CN210569198U - Device for heating air for denitration pyrolysis furnace by using regenerative heating - Google Patents
Device for heating air for denitration pyrolysis furnace by using regenerative heating Download PDFInfo
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- CN210569198U CN210569198U CN201921285022.1U CN201921285022U CN210569198U CN 210569198 U CN210569198 U CN 210569198U CN 201921285022 U CN201921285022 U CN 201921285022U CN 210569198 U CN210569198 U CN 210569198U
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Abstract
The utility model discloses an utilize device of backheating heating denitration furnace wind for stove relates to the power plant field, including oxygen-eliminating device, No. 5 heat exchangers, diversion pipeline, booster pump, defeated steam conduit, A9 steam heater, high-grade steam conduit, A6 steam heater, low-grade steam conduit, steam turbine, flow control valve, denitration pyrolysis furnace, bypass baffle, electric heater unit. The utility model discloses only utilize backheat heating denitration air for the pyrolysis oven, reduced energy consumption and cost.
Description
Technical Field
The utility model relates to a power plant field especially relates to an utilize device of backheat heating denitration air for pyrolysis furnace.
Background
The heating technology of the SCR denitration device of the power plant is divided into two main types according to the heat exchange mode: namely indirect heat exchange and direct heat exchange. The main representative techniques of indirect heat exchange are: rotary, tubular, heat pipe, steam heater, etc. The main representative techniques of direct heat exchange are: hot secondary air mixing heating, direct gas heating, hot air mixing heating and the like.
At present, urea used by an SCR denitration device of a power plant adopts a pyrolysis method, hot air of the urea is from a hot air side behind a primary air preheater and enters a pyrolysis furnace after being heated by a steam heater and an electric heating device, a large amount of fuel or electric energy is consumed, and the energy consumption is high.
Therefore, those skilled in the art are dedicated to develop a device for using air for a regenerative heating denitration pyrolysis furnace, and a steam heater is used for replacing an electric heating device, so that the high operation cost generated by power consumption of the electric heating device is reduced, and the problem of large energy consumption under the prior art is solved.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem of how to reduce the energy resource consumption of heating denitration pyrolysis furnace wind in-process, and then reduce the power consumptive produced high-priced operation cost of electric heater unit.
In order to achieve the purpose, the utility model provides a device for utilizing air for a regenerative heating denitration pyrolysis furnace, which comprises a deaerator, a No. 5 heat exchanger, a water diversion pipeline, a booster pump, a steam transmission pipeline, an A9 steam heater, a high-grade steam pipeline, an A6 steam heater, a low-grade steam pipeline, a steam turbine, a flow regulating valve, a denitration pyrolysis furnace, a bypass baffle and an electric heating device; wherein, the No. 5 heat exchanger adopts a low-pressure heat exchanger; a circulation loop is formed among the deaerator, the No. 5 heat exchanger, the water conduit and the booster pump; the No. 5 heat exchanger, the A6 steam heater, the A9 steam heater and the denitration pyrolysis furnace are sequentially connected in series through the steam conveying pipeline.
Furthermore, the No. 5 heat exchanger is a No. 5 heat exchanger which numbers the heat exchanger according to the flow direction of the working medium.
Furthermore, the water conduit is connected with the deaerator and the No. 5 heat exchanger and used for conveying deaerated feed water and realizing circulation of deaerated feed water between the deaerator and the No. 5 heat exchanger.
Further, the A9 steam heater is a steam-air heater, and the hot primary air required by the process is obtained by utilizing the principle that the primary air is heated by heat exchange between high-grade steam and the primary air.
Further, the A6 steam heater is a steam-air heater, and the cascade utilization of energy is realized by utilizing the principle that low-grade steam and primary air exchange heat to heat primary air.
Further, the steam turbine is configured to extract high grade steam to the A9 steam heater, while the steam turbine is simultaneously configured to extract low grade steam to the A6 steam heater.
Further, the pipe diameter of the water conduit is determined according to the flow of the deoxygenation water supply, the pipe wall thickness of the water conduit is determined according to the pressure of the deoxygenation water supply, and the water conduit and the steam transmission pipeline are made of the same material.
Further, the pipe diameter of the high-grade steam pipeline is determined according to the flow of high-grade steam, the pipe wall thickness of the high-grade steam pipeline is determined according to the pressure of the high-grade steam, and the high-grade steam pipeline and the steam transmission pipeline are made of the same material.
Further, the pipe diameter of the low-grade steam pipeline is determined according to the flow of low-grade steam, the pipe wall thickness of the low-grade steam pipeline is determined according to the pressure of the low-grade steam, and the low-grade steam pipeline and the steam transmission pipeline are made of the same material.
Further, all the connection relations are connected by welding.
In a preferred embodiment of the present invention, a circulation loop is formed between the deaerator, the heat exchanger No. 5, the water conduit, and the booster pump, the water conduit is connected to the deaerator and the heat exchanger No. 5, and is used to convey deaerated feed water, so as to realize circulation of the deaerated feed water between the deaerator and the heat exchanger No. 5, and the heat exchanger No. 5 is used to heat air for the denitration pyrolysis furnace, and the air flows back to the deaerator after heat exchange, which is more energy-saving than heating by electric heating or regenerative heating and electric heating; and the deaerated feed water led out from the deaerator outlet is used as a heating medium to exchange heat with primary air, so that the deaerator has a lower grade of high-grade steam extracted by the steam turbine and a better energy-saving effect compared with the heating of low-grade steam extracted by the steam turbine.
In another preferred embodiment of the present invention, the present invention provides a device and a method for heating air for a denitration pyrolysis furnace by using a regenerative heater, which are improved from the existing structure of the air system of the denitration pyrolysis furnace in the conventional power plant, without using an electric heating device or a combination device of regenerative heating and electric heating; the utility model adopts the indirect heat exchange technology, and can adopt the combination of different devices such as hot primary air or hot secondary air and an electric heating device according to the difference of the device installation device through the prior art; the utility model discloses a steam-air heater, the rotary air heater that need not flow through of wind, the flying dust that rotary air heater carried can be avoided with wind to denitration pyrolysis oven.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic structural view of an air system for a conventional denitration pyrolysis furnace, which uses an apparatus for backheating and heating air for a denitration pyrolysis furnace according to a preferred embodiment of the present invention;
fig. 2 is a structural schematic diagram of an air system for a denitration pyrolysis furnace, which is modified by the device for backheating, heating and denitration pyrolysis furnace, according to a preferred embodiment of the present invention.
The system comprises a deaerator 1, a heat exchanger 2-5, a water guide pipeline 3, a booster pump 4, a steam transmission pipeline 5, a steam heater 6-A9, a high-grade steam pipeline 7, a steam heater 8-A6, a low-grade steam pipeline 9, a steam turbine 10, a flow regulating valve 11, a denitration pyrolysis furnace 12, a bypass baffle 13, an electric heating device 14 and a rotary air preheater 15.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly understood and appreciated by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
As shown in fig. 1, the conventional denitration pyrolysis furnace in the conventional power plant uses a wind structure arrangement, and according to the difference of the equipment installation device, a combination of different equipment such as a hot primary wind or a hot secondary wind and an electric heating device is generally adopted.
As shown in fig. 2, the device for heating air for a denitration pyrolysis furnace by using regenerative heating comprises a deaerator 1, a heat exchanger No. 5 2, a water conduit 3, a booster pump 4, a steam delivery conduit 5, an a9 steam heater 6, a high-grade steam conduit 7, an a6 steam heater 8, a low-grade steam conduit 9, a steam turbine 10, a flow control valve 11, a denitration pyrolysis furnace 12, a bypass baffle 13 and an electric heating device 14. Wherein, the No. 5 heat exchanger 2 adopts a low-pressure heat exchanger; a circulation loop is formed among the deaerator 1, the heat exchanger 2 No. 5, the water conduit 3 and the booster pump 4, and the heat exchanger 2 No. 5, the steam heater 8A 6, the steam heater 6A 9 and the denitration pyrolysis furnace 12 are sequentially connected in series through the steam conduit 5.
As shown in fig. 1 and 2, fig. 2 is based on the structure of the air system for the existing denitration pyrolysis furnace in fig. 1, and other heating measures are not needed, a water conduit 3 is added on an outlet pipeline of a deaerator 1 to serve as a branch pipeline, deaerated water supply is introduced into a heat exchanger 2 No. 5, a heat exchange process of deaerated water supply and cold primary air is carried out in the heat exchanger 2 No. 5, the cold primary air is heated to a required temperature, deaerated water supply after heat exchange is pumped back to the deaerator 1 through a booster pump 4, and the circular flow of the deaerated water supply and the heating process of the cold primary air are completed.
As shown in fig. 2, in order to reach the hot air temperature required by the denitration pyrolysis furnace process and further increase the primary air temperature, an a9 steam heater 6 is additionally arranged on the steam transmission pipeline 5 behind the No. 5 heat exchanger, high-grade steam extracted by a steam turbine 10 is introduced into the a9 steam heater 6 through a high-grade steam pipeline 7, heat exchange between the high-grade steam and the primary air is performed in the a9 steam heater 6, and the primary air is further heated to the hot air temperature required by the pyrolysis furnace process. In order to reduce the usage amount of high-grade steam extracted by the steam turbine 10, an A6 steam heater 8 is arranged between the No. 5 heat exchanger 2 and the A9 steam heater 6, low-grade steam extracted by the steam turbine 10 is introduced into the A6 steam heater 8 through a low-grade steam pipeline 9, and heat exchange between the low-grade steam and primary air is carried out in the A6 steam heater 8, so that the loss amount of the high-grade steam is reduced, and the cascade utilization of energy is realized.
As shown in fig. 2, the pipe diameter of the water conduit 3 at the outlet of the deaerator 1 is selected according to the flow of deaerated water supply led out by the deaerator 1, the pipe wall thickness of the water conduit 3 is selected according to the pressure of deaerated water supply, and the material of the water conduit 3 is the same as that of the steam transmission pipeline 5. The diversion pipeline 3 is provided with a flow regulating valve 11 for regulating the flow of the deoxygenated water supply, the flow regulating valve 11 is selected to be matched with the diversion pipeline 3, and a proper booster pump 4 is selected according to the flow of the deoxygenated water supply. In a circulation loop consisting of a deaerator 1, a No. 5 heat exchanger 2, a water conduit 3, a flow regulating valve 11 and a booster pump 4, the joints are all welded.
As shown in fig. 2, the pipe diameter of the high-grade steam pipe 7 is selected according to the flow rate of high-grade steam extracted by the steam turbine 10, and the pipe diameter of the low-grade steam pipe 9 is selected according to the flow rate of low-grade steam extracted by the steam turbine 10; selecting the pipe wall thickness of the high-grade steam pipeline 7 according to the pressure of the high-grade steam, and selecting the pipe wall thickness of the low-grade steam pipeline 9 according to the pressure of the low-grade steam; the material selection of the high-grade steam pipeline 7 and the low-grade steam pipeline 9 is the same as that of the steam transmission pipeline 5. A flow regulating valve 11 is arranged on the high-grade steam pipeline 7 and used for regulating the flow of the high-grade steam, and the flow regulating valve 11 is selected to be matched with the high-grade steam pipeline 7; a flow regulating valve 11 is arranged on the low-grade steam pipeline 9 and used for regulating the flow of the low-grade steam, and the flow regulating valve 11 is selected to be matched with the low-grade steam pipeline 9. In the connection relation formed by the No. 5 heat exchanger 2, the A6 steam heater 8, the A9 steam heater 6 and the steam turbine 10, the connection parts are all welded.
As shown in fig. 2, a bypass baffle 13 is additionally arranged on the steam delivery pipeline 5 between the a9 steam heater 6 and the denitration pyrolysis furnace 12, the bypass baffle 13 is connected in parallel with the electric heating device 14 in the original system structure, and after the bypass baffle 13 is communicated, the electric heating device 14 can be withdrawn for operation, so that the energy consumption of the electric heating device 14 in the system is reduced. The primary air in the original system structure is heated to the temperature required by the denitration pyrolysis furnace process after passing through the indirect heat exchange process of the No. 5 heat exchanger 2, the A6 steam heater 8 and the A9 steam heater 6 in sequence, and is directly conveyed into the denitration pyrolysis furnace 12 through the steam conveying pipeline 5, so that the primary air does not need to pass through the rotary air preheater 15 in the original system structure, and the air for the denitration pyrolysis furnace 12 is ensured to avoid fly ash carried by the rotary air preheater 15.
It is further explained that, the utility model discloses a structural transformation of 12 wind systems of current denitration pyrolysis oven of conventional power plant forms, adopts indirect heat transfer technique, realizes through current technology, according to equipment fixing device's difference, can adopt the combination of different equipment such as hot primary air or hot overgrate air and electric heater unit. The utility model discloses also be applicable to other heating method hot air system equally. The technical method provided by the utility model can be applied to any occasion that needs hot air with a certain temperature. The utility model discloses do not do specific regulation to the valve of system, the user can set up isolated valve and governing valve as required.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A device for heating air for a denitration pyrolysis furnace by using regenerative heating is characterized by comprising a deaerator, a No. 5 heat exchanger, a water diversion pipeline, a booster pump, a steam delivery pipeline, an A9 steam heater, a high-grade steam pipeline, an A6 steam heater, a low-grade steam pipeline, a steam turbine, a flow regulating valve, the denitration pyrolysis furnace, a bypass baffle and an electric heating device; wherein, the No. 5 heat exchanger adopts a low-pressure heat exchanger; a circulation loop is formed among the deaerator, the No. 5 heat exchanger, the water conduit and the booster pump; the No. 5 heat exchanger, the A6 steam heater, the A9 steam heater and the denitration pyrolysis furnace are sequentially connected in series through the steam conveying pipeline.
2. The device for backheating and heating air for the denitration pyrolysis furnace as claimed in claim 1, wherein the No. 5 heat exchanger is a No. 5 heat exchanger which numbers the heat exchanger according to the flow direction of the working medium.
3. The device for using air for the regenerative heating denitration pyrolysis furnace as claimed in claim 1, wherein the water conduit is connected with the deaerator and the heat exchanger No. 5 and is used for conveying deaerated feed water to realize circulation of the deaerated feed water between the deaerator and the heat exchanger No. 5.
4. The apparatus according to claim 1, wherein the a9 steam heater is a steam-air heater, and the hot primary air required by the process is obtained by using the principle that the primary air is heated by exchanging heat between high-grade steam and the primary air.
5. The apparatus according to claim 1, wherein the a6 steam heater is a steam-air heater, and the energy gradient utilization is realized by using the principle of heating primary air by exchanging heat between low-grade steam and primary air.
6. The apparatus for regeneratively heating denitrified pyrolysis furnace air using as claimed in claim 1, wherein said steam turbine is configured to extract high grade steam to said a9 steam heater and said steam turbine is simultaneously configured to extract low grade steam to said a6 steam heater.
7. The apparatus according to claim 1, wherein the diameter of the water conduit is determined according to the flow rate of the deoxygenated water supply, the thickness of the wall of the water conduit is determined according to the pressure of the deoxygenated water supply, and the material of the water conduit is the same as that of the steam conduit.
8. The apparatus according to claim 1, wherein the diameter of the high-grade steam pipe is determined according to the flow rate of high-grade steam, the thickness of the pipe wall of the high-grade steam pipe is determined according to the pressure of the high-grade steam, and the high-grade steam pipe and the steam transmission pipe are made of the same material.
9. The apparatus according to claim 1, wherein the diameter of the low-grade steam pipe is determined according to the flow rate of low-grade steam, the thickness of the pipe wall of the low-grade steam pipe is determined according to the pressure of the low-grade steam, and the low-grade steam pipe and the steam delivery pipe are made of the same material.
10. The apparatus for using regenerative heating for denitration pyrolysis furnace air as claimed in claim 1, wherein all the connections are welded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921285022.1U CN210569198U (en) | 2019-08-09 | 2019-08-09 | Device for heating air for denitration pyrolysis furnace by using regenerative heating |
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| CN201921285022.1U CN210569198U (en) | 2019-08-09 | 2019-08-09 | Device for heating air for denitration pyrolysis furnace by using regenerative heating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110686405A (en) * | 2019-08-09 | 2020-01-14 | 上海外高桥第三发电有限责任公司 | Device and method for using air for regenerative heating denitration pyrolysis furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110686405A (en) * | 2019-08-09 | 2020-01-14 | 上海外高桥第三发电有限责任公司 | Device and method for using air for regenerative heating denitration pyrolysis furnace |
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