CN104006373A - Device and method for recycling afterheat of smoke of steam boiler - Google Patents
Device and method for recycling afterheat of smoke of steam boiler Download PDFInfo
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- CN104006373A CN104006373A CN201410235032.XA CN201410235032A CN104006373A CN 104006373 A CN104006373 A CN 104006373A CN 201410235032 A CN201410235032 A CN 201410235032A CN 104006373 A CN104006373 A CN 104006373A
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- flue gas
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Abstract
The invention relates to recycling of afterheat of smoke of a steam boiler, and in particular relates to a device and method for recycling the afterheat of the smoke of the steam boiler that varies frequently in load. The device comprises at least one buffering water tank (1); a discontinuous water supply inlet (11) is formed in one side of the bottom part of the buffering water tank (1); a continuous circulating cold water outlet (13) connected with one side of a circulating water pump (2) is formed in the other side of the bottom part of the buffering water tank (1); the other side of the circulating water pump (2) is connected with an inlet of a heat exchanger (3); an outlet of the heat exchanger (3) is connected with a continuous circulating hot water inlet (14) at the other side of the top part of the buffering water tank (1); a discontinuous water supply outlet (12) is formed in one side of the top part of the buffering water tank (1). With the adoption of the device for recycling the afterheat, the energy saving efficiency can be raised by more than 9% compared with that of the whole original system.
Description
Technical field
The present invention relates to steam boiler flue gas heat recovery, especially for load change steam boiler flue gas heat recovery device and heat recovery method frequently.
Background technology
In manufacturing enterprise, a large amount of industrial combustion gas boilers that adopt provide steam source, due to its flexible operation, the features such as simple to operate and strong adaptability, these industrial combustion gas boilers in actual applications can be according to the needs of production technology, cause start and stop and load variations situation comparatively frequently, and the unstable meeting of operating condition has influence on the variation of afterbody exhaust smoke level, also cause the variation of boiler feedwater speed simultaneously.The unstability of thermal source flow, has higher requirement to the design of the control method of flue gas waste heat recovery system and retracting device.
As a kind of to transform main heat recovery technology as, need guarantee can not cause obvious impact to original equipment and process before and after putting equipment in service, and can after breaking down, equipment switch timely or revert to original system, guarantee the normal operation of original system, therefore, reforming technology is preferably in to connect the method for arm bypass in original flue and draws boiler smoke, guarantee that flue gas suffered resistance in heat transmission equipment and pipeline is unlikely to larger than original flue and the resistance of ducting simultaneously, this requires there is strict demand in the design of heat exchanger resistance, otherwise there is " retardance " effect, even cause that burner hearth is when stopping burning, high-temperature flue gas residual in stove is via burner inlet, badly influence the safe operation of burner apparatus, be that appropriate design heat exchanger fume side resistance is also one of key parameter wherein, so not only can save the investment of the extra equipment such as increase air-introduced machine, can also simplification system form, the global reliability of raising system.
Consideration based on cost factor and convenience aspect, for a lot of small-sized gas fired-boilers, the heating of its deaerator feedwater often adopts Boiler Steam, this utilization ratio from energy is the cascade utilization principle that does not meet energy, exist the waste of high-grade energy, if adopt the lower fume afterheat of heat energy grade to heat deaerator feedwater, feedwater is risen to high as far as possible temperature by normal temperature, and (this is depending on exhaust gas temperature, conventionally be controlled at and be no more than 100 ℃), this just can greatly reduce and replaces original Boiler Steam heating process even completely, by the heating steam saving, realize the raising of entire system energy utilization rate, for the flue-gas temperature of object in prior art conventionally 200 ℃ of left and right, and feed temperature entrance is in 5 ~ 25 ℃ of left and right (depending on season), after heating, be warmed up to 95 ℃ of left and right, when inlet water temperature is lower, may there is the water vapour condensation in flue gas, can fully excavate the latent heat in flue gas, realize the maximization of energy utilization efficiency.
The adjustment of steam boiler load, can produce the fluctuation of flue-gas temperature, flow, and the variation of feedwater flow rate, because flue gas efflux time and feedwater time are not Complete Synchronizations, how better to dissolve energy discharge and soak time on contradiction, determined that to a great extent can this residual neat recovering system realize the maximization of its energy recovery efficiency.The feature that has certain fluctuation for system operating load, need research and development a kind of for load change frequently steam boiler flue gas waste heat recovery utilize method and device, to realize the high efficiente callback of the type system waste heat.
To sum up, in prior art, there are the several technical problems that need as follows solution: 1, residual neat recovering system can solve flue gas heat flow and feedwater calorific requirement asynchronous problem in time; 2, the flue resistance of heat exchanger is less than the drag overall of original chimney and flue; 3, by flue gas waste heat recovery, carry out heated feed water temperature, improve steam generator system capacity usage ratio; While 4, moving, do not affect existing equipment and technological process; 5, residual neat recovering system and original system can smooth and easyly switch; 6, residual neat recovering system structure and control logic are simple and reliable, and the maintenance of equipment easy care etc.
Summary of the invention
For the technical problem existing in above-mentioned prior art, requirement in conjunction with Practical Project and technique, the present invention proposes a kind of for the steam boiler flue gas heat recovery device and method in the frequent situation of load change, its objective is and be often subject to process requirements and while changing when boiler operatiopn load, how by the flue gas waste heat recovery of its discharge and offer and have equally flowed fluctuation, and nonsynchronous feedwater on the time, by improving heated feed water temperature, reduce the steam consumption of heated feed water, and then the efficiency of energy utilization of raising steam generator system, improve user's economic benefit, reach cost-saving, reduce the object of energy consumption.
To achieve these goals, the present invention proposes a kind of steam boiler flue gas heat recovery device, has taked following technical scheme:
A kind of gas fired-boiler flue gas heat recovery device, comprise at least one buffer tank 1, buffer tank 1 bottom one side is provided with discontinuity feed-water intake 11, buffer tank 1 bottom opposite side is provided with the continuous circulation cooling water outlet 13 being connected with water circulating pump 2 one sides, the opposite side of water circulating pump 2 connects heat exchanger 3 imports, heat exchanger 3 outlets connect the continuous circulation hot water inlet 14 of buffer tank 1 top opposite side, and buffer tank 1 top one side is provided with discontinuity to water out 12.
Further, described buffer tank 1 box house adopts diaphragm plate dislocation type synusia structure.The internal structure of buffer tank 1 is by parallel baffle 10, discontinuity feed-water intake 11, discontinuity is to water out 12, continuous circulation cooling water outlet 13, continuous circulation hot water inlet 14, casing 15, case feet 16, sewage draining exit 17, case feet base plate 18, relief valve connection 19 forms, and wherein parallel baffle 10 is the version settings that misplace.To guarantee that in buffer tank, water maintains obvious hot and cold water interface in flow process, reduce convection current and mixing between hot and cold water.
Further, described heat exchanger 3 is finned heat exchangers.
Further, described heat exchanger 3 one end connect the boiler back end ductwork 41 of existing equipment, other end connecting bypass flue 31.
Further, in above-mentioned boiler back end ductwork 41, be provided with the damper 42 of controlling flue gas circulation.
The present invention proposes a kind of steam boiler flue gas heat recovery method simultaneously, adopts, in waste heat recovery pipe-line system and original water supply network, buffer tank 1 is set, and solves flue gas heat and adds heat asynchronous technical problem in time with feedwater.
Further, adopt above-mentioned gas fired-boiler flue gas heat recovery device, normal temperature feedwater is provided with discontinuity feed-water intake 11 through buffer tank 1 bottom one side and enters buffer tank bottom, from the continuous circulation cooling water outlet 13 of buffer tank 1 bottom opposite side, by water circulating pump 2, enter heat exchanger 3 heat exchange, heat exchanger exit high-temperature tempering enters buffer tank 1 by the continuous circulation hot water inlet 14 of buffer tank 1 top opposite side, and the discontinuity that high-temperature water is provided with by buffer tank 1 top one side flows out to water out 12.Described heat exchanger 3 one end connect boiler back end ductwork 41, according to the variation of actual cycle water outlet temperature, adjust the frequency parameter of water circulating pump 2, realize and inhale heat release working medium energy Synchronization Control in time.
Further, the feedwater of described normal temperature from supply come water tank 6 through make-up pump 62, by buffer tank 1 bottom one side, be provided with discontinuity feed-water intake 11 and enter buffer tank bottom.
The present invention can reduce hot and cold water by buffer tank 1 and mix, and realizes the relatively stable of cold fluid and hot fluid interface, and the interfacial position that relatively moves of cold and hot working medium is controlled by water circulating pump 2 and the difference in flow of make-up pump 62.
Water circulating pump 2 rotational frequencies are by heat exchanger 3 outlet water temperature FEEDBACK CONTROL.
Further, the high-temperature water that the described discontinuity being provided with by buffer tank 1 top one side flows out to water out 12 passes into the oxygen-eliminating device 5 in original gas fired-boiler equipment through pipeline, by the external atmospheric pressure of pipeline tapping.Make-up pump 62 feedwater are subject to oxygen-eliminating device 5 liquid surface height controlling.Enter heating steam flow in oxygen-eliminating device steam pipework 51 and be subject to oxygen-eliminating device 5 water temperature FEEDBACK CONTROL.
The present invention can adjust water circulating pump frequency according to heat exchanger exit water temperature, to make full use of fume afterheat and to improve return water temperature, the buffer tank of employing diaphragm plate dislocation type synusia structure is realized effective layering of cold fluid and hot fluid working medium, and realize cold and hot working medium proportion in buffer tank by the movement of cold and hot interface, finally solve the asynchronous problem that cold and hot working medium is inhaled heat release.By this control system, fluctuation that not only can well the cold and hot working medium energy flux rate of balance, and the waste heat in the recovered flue gas of economical and efficient, reach saving fuel, reduces the object of energy consumption.
?
For water supply system loop, when feed pump is worked, the cold water pumping enters in buffer tank by bottom, extruding buffer tank top hot water enters oxygen-eliminating device, because hot and cold water layering is obvious, therefore enter the water temperature of oxygen-eliminating device, conventionally can be stabilized in higher temperature, specifically depending on confluent size and burning load (fluctuation within the scope of 75 ~ 98 ℃ conventionally), normal temperature feedwater when ratio does not adopt waste heat recovery has had obvious temperature rise, effectively reduce the consumption of Boiler Steam in oxygen-eliminating device, improve the utilization rate of steam resource, saved energy resources.
The present invention, using the height of heat exchanger circulating water temperature as feedback signal, adopts Frequency Converter Control water pump operation speed, regulates quantity of circulating water, guarantees that energy reclaims in time and fully.When exhaust gas volumn is larger, improve the frequency of water circulating pump, increase quantity of circulating water, by exchanger heat, exchange and be stored in the backwater that returns to buffer tank the energy in flue gas is as much as possible; And when exhaust gas volumn hour, by Frequency Converter Control, reduce pump operation frequency, reduce and enter the cooling working medium in heat exchanger, guarantee that heat exchanger exit return water temperature improves (being no more than in principle boiling point) as far as possible on the one hand, guarantee that exhaust gas temperature is low as far as possible simultaneously, in circulating water loop, the waste heat in recovered flue gas as much as possible all the time.
The present invention is not in order additionally to increase air-introduced machine or the blower equipment of system, take into full account the flue gas resistance of heat exchanger, so that can not producing obvious flue gas to existing equipment, the operation of new equipment discharges resistance, the impact of minimizing on original combustion parameter and operation process, simplify the structure of heat recovery system, improved security and the economy of system.
The present invention adopts spending road and in conjunction with the switch of damper, realizes the control of smoke gas flow, adopts fin tube type enhanced heat exchange technology to improve solution-air heat exchange efficiency.
The present invention has following beneficial effect:
(1) system meets fume afterheat and farthest reclaims by reduce smoke evacuation outlet temperature as far as possible, improves and enters the feed temperature in oxygen-eliminating device, is conducive to improve overall thermal economy and the energy use efficiency of steam generator system;
(2) system adopts the buffer tank with buffer storage ability, has solved hot working fluid and cold working medium and has inhaled the temporal asynchronous problem of heat release, and the ability that system adapts to varying duty and disturbance rejection strengthens greatly, and operational factor is more steady;
(3) by heat exchanger exit water temperature, as feedback signal, carry out the frequency of controlled circulation water pump, to guarantee Mist heat recovering as much as possible under the prerequisite of system safety operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of steam boiler flue gas heat recovery of the present invention method.
Fig. 2 is the schematic diagram of a kind of steam boiler flue gas heat recovery of the present invention device.
Fig. 3 is the buffer tank schematic diagram of a kind of steam boiler flue gas heat recovery of the present invention device.
In figure: 1 is buffer tank, 10 is parallel baffle, 11 is discontinuity feed-water intake, 12 is that discontinuity is to water out, 13 is continuous circulation cooling water outlet, 14 is continuous circulation hot water inlet, 15 casings, 16 casees feets, 17 sewage draining exits, 18 casees feet base plates, 19 relief valve connections, 2 is water circulating pump, 3 is heat exchanger, 31 is by-pass flue, 4 is gas fired-boiler, 41 is boiler back end ductwork, 42 is damper, 5 is oxygen-eliminating device, 51 for entering oxygen-eliminating device steam pipework, 52 for entering oxygen-eliminating device hot water pipeline, 53 is boiler feed pump, 6 is make-up water water tank, 61 carry out waterpipe for supply, 62 is make-up pump.
The specific embodiment
In conjunction with Fig. 1 and Fig. 2, technical scheme of the present invention is further described.
Original system comprises gas fired-boiler 4, the boiler back end ductwork 41 being communicated with, oxygen-eliminating device 5 and boiler feed pump 53, make-up water water tank 6, make-up pump 62.A kind of load change of the present invention frequently steam boiler flue gas heat recovery device schematic diagram as shown in Figure 2, comprise a buffer tank 1, buffer tank 1 bottom one side is provided with discontinuity feed-water intake 11, buffer tank 1 bottom opposite side is provided with the continuous circulation cooling water outlet 13 being connected with water circulating pump 2 one sides, the opposite side of water circulating pump 2 connects heat exchanger 3 imports, heat exchanger 3 outlets connect the continuous circulation hot water inlet 14 of buffer tank 1 top opposite side, and buffer tank 1 top one side is provided with discontinuity to water out 12.
Described heat exchanger 3 is finned heat exchangers, and one end connects the boiler back end ductwork 41 of existing equipment, other end connecting bypass flue 31.In boiler back end ductwork 41, be provided with the damper 42 of controlling flue gas circulation.
The feedwater of described normal temperature from supply come water tank 6 through make-up pump 62, by buffer tank 1 bottom one side, be provided with discontinuity feed-water intake 11 and enter buffer tank bottom.
The present invention can reduce hot and cold water by buffer tank 1 and mix, and realizes the relatively stable of cold fluid and hot fluid interface, and the interfacial position that relatively moves of cold and hot working medium is controlled by water circulating pump 2 and the difference in flow of make-up pump 62.According to the variation of actual flue gas heat flow, adjust the frequency parameter of water circulating pump 2, realize and inhale the asynchronous control in time of heat release working medium energy.
The by-pass flue 31 newly increasing is the branch road of original flue 41, in conjunction with damper 42, flue gas can be introduced to the by-pass flue that contains heat exchanger and carry out heat exchange, and when existing equipment breaks down, damper 42 is opened, can realize and steadily be switched to original smoke evacuation system, can not cause extra impact.Heat exchanger is comprised of fin tube type air water heat exchange unit, in order to realize making full use of fume afterheat, native system passes through the temperature of heat exchanger exit water as feedback signal, and regulate the rotational frequency of water circulating pump 2 to carry out the discharge in controlled circulation loop by frequency converter, through heat exchanger high-temperature-hot-water out, pass into the upper end of buffer tank 1, water tank upper end opposite side is connected with oxygen-eliminating device 5 entrances by pipeline, Boiler Steam consumption is controlled via the feedback signal of oxygen-eliminating device water temperature, and the water after deoxygenation enters boiler by feed pump 53 again and produces steam.
For water circulating pump 2, its operation is mainly controlled by two feedback parameters, i.e. heat exchanger exit water temperature and exhanst gas outlet temperature.When water temperature raises or surpass full level alarm value, the rotational frequency that control system can improve water circulating pump by frequency converter increases the supply of quantity of circulating water, thereby avoid exporting water temperature over-high, when outlet water temperature is on the low side, by turning down water circulating pump 2 rotational frequencies, reduce quantity of circulating water; Equally, when flue-gas temperature is higher, when guaranteeing that heat exchanger exit water temperature is no more than limit value, by improving quantity of circulating water, realize the decline of exhaust gas temperature, to realize the maximization of waste heat recovery energy.At these two kinds, control in parameter; preferentially select heat exchanger exit water temperature parameter to control; to guarantee the safe and stable operation of recovery system; on this basis; make full use of waste heat; reduce outlet cigarette temperature, improve the recycled in its entirety efficiency of fume afterheat, and guarantee that outlet water temperature can be stabilized in a relatively little scope.
Concerning buffer tank 1, when make-up pump 62 is opened moisturizing, normal temperature cold water can enter by buffer tank 1 bottom, and it is mobile to oxygen-eliminating device 5 to push water tank upper end hot water, this process shows as cold water and enters buffer tank 1, and the hot water being stored in water tank upper end enters oxygen-eliminating device 5; And no matter whether there is moisturizing, the cold water entering in buffer tank 1 all can heat via water circulating pump 2 importing heat exchangers 3, produce hot water and be stored in buffer tank 1 upper end, in fact by the interfacial balance that moves up and down to realize energy in input and output procedure of hot and cold water in buffer tank 1.
Flue gas waste heat recovery system device of the present invention
?be applied to certain enterprises of producing stainless steel, the said firm has two capacity to be respectively the gas fired-boiler of 4 tons/hour and 6 tons/hour, before transformation, its smog discharge temperature is 200 ~ 220 ℃, and entering deaerator feedwater temperature is normal temperature, and be about 8 ton/day for the quantity of steam that heats deaerator feedwater and consume every day.After transformation, approximately 40 ℃ of heat exchanger exhanst gas outlet exhaust gas temperatures, deaerator feedwater temperature is elevated to 80 ℃ of left and right, and has closed steam-heated electrically operated valve completely, and residual neat recovering system has reached 9.3% to whole energy efficiency, has obtained obvious economic benefit.
The degree of depth that the present invention is mainly used in fume afterheat in gas fired-boiler reclaims, and load change is frequent and the correlative technology field of discontinuity feedwater.
Claims (15)
1. a gas fired-boiler flue gas heat recovery device, it is characterized in that, comprise at least one buffer tank (1), buffer tank (1) bottom one side is provided with discontinuity feed-water intake (11), buffer tank (1) bottom opposite side is provided with the continuous circulation cooling water outlet (13) being connected with water circulating pump (2) one sides, the opposite side of water circulating pump (2) connects heat exchanger (3) import, heat exchanger (3) outlet connects the continuous circulation hot water inlet (14) of buffer tank (1) top opposite side, buffer tank (1) top one side is provided with discontinuity to water out (12).
2. a kind of gas fired-boiler flue gas heat recovery device according to claim 1, is characterized in that, described buffer tank (1) box house adopts diaphragm plate dislocation type synusia structure.
3. a kind of gas fired-boiler flue gas heat recovery device according to claim 1, is characterized in that, described heat exchanger (3) is finned heat exchanger.
4. a kind of gas fired-boiler flue gas heat recovery device according to claim 1, is characterized in that, described heat exchanger (3) one end connects the boiler back end ductwork (41) of existing equipment, other end connecting bypass flue (31).
5. a kind of gas fired-boiler flue gas heat recovery device according to claim 4, is characterized in that, is provided with the damper (42) of controlling flue gas circulation in described boiler back end ductwork (41).
6. a steam boiler flue gas heat recovery method, adopt gas fired-boiler flue gas heat recovery device as claimed in claim 1, normal temperature feedwater is provided with discontinuity feed-water intake (11) through buffer tank (1) bottom one side and enters buffer tank bottom, from the continuous circulation cooling water outlet (13) of buffer tank (1) bottom opposite side, by water circulating pump (2), enter heat exchanger (3) heat exchange, heat exchanger exit high-temperature tempering enters buffer tank (1) by the continuous circulation hot water inlet (14) of buffer tank (1) top opposite side, the discontinuity that high-temperature water is provided with by buffer tank (1) top one side flows out to water out (12).
7. a kind of steam boiler flue gas heat recovery method according to claim 6, it is characterized in that, the feedwater of described normal temperature is from extra feed tank (6), through make-up pump, be provided with discontinuity feed-water intake (11) by a side bottom buffer tank (1) and enter buffer tank bottom.
8. a kind of steam boiler flue gas heat recovery method according to claim 6, is characterized in that, the interfacial position that relatively moves of cold and hot working medium is controlled by water circulating pump (2) and the difference in flow of make-up pump (62).
9. a kind of steam boiler flue gas heat recovery method according to claim 8, is characterized in that, water circulating pump (2) rotational frequency is by heat exchanger (3) outlet water temperature FEEDBACK CONTROL.
10. a kind of steam boiler flue gas heat recovery method according to claim 6, it is characterized in that, the high-temperature water that the described discontinuity being provided with by buffer tank (1) top one side flows out to water out (12) passes into the oxygen-eliminating device (5) in original boiler plant through pipeline, by the external atmospheric pressure of pipeline tapping.
11. a kind of steam boiler flue gas heat recovery methods according to claim 8, is characterized in that, described make-up pump (62) feedwater is subject to oxygen-eliminating device (5) liquid surface height controlling.
12. a kind of steam boiler flue gas heat recovery methods according to claim 11, is characterized in that, enter heating steam flow in oxygen-eliminating device steam pipework (51) and are subject to oxygen-eliminating device (5) water temperature FEEDBACK CONTROL.
13. a kind of steam boiler flue gas heat recovery methods according to claim 6, it is characterized in that, when make-up pump (62) is worked, the cold water pumping enters in buffer tank (1) by bottom, and extruding buffer tank top hot water enters oxygen-eliminating device (5).
14. a kind of steam boiler flue gas heat recovery methods according to claim 6, it is characterized in that, using the height of heat exchanger circulating water temperature as feedback signal, adopt Frequency Converter Control water pump operation speed, regulate quantity of circulating water, guarantee that energy reclaims in time and fully.
15. a kind of steam boiler flue gas heat recovery methods according to claim 6, it is characterized in that, when exhaust gas volumn is larger, improve the frequency of water circulating pump, increase quantity of circulating water, by exchanger heat, exchange and be stored in the backwater that returns to buffer tank the energy in flue gas is as much as possible; When exhaust gas volumn hour, by Frequency Converter Control, reduces pump operation frequency, minimizing enters the cooling working medium in heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410235032.XA CN104006373A (en) | 2014-05-30 | 2014-05-30 | Device and method for recycling afterheat of smoke of steam boiler |
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| CN201410235032.XA CN104006373A (en) | 2014-05-30 | 2014-05-30 | Device and method for recycling afterheat of smoke of steam boiler |
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| HUT37245A (en) * | 1984-04-13 | 1985-11-28 | Energiagazdalkodasi Intezet | Energy-space connection arrangement for degassing of partial current of heating network |
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| CN102087024A (en) * | 2011-03-08 | 2011-06-08 | 北京交通大学 | Energy saving device for circulating fluidized bed boiler |
| CN202647714U (en) * | 2012-06-15 | 2013-01-02 | 上海义理节能科技发展有限公司 | Boiler economizer system |
| CN202947121U (en) * | 2012-10-18 | 2013-05-22 | 如皋市大生线路器材有限公司 | Heat cycling device using flue residual heat |
| CN203963906U (en) * | 2014-05-30 | 2014-11-26 | 上海汇闵能源科技有限公司 | A kind of steam boiler flue gas heat recovery device |
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2014
- 2014-05-30 CN CN201410235032.XA patent/CN104006373A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HUT37245A (en) * | 1984-04-13 | 1985-11-28 | Energiagazdalkodasi Intezet | Energy-space connection arrangement for degassing of partial current of heating network |
| CN101774716A (en) * | 2010-01-15 | 2010-07-14 | 陕西大唐节能科技有限公司 | Water treatment method and device using aluminum oxide secondary condensation water as make-up water of power plant |
| CN102087024A (en) * | 2011-03-08 | 2011-06-08 | 北京交通大学 | Energy saving device for circulating fluidized bed boiler |
| CN202647714U (en) * | 2012-06-15 | 2013-01-02 | 上海义理节能科技发展有限公司 | Boiler economizer system |
| CN202947121U (en) * | 2012-10-18 | 2013-05-22 | 如皋市大生线路器材有限公司 | Heat cycling device using flue residual heat |
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Application publication date: 20140827 |