CN110511768B - Coke oven heating combustion control method and system - Google Patents
Coke oven heating combustion control method and system Download PDFInfo
- Publication number
- CN110511768B CN110511768B CN201910829111.6A CN201910829111A CN110511768B CN 110511768 B CN110511768 B CN 110511768B CN 201910829111 A CN201910829111 A CN 201910829111A CN 110511768 B CN110511768 B CN 110511768B
- Authority
- CN
- China
- Prior art keywords
- waste gas
- air inlet
- suction
- valve
- flue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
- C10B21/16—Regulating and controlling the combustion by controlling or varying the openings between the heating flues and the regenerator flues
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
- C10B21/18—Recirculating the flue gases
Abstract
A coke oven heating combustion control method and a system thereof, wherein the method comprises the following steps: s1: calculating the air intake required by a single combustion chamber according to the single-pipe coal gas amount; s2: the opening degree of an air inlet of the single regenerator is adjusted according to the air inlet amount required by the single combustion chamber; s3: correcting the opening of an air inlet of the heat storage chamber according to the deviation variation range of the downdraft top storage suction force of the heat storage chamber and the top storage suction force of a standard heat storage chamber; s4: adjusting the opening of an air inlet according to the oxygen content data feedback of the small flue at the bottom of the regenerator; s5: adjusting the amount of external circulating waste gas according to the air inlet amount of the regenerator; s6: the amount of externally circulated exhaust gas is corrected in accordance with the temperature of the furnace-top space. The invention provides an optimized air inlet flow control structure transformation scheme, which reduces the damage to the original coke oven structure to the maximum extent and realizes the automatic adjustment of the air amount in the combustion process.
Description
Technical Field
The invention belongs to the technical field of coke oven heating combustion control, and particularly relates to a coke oven heating combustion control method and a coke oven heating combustion control system.
Background
With the rapid development of the coking industry and the enhancement of the environmental protection consciousness of China, the research on how to improve the process efficiency of the coke oven as a large energy consumption household and a large environment pollution household to achieve real energy conservation and emission reduction is paid attention to by people.
The existing coke oven heating intelligent control technology mainly adopts heat input square gas quantity adjustment as a main means, and in order to reduce the high temperature of a vertical flue and reduce the emission of nitrogen oxides, part of manufacturers and patent documents mention that an external waste gas circulating device for diluting combustion-supporting gas by waste gas has an obvious effect on controlling the emission of NOx, but the waste gas quantity can increase the volume of the combustion gas of the coke oven, so that the integral pressure in the coke oven is influenced to a certain extent.
In order to address this phenomenon, some manufacturers refer to the advantage of combining the two-way functions of optimizing combustion control and exhaust gas circulation to achieve the effects of stabilizing combustion and reducing nitrogen oxides. However, the above technical regulation is to use the input of the adjusted coal gas amount and the suction of the branch flue as the main means of combustion in each combustion chamber, neglecting the effect of adjusting the air-waste gas amount of each combustion chamber, especially when the external waste gas is circularly injected into the air system, adjusting the total mixed gas amount of all combustion chambers by using the suction of the branch flue alone, which is easy to cause uneven distribution of mixed gas in each combustion chamber, unstable combustion condition, improper distribution ratio of air and flue gas amount, and easy to cause the accumulation of surplus air amount in the vertical flue, resulting in over-high local flame temperature, and is not beneficial to uniform high-direction heating of the carbonization chamber and stable pressure distribution of the whole furnace, and is also beneficial to realizing the environmental protection emission control requirement, and increasing the cost control of the later stage waste gas desulfurization and denitration treatment.
Disclosure of Invention
To solve the above problems, the present invention provides: a coke oven heating combustion control method, the method comprising the steps of:
s1: calculating the air intake required by a single combustion chamber according to the single-pipe coal gas amount;
s2: the opening degree of an air inlet of the single regenerator is adjusted according to the air inlet amount required by the single combustion chamber;
s3: correcting the opening of an air inlet of the heat storage chamber according to the deviation variation range of the downdraft top storage suction force of the heat storage chamber and the top storage suction force of a standard heat storage chamber;
s4: adjusting the opening of an air inlet according to the oxygen content data feedback of the small flue at the bottom of the regenerator;
s5: adjusting the amount of external circulating waste gas according to the air inlet amount of the regenerator;
s6: the amount of externally circulated exhaust gas is corrected in accordance with the temperature of the furnace-top space.
The invention also provides a coke oven heating combustion control system, which comprises:
the furnace top space temperature feedback control module is used for judging the heating height uniformity of the coke cake according to the collected raw coke oven gas temperature data, and adjusting the opening degree of an external circulating waste gas branch pipe valve of the corresponding combustion chamber to change the mixing amount of waste gas when the temperature is lower than a set threshold value; the furnace top space temperature feedback control module comprises a raw gas temperature acquisition module at an ascending pipe and an external circulation waste gas branch pipe valve, the raw gas temperature acquisition module is used for acquiring the temperature of the raw gas, and the external circulation waste gas branch pipe valve is used for adjusting the opening degree of the external circulation waste gas branch pipe valve to change the mixing amount of waste gas;
the circulating waste gas-gas feedforward control module is used for starting an air quantity-external waste gas circulating quantity automatic control flow when the opening degree of the gas branch pipe valve is adjusted to exceed a set threshold value; the circulating waste gas-coal gas feedforward control module comprises a single-hole coal gas flow regulating valve, an air inlet regulating valve and the external circulating waste gas branch valve; the single-hole gas flow regulating valve is used for regulating the opening degree of the gas branch pipe valve, the air inlet regulating valve is used for regulating the content of air entering through the air inlet, the external circulation waste gas branch pipe valve is used for regulating the mixing amount of waste gas, and the air inlet regulating valve and the external circulation waste gas branch pipe valve jointly form the automatic air amount-external waste gas circulation amount control flow;
the top storage suction coordination control module is used for judging whether the opening of an air inlet of the waste gas tray and the opening of an adjusting valve of an external circulation waste gas branch pipe reach a target opening or not according to the collected descending airflow top storage suction value and oxygen content data; the top storage suction coordination control module comprises a downdraft top storage suction acquisition module, an oxygen content data acquisition module, a waste gas disc air inlet regulating valve and an external circulation waste gas regulating valve; the downdraft top-storage suction collecting module is used for collecting downdraft top-storage suction values, the oxygen content data collecting module is used for collecting oxygen content data at the bottom of the heat storage chamber, the waste gas disc air inlet adjusting valve is used for adjusting the opening degree of a waste gas disc air inlet, and the external circulation waste gas adjusting valve is used for adjusting the opening degree of an external circulation waste gas branch pipe;
the sub-flue and storage top suction force coordination control module is used for judging whether the opening degree and the overshoot number of the waste gas disc air conditioning valve reach limit values or not according to the collected descending airflow storage top suction force value and the collected sub-flue total suction force value, and starting a sub-flue suction force baffle plate to automatically adjust and realize the balanced distribution of storage top suction force again when the opening degree and the overshoot number reach the limit values; the sub-flue and storage top suction coordination control module comprises a descending airflow storage top suction acquisition module, a sub-flue suction data acquisition module, a waste gas disc air conditioning valve and a sub-flue suction adjustment valve; the descending airflow top-storage suction collecting module is used for collecting a descending airflow top-storage suction value, the sub-flue suction data collecting module is used for collecting a sub-flue suction value, the waste gas disc air conditioning valve is used for adjusting the opening degree of the sub-flue suction adjusting valve, and the sub-flue suction adjusting valve is used for starting the sub-flue suction baffle automatic adjustment.
Preferably, the waste gas dish air intake governing valve is installed in waste gas dish air apron below air intake department.
Preferably, the waste gas tray air inlet adjusting valve comprises a vent connected with the bottom of the air inlet, a pneumatic actuator is arranged on a first outer side surface of the vent, a positioner is arranged outside the pneumatic actuator, a pneumatic linkage is communicated between the pneumatic actuator and the positioner, a plurality of louver boards are arranged in the vent, two ends of a connecting rod mechanism are arranged on the vent and sequentially penetrate through all the louver boards, a driving rod is arranged on the louver boards in an extending manner towards the pneumatic actuator, and the driving rod is inserted into the pneumatic actuator, wherein the louver boards have a first state and a second state, and when the louver boards are in the first state, all the louver boards do not block the vent; when in the second state, all of the louvres collectively close the vent.
Compared with the prior art, the invention has the advantages that:
(1) the optimized air inlet flow control structure is improved, the damage to the original coke oven structure is reduced to the maximum extent, and the automatic adjustment of the air quantity in the combustion process is realized.
(2) The air quantity and the circulating waste gas quantity are controlled through the change of the coal gas quantity and the change of the heat load requirement, reasonable air-coal ratio distribution can be realized, the sensible heat of waste gas brought away by redundant air is reduced, and the coal gas quantity is saved.
(3) The accurate control waste gas mixing volume reduces the gaseous oxygen concentration of mixing, reduces the high-temperature concentration district of flame, obviously improves the vertical flue height and to the heating homogeneity, improves the coke quality.
(4) The influence of the mixing of the circulating waste gas on the fluctuation of the suction force of a single storage top is reduced, and the uniformity of the suction force of the storage top is obviously improved.
(5) The opening degree of air and circulating waste gas is not required to be adjusted manually, the labor intensity of fire adjusting workers is greatly reduced, and the hysteresis and the measurement error caused by manual adjustment are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a coke oven heating combustion control method provided by the invention;
FIG. 2 is a schematic diagram of the composition of a coke oven heating combustion control system provided by the invention;
FIG. 3 is a schematic flow chart of the coke oven heating combustion control system of FIG. 2;
FIG. 4 is a diagram of a coke oven heating combustion control model of a coke oven heating combustion control system provided by the invention;
FIG. 5 is a schematic view of an air-circulating exhaust gas regulation control modification structure of a coke oven heating combustion control method and system provided by the invention;
FIG. 6 is a schematic view of the exhaust disc air inlet damper valve of FIG. 5;
FIG. 7 is a schematic flow chart of an air quantity regulation control method under exhaust gas circulation in a coke oven heating combustion control system provided by the invention;
FIG. 8 is a flow chart of a single tube air-circulating exhaust gas quantity regulation model control 30min before exchange for a coke oven heating combustion control system according to the present invention;
FIG. 9 is a control flow chart of a single-pipe air-circulating exhaust gas amount regulation model 30min after switching of a coke oven heating combustion control system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1, the invention provides a coke oven heating combustion control method, which specifically comprises the following steps:
s1: calculating the air intake required by a single combustion chamber according to the single-pipe coal gas amount;
s2: the opening degree of an air inlet of the single regenerator is adjusted according to the air inlet amount required by the single combustion chamber;
s3: correcting the opening of an air inlet of the heat storage chamber according to the deviation variation range of the downdraft top storage suction force of the heat storage chamber and the top storage suction force of a standard heat storage chamber;
s4: adjusting the opening of an air inlet according to the oxygen content data feedback of the small flue at the bottom of the regenerator;
s5: adjusting the amount of external circulating waste gas according to the air inlet amount of the regenerator;
s6: the amount of externally circulated exhaust gas is corrected in accordance with the temperature of the furnace-top space.
Referring to fig. 2, the present invention provides a coke oven heating combustion control system, the system comprising:
the furnace top space temperature feedback control module 100 is used for judging the heating height uniformity of the coke cake according to the collected raw coke oven gas temperature data above the carbonization chamber, and adjusting the opening degree of an external circulating waste gas branch pipe valve of the corresponding combustion chamber when the temperature is lower than a set threshold value so as to change the mixing amount of waste gas; the furnace top space temperature feedback control module 100 comprises a raw coke oven gas temperature acquisition module 101 and an external circulation waste gas branch pipe valve 102, wherein the raw coke oven gas temperature acquisition module 101 is used for acquiring the temperature of the raw coke oven gas above the carbonization chamber, and the external circulation waste gas branch pipe valve 102 is used for adjusting the opening degree of the external circulation waste gas branch pipe valve 102 to change the mixing amount of waste gas;
the circulating waste gas-gas feedforward control module 200 is used for starting an air quantity-external waste gas circulating quantity automatic control flow when the opening degree of the gas branch pipe valve is adjusted to exceed a set threshold value; the circulating waste gas-coal gas feedforward control module 200 comprises a single-hole coal gas flow regulating valve 201, an air inlet regulating valve 202 and the external circulating waste gas branch valve 102; the single-hole gas flow regulating valve 201 is used for regulating the opening degree of the gas branch pipe valve, the air inlet regulating valve 202 is used for regulating the content of air entering through an air inlet, the external circulation waste gas branch pipe valve 102 is used for regulating the mixing amount of waste gas, and the air inlet regulating valve 202 and the external circulation waste gas branch pipe valve 102 jointly form an automatic control flow of the air amount-external waste gas circulation amount;
the top storage suction coordination control module 300 is used for judging whether the opening of the air inlet of the waste gas tray and the opening of the regulating valve of the external circulation waste gas branch pipe reach a target opening or not according to the collected descending airflow top storage suction value and the oxygen content data; the top storage suction coordination control module 300 comprises a downdraft top storage suction acquisition module 301, an oxygen content data acquisition module 302, a waste gas disk air inlet regulating valve 303 and an external circulation waste gas regulating valve 304; the downdraft accumulation top suction force acquisition module 301 is used for acquiring a downdraft accumulation top suction force value, the oxygen content data acquisition module 302 is used for acquiring oxygen content data, the exhaust gas disc air inlet regulating valve 303 is used for regulating the opening degree of an exhaust gas disc air inlet, and the external circulation exhaust gas regulating valve 304 is used for regulating the opening degree of the external circulation exhaust gas regulating valve;
the sub-flue and storage top suction force coordination control module 400 is used for judging whether the opening degree and the overshoot number of the waste gas disc air conditioning valve reach limit values or not according to the collected descending airflow storage top suction force value and the total suction force value of the sub-flue, and starting the sub-flue suction force baffle plate to automatically adjust and realize the balanced distribution of the storage top suction force again when the opening degree and the overshoot number reach the limit values; the sub-flue and storage top suction coordination control module 400 comprises a descending airflow storage top suction acquisition module 401, a sub-flue suction data acquisition module 402, an exhaust gas disc air conditioning valve 403 and a sub-flue suction adjustment valve 404; the descending airflow top storage suction force acquisition module 401 is used for acquiring a descending airflow top storage suction force value, the sub-flue suction force data acquisition module 402 is used for acquiring a sub-flue suction force value, the waste gas disc air conditioning valve 403 is used for adjusting the opening degree of the sub-flue suction force data acquisition module, and the sub-flue suction force control valve 404 is used for starting automatic adjustment of a sub-flue suction baffle.
The method of fig. 1 and the system of fig. 2 described above are described below in conjunction with fig. 3, 4 and 7.
When the single-hole gas flow regulation exceeds a certain threshold value or the waste gas circulation amount change exceeds a certain value, the air amount regulation needs to be started so as to ensure the stability of the excess air coefficient of the single-hole combustion chamber and ensure the full combustion and no waste of fuel. The method is characterized in that the automatic regulation control precision is changed by considering the small flue gas baffle, and the method cannot be compared with the conventional manual structure control, can be started from the automatic control of the opening degree of an air inlet of an air quantity regulation source, is used as a means for controlling and regulating the top storage suction force, determines the regulation quantity by comparing the relation between the pressure of the descending airflow top storage of a combustion chamber and the air quantity of an air inlet, and ensures the overall balance of the top storage suction force by taking the top storage suction force of a hole regenerator and an adjacent regenerator and the standard top storage suction force as the reference in the regulation process.
When the opening of each air baffle reaches the set maximum value, the adjustment of the air inlet to the top storage suction force exceeds the limit value, and the adjustment is switched to the suction force adjustment of the branch flue. The scheme of regulating the air quantity by controlling the top storage suction through the opening degree of the baffle of the air inlet can reduce the overlarge manufacturing cost caused by the requirement of processing precision in the process of transforming the small flue gas baffle and easily cause the blocking phenomenon of the baffle in the regulating process, meanwhile, the air quantity is predicted by calculating and comparing the pressure difference of the ascending air flow and the descending air flow, the fine control of the quantity of the waste gas diluted combustion-supporting gas in the heating process can be improved, and the negative influence of the total air quantity which is simply regulated according to the suction force of the branch flue on the non-uniformity of the gas distribution of a single combustion chamber is reduced, so that a coke oven combustion system is in a stable and good heating state for a long time, the coking heat consumption is reduced.
As shown in fig. 7, the method of fig. 1 and the system of fig. 2 mainly include the following steps:
1. single-hole gas-circulating waste gas-air flow intelligent control:
(1) air quantity feed-forward regulation based on combustion optimization control theory
According to the combustion optimization control theory basis, the optimal surplus air coefficient of the single hole is taken as a target, when the flow rate change of the single hole coal gas or the circulation volume change of the external waste gas exceeds a threshold value, the flow rate of the single hole air and the circulation volume of the waste gas are adjusted, the proper air-coal ratio is ensured, and the combustion sufficiency and the temperature stability are ensured.
(2) Single hole air volume feedback regulation based on furnace top space temperature
The temperature of the furnace top space is obtained by an ascending pipe at the top of the carbonization chamber and is used as real-time feedback of single-hole air quantity regulation, in the heating control process of the coke oven, the temperature of the ascending pipe raw gas is also used as a judgment basis of the coke-state fire-falling time point, and in the scheme, the temperature of the raw gas is used as soft measurement data of the temperature of the furnace top space to judge the heating effect of the carbonization chamber in the height direction.
(3) Single-hole air quantity feedback adjustment based on fire drop time
And adjusting the change of the gas flow according to the single-hole fire falling time condition, and adjusting combustion-supporting gas in time in order to reduce the heat dissipation amount taken away by the redundant air amount when the gas consumption in the braising time is reduced. The air-coal ratio is adjusted in time by adjusting the amount of waste gas and the amount of air, so that the oxygen content required by gas combustion is ensured, the furnace temperature is kept, and the sensible heat brought away by redundant waste gas is reduced. When a single carbonization chamber is in the later stage of coking (after the fire drop point), the standard vertical flame path temperature of combustion chambers on two sides and the coking state of adjacent carbonization chambers are combined, the air and the circulating waste gas flow of air inlets of related combustion chambers are adjusted according to the single-tube coal gas flow control and the oxygen content calculation control algorithm required by combustion, namely, the optimal air-coal ratio of the single combustion chamber is realized, the combustion temperature is stabilized, the coal gas flow is saved and the nitrogen oxide is reduced under the condition that the coking of the adjacent carbonization chambers is not influenced.
2. Pressure balance system-based top storage suction force coordination control
After a certain carbonization chamber fires, the gas flow of the combustion chambers at two ends of the carbonization chamber is adjusted, the corresponding air intake is reduced, the adjustment of the opening of the air intake baffle and the amount of circulating exhaust gas involves the change of the suction force at the tops of the adjacent regenerators, and therefore the suction force adjustment of the target regenerator is combined with the suction force adjustment of the adjacent regenerators. And ensuring that the suction value of the top of each regenerative chamber and the deviation value of the standard top-storing suction value are in a normal range, and the pressure of the fire observation hole is in a micro-positive pressure state.
3. Coordination control of top storage suction and sub-flue suction
Based on a whole-furnace pressure balance system, according to the initialized opening of the small baffle of the flue, the top suction force of the storage and the feedback condition of the opening of the air inlet, the comprehensive adjusting mode of adjusting the target top suction force of the storage and controlling the adjacent top suction force of the storage is adopted, the condition that the regulation and control are frequent and not easy to stabilize caused by the mutual influence of the top suction forces of the heat storage chambers is avoided, the adjustment allowance of the top suction forces of the storage chambers is ensured, and the balance of the top suction forces of the heat storage chambers.
The adjustment of the top storage suction force and the total suction force of the branch flue can be mutually influenced, when the opening degree of the flue baffle reaches the maximum value, the adjustment of the air amount reaches the limit, the coordinated control of the suction force of the branch flue is needed, and the integral balance of the top storage suction force is kept while the requirement of the adjustment of the air amount of the single hole is met.
Referring to fig. 5-6, in the embodiment of the present application, the waste tray air inlet regulating valve 303 is installed at the air inlet below the waste tray air cover plate. The waste gas disc air inlet adjusting valve 303 comprises a vent 3030 connected with the bottom of an air inlet, a pneumatic actuator 3031 is arranged on a first outer side surface of the vent 3030, a positioner 3033 is arranged outside the pneumatic actuator 3031, a pneumatic duplex part 3032 is communicated between the pneumatic actuator 3031 and the positioner 3033, a plurality of louvers 30300 are arranged in the vent 3030, two ends of a connecting rod mechanism 30301 are mounted on the vent 3030 and sequentially penetrate through all the louvers 30300, a driving rod 30302 extends towards the pneumatic actuator 3031 on the louvers 30300, and the driving rod 30302 is inserted into the pneumatic actuator 3031, wherein the louvers 30300 have a first state and a second state, and when the louvers 30300 is in the first state, all the louvers 30300 do not block the vent; when in the second state, all of the louvers 30300 collectively block the vent.
The method and system are further illustrated by the following examples.
Example of the implementation
Taking a coke oven with 60 holes and 5.5m in a certain coke plant as an example, the coke oven consists of 61 combustion chambers and 62 heat storage chambers, wherein each heat storage chamber machine and a coke side waste gas disc have 124 air inlets in total, and air used for combustion is preheated in the heat storage chambers and then is introduced into a No. combustion chamber and a vertical flame path of an adjacent combustion chamber. The external exhaust gas circulation of single regenerator exhaust gas dish of present factory introduction & air intake intelligent control technique, take out waste gas from horizontal flue through the draught fan, divide to each flue gas lateral pipe by the waste gas person in charge again, 124 circulation waste gas branch pipes are through the regenerator machine, coke side waste gas dish chimney side is punched and is injected into, combustion-supporting air and the waste gas that the air intake got into fully mix the dilution in little flue and regenerator, the mixed combustion-supporting gas that oxygen content reduces, can reduce gas combustion intensity, reduce the generation of heating power type NOx, realize the environmental protection requirement of exhaust emission.
Fig. 8 and fig. 9 show the control flow of the single-tube air-circulating exhaust gas amount adjustment model half an hour before and after exchanging signals, when the gas flow of the single-tube 11# combustion chamber changes, because each air inlet needs to supply the air amount of the flame path of the combustion chamber and the adjacent combustion chamber, and the adjustment of the air amount directly influences the top pressure (number 10-12) balance of the relevant regenerator. Therefore, when the air intake or the single-hole exhaust gas circulation is adjusted, in order to ensure that the suction force at the tops of the adjacent regenerators is within the normal deviation range and the overall top-storage suction force of the coke oven is balanced, the condition that the suction force at the top of the No. 11 heat storage meets the standard top-storage suction force range is taken as the criterion. When the air quantity of No. 11 is adjusted to exceed the threshold value, the opening degrees of the small flue baffles at the regenerators of No. 10 and No. 12 are correspondingly and automatically adjusted, and meanwhile, in order to eliminate the influence of the operation of the small flue baffles of No. 10 and No. 12 on the air intake of No. 9 and No. 13, the opening degrees of the air intake doors of the regenerators of No. 9 and No. 13 are finely adjusted by combining the temperatures of the vertical flame paths of the combustors of No. 9 and No. 13. In the process of the hardware reconstruction of the practical scheme, because the smoke small baffle valve is easy to block in the flue, the automatic reconstruction number of the double-regenerator actuators is twice the number of the air inlet reconstruction points, and because the requirement on processing precision is higher, the automatic actuators control the reconstruction cost and the regulation difficulty and the like.
30min before signal exchange, an air port of a waste gas disc of the No. 11 regenerator is opened to supply air for a double-number flame path of the No. 11 combustion chamber and a single-number flame path of the No. 10 combustion chamber. When the fire of No. 11 carbonization chamber falls, the gas quantity of No. 11 and No. 12 combustion chambers is reduced by half, in order to ensure that the excess coefficients of the two combustion chambers are not changed, the air entering the double-number flame path of No. 11 combustion chamber and the single-number flame path of No. 12 combustion chamber is adjusted, the air inlet opening of No. 11 regenerator is reduced according to the relation between the gas flow and the pressure difference according to the supply principle of the regenerator air according to the 'double-front single', and in the adjusting process, the suction change of the tops of the two adjacent regenerators 10 and 12 does not exceed the standard top suction change range, so that the phenomena of fire falling, smoke emission and the like of the corresponding combustion chamber flame path can be ensured. When the change value of the No. 11 top-storage suction force is not obvious and the opening degree of the valve exceeds the set range, the opening degree of the sub-flue suction baffle is comprehensively considered to ensure the suction distribution of the top of the whole regenerator, so that the No. 11 top-storage suction force is within the normal allowable range value under the process condition.
30min after the exchange, the air cover plate of the No. 11 regenerator is closed, the downdraft is discharged from the small flue through the regenerator, the downdraft smoke is composed of combustion waste gas of the No. 10 and No. 11 combustion chambers, and is determined by the air intake controlled by the air cover plates of the No. 10 and No. 12 regenerators.
The turnover plate of the waste gas small flue of the heat storage chamber No. 11 is opened, the descending airflow of the double-number vertical flame path of the combustion chamber and the single-number vertical flame path of the combustion chamber No. 10 flows out, the air of the combustion chamber No. 11 is supplied by the air port of the heat storage chamber No. 12 and the air of the combustion chamber No. 10 is supplied by the air inlet of the heat storage chamber No. 10, when the supply of the gas of the combustion chamber No. 10 and the gas of the combustion chamber No. 11 is reduced, the air quantity from the air inlet of the heat storage chamber No. 12 and the air inlet of the heat storage chamber No. 10 is properly. Comparing the deviation of the No. 11 capping suction force with the standard capping suction force ensures that it is within the normal allowable value range for the process case. When the air quantity of the vertical flue of the No. 10 and No. 11 combustion chambers is adjusted and reduced, the influence on the air quantity of the vertical flue of the No. 9 and No. 12 combustion chambers is reduced by referring to the variation range of the downdraft stored-top suction force of the No. 9 and No. 13 regenerative chambers.
And simultaneously, when the change of the single top storage suction force exceeds a deviation set value, the opening of an air inlet of the single heat storage chamber exhaust gas disc is started to be adjusted, the integral balance of the top storage suction force is ensured, the standard oxygen content data of the heat storage chamber is used as the matching control basis of the air quantity of the air inlet of each exhaust gas disc and the exhaust gas quantity of the circulating exhaust gas branch pipe, and the temperature change of the furnace top space of the single-hole carbonization chamber is used as the feedback correction reference of the adjustment of the air inlet.
Compared with the prior art, the invention has the advantages that:
(1) the optimized air inlet flow control structure is improved, the damage to the original coke oven structure is reduced to the maximum extent, and the automatic adjustment of the air quantity in the combustion process is realized.
(2) The air quantity and the circulating waste gas quantity are controlled through the change of the coal gas quantity and the change of the heat load requirement, reasonable air-coal ratio distribution can be realized, the sensible heat of waste gas brought away by redundant air is reduced, and the coal gas quantity is saved.
(3) The accurate control waste gas mixing volume reduces the gaseous oxygen concentration of mixing, reduces the high-temperature concentration district of flame, obviously improves the vertical flue height and to the heating homogeneity, improves the coke quality.
(4) The influence of the mixing of the circulating waste gas on the fluctuation of the suction force of a single storage top is reduced, and the uniformity of the suction force of the storage top is obviously improved.
(5) The manual air and waste gas opening regulation is avoided, the labor intensity of fire regulators is greatly reduced, and the hysteresis and the measurement error caused by manual regulation are reduced.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (1)
1. A coke oven heating combustion control system, the system comprising:
the furnace top space temperature feedback control module is used for judging the heating height uniformity of the coke cake according to the collected raw coke oven gas temperature data, and adjusting the opening degree of an external circulating waste gas branch pipe valve of the corresponding combustion chamber to change the mixing amount of waste gas when the temperature is lower than a set threshold value; the furnace top space temperature feedback control module comprises a raw gas temperature acquisition module at an ascending pipe and an external circulation waste gas branch pipe valve, the raw gas temperature acquisition module is used for acquiring the temperature of the raw gas, and the external circulation waste gas branch pipe valve is used for adjusting the opening degree of the external circulation waste gas branch pipe valve to change the mixing amount of waste gas;
the circulating waste gas-gas feedforward control module is used for starting an air quantity-external waste gas circulating quantity automatic control flow when the opening degree of the gas branch pipe valve is adjusted to exceed a set threshold value; the circulating waste gas-coal gas feedforward control module comprises a single-hole coal gas flow regulating valve, an air inlet regulating valve and the external circulating waste gas branch valve; the single-hole gas flow regulating valve is used for regulating the opening degree of the gas branch pipe valve, the air inlet regulating valve is used for regulating the content of air entering through the air inlet, the external circulation waste gas branch pipe valve is used for regulating the mixing amount of waste gas, and the air inlet regulating valve and the external circulation waste gas branch pipe valve jointly form the automatic air amount-external waste gas circulation amount control flow;
the top storage suction coordination control module is used for judging whether the opening of an air inlet of the waste gas tray and the opening of an adjusting valve of an external circulation waste gas branch pipe reach a target opening or not according to the collected descending airflow top storage suction value and oxygen content data; the top storage suction coordination control module comprises a downdraft top storage suction acquisition module, an oxygen content data acquisition module, a waste gas disc air inlet regulating valve and an external circulation waste gas regulating valve; the downdraft top-storage suction collecting module is used for collecting downdraft top-storage suction values, the oxygen content data collecting module is used for collecting oxygen content data at the bottom of the heat storage chamber, the waste gas disc air inlet adjusting valve is used for adjusting the opening degree of a waste gas disc air inlet, and the external circulation waste gas adjusting valve is used for adjusting the opening degree of an external circulation waste gas branch pipe;
the sub-flue and storage top suction force coordination control module is used for judging whether the opening degree and the overshoot number of the waste gas disc air conditioning valve reach limit values or not according to the collected descending airflow storage top suction force value and the collected sub-flue total suction force value, and starting a sub-flue suction force baffle plate to automatically adjust and realize the balanced distribution of storage top suction force again when the opening degree and the overshoot number reach the limit values; the sub-flue and storage top suction coordination control module comprises a descending airflow storage top suction acquisition module, a sub-flue suction data acquisition module, a waste gas disc air conditioning valve and a sub-flue suction adjustment valve; the descending airflow top storage suction collecting module is used for collecting a descending airflow top storage suction value, the sub-flue suction data collecting module is used for collecting a sub-flue suction value, the waste gas disc air conditioning valve is used for adjusting the opening degree of the sub-flue suction data collecting module, and the sub-flue suction regulating valve is used for starting a sub-flue suction baffle to automatically adjust;
the waste gas disc air inlet adjusting valve is arranged at an air inlet below the waste gas disc air cover plate; the waste gas disc air inlet adjusting valve comprises a vent connected with the bottom of an air inlet, a pneumatic actuator is arranged on the first outer side surface of the vent, a positioner is arranged outside the pneumatic actuator, a pneumatic linkage is communicated between the pneumatic actuator and the positioner, a plurality of louver boards are arranged in the vent, two ends of a connecting rod mechanism are arranged on the vent and sequentially penetrate through all the louver boards, a driving rod is arranged on each louver board in an extending mode towards the pneumatic actuator, the driving rod is inserted into the pneumatic actuator, the louver boards have a first state and a second state, and when the louver boards are in the first state, all the louver boards do not block the vent; when in the second state, all of the louvres collectively close the vent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910829111.6A CN110511768B (en) | 2019-09-03 | 2019-09-03 | Coke oven heating combustion control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910829111.6A CN110511768B (en) | 2019-09-03 | 2019-09-03 | Coke oven heating combustion control method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110511768A CN110511768A (en) | 2019-11-29 |
| CN110511768B true CN110511768B (en) | 2021-03-19 |
Family
ID=68630683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910829111.6A Active CN110511768B (en) | 2019-09-03 | 2019-09-03 | Coke oven heating combustion control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110511768B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112480951B (en) * | 2020-07-09 | 2022-03-11 | 大连市昊通环保工程技术有限公司 | Method for adjusting unsteady-state low-NOx coke oven heating gas feed-forward adjustment coke oven |
| CN112524965A (en) * | 2020-12-03 | 2021-03-19 | 张家港宏昌钢板有限公司 | Coke oven flue capable of adjusting airflow and adjusting method |
| CN115074141B (en) * | 2022-06-17 | 2023-07-14 | 鞍山华泰环能工程技术有限公司 | Method and device for controlling combustion degree of heat recovery coke oven and coke oven system |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035850A (en) * | 1983-08-09 | 1985-02-23 | Nippon Kokan Kk <Nkk> | Method for processing temperature information of combustion furnace |
| JP2933788B2 (en) * | 1992-12-04 | 1999-08-16 | 新日本製鐵株式会社 | Coke oven carbon removal method |
| JP3285259B2 (en) * | 1993-10-13 | 2002-05-27 | 新日鐵化学株式会社 | Coke production method |
| CN1266251C (en) * | 2003-12-26 | 2006-07-26 | 中国科学院自动化研究所 | Automatic heating method for coke oven coking production |
| CN1952481A (en) * | 2005-10-18 | 2007-04-25 | 中南大学 | Intelligent decoupling control method by pressurizing with mixed coal gas |
| CN101372622B (en) * | 2007-08-20 | 2011-12-28 | 尚文彬 | Automation control method for coke oven heating |
| CN101486917B (en) * | 2009-02-24 | 2013-03-20 | 武汉钢铁(集团)公司 | Coke oven alpha value on-line detecting system and coke oven heating system regulating method |
| KR101406567B1 (en) * | 2011-12-09 | 2014-06-13 | 재단법인 포항산업과학연구원 | Method for reducing NOx by flue gas recirculation |
| CN103593578A (en) * | 2013-11-27 | 2014-02-19 | 中南大学 | Flue suction force feedback setting method in coke oven heating combustion process |
| CN207397131U (en) * | 2017-09-28 | 2018-05-22 | 湖南千盟智能信息技术有限公司 | A kind of coke oven heating intelligence control system |
| CN108949193B (en) * | 2018-07-31 | 2021-02-09 | 中冶焦耐(大连)工程技术有限公司 | Coke oven waste gas circulation volume automatic control system and method |
| CN108728127B (en) * | 2018-07-31 | 2023-08-25 | 中冶焦耐(大连)工程技术有限公司 | Low-nitrogen-emission coke oven heating system adopting rich gas heating and adjusting method thereof |
| CN108728126B (en) * | 2018-07-31 | 2024-01-30 | 中冶焦耐(大连)工程技术有限公司 | High-directional heating uniformity at any time adjustable coke oven heating system and adjusting method |
-
2019
- 2019-09-03 CN CN201910829111.6A patent/CN110511768B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110511768A (en) | 2019-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110511768B (en) | Coke oven heating combustion control method and system | |
| CN109084324B (en) | The burning air quantity control system and control method of biomass boiler | |
| US5626085A (en) | Control of staged combustion, low NOx firing systems with single or multiple levels of overfire air | |
| CN108800191B (en) | A kind of Dynamic Optimum method of tangential firing boiler Secondary Air air distribution | |
| CN112628712A (en) | Secondary air closed-loop optimization control system based on air door resistance coefficient | |
| CN106190184A (en) | A kind of coke oven heating method and device reducing NOx generation | |
| CN111306572A (en) | Intelligent combustion optimizing energy-saving control system for boiler | |
| CN101050864B (en) | Control method for low temperature corrosion blocking ash of coal burning boiler air preheater | |
| CN208382139U (en) | A kind of flue gas recirculation system of low nitrogen burning | |
| CN103672950B (en) | The firing optimization method of the W type flame furnace that the lower Secondary Air tilt angled down of arch is adjustable | |
| CN111123704A (en) | Energy-saving prediction control method for reheating steam temperature of secondary reheating unit | |
| CN206958896U (en) | A kind of decoupling combustion device | |
| CN105180205A (en) | Control method for oxygen-enriched combustion smoke circulation system | |
| CN204254603U (en) | CFBB low nitrogen burning system | |
| CN208649221U (en) | It is a kind of high to heating uniformity adjustable coke oven heating system at any time | |
| CN106224948A (en) | A kind of self adaptation CFBB control method | |
| CN107166428B (en) | Layer combustion boiler flue gas oxygen content control system based on flue gas recirculation | |
| CN113341713B (en) | Coal-air synchronous dynamic coordination control method for coal-fired unit | |
| CN115183570A (en) | Mineral powder vertical mill system and automatic control method | |
| CN105135471A (en) | Switching control device and method for operation mode of oxygen-enriched combustion system | |
| CN110006034B (en) | Optimized air distribution method for reducing NOx emission and slag coking of W-shaped flame furnace | |
| CN113983489A (en) | Secondary air distribution method for active corrosion prevention of opposed firing boiler | |
| CN207279689U (en) | A kind of grate firing boiler flue gas oxygen content control system based on flue gas recirculation | |
| CN208649219U (en) | The variable rich gas of heated height heats coke oven heating system | |
| CN202849334U (en) | System for regulating smoke temperature of water-coal-slurry-fired cracking furnace by recirculation of excess air and smoke gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221222 Address after: No.28 Kangwang Industrial Park, Yueyang Economic and Technological Development Zone, Yueyang City, Hunan Province, 414000 Patentee after: HUNAN QIANMENG INDUSTRIAL INTELLIGENT SYSTEM Co.,Ltd. Address before: Room 507, accelerator workshop, building B-3, 627 Lugu Avenue, Yuelu District, Changsha City, Hunan Province, 410205 Patentee before: HUNAN CHAIRMAN INTELLIGENT INFORMATION TECHNOLOGY CO.,LTD. |