CN103776168A - Flue gas efficiently-condensing and waste heat recovery system device and method of gas-fired boiler - Google Patents
Flue gas efficiently-condensing and waste heat recovery system device and method of gas-fired boiler Download PDFInfo
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- CN103776168A CN103776168A CN201210401289.9A CN201210401289A CN103776168A CN 103776168 A CN103776168 A CN 103776168A CN 201210401289 A CN201210401289 A CN 201210401289A CN 103776168 A CN103776168 A CN 103776168A
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Abstract
Disclosed is a flue gas efficiently-condensing and waste heat recovery system device and method of a gas-fired boiler. The device comprises a group of flue gas heat network circulating water heat exchanging units which can comprise a plurality of stages of unit bodies, a group of flue gas heat network water supplementing heat exchanging units which can comprise a plurality of stages of unit bodies, and a group of flue gas air heat exchanging units which can comprise a plurality of stages of unit bodies. Every stage of the flue gas circulating water heat exchanging unit body is provided with a flue gas inlet and outlet, a condensing water collecting and discharging port and a water inlet and outlet, and the inside of the flue gas circulating water heat exchanging unit body is provided with a heat exchanging device; every stage of the flue gas heat network water supplementing heat exchanging unit body is provided with a flue gas inlet and outlet and a water inlet and outlet, and the inside of the flue gas heat network water supplementing heat exchanging unit body is provided with a heat exchanging device; every stage of the flue gas air heat exchanging unit body is provided with a flue gas inlet and outlet and a cold and hot air inlet and outlet, and the inside of the flue gas air heat exchanging unit body is provided with a heat exchanging device; the flue gas outlet of every preceding stage unit body is connected with the flue gas inlet of the corresponding post stage unit body. The flue gas of the gas-fired boiler sequentially flows through the three main units, is heat-absorbed stage by stage and lastly is cooled down into low temperature for being exhausted out of an outlet. The flue gas efficiently-condensing and waste heat recovery system device of the gas-fired boiler can effectively decrease the flue gas exhaust temperature of the gas-fired boiler to be below the dew point temperature of the flue gas.
Description
Technical field
The invention belongs to energy-saving equipment technical field, relate in particular to a kind of gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device.
Background technology
Along with the propelling of China's energy-saving and environmental protection policy, gas consumption figure constantly increases, gas fired-boiler is widely applied in every profession and trade, particularly huge at heating industry consumption at gas fired-boiler in recent years, and a lot of city heat supply boilers in the whole nation or carry out steam coal and change gas.How to improve the thermal efficiency in gas fired-boiler room, reduce gas consumption, become the focus of paying close attention in the industry.Particularly flue gas waste heat recovery apparatus application can more directly improve heat energy efficiency, but at present a lot of flue gas waste heat recovery apparatus do not have integrated, can not effectively control waste heat recovery efficiency, most of devices can only recovered flue gas sensible heat, flue gas can not be reduced to below condensation temperature, affect the efficiency of waste heat recovery.
According to theory analysis measuring and calculating, 25 ℃ of the every reductions of exhaust gas temperature, sensible heat reclaims and can make boiler thermal output improve approximately 1.0～1.2% left and right (sensible heat effect).Gas fired-boiler discharge flue gas in except sensible heat, the latent heat that also has a large amount of steam to take away, the major part (approximately 70% left and right) of this part heat loss is recuperable.Flue gas dew point temperature is generally 58 ℃ of left and right, if exhaust gas temperature is dropped to below flue gas condensing temperature, by recycling steam latent heat, can very effectively improve boiler thermal output, is about 7～10%.Be reduced to dew-point temperature sensible heat recovery before and can make the steam generator system thermal efficiency improve 2～6%, if exhaust gas temperature is dropped to below flue gas dew point temperature, can make the thermal efficiency improve 10～16%.
Therefore, invention is used a kind of exhaust gas temperature that can effectively reduce urgently can obtain to the system below flue gas dew point temperature.
Summary of the invention
The object of this invention is to provide a kind of gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device that can greatly improve the thermal efficiency, it can effectively reduce gas fired-boiler exhaust gas temperature below flue gas dew point temperature.
For achieving the above object, the present invention takes following design:
A kind of gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device, it includes:
One group of flue gas heat supply network recirculated water heat exchange unit, at least include one-level flue gas heat supply network recirculated water heat exchanging unit bodies, exhanst gas outlet is offered on the top of flue gas heat supply network recirculated water heat exchanging unit bodies at different levels, gas approach is offered in bottom, condensation water collection floss hole is established in bottom, flue gas heat supply network recirculated water heat exchanging unit bodies is built-in with heat-exchanger rig, is located at respectively the bottom of flue gas heat supply network recirculated water heat exchanging unit bodies for the heat supply network recirculated water import and export of heat-exchanger rig work; If unit more than two-stage, the gas approach of the exhanst gas outlet of previous stage unit one-level after flue connects;
One group of flue gas heat supply network moisturizing heat exchange unit, at least include one-level flue gas heat supply network moisturizing heat exchanging unit bodies, exhanst gas outlet is offered on the top of flue gas heat supply network moisturizing heat exchanging unit bodies at different levels, gas approach is offered in bottom, flue gas heat supply network moisturizing heat exchanging unit bodies is built-in with heat-exchanger rig, is opened in respectively the bottom of moisturizing heat exchanging unit bodies for the heat supply network moisturizing import and export of heat-exchanger rig work; If unit more than two-stage, the gas approach of the exhanst gas outlet of previous stage unit one-level after flue connects;
One group of flue gas air heat-exchange unit, at least include one-level flue gas air heat-exchange cell cube, exhanst gas outlet is offered on the top of flue gas air heat-exchange cell cubes at different levels, gas approach is offered in bottom, flue gas air heat-exchange cell cube is built-in with heat-exchanger rig, is opened in respectively the both sides of flue gas air heat-exchange cell cube for the cold and hot air import and export of heat-exchanger rig work; If unit more than two-stage, the gas approach of the exhanst gas outlet of previous stage unit one-level after flue connects;
The exhanst gas outlet of described flue gas heat supply network recirculated water heat exchange unit afterbody unit connects the gas approach of the first order unit of flue gas heat supply network moisturizing heat exchange unit through flue; The exhanst gas outlet of described flue gas heat supply network moisturizing heat exchange unit afterbody unit connects the gas approach of the first order unit of smoke combustion air heat-exchange unit through flue; The heat supply network moisturizing import and export of the heat supply network recirculated water import and export of described flue gas heat supply network recirculated water heat exchange unit and flue gas heat supply network moisturizing heat exchange unit is all through water lines water inlet, water outlet, and the cold and hot air import and export of described flue gas air heat-exchange unit enters cold air, goes out hot-air through air pipe.
In described gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device, the cell cubes at different levels of flue gas heat supply network recirculated water heat exchange unit, the cell cubes at different levels of flue gas heat supply network moisturizing heat exchange unit can sequentially be connected and integrate with the cell cubes at different levels of flue gas air heat-exchange unit.
In described gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device, corresponding monitoring device is set in the flue of each water lines, air pipe and each inter-stage, and can arranges the central controller of each monitoring device being implemented to integral monitoring.
Another object of the present invention is to provide gas fired-boiler flue gas high-efficiency condensation exhaust heat recovering method, and it utilizes the aforesaid gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device of stating effectively to reclaim the smoke evacuation heat absorption of gas fired-boiler.
For achieving the above object, the present invention takes following design:
Gas fired-boiler flue gas high-efficiency condensation exhaust heat recovering method of the present invention is: set up in advance aforesaid gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device, set up the heat exchange of flue gas heat supply network recirculated water, three master units of the moisturizing heat exchange of flue gas heat supply network and flue gas air heat-exchange, the gas approach of this device flue gas heat supply network recirculated water heat exchange unit first order cell cube is connected with the exhaust opening of gas fired-boiler, flue gas heat supply network recirculated water heat exchange unit is connected with supply channel respectively with the water inlet of the cell cubes at different levels of flue gas heat supply network moisturizing heat exchange unit, water out is connected to respectively reception water unit, the hot air outlet of flue gas air heat-exchange unit is connected to external application unit, enable system, the smoke evacuation of gas fired-boiler is flowed through and mistake one by one from the heat exchange of flue gas heat supply network recirculated water, the moisturizing heat exchange of flue gas heat supply network and three master units of flue gas air heat-exchange, heat absorption step by step, final is discharged by the low-temperature flue gas outlet of gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device end after cooling.
In described gas fired-boiler flue gas high-efficiency condensation exhaust heat recovering method, can be in each water lines, corresponding monitoring device is set in the flue of air pipe and each inter-stage, arrange can integral monitoring unit at different levels heat-exchanger rig medium temperature and the integral monitoring central controller of pressure, the center processor of this integral monitoring central controller is realized automatic integrating and fuzzy control according to each group of medium parameter, according to exhanst gas outlet temperature and pressures at different levels, air exit temp requires and water outlet temperature safety requirements, regulate the heat exchange amount of heat-exchanger rigs at different levels, the system control of realization realizes system control, automatic operating.
Advantage of the present invention is:
1, use this gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device a large amount of calorific potentials in smoke evacuation can be reclaimed, can improve significantly boiler thermal output;
2, by the waste heat recovery of multi-stag, the exhaust gas temperature of gas fired-boiler can be dropped to below flue gas dew point temperature, greatly improve the efficiency of waste heat recovery.
3, monitor, control each group of (level) unit medium parameter by central controller control, realize safety, automatic operating adjusting.
4, energy-saving and emission-reduction, for user can bring significant economic benefit.
Accompanying drawing explanation
Fig. 1 is gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device one embodiment foundation structure schematic diagram of the present invention.
Fig. 2 is that this gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device forms and control principle schematic diagram.
Below in conjunction with drawings and the specific embodiments, the present invention is described in further details.
The specific embodiment
Consult shown in Fig. 1, gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device of the present invention is established three groups of master units from front to back altogether: flue gas heat supply network recirculated water heat exchange unit 1, flue gas heat supply network moisturizing heat exchange unit 2 and flue gas air heat-exchange unit 3, in each master unit, can select one or more levels cell cube according to project situation, can be by string or form UNICOM in parallel between multi-level unit body.
As shown in Figure 1, it is an embodiment foundation structure schematic diagram of gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device of the present invention, described flue gas heat supply network recirculated water heat exchange unit includes two-stage (I level and II level) flue gas heat supply network recirculated water heat exchanging unit bodies 1, described flue gas heat supply network moisturizing heat exchange unit includes one-level (III level) flue gas heat supply network moisturizing heat exchanging unit bodies 2, and described flue gas air heat-exchange unit includes one-level (IV level) flue gas air heat-exchange cell cube 3.
Shown in Fig. 1, Fig. 2, flue gas import and export 11,12 is offered respectively in the upper and lower part of described flue gas heat supply network recirculated water heat exchanging unit bodies at different levels, condensation water collection floss hole 15 is established in bottom, flue gas heat supply network recirculated water heat exchanging unit bodies is built-in with heat-exchanger rig, establishes respectively for a net of heat-exchanger rig work and the heat supply network recirculated water import and export 13,14 of two nets in the bottom of flue gas heat supply network recirculated water heat exchanging unit bodies.
Flue gas import and export 21,22 is offered respectively in the upper and lower part of described flue gas heat supply network moisturizing heat exchange units at different levels; Flue gas heat supply network moisturizing heat exchanging unit bodies is built-in with heat-exchanger rig, establishes respectively the moisturizing import and export 23,24 for heat-exchanger rig work in the bottom of moisturizing heat exchanging unit bodies.
Flue gas import and export 31,32 is opened respectively in the upper and lower part of described flue gas air heat-exchanges at different levels unit; Flue gas air heat-exchange cell cube is built-in with heat-exchanger rig, offer hot and cold air import and export 33,34 in the both sides of flue gas air heat-exchange cell cube, cold air can draw from outdoor or indoor, and hot-air can be guided to the air interface of burner for gas boiler or for heating room air.
Described each heat-exchanger rig all can adopt various efficient heat exchangers, as heat exchange of heat pipe, volume heat exchanger and plate type heat exchanger etc., or designs separately according to the efficient heat pipe heat exchanging principle of project situation utilization.
Fig. 1, embodiment illustrated in fig. 2 in, the I level flue gas heat supply network recirculated water heat exchange unit in the first master unit can effectively absorb obvious heat of smoke; II level flue gas heat supply network recirculated water heat exchange unit in the first master unit can continue to absorb obvious heat of smoke; III level flue gas heat supply network moisturizing heat exchange unit in the second master unit can further absorb obvious heat of smoke; IV level flue gas air heat-exchange unit in the 3rd master unit can effectively absorb obvious heat of smoke and latent heat; Pass through the recuperation of heat excessively repeatedly of multi-level unit like this, make finally can make the exhaust gas temperature of gas fired-boiler to drop to below flue gas dew point temperature.
In described gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device, the cell cubes at different levels of flue gas heat supply network recirculated water heat exchange unit are sequentially connected with the cell cubes at different levels of flue gas heat supply network moisturizing heat exchange unit, integrate (integrated) and be integrated, so not only economized and shared space has been installed but also saves material.The water out of previous stage also can be connected to the water inlet of next stage, to recycle.
Shown in Figure 2, in gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device, corresponding monitoring device (as Pressure gauge PT) is set in the flue of each water lines, air pipe and each inter-stage, and can arranges the central controller 4 of each monitoring device being implemented to integral monitoring.The parameters such as hot air temperature, heat supply network quantity of circulating water, rate of water make-up and out temperature that can be as required, control confluent not at the same level according to preferential assurance and safety factor etc., Comprehensive Control exhaust gas temperature is reduced to below flue gas dew point temperature, guarantees safety and improves the thermal efficiency.
Gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device of the present invention also can, according to flue-gas temperature situation not at the same level, be selected the resistant material of different stage, guarantees facility service life.If multiple-unit set assembly, should employing standard connects convenient installation between at different levels.
Adopt device and method of the present invention, can make the burner of itself and gas fired-boiler form dynamically chain, make burner hearth reach all the time best fired state, can also maximized recovery waste heat; And can arrange control system to realize safe operation and to utilize to greatest extent the function of fume afterheat.
The various embodiments described above can some variations in addition under not departing from the scope of the present invention, thus above explanation comprises and accompanying drawing shown in structure should be considered as exemplary, but not in order to limit the protection domain of the present patent application patent.
Claims (6)
1. a gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device, is characterized in that including:
One group of flue gas heat supply network recirculated water heat exchange unit, at least include one-level flue gas heat supply network recirculated water heat exchanging unit bodies, exhanst gas outlet is offered on the top of flue gas heat supply network recirculated water heat exchanging unit bodies at different levels, gas approach is offered in bottom, condensation water collection floss hole is established in bottom, flue gas heat supply network recirculated water heat exchanging unit bodies is built-in with heat-exchanger rig, is located at respectively the bottom of flue gas heat supply network recirculated water heat exchanging unit bodies for the heat supply network recirculated water import and export of heat-exchanger rig work; If unit more than two-stage, the gas approach of the exhanst gas outlet of previous stage unit one-level after flue connects;
One group of flue gas heat supply network moisturizing heat exchange unit, at least include one-level flue gas heat supply network moisturizing heat exchanging unit bodies, exhanst gas outlet is offered on the top of flue gas heat supply network moisturizing heat exchanging unit bodies at different levels, gas approach is offered in bottom, flue gas heat supply network moisturizing heat exchanging unit bodies is built-in with heat-exchanger rig, is opened in respectively the bottom of moisturizing heat exchanging unit bodies for the heat supply network moisturizing import and export of heat-exchanger rig work; If unit more than two-stage, the gas approach of the exhanst gas outlet of previous stage unit one-level after flue connects;
One group of flue gas air heat-exchange unit, at least include one-level flue gas air heat-exchange cell cube, exhanst gas outlet is offered on the top of flue gas air heat-exchange cell cubes at different levels, gas approach is offered in bottom, flue gas air heat-exchange cell cube is built-in with heat-exchanger rig, is opened in respectively the both sides of flue gas air heat-exchange cell cube for the cold and hot air import and export of heat-exchanger rig work; If unit more than two-stage, the gas approach of the exhanst gas outlet of previous stage unit one-level after flue connects;
The exhanst gas outlet of described flue gas heat supply network recirculated water heat exchange unit afterbody unit connects the gas approach of the first order unit of flue gas heat supply network moisturizing heat exchange unit through flue; The exhanst gas outlet of described flue gas heat supply network moisturizing heat exchange unit afterbody unit connects the gas approach of the first order unit of smoke combustion air heat-exchange unit through flue; The heat supply network moisturizing import and export of the heat supply network recirculated water import and export of described flue gas heat supply network recirculated water heat exchange unit and flue gas heat supply network moisturizing heat exchange unit is all through water lines water inlet, water outlet, and the cold and hot air import and export of described flue gas air heat-exchange unit enters cold air, goes out hot-air through air pipe.
2. gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device according to claim 1, is characterized in that: the cell cubes at different levels of described flue gas heat supply network recirculated water heat exchange unit, the cell cubes at different levels of flue gas heat supply network moisturizing heat exchange unit, the cell cubes at different levels of flue gas air heat-exchange unit sequentially connect and integrate.
3. gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device according to claim 1 and 2, is characterized in that: corresponding monitoring device is set in the flue of each water lines, air pipe and each inter-stage.
4. gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device according to claim 3, is characterized in that: arrange the central controller of each monitoring device being implemented to integral monitoring.
5. a gas fired-boiler flue gas high-efficiency condensation exhaust heat recovering method, it is characterized in that: set up in advance gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device as claimed in claim 1, set up the heat exchange of flue gas heat supply network recirculated water, three master units of the moisturizing heat exchange of flue gas heat supply network and flue gas air heat-exchange, the gas approach of this device flue gas heat supply network recirculated water heat exchange unit first order cell cube is connected with the exhaust opening of gas fired-boiler, flue gas heat supply network recirculated water heat exchange unit is connected with supply channel respectively with the water inlet of the cell cubes at different levels of flue gas heat supply network moisturizing heat exchange unit, water out is connected to respectively reception water unit, the hot air outlet of flue gas air heat-exchange unit is connected to external application unit, enable system, the smoke evacuation of gas fired-boiler is flowed through and mistake one by one from the heat exchange of flue gas heat supply network recirculated water, the moisturizing heat exchange of flue gas heat supply network and three master units of flue gas air heat-exchange, heat absorption step by step, final is discharged from outlet by the low-temperature flue gas of gas fired-boiler flue gas high-efficiency condensation waste heat recovery system device end after cooling.
6. gas fired-boiler flue gas high-efficiency condensation exhaust heat recovering method according to claim 5, it is characterized in that: in each water lines, corresponding monitoring device is set in the flue of air pipe and each inter-stage, arrange can integral monitoring unit at different levels heat-exchanger rig medium temperature and the integral monitoring central controller of pressure, the center processor of this integral monitoring central controller is realized automatic integrating and fuzzy control according to each group of medium parameter, according to exhanst gas outlet temperature and pressures at different levels, air exit temp requires and water outlet temperature safety requirements, regulate the heat exchange amount of heat-exchanger rigs at different levels, realize system control, automatic operating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210401289.9A CN103776168A (en) | 2012-10-19 | 2012-10-19 | Flue gas efficiently-condensing and waste heat recovery system device and method of gas-fired boiler |
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| CN201210401289.9A CN103776168A (en) | 2012-10-19 | 2012-10-19 | Flue gas efficiently-condensing and waste heat recovery system device and method of gas-fired boiler |
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| CN106765268A (en) * | 2017-01-19 | 2017-05-31 | 清华大学 | A kind of residual heat from boiler fume depth retracting device |
| CN107559861A (en) * | 2017-09-08 | 2018-01-09 | 清华大学 | Three towers unification heat-exchange method and device based on the circulation of boiler exhaust gas condensate heat-carrying |
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