CN101824328B - System for controlling oxygen content of crude gas of internal thermal upright carbonization furnace - Google Patents
System for controlling oxygen content of crude gas of internal thermal upright carbonization furnace Download PDFInfo
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- CN101824328B CN101824328B CN 200910254408 CN200910254408A CN101824328B CN 101824328 B CN101824328 B CN 101824328B CN 200910254408 CN200910254408 CN 200910254408 CN 200910254408 A CN200910254408 A CN 200910254408A CN 101824328 B CN101824328 B CN 101824328B
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Abstract
The invention discloses a system for controlling the oxygen content of crude gas of an internal thermal upright carbonization furnace, which is provided with a tandem feeding device with a transition feed bin and an automatic concentrated pipe pressure adjusting device. The feeding device is provided with an upper feed bin, the transition feed bin, and a lower feed bin, an automatic discharging device is respectively arranged between the upper feed bin and the transition feed bin and between the transition feed bin and the lower feed bin; the pressure measuring point of the automatic concentrated pipe pressure adjusting device is arranged in front of an ammonia spray head and is provided with a set of dirty gas or crude gas sampling device in which a signal damper is arranged; and a large backflow pressure tapping point of a gas fan is arranged in front of a primary cooling tower. The carbonization furnace is internally provided with a return semicoke gas and air mixed combustion device, and an adjustment valve is arranged on a return semicoke gas pipe and utilizes a remote set ratio control system. The system for controlling the oxygen content of crude gas has the function of automatically adjusting the concentrated pipe pressure, thus better solving the problem of unstable oxygen content in the original semicoke gas; the oxygen content in crude gas is controlled to be within a safe range in which the requirement that oxygen content in gas can be stably, reliably and accurately controlled to be less than 2% is satisfied, thus providing guarantee for safe production, reducing the leakage of semicoke gas, improving the quality of distilled products, reducing environmental pollution and ensuring smooth and safe operation of the primary cooling tower.
Description
Technical field
The present invention relates to the control techniques of charring furnace oxygen content of crude gas.
Background technology
Coke adopts semi-coke oven production more, and semi-coke oven mainly is made of charring furnace, coal handling system, first cold tower, electrical tar precipitator, collecting tubule etc.There are following problems in the production of tradition semi-coke oven:
1. semi-coke oven is when reinforced, and material directly falls in people's stove by passing into opening for feed, causes the raw gas in air and the stove to gang up mutually, and then affect the pressure surge in the stove, and the while is the combustion position of coal gas in the remote effect combustion chamber also; Pressure in the stove is greater than standard atmospheric pressure, and the raw gas in the stove will enter atmosphere by opening for feed, pollutes and the wasting of resources.
2. when the furnace roof opening for feed is opened, near the opening for feed raw gas runs into air and lowers the temperature, so that a part of tar condensing, the coal that temperature is lower in addition constantly enters in the stove, so that the local pressure of opening for feed reduces, thereby air is played a reversed role and is entered in the stove, and the gas-fired situation in the combustion chamber is affected, and causes the decline of furnace temperature furnace pressure.The reasonableness that distributes for the pressure and temperature of keeping whole system, have in stove, blast large quantity of air and coal gas, but owing to not controlling coal gas and air matching device, normal temperature air enters and absorbs amount of heat in the stove, increased the energy consumption of whole charring furnace, also so that the oxygen content in the raw gas can not get effective control, thereby cause that oxygen content in the stove increases, the Quality Down of coke, ash content increase etc.
Electrical tar precipitator is the important component part that upright carbonization furnace is removed coal tar in the raw gas.Electrical tar precipitator is compared with mechanical tar remover, has the characteristics such as tar efficient is high, drag losses is little, the gas processing amount is large of catching. and not only can guarantee subsequent handling to the requirement of gaseous mass, improve product recovery rate, and can obviously improve operating environment.In recent years, electrical tar precipitator is obtaining large-scale application aspect the purification of semicoke coal gas.Its principle of work is: the negative high voltage that high-voltage DC power supply produces, access corona discharge electrode (negative electrode), it with receiving electrode (anode) between produce electric field, strength of electric field namely produces corona discharge above after certain limit at negative and positive two interpolars.The gas of electric field region of flowing through this moment ionizes, and produces a large amount of ion and electronics.Can hear strong electromagnetism sound of the wind on every side.Visible purple blue corona when light is dark.Be combined with ion or electronics and the membrane inside the rush stalk is electric by particles such as the tar in the coal gas of electric field, dust, water smokes, under the effect of electrical forces to two polar motions.Because mass of the electron is little, movement velocity is fast, and spatial distribution is wide, so mainly be that the particle of membrane inside the rush stalk negative electricity moves to receiving electrode.Arrive in the precipitation pole plate and after, relies on remaining electrostatic attraction and intermolecular cohesive force at first to be adsorbed in receiving electrode, then fall along pole plate by self gravitation, by tar outlet discharge.
In electrical tar precipitator when work,, the oxygen level in double coke gas has strict requirement, when only having oxygen level in the semicoke coal gas to be not more than 2%, and the operation that electrical tar precipitator just can be safe and reliable.If the oxygen level in the semicoke coal gas surpasses 2%, and is then very easily explosion caused.Therefore the oxygen level of controlling in the semicoke coal gas is to guarantee safety in production, improves the important technique measure of product production and quality.
In the actual production of semi-coke oven, the oxygen level in the semicoke coal gas is leaned on manual shift control substantially.Owing to the oxygen level in the semicoke coal gas, melted down the impact of the many factors such as air, coal gas blending ratio and assembly pipe pressure, be a stochastic variable, artificial being difficult to controlled.If the firing tunnel in coking furnace flow is excessive or the semi-coke oven assembly pipe pressure is higher, then waste energy contaminate environment; Melt down air excess or the semi-coke oven assembly pipe pressure is on the low side, make then that oxygen level exceeds standard in the semicoke raw gas, be unfavorable for safety in production.
The utility model content
The object of the invention is to, overcome that oxygen level can not get effective control in the raw gas that exists in traditional semi-coke oven production, have a strong impact on the deficiency that operational safety, energy consumption are large and environmental pollution is serious of coke furnace system, provide a cover accurate, reliable, stable semicoke oxygen content in coal gas varitrol.
Concrete technical scheme of the present invention is as follows:
One cover assembly pipe pressure automatic-adjusting device, a cover firing tunnel in coking furnace and air mixed combustion unit, a cover semi-coke oven feeding device are arranged.
1. said semi-coke oven feeding device, its technical scheme is as follows:
Tradition semi-coke oven, its furnace roof are opening for feeds of opening greatly the position, and feed coal directly enters in the stove by this opening for feed.
Technical scheme of the present invention is: at the opening for feed place of semi-coke oven, be provided with the feeding device of seal more than, this device is divided into feeding bin, transition feed bin and blanking bin.Wherein, feeding bin is connected with coal handling system, and blanking bin is connected with semi-coke oven.The transition feed bin equates with the volume of blanking bin.Between feeding bin and transition feed bin, and between transition feed bin and the blanking bin, respectively be provided with the seal of a feeding device.On three feed bins, a cover level measurement instrument is installed respectively simultaneously, the effect of this three covers level measurement instrument is as follows:
The level measurement instrument of feeding bin (as: radio frequency admittance material level meter) is chain with coal handling system, establishes the chain warning of bound, guarantees that not only feeding bin does not lack coal, does not allow coal overflow feed bin simultaneously yet.Transition feed bin level measurement instrument (radio frequency admittance material level meter) is also established the chain warning of bound: prescribe a time limit when being on the material level, close automatic discharging device No. 1, same alarm namely possesses to blowing condition in the semi-coke oven; Prescribe a time limit when being under the material level, close first automatic discharging device No. 2, then open automatic discharging device No. 1, give blowing in the transition feed bin.Because furnace roof space constraint, blanking bin level measurement instrument (can be radio frequency admittance material level meter) are only set the chain warning of limit, when material level is in lower prescribing a time limit, open automatic discharging device No. 2, give blowing in the semi-coke oven.
This device has been strengthened the stopping property of gas retort feeding system, can the stable set pipe pressure, the pressure allowable fluctuation range that makes semicoke raw gas collecting tubule for+100Pa ~-100Pa; The semicoke raw gas does not leak during the fluctuation of pressure forward, oxygen level during the negative sense fluctuation in the semicoke raw gas is constant large, make semicoke raw gas assembly pipe pressure when occurring fluctuating among a small circle, but produce still safe operation, also reduced the operating frequency of assembly pipe pressure regulation system simultaneously.Overcome because of the fluctuation of the poor and assembly pipe pressure of the stopping property of gas retort feeding device and caused the problem that oxygen level exceeds standard in the semicoke coal gas.
2. said assembly pipe pressure automatic-adjusting device,
Traditional assembly pipe pressure device mainly is comprised of house steward, gas-collecting branch pipe, manual modulation valve, pressure measuring element.One side of this assembly pipe pressure device connects the furnace roof side of semi-coke oven, and the other side connects spray column cat head side.House steward therebetween is provided with pressure measuring element and manual modulation valve.Effuser is provided with pressure unit, and is main by manually coming its adjusting.Gas-collecting branch pipe is positioned at house steward's corner, is in bypass condition.When house steward had fault or maintenance, gas-collecting branch pipe played the by-path turn-on effect.
The present invention's assembly pipe pressure automatic-adjusting device, make improved technical scheme as follows:
A, with the pressure point position of the pressure measuring element on the semicoke raw gas collecting tubule, before changing spray ammoniacal liquor into behind the spray ammoniacal liquor, and corresponding increase by one cover raw gas sampling unit, both can play the blowdown effect, again available buffer pressure.
The pressure point of B, the large return pressure measuring sensor of gas blower is before changing into first cold tower behind the first cold tower.Semi-coke oven collecting tubule automatic-adjusting device energy fast and stable is the front pressure of cold tower just, reduces pressure surge, and then stable semi-coke oven raw gas goes out the just pressure of cold tower.
The pressure point place of C, the pressure measuring element on collecting tubule has increased deoscillator, and this deoscillator can to the pulsating pressure quick and smooth pressure of pressure point in 0.1s, improve the quality (as shown in Figure 4) of semi-coke oven collecting tubule automatic-adjusting device.
D, at the manual modulation valve that collecting tubule is installed, the immunity from interference of pneumatic actuator is better than electric operator.When not having instrument air in the building-site, can adopt electric operator.The control signal of electric operator (mainly being magnetic valve) easily is subject to the electromagnetic interference of on-the-spot other high-current equipments, in order to shield and to reduce electromagnetic interference, so, except electric operator is installed, also want supporting increase signal damping device.
3. described semicoke coal gas and the air mixed combustion unit of melting down, adopt semicoke industry temperature cascade-change ratio control commonly used, make that the air that melts down and semicoke coal gas mix in proportion fully, fully burning, thereby solved because melting down the problem that oxygen level exceeds standard in the semicoke coal gas that air excess causes.
Tradition is melted down semicoke coal gas and air mixed combustion unit, just melt down air line and semicoke feed channel installation temperature testing equipment at semi-coke oven, in the watch-keeping cubicle, detect in real time temperature, carry out the temperature contrast according to practical experience, and then the variable valve on the adjustment official road, so that the ratio that reaches cooperates, fully burning.The present invention's tradition is melted down semicoke coal gas and air mixed combustion unit, and its main Technological improvement plan is:
(1) melting down on the air line, flow measuring element is being housed respectively on the semicoke feed channel.When there is unusual meteorological conditions in the building-site area (large such as the morning and evening temperature difference, summer in the winter temperature difference is large), reply flow element body signal is set up temperature and pressure compensation or is adopted insulation companion hot mode.
(2) set up change ratio control at this device, take firing tunnel in coking furnace as constant basis, air flow quantity is melted down in preset ratio relation adjusting according to gas flow and air flow quantity during normal operation, when range of temperature is larger in the semi-coke oven, with its scale-up factor of mean value correction of all temperature spots of retort section.
(3) change the regulating butterfly valve on the former firing tunnel in coking furnace pipeline into remote manual regulating butterfly valve (switching).Keep the regulating butterfly valve on the air line, change ratio control is applied in the variable valve loop.
(4) at input terminus and the output terminal of instrument controller signal isolating device is installed respectively, with system and extraneous undesired signal isolation, is improved the Stability and veracity of system.
Melt down the intelligent controller 24 in semicoke coal gas and the air mixed combustion unit, its input and output terminal are installed respectively signal isolating device 27.
This system process is: air flow quantity and loop gas flow after change ratio control calculates adjusting, enter charring furnace.The raw gas that charring furnace produces enters the semi-coke oven collecting tubule, the pressure of raw gas is regulated being controlled in the scope of processing requirement by the assembly pipe pressure automatic-adjusting device.Raw gas and a part of backflow semicoke coal gas are mixed into just cold tower, enter the just mixture pressure of cold tower, and by the control of firing tunnel in coking furnace bypass pressure control device, guaranteeing to enter just, the gaseous tension of cold tower remains in the scope of processing requirement reposefully; Raw gas after the first cold tower of process is lowered the temperature enters electrical tar precipitator, removes the tar in the coal gas, and the coal gas after purifying through electrical tar precipitator enters follow-up relative unit, finally enters the gas blower pressurization and delivers to the coke oven use or deliver to the gas holder storage outward.Wherein the coal gas after the part purification returns just cold tower through by-pass line, and compensation is the pressure of Leng Ta ingress raw gas just, and the raw gas pressure that enters first cold tower is maintained in the scope of processing requirement, guarantees just cold tower smooth running.
The present invention is provided with collecting main pressure setting device and furnace roof feeding unit: increase the collecting main pressure setting device---have the function of automatic adjusting assembly pipe pressure, solved preferably the unsettled problem of oxygen level in the former semi-coke oven coal gas, with the Control for Oxygen Content in the raw gas within safety range, can stablize, control reliably, accurately oxygen content in coal gas and satisfy requirement (basicly stable 1.0% ~ 1.5% in the production process) less than 2%, and can effectively control and enter just that the pressure of cold tower raw gas guarantees the just steadily operation of safety of cold tower.Also reduced simultaneously the leakage of semicoke coal gas, reduced environmental pollution, and can effectively control the just intake pressure of cold tower raw gas, this pressure mainly adopts the mode of bypass backflow part coal gas to compensate and enters just cold tower, to guarantee just steadily safely operation of cold tower; Guaranteed the quality of destructive distillation product.Increasing the furnace roof feeding unit, is to scurry in the stove and effuser in order further to stop air, reduces the oxygen level in the raw gas.
Below in conjunction with embodiments of the invention of accompanying drawing narration, the present invention will be further described.
Description of drawings
Fig. 1 is burnt raw gas assembly pipe pressure setting device schematic diagram of the present invention;
Fig. 2 is furnace roof feeding device schematic diagram of the present invention;
Fig. 3 is temperature cascade of the present invention-than value adjusting device schematic diagram.
Embodiment is as follows
Fig. 1 shows the structure of the present embodiment semicoke raw gas assembly pipe pressure setting device, mainly contains: raw gas sampling unit 1, deoscillator 2, differential pressure transmitter 3, signal damping device 4, intelligent adjustment control 5, electric operator 6 (electric butterfly valve), variable valve 7, semi-coke oven collecting tubule 8.Its functions and act on as follows:
(1) function of raw gas sampling unit 1: isolate the impurity in the raw gas medium, the while is available buffer pressure again.
(2) function of deoscillator 2: to the pulsating pressure quick and smooth pressure of pressure point, improve the quality of regulation system.
(3) function of differential pressure transmitter 3: the current signal that pressure signal is converted to 4～20mA.The function of signal damping device:
(4) function of signal damping device 4 is used for Noise and Interference signal in the filtered signal, plays the smooth signal effect.It provides adjustable first-order lag link, in order to compensate and to improve the dynamic property of regulation system.
(5) function of intelligent adjustment control 5 is accepted the pressure signal of 4～20mA of differential pressure transmitter.According to preseting, the valve position signal that intelligent electric actuating mechanism feeds back is accepted in the action of control intelligent electric actuating mechanism simultaneously, and is biased poor with surge valve.
(6) function of electric operator 6 (electric butterfly valve) is carried out the conditioning signal that intelligent adjustment control provides, and the valve position signal after will moving feeds back to intelligent adjustment control.
(7) function of variable valve 7, variable valve 7 belongs to internally piloted valve, will control after the signal input.Use butterfly valve directly to be connected with electric operator in this example, open or close according to the action situation of topworks, change the flow area of fluid, regulate line pressure with this.
(8) function of semi-coke oven collecting tubule 8, semi-coke oven collecting tubule are the pipelines that the semi-coke oven side is connected to the spray column side.Pressure on the semi-coke oven collecting tubule is the technology control target of this system.
The pressure signal of semi-coke oven collecting tubule, after raw gas sampling unit 1 decontamination buffering, enter deoscillator 2, deoscillator 2 in 0.1 second with after this pulsating pressure quick and smooth voltage stabilizing, enter differential pressure transmitter 3, differential pressure transmitter 3 enters signal damping device 4 after line pressure signal being converted to the current signal of 4～20mA, filters out Noise and Interference signal in the signal by signal damping device 4, and will introduce intelligent adjustment control 5 behind the signal smoothing; Intelligence adjustment control 5 with this signal and preset signals comparative analysis after, give intelligent electric actuating mechanism 6 (being electric butterfly valve) output action signal, intelligent electric actuating mechanism 6 drives variable valve 7 actions according to actuating signal, change the flow area of fluid, come modification stability semi-coke oven assembly pipe pressure with this; Intelligent electric actuating mechanism 6 feeds back to intelligent adjustment control 5 with the valve position signal after the action, with surge valve bit motion deviation simultaneously.
The self-regulating process of this semi-coke oven assembly pipe pressure is as follows:
A, the large backflow Controlling System of gas blower
According to field working conditions, the setter set-point is put a 2000Pa, and electromotive signal deoscillator T damping time puts 1s, and proportional band δ puts 80%～150%, integral time T
1Put 20～30s, differential time T
DPut 5s, manual/auto switch is put manually.
Manually opened blower inlet valve, the aperture of remote control electric butterfly valve, make gradually the aperture of butterfly valve reach 30%, when observed value equals set-point, manual/auto switch is put automatically, and large return-flow system is thrown the people and automatically moved, in view of aperture and the flow of butterfly valve substantially linear, under the normal gas yield of semi-coke oven, the aperture of Pneumatic butterfly valve 30% has larger up-down adjustment leeway, when the semi-coke oven gas yield reduces, butterfly valve opening increases automatically, increase quantity of reflux, the pressure before the first cold tower of fast and stable is when gas yield increases, and butterfly valve turns down automatically, reduce quantity of reflux, rapidly the pressure before the stable just cold tower.So the automatic superperformance of regulating of the large backflow of gas blower has been created essential condition for realizing that semi-coke oven raw gas pressure is regulated automatically.
D, semi-coke oven raw gas assembly pipe pressure Controlling System
According to field working conditions, the setter set-point is put a 20Pa, and electromotive signal deoscillator T damping time puts 3s, and proportional band δ puts 100%～200%, integral time T
1Put 15～30s, differential time T
DPut 5s, manual/auto switch is put manually.Simultaneously the valve position signal specification error is compensated.
The aperture of remote control electric butterfly valve, when observed value equaled set-point, manual/auto switch was put automatic operation, after putting into operation, had realized that the pressure of semi-coke oven raw gas assembly pipe pressure 0 ± 50Pa is regulated automatically, had satisfied the safe operation of producing.
Fig. 2 shows the structure of the furnace roof feeding device of the present embodiment, mainly contain: upper coal belt 9, feeding bin 10, transition feed bin 11, blanking bin 12, semi-coke oven 13, transition feed bin top electricity push-pull valve 14, the transition feed bin bottom electricity parts such as push-pull valve 15, radio frequency admittance material level meter 16 of surging of surging form semi-coke oven furnace roof feeding device.Its functions and act on as follows:
(1) upper coal belt 9 supplies raw materials for the furnace roof feeding device.
(2) feeding bin 10, the raw material that the coal belt is sent here in the storage.
(3) the transition feed bin 11, and the storage feeding bin is put into the raw material of sending here, and then raw material is put into blanking bin.
(4) blanking bin 12, are connected as a single entity with semi-coke oven 13, and the raw material that reception transition feed bin is put into enters semi-coke oven.
(5) the transition feed bin top electricity push-pull valve 14 that surges, whether the charging of control transition feed bin.
(6) the transition feed bin bottom electricity push-pull valve 15 that surges, whether the charging of control blanking bin.
(7) radio frequency admittance material level meter 16, deliver to intelligence control system with measuring each the material level signal that comes, and realize semi-coke oven sealing autofeed.
The radio frequency admittance material level meter 16 of feeding bin 10 is chain with coal handling system, guarantees that feeding bin 10 can not lack coal, can not allow coal overflow feed bin, so this radio frequency admittance material level meter 16 is established the chain warning of bound.Transition feed bin 11 radio frequency admittance material level meters 16 are also established the chain warning of bound, close the electricity push-pull valve 14 that surges in transition feed bin top on the material level in limited time when being in, same alarm, namely possess to blowing condition in the semi-coke oven, when being in the automatic discharging device of closing first transition feed bin bottom in limited time under the material level---the electricity push-pull valve 15 that surges, then open transition feed bin top electricity and surge push-pull valve 14 to blowing in the transition feed bin.Because furnace roof space constraint, the blanking bin radio frequency admittance material level meter is only set the chain warning of limit, when material level be in lower in limited time in the situation that transition feed bin top electricity surges push-pull valve 14 close open transition feed bin bottom electricity surge push-pull valve 15 to semi-coke oven in blowing, reach semi-coke oven sealing autofeed.
The automatic adjusting working process of this feeding device is as follows: close first the electric brake plate valve No. 2, then open the electric brake plate valve No. 1, give in the transition feed bin material is piled, again No. 1 electric brake plate valve cuts out, and then open No. 2 electric brake plate valves to blowing in the semi-coke oven.This process adopts intelligent controller (this example adopts small PLC) control, all orders and chain all in the inner realization of intelligent controller.Be defined as 15～20min pitch time according to the site specific blowing.
Fig. 3 shows the temperature cascade of the present embodiment-than the structure of value adjusting device.
Mainly contain: temperature transmitter 17, temperature regulation controller 18, melt down air flowmeter 19, melt down air flow quantity transmitter 20, firing tunnel in coking furnace under meter 21, firing tunnel in coking furnace flow transmitter 22, divider 23, ratio adjustment control 24, electric operator 26 (electric butterfly valve), signal isolator 27.Each several part connects by corresponding structure, forms temperature cascade-compare value adjusting device.Its functions and act on as follows:
Temperature transmitter 17 converts Thermocouple Temperature Signal to the current signal of 4～20mA.
Temperature regulation controller 18 is accepted the temperature signal of 4～20mA of temperature transmitter, according to preseting the action of control intelligent electric actuating mechanism, regulates the firing tunnel in coking furnace flow.
Melt down air flowmeter 19, the flow of air is melted down in the on-line continuous measurement.
Melt down air flow quantity transmitter 20, will melt down the current signal that air flow quantity converts 4～20mA to.
Firing tunnel in coking furnace airshed meter 21, on-line continuous is measured the flow of firing tunnel in coking furnace.
Firing tunnel in coking furnace flow transmitter 22 converts the firing tunnel in coking furnace flow to the current signal of 4～20mA.
Divider 23 calculates the ratio of melting down air flow quantity and firing tunnel in coking furnace flow.
Ratio adjustment control 24, receive the ratio of melting down air flow quantity and firing tunnel in coking furnace flow that divider calculates, according to preseting the action of control intelligent electric actuating mechanism, regulate the firing tunnel in coking furnace flow, keep the suitable ratio of melting down air flow quantity and firing tunnel in coking furnace flow.
Electric operator 25, the conditioning signal of execution adjustment control 24, and the valve position signal after will moving feeds back to adjustment control 24.
Butterfly valve 26 directly is connected 26 with electric operator, according to the action situation of topworks or open or close, changes the flow area of fluid, regulates the pipeline rate-of flow with this.
The function of signal isolator 27: the undesired signal in the isolated system, the protection control loop slackens neighbourhood noise to the impact of test circuit, improves the accuracy of system.
According to the process characteristic of semicoke, selecting pyrolysis temperature is main controlled parameter, and firing tunnel in coking furnace is secondary controlled parameter with the ratio that melts down the flow of air, forms temperature cascade-ratio control.In the normal situation of semi-coke oven pyrolysis temperature, by the flow proportional of ratio controller control loop air and firing tunnel in coking furnace, guarantee firing tunnel in coking furnace fully cmpletely burning in stove.When pyrolysis temperature is received disturbance and when changing, the flow of regulating firing tunnel in coking furnace by temperature regulator compensates.
Its self-regulating process is as follows:
According to process condition, selecting air, gas flow ratio control loop is inner loop, and allows to change within the specific limits, and the selection temperature control loop is main ring.Master governor adopts PI to regulate, and secondary controller adopts P to regulate.
According to field working conditions, ratio controller set-point K ' puts 1.5, and master governor proportional band δ puts 60%～100%, integral time T
IPut 150～180s, secondary controller proportional band δ 30%～50% puts manual/auto switch and puts manually.
The aperture of the electric butterfly valve on the remote control circuit air line, stop when making gradually the return-air flow reach set(ting)value, the aperture of the electric butterfly valve on the remote control circuit semicoke feed channel, drop into air, gas flow ratio control loop (secondary control loop) when making gradually loop semi coke gas flow reach set(ting)value, again temperature control loop is dropped into (main control loop) after stable.After putting into operation, greatly reduced surplus air on alter problem, simultaneously also stablized the abundant burning in semi-coke oven of air, semicoke coal gas, stablized the retort section temperature of semi-coke oven.
Fig. 4 has shown semi-coke oven assembly pipe pressure adjustment structure figure of the present invention.
This pressure regulating mechanism is made of coal gas shield retaining, air isolator, deoscillator, differential pressure transmitter, signal damping device.The effect of coal gas, air isolator is: undesired signal and impurity signal in isolation coal gas, the air pressure, maintenance signal normal; The effect of deoscillator is: to the pulsating pressure quick and smooth pressure of pressure point; The effect of differential pressure transmitter is: the current signal that pressure signal is converted to 4 ~ 20mA; The effect of signal damping device is: be used for Noise and Interference signal in the filtered signal, play the smooth signal effect, adjustable first-order lag link is provided, in order to compensation with improve the dynamic property of regulation system.
Claims (8)
1. the system for controlling oxygen content of crude gas of internal thermal upright carbonization furnace, coal handling system, first cold tower, electrical tar precipitator, collecting tubule device are arranged, coal handling system is positioned at the top of charring furnace, the side of collecting tubule device one edge joint charring furnace, one edge joint is the side of cold tower just, and it is characterized in that: charging place of this charring furnace has the feed tightness system of seal more than; Assembly pipe pressure automatic-adjusting device (8) is arranged in the collecting tubule device; The semicoke of melting down coal gas and air mixed combustion unit are arranged in the charring furnace;
Described feed tightness system, be the tandem feeding device with the transition feed bin, this installs by feeding bin (10), and transition feed bin (11) and blanking bin (12) form, feeding bin (10) is connected (9) with coal handling system, blanking bin is connected with semi-coke oven (13); Between feeding bin (10) and the transition feed bin (11) and between transition feed bin (11) and the blanking bin (12), an automatic discharging device (15) is arranged respectively;
Described assembly pipe pressure automatic-adjusting device (8) is before the pressure point of its pressure measuring element is located at ammonia spray; And have one to overlap raw gas or raw gas sampling unit; In this device, be provided with signal damping device (4); Be provided with the large backflow pressure point of gas blower before the first cold tower;
Described semicoke coal gas and the air mixed combustion unit of melting down, it melts down on the semicoke feed channel variable valve; This variable valve is provided with change ratio control.
2. the system for controlling oxygen content of crude gas of described internal thermal upright carbonization furnace according to claim 1 is characterized in that: the pressure allowable fluctuation range of assembly pipe pressure automatic-adjusting device (8) for+100Pa～-100Pa.
3. the system for controlling oxygen content of crude gas of described internal thermal upright carbonization furnace according to claim 1, it is characterized in that: transition feed bin (11) equates with the volume of blanking bin (12).
4. the system for controlling oxygen content of crude gas of described internal thermal upright carbonization furnace according to claim 1, it is characterized in that: said between feeding bin (10) and the transition feed bin (11) and between transition feed bin (11) and the blanking bin (12), an automatic discharging device (15) is respectively arranged, and this automatic discharging device is the electric brake plate valve.
5. the system for controlling oxygen content of crude gas of described internal thermal upright carbonization furnace according to claim 1 is characterized in that: a cover article position measuring device (16) respectively is installed on each feed bin.
6. the system for controlling oxygen content of crude gas of described internal thermal upright carbonization furnace according to claim 1 is characterized in that: melting down the variable valve on the semicoke feed channel of melting down of semicoke coal gas and air mixed combustion unit, is that remote manual opens and closes.
7. the system for controlling oxygen content of crude gas of described internal thermal upright carbonization furnace according to claim 1, it is characterized in that: applied change ratio control, adopt ratio adjustment control (24), at its input terminus and output terminal, be separately installed with signal isolating device (27).
8. the system for controlling oxygen content of crude gas of described internal thermal upright carbonization furnace according to claim 5, it is characterized in that: a cover article position measuring device (16) respectively is installed on each feed bin, and this device is radio frequency admittance material level meter; Radio frequency admittance material level meter and the coal handling system of feeding bin are chain, establish the chain warning of bound; Transition feed bin radio frequency admittance material level meter is also established the chain warning of bound; The blanking bin radio frequency admittance material level meter is set the chain warning of limit.
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| CN102994112B (en) * | 2011-12-21 | 2014-06-11 | 山西鑫立能源科技有限公司 | Preheated coal leading-in device of coal pyrolyzing furnace |
| CN102786957B (en) * | 2012-08-06 | 2014-07-30 | 山西鑫立能源科技有限公司 | Coal as fired regulation method for coal pyrolyzing furnace |
| CN109946425A (en) * | 2019-03-20 | 2019-06-28 | 无锡市博精电子有限公司 | A kind of ammonia leakage alarming device for ammonolysis craft system |
| CN110244803A (en) * | 2019-05-22 | 2019-09-17 | 中冶焦耐自动化有限公司 | A kind of coke oven positive pressure furnace system and temprature control method |
| CN110616079B (en) * | 2019-09-27 | 2021-02-09 | 中冶焦耐(大连)工程技术有限公司 | Coal charging process for reducing emission of sulfur dioxide from source |
| CN111142388A (en) * | 2020-01-14 | 2020-05-12 | 湖南文理学院 | Variable ratio control method for chemical process |
| CN117229800B (en) * | 2023-09-19 | 2024-05-03 | 府谷县泰达煤化有限责任公司 | Semi-coke production device |
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| CN201660594U (en) * | 2009-12-21 | 2010-12-01 | 西安理研工控科技有限公司 | Crude gas oxygen content control system of internal heated vertical carbonization furnace |
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