CN209295183U - Solve the air preheater composite structure of blocking etching problem - Google Patents
Solve the air preheater composite structure of blocking etching problem Download PDFInfo
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- CN209295183U CN209295183U CN201821683905.3U CN201821683905U CN209295183U CN 209295183 U CN209295183 U CN 209295183U CN 201821683905 U CN201821683905 U CN 201821683905U CN 209295183 U CN209295183 U CN 209295183U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model solves the air preheater composite structure of blocking etching problem, and air preheater has high temperature section and middle-temperature section, does not contain low-temperature zone；It is connected with heat medium water First air steam air heater between primary air fan and air preheater, heat medium water Secondary Air steam air heater is connected between secondary air fan and air preheater, heating agent shredded tobacco for water pipes cooler is connected between air preheater and deduster；Heating agent shredded tobacco for water pipes cooler has outlet pipe and water inlet pipe, and outlet pipe is divided into the water inlet of First air steam air heater water inlet pipe connection heat medium water First air steam air heater and the water inlet of Secondary Air steam air heater water inlet pipe connection heat medium water Secondary Air steam air heater；The water outlet of heat medium water First air steam air heater, which is summarized by First air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler, and the water outlet of heat medium water Secondary Air steam air heater, which is summarized by Secondary Air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler.The utility model can completely avoid rotary regenerative air preheater corrosion as caused by acid and ammonium hydrogen sulfate and stifled ash, and ensure that boiler efficiency is constant.
Description
Technical field
The utility model relates to a kind of air preheater composite structures for solving blocking etching problem.
Background technique
Fig. 1 is a kind of conventional air preheater dependency structure schematic diagram, and boiler 1 connects rotary regenerative air preheater 2, empty
Air preheater 2 is connected to deduster 3, and air preheater 2 connects primary air fan 4 and secondary air fan 5, and air preheater has high temperature
Section 21, middle-temperature section 22 and low-temperature zone 23.
Rotary regenerative air preheater is for air needed for the flue gas heat of economizer exit is passed to boiler combustion
The important heat exchange equipment of modern medium-and-large-sized coal-fired power station boiler.In order to improve boiler efficiency, according to coal quality condition, air preheater outlet
Exhaust gas temperature general control is between 120 DEG C~150 DEG C.The corrosion of air preheater low-temperature zone and stifled ash are running common problems,
Boiler efficiency is not only reduced, blower power consumption can also be caused to increase, even causes fan stall when stifled grey serious.
The main reason for corrosion of air preheater low-temperature zone and stifled ash, first is that the sulfuric acid vapor in flue gas condenses in changing for low-temperature zone
Cause on thermal element, second is that SO in the escape ammonia and flue gas in SCR denitration process3The ammonium hydrogen sulfate of generation is changed low-temperature zone
Condensation causes on thermal element.No matter liquid sulfuric acid or liquid sulfuric acid hydrogen ammonium, be deposited on heat exchange element, other than corrosivity,
The dust in flue gas can be also adhered to, air preheater is caused to block, the viscosity of ammonium hydrogen sulfate is stronger.
According to present research, between substantially 150 DEG C~200 DEG C of temperature range that ammonium hydrogen sulfate condenses, this temperature
Section is more taller than the adiabatic condensation temperature of sulfuric acid vapor.The operation of rotary regenerative air preheater is can not to avoid this temperature range
, therefore, the design of air preheater can not effectively avoid low-temperature zone from corroding and block up ash, can only take measures, and slow down corrosion hair
It is raw, mitigate chocking-up degree.Common technological means are as follows: 1) air preheater heat exchange element step-by-step arrangement, i.e. high temperature section, middle-temperature section and low
Temperature section (can also high middle-temperature section merge setting), and increase low-temperature zone heat exchange element length, keep the crystallizing field of ammonium hydrogen sulfate complete
Cold section is fallen in, hydrogen sulfate ammonium precipitation product area segmentation is avoided.In engineering, low-temperature zone height is generally 1000mm or so.2) using conjunction
The cold section of heat accumulating element template and material of reason.3) effective cleaning device etc. is arranged in air preheater.
But above-mentioned means cannot tackle the problem at its root.
Utility model content
The technical issues of the utility model is solved is providing a kind of brand new, can completely avoid rotary air
Preheater corrodes as caused by acid and ammonium hydrogen sulfate and stifled ash, and ensures that boiler efficiency is constant, in a certain range smoke evacuation temperature
Degree can fine tune.
Technological means used by the utility model is as described below.
A kind of air preheater composite structure solving blocking etching problem, boiler connects rotary regenerative air preheater, empty
Air preheater is connected to deduster, and air preheater connects primary air fan and secondary air fan, air preheater have high temperature section and
Middle-temperature section does not contain low-temperature zone；Heat medium water First air steam air heater, secondary air fan are connected between primary air fan and air preheater
It is connected with heat medium water Secondary Air steam air heater between air preheater, heating agent shredded tobacco for water pipes is connected between air preheater and deduster
Cooler；Heating agent shredded tobacco for water pipes cooler has outlet pipe and water inlet pipe, and outlet pipe is divided into First air steam air heater water inlet pipe connection heat medium water one
The water inlet of water inlet and Secondary Air steam air heater water inlet pipe the connection heat medium water Secondary Air steam air heater of secondary wind steam air heater；Heating agent
The water outlet of water First air steam air heater, which is summarized by First air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler, heating agent
The water outlet of water Secondary Air steam air heater, which is summarized by Secondary Air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler.
Outlet pipe connects auxiliary steam heating before being divided into First air steam air heater water inlet pipe and Secondary Air steam air heater water inlet pipe
Device.
Heat medium water variable frequency pump is arranged in water inlet pipe after First air steam air heater outlet pipe and Secondary Air steam air heater outlet pipe summarize
It is had the beneficial effect that caused by the utility model.
The utility model solves rotary regenerative air heater blocking, etching problem, and rotary regenerative air heater is reluctant
The stifled grey problem of burn into has been transferred to the relatively easy heating agent shredded tobacco for water pipes cooler for solving problems, is convenient to clean maintenance.
Detailed description of the invention
Fig. 1 is conventional air preheater dependency structure schematic diagram.
Fig. 2 is the dependency structure schematic diagram of the utility model.
Specific embodiment
A kind of air preheater composite structure for solving blocking etching problem of the utility model, boiler 1 are connected by pipeline
Rotary regenerative air preheater 2, air preheater 2 are connected to deduster 3 by pipeline, and air preheater 2 connects 4 He of primary air fan
Secondary air fan 5, focuses on, and air preheat utensil 2 has high temperature section 21 and middle-temperature section 22, does not contain low-temperature zone.
Heat medium water First air steam air heater 6 is connected between primary air fan 4 and air preheater 2, secondary air fan 5 and air are pre-
It is connected with heat medium water Secondary Air steam air heater 7 between hot device 2, heating agent shredded tobacco for water pipes cooler is connected between air preheater 2 and deduster 3
8。
Heating agent shredded tobacco for water pipes cooler 8 have outlet pipe 81 and water inlet pipe 82, outlet pipe 81 rear end be divided into First air steam air heater into
Water pipe 811 connects the water inlet of heat medium water First air steam air heater 6 and Secondary Air steam air heater water inlet pipe 812 connects heat medium water two
The water inlet of secondary wind steam air heater 7；The water outlet of heat medium water First air steam air heater 6 is summarized by First air steam air heater outlet pipe 821
Heating agent shredded tobacco for water pipes cooler 8 is connected to water inlet pipe 82, the water outlet of heat medium water Secondary Air steam air heater 7 passes through Secondary Air steam air heater outlet pipe
822 summarize to the connection heating agent shredded tobacco for water pipes cooler 8 of water inlet pipe 82.
Outlet pipe 81 divides to connect auxiliary before First air steam air heater water inlet pipe 811 and Secondary Air steam air heater water inlet pipe 812
Steam heater 9.
Heating agent is arranged in water inlet pipe 82 after First air steam air heater outlet pipe 821 and Secondary Air steam air heater outlet pipe 822 summarize
Water variable frequency pump 10.
In the present specification, Ty1, Ty2, Ty3 respectively indicate the high temperature section of rotary regenerative air heater, middle-temperature section and low-temperature zone
Exit gas temperature, low-temperature zone here are the low-temperature zones in conventional air preheater.When the utility model is implemented, to guarantee revolution
Formula air preheater does not occur to corrode and block up ash, and outlet exhaust gas temperature (Ty2) is it is ensured that the wall temperature of middle-temperature section heat exchange element is higher than sulphur
Sour hydrogen ammonium adiabatic condensation temperature, and there are appropriate allowance, Ty2 is calculated by concrete engineering condition and is determined.
The utility model is to ensure that boiler efficiency does not reduce, and heat medium water heat-exchange system (includes heating agent shredded tobacco for water pipes cooler, heat medium water
First air steam air heater and heat medium water Secondary Air steam air heater) capacity should be with novel rotary type air preheater middle-temperature section exit gas temperature
(Ty2) be used as its inlet temperature, using conventional rotary regenerative air heater low-temperature zone exit gas temperature (Ty3) as its outlet temperature into
Row type selecting, and there are appropriate allowance, Ty3 is calculated by concrete engineering condition and is determined.
The utility model uses heat medium water frequency conversion pump group, and the adjustment of heating agent water may be implemented in the revolving speed by adjusting pump,
And then realize the adjusting (meeting low as far as possible under security situation) of heating agent shredded tobacco for water pipes cooler exit gas temperature Ty3, and then can be complete
Ensure high efficiency boiler rate in load range, cooperation auxiliary steam heating device can ensure novel rotary type within the scope of full load
Air preheater middle-temperature section wall temperature is higher than ammonium hydrogen sulfate adiabatic condensation temperature.
The auxiliary steam heating device, main function are as follows: 1) the initial water temperature needed to establish heating agent water system；
2) for preventing heat medium water heat-exchange system frostbite during winter operation/stoppage in transit；3) (winter operation, is set coal varitation when necessary
Alternative type allowance deficiency etc.), to improve novel rotation regenerative air heater middle-temperature section wall temperature, to guarantee that ammonium hydrogen sulfate does not occur
Condensation.
Heating agent shredded tobacco for water pipes cooler operating condition is severe, can be using mature anticorrosion, anti-wear, anti-clogging technology, such as: 1)
Abrasionproof false tube is arranged in cigarette cooler entrance；2) heat exchanger tube uses H-type finned tube；3) cigarette cooler outlet section heat exchanger tube is (containing fin, branch
Fagging etc.) it uses and crosses enamel processing；4) efficient soot blower etc. is arranged in heating agent shredded tobacco for water pipes cooler.These technological means are in active service machine
There are the experience and achievement of successful operation in group.
Heat medium water steam air heater works in environment corrosion-free, without wearing, without risk is blocked, is using routine techniques production
Can, it is the mature equipment on boiler controller system.
It is that the stifled grey problem of conventional rotary regenerative air preheater low-temperature zone burn into has been transferred to phase in the utility model in essence
It solves to block, on the heating agent shredded tobacco for water pipes cooler of etching problem to easy.
In the stifled grey problem of processing burn into, rotary regenerative air heater relative difficulty, soot blowing effect is difficult to ensure.The reason is as follows that:
1) soot blower is arranged on the cold and hot end flue of air preheater, and soot blower is opposite transport with air preheater heat exchange element
Dynamic relationship causes sootblowing dielectric (superheated steam or high-pressure washing water) cannot be with most appropriate angle and whole energy effects
Onto heat exchange element, soot blowing effect is had a greatly reduced quality；2) soot blower can only be arranged on the cold and hot end flue of air preheater, be blown
The energy of grey medium is unevenly distributed in the whole height of heat exchange element, i.e., heat exchange element deashing remoter from cool and heat ends is more tired
It is difficult.Root is it was found that ammonium hydrogen sulfate coagulation region is away between preheater low-temperature zone heat transfer element bottom about 380mm~810mm.Cause
This, the structure of existing rotary regenerative air heater causes soot blowing ineffective.
Heating agent shredded tobacco for water pipes cooler is relatively easy in the stifled grey problem of processing burn into.Since heating agent shredded tobacco for water pipes cooler is directly arranged at
On flue, and it is static equipment, is taking necessary anticorrosion, in anti-wear, anti-clogging technical foundation, soot blower is cold with cigarette
Device heat exchange element is opposing stationary, and soot blower flexible arrangement, can accomplish to blow it is complete, blow through, it is ensured that ash-removal effect.
Claims (3)
1. a kind of air preheater composite structure for solving blocking etching problem, boiler connect rotary regenerative air preheater, air
Preheater is connected to deduster, and air preheater connects primary air fan and secondary air fan, which is characterized in that air preheater has
High temperature section and middle-temperature section do not contain low-temperature zone；
Heat medium water First air steam air heater is connected between primary air fan and air preheater, between secondary air fan and air preheater
It is connected with heat medium water Secondary Air steam air heater, heating agent shredded tobacco for water pipes cooler is connected between air preheater and deduster；
Heating agent shredded tobacco for water pipes cooler has outlet pipe and water inlet pipe, and it is primary that outlet pipe is divided into First air steam air heater water inlet pipe connection heat medium water
The water inlet of water inlet and Secondary Air steam air heater water inlet pipe the connection heat medium water Secondary Air steam air heater of wind steam air heater；Heat medium water
The water outlet of First air steam air heater, which is summarized by First air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler, heat medium water
The water outlet of Secondary Air steam air heater, which is summarized by Secondary Air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler.
2. the air preheater composite structure as described in claim 1 for solving blocking etching problem, which is characterized in that outlet pipe
Auxiliary steam heating device is connected before being divided into First air steam air heater water inlet pipe and Secondary Air steam air heater water inlet pipe.
3. the air preheater composite structure as claimed in claim 1 or 2 for solving blocking etching problem, which is characterized in that one
Heat medium water variable frequency pump is arranged in water inlet pipe after secondary wind steam air heater outlet pipe and Secondary Air steam air heater outlet pipe summarize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821683905.3U CN209295183U (en) | 2018-10-17 | 2018-10-17 | Solve the air preheater composite structure of blocking etching problem |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821683905.3U CN209295183U (en) | 2018-10-17 | 2018-10-17 | Solve the air preheater composite structure of blocking etching problem |
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| CN209295183U true CN209295183U (en) | 2019-08-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109163351A (en) * | 2018-10-17 | 2019-01-08 | 中国电力工程顾问集团华北电力设计院有限公司 | Solve the air preheater composite structure of blocking etching problem |
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2018
- 2018-10-17 CN CN201821683905.3U patent/CN209295183U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109163351A (en) * | 2018-10-17 | 2019-01-08 | 中国电力工程顾问集团华北电力设计院有限公司 | Solve the air preheater composite structure of blocking etching problem |
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