CN107166417A - A kind of new MGGH systems minimum wall temperature control method and system - Google Patents
A kind of new MGGH systems minimum wall temperature control method and system Download PDFInfo
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- CN107166417A CN107166417A CN201710556726.7A CN201710556726A CN107166417A CN 107166417 A CN107166417 A CN 107166417A CN 201710556726 A CN201710556726 A CN 201710556726A CN 107166417 A CN107166417 A CN 107166417A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of new MGGH systems minimum wall temperature control method and system, methods described by contrasting the difference of MGGH system circulations pump intake (or outlet) water temperature and setting valve automatically, when water temperature is less than (or higher than) setting valve, automatically instruction cycles pump variable frequency is sent, increase (or reduction) MGGH system circulation waters, so as to improve (or reduction) circulating water temperature indirectly, ensure that more than safe temperature, MGGH systems reliability of operation under each operating mode has been significantly greatly increased in the minimum operating wall temperature control of whole MGGH systems heating surface.
Description
Technical field
It is specially one kind the present invention relates to flue gas cooling before station boiler desulfurization-flue gas after desulfurization heating system art field
New MGGH systems minimum wall temperature control method and system.
Background technology
According to calculation of thermodynamics formula Q=K*F* Δ T, wherein, Q is heat output, and K is the coefficient of heat transfer, and Δ T is heat transfer temperature
Pressure, that is, the heat conducted is directly related with heat transfer coefficient, heat exchange area and heat transfer temperature and pressure, and heat transfer coefficient is relevant with velocity of medium,
Heat exchange area is relevant with design arrangement, and heat transfer temperature and pressure are relevant with the out temperature of cold fluid and hot fluid.
MGGH systems (also known as WGGH systems, i.e., the gas-gas heat-exchange system by thermal medium of recirculated water) are by thermal medium
Water is absorbed heat in gas cooler, and the former flue-gas temperature before desulfurization is down to and requires temperature (former flue gas adjusts temperature), is cooled
The flue gas of cooling delivers to cold precipitator or desulfuration absorbing tower, while heated thermal medium water passes through circulation in gas cooler
It is pumped to flue gas heater.In flue gas heater, heat medium water heat release is heated to the neat stress after desulfurization the temperature of environmental requirement
(temperature is adjusted in discharge) is spent to smoke stack emission.Consider the cost of whole equipment, generally, gas cooler is designed as ND steel
Or carbon steel, because the flue gas before desulfurization and after desulfurization has certain corrosivity, in order to ensure the safe operation of equipment, MGGH systems
It is required that heating surface minimum wall temperature must not be less than setting valve, and heating surface minimum wall temperature directly with circulating water temperature positive correlation, i.e. MGGH
It is required that the minimum circulating water temperature of gas cooler and flue gas heater must not be less than certain setting valve (conventional is 70 DEG C or so).
Because current power station large-sized boiler is regulating units, boiler load significantly changes as needed, into MGGH systems
Former flue gas and neat stress parameter significantly change therewith, whole MGGH can not possibly for a long time under design conditions run.
During MGGH system designs, consider that whole gas cooler and flue gas heater are advised by boiler controller system EIAJ load
Mould, it is relatively difficult to achieve according to unit load cut-out heating surface generally in unit varying duty, therefore whole MGGH
Heating surface is run under each load constant.Under each load, whole MGGH smoke increases with the increase of load, heating surface
Exchange capability of heat increases also with the increase of smoke, but change indirect 1：1 linear correlation, in underload, MGGH design
Heating surface is had more than needed relatively.
Under present circumstances, to adapt to the variable load operation of unit, MGGH control is by being adjusted into gas cooler
Water controls the outlet cigarette temperature of gas cooler in setting valve, at low load, due to low, the flue gas come the former flue-gas temperature that flows
Cooler liberated heat is not enough to the neat stress after desulfurization being heated to exhaust temperature, and inadequate heat is aided in by heat medium water
Steam heater is supplemented, and is finally reached fume emission requirement discharge.
In conventional control, in order to ensure that the normal of flue gas heat-exchange unit uses gas cooler to be to enter flue gas by regulation
The entrance water mode of cooler controls the outlet cigarette temperature of gas cooler, and flue gas vapors are controlled by auxiliary steam heater
Calculate under running on the lower load in heater outlet neat stress temperature, actual school, it is ensured that the former flue-gas temperature in the outlet of gas cooler and cigarette
The neat stress exhaust temperature of hot-air heater outlet.Heat exchanger heating surface is had more than needed under underload, gas cooler outlet circulating water temperature
Higher than design temperature, water is less than design water temperature, and the outlet circulating water temperature of flue gas heater is less than design temperature because of excessive exothermic,
Bring two consequences：
1st, due to gas cooler outlet circulating water temperature be higher than design temperature, result in the need for auxiliary steam heater because
Come that the total amount of heat that flowing water temperature uprises and need is constant, the design temperature and pressure of auxiliary steam heater reduce, and auxiliary steam heater is set
Count area increase.
2nd, after circulation, flue gas heater exit water temperature is less than design tuning value, while gas cooler inlet water temperature
Less than design tuning value, gas cooler and flue gas heater low-temperature corrosion risk are brought, whole MGGH normal operation is influenceed
Service life.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of new MGGH systems minimum wall temperature control method and system,
Ensure the normal operation of safety of whole MGGH systems, whole MGGH is not corroded by flue gas low-temperature, significantly enhances whole MGGH
System reliability.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of new MGGH systems minimum wall temperature control method, including MGGH systems gas cooler outlet fibre selection,
MGGH flue gas heaters export fibre selection and the control of MGGH system circulations water temperature, specific as follows：
MGGH systems gas cooler exports fibre selection
Step 101：The former flue-gas temperature in gas cooler outlet is gathered, this collecting temperature is called the first collecting temperature, by the
One collecting temperature is compared with the first low setting valve, the first high setting valve；
Step 102：According to the comparison result of step 101, when the first collecting temperature is more than the first low setting valve and less than the
During one high setting valve, system maintains normal operating condition；When the first collecting temperature is less than the first low setting valve, progressively beat automatically
Open hot coal water circulation bypass valve and turn down main road regulating valve automatically；When the first collecting temperature is more than the first high setting valve,
It is automatic progressively to turn down hot coal water circulation bypass valve and automatic progressively opening main road regulating valve；
Step 103：Circulation step 101 and step 102, keep the first collecting temperature high whole in the first low setting valve and first
Between definite value；
MGGH flue gas heaters export fibre selection
Step 201：Gather flue gas heater and export net cigarette temperature, this collecting temperature is called the second collecting temperature, and second is adopted
Collection temperature is compared with the second low setting valve, the second high setting valve；
Step 202：According to the comparison result of step 201, when the second collecting temperature is more than the second low setting valve and less than the
During two high setting valves, system maintains normal operating condition；When the second collecting temperature is less than the second low setting valve, progressively beat automatically
Open auxiliary steam heater line control valve opening；When adopting the second collecting temperature more than the second high setting valve, progressively close automatically
Small auxiliary steam heater line control valve opening；
Step 203：Circulation step 201 and step 202, keep the second collecting temperature high whole in the second low setting valve and second
Between definite value；
MGGH system circulations water temperature is controlled
Step 301：Water circulating pump entrance hot coal coolant-temperature gage is gathered, this temperature is called the 3rd collecting temperature, by the 3rd collection
Temperature is compared with the 3rd low setting valve, the 3rd high setting valve；
Step 302：According to the comparison result of step 301, when the 3rd collecting temperature is more than the 3rd low setting valve and less than the
During three high setting valves, system maintains normal operating condition；When the 3rd collecting temperature is less than three low setting valves, flue gas heater
Bypass valve opening is increased and water circulating pump frequency conversion increase is exerted oneself；When the 3rd collecting temperature is more than three high setting valves, recirculated water
Pump frequency conversion is reduced and exerted oneself；
Step 303：Circulation step 301 and step 302, keep the 3rd collecting temperature high whole in the 3rd low setting valve and the 3rd
Between definite value.
According to such scheme, in a step 102, if hot coal water circulation bypass valve and main road regulating valve can not work
When, system is alarmed.
According to such scheme, in step 202., if auxiliary steam heater line regulating valve can not work, system is entered
Row alarm.
According to such scheme, in step 302, if flue gas heater bypass valve can not work, system is alarmed；If
When water circulating pump can not work, system is alarmed.
A kind of new MGGH systems minimum wall temperature control system, including the MGGH system circulations being arranged on circulation water passage
Water temperature control system, the structure of the circulating water temperature control system is：Along recirculated water flow direction, circulating pump, electric gate valve,
Temperature measurement device, flow measuring probe are sequentially connected；The circulating pump is driven by variable-frequency motor, and the variable-frequency motor passes through control
Line is connected to signal and compares feedback unit, and signal compares feedback unit and is connected to temperature measurement device.
Further, it is provided with check-valves between the circulating pump and electric gate valve.
Further, the circulating pump water inlet end is provided with the first gate valve.
Further, it is provided with screen pack between the circulating pump and the first gate valve.
Compared with prior art, the beneficial effects of the invention are as follows：The fully automated control of whole MGGH systems can be made, beaten simultaneously
The broken MGGH controls state of mind mode that quantity of circulating water should be reduced at low load, can accurately ensure gas cooler under each load
Export the gentle flue gas heater of cigarette and export cigarette temperature in setting range, it is ensured that the whole minimum circulating water temperature of MGGH systems is not less than
The setting valve of security settings, so as to ensure the normal operation of safety of whole MGGH systems, whole MGGH is not corroded by flue gas low-temperature,
Significantly enhance whole MGGH system reliabilities.
Brief description of the drawings
Fig. 1 is the MGGH system schematics after present invention improvement.
Fig. 2 is that MGGH systems gas cooler of the present invention exports fibre selection process schematic.
Fig. 3 is that MGGH systems flue gas heater of the present invention exports fibre selection process schematic.
Fig. 4 is MGGH system circulations water temperature control process schematic diagram of the present invention.
Fig. 5 is the structural representation of the circulating water temperature control system of the present invention.
In figure：1- flow measuring probes；2- temperature measurement devices；3- circulating pumps；4- screen packs；The gate valves of 5- first；The locks of 6- second
Valve；7- circulating water temperature control systems；8- variable-frequency motors；9- control lines；10- signals compare feedback unit；11- electric gate valves；
12- check-valves.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Main idea is that：Cigarette temperature comparison setting valve is exported by gathering gas cooler, with gas cooler
Main road and bypass valve linkage, when gas cooler outlet cigarette temperature is less than design temperature, increase bypass valve opening subtracts simultaneously
Small main road valve opening, so that the quantity of circulating water into gas cooler is reduced, by the heat transfer temperature and pressure side for reducing gas cooler
Formula reduces gas cooler exchange capability of heat；When gas cooler, which exports former flue-gas temperature, is higher than design temperature, bypass is reduced
Control valve opening increases main road control valve opening simultaneously, and increase enters gas cooler quantity of circulating water, until bypass valve is complete
Contract fully main road valve is opened completely.
Water temperature setting valve is contrasted by gathering circulating-pump outlet (or entrance) circulating water temperature, is joined with water circulating pump variable frequency adjustment
Dynamic, when circulating water temperature is less than setting valve, water circulating pump frequency conversion increase frequency increases whole MGGH quantity of circulating water；Otherwise work as and follow
When ring water temperature is higher than setting valve, water circulating pump frequency conversion reduces frequency, reduces whole MGGH quantity of circulating water, subtracts on the premise of safety
Few water circulating pump power energy-saving.
Under underload, during the shortage of heat that gas cooler absorbs, supplemented by auxiliary steam heater heat cycles water.
Specifically, as shown in Fig. 2 when MGGH is in design conditions, gas cooler bypass is closed mode, and main road is complete
Open, gas cooler liberated heat is enough to be heated to the neat stress of flue gas heater to require that temperature is discharged, and works as unit load
During decline, the inlet flue gas temperature and entrance smoke of gas cooler decline therewith, and the heat exchange area of gas cooler is had more than needed relatively, is
Reduce the exchange capability of heat of gas cooler, by increasing bypass valve opening and reducing main road valve opening, go out gas cooler
Mouth circulating water temperature rises, so as to reduce the heat transfer temperature and pressure of whole gas cooler, reduces the heat-transfer capability of gas cooler.It is on the contrary
It is as the same.
As shown in figure 3, when flue gas heater outlet cigarette temperature is less than setting valve, i.e., being inhaled in recirculated water in gas cooler
The shortage of heat of receipts by neat stress in flue gas heater to be heated to setting valve, then by being adjusted in auxiliary steam heater
Auxiliary steam heat cycles water mode additional heat, when flue gas heater outlet cigarette temperature is higher than setting valve, regulation turns down auxiliary
Steam heater inlet steam regulating valve, reduces auxiliary steam amount (until completely closing), cigarette temperature is low when flue gas heater outlet
When setting valve, increase auxiliary steam heater inlet steam control valve aperture, increase auxiliary steam amount.
As shown in figure 4, (or entrance) circulating water temperature contrast water temperature setting valve is exported by gathering water circulating pump, with recirculated water
Pump frequency conversion regulation linkage, when circulating water temperature is less than setting valve, water circulating pump frequency conversion increase frequency increases whole MGGH recirculated waters
Amount, on the contrary when circulating water temperature is higher than setting valve, water circulating pump frequency conversion reduces frequency, reduces whole MGGH quantity of circulating water, in peace
Water circulating pump power energy-saving is reduced on the premise of complete.But the quantity of circulating water increased or decreased is not into gas cooler,
The quantity of circulating water of gas cooler is by Fig. 2 logic controls, and Fig. 4 is under gas cooler outlet fibre selection logic premise, to lead to
Bypass is crossed, unnecessary quantity of circulating water is bypassed to gas cooler outlet and mixed with the water that gas cooler comes out, due to bypass
Water not by heating, then by auxiliary steam heater, auxiliary steam heater is by Fig. 3 logic controls, because two path water is mixed
Water temperature is reduced after conjunction, and the heat transfer temperature difference of auxiliary steam heater is increased, and the design of auxiliary steam heater is more flexible.Meanwhile, mix
After conjunction quantity of circulating water increase, into flue gas heater water temperature reduction, it is necessary to release total amount of heat it is constant, flue gas heater
The temperature and pressure that conduct heat are reduced, after corresponding heat is released, and the circulating water temperature of flue gas heater outlet is improved.
As shown in figure 5, a kind of new MGGH systems minimum wall temperature control system in the present invention, including it is arranged on recirculated water and leads to
MGGH system circulation water temperature control systems on road, the structure of the circulating water temperature control system is：Along recirculated water flowing side
To circulating pump 3, electric gate valve 11, temperature measurement device 2, flow measuring probe 1 are sequentially connected；The circulating pump 3 passes through variable-frequency motor
8 drive, and the variable-frequency motor 8 is connected to signal by control line 9 and compares feedback unit 10, and signal compares feedback unit 10 and connected
To temperature measurement device 2.
As an improvement, being provided with check-valves 12 between the circulating pump 3 and electric gate valve 11.It is another to improve, in institute
State the water inlet end of circulating pump 3 and be provided with the first gate valve 5.
Claims (8)
1. a kind of new MGGH systems minimum wall temperature control method, it is characterised in that
Followed including MGGH systems gas cooler outlet fibre selection, MGGH flue gas heaters outlet fibre selection and MGGH systems
Ring water temperature is controlled, specific as follows：
MGGH systems gas cooler exports fibre selection
Step 101：The former flue-gas temperature in gas cooler outlet is gathered, this collecting temperature is called the first collecting temperature, and first is adopted
Collection temperature is compared with the first low setting valve, the first high setting valve；
Step 102：According to the comparison result of step 101, when the first collecting temperature is more than the first low setting valve and high less than first
During setting valve, system maintains normal operating condition；When the first collecting temperature is less than the first low setting valve, heat is progressively opened automatically
Coal water circulation bypass valve and turn down main road regulating valve automatically；When the first collecting temperature is more than the first high setting valve, automatically
Progressively turn down hot coal water circulation bypass valve and automatic progressively opening main road regulating valve；
Step 103：Circulation step 101 and step 102, keep the first collecting temperature in the first low setting valve and the first high setting valve
Between；
MGGH flue gas heaters export fibre selection
Step 201：Gather flue gas heater and export net cigarette temperature, this collecting temperature is called the second collecting temperature, by the second collection temperature
Degree is compared with the second low setting valve, the second high setting valve；
Step 202：According to the comparison result of step 201, when the second collecting temperature is more than the second low setting valve and high less than second
During setting valve, system maintains normal operating condition；When the second collecting temperature is less than the second low setting valve, progressively open automatically auxiliary
Help steam heater pipeline control valve opening；When adopting the second collecting temperature more than the second high setting valve, progressively turn down automatically auxiliary
Help steam heater pipeline control valve opening；
Step 203：Circulation step 201 and step 202, keep the second collecting temperature in the second low setting valve and the second high setting valve
Between；
MGGH system circulations water temperature is controlled
Step 301：Water circulating pump entrance hot coal coolant-temperature gage is gathered, this temperature is called the 3rd collecting temperature, by the 3rd collecting temperature
It is compared with the 3rd low setting valve, the 3rd high setting valve；
Step 302：According to the comparison result of step 301, when the 3rd collecting temperature is more than the 3rd low setting valve and high less than the 3rd
During setting valve, system maintains normal operating condition；When the 3rd collecting temperature is less than three low setting valves, flue gas heater bypass
Valve opening is increased and water circulating pump frequency conversion increase is exerted oneself；When the 3rd collecting temperature is more than three high setting valves, water circulating pump becomes
Frequency is reduced and exerted oneself；
Step 303：Circulation step 301 and step 302, keep the 3rd collecting temperature in the 3rd low setting valve and the 3rd high setting valve
Between.
2. a kind of new MGGH systems minimum wall temperature control method as claimed in claim 1, it is characterised in that in step 102
In, if hot coal water circulation bypass valve and main road regulating valve can not work, system is alarmed.
3. a kind of new MGGH systems minimum wall temperature control method as claimed in claim 1, it is characterised in that in step 202
In, if auxiliary steam heater line regulating valve can not work, system is alarmed.
4. a kind of new MGGH systems minimum wall temperature control method as claimed in claim 1, it is characterised in that in step 302
In, if flue gas heater bypass valve can not work, system is alarmed；If water circulating pump can not work, system is reported
It is alert.
5. a kind of new MGGH systems minimum wall temperature control system, it is characterised in that
Including the MGGH system circulation water temperature control systems being arranged on circulation water passage, the knot of the circulating water temperature control system
Structure is：Along recirculated water flow direction, circulating pump (3), electric gate valve (11), temperature measurement device (2), flow measuring probe (1) according to
It is secondary to be connected；The circulating pump (3) is driven by variable-frequency motor (8), and the variable-frequency motor (8) is connected to letter by control line (9)
Number compare feedback unit (10), signal compares feedback unit (10) and is connected to temperature measurement device (2).
6. a kind of new MGGH systems minimum wall temperature control system as claimed in claim 5, it is characterised in that in the circulation
Check-valves (12) is provided between pump (3) and electric gate valve (11).
7. a kind of new MGGH systems minimum wall temperature control system as claimed in claim 5, it is characterised in that in the circulation
Pump (3) water inlet end is provided with the first gate valve (5).
8. a kind of new MGGH systems minimum wall temperature control system as claimed in claim 7, it is characterised in that in the circulation
Screen pack (4) is provided between pump (3) and the first gate valve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710556726.7A CN107166417B (en) | 2017-07-10 | 2017-07-10 | Minimum wall temperature control method and system for MGGH system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710556726.7A CN107166417B (en) | 2017-07-10 | 2017-07-10 | Minimum wall temperature control method and system for MGGH system |
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| CN107166417A true CN107166417A (en) | 2017-09-15 |
| CN107166417B CN107166417B (en) | 2023-04-14 |
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| CN106765265A (en) * | 2017-01-05 | 2017-05-31 | 东方电气集团东方锅炉股份有限公司 | A kind of low low temperature heat system of ultra-clean discharging fire coal unit open type |
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| JP2004044859A (en) * | 2002-07-10 | 2004-02-12 | Babcock Hitachi Kk | Gas-gas heat exchanger |
| KR20120112902A (en) * | 2011-04-04 | 2012-10-12 | 한국에너지기술연구원 | Boiler flue gas heat recovery system using heat pump |
| CN104964265A (en) * | 2015-06-15 | 2015-10-07 | 杭州华电能源工程有限公司 | Energy-saving emission reduction system and energy-saving emission reduction method of horizontal type phase change heat exchanger and front-arrangement type water medium type GGH combined |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107166417B (en) | 2023-04-14 |
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