CN205316673U - Flue gas degree of depth waste heat recovery system of direct contact formula and wall type combination within a definite time - Google Patents

Flue gas degree of depth waste heat recovery system of direct contact formula and wall type combination within a definite time Download PDF

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Publication number
CN205316673U
CN205316673U CN201620072683.6U CN201620072683U CN205316673U CN 205316673 U CN205316673 U CN 205316673U CN 201620072683 U CN201620072683 U CN 201620072683U CN 205316673 U CN205316673 U CN 205316673U
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Prior art keywords
flue gas
direct contact
spray
water
spray column
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CN201620072683.6U
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王芳
蒋全平
郭伟
陈冲
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NANJING XUANNENG ELECTRICAL POWER TECHNIQUE Co Ltd
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NANJING XUANNENG ELECTRICAL POWER TECHNIQUE Co Ltd
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Abstract

The utility model discloses a flue gas degree of depth waste heat recovery system of direct contact formula and wall type combination within a definite time, include direct contact formula spray set and waste heat water heating device again, direct contact formula spray set includes the spray column, the lower part of spray column is equipped with flue gas inlet, upper portion is equipped with the exhanst gas outlet, the spray column bottom is located flue gas inlet below position and is equipped with the export of waste heat water, last being equipped with of spray assembly remains hot water import, it is equipped with spray assembly to be located the exhanst gas outlet below in the spray column, waste heat water heating device again includes heating pipe set again, be connected with inlet channel and outlet conduit again on the heating pipe set, waste heat water export is connected with heating pipe set inlet channel again, surplus hot water import is connected with waste heat return water pipe. The utility model discloses a residual heat from flue gas is carried out with the mode of recuperative heat exchang combination to the heat transfer of direct contact formula, and exhaust gas temperature can reduce to below the dew point temperature, and the cooling water heatable has the advantage that hot recovery efficiency is high to more than the dew point temperature.

Description

The flue gas degree of depth residual neat recovering system of a kind of direct contact type and the combination of partition formula
Technical field
The utility model relates to a kind of flue gas waste heat recovery system, a kind of for the direct contact type of degree of depth recovery gas fired-boiler fume afterheat and the flue gas degree of depth residual neat recovering system of partition formula combination specifically, belongs to flue gas waste heat recovery technical field.
Background technology
At present adopt gas fuel or renewable energy source to be thermal source, it is distributed in the distributed energy resource system of the supply of cooling, heating and electrical powers of user's end, the energy cascade utilization directly met consumers' demand and energy-saving and emission-reduction can be realized due to it and promoted. The funnel temperature of domestic a large amount of gas fired-boiler, at 70 ~ 120 DEG C, far above envrionment temperature, causes a large amount of heat loss due to exhaust gas, and this kind of heat loss due to exhaust gas can account for the 70% ~ 80% of boiler overall efficiency loss. Therefore, to reduce, flue gas loss is the important method improving gas fired-boiler thermo-efficiency to Mist heat recovering, and how high efficiente callback fume afterheat is the key promoting gas fired-boiler efficiency further. Owing to the fuel used middle overwhelming majority of gas fired-boiler is methane, after burning, in its smoke evacuation, vapour content is higher. During high fume temperature, water vapour a large amount of in flue gas exists all in a gaseous form, and the heat that the water vapour of 1 cubic metre of combustion of natural gas generation is taken away accounts for more than the 10% of Sweet natural gas superior calorific value; If the latent heat of vaporization that flue-gas temperature is reduced to the following recycle-water steam release of dew-point temperature, can greatly improve the efficiency of boiler, considerable amount.
Early stage flue gas waste heat recovery apparatus mainly adopts interchanger heating combustion air or the boiler blow-down water of partition formula, only make use of the aobvious heat of the part of flue gas, can not the latent heat of recycle-water steam, energy-saving effect is not obvious, heat transfer temperature difference is little, cause waste-heat recovery device bulky, economic poor performance, apply limited.
Also there is a kind of spray-type direct contact type flue gas recovery device in prior art, a kind of contact flue gas waste heat recovery system is disclosed as publication number to be CN102168888A, publication date be August 31 in 2011 day, are called in the Chinese invention patent of " a kind of contact-type advanced recycling system for waste heat of low-temperature flue gas ", water coolant is directly sprayed to drench with flue gas and mixes by this system, flue-gas temperature is made to be down to below dew-point temperature, the aobvious heat of flue gas and the latent heat of vaporization of water vapour discharge and are heated by water coolant, and the water coolant finally heated just can carry out heat exchange utilization.Although the latent heat of water vapour in this kind of recyclable flue gas of residual neat recovering system, realize the condensation of flue gas, but require that the temperature of heat exchange surface is lower than flue gas aqueous dew point temperature, namely the temperature of flue gas heat exchange will lower than dew-point temperature, make the water coolant leaving water temperature(LWT) of heating lower like this, limit its range of application. And this residual neat recovering system also needs bigger spray water flow in order to the heat exchange effect reached, this just needs to use high-power water pump and flue gas conveying fan. Thus, this kind of contact fume recovery system of prior art exists that the water coolant leaving water temperature(LWT) of heating is low and the big problem of current consumption.
Publication number to be CN202092207U, publication date be December 28 in 2011 day, are called that the Chinese utility model patent of " the central heating system utilizing absorption heat pump Mist heat recovering " discloses a kind of central heating system utilizing absorption heat pump Mist heat recovering, this system adopts flue gas and water direct contact heat-exchanging, extracts by the heat lift heating system return water temperature of flue gas heating recirculated water in absorption heat pump. This system is combined by multiple distinct portions such as absorption type heat pumping set, spray equipments; The recirculated water leaving water temperature(LWT) of flue gas Direct Contact Heating is lower than dew-point temperature, it is necessary to providing driving-energy to heat pump set, promoted by the energy of this recirculated water, system footprint area is bigger.
Publication number to be CN204373218U, publication date be June 3 in 2015 day, are called in the Chinese utility model patent of " Condensing Gas-fired Boiler with Direct Contact Heat based on air moistening " to disclose a kind of gas fired-boiler, this boiler comprises condensation hot water boiler, spray-type evaporates cooling tower again and direct contact heat retrieving arrangement, by the mode of air moistening, the dividing potential drop of water vapour in the flue gas that fuel gas buring produces is increased, thus improve the method for flue gas dew point, condensation flue gas at relatively high temperatures, to reach the effect improving and adding hot cooling water leaving water temperature(LWT). But the mode adopting air moistening can affect the combustioncharacteristics of boiler, application has certain limitation.
Summary of the invention
The purpose of this utility model is to provide a kind of the degree of depth can reclaim the direct contact type of gas fired-boiler fume afterheat and the flue gas degree of depth residual neat recovering system of partition formula combination, low with the waste heat leaving water temperature(LWT) solving the flue gas waste heat recovery apparatus of prior art and existing, current consumption is big, floor space is big and the technical problem such as application limitation.
The utility model adopts following technical scheme: the flue gas degree of depth residual neat recovering system of a kind of direct contact type and the combination of partition formula, comprise direct contact type spray equipment and remaining hot water reheats device, described direct contact type spray equipment comprises spray column, the bottom of spray column is provided with gas approach, top is provided with exhanst gas outlet, it is positioned in described spray column and below exhanst gas outlet, it is provided with spray assemblies, described spray assemblies is provided with remaining hot water import, it is positioned at the position below gas approach bottom described spray column and it is provided with remaining hot water outlet, described remaining hot water reheats device and comprises and reheat tube bank, described reheat tube bank be positioned at the position above spray column gas approach or be positioned at the flue of gas approach, described reheating is connected with inlet channel and outlet conduit in tube bank, the outlet of described remaining hot water is connected with inlet channel, described remaining hot water import is connected with outlet conduit.
It is lambdoid baffle plate that the top reheating tube bank being positioned at spray column gas approach top position is provided with cross section spaced apart.
The lower section being positioned at spray assemblies in described spray column is provided with packing layer, and the position of packing layer is higher than the position reheating tube bank.
Described inlet channel is provided with recycle pump.
The beneficial effects of the utility model are: the utility model is operationally, flue gas enters in spray column from bottom to top, water coolant sprays into spray column from top to bottom through spray assemblies, flue gas and water coolant carry out direct contact heat transfer, water coolant directly absorbs the heat in flue gas effectively, and the water vapour in condensation flue gas releases Latent heat simultaneously. Flue gas and water coolant adopt spray-type direct contact heat transfer, substantially increase heat exchange efficiency, have fully reclaimed the steam coagulation latent heat in flue gas. After water coolant and smoke contact heat exchange, remaining hot water outlet bottom spray column is discharged and is entered in the inlet channel that remaining hot water reheats device, water coolant be sent to again reheat in tube bank with ingress high-temperature flue gas further heat exchange to comparatively high temps after, the residual heat using device being connected with outlet conduit is entered into again from outlet conduit, temperature of cooling water after being utilized by residual heat using device is down to below dew-point temperature, is again sent in spray assemblies. In fact remaining hot water in the utility model reheats device is a kind of wall-type heat exchange device, in spray column gas approach or in the flue of spray column gas approach arrange reheat tube bank, in spray column, the high-temperature flue gas of water coolant after direct contact heat transfer and gas approach can reheat heat exchange again in tube bank, after heat exchange, the temperature of water coolant after direct contact heat transfer raises further, system utilizes fume afterheat finally to produce the remaining hot water of comparatively high temps, it is to increase efficiency of energy utilization; Remaining hot water again after heat exchange the flue-gas temperature at gas approach place reduce so that the cooling load that spray is drenched reduces, thus can reduce water spray and spray column resistance so that the electric power of water pump and flue gas conveying fan all reduces. Through the flue gas degree of depth residual neat recovering system of the utility model direct contact type and the combination of partition formula, the funnel temperature of high-temperature flue gas finally can be reduced to below flue gas dew point temperature, and temperature of cooling water can be heated to more than dew-point temperature simultaneously. The mode that the utility model adopts direct contact heat transfer and wall-type heat exchange to combine carries out flue gas waste heat recovery, has that heat recovery efficiency height, floor space are little, the advantage of applied range.
Preferably, reheat people's word baffle plate that tube bank top is arranged, spray water can be avoided to restrain with reheating and contact, reduce spray water to the impact reheating effect, and reduce the corrosion reheating tube bank.
Preferably, filler can provide a stable huge contact area to spray water, spray water can comparatively evenly be sprayed on filler, under the effect of gravity and surface tension, spray water evenly spreads at filling surface while trickling downwards and is dispersed on filling surface, flue gas counterflows through in filler, while flue gas and filling surface heat exchange, flue gas middle acid substance is absorbed and neutralization by spray water and spray water neutral and alkali material, heat exchange and assimilation effect can not only be improved, and resistance to flow can be reduced.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is the sectional view of herring-bone baffle plate and heat-exchanging tube bundle in Fig. 1;
Fig. 3 is the structural representation of the utility model embodiment 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment 1:
The structure of the utility model embodiment 1 is as depicted in figs. 1 and 2, the flue gas degree of depth residual neat recovering system of the utility model direct contact type and the combination of partition formula comprises direct contact type spray equipment and remaining hot water reheats device, described direct contact type spray equipment comprises spray column 1, the bottom of spray column 1 is provided with gas approach 11, top is provided with exhanst gas outlet 12, it is positioned in described spray column 1 and below exhanst gas outlet 12, it is provided with spray assemblies 2, described spray assemblies 2 is provided with remaining hot water import 21, it is positioned at gas approach 11 lower position bottom described spray column 1 and it is provided with remaining hot water outlet 22, described remaining hot water reheats device and comprises and reheat tube bank 5, reheat and tube bank 5 is connected with inlet channel 42 and outlet conduit 41, outlet conduit 41 is connected with UTILIZATION OF VESIDUAL HEAT IN system 3, described remaining hot water outlet 22 is connected with inlet channel 42, described remaining hot water import 21 is connected with outlet conduit 41. in the present embodiment, reheat tube bank and 5 it is positioned at the position above spray column 1 gas approach 11, restrain contacting for avoiding spray water with reheating, reheat and restrain that to be also provided with spaced cross section above in the of 5 be lambdoid baffle plate 6. described inlet channel 42 is provided with recycle pump 8, the position that recycle pump 8 exports 22 at remaining hot water and reheats between tube bank 5. in order to improve flue gas heat exchange and assimilated efficiency, reduction smoke flow resistance, the lower section that the present embodiment is positioned at spray assemblies 2 in spray column 1 is provided with packing layer 7, and the position of packing layer 7 is higher than the position reheating tube bank 5 and herring-bone baffle plate 6.
The principle of work of the present embodiment is: gas burning waste heat boiler tail flue gas enters spray column 1 by gas approach 11, flue gas is from bottom to top successively through reheating tube bank 5 and packing layer 7, flue gas first and reheats the water heat exchange restrained in 5, spray the water heat exchange drenched again with spray assemblies 2, finally discharge from exhanst gas outlet 12. Water coolant enters into spray assemblies 2 through outlet conduit 41, from spray assemblies 2, from up to down spray pours in spray column 1 again, it is deposited on bottom spray column 1 after water coolant and flue gas direct contact heat transfer, exporting 22 by remaining hot water is incorporated in the inlet channel 42 reheating device, boost through recycle pump 8, enter and reheat after heat exchange is promoted to comparatively high temps again with the high-temperature flue gas at gas approach place in tube bank 5, send into residual heat using device 3.
In the present embodiment, water coolant first carries out direct contact heat transfer with flue gas, temperature of cooling water is raised, reheat tube bank and entrance high-temperature flue gas heat exchange, the temperature of water coolant raises further, the fume afterheat is finally utilized to produce the remaining hot water of comparatively high temps, it is to increase efficiency of energy utilization. After utilization reheats tube bank heat exchange, input gas temperature reduces so that the cooling load that spray is drenched reduces, thus can reduce water spray and spray column resistance so that the electric power of water pump and flue gas conveying fan all reduces. In fact remaining hot water in the utility model reheats device is a kind of wall-type heat exchange device, through the flue gas degree of depth residual neat recovering system of the utility model direct contact type and the combination of partition formula, the funnel temperature of high-temperature flue gas finally can be reduced to below flue gas dew point temperature, and temperature of cooling water can be heated to more than dew-point temperature simultaneously. The mode that the utility model adopts direct contact heat transfer and wall-type heat exchange to combine carries out flue gas waste heat recovery, has that heat recovery efficiency height, floor space are little, the advantage of applied range.
Embodiment 2:
The structure of the utility model embodiment 2 is as shown in Figure 3, as another kind of specific embodiment of the present utility model, its principle is substantially the same manner as Example 1, difference is only: reheats tube bank and is arranged in the flue of gas approach, in spray column, water coolant after direct contact heat transfer was again heated to comparatively high temps before flue gas enters in spray column, spray water can be avoided like this to affect the effect reheated, and save the herring-bone baffle plate in embodiment 1.
Above-described embodiment is the utility model preferred embodiment, and under the prerequisite not departing from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.

Claims (4)

1. the flue gas degree of depth residual neat recovering system of a direct contact type and the combination of partition formula, it is characterized in that: it comprises direct contact type spray equipment and remaining hot water reheats device, described direct contact type spray equipment comprises spray column (1), the bottom of spray column is provided with gas approach (11), top is provided with exhanst gas outlet (12), it is positioned at exhanst gas outlet (12) lower section in described spray column (1) and it is provided with spray assemblies (2), described spray assemblies (2) is provided with remaining hot water import (21), the position that described spray column (1) bottom is positioned at gas approach (11) lower section is provided with remaining hot water outlet (22), described remaining hot water reheats device and comprises and reheat tube bank (5), described reheat tube bank (5) and it is positioned at the position of spray column (1) gas approach (11) top or is positioned at the flue of gas approach (11), described reheating is connected with inlet channel (42) and outlet conduit (41) in tube bank (5), described remaining hot water outlet (22) is connected with inlet channel (42), described remaining hot water import (21) is connected with outlet conduit (41).
2. the flue gas degree of depth residual neat recovering system of direct contact type according to claim 1 and the combination of partition formula, it is characterised in that: it is lambdoid baffle plate (6) that the top reheating tube bank (5) being positioned at spray column (1) gas approach (11) top position is provided with cross section spaced apart.
3. the flue gas degree of depth residual neat recovering system of direct contact type according to claim 1 and the combination of partition formula, it is characterized in that: the lower section being positioned at spray assemblies (2) in described spray column (1) is provided with packing layer (7), and the position of packing layer (7) is higher than the position reheating tube bank (5).
4. the flue gas degree of depth residual neat recovering system of direct contact type according to claim 1 and the combination of partition formula, it is characterised in that: described inlet channel (42) is provided with recycle pump (8).
CN201620072683.6U 2016-01-26 2016-01-26 Flue gas degree of depth waste heat recovery system of direct contact formula and wall type combination within a definite time Active CN205316673U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106765043A (en) * 2016-12-28 2017-05-31 中国科学院工程热物理研究所 A kind of gas fired-boiler Latent heat recycling system
CN112781237A (en) * 2020-12-30 2021-05-11 华能江阴燃机热电有限责任公司 Waste heat recycling device of power plant boiler

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106765043A (en) * 2016-12-28 2017-05-31 中国科学院工程热物理研究所 A kind of gas fired-boiler Latent heat recycling system
CN112781237A (en) * 2020-12-30 2021-05-11 华能江阴燃机热电有限责任公司 Waste heat recycling device of power plant boiler
CN112781237B (en) * 2020-12-30 2022-08-02 华能江阴燃机热电有限责任公司 Waste heat recycling device of power plant boiler

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