CN106370034A - Flue gas heat exchange system for urea pyrolysis - Google Patents
Flue gas heat exchange system for urea pyrolysis Download PDFInfo
- Publication number
- CN106370034A CN106370034A CN201610781819.5A CN201610781819A CN106370034A CN 106370034 A CN106370034 A CN 106370034A CN 201610781819 A CN201610781819 A CN 201610781819A CN 106370034 A CN106370034 A CN 106370034A
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- China
- Prior art keywords
- air
- heat exchanger
- urea pyrolysis
- built
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a flue gas heat exchange system for urea pyrolysis and relates to a flue gas heat exchange system. By means of the flue gas heat exchange system for urea pyrolysis, the problems that electrical heating schemes are mainly adopted for providing heat sources of hot air which is frequently used for urea pyrolysis heating at present, an electrical heating device is high in power, so that a high-voltage power source needs to be arranged, and an electrical heating method influences the power utilization rate of a factory, is high in investment and maintenance cost and has potential safety hazards are solved. A built-in heat exchanger of the flue gas heat exchange system is arranged on the rear portion of a reversing chamber of a boiler. A cold primary air pipe is connected with the inlet end of the built-in heat exchanger. One end of an air outlet pipe is connected with the outlet end of the built-in heat exchanger, and the other end of the air outlet pipe is connected with a urea pyrolysis furnace. An air conditioning bypass is used for connecting the cold primary air pipe with the air outlet pipe. The flue gas heat exchange system is good in economical efficiency and easy to control.
Description
Technical field
The present invention relates to a kind of smoke heat exchanging system is and in particular to a kind of smoke heat exchanging system for urea pyrolysis.
Background technology
Urea pyrolysis, as a kind of conventional denitration engineering reducing agent preparation method, have substantial amounts of operational performance.But
The thermal source that the urea pyrolysis commonly used at present heat hot blast mainly adopts electrical heating scheme to provide thermal source.Work(due to electric heater unit
Rate is higher, needs to arrange high voltage power supply.Electrical heating method not only affects factory's power consumption rate, and investment maintenance cost is higher, exists
Potential safety hazard.
Content of the invention
Brief overview with regard to the present invention is given below, to provide basic with regard to certain aspects of the invention
Understand.It should be appreciated that this general introduction is not the exhaustive general introduction with regard to the present invention.It is not intended to determine the pass of the present invention
Key or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides some concepts in simplified form,
In this, as the preamble in greater detail discussed after a while.
In consideration of it, according to an aspect of the present invention, it is contemplated that a kind of flue gas heat exchange for urea pyrolysis is proposed
System, the thermal source heating hot blast with the urea pyrolysis solving to commonly use at present mainly adopts electrical heating scheme to provide thermal source, due to electricity
The power of heater is higher, needs to arrange high voltage power supply, electrical heating method not only affects factory's power consumption rate, and investment is safeguarded into
This is higher, there is potential safety hazard.
The scheme that the present invention is taken is: a kind of smoke heat exchanging system for urea pyrolysis, including cold primary air duct,
Air outlet manifold, air adjustment bypass, built-in heat exchanger, boiler and urea pyrolysis stove；Described built-in heat exchanger arrangement
At boiler reversal chamber rear portion, cold primary air duct is connected with the entrance point of built-in heat exchanger, one end of air outlet manifold with
Port of export connection, the other end of air outlet manifold and the urea pyrolysis stove of built-in heat exchanger；Air adjustment bypasses for even
Connect cold primary air duct and air outlet manifold.
The gas gas that cold First air is arranged in boiler reversal chamber rear portion by cold primary air duct connection air channel entrance is built-in
Heat exchanger heat exchanger, cold First air is brought up to 450 DEG C～600 DEG C from 20 DEG C by built-in heat exchanger, and hot-air is gone out by air
Mouth pipeline enters urea pyrolysis stove subsequently into pyrolysis oven, urea pyrolysis generation ammonia air Mixture is met the need of denitration engineering
Will.Because the air quantity that urea pyrolysis need is less, the thermal power very little of whole heat exchanger, any shadow is not produced to boiler performance
Ring.System economy is good, controls simple.The heat reducing urea pyrolysis needs with boiler load also accordingly reduces, and turns to
The flue-gas temperature of room is fully able to meet requirement during varying duty to cigarette temperature.Ensure not needing in all loads to arrange electrical heating again
Device can meet the needs for urea pyrolysis temperature for the full load as supplement.
Further: described built-in heat exchanger is pipe heat exchanger, in pipe, medium is air, and pipe is outer to be flue gas.
Further: described built-in heat exchanger is tp347h stainless steel material heat exchanger.
Further: Hand-operated butterfly valve, electric butterfly valve, effusion meter and air pressure are provided with described cold primary air duct and survey
Point.
Further: in described air adjustment bypass, be provided with Hand-operated butterfly valve, electric butterfly valve and electric adjustable valve.
Further: Hand-operated butterfly valve, temperature point and pressure-measuring-point are provided with described air outlet manifold.
Adjust the flow of bypass air by being arranged on the temperature point of air outlet manifold so that entering urea pyrolysis stove
Air themperature meet pyrolysis needs.The air capacity entering urea pyrolysis stove is controlled to meet pyrolytic reaction need eventually through effusion meter
Will.
The method have the advantages that cold First air passes through cold primary air duct connection air channel entrance is arranged in boiler
The gas gas built-in heat exchanger heat exchanger at reversal chamber rear portion, cold First air is brought up to 450～600 from 20 DEG C by built-in heat exchanger
DEG C, hot-air enters urea pyrolysis stove subsequently into pyrolysis oven by air outlet manifold, and urea pyrolysis generation ammonia air is mixed
Close the needs of fullness caused by stagnant QI foot denitration engineering.Because the air quantity that urea pyrolysis need is less, the thermal power very little of whole heat exchanger, to pot
Stove performance does not produce any impact.System economy is good, controls simple.The heat reducing urea pyrolysis needs with boiler load
Amount also accordingly reduces, and the flue-gas temperature of reversal chamber is fully able to meet the requirement to cigarette temperature during varying duty.Ensure in all loads
Do not need to arrange electric heater again and can meet the needs for urea pyrolysis temperature for the full load as supplement.
Brief description
Fig. 1 is the overall structure figure of the present invention；
In figure, the cold primary air duct of 1-, 2- air outlet manifold, the bypass of 3- air adjustment, 4- built-in heat exchanger, 5- pot
Stove, 6- urea pyrolysis stove.
Specific embodiment
Hereinafter in connection with accompanying drawing, the one exemplary embodiment of the present invention is described.For clarity and conciseness,
All features of actual embodiment are not described in the description.It should be understood, however, that developing any this actual enforcement
A lot of decisions specific to embodiment, to realize the objectives of developer, for example, symbol must be made during example
Close those restrictive conditions related to system and business, and these restrictive conditions may have with the difference of embodiment
Changed.Additionally, it also should be appreciated that although development is likely to be extremely complex and time-consuming, but to having benefited from the present invention
For those skilled in the art of disclosure, this development is only routine task.
Here is in addition it is also necessary to illustrate is a bit, in order to avoid having obscured the present invention because of unnecessary details, in the accompanying drawings
Illustrate only and the apparatus structure closely related according to the solution of the present invention and/or process step, and eliminate and the present invention
The little other details of relation.
A kind of smoke heat exchanging system for urea pyrolysis of present embodiment, understands, it includes cold First air referring to Fig. 1
Pipeline 1, air outlet manifold 2, air adjustment bypass 3, built-in heat exchanger 4, boiler 5 and urea pyrolysis stove 6；Described built-in
Heat exchanger 4 is arranged in boiler 5 reversal chamber rear portion, and cold primary air duct 1 is connected with the entrance point of built-in heat exchanger 4, and air goes out
One end of mouthful pipeline 2 is connected with the port of export of built-in heat exchanger 4, the other end of air outlet manifold 2 and urea pyrolysis stove 6；
Air adjustment bypass 3 is used for connecting cold primary air duct 1 and air outlet manifold 2.Described built-in heat exchanger 4 is pipe type heat transfer
Device, in pipe, medium is air, and pipe is outer to be flue gas.Described built-in heat exchanger 4 is tp347h stainless steel material heat exchanger.Described
Hand-operated butterfly valve, electric butterfly valve, effusion meter and air pressure measuring point are provided with cold primary air duct 1.Described air adjustment bypass 3
On be provided with Hand-operated butterfly valve, electric butterfly valve and electric adjustable valve.Hand-operated butterfly valve is provided with described air outlet manifold 2, temperature is surveyed
Point and pressure-measuring-point.
Built-in heat exchanger 4 is tentatively arranged in the low mistake of boiler back end ductwork or low top again, flue gas temperature under bmcr operating mode
About 700 DEG C of degree, because dilution wind is derived from 30 DEG C about of cold First air, heat exchange temperature and pressure are big, flow is little, and the present invention is by cold First air
It is heated to 450 DEG C～600 DEG C, cooling high-temperature fume very little, the impact to the overall thermal performance of boiler is negligible.
Although disclosed embodiment is as above, its content is only to facilitate understand the technical side of the present invention
Case and the embodiment that adopts, are not intended to limit the present invention.Technical staff in any the technical field of the invention, not
On the premise of departing from disclosed core technology scheme, any modification can be made on the form implemented and details and become
Change, but the protection domain that the present invention is limited, still must be defined by the scope of appending claims restriction.
Claims (6)
1. a kind of smoke heat exchanging system for urea pyrolysis it is characterised in that: include cold primary air duct (1), air outlet slit
Pipeline (2), air adjustment bypass (3), built-in heat exchanger (4), boiler (5) and urea pyrolysis stove (6)；Described built-in heat exchange
Device (4) is arranged in boiler (5) reversal chamber rear portion, and cold primary air duct (1) is connected with the entrance point of built-in heat exchanger (4), empty
One end of gas export pipeline (2) is connected with the port of export of built-in heat exchanger (4), the other end of air outlet manifold (2) and urine
Plain pyrolysis oven (6)；Air adjustment bypass (3) is used for connecting cold primary air duct (1) and air outlet manifold (2).
2. a kind of smoke heat exchanging system for urea pyrolysis according to claim 1 it is characterised in that: described built-in
Heat exchanger (4) is pipe heat exchanger, and in pipe, medium is air, and pipe is outer to be flue gas.
3. a kind of smoke heat exchanging system for urea pyrolysis according to claim 1 it is characterised in that: described built-in
Heat exchanger (4) is tp347h stainless steel material heat exchanger.
4. a kind of smoke heat exchanging system for urea pyrolysis according to claim 1 it is characterised in that: described cold once
Hand-operated butterfly valve, electric butterfly valve, effusion meter and air pressure measuring point are provided with air pipe line (1).
5. a kind of smoke heat exchanging system for urea pyrolysis according to claim 1 it is characterised in that: described air is adjusted
It is provided with Hand-operated butterfly valve, electric butterfly valve and electric adjustable valve on section bypass (3).
6. a kind of smoke heat exchanging system for urea pyrolysis according to claim 1 it is characterised in that: described air goes out
It is provided with Hand-operated butterfly valve, temperature point and pressure-measuring-point on mouth pipeline (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610781819.5A CN106370034A (en) | 2016-08-30 | 2016-08-30 | Flue gas heat exchange system for urea pyrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610781819.5A CN106370034A (en) | 2016-08-30 | 2016-08-30 | Flue gas heat exchange system for urea pyrolysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106370034A true CN106370034A (en) | 2017-02-01 |
Family
ID=57898670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610781819.5A Pending CN106370034A (en) | 2016-08-30 | 2016-08-30 | Flue gas heat exchange system for urea pyrolysis |
Country Status (1)
| Country | Link |
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| CN (1) | CN106370034A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108014642A (en) * | 2017-10-10 | 2018-05-11 | 湖南大唐节能科技有限公司 | Urea pyrolysis and wide load denitrification integrated device |
| CN109432977A (en) * | 2018-12-26 | 2019-03-08 | 国电龙源节能技术有限公司 | A kind of denitration dilution wind system |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968406A (en) * | 2014-05-13 | 2014-08-06 | 上海发电设备成套设计研究院 | Water gas smoke-smoke heat exchanging system and method capable of preventing low-temperature corrosion |
| CN104984560A (en) * | 2015-07-13 | 2015-10-21 | 南通亚泰工程技术有限公司 | Flue gas dewatering system |
| CN105423323A (en) * | 2015-12-23 | 2016-03-23 | 哈尔滨锅炉厂有限责任公司 | Surface type gas-gas heater for tail flue and heat exchange method thereof |
| CN205316369U (en) * | 2016-01-29 | 2016-06-15 | 山东山大华特环保工程有限公司 | Utilize flue gas waste heat to prevent flue gas - flue gas heat transfer system of low temperature corrosion |
-
2016
- 2016-08-30 CN CN201610781819.5A patent/CN106370034A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968406A (en) * | 2014-05-13 | 2014-08-06 | 上海发电设备成套设计研究院 | Water gas smoke-smoke heat exchanging system and method capable of preventing low-temperature corrosion |
| CN104984560A (en) * | 2015-07-13 | 2015-10-21 | 南通亚泰工程技术有限公司 | Flue gas dewatering system |
| CN105423323A (en) * | 2015-12-23 | 2016-03-23 | 哈尔滨锅炉厂有限责任公司 | Surface type gas-gas heater for tail flue and heat exchange method thereof |
| CN205316369U (en) * | 2016-01-29 | 2016-06-15 | 山东山大华特环保工程有限公司 | Utilize flue gas waste heat to prevent flue gas - flue gas heat transfer system of low temperature corrosion |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108014642A (en) * | 2017-10-10 | 2018-05-11 | 湖南大唐节能科技有限公司 | Urea pyrolysis and wide load denitrification integrated device |
| CN109432977A (en) * | 2018-12-26 | 2019-03-08 | 国电龙源节能技术有限公司 | A kind of denitration dilution wind system |
| CN109432977B (en) * | 2018-12-26 | 2023-11-03 | 国能龙源蓝天节能技术有限公司 | Denitration dilution air system |
| 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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Application publication date: 20170201 |
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