaust tube of back pressure type steam turbine generator 10 and the vapor mixing that blast pipe enters high-low pressure steam mixer 13.
Establish threeway 24 on the superheated steam house steward 9; on the heating steam house steward 14 behind the pressure sensor 12, establish threeway 25; between above-mentioned threeway, establish the bypass pipe 27 that electronic control stop valve 26 is housed on it; when back pressure type steam turbine generator 10 maintenance outages; the electronic control stop valve of being located on the bypass pipe 27 26 is opened, thereby has guaranteed the normal heat supply of system.Used the condensed water in high temperature that flows out from steam trap connection to enter above-mentioned retracting device among the present invention, the condensate water that flows out from retracting device by various abatement processes after, send boiler back to through feed pump, so just the indirect backheat mode with original employing regenerator is transformed into method of direct regeneration, reduce investment, operation, the maintenance cost of heat regenerative system, and had good backheating function.
Owing to adopted the conjuncted frame mode of main stove 1 and secondary stove 4, only 5%～30% secondary stove combustion process is controlled, reduced furnace load greatly to the adverse effect of control system, simplified the control difficulty of system greatly, adopt temperature sensor 8 with electric flow control valve 3 and temperature sensor 6 and fire the interlock control mode that vapour electric flow control valve 22 combines, have control accuracy height, response speed is fast, control element is few, control system is rational in infrastructure advantage.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (4)
1, a kind of Industrial Boiler back pressure type electricity-generating method may further comprise the steps:
A, the main stove (1) of producing saturated vapor is set and accounts for the secondary stove (4) that 5%～30% in total amount of heat export ratio setting has required overheated saturated vapor heat capacity, main stove (1) is connected with pipeline with secondary stove (4) according to accounting for 70%～95% in the total amount of heat export ratio;
B, in the adapter between main stove (1) and the secondary stove (4), be provided with diversion three-way (2), be connected with diversion three-way (2) with bypass pipe (5) one ends which is provided with electric flow control valve (3), the other end is connected with high low temperature steam mixer (7), secondary stove (4) efferent duct is connected with high low temperature steam mixer (7), and in the adapter between high low temperature steam mixer (7) and the secondary stove (4), establish temperature sensor (6), connect high low temperature steam mixer (7) outlet and back pressure type steam turbine generator (10) import with superheated steam house steward (9), and go up the appropriate position superheated steam house steward (9) and establish temperature sensor (8), combustion vapour electric flow control valve (22) is located on secondary stove (4) fuel inlet tube;
C, employing have the back pressure type steam turbine generator (10) of single-stage or multistage air suction mode, on its pump-line, establish electric flow control valve (11), between its exhaust tube and outlet, establish high-low pressure steam mixer (13), make high-low pressure steam mixer (13) be positioned at electric flow control valve (11) afterwards, establish pressure sensor (12) on the heating steam house steward (14) behind the high-low pressure steam mixer (13), heating steam house steward (14) is connected behind pressure sensor (12) with thermic devices (15);
D, after with thermic devices (15), establish steam trap connection (16), between steam trap connection (16) and economizer (23), establish high-temperature condensate water recovery unit (17) with segmentation feedback system, behind high-temperature condensate water recovery unit (17), establish oil expeller (18), tramp iron separator (19), copper-removing device (20) successively, connect copper-removing device (20) outlet and feed pump (21) import with pipeline, at last feed pump (21) outlet is connected with pipeline with economizer (23) import, economizer (23) outlet is connected with boiler (1) admission port.
2, Industrial Boiler back pressure type electricity-generating method as claimed in claim 1, the set-up mode that it is characterized in that high-temperature condensate water recovery unit (17) is: with steam trap connection (16) outlet condensate pipe (28), (29), (30) respectively with high-temperature condensate water recovery unit (17) in condensate water import base (32) in the set jar (31), (33), (34) connect, indirect steam outlet base (35) in the set jar (31), make-up water import base (36) respectively with oxygen-eliminating device on air inlet pipe be connected with outlet pipe, with switch in the high-temperature condensate water recovery unit (17) on jar (37) and mutually pipe (38) be connected on the exhaust tube between electric flow control valve (11) and the high-low pressure steam mixer (13).
3, Industrial Boiler back pressure type electricity-generating method as claimed in claim 1 or 2, it is characterized in that: on superheated steam house steward (9), establish threeway (24), on the heating steam house steward (14) behind the pressure sensor (12), establish threeway (25), between threeway (24) and threeway (25), establish the bypass pipe (27) that electronic control stop valve (26) is housed on it.
4, Industrial Boiler back pressure type electricity-generating method as claimed in claim 3 is characterized in that: the main stove (1) of producing saturated vapor is set and accounts for the secondary stove (4) that 15%～25% in total amount of heat export ratio setting has required overheated saturated vapor heat capacity according to accounting for 75%～85% in the total amount of heat export ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100216483A CN1237307C (en) | 2004-01-08 | 2004-01-08 | Industrial boiler back pressure type electric generating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100216483A CN1237307C (en) | 2004-01-08 | 2004-01-08 | Industrial boiler back pressure type electric generating method |
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| Publication Number | Publication Date |
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| CN1556347A true CN1556347A (en) | 2004-12-22 |
| CN1237307C CN1237307C (en) | 2006-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100216483A Expired - Fee Related CN1237307C (en) | 2004-01-08 | 2004-01-08 | Industrial boiler back pressure type electric generating method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306757A (en) * | 2012-03-16 | 2013-09-18 | 茆其华 | Small-sized steam engine |
| CN103438430A (en) * | 2013-09-02 | 2013-12-11 | 苏州赛斯德工程设备有限公司 | Recovery system of condensation water |
| CN102149985B (en) * | 2008-11-13 | 2013-12-25 | 永日泵科技株式会社 | Apparatus for recovering vent steam and drain |
-
2004
- 2004-01-08 CN CNB2004100216483A patent/CN1237307C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102149985B (en) * | 2008-11-13 | 2013-12-25 | 永日泵科技株式会社 | Apparatus for recovering vent steam and drain |
| CN103306757A (en) * | 2012-03-16 | 2013-09-18 | 茆其华 | Small-sized steam engine |
| CN103438430A (en) * | 2013-09-02 | 2013-12-11 | 苏州赛斯德工程设备有限公司 | Recovery system of condensation water |
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| Publication number | Publication date |
|---|---|
| CN1237307C (en) | 2006-01-18 |
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