CN204084324U - A kind of boiler smoke degree of depth heat reclamation device - Google Patents
A kind of boiler smoke degree of depth heat reclamation device Download PDFInfo
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- CN204084324U CN204084324U CN201420430664.7U CN201420430664U CN204084324U CN 204084324 U CN204084324 U CN 204084324U CN 201420430664 U CN201420430664 U CN 201420430664U CN 204084324 U CN204084324 U CN 204084324U
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Abstract
A kind of boiler smoke degree of depth heat reclamation device, belongs to heat recovery technology field.The utility model comprises the N level heat reclamation device of boiler, flue gas-backwater heat exchanger and arranged in series, wherein N >=1.Every grade of heat reclamation device all comprises nozzle, flue gas-air heat exchanger, flue gas condensed tank, flue gas condensed water pipe, recuperation of heat water leg, recuperation of heat drainpipe etc.Every grade of heat reclamation device improves the equivalent thermal capacitance of air by the shower humidification of air side, considerably increase the heat-carrying capacity of air, makes the exhaust gas temperature of boiler lower, realizes the degree of depth recuperation of heat of boiler smoke from air side.The utility model have employed the air intake of boiler and flue gas carries out heat exchange, by increasing air moisture content to the means of air intake air side shower humidification, improve the equivalent thermal capacitance of air, thus realize larger heat exchange amount, effectively reduce exhaust gas temperature, fully reclaim fume afterheat; In addition, wetness of fuel increase can reduce ignition temperature, can reduce NO
xformation.
Description
Technical field
The utility model relates to a kind of boiler smoke degree of depth heat reclamation device, is specially adapted to gas fired-boiler and fire coal boiler fume waste heat recovery, belongs to waste heat recovery and field of energy-saving technology.
Background technology
Coal-fired, combustion gas is the topmost energy sources of China, according to statistics, nearly 2,200,000 of the boiler total amount of China, plays an important role in industries such as electric power, metallurgy, weaving, food, with our closely bound up heat supply heating all and domestic hot-water's heat of also needing boiler to provide a large amount of.
And in the various heat loss of boiler, flue gas loss has accounted for 60% ~ 70%.It is a kind ofly be not only huge energy waste that high-temperature flue gas is directly drained, and can cause environmental pollution.If the heat of smoke evacuation effectively can be reclaimed, improve the thermal efficiency of boiler, a large amount of fuel consumptions can be saved.Therefore take effective method to realize the high efficiente callback of the fume afterheat of boiler, be the emphasis that people pay close attention to always.
Economizer is the mature technology now applied, and it mainly by the heat of the low-temperature flue gas of absorption, thus reduces the temperature of smoke evacuation, saves the energy, improves efficiency.But in the design of economizer, in order to avoid acid corrosion problem, in heat transfer process, requirement can not produce solidifying water (acid), namely heat transfer process just plays the effect of recuperation of heat by the sensible heat reducing flue gas.Therefore, current economizer only can make boiler efficiency improve about 5%, and now exhaust gas temperature is still more than 100 DEG C, and smoke evacuation still has a lot of heats (sensible heat and latent heat) not to be recovered utilization.
Can more degree of depth Mist heat recovering, reduce exhaust gas temperature further, be the topic received much concern all the time, also have certain challenge and difficulty.Existing comparatively ripe representative art mainly contains following two kinds at present:
One, patent document ZL201320699289.1 proposes a kind of flue gas waste heat recovery system based on absorption heat pump technology.System critical piece is gas fired-boiler, gas driven absorption heat pump and direct contact type cigarette water-to-water heat exchanger, to be lowered the temperature condensation by direct contact type cigarette water-to-water heat exchanger after the flue gas that wherein gas fired-boiler and absorption heat pump produce converges, one recirculated water circulates between cigarette water-to-water heat exchanger and absorption heat pump, recirculated water is lowered the temperature by the evaporimeter getting back to absorption heat pump after flue gas, and low-temperature circulating water passes into heat exchanger and flue gas heat exchange again.Hot water side, a secondary net backwater passes into the absorber of absorption heat pump first successively and condenser is preheated, and the secondary net water after preheating enters gas fired-boiler again, after being heated as a secondary net for backwater supply heat exchange station or heat user.According to such waste heat recovery scheme, boiler thermal output generally can improve about 12% (calculating by low calorific gas value).
Two, patent document CN201110371994.4 discloses a kind of flue gas heat recovery and udst separation composite equipment.This equipment comprises heat exchange absorbing compound device, dividing wall type heat exchanger, precipitation collection blowdown apparatus, solution pool and liquid pump; The top of heat exchange absorbing compound device is provided with liquid distribution trough, and liquid wall-type heat exchange device is positioned at the bottom of heat exchange absorbing compound device, and the bottom of heat exchange absorbing compound device is provided with precipitation and collects blowdown apparatus.Heat exchange absorbing compound device is made up of gas approach section, gas approach diversion section, heat exchange absorber portion, exhanst gas outlet gear liquid diversion section and gas approach section, is furnished with liquid mesh-type liquid film distribution of net in heat exchange absorber portion.This design integrates waste heat recovery and purified treatment, not only can recycle smoke evacuation sensible heat and latent heat, also have the effects such as anticorrosion dedusting antiscale, purified treatment concurrently, and reduce flow resistance and blower and water pump energy consumption, reduce the cost of product, reach flue gas heat recovery, boiler thermal output generally can improve about 10% (calculating by low calorific gas value) simultaneously.
But all there is respective technology short slab in above-mentioned two kinds of technical schemes.Initial cost based on the flue gas waste heat recovery equipment of Absorption heat-transformer is huge, and economy is not good enough, more difficultly in Practical Project promotes on a large scale.And " a kind of flue gas heat recovery and udst separation composite equipment " topmost advantage is the corrosion problems solved in flue gas waste heat recovery, but because the temperature of its cold medium is low not, exchange capability of heat is limited, and exhaust gas temperature is still higher, and the recuperation of heat degree of depth is inadequate.
Utility model content
The deficiency existed for prior art and defect, the purpose of this utility model proposes a kind of boiler smoke degree of depth heat reclamation device, carry out on the basis of a recuperation of heat utilizing common flue gas-backwater heat exchanger, propose innovatively to carry out shower humidification in air side, thus reclaim the thought that smoke evacuation latent heat realizes degree of depth recuperation of heat further.By giving the combustion air shower humidification sending into boiler, increasing the equivalent thermal capacitance of air, improving the recuperation of heat ability of air further.
The technical solution of the utility model is as follows:
A kind of boiler smoke degree of depth heat reclamation device, comprise flue gas-backwater heat exchanger and boiler, described flue gas-backwater heat exchanger comprises a secondary net backwater entrance, a secondary net backwater outlet, backwater heat exchanger smoke inlet, backwater heat exchanger exhanst gas outlet, backwater heat exchanger coagulate tank and backwater heat exchanger discharge outlet; Described boiler comprises the outlet of boiler flue gas outlet, boiler air entrance, boiler blow-down water mouth and boiler hot-water; Described boiler flue gas outlet is connected with backwater heat exchanger smoke inlet, and a secondary net backwater outlet is connected with boiler blow-down water mouth, and backwater heat exchanger coagulates the bottom that tank and backwater heat exchanger discharge outlet are positioned at flue gas-backwater heat exchanger;
It is characterized in that: described boiler smoke degree of depth heat reclamation device also comprises the N level heat reclamation device of arranged in series, wherein N >=1; Every grade of heat reclamation device all comprises recuperation of heat smoke inlet, shower water entrance, nozzle, flue gas-air heat exchanger, recuperation of heat exhanst gas outlet, flue gas condensed tank, flue gas condensed water pipe, recuperation of heat water leg, recuperation of heat drainpipe, recuperation of heat air intake and recuperation of heat air outlet slit; In every grade of heat reclamation device, described nozzle, flue gas-air heat exchanger, recuperation of heat water leg and recuperation of heat drainpipe are arranged from top to bottom successively; Flue gas condensed tank and flue gas condensed water pipe are arranged in the bottom of flue gas-air heat exchanger successively;
Backwater heat exchanger exhanst gas outlet is connected with first order recuperation of heat smoke inlet, and every grade of recuperation of heat exhanst gas outlet is connected with subordinate recuperation of heat smoke inlet, and N level recuperation of heat exhanst gas outlet communicates with the external world; Every grade of recuperation of heat air intake is connected with subordinate recuperation of heat air outlet slit;
N level recuperation of heat air intake communicates with the external world, and first order recuperation of heat air outlet slit is connected with boiler air entrance (202); Every grade of recuperation of heat drainpipe is connected with subordinate recuperation of heat water leg, and N level recuperation of heat drainpipe communicates with the external world, and every grade of recuperation of heat drainpipe after first order heat reclamation device is also connected with the shower water entrance of the corresponding levels.
In technique scheme, the first order shower water entrance of the N level heat reclamation device of described arranged in series is connected with external water source or backwater heat exchanger discharge outlet; Described external water source is running water, surface water or underground water.
Technical characteristic of the present utility model is also: all have the solidifying water discharge gradient bottom the flue gas-air heat exchanger in described every grade of heat reclamation device.Flue gas-air heat exchanger in every grade of heat reclamation device adopts cross-flow heat exchanger, contra-flow heat exchanger or down-stream heat exchanger.
The utility model tool compared with existing hot water preparation system has the following advantages:
1. relative to existing heat reclamation device, increased the equivalent thermal capacitance of air by the shower humidification of air side, greatly improve the heat-carrying capacity of air, reduce exhaust gas temperature, the recuperation of heat of flue gas is doubled, saves fuel consumption; 2. the water vapour content in boiler air-supply is increased, useful to burning, the discharge of nitrogen oxide can be reduced; 3. the water vapour content of boiler export smoke evacuation increases, and the heat that can reclaim in flue gas-backwater heat-exchanger rig is more, and high temperature condensate flow increases and also increases to some extent with the heat exchange amount of a secondary net; 4. significantly improve flue gas waste heat recovery amount and boiler thermal output, even if calculate according to the higher calorific value of natural gas under general operating mode, the thermal efficiency of boiler also can more than 100%; 5. the thermal efficiency owing to improving boiler can save the consumption of natural gas, thus reduces the discharge of atmosphere pollution, possesses very large meaning to energy-saving ring.
Generally speaking, the air intake of boiler is have employed and flue gas carries out heat exchange due to the utility model, by increasing air moisture content to the means of air intake air side shower humidification, improve the equivalent thermal capacitance of air, thus realize larger heat exchange amount, effectively reduce exhaust gas temperature, fully reclaim fume afterheat." full heat " that this technology achieves air and flue gas by the shower humidification of air side exchanges.In addition, wetness of fuel increase can reduce ignition temperature, can reduce NO
xformation, effectively reduce pollutant emission, overcome the shortcoming of existing heat reclamation device, can realize the recuperation of heat realizing the more degree of depth under lower cost and operating cost, effects of energy saving and emission reduction is remarkable.
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of single-stage of the present utility model external Water spray boiler smoke degree of depth heat reclamation device embodiment.
Fig. 2 is the structural principle schematic diagram of the embodiment of single-stage condensed water of the present utility model spray.
Wherein: 1-flue gas-backwater heat exchanger; 101-mono-secondary net backwater entrance; 102-mono-secondary net backwater exports; 103-backwater heat exchanger smoke inlet; 104-backwater heat exchanger exhanst gas outlet; 105-backwater heat exchanger coagulates tank; 106-backwater heat exchanger discharge outlet; 2-boiler; 201-boiler flue gas outlet; 203-boiler blow-down water mouth; 204-boiler hot-water exports; 3-first order heat reclamation device; 301-first order recuperation of heat smoke inlet; 302-first order shower water entrance; 303-first order nozzle; 304-first order flue gas-air heat exchanger; 305-first order recuperation of heat exhanst gas outlet; 306-first order flue gas condensed tank; 307-first order flue gas condensed water pipe; 308-first order recuperation of heat water leg; 309-first order recuperation of heat drainpipe; 310-first order recuperation of heat air intake; 311-first order recuperation of heat air outlet slit.
Fig. 3 is the structural principle schematic diagram of two-stage of the present utility model external Water spray boiler smoke degree of depth heat reclamation device embodiment.
Fig. 4 is the structural principle schematic diagram of condensed in two stages Water spray boiler smoke degree of depth heat reclamation device embodiment of the present utility model.
Wherein: 1-flue gas-backwater heat exchanger; 101-mono-secondary net backwater entrance; 102-mono-secondary net backwater exports; 103-backwater heat exchanger smoke inlet; 104-backwater heat exchanger exhanst gas outlet; 105-backwater heat exchanger coagulates tank; 106-backwater heat exchanger discharge outlet; 2-boiler; 201-boiler flue gas outlet; 203-boiler blow-down water mouth; 204-boiler hot-water exports; 3-first order heat reclamation device; 301-first order recuperation of heat smoke inlet; 302-first order shower water entrance; 303-first order nozzle; 304-first order flue gas-air heat exchanger; 305-first order recuperation of heat exhanst gas outlet; 306-first order flue gas condensed tank; 307-first order flue gas condensed water pipe; 308-first order recuperation of heat water leg; 309-first order recuperation of heat drainpipe; 310-first order recuperation of heat air intake; 311-first order recuperation of heat air outlet slit; 4-second level heat reclamation device; 401-second level recuperation of heat smoke inlet; 402-second level shower water entrance; 403-second level nozzle; 404-second level flue gas-air heat exchanger; 405-second level recuperation of heat exhanst gas outlet; 406-second level flue gas condensed tank; 407-second level flue gas condensed water pipe; 408-second level recuperation of heat water leg; 409-second level recuperation of heat drainpipe; 410-second level recuperation of heat air intake; 411-second level recuperation of heat air outlet slit;
Fig. 5 is the structural principle schematic diagram of multistage external Water spray boiler smoke degree of depth heat reclamation device embodiment of the present utility model.
Fig. 6 is the structural principle schematic diagram of multi-stage condensing Water spray boiler smoke degree of depth heat reclamation device embodiment of the present utility model.
Wherein: 1-flue gas-backwater heat exchanger; 101-mono-secondary net backwater entrance; 102-mono-secondary net backwater exports; 103-backwater heat exchanger smoke inlet; 104-backwater heat exchanger exhanst gas outlet; 105-backwater heat exchanger coagulates tank; 106-backwater heat exchanger discharge outlet; 2-boiler; 201-boiler flue gas outlet; 203-boiler blow-down water mouth; 204-boiler hot-water exports; 3-first order heat reclamation device; 301-first order recuperation of heat smoke inlet; 302-first order shower water entrance; 303-first order nozzle; 304-first order flue gas-air heat exchanger; 305-first order recuperation of heat exhanst gas outlet; 306-first order flue gas condensed tank; 307-first order flue gas condensed water pipe; 308-first order recuperation of heat water leg; 309-first order recuperation of heat drainpipe; 310-first order recuperation of heat air intake; 311-first order recuperation of heat air outlet slit; 5-N level heat reclamation device; 501-N level recuperation of heat smoke inlet; 502-N level shower water entrance; 503-N level nozzle; 504-N level flue gas-air heat exchanger; 505-N level recuperation of heat exhanst gas outlet; 506-N level flue gas condensed tank; 507-N level flue gas condensed water pipe; 508-N level recuperation of heat water leg; 509-N level recuperation of heat drainpipe; 510-N level recuperation of heat air intake; 511-N level recuperation of heat air outlet slit.
Detailed description of the invention
A kind of boiler smoke degree of depth heat reclamation device that the utility model provides, comprises the N level heat reclamation device of flue gas-backwater heat exchanger 1, boiler 2 and arranged in series, wherein N >=1; Described flue gas-backwater heat exchanger 1 comprises secondary net backwater entrance 101, secondary net backwater outlet 102, backwater heat exchanger smoke inlet 103, backwater heat exchanger exhanst gas outlet 104, backwater heat exchanger coagulate tank 105 and backwater heat exchanger discharge outlet 106; Described boiler 2 comprises boiler flue gas outlet 201, boiler air entrance 202, boiler blow-down water mouth 203 and boiler hot-water outlet 204; Described boiler flue gas outlet 201 is connected with backwater heat exchanger smoke inlet 103, and a secondary net backwater outlet 102 is connected with boiler blow-down water mouth 203, and backwater heat exchanger coagulates the bottom that tank 105 and backwater heat exchanger discharge outlet 106 are positioned at flue gas-backwater heat exchanger 1.Every grade of heat reclamation device all comprises recuperation of heat smoke inlet, shower water entrance, nozzle, flue gas-air heat exchanger, recuperation of heat exhanst gas outlet, flue gas condensed tank, flue gas condensed water pipe, recuperation of heat water leg, recuperation of heat drainpipe, recuperation of heat air intake and recuperation of heat air outlet slit; In every grade of heat reclamation device, described nozzle, flue gas-air heat exchanger, recuperation of heat water leg and recuperation of heat drainpipe are arranged from top to bottom successively; Flue gas condensed tank and flue gas condensed Guan Shui are arranged in the bottom of flue gas-air heat exchanger successively; Backwater heat exchanger exhanst gas outlet 104 is connected with first order recuperation of heat smoke inlet, and every grade of recuperation of heat exhanst gas outlet is connected with subordinate recuperation of heat smoke inlet, and N level recuperation of heat exhanst gas outlet communicates with the external world; Every grade of recuperation of heat air intake is connected with subordinate recuperation of heat air outlet slit; N level recuperation of heat air intake communicates with the external world, and first order recuperation of heat air outlet slit is connected with boiler air entrance 202; Every grade of recuperation of heat drainpipe is connected with subordinate recuperation of heat water leg, and N level recuperation of heat drainpipe communicates with the external world, and every grade of recuperation of heat drainpipe after first order heat reclamation device is also connected with the shower water entrance of the corresponding levels.
Below in conjunction with accompanying drawing, structure of the present utility model and the method for operation are described further.
Fig. 1 is the structural principle schematic diagram of single-stage of the present utility model external Water spray boiler smoke degree of depth heat reclamation device embodiment, comprise flue gas-backwater heat exchanger 1 and boiler 2, described flue gas-backwater heat exchanger 1 comprises secondary net backwater entrance 101, secondary net backwater outlet 102, backwater heat exchanger smoke inlet 103, backwater heat exchanger exhanst gas outlet 104, backwater heat exchanger coagulate tank 105 and backwater heat exchanger discharge outlet 106; Described boiler 2 comprises boiler flue gas outlet 201, boiler air entrance 202, boiler blow-down water mouth 203 and boiler hot-water outlet 204; Described boiler flue gas outlet 201 is connected with backwater heat exchanger smoke inlet 103, and a secondary net backwater outlet 102 is connected with boiler blow-down water mouth 203, and backwater heat exchanger coagulates the bottom that tank 105 and backwater heat exchanger discharge outlet 106 are positioned at flue gas-backwater heat exchanger 1.
Described boiler smoke degree of depth heat reclamation device also comprises first order heat reclamation device 3 (i.e. N=1); Described first order heat reclamation device 3 comprises first order recuperation of heat smoke inlet 301, first order shower water entrance 302, first order nozzle 303, first order flue gas-air heat exchanger 304, first order recuperation of heat exhanst gas outlet 305, first order flue gas condensed tank 306, first order flue gas condensed water pipe 307, first order recuperation of heat water leg 308, first order recuperation of heat drainpipe 309, first order recuperation of heat air intake 310 and first order recuperation of heat air outlet slit 311; In first order heat reclamation device 3, first order nozzle 303, first order flue gas-air heat exchanger 304, first order recuperation of heat water leg 308 and first order recuperation of heat drainpipe 309 are arranged from top to bottom successively, and first order flue gas condensed tank 306 and first order flue gas condensed water pipe 307 are arranged in the bottom of first order flue gas-air heat exchanger 304 successively; Backwater heat exchanger exhanst gas outlet 104 is connected with first order recuperation of heat smoke inlet 301, and first order recuperation of heat exhanst gas outlet 305 communicates with the external world; First order recuperation of heat air intake 310 communicates with the external world, and first order recuperation of heat air outlet slit 311 is connected with boiler air entrance 202; First order recuperation of heat drainpipe 309 communicates with the external world; The first order shower water entrance 302 of described first order heat reclamation device 3 is connected with external water source; The bottom of the first order flue gas-air heat exchanger 304 of described first order heat reclamation device 3 has the solidifying water discharge gradient; First order flue gas-air heat exchanger 304 is cross-flow heat exchanger, contra-flow heat exchanger or down-stream heat exchanger.
Single-stage provided by the utility model external Water spray boiler smoke degree of depth recuperation of heat running is adopted to be: in first order heat reclamation device 3, flue gas is in first order flue gas-air heat exchanger 304 internal flow, air is in first order flue gas-air heat exchanger 304 flows outside, shower water is at the air side shower humidification of first order flue gas-air heat exchanger 304, form a kind of flue gas, air and shower water three process of fluid streams heat and mass, this process specifically comprises the steps:
1) flue gas of the boiler flue gas outlet 201 of described boiler 2 is sent in flue gas-backwater heat exchanger 1 through backwater heat exchanger smoke inlet 103, from backwater heat exchanger exhanst gas outlet 104 discharges after carrying out heat exchange with the secondary net backwater flowed into from a secondary net backwater entrance 101; Flow out through a secondary net backwater outlet 102 after one secondary net backwater absorbs the heat of flue gas, and send into boiler 2 by boiler blow-down water mouth 203, be heated to temperature required after give heat user from boiler hot-water outlet 204; Flue gas is under the cooling of a secondary net backwater, and the solidifying water condensed out is collected to backwater heat exchanger and coagulates tank 105, and discharges through backwater heat exchanger discharge outlet 106;
2) for flue gas recirculation: the flue gas of being discharged by backwater heat exchanger exhanst gas outlet 104 enters first order heat reclamation device 3 through first order recuperation of heat smoke inlet 301, and at first order flue gas-air heat exchanger 304 flows downward inside, after recuperation of heat, flue gas finally from first order recuperation of heat exhanst gas outlet 305 discharged to outdoor or smoke evacuation purifying processing device;
3) air is circulated: outside air enters first order heat reclamation device 3 from first order recuperation of heat air intake 310, and first order flue gas-air heat exchanger 304 externally on flowing, after recuperation of heat, air finally flows out from first order recuperation of heat air outlet slit 311, and sends in boiler 2 combustion-supporting through boiler air entrance 202;
4) for spray and solidifying water circulation: external water source (running water, surface water or underground water) manages outer spray through first order nozzle 303 at first order flue gas-air heat exchanger 304, give the air shower humidification upwards flowed, thus improve the equivalent thermal capacitance of air; The condensate water separated out after flue gas release latent heat in first order flue gas-air heat exchanger 304 pipe is pooled in first order flue gas condensed tank 306, then flow in first order recuperation of heat water leg 308 through first order flue gas condensed water pipe 307, after mixing with the shower water fallen through first order recuperation of heat drainpipe 309 discharged to extraneous or draining purifying processing device.
After air shower humidification, equivalent thermal capacitance increases, and recuperation of heat ability strengthens, and the heat reclaimed from flue gas increases greatly, reduces smog discharge temperature and water capacity further, achieves the degree of depth recuperation of heat of boiler smoke.In addition, complete the air after recuperation of heat, temperature and water capacity all obviously increase, send into combustion-supporting in boiler 2 after, can not only reduce and add heat and fuel consumption needed for boiler, ignition temperature, the formation reducing NOx and discharge can also be reduced.
Fig. 2 is the structural principle schematic diagram of single-stage condensed water of the present utility model spray boiler smoke degree of depth heat reclamation device embodiment, be to adopt the flue gas condensing water in flue gas-backwater heat exchanger 1 as spraying water source with the difference of Fig. 1, be connected with the first order shower water entrance 302 of first order heat reclamation device 3 by described backwater heat exchanger discharge outlet 106, backwater heat exchanger coagulates the flue gas condensing water collected in tank 105 and passes into first order shower water entrance 302 through backwater heat exchanger discharge outlet 106, as the spray water source of first order heat reclamation device 3.Employing flue gas condensing water as the benefit at spray water source is: flue gas condensed water temperature is higher than running water, easier to the humidification of air.When outdoor air relative humidity is larger, or when winter temperature is lower, generally need to heat air just can complete humidification, and adopt condensed water spray just in time can achieve this end.
Fig. 3 is the structural principle schematic diagram of two-stage of the present utility model external Water spray boiler smoke degree of depth heat reclamation device embodiment, comprise flue gas-backwater heat exchanger 1 and boiler 2, described flue gas-backwater heat exchanger 1 comprises secondary net backwater entrance 101, secondary net backwater outlet 102, backwater heat exchanger smoke inlet 103, backwater heat exchanger exhanst gas outlet 104, backwater heat exchanger coagulate tank 105 and backwater heat exchanger discharge outlet 106; Described boiler 2 comprises boiler flue gas outlet 201, boiler air entrance 202, boiler blow-down water mouth 203 and boiler hot-water outlet 204; Described boiler flue gas outlet 201 is connected with backwater heat exchanger smoke inlet 103, and a secondary net backwater outlet 102 is connected with boiler blow-down water mouth 203, and backwater heat exchanger coagulates the bottom that tank 105 and backwater heat exchanger discharge outlet 106 are positioned at flue gas-backwater heat exchanger 1.
Described boiler smoke degree of depth heat reclamation device also comprises first order heat reclamation device 3 and the second level heat reclamation device 4 (i.e. N=2) of arranged in series; Described first order heat reclamation device 3 comprises first order recuperation of heat smoke inlet 301, first order shower water entrance 302, first order nozzle 303, first order flue gas-air heat exchanger 304, first order recuperation of heat exhanst gas outlet 305, first order flue gas condensed tank 306, first order flue gas condensed water pipe 307, first order recuperation of heat water leg 308, first order recuperation of heat drainpipe 309, first order recuperation of heat air intake 310 and first order recuperation of heat air outlet slit 311; In first order heat reclamation device 3, first order nozzle 303, first order flue gas-air heat exchanger 304, first order recuperation of heat water leg 308 and first order recuperation of heat drainpipe 309 are arranged from top to bottom successively, and first order flue gas condensed tank 306 and first order flue gas condensed water pipe 307 are arranged in the bottom of first order flue gas-air heat exchanger 304 successively; Described second level heat reclamation device 4 comprises second level recuperation of heat smoke inlet 401, second level shower water entrance 402, second level nozzle 403, second level flue gas-air heat exchanger 404, second level recuperation of heat exhanst gas outlet 405, second level flue gas condensed tank 406, second level flue gas condensed water pipe 407, second level recuperation of heat water leg 408, second level recuperation of heat drainpipe 409, second level recuperation of heat air intake 410 and second level recuperation of heat air outlet slit 411; In second level heat reclamation device 4, second level nozzle 403, second level flue gas-air heat exchanger 404, second level recuperation of heat water leg 408 and second level recuperation of heat drainpipe 409 are arranged from top to bottom successively, and second level flue gas condensed tank 406 and second level flue gas condensed water pipe 407 are arranged in the bottom of second level flue gas-air heat exchanger 404 successively; Backwater heat exchanger exhanst gas outlet 104 is connected with first order recuperation of heat smoke inlet 301, and first order recuperation of heat exhanst gas outlet 305 is connected with second level recuperation of heat smoke inlet 401, and second level recuperation of heat exhanst gas outlet 405 communicates with the external world; Second level recuperation of heat air intake 410 communicates with the external world, and first order recuperation of heat air intake 310 is connected with second level recuperation of heat air outlet slit 411, and first order recuperation of heat air outlet slit 311 is connected with boiler air entrance 202; First order recuperation of heat drainpipe 309 is connected with second level recuperation of heat water leg 408, and second level recuperation of heat drainpipe 409 is connected with second level shower water entrance 402 and communicates with the external world; The first order shower water entrance 302 of described first order heat reclamation device 3 is connected with external water source; The bottom of described first order flue gas-air heat exchanger 304 and second level flue gas-air heat exchanger 404 all has the solidifying water discharge gradient; First order flue gas-air heat exchanger 304 and second level flue gas-air heat exchanger 404 are as cross-flow heat exchanger, contra-flow heat exchanger or down-stream heat exchanger.
Two-stage provided by the utility model external Water spray boiler smoke degree of depth recuperation of heat running is adopted to be: for first order flue gas-air heat exchanger 304 and second level flue gas-air heat exchanger 404, flue gas is in internal flow, air is in flows outside, shower water is at air side shower humidification, in first order heat reclamation device 3 and second level heat reclamation device 4, all form a kind of flue gas, air and shower water three process of fluid streams heat and mass, this process specifically comprises the steps:
1) flue gas of the boiler flue gas outlet 201 of described boiler 2 is sent in flue gas-backwater heat exchanger 1 through backwater heat exchanger smoke inlet 103, from backwater heat exchanger exhanst gas outlet 104 discharges after carrying out heat exchange with the secondary net backwater flowed into from a secondary net backwater entrance 101; Flow out through a secondary net backwater outlet 102 after one secondary net backwater absorbs the heat of flue gas, and send into boiler 2 by boiler blow-down water mouth 203, be heated to temperature required after give heat user from boiler hot-water outlet 204; Flue gas is under the cooling of a secondary net backwater, and the solidifying water condensed out is collected to backwater heat exchanger and coagulates tank 105, and discharges through backwater heat exchanger discharge outlet 106;
2) for flue gas recirculation: the flue gas of being discharged by backwater heat exchanger exhanst gas outlet 104 enters first order heat reclamation device 3 through first order recuperation of heat smoke inlet 301, and at first order flue gas-air heat exchanger 304 flows downward inside, then second level recuperation of heat smoke inlet 401 is flowed to through first order recuperation of heat exhanst gas outlet 305, and at second level flue gas-air heat exchanger 404 flows downward inside, after two levels of thermal reclaims, flue gas finally from second level recuperation of heat exhanst gas outlet 405 discharged to outdoor or smoke evacuation purifying processing device;
3) air is circulated: outside air enters second level heat reclamation device 4 from second level recuperation of heat air intake 410, and second level flue gas-air heat exchanger 404 externally on flowing, then first order recuperation of heat air intake 310 is flowed to through second level recuperation of heat air outlet slit 411, and first order flue gas-air heat exchanger 304 externally on flowing, after two levels of thermal reclaims, air finally flows out from first order recuperation of heat air outlet slit 311, and sends in boiler 2 combustion-supporting through boiler air entrance 202;
4) for spray and solidifying water circulation: external water source (running water, surface water or underground water) manages outer spray through first order nozzle 303 at first order flue gas-air heat exchanger 304, give the air shower humidification upwards flowed, thus improve the equivalent thermal capacitance of air; The condensate water separated out after flue gas release latent heat in first order flue gas-air heat exchanger 304 pipe is pooled in first order flue gas condensed tank 306, then flow in first order recuperation of heat water leg 308 through first order flue gas condensed water pipe 307, arrange 309 through first order recuperation of heat drainpipe after mixing with the shower water fallen and send into second level recuperation of heat water leg 408; The condensate water separated out after flue gas release latent heat in second level flue gas-air heat exchanger 404 pipe is pooled in second level flue gas condensed tank 406, then flow in second level recuperation of heat water leg 408 through second level flue gas condensed water pipe 407, arrange 409 through second level recuperation of heat drainpipe after mixing with the shower water fallen and be divided into two-way, the one inflow second level, tunnel shower water entrance 402 as the spray water source of second level heat reclamation device 4, another road then by unnecessary water discharged to extraneous or draining purifying processing device.
Two-stage external Water spray scheme is except having all advantages of the external Water spray of single-stage shown in Fig. 1 scheme, also there is an important feature: after the air shower humidification that in first order heat reclamation device 3, temperature and water capacity are relatively high, reclaim the heat in the relatively high flue gas of temperature and water capacity in first order flue gas-air heat exchanger 304; In second level heat reclamation device 4 after temperature and the relatively low air shower humidification of water capacity, reclaim the heat in second level flue gas-air heat exchanger 404 temperature and the relatively low flue gas of water capacity.Whole process achieves cascade utilization preferably, provides important leverage to the recuperation of heat of the flue gas degree of depth.Relative to single-stage spray, after the recuperation of heat of two-stage spray, the temperature of air and water capacity increase all further, and smog discharge temperature and water capacity can be even lower, and effects of energy saving and emission reduction is better.
Fig. 4 is the structural principle schematic diagram of condensed in two stages Water spray boiler smoke degree of depth heat reclamation device embodiment of the present utility model, be to adopt the flue gas condensing water in flue gas-backwater heat exchanger 1 as spraying water source with the difference of Fig. 3, be connected with the first order shower water entrance 302 of first order heat reclamation device 3 by described backwater heat exchanger discharge outlet 106, backwater heat exchanger coagulates the flue gas condensing water collected in tank 105 and passes into first order shower water entrance 302 through backwater heat exchanger discharge outlet 106, as the spray water source of first order heat reclamation device 3.Employing flue gas condensing water as the benefit at spray water source is: flue gas condensed water temperature is higher than running water, easier to the humidification of air.When outdoor air relative humidity is larger, or when winter temperature is lower, generally need to heat air just can complete humidification, and adopt condensed water spray just in time can achieve this end.
Fig. 5 is the structural principle schematic diagram of multistage external Water spray boiler smoke degree of depth heat reclamation device embodiment of the present utility model, comprise flue gas-backwater heat exchanger 1 and boiler 2, described flue gas-backwater heat exchanger 1 comprises secondary net backwater entrance 101, secondary net backwater outlet 102, backwater heat exchanger smoke inlet 103, backwater heat exchanger exhanst gas outlet 104, backwater heat exchanger coagulate tank 105 and backwater heat exchanger discharge outlet 106; Described boiler 2 comprises boiler flue gas outlet 201, boiler air entrance 202, boiler blow-down water mouth 203 and boiler hot-water outlet 204; Described boiler flue gas outlet 201 is connected with backwater heat exchanger smoke inlet 103, and a secondary net backwater outlet 102 is connected with boiler blow-down water mouth 203, and backwater heat exchanger coagulates the bottom that tank 105 and backwater heat exchanger discharge outlet 106 are positioned at flue gas-backwater heat exchanger 1; Described boiler smoke degree of depth heat reclamation device also comprises the first order heat reclamation device 3 of arranged in series ..., N level heat reclamation device 5; Described first order heat reclamation device 3 comprises first order recuperation of heat smoke inlet 301, first order shower water entrance 302, first order nozzle 303, first order flue gas-air heat exchanger 304, first order recuperation of heat exhanst gas outlet 305, first order flue gas condensed tank 306, first order flue gas condensed water pipe 307, first order recuperation of heat water leg 308, first order recuperation of heat drainpipe 309, first order recuperation of heat air intake 310 and first order recuperation of heat air outlet slit 311; In first order heat reclamation device 3, first order nozzle 303, first order flue gas-air heat exchanger 304, first order recuperation of heat water leg 308 and first order recuperation of heat drainpipe 309 are arranged from top to bottom successively, and first order flue gas condensed tank 306 and first order flue gas condensed water pipe 307 are arranged in the bottom of first order flue gas-air heat exchanger 304 successively; Described N level heat reclamation device 5 comprises N level recuperation of heat smoke inlet 501, N level shower water entrance 502, N level nozzle 503, N level flue gas-air heat exchanger 504, N level recuperation of heat exhanst gas outlet 505, N level flue gas condensed tank 506, N level flue gas condensed water pipe 507, N level recuperation of heat water leg 508, N level recuperation of heat drainpipe 509, N level recuperation of heat air intake 510 and N level recuperation of heat air outlet slit 511; In N level heat reclamation device 5, N level nozzle 503, N level flue gas-air heat exchanger 504, N level recuperation of heat water leg 508 and N level recuperation of heat drainpipe 509 are arranged from top to bottom successively, and N level flue gas condensed tank 506 and N level flue gas condensed water pipe 507 are arranged in the bottom of N level flue gas-air heat exchanger 504 successively; Backwater heat exchanger exhanst gas outlet 104 is connected with first order recuperation of heat smoke inlet 301, and first order recuperation of heat exhanst gas outlet 305 is connected with subordinate recuperation of heat smoke inlet ..., N level recuperation of heat exhanst gas outlet 505 communicates with the external world; N level recuperation of heat air intake 510 communicates with the external world, and N level recuperation of heat air outlet slit 511 is connected with higher level's recuperation of heat air intake ..., first order recuperation of heat air outlet slit 311 is connected with boiler air entrance 202; First order recuperation of heat drainpipe 309 is connected with subordinate recuperation of heat water leg ..., N level recuperation of heat drainpipe 509 is connected with N level shower water entrance 502 and communicates with the external world; The first order shower water entrance 302 of described first order heat reclamation device 3 is connected with external water source; Described first order flue gas-air heat exchanger 304 ..., the bottom of N level flue gas-air heat exchanger 504 all has the solidifying water discharge gradient; First order flue gas-air heat exchanger 304 ..., N level flue gas-air heat exchanger 504 is as cross-flow heat exchanger, contra-flow heat exchanger or down-stream heat exchanger.
Multistage external Water spray boiler smoke degree of depth recuperation of heat running provided by the utility model is adopted to be: for first order flue gas-air heat exchanger 304, N level flue gas-air heat exchanger 504, flue gas is in internal flow, and air is in flows outside, and shower water is at air side shower humidification, at first order heat reclamation device 3,, all form a kind of flue gas, air and shower water three process of fluid streams heat and mass in N level heat reclamation device 5, this running specifically comprises the steps:
1) flue gas of the boiler flue gas outlet 201 of described boiler 2 is sent in flue gas-backwater heat exchanger 1 through backwater heat exchanger smoke inlet 103, from backwater heat exchanger exhanst gas outlet 104 discharges after carrying out heat exchange with the secondary net backwater flowed into from a secondary net backwater entrance 101; Flow out through a secondary net backwater outlet 102 after one secondary net backwater absorbs the heat of flue gas, and send into boiler 2 by boiler blow-down water mouth 203, be heated to temperature required after give heat user from boiler hot-water outlet 204; Flue gas is under the cooling of a secondary net backwater, and the solidifying water condensed out is collected to backwater heat exchanger and coagulates tank 105, and discharges through backwater heat exchanger discharge outlet 106;
2) for flue gas recirculation: the flue gas of being discharged by backwater heat exchanger exhanst gas outlet 104 enters first order heat reclamation device 3 through first order recuperation of heat smoke inlet 301, and at first order flue gas-air heat exchanger 304 flows downward inside, then subordinate's recuperation of heat smoke inlet is flowed to through first order recuperation of heat exhanst gas outlet 305, then N level recuperation of heat smoke inlet 501 is flowed to, and at N level flue gas-air heat exchanger 504 flows downward inside, after the recuperation of heat of N level, flue gas finally from N level recuperation of heat exhanst gas outlet 505 discharged to outdoor or smoke evacuation purifying processing device,
3) air is circulated: outside air enters N level heat reclamation device 5 from N level recuperation of heat air intake 510, and N level flue gas-air heat exchanger 504 externally on flowing, then subordinate's recuperation of heat air intake is flowed to through N level recuperation of heat air outlet slit 511, then first order recuperation of heat air intake 310 is flowed to, and first order flue gas-air heat exchanger 304 externally on flowing, after the recuperation of heat of N level, air finally flows out from first order recuperation of heat air outlet slit 311, and sends in boiler 2 combustion-supporting through boiler air entrance 202;
4) for spray and solidifying water circulation: external water source (running water, surface water or underground water) manages outer spray through first order nozzle 303 at first order flue gas-air heat exchanger 304, give the air shower humidification upwards flowed, thus improve the equivalent thermal capacitance of air; The condensate water separated out after flue gas release latent heat in first order flue gas-air heat exchanger 304 pipe is pooled in first order flue gas condensed tank 306, then flow in first order recuperation of heat water leg 308 through first order flue gas condensed water pipe 307, arrange 309 through first order recuperation of heat drainpipe after mixing with the shower water fallen and send into subordinate's recuperation of heat water leg,, then flow to N level recuperation of heat water leg 508; The condensate water separated out after flue gas release latent heat in N level flue gas-air heat exchanger 504 pipe is pooled in N level flue gas condensed tank 506, then flow in N level recuperation of heat water leg 508 through N level flue gas condensed water pipe 507, two-way is divided into through N level recuperation of heat drainpipe 509 after mixing with the shower water fallen, one road flows into the spray water source of N level shower water entrance 502 as N level heat reclamation device 5, another road then by unnecessary water discharged to extraneous or draining purifying processing device.
Multistage external Water spray scheme is on the basis of the external Water spray technical scheme of two-stage shown in Fig. 3, and the progression of cascade utilization is more, and double to the recuperation of heat of flue gas, effects of energy saving and emission reduction is better.The external Water spray of single-stage and two-stage external Water spray scheme are all special cases of multistage external Water spray scheme.
Fig. 6 is the structural principle schematic diagram of multi-stage condensing Water spray boiler smoke degree of depth heat reclamation device embodiment of the present utility model, be to adopt the flue gas condensing water in flue gas-backwater heat exchanger 1 as spraying water source with the difference of Fig. 5, be connected with the first order shower water entrance 302 of first order heat reclamation device 3 by described backwater heat exchanger discharge outlet 106, backwater heat exchanger coagulates the flue gas condensing water collected in tank 105 and passes into first order shower water entrance 302 through backwater heat exchanger discharge outlet 106, as the spray water source of first order heat reclamation device 3.Employing flue gas condensing water as the benefit at spray water source is: flue gas condensed water temperature is higher than outer water receiving, easier to the humidification of air.When outdoor air relative humidity is larger, or when winter temperature is lower, generally need to heat air just can complete humidification, and adopt condensed water spray just in time can achieve this end.Single-stage condensed water spray and condensed in two stages Water spray scheme are all special cases of multi-stage condensing Water spray scheme.
Claims (4)
1. a boiler smoke degree of depth heat reclamation device, comprise flue gas-backwater heat exchanger (1) and boiler (2), described flue gas-backwater heat exchanger (1) comprises a secondary net backwater entrance (101), the outlet of secondary net backwater (102), a backwater heat exchanger smoke inlet (103), backwater heat exchanger exhanst gas outlet (104), backwater heat exchanger coagulate tank (105) and backwater heat exchanger discharge outlet (106); Described boiler (2) comprises boiler flue gas outlet (201), boiler air entrance (202), boiler blow-down water mouth (203) and boiler hot-water outlet (204); Described boiler flue gas outlet (201) is connected with backwater heat exchanger smoke inlet (103), one secondary net backwater outlet (102) is connected with boiler blow-down water mouth (203), and backwater heat exchanger coagulates the bottom that tank (105) and backwater heat exchanger discharge outlet (106) are positioned at flue gas-backwater heat exchanger (1);
It is characterized in that: described boiler smoke degree of depth heat reclamation device also comprises the N level heat reclamation device of arranged in series, wherein N >=1; Every grade of heat reclamation device all comprises recuperation of heat smoke inlet, shower water entrance, nozzle, flue gas-air heat exchanger, recuperation of heat exhanst gas outlet, flue gas condensed tank, flue gas condensed water pipe, recuperation of heat water leg, recuperation of heat drainpipe, recuperation of heat air intake and recuperation of heat air outlet slit; In every grade of heat reclamation device, described nozzle, flue gas-air heat exchanger, recuperation of heat water leg and recuperation of heat drainpipe are arranged from top to bottom successively; Flue gas condensed tank and flue gas condensed Guan Shui are arranged in the bottom of flue gas-air heat exchanger successively;
Backwater heat exchanger exhanst gas outlet (104) is connected with first order recuperation of heat smoke inlet, and every grade of recuperation of heat exhanst gas outlet is connected with subordinate recuperation of heat smoke inlet, and N level recuperation of heat exhanst gas outlet communicates with the external world; Every grade of recuperation of heat air intake is connected with subordinate recuperation of heat air outlet slit;
N level recuperation of heat air intake communicates with the external world, and first order recuperation of heat air outlet slit is connected with boiler air entrance (202); Every grade of recuperation of heat drainpipe is connected with subordinate recuperation of heat water leg, and N level recuperation of heat drainpipe communicates with the external world, and every grade of recuperation of heat drainpipe after first order heat reclamation device is also connected with the shower water entrance of the corresponding levels.
2. a kind of boiler smoke degree of depth heat reclamation device according to claim 1, is characterized in that: the first order shower water entrance of the N level heat reclamation device of described arranged in series is connected with external water source or backwater heat exchanger discharge outlet (106); Described external water source is running water, surface water or underground water.
3. a kind of boiler smoke degree of depth heat reclamation device according to claim 1, is characterized in that: all have the solidifying water discharge gradient bottom the flue gas-air heat exchanger in every grade of heat reclamation device.
4. a kind of boiler smoke degree of depth heat reclamation device according to claim 1, is characterized in that: the flue gas-air heat exchanger in every grade of heat reclamation device adopts cross-flow heat exchanger, contra-flow heat exchanger or down-stream heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420430664.7U CN204084324U (en) | 2014-07-31 | 2014-07-31 | A kind of boiler smoke degree of depth heat reclamation device |
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| CN201420430664.7U CN204084324U (en) | 2014-07-31 | 2014-07-31 | A kind of boiler smoke degree of depth heat reclamation device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104110675A (en) * | 2014-07-31 | 2014-10-22 | 清华大学 | Deep heat recovery device and deep heat recovery method for boiler smoke |
| CN109915845A (en) * | 2017-12-12 | 2019-06-21 | 埃尔微尘科技（北京）有限公司 | A kind of flue gas waste heat recovery and purification system |
| CN111256159A (en) * | 2020-01-21 | 2020-06-09 | 山东大学 | Heat exchanger, heat exchange system and method for deep recovery of flue gas waste heat of gas-fired boiler |
-
2014
- 2014-07-31 CN CN201420430664.7U patent/CN204084324U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104110675A (en) * | 2014-07-31 | 2014-10-22 | 清华大学 | Deep heat recovery device and deep heat recovery method for boiler smoke |
| CN104110675B (en) * | 2014-07-31 | 2016-01-13 | 清华大学 | A kind of boiler smoke degree of depth heat reclamation device and method |
| CN109915845A (en) * | 2017-12-12 | 2019-06-21 | 埃尔微尘科技（北京）有限公司 | A kind of flue gas waste heat recovery and purification system |
| CN111256159A (en) * | 2020-01-21 | 2020-06-09 | 山东大学 | Heat exchanger, heat exchange system and method for deep recovery of flue gas waste heat of gas-fired boiler |
| CN111256159B (en) * | 2020-01-21 | 2021-04-30 | 山东大学 | Heat exchanger, heat exchange system and method for deep recovery of flue gas waste heat of gas-fired boiler |
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