CN207763546U - Gas fired-boiler flue gas waste heat recovery apparatus - Google Patents
Gas fired-boiler flue gas waste heat recovery apparatus Download PDFInfo
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- CN207763546U CN207763546U CN201721684156.1U CN201721684156U CN207763546U CN 207763546 U CN207763546 U CN 207763546U CN 201721684156 U CN201721684156 U CN 201721684156U CN 207763546 U CN207763546 U CN 207763546U
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Abstract
The utility model provides a kind of gas fired-boiler flue gas waste heat recovery apparatus, including：Heat-exchanging component, in closed hoop structure, heat-exchanging component has the condensed water heat exchanging part for exchanging heat with condensed water and the flue gas heat exchange portion for exchanging heat with heat smoke, and heat transfer is provided in heat-exchanging component, and the vapourizing temperature of heat transfer is more than the dew-point temperature of acid vapor in heat smoke；Condensed water heat exchange shell is provided with liquid inlet and liquid outlet, and the setting of condensed water heat exchanging part is in condensed water heat exchange shell；Flue gas heat exchange shell, is provided with smoke inlet and exhanst gas outlet, and flue gas heat exchange portion is arranged in flue gas heat exchange shell.The utility model has the beneficial effects that the utility model embodiment flue-gas temperature be less than dew-point temperature when do not work, can be crossed to avoid acid vapor condensation and caused by etching problem.
Description
Technical field
The utility model is related to steel industry off-gas recovery field, specifically a kind of gas fired-boiler flue gas waste heat recovery dress
It sets.
Background technology
The byproduct generated in Production Process for Steel Enterprise --- combustion gas is a kind of important secondary energy sources, except as just
Often outside production fuel, it will usually with being generated electricity on gas fired-boiler to improve the self power generation rate of enterprise, reduce production and operation at
This.Country puts into effect a series of energy-saving and emission-reduction policies in recent years, and " energy-saving " is not only the needs of enterprise development, to promoting China
Resources for construction economizing type and friendly environment society have very important significance.
It, can be in heat exchanger when flue gas passes through heat exchanger due to containing the ingredients such as sulfur dioxide in iron and steel enterprise's smoke components
Low temperature end surfaces generate acid vapor condensation, to cause steel tube surface acid corrosion.General gas fired-boiler acid corrosion in order to prevent, tail
About 130-140 DEG C of portion's chimney meatus transmitting smoke temperature, gas fired-boiler efficiency is about 89%-90%, except part is taken away in boiler body blowdown
Outside heat, most of heat is in flue gas emission to atmospheric environment.
Application No. is 201210216896.8, the Authorization Notice No. one kind that has been the Introduction To Cn Patent of CN102767822 B
Boiler smoke is classified the integrated system of preheated air and steam turbine condensed water, this scheme by air preheater and air-introduced machine it
Between condensation water heater is set, using fume afterheat heat-setting water, to reduce exhaust gas temperature, reach improve boiler effect
The purpose of rate.Condensation water heater uses direct heat transfer form in this scheme, and condensed water flows through when being restrained in heater, passes through pipe
The heat convection of flue gas and condensed water exchanges heat on wall surface inside and outside beam.
Said program has the disadvantage that：Condensed water uses direct heat transfer form with flue gas, when condensing water temperature is low, solidifying
It is relatively low to bear water heater cold water end fume side tube bank wall surface temperature, the acid vapor in flue gas is easy to cause pipe in tube bank wall surface moisture condensation
Beam corrodes.In addition, the heater is easy to happen leakage, air-introduced machine is caused to be intake, forces the urgent blowing out of boiler.
Utility model content
The utility model provides a kind of gas fired-boiler flue gas waste heat recovery apparatus, to reach the mesh for preventing tube bank from corroding
's.
Technical solution adopted by the utility model to solve its technical problems is：A kind of gas fired-boiler flue gas waste heat recovery dress
It sets, including：Heat-exchanging component, is in closed hoop structure, heat-exchanging component have condensed water heat exchanging part for exchanging heat with condensed water and
Flue gas heat exchange portion for exchanging heat with heat smoke is provided with heat transfer in heat-exchanging component, and the vapourizing temperature of heat transfer is more than
The dew-point temperature of acid vapor in heat smoke；Condensed water heat exchange shell, is provided with liquid inlet and liquid outlet, condensed water heat exchanging part
Setting is in condensed water heat exchange shell；Flue gas heat exchange shell, is provided with smoke inlet and exhanst gas outlet, and the setting of flue gas heat exchange portion exists
In flue gas heat exchange shell.
Further, heat-exchanging component includes the connecting tube of a plurality of parallel interval setting, and one end of a plurality of connecting tube is all connected with
In condensed water heat exchanging part, the other end of a plurality of connecting tube is all connected in flue gas heat exchange portion.
Further, connecting tube is coated with heat insulation layer.
Further, condensed water heat exchanging part is the heat exchanging pipe being arranged in condensed water heat exchange shell.
Further, flue gas heat exchange portion is the heat exchange fin being arranged in flue gas heat exchange shell.
Further, the flow valve for controlling condensate flow is provided at the liquid inlet of condensed water heat exchange shell.
Further, the entrance side of flue gas heat exchange shell and outlet side are both provided with soot blower.
Further, the lower part of flue gas heat exchange shell is provided with cinder catcher.
Further, the top of flue gas heat exchange shell is provided with ash removing opening and soot cleaning valve.
The utility model has the beneficial effects that the utility model embodiment not work when flue-gas temperature is less than dew-point temperature
Make, can be crossed to avoid acid vapor condensation and caused by etching problem.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality
Novel illustrative embodiments and their description are not constituted improper limits to the present invention for explaining the utility model.
In the accompanying drawings：
Fig. 1 is the structural schematic diagram of the utility model embodiment.
Reference numeral in figure：10, heat-exchanging component；11, condensed water heat exchanging part；12, flue gas heat exchange portion；13, connecting tube；20、
Condensed water heat exchange shell；30, flue gas heat exchange shell；31, cinder catcher.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the utility model embodiment provides a kind of gas fired-boiler flue gas waste heat recovery apparatus, including heat exchange
Component 10, condensed water heat exchange shell 20 and flue gas heat exchange shell 30.Heat-exchanging component 10 is in closed hoop structure, and heat-exchanging component 10 has
It is useful for the condensed water heat exchanging part 11 to exchange heat with condensed water and the flue gas heat exchange portion 12 for exchanging heat with heat smoke, heat-exchanging component 10
It is inside provided with heat transfer, the vapourizing temperature of heat transfer (condenses into water droplet more than the dew-point temperature of acid vapor in heat smoke
Temperature).Condensed water heat exchange shell 20 is provided with liquid inlet and liquid outlet, and the setting of condensed water heat exchanging part 11 exchanges heat in condensed water
In shell 20.Flue gas heat exchange shell 30 is provided with smoke inlet and exhanst gas outlet, and flue gas heat exchange portion 12 is arranged in flue gas heat exchange shell
In body 30.
Heat transfer in heat-exchanging component 10 can just undergo phase transition (one when heat smoke temperature reaches a certain temperature spot or more
As refer to heat transfer vapourizing temperature), the diabatic process of entire gas fired-boiler flue gas waste heat recovery apparatus could carry out.Based on changing
The These characteristics of hot component 10 can choose the vapourizing temperature medium higher than acid vapor dew-point temperature in heat smoke as heat exchange group
Heat transfer in part 10.When heat smoke temperature is less than dew-point temperature, gas fired-boiler flue gas waste heat recovery apparatus does not work, cigarette
Gas heat exchange 30 side wall surface temperature of shell is consistent with heat smoke temperature.When heat smoke temperature is higher than dew-point temperature, gas fired-boiler cigarette
Gas waste-heat recovery device is started to work, and 30 side wall surface temperature of flue gas heat exchange shell remains the vapourizing temperature phase with heat transfer
Together, so as to avoid acid corrosion the problem of.
It should be noted that two arrows at the condensed water heat exchange shell 20 being located above in Fig. 1 respectively represent condensation
Water enters condensed water heat exchange shell 20 and condensed water export condensed water heat exchange shell 20.Underlying flue gas heat exchange shell in Fig. 1
Two arrows at body 30 respectively represent heat smoke and enter flue gas heat exchange shell 30 and heat smoke export flue gas heat exchange shell 30.
Heat-exchanging component 10 in the utility model embodiment includes the connecting tube 13 of a plurality of parallel interval setting, a plurality of connection
One end of pipe 13 is both connected in condensed water heat exchanging part 11, and the other end of a plurality of connecting tube 13 is all connected in flue gas heat exchange portion 12.
Utility model
It should be noted that condensed water heat exchanging part 11 is the heat exchanging pipe being arranged in condensed water heat exchange shell 20, this is changed
Pipe line can be that ordinary carbon steel steel pipe can also be stainless-steel pipe.Flue gas heat exchange portion 12 is to be arranged in flue gas heat exchange shell 30
Interior heat exchange fin, the fin are ordinary carbon steel finned tube, for increasing heat exchange area, improve heat exchange efficiency.Outside connecting tube 13
It is coated with heat insulation layer, heat insulation layer is made of heat-insulating material, for preventing heat from leaking.
Further, the flow for controlling condensate flow is provided at the liquid inlet of condensed water heat exchange shell 20
Valve.By controlling the aperture of flow valve, condensing water flow can be controlled, to reach control gas fired-boiler flue gas waste heat recovery dress
The purpose for the heat exchange amount set.
Preferably, the entrance side of flue gas heat exchange shell 30 and outlet side are both provided with soot blower, in order to prevent from changing
Hot fin dust stratification, fouling.The soot blower is the prior art, is not elaborated to the structure of soot blower herein.The utility model
Soot blower in embodiment periodically can carry out soot blowing for heat exchanging fin, such as when gas fired-boiler flue gas waste heat recovery apparatus works
After eight hours, soot blowing operation is carried out using soot blower heat exchanging fin.
In another embodiment, the liquid outlet of condensed water heat exchange shell 20 is provided with temperature sensor, the temperature
Sensor is connected with controller, is set when temperature sensor detects that the liquid outlet temperature of condensed water heat exchange shell 20 is less than
When definite value, soot blower can be controlled by the controller and carry out soot blowing operation.
Further, the lower part of flue gas heat exchange shell 30 is provided with cinder catcher 31.The cinder catcher 31 can collect flue gas and change
Dust in hot shell 30, and the cinder catcher 31 can be dismantled.The utility model can realize on-line automatic purging and deashing,
Reduce labor intensity.
Preferably, the top of flue gas heat exchange shell 30 is provided with ash removing opening and soot cleaning valve.Staff can pass through deashing
Hole and soot cleaning valve carry out manual deashing.
In the utility model embodiment, gas fired-boiler flue gas waste heat recovery apparatus uses split type arrangement, is divided into condensed water
Exchange heat shell 20 and flue gas heat exchange shell 30, is connected using connecting tube 13 between two heat exchange shells, when condensed water side condensed water
Exchange heat shell 20 reveal when, water will not leak into flue gas, avoid because water reveal caused by air-introduced machine (air-introduced machine is connected to flue gas and changes
The smoke outlet of hot shell 30) water inlet the problem of.Using separate structure, when condensed water is revealed, condensed water confession can be cut off
It gives and condensed water heat exchange shell 20 is repaired, but have no effect on air-introduced machine normal work.
Simultaneously as using split structure, the volume of single housing is relatively small, and arrangement is convenient, to cigarette after Boiler Furnace
Road general layout influences small.
It can be seen from the above description that the above embodiments of the present invention achieve the following technical effects：This reality
Do not worked with new embodiment when flue-gas temperature is less than dew-point temperature, can cross condensation to avoid acid vapor and caused by corrode and ask
Topic.
The above, only specific embodiment of the utility model cannot limit the range that utility model is implemented, institute with it
With the displacement of its equivalent assemblies, or according to equivalent variations made by the utility model patent protection domain and modification, should all still fall within
The scope that this patent is covered.In addition, between technical characteristic and technical characteristic in the utility model, technical characteristic and technical solution
Between, between technical solution and technical solution use can be freely combined.
Claims (9)
1. a kind of gas fired-boiler flue gas waste heat recovery apparatus, which is characterized in that including：
Heat-exchanging component (10), is in closed hoop structure, and heat-exchanging component (10) has the condensed water heat exchange for exchanging heat with condensed water
Portion (11) and flue gas heat exchange portion (12) for exchanging heat with heat smoke are provided with heat transfer, the biography in heat-exchanging component (10)
The vapourizing temperature of thermal medium is more than the dew-point temperature of acid vapor in heat smoke；
Condensed water heat exchange shell (20), is provided with liquid inlet and liquid outlet, and condensed water heat exchanging part (11) is arranged in condensed water
It exchanges heat in shell (20)；
Flue gas heat exchange shell (30), is provided with smoke inlet and exhanst gas outlet, and flue gas heat exchange portion (12) are arranged in flue gas heat exchange shell
In body (30).
2. gas fired-boiler flue gas waste heat recovery apparatus according to claim 1, which is characterized in that heat-exchanging component (10) includes
The connecting tube (13) of a plurality of parallel interval setting, one end of a plurality of connecting tube (13) are both connected in condensed water heat exchanging part (11),
The other end of a plurality of connecting tube (13) is all connected in flue gas heat exchange portion (12).
3. gas fired-boiler flue gas waste heat recovery apparatus according to claim 2, which is characterized in that connecting tube (13) outer cladding
There is heat insulation layer.
4. gas fired-boiler flue gas waste heat recovery apparatus according to any one of claim 1 to 3, which is characterized in that condensation
Water heat exchanging part (11) is heat exchanging pipe of the setting in condensed water heat exchange shell (20).
5. gas fired-boiler flue gas waste heat recovery apparatus according to any one of claim 1 to 3, which is characterized in that flue gas
Heat exchanging part (12) is the heat exchange fin being arranged in flue gas heat exchange shell (30).
6. gas fired-boiler flue gas waste heat recovery apparatus according to any one of claim 1 to 3, which is characterized in that condensation
The flow valve for controlling condensate flow is provided at the liquid inlet of water heat exchange shell (20).
7. gas fired-boiler flue gas waste heat recovery apparatus according to any one of claim 1 to 3, which is characterized in that flue gas
The entrance side and/or outlet side of heat exchange shell (30) are provided with soot blower.
8. gas fired-boiler flue gas waste heat recovery apparatus according to any one of claim 1 to 3, which is characterized in that flue gas
The lower part of heat exchange shell (30) is provided with cinder catcher (31).
9. gas fired-boiler flue gas waste heat recovery apparatus according to any one of claim 1 to 3, which is characterized in that flue gas
The top of heat exchange shell (30) is provided with ash removing opening and soot cleaning valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721684156.1U CN207763546U (en) | 2017-12-06 | 2017-12-06 | Gas fired-boiler flue gas waste heat recovery apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721684156.1U CN207763546U (en) | 2017-12-06 | 2017-12-06 | Gas fired-boiler flue gas waste heat recovery apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN207763546U true CN207763546U (en) | 2018-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721684156.1U Active CN207763546U (en) | 2017-12-06 | 2017-12-06 | Gas fired-boiler flue gas waste heat recovery apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107883795A (en) * | 2017-12-06 | 2018-04-06 | 北京京诚科林环保科技有限公司 | Gas fired-boiler flue gas waste heat recovery apparatus |
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2017
- 2017-12-06 CN CN201721684156.1U patent/CN207763546U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107883795A (en) * | 2017-12-06 | 2018-04-06 | 北京京诚科林环保科技有限公司 | Gas fired-boiler flue gas waste heat recovery apparatus |
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