CN109632277A - A kind of rotary regenerative air heater heat exchange element performance test system and method - Google Patents
A kind of rotary regenerative air heater heat exchange element performance test system and method Download PDFInfo
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- CN109632277A CN109632277A CN201811545510.1A CN201811545510A CN109632277A CN 109632277 A CN109632277 A CN 109632277A CN 201811545510 A CN201811545510 A CN 201811545510A CN 109632277 A CN109632277 A CN 109632277A
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Abstract
The present invention relates to a kind of rotary regenerative air heater heat exchange element performance test system and methods, belong to new energy and field of energy-saving technology.At present, the main reason for rotary regenerative air heater blocks is the blocking of hydrogen sulfate ammonia, the blocking position of hydrogen sulfate ammonia and the Temperature Distribution of heat exchange element have much relations, but currently without the method for test rotary regenerative air heater heat exchange element temperature, thus rotary regenerative air heater transformation often falls flat, and causes huge waste.The present invention includes valve, experiment casing, control system, gas proportioning damper and air conditioning baffle etc., template that can be to be taken to transformation in advance carries out experimental study and test, test rotary regenerative air heater drag characteristic, heat transfer characteristic and hydrogen sulfate ammonia deposition characteristics, it selects optimal, most reasonable template to carry out rotary regenerative air heater transformation by test result, huge economic benefit can be obtained.
Description
Technical field
The present invention relates to a kind of rotary regenerative air heater heat exchange element performance test system and methods, belong to new energy and energy conservation
Technical field.
Background technique
Rotary regenerative air preheater can be separated into flue gas flow side, air circulation side and sealing along rotor rotation direction
It is added in addition, air side is also divided into two circulating areas of First air and Secondary Air by trisector air heater in area
Air preheater rotor is divided into 6 fan-shaped regions by the seal area among three circulating areas, flue gas by flue from top to bottom
Into the flue gas Circulation Area of rotary regenerative air heater, flue from below flows out, until the follow-up equipments such as dedusting；Air is by air duct under
Into the air circulation area of rotary regenerative air heater on and, flowed out from the air duct of top, until the boiler plants such as coal pulverizer, combustion chamber,
Flue gas circulating area and air circulation region are separated by the compartment of rotor, in addition, air circulation region is usually divided into not again
Same circulation passage leads to First air and Secondary Air respectively, thus becomes trisector air heater or even four points
Storehouse rotary regenerative air preheater.Rotor is driven by central axis, and the heat transfer element being arranged in rotor constantly enters from fume side
Air side, and it is transferred to fume side from air side, heat is absorbed from fume side, heat is released in air side, loops back and forth like this, make
The heat for obtaining fume side is indirectly transferred to air side, heats primary and secondary air, reduces exhaust gas temperature, reaches energy-efficient purpose.
Under the increasingly strict situation of environmental protection standard, in order to meet NOxQualified discharge, Thermal generation unit is real on a large scale
SCR denitration transformation of facility is applied.By the end of the first half of the year in 2015, thermoelectricity denitration installed capacity was accumulative up to 7.5 hundred million kilowatts, and denitration fills
The specific gravity that machine capacity accounts for thermoelectricity total installation of generating capacity rises to 87% by the 16.9% of the end of the year 2011.
With coming into operation for new system, gradually appear due to denitration part-structure design it is unreasonable, the escaping of ammonia rate is exceeded,
The reasons such as the new denitration operating condition of air preheater inadaptability in structure cause air preheater to be frequent blocking, corrosion now
As causing unit unplanned outage when serious.Blocking, corrosion three consequences of generation: first, cause air preheater heat transfer element
Thermal resistance increases, heat transfer deterioration, and exhaust gas temperature increases, and primary and secondary air temperature drop is low, and economy reduces；Second, cause cigarette duct resistance
It is abnormal to increase, cause pressure fan, air-introduced machine, primary air fan to run under high pressure, inefficient state for a long time, not only power consumption increases
Greatly, while making each blower work in unstable condition region, cause blower surge, unit output is limited, and cigarette air duct is caused when serious
Destroy fan blade fracture accident；Third, the major defect of rotary regenerative air preheater are that have an inevitably leakage pressure
Power is poor, and the consequence that ventilation resistance increases is exactly that air side pressure increases, and fume side negative pressure reduces, and leads to air leak rate of air preheater
Increase, unit performance driving economy reduces.
Start within 2016 to require fired power generating unit to reach ultra-clean discharge, discharged nitrous oxides index is from 100mg/m3It is down to
50mg/m3, each power plant carries out ultra-clean transformation, catalyst generally increased to three layers by two layers, increase ammonia spraying amount, amount of ammonia slip with
Increase, the increase of time is used especially with catalyst, amount of ammonia slip sharply increases, and it is obvious that air preheater blocks the period
Shorten.Especially in underrun, denitration reactor inlet flue-gas temperature is low, and the low the escaping of ammonia of reaction efficiency increases.Meanwhile
Underload exhaust gas temperature is low, and air preheater metal temperature is low, and Ash Blocking in Air Preheater is more serious.
Using and dissipating with the energy, energy saving and efficiency increasing have become energy industry development topic and every scientific and technical research
The research direction of person.It is estimated that increasing 15 degree for 600MW unit exhaust gas temperature, boiler efficiency about reduces by 1%, increases unit and supplies
Electric coal consumption 3g/kWh；Air leak rate of air preheater is every to increase 1%, and boiler efficiency decline 0.1%, unit net coal consumption rate increases 0.24g/
kWh；Air preheater flue gas collateral resistance drops to 1.3kPa by 3.8kPa, and blower total current about declines 150A.Therefore current
Under environmentally friendly new demand, energy-saving anti-blocking transformation is carried out to air preheater and is had a wide range of applications.The method master being transformed at present
If replacing heat exchange element, using the heat exchange element of a variety of different templates, test energy conservation and anti-blocking dual purpose are such as applied
Number be 201520759560.5 Chinese patent.But current rotary regenerative air heater transformation often falls flat, and causes
Huge waste.Currently, rotary regenerative air heater is the blocking of hydrogen sulfate ammonia, the blocking position of hydrogen sulfate ammonia the main reason for blocking
There are much relations with the Temperature Distribution of heat exchange element, but currently without the method for test rotary regenerative air heater heat exchange element temperature.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and a kind of rotary regenerative air heater is provided and is changed
Thermal element performance test system and method can test in advance to template progress experimental study and test to be taken is transformed
Rotary regenerative air heater drag characteristic, heat transfer characteristic and hydrogen sulfate ammonia deposition characteristics are selected optimal, most reasonable by test result
Template carries out rotary regenerative air heater transformation, can obtain huge economic benefit.
Technical solution used by the present invention solves the above problems is: a kind of rotary regenerative air heater heat exchange element performance test
System, which is characterized in that including valve, experiment casing, control system, gas proportioning damper and air conditioning baffle；The examination
Tryoff body is for installing heat exchange element, and the both ends of experiment casing are connected to flue, the flue be divided into 4 branches respectively with
Rotary regenerative air heater gas approach, rotary regenerative air heater exhaust pass, the air duct Leng Yici are connected to hot secondary air duct, the valve
It is separately mounted on rotary regenerative air heater gas approach, rotary regenerative air heater exhaust pass, the air duct Leng Yici and hot secondary air duct,
And gas proportioning damper is mounted on rotary regenerative air heater gas approach, air conditioning baffle is mounted on hot secondary air duct, institute
Valve is stated to connect with control system.
Furthermore, flow measurement equipment is mounted on the flue at the experiment casing both ends and temperature measurement is set
It is standby, and the both ends of experiment casing are equipped with differential pressure measurement equipment.
Furthermore, flue gas blower, and flue gas blower and control are installed on the rotary regenerative air heater exhaust pass
System connection, enables flue gas flow rate to reach test requirements document.
Steps are as follows for rotary regenerative air heater heat exchange element method for testing performance: need to heat exchange element to be tested be installed on examination
In tryoff body, control system controls fume side valve valve and air side valve valve alternation switch, when fume side valve is opened
When, air side valve is closed；When fume side valve close after, air side valve open, valve open and close period and by
The swing circle for testing rotary regenerative air heater is identical；Start flue gas blower, by gas proportioning damper adjust flue gas flow rate until
It is consistent with the flue gas flow rate of rotary regenerative air heater, by air conditioning baffle adjust air velocity until with rotary regenerative air heater
Air velocity is consistent；Flue gas flow is measured by flow measurement equipment, measures inlet flue gas temperature respectively by temperature measurement equipment
Degree, exit gas temperature, air temperature of entrance, the wall temperature for exporting hot blast temperature and each section of heat exchange element, pass through differential pressure measurement
The both ends differential pressure of device measuring experiment casing；Start experimental study, take out heat exchange element later, carries out hydrogen sulfate ammonia deposition
Assessment.
Above-mentioned test method can really reappear the course of work of rotary regenerative air heater heat exchange element, and experiment casing can be carried out
The performance test of various heat exchange element, and experiment casing is flange arrangement, can be used to repeatedly test.Heat exchange member is obtained by measurement
The profiling temperatures of part each position.
Above-mentioned test method can replace the heat exchange property of rotary regenerative air heater by device experiment data.Cold wind is derived from cold
Secondary Air or cold First air, it is preferred to use cold First air, it is ensured that air quantity.Test the operation of process simulation rotary regenerative air heater
Mode assesses the deposition position of hydrogen sulfate ammonia and the chocking-up degree of rotary regenerative air heater in heat exchange element；In rotary regenerative air heater
Heat exchange property, differential pressure and the thermo parameters method of rotary regenerative air heater heat exchange element are assessed before transformation in advance.
Long period test, the stifled ash of research rotary regenerative air heater and corrosion can be carried out using this method on rotary regenerative air heater
Situation further studies rotary regenerative air heater anti-clogging and method of inhibiting corrosion and scheme.
Compared with prior art, the present invention having the following advantages that and effect: the present invention uses external rotary regenerative air heater
Heat-exchanger rig, the true operating condition for reappearing rotary regenerative air heater, tests the performance data of rotary regenerative air heater heat exchange element, surveys
Resistance, heat exchange efficiency and the rotary regenerative air heater ammonium hydrogen sulfate deposition of rotary regenerative air heater are measured, and can be tested back
The profiling temperatures of rotatable air preheater heat exchange element.Various change can be tested before the transformation of rotary regenerative air heater heat exchange element
The performance of thermal element, than selecting optimal most reasonable rotary regenerative air heater heat exchange element modification scheme.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the embodiment of the present invention.
Fig. 2 is the schematic view of the front view of experiment casing in the embodiment of the present invention.
Fig. 3 is the side structure schematic view of experiment casing in the embodiment of the present invention.
Fig. 4 is the overlooking structure diagram of experiment casing in the embodiment of the present invention.
In figure: valve 1, heat exchange element 2, experiment casing 3, flow measurement equipment 4, temperature measurement equipment 5, flue gas blower 6,
Differential pressure measurement equipment 7, control system 8, flue 9, gas proportioning damper 10, air conditioning baffle 11, rotary regenerative air heater entrance
Flue 12, rotary regenerative air heater exhaust pass 13, the air duct Leng Yici 14, hot secondary air duct 15.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1 to Fig. 4, rotary regenerative air heater heat exchange element performance test system in the present embodiment, including valve 1,
Experiment casing 3, control system 8, gas proportioning damper 10 and air conditioning baffle 11；Experiment casing 3 is for installing heat exchange element
2, and the both ends of experiment casing 3 are connected to flue 9, flue 9 be divided into 4 branches respectively with rotary regenerative air heater gas approach
12, rotary regenerative air heater exhaust pass 13, the air duct Leng Yici 14 are connected to hot secondary air duct 15, and valve 1 is separately mounted to turn round
On formula air preheater gas approach 12, rotary regenerative air heater exhaust pass 13, the air duct Leng Yici 14 and hot secondary air duct 15, and flue gas
Controllable register 10 is mounted on rotary regenerative air heater gas approach 12, and air conditioning baffle 11 is mounted on hot secondary air duct 15,
Valve 1 is connect with control system 8.
Flow measurement equipment 4 and temperature measurement equipment 5, and experiment casing are mounted on the flue 9 at 3 both ends of experiment casing
3 both ends are equipped with differential pressure measurement equipment 7.
Flue gas blower 6 is installed, and flue gas blower 6 is connect with control system 8, is made on rotary regenerative air heater exhaust pass 13
Test requirements document can be reached by obtaining flue gas flow rate.
Steps are as follows for rotary regenerative air heater heat exchange element method for testing performance: need to heat exchange element 2 to be tested be installed on
In experiment casing 3, control system 8 controls fume side valve valve 1 and 1 alternation switch of air side valve valve, when flue gas side valve
When door 1 is opened, air side valve 1 is closed；After fume side valve 1 is closed, air side valve 1 is opened, and valve 1 opens and closes
Period it is identical with the swing circle of tested rotary regenerative air heater；Start flue gas blower 6, is adjusted by gas proportioning damper 10
Flue gas flow rate until consistent with the flue gas flow rate of rotary regenerative air heater, by air conditioning baffle 11 adjust air velocity until with
The air velocity of rotary regenerative air heater is consistent；Flue gas flow is measured by flow measurement equipment 4, is divided by temperature measurement equipment 5
It Ce Liang not entrance flue gas temperature, exit gas temperature, air temperature of entrance, outlet hot blast temperature and each section of heat exchange element 2
Wall temperature measures the both ends differential pressure of experiment casing 3 by differential pressure measurement equipment 7；Start experimental study, take out heat exchange element 2 later,
Carry out the assessment of hydrogen sulfate ammonia deposition.
Above-mentioned test method can really reappear the course of work of rotary regenerative air heater heat exchange element 2, and experiment casing 3 can be into
The performance test of row various heat exchange element 2, and experiment casing 3 is flange arrangement, can be used to repeatedly test.It is obtained and is changed by measurement
The profiling temperatures of 2 each position of thermal element.
Above-mentioned test method can replace the heat exchange property of rotary regenerative air heater by device experiment data.Cold wind is derived from cold
Secondary Air or cold First air, it is preferred to use cold First air, it is ensured that air quantity.Test the operation of process simulation rotary regenerative air heater
Mode assesses the deposition position of hydrogen sulfate ammonia and the chocking-up degree of rotary regenerative air heater in heat exchange element 2；In rotary regenerative air heater
Heat exchange property, differential pressure and the thermo parameters method of rotary regenerative air heater heat exchange element 2 are assessed before transformation in advance.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (8)
1. a kind of rotary regenerative air heater heat exchange element performance test system, which is characterized in that including valve (1), experiment casing
(3), control system (8), gas proportioning damper (10) and air conditioning baffle (11)；The experiment casing (3) is changed for installing
Thermal element (2), and the both ends of experiment casing (3) are connected to flue (9), the flue (9) be divided into 4 branches respectively with revolution
Formula air preheater gas approach (12), rotary regenerative air heater exhaust pass (13), the air duct Leng Yici (14) and hot secondary air duct (15)
Connection, the valve (1) be separately mounted to rotary regenerative air heater gas approach (12), rotary regenerative air heater exhaust pass (13),
On a cold air duct (14) and hot secondary air duct (15), and gas proportioning damper (10) is mounted on rotary regenerative air heater gas approach
(12) on, air conditioning baffle (11) is mounted on hot secondary air duct (15), and the valve (1) connect with control system (8).
2. rotary regenerative air heater heat exchange element performance test system according to claim 1, which is characterized in that the test
Flow measurement equipment (4) and temperature measurement equipment (5), and experiment casing (3) are mounted on the flue (9) at cabinet (3) both ends
Both ends differential pressure measurement equipment (7) are installed.
3. rotary regenerative air heater heat exchange element performance test system according to claim 1, which is characterized in that the revolution
It is equipped on formula air preheater exhaust pass (13) flue gas blower (6), and flue gas blower (6) is connect with control system (8).
4. a kind of rotary regenerative air heater heat exchange element method for testing performance, which is characterized in that using any in such as claim 1-3
Rotary regenerative air heater heat exchange element performance test system described in；Steps are as follows: heat exchange element to be tested (2) will be needed to install
In experiment casing (3), control system (8) controls fume side valve valve (1) and air side valve valve (1) alternation switch,
When fume side valve (1) is opened, air side valve (1) is closed；After fume side valve (1) is closed, air side valve (1) is beaten
It opens, the period that valve (1) opens and closes is identical with the swing circle of tested rotary regenerative air heater；Start flue gas blower (6),
Flue gas flow rate is adjusted until consistent with the flue gas flow rate of rotary regenerative air heater by gas proportioning damper (10), passes through air conditioning
Baffle (11) adjusts air velocity until consistent with the air velocity of rotary regenerative air heater；It is measured by flow measurement equipment (4)
Flue gas flow, measured respectively by temperature measurement equipment (5) entrance flue gas temperature, exit gas temperature, air temperature of entrance,
The wall temperature for exporting hot blast temperature and each section of heat exchange element (2) passes through the both ends of differential pressure measurement equipment (7) measurement experiment casing (3)
Differential pressure；Start experimental study, take out heat exchange element (2) later, carries out the assessment of hydrogen sulfate ammonia deposition.
5. rotary regenerative air heater heat exchange element method for testing performance according to claim 4, which is characterized in that the test
Cabinet (3) can be carried out the performance test of various heat exchange element (2), and experiment casing (3) is flange arrangement, can be used to repeatedly survey
Examination.
6. rotary regenerative air heater heat exchange element method for testing performance according to claim 4, which is characterized in that testing
Cheng Zhong obtains the profiling temperatures of heat exchange element (2) each position by measuring.
7. rotary regenerative air heater heat exchange element method for testing performance according to claim 4, which is characterized in that cold wind is derived from
Cold Secondary Air or cold First air.
8. rotary regenerative air heater heat exchange element method for testing performance according to claim 4, which is characterized in that test process
The method of operation of rotary regenerative air heater is simulated, the deposition position and rotary regenerative air heater of hydrogen sulfate ammonia in assessment heat exchange element (2)
Chocking-up degree；Assess heat exchange property, the difference of rotary regenerative air heater heat exchange element (2) in advance before rotary regenerative air heater transformation
Pressure and thermo parameters method.
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| CN110160785A (en) * | 2019-05-17 | 2019-08-23 | 华中科技大学 | A kind of experimental rig for testing true environment submerged lubrication bearing performance |
| CN110425566A (en) * | 2019-07-12 | 2019-11-08 | 华电电力科学研究院有限公司 | A kind of air preheater monitoring early-warning system and its working method |
| CN111044275A (en) * | 2019-12-03 | 2020-04-21 | 华电电力科学研究院有限公司 | Method for monitoring blockage degree of air preheater |
| CN111964928A (en) * | 2020-06-24 | 2020-11-20 | 华电电力科学研究院有限公司 | Unilateral exhaust smoke temperature rise test method for treating blockage of air preheater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111044275A (en) * | 2019-12-03 | 2020-04-21 | 华电电力科学研究院有限公司 | Method for monitoring blockage degree of air preheater |
| CN111964928A (en) * | 2020-06-24 | 2020-11-20 | 华电电力科学研究院有限公司 | Unilateral exhaust smoke temperature rise test method for treating blockage of air preheater |
| CN111964928B (en) * | 2020-06-24 | 2022-02-18 | 华电电力科学研究院有限公司 | Unilateral exhaust smoke temperature rise test method for treating blockage of air preheater |
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