CN217057591U - Boiler outlet flue gas waste heat recovery system - Google Patents
Boiler outlet flue gas waste heat recovery system Download PDFInfo
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- CN217057591U CN217057591U CN202220533195.6U CN202220533195U CN217057591U CN 217057591 U CN217057591 U CN 217057591U CN 202220533195 U CN202220533195 U CN 202220533195U CN 217057591 U CN217057591 U CN 217057591U
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- flue gas
- demineralized water
- boiler
- heat
- recovery system
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Abstract
The utility model discloses a boiler outlet flue gas waste heat recovery system, which comprises a phase change heat exchanger, a heat absorption section and a heat release section; the air inlet structure is connected with the air inlet of the heat release section; the air preheater is connected with an air outlet of the heat release section; the boiler flue gas connecting pipe is used for connecting a boiler flue gas outlet and a flue gas inlet of the heat absorption section; still include the demineralized water pipeline, and with the steam pocket that the demineralized water pipeline links to each other, the demineralized water export of steam pocket with the demineralized water entry linkage of heat absorption section, the demineralized water export of heat absorption section the utility model provides a boiler export flue gas waste heat recovery system, it can effectively retrieve the flue gas waste heat, through setting up the required cold wind of section heating boiler that gives heat to utilize the required boiler of this part heat heating boiler to give water, avoided the energy waste, realize energy saving and emission reduction.
Description
Technical Field
The utility model relates to a combined heat and power generation engineering technical field, concretely relates to boiler outlet flue gas waste heat recovery system.
Background
The steam exhaust of smoke pollutants discharged by domestic thermal power plant boilers requires 'ultra-low discharge', the recommended mode of the flue gas desulfurization treatment system after the boiler is limestone-gypsum wet desulfurization, the wet desulfurization requires that the temperature of a flue gas inlet is 90-110 ℃ and is far lower than the temperature of the flue gas discharged by the boiler by 140 ℃, and the flue gas of various thermal power plants needs to be sprayed with water to reduce the temperature in front of a desulfurization tower, so that great waste is caused.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved by the utility model
The technical problem to the waste heat in the boiler waste gas not effectively utilized, the utility model provides a boiler outlet flue gas waste heat recovery system, it can effectively retrieve the flue gas waste heat, through setting up the required primary cold wind of hot section heating boiler to utilize this part heat to heat the required boiler feed water of boiler, avoided the energy waste, realize energy saving and emission reduction.
2. Technical scheme
In order to solve the above problem, the utility model provides a technical scheme does:
a boiler outlet flue gas waste heat recovery system comprises a phase change heat exchanger, a heat absorption section and a heat release section; the air inlet structure is connected with the air inlet of the heat release section; the air preheater is connected with the air outlet of the heat release section; the boiler flue gas connecting pipe is used for connecting a boiler flue gas outlet and a flue gas inlet of the heat absorption section; still include the demineralized water pipeline, and with the steam pocket that the demineralized water pipeline links to each other, the demineralized water export of steam pocket with the demineralized water entry linkage of heat absorption section, the demineralized water export of heat absorption section with the demineralized water entry linkage of heat release section, the demineralized water export of heat release section with the demineralized water entry linkage of steam pocket.
Optionally, the steam drum further comprises a deaerator connected with the steam drum.
Optionally, the system further comprises a bag-type dust collector connected with the smoke outlet of the heat absorption section.
Optionally, a water inlet regulating valve group for controlling the flow rate of the demineralized water is arranged on the demineralized water pipeline.
Optionally, the system further comprises a monitoring structure for monitoring the circulation state of the desalted water, and the monitoring structure is electrically connected with the water inlet regulating valve group.
Optionally, the monitoring structure comprises a number of flow meters and pressure valves distributed over the circulation path of the desalinated water.
Optionally, the air inlet structure is mounted on a fan on a pipeline connected with an air inlet of the heat release section.
Optionally, the air inlet structure is a first fan blade installed in a pipeline connected with an air inlet of the heat release section, a second fan blade is installed in a pipeline connected with a flue gas outlet of the heat absorption section, a first worm wheel is fixedly installed on the first fan blade, a second worm wheel is fixedly installed on the second fan blade, and the first worm wheel and the second worm wheel are in transmission connection through a worm.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:
the boiler outlet flue gas waste heat recovery system can effectively recover flue gas waste heat, and can be used for heating primary cold air required by a boiler by arranging the heat release section and feeding water to the boiler required by the boiler by utilizing the part of heat, so that energy waste is avoided, and energy conservation and emission reduction are realized.
Drawings
Fig. 1 is a schematic structural diagram of a boiler outlet flue gas waste heat recovery system provided by an embodiment of the present invention;
1. a heat absorption section; 2. a heat release section; 3. an air preheater; 4. a boiler flue gas connecting pipe; 5. a demineralized water conduit; 6. a steam drum; 7. a deaerator; 8. a bag-type dust collector; 9. a water inlet regulating valve group; 10. an air inlet structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered to be "fixedly connected" to another element, the two elements may be fixed by way of detachable connection, or may be fixed by way of non-detachable connection, such as sleeving, clamping, integrally-formed fixing, welding, etc., which can be implemented in the prior art, and is not cumbersome. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The references to "first" and "second" in the present invention do not denote any particular quantity or order, but rather are merely used to distinguish one name from another.
With reference to fig. 1, the boiler outlet flue gas waste heat recovery system of the present embodiment includes a phase change heat exchanger, which includes a heat absorption section 1 and a heat release section 2, wherein media in the heat absorption section 1 and the heat release section 2 can exchange heat with each other; the air inlet structure 10 is connected with an air inlet of the heat release section 2 and used for introducing cold air into the heat release section 2 for preheating, in the embodiment, the air inlet structure 10 is arranged on a fan on a pipeline connected with the air inlet of the heat release section 2; the air preheater 3 is connected with the air outlet of the heat release section 2, and cold air preheated by the heat release section 2 enters the air preheater 3 for secondary heating and then is introduced into the boiler for use; the boiler flue gas connecting pipe 4 is used for connecting a boiler flue gas outlet and a flue gas inlet of the heat absorption section 1, so that flue gas exhausted from a boiler can enter the heat absorption section 1 through the boiler flue gas connecting pipe 4, and waste heat of the boiler flue gas is recovered; also comprises a desalted water pipeline 5 and a steam drum 6 connected with the desalted water pipeline 5, one end of the desalted water pipeline 5 is connected with a desalted water supply end, so that the demineralized water can enter the steam drum 6 through the demineralized water pipeline 5, the demineralized water outlet of the steam drum 6 is connected with the demineralized water inlet of the heat absorption section 1, the demineralized water outlet of the heat absorption section 1 is connected with the demineralized water inlet of the heat release section 2, the demineralized water outlet of the heat release section 2 is connected with the demineralized water inlet of the steam drum 7, the demineralized water in the steam drum 6 flows back to the steam drum 6 after sequentially passing through the heat absorption section 1 and the heat release section 2, the demineralized water can absorb a large amount of heat from boiler flue gas in the heat absorption section 1 and release a part of heat in the heat release section 2 for heating cold air, the rest heat is taken back to the steam drum by the demineralized water, and steam-water separation is completed in the steam drum to obtain low-pressure saturated steam.
The boiler outlet flue gas waste heat recovery system can effectively recover flue gas waste heat, primary cold air required by the boiler is heated by the heat release section 2, boiler water required by the boiler is heated by the heat of the primary cold air, energy waste is avoided, and energy conservation and emission reduction are realized.
As the utility model discloses an alternative, still include with deaerator 7 that steam pocket 6 links to each other, through the waste heat of the recoverable demineralized water of deaerator 7, improve system energy utilization and economic nature, under the condition that the running cost is unanimous basically, increased economic benefits, provide economic guarantee for reducing the heat supply price and better serving in hot user.
As the utility model discloses an alternative, still include with the sack cleaner 8 that the exhanst gas outlet of heat absorption section 1 links to each other, sack cleaner 8 is applicable to the entrapment and is tiny, dry, non-fibrous dust to make the boiler flue gas of the low flue gas of low temperature through sack cleaner 8 can directly discharge in the atmosphere.
As an alternative of the present invention, the demineralized water pipeline 5 is provided with a water inlet regulating valve group 9 for controlling the flow rate of the demineralized water, and a monitoring structure for monitoring the circulation state of the demineralized water, the monitoring structure is electrically connected to the water inlet regulating valve group 9, the monitoring structure comprises a plurality of flow meters and pressure valves, the plurality of flow meters and the pressure valves are distributed on the circulation path of the demineralized water, specifically, the plurality of flow meters and the pressure valves are distributed on a plurality of pipelines through which the demineralized water flows, the working state of the water inlet regulating valve group 9 is timely adjusted according to the flow rate and the pressure change of the demineralized water, after the leakage of the demineralized water is determined, the system automatically turns off the electric valves, the whole waste heat recovery system is in an off-line state, and an alarm signal is fed back to an operator in a control room; the change that boiler flue gas volume leads to because of boiler load fluctuation has been solved, realizes system intellectuality, full-automatic safe operation, automatic off-line and alarm maintenance when breaking down.
In other embodiments, the air intake structure 10 is a first fan blade installed in a pipeline connected to the air inlet of the heat release section 2, a second fan blade is installed in a pipeline connected to the flue gas outlet of the heat absorption section 1, a first worm wheel is fixedly installed on the first fan blade, a second worm wheel is fixedly installed on the second fan blade, the first worm wheel and the second worm wheel are connected through a worm, when the boiler flue gas passes through the pipeline connected to the flue gas outlet of the heat absorption section 1, the second fan blade is driven to rotate, the first fan blade in the pipeline connected to the flue gas outlet of the heat absorption section 1 is driven to rotate through the cooperation between the worm wheel and the worm, so that the purpose of air intake is achieved, the balance between the exhaust amount of the flue gas and the intake amount of cold air can be ensured, the air pressure in the boiler is further balanced, and on the basis, a motor for driving the worm to rotate can be provided, thereby through the discharge amount of this motor simultaneous control flue gas and the entering volume of cold wind, on this basis, in order to guarantee bigger intake, can additionally set up a fan.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (8)
1. The utility model provides a boiler outlet flue gas waste heat recovery system which characterized in that: comprises that
The phase change heat exchanger comprises a heat absorption section and a heat release section;
the air inlet structure is connected with the air inlet of the heat release section;
the air preheater is connected with the air outlet of the heat release section;
the boiler flue gas connecting pipe is used for connecting a boiler flue gas outlet and a flue gas inlet of the heat absorption section;
still include demineralized water pipeline, and with the steam pocket that the demineralized water pipeline links to each other, the demineralized water export of steam pocket with the demineralized water entry linkage of heat absorption section, the demineralized water export of heat absorption section with the demineralized water entry linkage of heat release section, the demineralized water export of heat release section with the demineralized water entry linkage of steam pocket.
2. The boiler outlet flue gas waste heat recovery system according to claim 1, characterized in that: the steam drum is characterized by also comprising a deaerator connected with the steam drum.
3. The boiler outlet flue gas waste heat recovery system according to claim 1, characterized in that: and the bag-type dust collector is connected with the smoke outlet of the heat absorption section.
4. The boiler outlet flue gas waste heat recovery system according to claim 1, characterized in that: and the demineralized water pipeline is provided with a water inlet regulating valve group for controlling the flow of the demineralized water.
5. The boiler outlet flue gas waste heat recovery system according to claim 4, characterized in that: the system also comprises a monitoring structure for monitoring the circulation state of the demineralized water, and the monitoring structure is electrically connected with the water inlet regulating valve group.
6. The boiler outlet flue gas waste heat recovery system according to claim 5, characterized in that: the monitoring structure comprises a plurality of flow meters and pressure valves, and the flow meters and the pressure valves are distributed on the circulation path of the demineralized water.
7. The boiler outlet flue gas waste heat recovery system according to any one of claims 1 to 6, characterized in that: the air inlet structure is arranged on a fan on a pipeline connected with an air inlet of the heat release section.
8. The boiler outlet flue gas waste heat recovery system according to any one of claims 1 to 6, characterized in that: the air inlet structure is a first fan blade arranged in a pipeline connected with an air inlet of the heat release section, a second fan blade is arranged in a pipeline connected with a flue gas outlet of the heat absorption section, a first worm wheel is fixedly arranged on the first fan blade, a second worm wheel is fixedly arranged on the second fan blade, and the first worm wheel and the second worm wheel are in transmission connection through a worm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220533195.6U CN217057591U (en) | 2022-03-11 | 2022-03-11 | Boiler outlet flue gas waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220533195.6U CN217057591U (en) | 2022-03-11 | 2022-03-11 | Boiler outlet flue gas waste heat recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217057591U true CN217057591U (en) | 2022-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220533195.6U Active CN217057591U (en) | 2022-03-11 | 2022-03-11 | Boiler outlet flue gas waste heat recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217057591U (en) |
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2022
- 2022-03-11 CN CN202220533195.6U patent/CN217057591U/en active Active
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