CN203731363U - Durable dew-blockage preventive combined smoke waste heat utilizing device - Google Patents
Durable dew-blockage preventive combined smoke waste heat utilizing device Download PDFInfo
- Publication number
- CN203731363U CN203731363U CN201420080126.XU CN201420080126U CN203731363U CN 203731363 U CN203731363 U CN 203731363U CN 201420080126 U CN201420080126 U CN 201420080126U CN 203731363 U CN203731363 U CN 203731363U
- Authority
- CN
- China
- Prior art keywords
- heat
- pipe
- outlet
- conduction oil
- conductive oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model discloses a durable dew-blockage preventive combined smoke waste heat utilizing device comprises a heat conduction oil sleeve type heat tube exchanger, a tubular heat exchanger, a heat conduction oil pump, a steam manifold and an expansion groove, the expansion groove is provided with two inlets and an outlet, the heat conduction oil sleeve type heat tube exchanger is provided with a heat conduction oil outlet connected with a heat conduction oil inlet of the tubular heat exchanger via a heat conduction oil pipeline, the tubular heat exchanger is provided with a heat conduction oil outlet connected with the first inlet of the expansion groove via the heat conduction oil pipeline, and the outlet of the expansion groove is connected with a heat conduction oil inlet of the heat conduction oil sleeve type heat tube exchanger. A heat conduction oil bypass pipe is connected between the front end of the heat conduction oil inlet of the tubular heat exchanger and the second inlet of the expansion, the steam manifold is provided with a cooling water outlet II connected with a cooling water inlet I of the tubular heat exchanger, the tubular heat exchanger is provided with a steam outlet I connected with a steam inlet II of the steam manifold, and the manifold is provided with a steam outlet supplying steam for users.
Description
Technical field
The utility model belongs to residual heat using device, specifically the stifled assembled smoke gas residual heat using device of a kind of durable anti-dew.
Background technology
In service in factory, can produce a large amount of middle high-temperature dust-containing flue gas, in flue gas, contain a large amount of sensible heats.For reducing energy consumption, realize optimizing network resource utilization, meet Air Pollutant Emission requirement simultaneously, conventionally adopt residual neat recovering system to carry out Mist heat recovering, produce steam or hot water and meet the demands of production and living.
Heat exchanger in existing domestic residual neat recovering system is substantially taking finned tube or heat-pipe heat exchanger as main.In the time reclaiming the middle high-temperature flue gas of high dust-laden, high sulfur-bearing, the dew-point temperature of flue gas is generally higher, can reach more than 200 DEG C, under the working condition that especially sulfur content is higher in flue gas.If adopt general water tube type heat exchanging device, more than the wall surface temperature of very difficult guarantee heat exchanger tube remains at dew-point temperature.Open when worst cold case or at device, shutdown phase, still can there is on heat exchanger tube surface dew point corrosion, once reveal, in pipe, working media (water or conduction oil) is revealed in a large number in flue, causes stopping production and the irreversible damage of equipment.If adopt general jacket pipe heat pipe heat exchanging pipe, for ensureing that wall surface temperature is higher than dew-point temperature, need to improve the saturation temperature of cold side water, need greatly to improve the operating pressure of cold side water, along with the raising of cold side water pressure, cause equipment in running, to have the danger of HTHP booster, and investment is larger, water produced steam parameter may not mate with plant area's customer parameter.Brought very large difficulty therefore to the recovery of this class flue gas, this problem becomes increasingly conspicuous.
As: in Producing Titanium Dioxide process, calcination process can produce a large amount of tail flue gas, and its smoke characteristic is: sulfureous in flue gas content is large (0.2%-1%), water content very high (15%-35%), flue-gas temperature is between 250-400 DEG C.The dew-point temperature of this type of flue gas is conventionally at 200-260 DEG C.Reclaiming in the process of this type of flue gas heat, be easy to occur the situation of corrosion, bring a very large difficult problem to off-gas recovery.
The flue gas waste heat recovery technique of the sector has three kinds at present, as described below:
1. watertube boiler: the boiler of this structure adopts common finned tube to carry out waste heat recovery, hot side flue gas is walked outside pipe, and the medium of cold side adopts water, in heat exchanger tube internal flow, carries out heat exchange by heat exchanger tube and flue gas.But for ensureing heating surface temperature, vapour-water lateral pressure very high (260 DEG C of corresponding water saturation pressure are ~ 4.7Mpa).Secondly the boiler of this structural shape cannot ensure that heat exchanger tube outside wall surface temperature is all the time higher than dew-point temperature, and therefore equipment moves soon, will there is heat exchanger tube and be corroded, and the phenomenons such as perforation, in pipe, medium is revealed in a large number in flue, causes the heavy losses such as stopping production.
2., can there is not the situation of leaking in hydro-thermal tubular boiler: the advantage that this structure boiler is gone up a kind of boiler is relatively: cold and hot side medium is isolated completely.But a difficult problem for this type of boiler is, for ensureing that wall surface temperature, higher than dew-point temperature, need to improve the saturation temperature of cold side medium (water) as far as possible, improves the pressure of water in cold side sleeve pipe.When pressure improves, make the state of heat pipe in HTHP, empirical tests, in situation, heat pipe can be in the edge of booster, has greatly improved the danger of heat pipe booster mostly, and reduces the service life of heat pipe.If reduce the saturation temperature of cold side medium (water), wall surface temperature cannot ensure higher than dew-point temperature; In practice, have three cover heat pipe waste heat boilers, cold side operating pressure is chosen for 1.6Mpa(G), 201 DEG C, use and after 3 months, all lose heat exchange effect.
3. conduction oil fin tube type boiler: the relative the first type of this type of boiler boiler is that cold side medium is become to conduction oil from water.Its advantage is under worst cold case, the conduction oil of heat can heat exchanger tube in iterative cycles, thereby control wall surface temperature 10-20 DEG C on dew-point temperature, can effectively avoid the generation of cold end corrosion situation.Meanwhile, again without adopting very high pressure, equipment can be under lower pressure long-play.Although this type of boiler is the heat in recovered flue gas effectively, still have possibility of leaking occurs, once cold side conduction oil directly contacts with hot side flue gas generation, there is the danger of blasting at any time, cause the loss of personnel and property, there is larger potential safety hazard.
Utility model content
Technical problem to be solved in the utility model is:
How to avoid Water Heat Pipes booster or use unsettled high pressure heat pipe;
How can effectively control heat pipe wall surface temperature, to prevent the generation of cold end corrosion;
How effectively to avoid dust in flue gas to form the phenomenon of stopping up tube lane at heat pipe surface aggregation;
In order to solve above technical problem, the utility model proposes the stifled assembled smoke gas residual heat using device of a kind of durable anti-dew, concrete technical scheme is:
For the shortcoming of above prior art, the stifled assembled smoke gas residual heat using device of a kind of durable anti-dew is proposed, can efficiently solve the problem that cold end corrosion or heat pipe booster occur in long-play process equipment in these cases, avoid because the dust accumulation in flue gas is on heat pipe wall, cause heat pipe obstruction etc., effectively the service life of extension device, enhance productivity.
The technical solution of the utility model realizes by the following method: the stifled assembled smoke gas residual heat using device of a kind of durable anti-dew, comprise heat conductive oil bushing formula heat exchange of heat pipe, pipe heat exchanger, Heat-transfer Oil Pump, drum and expansion slot, expansion slot is provided with two imports and an outlet, the conduction oil that heat conductive oil bushing formula heat exchange of heat pipe has exports the heat conductive oil inlet having with pipe heat exchanger by thermal conductive oil pipeline and is connected, the conduction oil outlet that pipe heat exchanger has is connected with the first import of expansion slot by thermal conductive oil pipeline, the outlet of expansion slot by be provided with that Heat-transfer Oil Pump has with heat conductive oil bushing formula heat exchange of heat pipe heat conductive oil inlet be connected,
Between the second import of the front end of the heat conductive oil inlet of pipe heat exchanger and expansion slot, be connected with a conduction oil shunt valve, at the conduction oil import and export of conduction oil shunt valve and pipe heat exchanger, corresponding valve be all set;
The cooling water inlet I that the coolant outlet II that drum has has with pipe heat exchanger by decline pipeline is connected, the steam import II that the steam outlet I that pipe heat exchanger has has with drum by increase in pipeline is connected, and the steam (vapor) outlet that drum has will produce steam supply user; The gas approach that flue gas has from described heat conductive oil bushing formula heat exchange of heat pipe enters, in heat conductive oil bushing formula heat exchange of heat pipe with heat-pipe working medium generation countercurrent flow after the exhanst gas outlet that had by it discharge.
The technical program adopts oil as working media, can make equipment (200-280 DEG C) energy low pressure operation in deep fat operating temperature, has therefore avoided Water Heat Pipes booster or has used unsettled high pressure heat pipe.
What the utility model was scientific and reasonable arranges a bypass between pipe heat exchanger and expansion slot import, can be by regulating the flow that enters conduction oil in pipe heat exchanger in the valve controlled circulation pipeline in bypass, thereby the conduction oil inlet temperature that can avoid getting back to heat conductive oil bushing formula heat exchange of heat pipe is too low, can effectively control heat pipe wall surface temperature, prevent the generation of cold end corrosion; In addition, by effective control heat pipe wall surface temperature, prevent flue gas low-temperature dewfall, thereby effectively avoid in flue gas dust at heat pipe surface aggregation, form the phenomenon of stopping up tube lane, guarantee equipment can the stable operation of long-term safety; Kill two birds with one stone.
The technical scheme that the utility model further limits is:
Aforesaid durable anti-dew blocks up assembled smoke gas residual heat using device, in heat conductive oil bushing formula heat exchange of heat pipe, be provided with heat pipe perpendicular to horizontal plane direction, relevant position, heat pipe upper end is arranged with sleeve pipe, and part, heat pipe upper end is stretched in sleeve pipe, sleeve pipe lower end horizontal direction is provided with heat conductive oil inlet I, sleeve pipe upper end horizontal direction is provided with conduction oil outlet I, between heat pipe and sleeve pipe, is provided with sealing baffle, and sealing baffle lower horizontal direction is also provided with gas approach and exhanst gas outlet.
Aforesaid durable anti-dew blocks up assembled smoke gas residual heat using device, and gas approach and the exhanst gas outlet of heat conductive oil bushing formula heat exchange of heat pipe lower end are also respectively equipped with temperature probe.
The beneficial effects of the utility model are:
The technical program adopts oil as working media, can make equipment (200-400 DEG C) energy low pressure operation in deep fat operating temperature, has therefore avoided Water Heat Pipes booster or has used unsettled high pressure heat pipe; Adopt the hot and cold side medium of bushing-type heat tube heat exchanger separate mobile, centre has sealing baffle to shut, even in the situation that heat pipe occurs to leak, also can avoid hot and cold side medium directly to contact; And at pipe heat exchanger and expansion slot import, one branch road is set, and branch road is provided with valve, can be by regulating the flow that enters conduction oil in pipe heat exchanger in the valve controlled circulation pipeline on branch road, thereby the conduction oil inlet temperature that can avoid getting back to heat conductive oil bushing formula heat exchange of heat pipe is too low, can effectively control heat pipe wall surface temperature, prevent the generation of cold end corrosion.
The utility model, by effectively controlling heat pipe wall surface temperature, prevents flue gas low-temperature dewfall, thereby effectively avoids dust in flue gas at heat pipe surface aggregation, to form the phenomenon of stopping up tube lane, and guarantee equipment can the stable operation of long-term safety.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of heat conductive oil bushing formula heat exchange of heat pipe.
Wherein: 1-heat conductive oil bushing formula heat exchange of heat pipe, 2-pipe heat exchanger, 3-Heat-transfer Oil Pump, 4-drum, 5-expansion slot, 6-decline pipeline, 7-increase in pipeline, 8-valve, 101-gas approach, 102-exhanst gas outlet, 103-heat conductive oil inlet I, 104-conduction oil outlet I, 105-heat pipe, 106-sleeve pipe, 107-sealing baffle, 201-heat conductive oil inlet II, 202-conduction oil outlet II, 203-cooling water inlet I, 204-steam outlet I, 401-coolant outlet II, 402-steam import II, 403-steam (vapor) outlet.
Detailed description of the invention
Below the utility model is described in further detail:
embodiment 1
As shown in the figure, the present embodiment provides a kind of durable anti-dew stifled assembled smoke gas residual heat using device, comprise heat conductive oil bushing formula heat exchange of heat pipe 1, pipe heat exchanger 2, Heat-transfer Oil Pump 3, drum 4 and expansion slot 5, heat conductive oil bushing formula heat exchange of heat pipe 1 lower end is provided with gas approach 101 and exhanst gas outlet 102, heat conductive oil bushing formula heat exchange of heat pipe 1 upper end is provided with heat conductive oil inlet I 103 and conduction oil outlet I 104, heat conductive oil inlet I 103 is connected with the outlet of Heat-transfer Oil Pump 3, and the import of Heat-transfer Oil Pump 3 is connected with the outlet of expansion slot 5.
Pipe heat exchanger 2 is divided into hot side and cold survey, the hot side of pipe heat exchanger 2 is provided with heat conductive oil inlet II 201 and conduction oil outlet II 202, pipe heat exchanger 2 cold sides are provided with cooling water inlet I 203 and steam outlet I 204, conduction oil outlet I 104 is connected with the first import of expansion slot 5 and the heat conductive oil inlet II 201 of pipe heat exchanger 2 respectively, and the branch road forming between conduction oil outlet I 104 and the first import of expansion slot 5 is provided with valve 8, conduction oil outlet II 202 is connected with the second import of expansion slot 5, the hot side of pipe heat exchanger 2 and cold survey working media are respectively: You Heshui.
Drum 4 is provided with coolant outlet II 401, steam import II 402 and steam (vapor) outlet 403, coolant outlet II 401 is connected with cooling water inlet I 203 by decline pipeline 6, steam (vapor) outlet 403 is connected with steam outlet I 204 by increase in pipeline 7, steam (vapor) outlet 403 is connected with external system, and gas approach 101 and the exhanst gas outlet 102 of heat conductive oil bushing formula heat exchange of heat pipe 1 lower end are also respectively equipped with temperature probe.
The course of work of the present embodiment is: high dust-laden, the middle high-temperature flue gas of high sulfur-bearing is by after heat conductive oil bushing formula heat exchange of heat pipe 1, in the mode handle of logical heat transfer, high-temperature flue gas heat passes to the oil in pipe heat exchanger 2, after raising, oil temperature heat is passed to the water in drum 4 in the mode of logical heat transfer, coolant-temperature gage raises, become steam, steam flow in drum 4 by increase in pipeline 7, steam in drum 4 is delivered to user by steam (vapor) outlet 403 steam, the oil being simultaneously cooled flows in expansion slot 5, by Heat-transfer Oil Pump 3, the oil of low temperature is evacuated to ramp cycle in heat conductive oil bushing formula heat exchange of heat pipe 1, control oily flow and oil temperature by by-pass valve control 8, and the water in drum 4 flow to the continuous ramp cycle of pipe heat exchanger 2 relayings by decline pipeline 6.
embodiment 2
The present embodiment is for Producing Titanium Dioxide process, can produce a large amount of tail flue gas to calcination process recycles, the present embodiment adopts the equipment identical with embodiment 1, and calcination process produces the gas approach 101 that a large amount of tail flue gas has from heat conductive oil bushing formula heat exchange of heat pipe 1 and enters, in heat conductive oil bushing formula heat exchange of heat pipe 1 with heat-pipe working medium generation countercurrent flow after the exhanst gas outlet 102 that had by it discharge.
The course of work of the present embodiment is: calcination process produces a large amount of tail flue gas by after heat conductive oil bushing formula heat exchange of heat pipe 1, in the mode handle of logical heat transfer, high-temperature flue gas heat passes to the oil in pipe heat exchanger 2, after raising, oil temperature heat is passed to the water in drum 4 in the mode of logical heat transfer, coolant-temperature gage raises, become steam, steam flow in drum 4 by increase in pipeline 7, steam in drum 4 is delivered to user by steam (vapor) outlet 403 steam, the oil being simultaneously cooled flows in expansion slot 5, by Heat-transfer Oil Pump 3, the oil of low temperature is evacuated to ramp cycle in heat conductive oil bushing formula heat exchange of heat pipe 1, control oily flow and oil temperature by by-pass valve control 8, and the water in drum 4 flow to the continuous ramp cycle of pipe heat exchanger 2 relayings by decline pipeline 6
.
Like this, embodiment adopts heat conductive oil bushing formula heat exchange of heat pipe, stoped cold side working medium to contact with hot side waste gas, avoided cold side working medium in flue a large amount of reveal may, ensured that waste-heat recovery device can not impact main explained hereafter; Adopt conduction oil, more than can ensureing that under lower pressure heat-transfer surface temperature maintains dew-point temperature, ensured use safety and the service life of heat pipe equipment; Under worst cold case, the conduction oil of heat can heat exchanger tube in iterative cycles, thereby control wall surface temperature 10-20 DEG C on dew-point temperature, can effectively avoid the generation of cold end corrosion situation.
So the present embodiment can efficiently solve the problem that cold end corrosion or heat pipe booster occur in equipment long-play process, avoid, because the dust accumulation in flue gas is on heat pipe wall, causing heat pipe obstruction etc., the effectively service life of extension device, easy for installation, safeguard simply, enhance productivity.
Above embodiment is only explanation technological thought of the present utility model; can not limit protection domain of the present utility model with this; every technological thought according to the utility model proposes, any change of doing on technical scheme basis, within all falling into the utility model protection domain.
Claims (3)
1. the stifled assembled smoke gas residual heat using device of durable anti-dew, comprise heat conductive oil bushing formula heat exchange of heat pipe (1), pipe heat exchanger (2), Heat-transfer Oil Pump (3), drum (4) and expansion slot (5), described expansion slot (5) is provided with two imports and an outlet, it is characterized in that: the conduction oil outlet that described heat conductive oil bushing formula heat exchange of heat pipe (1) has is connected with the heat conductive oil inlet that pipe heat exchanger (2) has by thermal conductive oil pipeline, the conduction oil outlet that described pipe heat exchanger (2) has is connected with the first import of described expansion slot (5) by thermal conductive oil pipeline, the outlet of described expansion slot (5) by be provided with that Heat-transfer Oil Pump (3) has with described heat conductive oil bushing formula heat exchange of heat pipe (1) heat conductive oil inlet be connected,
Between the second import of the front end of the heat conductive oil inlet of described pipe heat exchanger (2) and described expansion slot (5), be connected with a conduction oil shunt valve, at the conduction oil import and export of described conduction oil shunt valve and described pipe heat exchanger (2), corresponding valve be all set;
The cooling water inlet I (203) that the coolant outlet II (401) that described drum (4) has has with described pipe heat exchanger (2) by decline pipeline (6) is connected, the steam import II (402) that the steam outlet I (204) that described pipe heat exchanger (2) has has with described drum (4) by increase in pipeline (7) is connected, and the steam (vapor) outlet (403) that described drum (4) has will produce steam supply user; The gas approach (101) that flue gas has from described heat conductive oil bushing formula heat exchange of heat pipe (1) enters, and the exhanst gas outlet (102) being had by it in heat conductive oil bushing formula heat exchange of heat pipe (1) and after heat-pipe working medium generation countercurrent flow is discharged.
2. the stifled assembled smoke gas residual heat using device of durable anti-dew as claimed in claim 1, it is characterized in that: in described heat conductive oil bushing formula heat exchange of heat pipe (1), be provided with heat pipe (105) perpendicular to horizontal plane direction, described heat pipe (105) relevant position, upper end is arranged with sleeve pipe (106), and heat pipe (105) part, upper end is stretched in sleeve pipe (106), described sleeve pipe (106) lower end horizontal direction is provided with heat conductive oil inlet I (103), described sleeve pipe (106) upper end horizontal direction is provided with conduction oil outlet I (104), between described heat pipe (105) and sleeve pipe (106), be provided with sealing baffle (107), described sealing baffle (107) lower horizontal direction is also provided with gas approach (101) and exhanst gas outlet (102).
3. the stifled assembled smoke gas residual heat using device of durable anti-dew as claimed in claim 1, is characterized in that: gas approach (101) and the exhanst gas outlet (102) of described heat conductive oil bushing formula heat exchange of heat pipe (1) lower end are also respectively equipped with temperature probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420080126.XU CN203731363U (en) | 2014-02-25 | 2014-02-25 | Durable dew-blockage preventive combined smoke waste heat utilizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420080126.XU CN203731363U (en) | 2014-02-25 | 2014-02-25 | Durable dew-blockage preventive combined smoke waste heat utilizing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203731363U true CN203731363U (en) | 2014-07-23 |
Family
ID=51201432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420080126.XU Withdrawn - After Issue CN203731363U (en) | 2014-02-25 | 2014-02-25 | Durable dew-blockage preventive combined smoke waste heat utilizing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203731363U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791477A (en) * | 2014-02-25 | 2014-05-14 | 江苏智道工程技术有限公司 | Durable dew-blocking-prevention combined-type exhaust gas waste heat utilization device |
| CN109443016A (en) * | 2018-09-28 | 2019-03-08 | 山东理工大学 | A kind of gradient utilization system of titanium dioxide calcining rotary kiln waste heat from tail gas |
-
2014
- 2014-02-25 CN CN201420080126.XU patent/CN203731363U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791477A (en) * | 2014-02-25 | 2014-05-14 | 江苏智道工程技术有限公司 | Durable dew-blocking-prevention combined-type exhaust gas waste heat utilization device |
| CN103791477B (en) * | 2014-02-25 | 2015-07-15 | 江苏智道工程技术有限公司 | Durable dew-blocking-prevention combined-type exhaust gas waste heat utilization device |
| CN109443016A (en) * | 2018-09-28 | 2019-03-08 | 山东理工大学 | A kind of gradient utilization system of titanium dioxide calcining rotary kiln waste heat from tail gas |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203323218U (en) | Boiler flue gas waste heat heating system | |
| CN103791477B (en) | Durable dew-blocking-prevention combined-type exhaust gas waste heat utilization device | |
| CN105135468A (en) | Smoke waste heat utilization system | |
| CN203731363U (en) | Durable dew-blockage preventive combined smoke waste heat utilizing device | |
| CN203489244U (en) | Boiler smoke waste-heat applicable system | |
| CN205036418U (en) | Industry waste heat recovery of cogeneration of heat and power utilizes system | |
| CN204005923U (en) | A kind of boiler waste heat recovery system | |
| CN204372879U (en) | A kind of two medium waste heat boiler | |
| CN103256716B (en) | Method and device for recovering retention heat of gas heating water heater | |
| CN202808950U (en) | Cold-rolling titanium belt degreasing process device | |
| CN204806364U (en) | Boiler feed water subtracts warm economizer | |
| CN104234763A (en) | Organic Rankine cycle system recovering waste heat through heat pipe technology | |
| CN204806365U (en) | Add energy -saving boiler that is equipped with water -cooled boiler feed water reducing temperature equipment | |
| CN104100957B (en) | A kind of boiler waste heat recovery system | |
| CN104235827A (en) | Boiler smoke waste heat utilization system | |
| CN203718810U (en) | Smoke waste heat depth recycle device | |
| CN202902241U (en) | Zinc coated thermal treatment furnace heat recovery boiler | |
| CN202532445U (en) | High-efficiency anti-blocking superheater of waste heat boiler | |
| CN205245810U (en) | Burning furnace smoke waste heat's device is forged in recovery | |
| CN204806366U (en) | Install air -cooled boiler feed water reducing temperature equipment's energy -saving boiler additional | |
| CN203116054U (en) | Cooling device used for flue gas heat exchanging | |
| CN203704359U (en) | Waste-heat utilization device for boiler in oil production line | |
| CN203413988U (en) | 180-degree shell-tube type heat exchanging unit and 180-degree shell-tube type heat exchanging device for gathering, transportation and heat tracing of oil field | |
| CN203785470U (en) | Waste heat utilization device for lime kiln | |
| CN203704686U (en) | Off-gas sensible heat recovery device for metallurgical off-gas acid making device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140723 Effective date of abandoning: 20150715 |
|
| RGAV | Abandon patent right to avoid regrant |