CN203656953U - Desulfurization GGH (gas gas heater) RB (runback) system - Google Patents
Desulfurization GGH (gas gas heater) RB (runback) system Download PDFInfo
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Abstract
The utility model discloses a desulfurization GGH (gas gas heater) RB (runback) system. The system comprises a PLC (programmable logic controller), an FSSS (furnace safety supervision system), a desulfurization DCS (distributed control system) and a unit coordination system, wherein the PLC is connected with the FSSS, the desulfurization DCS and the unit coordination system; the PLC sets a triggering condition for desulfurization GGH RB, when the triggering condition for the desulfurization GGH RB is satisfied, the unit coordination system is controlled to switch from a boiler following turbine state to a turbine following state, and a desulfurization accident spraying system in the desulfurization DCS is controlled to be started; the PLC sets a target load and a load decreasing rate of the desulfurization GGH RB, when the triggering condition for the desulfurization GGH RB is satisfied, the target load and the load decreasing rate of the desulfurization GGH RB are set into a load loop of the unit coordination system, the FSSS is controlled to trip coal mills according to the number of the operating coal mills, and a fuel value corresponding to the target load of the desulfurization GGH RB is used as a fuel instruction to be sent to a boiler master control.
Description
Technical field
The utility model relates to power technology field, relates in particular to the flue gas desulfurization technique field in power technology, is the system of a kind of desulfurization fume heat exchanger RB concretely.
Background technology
Along with reducing discharging, Chinese Ministry of Environmental Protection " 12 " requires to implement refinement, continue to advance total amount of pollutant emission reduction work, for reducing the discharge of pollutant, improve coal fired power generation unit synthesis desulfurating denitration efficiency, require Desulphurization for Coal-fired Power Plant system flue duct bypass to implement thorough shutoff, therefore desulfurization duct bypass shutoff work is imperative for each genco.Simultaneously this year Chinese Ministry of Environmental Protection and each Bureau of Environmental Protection of Shanxi Province each file in deadline of having emphasized Desulphurization for Coal-fired Power Plant bypass shutoff repeatedly, coal-burning power plant reduces discharging unit as emphasis and faces direct pressure.
Flue gas heat-exchange unit (Gas Gas Heater, hereinafter to be referred as GGH) be one of very important equipment in power plant desulphurization system equipment, it utilizes former flue gas that the clean flue gas after desulfurization is heated, exhaust gas temperature is reached on dew point, can reduce and enter the former flue-gas temperature in absorption tower, reduce absorption tower water consumption; Can also improve clean flue-gas temperature, slow down the corrosion of absorption tower downstream installation, favourable smoke stack emission mouth plume rise, flue gas diffusion and reduce white cigarette phenomenon.Because former flue gas is reduced to 80 ℃ below acid dew point by 130 ℃ of left and right in GGH, therefore can produce the concentrated acid liquid of a large amount of thickness in the hot side of GGH.These acid solutions not only heat exchange element to GGH and housing have very strong corrosiveness, and can adhere to the flying dust in a large amount of flue gases.In addition, after evaporating on the surface of heat exchange element through the small slurries drop of demister, also can form the foulant of solid.Above-mentioned these solids can stop up the passage of heat exchange element, the fouling of GGH, Corrosion blockage have become FGD(Flue Gas Desulfurization, flue gas desulfurization technique) one of the significant trouble of system, have a strong impact on the safe operation of FGD system and main frame.
Take the each power plant desulphurization system fault analysis of certain genco as example, statistics show: within nearly 5 years, open totally 190 times because desulphurization system fault causes by-pass damper; Wherein booster fan fault 69 times, accounts for 36.3%; GGH fault causes by-pass damper unlatching totally 75 times, accounts for 39.5%; Find by the analysis of statistical results to power plant in certain system, the ratio that causes desulphurization system to stop transport due to desulphurization system GGH fault is relatively high, reaches 39.5%.And existing control program can cause unit MFT in the time of GGH fault, thereby the unplanned stoppage in transit number of times of unit is increased greatly.And the unplanned stoppage in transit of unit is to be an important indicator in the management of power plant safety reliability index for power plant, unplanned stoppage in transit is safety problem, also be economic problems, electric quantity loss that unplanned stoppage in transit brings, equipment rehabilitation expense, fuel consume, service life of equipment loss etc. all can cause loss economically to Generation Side, for the safe operation management of five large electricity power groups, the unplanned stoppage in transit of Power Plant all must be examined to responsibility employee from level of factory leader.With regard to grid side; electrical network has entered the large unit epoch of large electrical network; large unit operation reliability height directly has influence on the safe and stable operation of electrical network; the operational reliability level that improves large unit is the electrical network net both sides' of factory common objective; the unexpected shutdown of especially newly-built 600MW or 1000MW unit; can cause the frequency fluctuation of unit place electrical network, affect the safety and stability of electrical network.
RB(Runback, fast cutback function, hereinafter to be referred as RB) test function is as the whole-process automatic automatic control system that does not allow manual intervention, it is the Important Auxiliary equipment equipment of bearing generating set as sent, fast reducing unit load when arbitrary fault trip in air-introduced machine, primary air fan, coal pulverizer or feed pump, and unit load and the peak load that still can bear at the subsidiary engine equipment of operation is adapted and realize the control of RB process.The setting of RB project is according to the difference of the difference of the difference of machine set type, trip device and operating condition and fixed, generally contains following items with regard to the typical case of thermal power plant unit: feed pump RB, stove water pump RB, coal pulverizer RB, primary air fan RB, send air-introduced machine RB.
Due in desulfurization bypass not before shutoff; in desulphurization system, the stoppage in transit of visual plant can realize by opening desulfurization bypass the off-the-line of desulphurization system and host computer system; it is the shutdown that the stoppage in transit of visual plant in desulphurization system can not have influence on main frame; therefore unit RB function mainly concentrates in the Important Auxiliary equipment of main frame; but after desulfurization bypass shutoff; in desulphurization system, the stoppage in transit of visual plant also can trigger the stoppage in transit of main frame; therefore RB function also should progressively be extended to desulphurization system, and the main frame after desulfurization bypass shutoff and desulfurization island are considered and design as integrated entirety.
According to " 12 " planning of country, national environmental protection portion file requires just to issue to cancelling desulfurization duct bypass, and therefore experimental stage is all being groped by company of each electricity power group, the domestic system reform experience not also being shaped.Under this background, the common way of each genco is in the time that GGH stops operating due to a variety of causes, directly to trigger boiler MFT action, and directly blowing out is shut down, and off-the-line desulphurization system.Cancel after desulfurization bypass, the flue gas of boiler must pass through from desulphurization absorption tower system.Therefore any factor that can cause that desulphurization system is out of service, all can cause boiler unit tripping.These factors comprise: GGH stops transport, deduster is out of service, booster fan trips, slurry circulating pump full cut-off.
Can find out from above-mentioned scheme, domestic existing technical scheme essence is when GGH is because a variety of causes is shut down and when absorption tower outlet cigarette temperature is high, and single for guaranteeing main frame and burner hearth safety, directly by boiler MFT, unit main fuel trip, makes compressor emergency shutdown.And the main frame after desulfurization bypass shutoff and desulfurization island are not considered and design as integrated entirety, thereby greatly increase the non-number of times stopping of unit, increase the risk of power plant and electric power netting safe running.
Utility model content
The utility model embodiment provides the system of a kind of desulfurization fume heat exchanger RB, to avoid the unplanned stoppage in transit of unit, guarantees the operation of unit.
In order to achieve the above object, the utility model embodiment discloses the system of a kind of desulfurization fume heat exchanger RB, comprises PLC controller, Boiler Furnace Safeguard Supervisory System, desulfurization DCS system and unit cooperative system;
Wherein, described PLC controller is connected with described Boiler Furnace Safeguard Supervisory System, desulfurization DCS system and unit cooperative system;
Described PLC controller is set the trigger condition of described desulfurization fume heat exchanger RB, in the time meeting the trigger condition of described desulfurization fume heat exchanger RB, control described unit cooperative system and be switched to machine following state by stove with machine state, and control the desulfurization accident spray system of opening in described desulfurization DCS system;
Described PLC controller is set desulfurization fume heat exchanger RB target load and load reduction of speed rate, in the time meeting the trigger condition of described desulfurization fume heat exchanger RB, described desulfurization fume heat exchanger RB target load and load reduction of speed rate are placed to the load loop of described unit cooperative system, and control described Boiler Furnace Safeguard Supervisory System according to the number of units of the coal pulverizer of operation, the coal pulverizer that trips, delivers to boiler master using fuel value corresponding to described desulfurization fume heat exchanger RB target load as fuel command.
Further, in one embodiment, the trigger condition of the desulfurization fume heat exchanger RB that described PLC controller is set comprises: the actual load of described desulfurization fume heat exchanger is not less than described desulfurization fume heat exchanger RB target load; Described desulfurization fume heat exchanger stops; And described unit cooperative system has dropped into stove with machine state.
Further, in one embodiment, described in the control of described PCL controller, Boiler Furnace Safeguard Supervisory System is according to the number of units of the coal pulverizer of operation, the jumping mill principle of coal pulverizer of tripping is: jump operation coal pulverizer the superiors mill without time delay, from top to bottom sequentially tripping with the reality of interval 5S, other coal pulverizers are also final retains three coal pulverizers operations of the bottom, and jumping is ground to instruction and deliver to Boiler Furnace Safeguard Supervisory System.
Further, in one embodiment, described PLC controller is also for after triggering as desulfurization fume heat exchanger RB, if unit actual load and described desulfurization fume heat exchanger RB target load difference meet while being less than preset difference, trigger desulfurization fume heat exchanger RB involution, to drop into desulfurization fume heat exchanger work for subsequent use.
Further, in one embodiment, on described PLC controller, also comprise involution button, for involution manually, to trigger the artificial involution of desulfurization fume heat exchanger RB, to drop into desulfurization fume heat exchanger work for subsequent use.
Further, in one embodiment, described PLC controller is autonomous control system, can pass through general processor, or digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic realization, and adopt hardwire to connect.
The system of the desulfurization fume heat exchanger RB of the utility model embodiment has following beneficial effect: by designing this new desulfurization fume heat exchanger RB function, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, in the time that stopping, desulfurization fume heat exchanger fault avoids the negative effect bringing to coal fired power generation unit operation after the dismounting of desulfurization by-pass damper and flue shutoff, realizing desulfurizer synchronizes with boiler main frame, for a long time, stable operation, greatly reduce the generation that stops the unplanned stoppage in transit of unit that fault causes due to desulfurization fume heat exchanger, for guaranteeing unit safety operation, reduce the unplanned stoppage in transit number of times of unit and there is decisive meaning, unit safety to Power Plant Side and the power supply safety of grid side all play important effect.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the system of the desulfurization fume heat exchanger RB of the utility model embodiment;
Fig. 2 utilizes the system of the desulfurization fume heat exchanger RB of the utility model embodiment to carry out the method flow diagram of flue gas heat-exchange unit RB;
Fig. 3 is the logical schematic of the utility model one application example desulfurization fume heat exchanger RB;
Fig. 4 is tripping operation coal pulverizer step and the time logical schematic of the utility model one application example desulfurization fume heat exchanger RB;
Fig. 5 is the smoke temperature change conditional curve figure of the utility model one application example.
The specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
At present, the design of the typical RB function of thermal power generation unit mainly comprises: the triggering of RB signal, the switching of unit control mode, jumping time consuming and step, RB target load and load shedding speed, RB involution major part.The design of desulfurization fume heat exchanger RB function equally also comprises the content of above-mentioned six functions.After by-pass damper is cancelled, owing to there is no bypass, the importance of desulphurization system rises, the same with main process equipment, if after desulphurization system visual plant goes wrong, very large to main frame influence on system operation, and result be exactly unit must improper stoppage in transit, therefore design new desulfurization fume heat exchanger RB.And design desulfurization fume heat exchanger RB key is need to design Site for Unit test to judge in the time that the equipment of desulphurization system goes wrong, after desulfurization fume heat exchanger GGH stops transport, whether the variation of the temperature of desulphurization system can allow operations staff have enough time reflection, whether can reduce by reducing sub-load the pressure of desulphurization system, and then spray to control temperature in conjunction with two-stage accident, drop into a set of new desulfurization fume heat exchanger drive unit for subsequent use simultaneously.If said process is controlled, when desulfurization fume heat exchanger is stopped transport, without triggering main frame MFT action, can trigger newly-designed desulfurization fume heat exchanger RB drops to unit load in the scope that desulphurization system can bear automatically, thereby greatly reduce the non-number of times that stops of main frame, improve the security reliability of desulphurization system simultaneously.
The utility model embodiment provides the system of a kind of desulfurization fume heat exchanger RB; selection by the logic judgement under various different operating modes and the method for operation with control strategy; automatically complete the load of unit is down to current operational outfit and is allowed the corresponding target load of exerting oneself; maintain unit major parameter (load, flue gas, cigarette temperature) in allowed band; after operating mode is stable, manually drop into a set of GGH stand-by provision increasing; make unit energy continue operation; thereby greatly reduce the non-number of times that stops of unit, guarantee the operation of unit.
As shown in Figure 1, be the structural representation of the system of the desulfurization fume heat exchanger RB of the utility model embodiment, described system comprises:
PLC controller 1, Boiler Furnace Safeguard Supervisory System (Furnace Safety Supervision System, FSSS) 2, desulfurization DCS system 3 and unit cooperative system 4; Wherein, described PLC controller 1 is connected with described Boiler Furnace Safeguard Supervisory System 2, desulfurization DCS system 3 and unit cooperative system 4; Described PLC controller 1 is set the trigger condition of described desulfurization fume heat exchanger RB, in the time meeting the trigger condition of described desulfurization fume heat exchanger RB, control described unit cooperative system 4 and be switched to machine following state by stove with machine state, and control the desulfurization accident spray system of opening in described desulfurization DCS system 3; Described PLC controller 1 is set desulfurization fume heat exchanger RB target load and load reduction of speed rate, in the time meeting the trigger condition of described desulfurization fume heat exchanger RB, described desulfurization fume heat exchanger RB target load and load reduction of speed rate are placed to the load loop of described unit cooperative system 4, and control described Boiler Furnace Safeguard Supervisory System 2 according to the number of units of the coal pulverizer of operation, the coal pulverizer that trips, delivers to boiler master using fuel value corresponding to described desulfurization fume heat exchanger RB target load as fuel command.
Further, in the present embodiment, the trigger condition of the desulfurization fume heat exchanger RB that described PLC controller 1 is set comprises: the actual load of described desulfurization fume heat exchanger is not less than described desulfurization fume heat exchanger RB target load; Described desulfurization fume heat exchanger full cut-off; And described unit cooperative system has dropped into stove with machine state.
Further, in the present embodiment, described PCL controller 1 is controlled described Boiler Furnace Safeguard Supervisory System 2 according to the number of units of the coal pulverizer of operation, the jumping mill principle of coal pulverizer of tripping is: jump operation coal pulverizer the superiors mill without time delay, from top to bottom sequentially tripping with the reality of interval 5S, other coal pulverizers are also final retains three coal pulverizers operations of the bottom, and jumping is ground to instruction and deliver to Boiler Furnace Safeguard Supervisory System 2.
Further, in the present embodiment, described PLC controller 1 is also for after triggering as desulfurization fume heat exchanger RB, if unit actual load and desulfurization fume heat exchanger RB target load difference meet while being less than preset difference, trigger desulfurization fume heat exchanger RB involution, to drop into desulfurization fume heat exchanger work for subsequent use.
Further, in the present embodiment, on described PLC controller 1, also comprise involution button, for involution manually, to trigger the artificial involution of desulfurization fume heat exchanger RB, to drop into desulfurization fume heat exchanger work for subsequent use.
In the present embodiment, PLC controller is autonomous control system, can pass through general processor, or digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic realization, and adopt hardwire or connect based on MODBUS communications protocol; The concrete enforcement of described desulfurization slurry circulating pump RB function can realize in hardware, software, firmware or this three's any combination.
Corresponding to said method embodiment, as shown in Figure 2, for utilizing the system of desulfurization fume heat exchanger RB of the utility model embodiment to carry out the method flow diagram of flue gas heat-exchange unit RB, described method comprises:
Step S101, the trigger condition of setting desulfurization fume heat exchanger RB;
Step S102, in the time meeting the trigger condition of described desulfurization fume heat exchanger RB, unit cooperative system is switched to machine following state by stove with machine state, open desulfurization accident spray equipment, the desulfurization fume heat exchanger RB target load of setting and load reduction of speed rate are placed to the load loop of described unit cooperative system, and according to the number of units of the coal pulverizer of operation, coal pulverizer trips, fuel value corresponding to described desulfurization fume heat exchanger RB target load delivered to boiler master as fuel command, to avoid the unplanned stoppage in transit of unit simultaneously.
Further, in the present embodiment, the trigger condition of described desulfurization fume heat exchanger RB comprises: the actual load of described desulfurization fume heat exchanger is not less than described desulfurization fume heat exchanger RB target load; Described desulfurization fume heat exchanger full cut-off; And described unit cooperative system has dropped into stove with machine state.
Further, in the present embodiment, described according to the number of units of the coal pulverizer of operation, the jumping mill principle of coal pulverizer of tripping is: jump operation coal pulverizer the superiors mill without time delay, from top to bottom sequentially tripping with the reality of interval 5S, other coal pulverizers are also final retains three coal pulverizers operations of the bottom, and jumping is ground to instruction and deliver to Boiler Furnace Safeguard Supervisory System.
Further, in the present embodiment, described method also comprises: after desulfurization fume heat exchanger RB triggers, if meeting, unit actual load and desulfurization fume heat exchanger RB target load difference be less than preset difference or operations staff's hand resetting, trigger desulfurization fume heat exchanger RB involution, to drop into desulfurization fume heat exchanger work for subsequent use.
The technique scheme of the utility model embodiment has following beneficial effect: by designing the system of this new desulfurization fume heat exchanger RB function, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, in the time that stopping, desulfurization fume heat exchanger fault avoids the negative effect bringing to coal fired power generation unit operation after the dismounting of desulfurization by-pass damper and flue shutoff, realizing desulfurizer synchronizes with boiler main frame, for a long time, stable operation, greatly reduce the generation that stops the unplanned stoppage in transit of unit that fault causes due to desulfurization fume heat exchanger, for guaranteeing unit safety operation, reduce the unplanned stoppage in transit number of times of unit and there is decisive meaning, unit safety to Power Plant Side and the power supply safety of grid side all play important effect.
Below in conjunction with application example, the such scheme of the utility model embodiment is described in detail:
The GGH device of general power plant only has a set of, and this programme has increased a set of stand-by provision, and the equipment that newly increases is daily in shut down condition, and regularly no-load running, can be in place if desired in time.And at absorption tower entrance increase accident spray equipment, be mainly used in spray under accident condition and reduce flue-gas temperature, prevent that flue-gas temperature from exceeding the temperature that the anti-corrosion materials such as absorption tower can bear.At GGH device stoppage in transit interlocking unlatching accident spray equipment.
GGH stops transport and is different from blower fan RB and can causes the fluctuation of furnace pressure, just desulphurization system is had to impact, can not affect greatly main frame and miscellaneous equipment, its rapidity requirement does not have the RB of main frame to require so fast yet, main target is to reduce load, reduce exhaust gas volumn, so in the time there is GGH device tripping operation RB, load shedding speed is designed to 300MW/min.
For the unit of 600MW, can design and build shown in following Fig. 3 of control logic, 4 of desulfurization fume heat exchanger RB according to the existing RACS of Power Plant DCS System and PLC controller.Wherein, Fig. 3 is the logical schematic of the utility model one application example desulfurization fume heat exchanger RB; Fig. 4 is tripping operation coal pulverizer step and the time logical schematic of the utility model one application example desulfurization fume heat exchanger RB.
In Fig. 3, designed logic has contained 3 subsystems of power plant, comprises Boiler Furnace Safeguard Supervisory System (Furnace Safety Supervision System, FSSS), desulfurization DCS system and unit cooperative system.Adopt GGH stoppage in transit signal as triggering GGH RB operation condition, according to Actual combustion result of the test, the coal pulverizer number of units retaining after the coal pulverizer number of units of tripping operation and RB after decision RB triggers; By the target load setting after flue gas flow and flue-gas temperature decision RB and the maximum unit output value of desulphurization system representative, specific practice is simultaneously:
1, the triggering of desulfurization fume heat exchanger RB: when actual load is not less than 300MW and in the time that flue gas heat-exchange unit stopping time and unit cooperative system have dropped into stove with machine state, triggers flue gas heat-exchange unit RB and occur.
2, the switching of unit control mode: once flue gas heat-exchange unit RB triggers, be switched to machine following state by stove with machine state by unit cooperative system.
The input of 3, desulfurization accident spray system: once flue gas heat-exchange unit RB triggers, automatically drop into desulfurization accident spray system.
4, RB target load and load shedding speed: once flue gas heat-exchange unit RB triggers, flue gas heat-exchange unit RB target load 300MW and load reduction of speed rate 300MW/Min are placed to the load loop of unit cooperative system, and the 300MW corresponding fuel quantity of loading is delivered to boiler master as fuel command.
5, jump time consuming and step (as shown in Figure 4): once flue gas heat-exchange unit RB triggers, by according to the number of units of the coal pulverizer of unit operation, the step of coal pulverizer trips, jumping mill principle is: jump the superiors' mill without time delay, from top to bottom sequentially tripping with the reality of interval 5S, other coal pulverizer is also final retains three coal pulverizers operations of the bottom, and jumping is ground to instruction and deliver to Boiler Furnace Safeguard Supervisory System.Shown in table 1 specific as follows:
Table 1
6, RB involution: after flue gas heat-exchange unit RB triggers, unit actual load and R B target load difference meet and be less than 20MW or operations staff's hand-reset (as shown in Figure 3), and flue gas heat-exchange unit RB involution condition is satisfied.
7, after flue gas heat-exchange unit RB involution, under the stable operating mode of the principal parameters such as main unit load, combustion chamber draft, flue-gas temperature, can drop into a set of new GGH drive unit for subsequent use, make unit can recover the variable load operation under nominal situation.
According to above-mentioned design and test data, carry out actual flue gas heat-exchange unit RB test in certain power plant:
Unit load 600MW before test, A, B, C, D, five coal pulverizers operations of E, the operation of unit commitment coordination mode, load and vapour pressure are stable, by the operations staff of the power plant flue gas heat-exchange unit of manually stopping transport, trigger flue gas heat-exchange unit RB action after 3 seconds:
---after → RB occurs, trigger desulfurization accident spray system without time delay with maximum rate and start;
---→ unit cooperative control mode is coordinated to be automatically switched to machine by stove with machine and is followed mode, unit load is down to 300MW by 600MW with the speed of 300MW/MIN, set sliding pressure variable Rate 0.21MPa/Min, set sliding pressure desired value and be down to 14.1MPa from 16.5Mpa, locking increases machine comprehensive valve bit instruction;
---after → Boiler Furnace Safeguard Supervisory System RB occurs, jump E mill without time delay, then the 10 seconds tripping operation D in interval grind final three (A, B, C) coal pulverizer operations of the bottom that retain.
---→ RB reset target load is 300MW by experiment calculation.
---all important automatic control systems of → main frame (comprise send, air inducing and primary air fan, main steam temperature, steam water-level) all keep automatic adjustment state, maintain the stable of combustion chamber draft, air output, primary air pressure, steam water-level, main steam temperature.
Furnace pressure actual value is up to 0.17kPa, minimum to-0.78kPa, all in the very safe working range of adjusting parameter.Flue gas heat-exchange unit RB triggers after 17 minutes hand resetting under the stable state of host parameter, drops into a set of new flue gas heat-exchange unit drive unit for subsequent use, success of the test by operations staff.The flue-gas temperature conditional curve of the present embodiment as shown in Figure 5.As seen from Figure 5, before flue gas heat-exchange unit stops, 82 ℃ of flue-gas temperatures before accident spray, 50 ℃ of FGD outlet cigarette temperature, stop transport and trigger flue gas heat-exchange unit RB when flue gas heat-exchange unit, after accident spray equipment drops into, after accident spray, flue-gas temperature is down to 49 ℃ of left and right, and FGD outlet cigarette temperature is more steady in whole flue gas heat-exchange unit RB process, there are not obvious rising and temperature decline phenomenon, illustrate that the function of flue gas heat-exchange unit RB design has played good systems stabilisation effect.
The system of the desulfurization fume heat exchanger RB of the utility model embodiment has following beneficial effect: by designing the system of this new desulfurization fume heat exchanger RB function, desulfurization main equipment and host groups equipment are controlled and safeguarded according to same standard and requirement, in the time that stopping, desulfurization fume heat exchanger fault avoids the negative effect bringing to coal fired power generation unit operation after the dismounting of desulfurization by-pass damper and flue shutoff, realizing desulfurizer synchronizes with boiler main frame, for a long time, stable operation, greatly reduce the generation that stops the unplanned stoppage in transit of unit that fault causes due to desulfurization fume heat exchanger, for guaranteeing unit safety operation, reduce the unplanned stoppage in transit number of times of unit and there is decisive meaning, unit safety to Power Plant Side and the power supply safety of grid side all play important effect.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the utility model embodiment lists, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize by hardware or software the designing requirement of depending on specific application and whole system.Those skilled in the art can, for every kind of specific application, can make in all sorts of ways and realize described function, but this realization should not be understood to exceed the scope of the utility model embodiment protection.
Various illustrative logical block described in the utility model embodiment, or unit can pass through general processor, digital signal processor, special IC (ASIC), field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor can be also any traditional processor, controller, microcontroller or state machine.Processor also can be realized by the combination of calculation element, for example digital signal processor and microprocessor, and multi-microprocessor, a Digital Signal Processor Core of one or more microprocessor associating, or any other similarly configures and realizes.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; and be not used in limit protection domain of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (3)
1. a system of desulfurization fume heat exchanger RB, is characterized in that, described system comprises stand-by provision, PLC controller and DCS RACS;
Wherein, described DCS RACS comprises Boiler Furnace Safeguard Supervisory System, desulfurization DCS system and unit cooperative system, and described PLC controller is connected with described Boiler Furnace Safeguard Supervisory System, desulfurization DCS system and unit cooperative system;
Described PLC controller is set the trigger condition of described desulfurization fume heat exchanger RB, in the time meeting the trigger condition of described desulfurization fume heat exchanger RB, control described unit cooperative system and be switched to machine following state by stove with machine state, and control the desulfurization accident spray system of opening in described desulfurization DCS system;
Described PLC controller is set desulfurization fume heat exchanger RB target load and load reduction of speed rate, in the time meeting the trigger condition of described desulfurization fume heat exchanger RB, described desulfurization fume heat exchanger RB target load and load reduction of speed rate are placed to the load loop of described unit cooperative system, and control described Boiler Furnace Safeguard Supervisory System according to the number of units of the coal pulverizer of operation, the coal pulverizer that trips, delivers to boiler master using fuel value corresponding to described desulfurization fume heat exchanger RB target load as fuel command;
Described stand-by provision is motor for subsequent use, connects described DCS RACS, for manual activation desulfurization fume heat exchanger RB.
2. the system of desulfurization fume heat exchanger RB as claimed in claim 1, it is characterized in that, on described PLC controller, also comprise involution button, for involution manually, to trigger the artificial involution of desulfurization fume heat exchanger RB, to drop into desulfurization fume heat exchanger work for subsequent use.
3. the system of desulfurization fume heat exchanger RB as claimed in claim 1, it is characterized in that, described PLC controller is autonomous control system, can pass through general processor, or digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic realization, and adopt hardwire to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320433957.6U CN203656953U (en) | 2013-07-19 | 2013-07-19 | Desulfurization GGH (gas gas heater) RB (runback) system |
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| CN201320433957.6U CN203656953U (en) | 2013-07-19 | 2013-07-19 | Desulfurization GGH (gas gas heater) RB (runback) system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106200704A (en) * | 2016-08-31 | 2016-12-07 | 广东电网有限责任公司电力科学研究院 | A kind of RB process main vapour pressure setting value operation method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200704A (en) * | 2016-08-31 | 2016-12-07 | 广东电网有限责任公司电力科学研究院 | A kind of RB process main vapour pressure setting value operation method and system |
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