CN117215272A - Intelligent dual-fuel switching control system and method for crude tin smelting furnace - Google Patents
Intelligent dual-fuel switching control system and method for crude tin smelting furnace Download PDFInfo
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- CN117215272A CN117215272A CN202311364419.0A CN202311364419A CN117215272A CN 117215272 A CN117215272 A CN 117215272A CN 202311364419 A CN202311364419 A CN 202311364419A CN 117215272 A CN117215272 A CN 117215272A
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- 239000000446 fuel Substances 0.000 title claims abstract description 138
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000003723 Smelting Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 214
- 230000001105 regulatory effect Effects 0.000 claims description 165
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 146
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 128
- 239000001301 oxygen Substances 0.000 claims description 128
- 229910052760 oxygen Inorganic materials 0.000 claims description 128
- 239000003345 natural gas Substances 0.000 claims description 107
- 229910052757 nitrogen Inorganic materials 0.000 claims description 73
- 239000007789 gas Substances 0.000 claims description 52
- 239000003245 coal Substances 0.000 claims description 35
- 238000009423 ventilation Methods 0.000 claims description 33
- 238000010926 purge Methods 0.000 claims description 30
- 239000002893 slag Substances 0.000 claims description 30
- 238000002360 preparation method Methods 0.000 claims description 24
- 239000007921 spray Substances 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 230000004069 differentiation Effects 0.000 claims description 5
- 230000010354 integration Effects 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002802 bituminous coal Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/33—Director till display
- G05B2219/33273—DCS distributed, decentralised controlsystem, multiprocessor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses an intelligent dual-fuel switching control system and method for a crude tin smelting furnace, and relates to the technical field of crude tin smelting. The intelligent dual-fuel switching system performs intelligent selection through actual fuel parameters, and selects corresponding configuration parameters according to fuel media so as to ensure the temperature of the crude tin smelting furnace. The invention solves the problem of single traditional fuel of the crude tin smelting furnace, solves the manual intervention from control, ensures the safety and stability of the crude tin smelting furnace, and provides a more flexible and reliable intelligent control system for the production of the crude tin smelting process.
Description
Technical Field
The invention relates to the technical field of crude tin smelting, in particular to an intelligent dual-fuel switching control system and method for a crude tin smelting furnace.
Background
Along with the rapid development of crude tin smelting technology, the production scale is increasingly enlarged, the process flow is more and more complex, and the requirements on the production cost, the technology and the intelligent control of crude tin smelting are higher and higher. In the traditional crude tin smelting process, the fuel used in the smelting furnace is bituminous coal. The pulverized coal single fuel is used, so that on one hand, a large amount of dust is generated in the process of processing and transporting the pulverized coal, and the environmental protection treatment difficulty is increased; on the other hand, the pulverized coal generates a large amount of CO gas in the combustion process, and has a certain influence on environmental protection. In addition, the processing and transportation of the pulverized coal consume a great deal of cost, and the purposes of energy conservation and consumption reduction are not achieved, so that the long-term development of companies is not facilitated. Meanwhile, dust generated after the bituminous coal is combusted brings a certain influence on the smelting furnace and treatment difficulty. Furthermore, coal is neither a renewable resource nor a clean energy source, has its limitations in storage, and cannot be used as a long-term fuel for crude tin smelting.
Based on the above situation, research and study on dual-fuel intelligent control is needed, and an optimized switching scheme is hoped to not only greatly improve the environmental protection quality, reduce personnel intervention and improve the production efficiency, but also realize the fuel bidirectional selective control.
Therefore, how to realize the dual fuel function and control of crude tin smelting, reduce the production cost and improve the production efficiency is a problem which needs to be solved by the technicians in the field.
Disclosure of Invention
In view of the above, the invention provides an intelligent dual-fuel switching control system and method for a crude tin smelting furnace, which solve the problems of the traditional crude tin smelting single-fuel control system, solve the fuel singleness and save the running cost of a company to the maximum extent.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an intelligent dual-fuel switching control system of a crude tin smelting furnace comprises a DCS management layer, a DCS control layer and a field device layer;
the DCS management layer comprises a DCS engineer station and a DCS configuration server;
the DCS control layer comprises a DCS controller, a data acquisition module and an output data module; the DCS controller is connected with the data acquisition module and the data output module through an EBUS bus for data interaction; the DCS controller is connected and communicated with the DCS configuration server and the DCS engineer station through the exchanger; the DCS controller and the exchanger interact data through LBUS bus, and the exchanger interacts data with the DCS configuration server and the DCS engineer station through industrial Ethernet;
the field device layer comprises a fuel one device layer and a fuel two device layer; the data acquisition module is connected and communicated with the first fuel equipment layer and the second fuel equipment layer, acquires equipment layer data and transmits the equipment layer data to the DCS controller; the DCS controller generates control instructions according to the furnace body operation mode and the equipment layer data and transmits the control instructions to the output data module, the output data module is connected and communicated with the first fuel equipment layer and the second fuel equipment layer, and the first fuel equipment layer or the second fuel equipment layer is controlled according to the control instructions.
The technical effect of the technical scheme is that the data acquisition module acquires equipment layer data and transmits the equipment layer data to the DCS controller, the DCS controller is connected with the switch through the LBUS bus, the switch is connected with the DCS engineer station and the DCS configuration server through the industrial Ethernet, and the data of the DCS controller are sequentially transmitted to the DCS configuration server through the switch and the industrial Ethernet for data display and real-time monitoring; the DCS engineer station is connected with the DCS controller for communication, and a control program is burnt into the DCS controller.
Preferably, the fuel-plant layer comprises an oxygen pressure detector A, an oxygen shut-off valve, an oxygen flow detector A, an oxygen regulating valve A, a natural gas pressure detector, a natural gas shut-off valve, a natural gas flow detector, a natural gas regulating valve, an oxygen purge valve, a natural gas purge valve, a nitrogen pressure detector, a nitrogen shut-off valve, a nitrogen flow detector, a nitrogen regulating valve, a overgrate air pressure detector A, a overgrate air flow detector A, a overgrate air regulating valve A and a spray gun; the oxygen pressure detector A, the oxygen shut-off valve, the oxygen flow detector A and the oxygen regulating valve A are connected in sequence; the natural gas pressure detector, the natural gas cut-off valve, the natural gas flow detector and the natural gas regulating valve are connected in sequence; the nitrogen pressure detector, the nitrogen shut-off valve, the nitrogen flow detector and the nitrogen regulating valve are connected in sequence; the secondary air pressure detector A, the secondary air flow detector A and the secondary air regulating valve A are sequentially connected; the outlet end of the oxygen regulating valve A is respectively connected with the outlet end of the oxygen purging valve and the spray gun, the inlet end of the oxygen purging valve is connected with the inlet end of the nitrogen pressure detector and the inlet end of the natural gas purging valve, and the outlet end of the natural gas purging valve, the outlet end of the natural gas regulating valve, the outlet end of the nitrogen regulating valve and the outlet end of the overgrate air regulating valve A are all connected with the spray gun; the oxygen pressure detector A, the oxygen flow detector A, the natural gas pressure detector, the natural gas flow detector, the nitrogen pressure detector, the nitrogen flow detector, the overgrate air pressure detector A and the overgrate air flow detector A are all electrically connected with the data acquisition module; the oxygen shut-off valve, the oxygen regulating valve A, the natural gas shut-off valve, the natural gas regulating valve, the oxygen purging valve, the natural gas purging valve, the nitrogen shut-off valve, the nitrogen regulating valve and the secondary air regulating valve A are all electrically connected with the output data module; the spray gun is inserted through an opening on the furnace body and is arranged in the furnace body.
Preferably, the fuel two-equipment layer comprises a primary air pressure detector, a primary air flow detector, a primary air regulating valve, a pulverized coal bin, a pulverized coal feeder, a secondary air pressure detector B, a secondary air flow detector B, a secondary air regulating valve B, an oxygen pressure detector B, an oxygen flow detector B and an oxygen regulating valve B; the primary air pressure detector, the primary air flow detector and the primary air regulating valve are connected in sequence; the secondary air pressure detector B, the secondary air flow detector B and the secondary air regulating valve B are sequentially connected; the oxygen pressure detector B, the oxygen flow detector B and the oxygen regulating valve B are sequentially connected; the outlet end of the primary air regulating valve is connected to a connecting pipeline of the outlet end of the pulverized coal bin and the inlet end of the pulverized coal feeder, and the outlet end of the pulverized coal feeder, the outlet end of the secondary air regulating valve B and the outlet end of the oxygen regulating valve B are all connected to the furnace body; the primary air pressure detector, the primary air flow detector, the pulverized coal feeder, the secondary air pressure detector B, the secondary air flow detector B, the oxygen pressure detector B and the oxygen flow detector B are all electrically connected with the data acquisition module; the primary air regulating valve, the pulverized coal feeder, the secondary air regulating valve B and the oxygen regulating valve B are all electrically connected with the output data module.
Preferably, the first fuel filled in the first fuel equipment layer is natural gas, and the second fuel filled in the second fuel equipment layer is pulverized coal; judging the supply condition of the first fuel through the natural gas pressure value detected by a natural gas pressure detector in the first fuel equipment layer, and performing automatic fuel switching control by the DCS controller according to the supply condition of the first fuel; the system preferably uses the first fuel device layer to supply power when the first fuel supply is sufficient, and switches to use the second fuel device layer to supply power when the first fuel supply is insufficient.
Preferably, the natural gas pressure value is compared with the set minimum natural gas pressure value, if the natural gas pressure value is greater than or equal to the minimum natural gas pressure value, the supply condition is that the fuel is sufficient for supplying, the operation of the fuel-plant layer is switched to, otherwise, the supply condition is that the fuel is insufficient for supplying, and the operation of the fuel-plant layer is switched to.
Preferably, the furnace body operation modes comprise a preparation mode, a converting mode and a furnace body slag discharge mode, different valve openings are preset for different regulating valves and cut-off valves or the valves are controlled to be opened at the initial moment of switching modes in the DCS controller, and when the furnace body operation modes are automatically switched in the working modes of different equipment layers, corresponding valves of different equipment layers are switched to the preset valve openings or opened, so that slag is prevented from blocking a spray gun when the furnace body operation modes are switched into coal fuel.
Preferably, when the fuel-plant layer works, switching to a preparation mode, presetting valve opening for a nitrogen regulating valve and a secondary air regulating valve A, ensuring a certain valve opening value, preventing pipeline blockage, setting corresponding gas fixed values for nitrogen ventilation and secondary air ventilation, and adjusting the opening of the corresponding regulating valve by a PID (proportion integration differentiation) controller in the DCS controller according to the gas fixed values and plant layer data;
the preparation mode is switched to a converting mode, the opening of a nitrogen regulating valve, a secondary air regulating valve A, an oxygen regulating valve A and a natural gas regulating valve are preset, the reasonable proportion of initial combustion parameters is ensured, meanwhile, sufficient solvent stirring pressure is provided for the interior of the furnace, corresponding gas set values are calculated according to the secondary air ventilation volume and the oxygen ventilation volume according to equipment layer data through an algorithm deployed in a DCS controller, corresponding gas fixed values are set for the nitrogen ventilation volume and the natural gas ventilation volume, and the PID controller adjusts the opening of the corresponding regulating valve according to the gas fixed values, the equipment layer data and the gas set values;
and in the slag discharging mode, the opening of the valves is preset for the nitrogen regulating valve, the secondary air regulating valve A, the oxygen regulating valve A and the natural gas regulating valve, so that normal heat supply is kept.
Preferably, when the fuel two equipment layers work, the DSC controller controls the primary air regulating valve, the secondary air regulating valve B and the oxygen regulating valve B to be opened in a preparation mode, and corresponding gas fixed values are set for the primary air ventilation amount and the secondary air ventilation amount;
setting corresponding gas fixed values for the primary air ventilation volume, the secondary air ventilation volume and the oxygen ventilation volume in a converting mode and a slag discharging mode, and adjusting the opening of corresponding valves and/or the rotating speed of the pulverized coal feeder according to the preset gas fixed values;
the equipment layer data comprises a natural gas pressure value, a natural gas flow value, an oxygen pressure value, an oxygen flow value, a nitrogen pressure value, a nitrogen flow value, a secondary air pressure value, a secondary air flow value, a primary air pressure value, a primary air flow value and a pulverized coal feeder rotating speed.
Preferably, when the fuel-plant layer works, the gas set values comprise an oxygen flow set value, a secondary air flow set value and a natural gas flow set value; the oxygen flow set value is calculated according to the oxygen-fuel ratio, the excess coefficient, the natural gas flow value and the secondary air flow value; the secondary air flow set value is calculated according to the nitrogen flow value and the mixed gas set value; setting an empirical value of the natural gas flow set value according to the running mode in the furnace;
the calculation formulas of the oxygen flow set value SV1 and the secondary air flow set value SV2 are as follows:
SV1＝K1*K*FT1-FT2*0.21
SV2＝SV-FT3
wherein SV1 is the oxygen flow set value; k1 is the oxygen combustion ratio; k is an excess coefficient; FT1 is the natural gas flow value; FT2 is the secondary air flow value detected by the secondary air flow detector A; SV2 is the secondary air flow set value; SV is the set value of the mixed gas, and FT3 is the flow value of nitrogen.
Preferably, the oxygen pressure value, the nitrogen pressure value, the secondary air pressure value and the primary air pressure value are checked to judge whether the air pressure in the furnace body is stable.
Preferably, the intelligent dual-fuel switching control system of the crude tin smelting furnace is further provided with an operator station and an OPC server, wherein the operator station and the OPC server are connected with the switch through the Ethernet, the operator station is used for data monitoring, and the OPC server is used for uploading data to other systems.
An intelligent dual-fuel switching control method for a crude tin smelting furnace comprises the following steps:
step 1: collecting a natural gas pressure value, and judging whether the natural gas pressure value is larger than a switching threshold value or not;
step 2: if the switching threshold value is larger than the switching threshold value, starting a fuel-equipment layer to supply fuel I, entering a preparation mode in a furnace body operation mode, and entering a step 3; otherwise, starting the fuel two equipment layer to supply fuel two, entering a preparation mode in the furnace body operation mode, and entering a step 7;
step 3: opening an oxygen purging valve, a natural gas purging valve and a nitrogen shut-off valve in a fuel-equipment layer, opening a nitrogen regulating valve and a secondary air regulating valve A to preset valve opening, and entering a converting mode in a furnace body operation mode;
step 4: collecting equipment layer data in a fuel-equipment layer, judging whether any data of a natural gas flow value, an oxygen flow value, a secondary air flow value, a natural gas pressure value and an oxygen pressure value is smaller than a minimum set value, and if both the data are larger than the minimum set value, entering a step 5; otherwise, entering a preparation mode and returning to the step 3;
step 5: closing an oxygen purging valve and a natural gas purging valve in a fuel-plant layer, opening an oxygen cutting valve and a natural gas cutting valve, opening an oxygen regulating valve A, a natural gas regulating valve, a nitrogen regulating valve and a secondary air regulating valve A to preset valve opening degrees, calculating a gas set value according to plant layer data, comparing the gas set value with the plant layer data according to the gas set value, and respectively regulating the opening degrees of the oxygen regulating valve A, the natural gas regulating valve, the nitrogen regulating valve and the secondary air regulating valve A through a PID (proportion integration differentiation) controller in a DCS (distributed control system) controller according to a comparison result and a preset gas set value; the opening of the secondary air regulating valve A is used for controlling the air flow to reach a secondary air flow set value;
step 6: judging the slag condition, if the tin content is lower than a set tin value, entering a furnace body in a furnace body operation mode to discharge slag, and ending blowing when the slag discharge is ended; otherwise, continuing the converting mode and returning to the step 5;
step 7: starting a primary air regulating valve, a secondary air regulating valve B and an oxygen regulating valve B in a fuel two-equipment layer, starting a pulverized coal feeder, and entering a converting mode in a furnace body operation mode;
step 8: collecting equipment layer data in the two fuel equipment layers, judging whether any data of a primary air flow value, an oxygen flow value and a secondary air flow value is smaller than a minimum set value, and if so, entering a step 9; otherwise, entering a preparation mode and returning to the step 7;
step 9: PID control of the primary air regulating valve, the secondary air regulating valve B and the oxygen regulating valve B is carried out according to a preset gas fixed value; judging the slag condition, if the tin content is lower than a set tin value, entering a furnace body in a furnace body operation mode to discharge slag, and ending blowing when the slag discharge is ended; otherwise, continuing the converting mode and returning to the step 8.
Compared with the prior art, the intelligent dual-fuel switching control system and method for the crude tin smelting furnace provided by the invention can judge the supply condition of the first fuel from the pressure value of the first fuel, and preferentially select the first fuel as the fuel of the crude tin smelting furnace under the condition of sufficient supply of the first fuel, and selectively control the opening and closing of the shut-off valve and the opening of the regulating valve through the operation mode of the furnace body. Under the condition of insufficient supply of the first fuel, the second fuel is selected as the fuel of the crude tin smelting furnace, and different setting parameters are selected for valve control according to the running condition of the furnace body. The whole system realizes intelligent switching control of dual fuels, corresponding configuration parameters are selected according to fuel media, so that the temperature of the crude tin smelting furnace is ensured, the problem of single traditional fuel of the crude tin smelting furnace is solved, manual intervention is solved from control, the production efficiency is improved, the safety and stability of the crude tin smelting furnace are ensured, and a more flexible and reliable intelligent control system is provided for production of the crude tin smelting process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an intelligent dual-fuel switching control system and method for a crude tin smelting furnace provided by the embodiment of the invention;
FIG. 2 is a block diagram of a fuel-plant in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of a fuel two-plant provided by the present invention;
fig. 4 is a program logic control diagram of an intelligent dual-fuel switching control method of a crude tin smelting furnace.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses an intelligent dual-fuel switching control system of a crude tin smelting furnace, which is shown in figure 1 and comprises a DCS management layer, a DCS control layer and a field device layer; the DCS management layer comprises a DCS engineer station and a DCS configuration server; the DCS management layer writes a production process control program into a controller of the DCS control layer through a DCS engineer station and a DCS configuration server, and monitors and controls data of the DCS control layer in real time; the DCS control layer comprises a controller and a data acquisition module. The DCS controller and the data acquisition module are connected through an EBUS bus to perform data interaction; the data of the DCS control layer is transmitted to the DCS system management layer through the switch to carry out data display and real-time monitoring; the DCS controller and the exchanger interact data through LBUS bus, and the exchanger interacts data with the DCS configuration server and the DCS engineer station through industrial Ethernet.
The field device layers include a fuel one device layer and a fuel two device layer, as shown in fig. 2 and 3, respectively.
The fuel-plant layer comprises an oxygen pressure detector A1, an oxygen cut-off valve 2, an oxygen flow detector A3, an oxygen regulating valve A4, a natural gas pressure detector 5, a natural gas cut-off valve 6, a natural gas flow detector 8, a natural gas regulating valve 9, an oxygen purging valve 7, a natural gas purging valve 10, a nitrogen pressure detector 11, a nitrogen cut-off valve 12, a nitrogen flow detector 13, a nitrogen regulating valve 14, a secondary air pressure detector A15, a secondary air flow detector A16, a secondary air regulating valve A17 and a spray gun 18; the fuel two equipment layers comprise a primary air pressure detector 19, a primary air flow detector 20, a primary air regulating valve 21, a pulverized coal bin 22, a pulverized coal feeder 26, a secondary air flow detector B23, a secondary air flow detector B24, a secondary air regulating valve B25, an oxygen pressure detector B27, an oxygen flow detector B28 and an oxygen regulating valve B29; the lance 18 is inserted through an opening in the furnace body and is installed in the furnace body.
Further, the first fuel filled in the first fuel equipment layer is natural gas, and the second fuel filled in the second fuel equipment layer is pulverized coal. The supply condition of the first fuel is judged by the natural gas pressure value acquired by the natural gas pressure detector 5 in the first fuel equipment layer, the first fuel is preferentially selected by the system under the condition of sufficient supply of the first fuel, and the second fuel is automatically switched by the system under the condition of insufficient supply of the first fuel. And comparing the natural gas pressure value with the set minimum natural gas pressure value, if the natural gas pressure value is greater than or equal to the minimum natural gas pressure value, switching to the first fuel equipment layer operation if the supply condition is that the first fuel is sufficiently supplied, and otherwise switching to the second fuel equipment layer operation if the supply condition is that the first fuel is insufficiently supplied.
Further, the furnace body operation modes comprise a preparation mode, a converting mode and furnace body slag discharge. Different valve openings are preset for different regulating valves and cut-off valves at the initial moment of a switching mode in a DCS controller aiming at different modes, or the valves are controlled to be opened, when the furnace body operation modes are automatically switched in different equipment layer working modes, corresponding valves of different equipment layers are switched to the preset valve openings or opened, and slag is prevented from blocking a spray gun when the switching is performed to coal fuel.
Further, when the fuel-plant layer works, switching to a preparation mode, presetting valve opening for the nitrogen regulating valve and the secondary air regulating valve A, ensuring a certain valve opening value, preventing pipeline blockage, setting corresponding gas fixed values for the nitrogen ventilation and the secondary air ventilation, and adjusting the opening of the corresponding regulating valve by a PID (proportion integration differentiation) controller in the DCS controller according to the gas fixed values and plant layer data; the preparation mode is switched to a converting mode, the opening of a nitrogen regulating valve, a secondary air regulating valve A, an oxygen regulating valve A and a natural gas regulating valve are preset, the reasonable proportion of initial combustion parameters is ensured, meanwhile, sufficient solvent stirring pressure is provided for the interior of the furnace, corresponding gas set values are calculated according to the secondary air ventilation volume and the oxygen ventilation volume according to equipment layer data through an algorithm deployed in a DCS controller, corresponding gas fixed values are set for the nitrogen ventilation volume and the natural gas ventilation volume, and the PID controller adjusts the opening of the corresponding regulating valve according to the gas fixed values, the equipment layer data and the gas set values; and in the slag discharging mode, the opening of the valves is preset for the nitrogen regulating valve, the secondary air regulating valve A, the oxygen regulating valve A and the natural gas regulating valve, so that normal heat supply is kept.
Further, when the fuel two equipment layers work, the DSC controller controls the primary air regulating valve, the secondary air regulating valve B and the oxygen regulating valve B to be opened in a preparation mode, and corresponding gas fixed values are set for the primary air ventilation amount and the secondary air ventilation amount; and in the converting mode and the deslagging mode, setting corresponding gas fixed values for the primary air ventilation volume, the secondary air ventilation volume and the oxygen ventilation volume, and adjusting the opening of corresponding valves and/or the rotating speed of the pulverized coal feeder according to the preset gas fixed values. The equipment layer data comprises a natural gas pressure value, a natural gas flow value, an oxygen pressure value, an oxygen flow value, a nitrogen pressure value, a nitrogen flow value, a secondary air pressure value, a secondary air flow value, a primary air pressure value, a primary air flow value and a pulverized coal feeder rotating speed.
Further, when the fuel-plant layer works, the gas set values comprise an oxygen flow set value, a secondary air flow set value and a natural gas flow set value; the oxygen flow set value is calculated according to the oxygen-fuel ratio, the excess coefficient, the natural gas flow value and the secondary air flow value; the secondary air flow set value is calculated according to the nitrogen flow value and the total nitrogen and air amount requirement (mixed gas set value); setting the natural gas flow set value empirically according to the running mode in the furnace;
the oxygen flow set value and the air flow set value are calculated according to the following formula:
SV1＝K1*K*FT1-FT2*0.21
SV2＝SV-FT3
wherein SV1 is the oxygen flow set value; k1 is the oxygen combustion ratio; k is an excess coefficient; FT1 is the natural gas flow value; FT2 is the flow value of the secondary air; SV2 is the secondary air flow set value; SV is the set value of the mixed gas, and FT3 is the flow value of nitrogen.
Further, the oxygen pressure value, the nitrogen pressure value, the secondary air pressure value and the primary air pressure value are checked, and whether the air pressure in the furnace body is stable or not is judged.
Furthermore, the system is also provided with an operator station and an OPC server, which are both connected with the switch through Ethernet, wherein the operator station is used for data monitoring, and the OPC server is used for uploading data to other systems.
The parameter configuration table for fuel one is shown in table 1 below when the fuel one plant layer is in operation. When the fuel two equipment layers work, the parameters of the primary air quantity, the secondary air quantity and the pulverized coal quantity are correspondingly set according to the running mode in the furnace, as shown in the following table 2.
TABLE 1 parameter configuration Table for Fuel one
TABLE 2 parameter configuration of Fuel two
In the table, SV represents a gas set value, MV preset represents a preset valve opening, and minimum represents a minimum set value.
Example 2
Based on the above embodiment, in a specific embodiment, the flow method shown in fig. 4 is adopted to realize intelligent dual-fuel switching control of the crude tin smelting furnace, and the management layer automatically selects the smelting furnace fuel by combining the field data collected by the control layer according to the operation plan condition, and selects corresponding data configuration according to the fuel to control the smelting furnace temperature. And judging the slag condition according to the actual smelting condition, and carrying out a slag discharging mode when the tin content of the slag is low, wherein the slag discharging is finished, and the blowing is automatically stopped. The method comprises the following steps:
s1: collecting a natural gas pressure value, and judging whether the natural gas pressure value is larger than a switching threshold value or not;
s2: if the switching threshold value is larger than the switching threshold value, starting a fuel-equipment layer to supply fuel I, entering a preparation mode in a furnace body operation mode, and entering S3; otherwise, starting the fuel two equipment layer to supply fuel two, entering a preparation mode in the furnace body operation mode, and entering S7;
s3: opening an oxygen purging valve, a natural gas purging valve and a nitrogen shut-off valve in a fuel-equipment layer, opening a nitrogen regulating valve and a secondary air regulating valve A to preset valve opening, and entering a converting mode in a furnace body operation mode;
s4: collecting equipment layer data in a fuel-equipment layer, judging whether any data of a natural gas flow value, an oxygen flow value, a secondary air flow value, a natural gas pressure value and an oxygen pressure value is smaller than a minimum set value, and if both the data are larger than the minimum set value, entering S5; otherwise, entering a preparation mode and returning to S3;
s5: closing an oxygen purging valve and a natural gas purging valve in a fuel-plant layer, opening an oxygen cutting valve and a natural gas cutting valve, opening an oxygen regulating valve A, a natural gas regulating valve, a nitrogen regulating valve and a secondary air regulating valve A to preset valve opening degrees, calculating a gas set value according to plant layer data, comparing the gas set value with the plant layer data according to the gas set value, and respectively regulating the opening degrees of the oxygen regulating valve A, the natural gas regulating valve, the nitrogen regulating valve and the secondary air regulating valve A through a PID (proportion integration differentiation) controller in a DCS (distributed control system) controller according to a comparison result and a preset gas set value; the opening of the secondary air regulating valve A is used for controlling the air flow to reach a secondary air flow set value;
s6: judging the slag condition, if the tin content is lower than a set tin value, entering a furnace body in a furnace body operation mode to discharge slag, and ending blowing when the slag discharge is ended; otherwise, continuing the converting mode and returning to S5;
s7: starting a primary air regulating valve, a secondary air regulating valve B and an oxygen regulating valve B in a fuel two-equipment layer, starting a pulverized coal feeder, and entering a converting mode in a furnace body operation mode;
s8: collecting equipment layer data in the fuel two equipment layers, judging whether any data in a primary air flow value, an oxygen flow value and a secondary air flow value are smaller than a minimum set value, and if so, entering S9; otherwise, entering a preparation mode and returning to S7;
s9: PID control of the primary air regulating valve, the secondary air regulating valve B and the oxygen regulating valve B is carried out according to a preset gas fixed value; judging the slag condition, if the tin content is lower than a set tin value, entering a furnace body in a furnace body operation mode to discharge slag, and ending blowing when the slag discharge is ended; otherwise, continuing the converting mode, and returning to S8.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The intelligent dual-fuel switching control system of the crude tin smelting furnace is characterized by comprising a DCS management layer, a DCS control layer and a field device layer;
the DCS management layer comprises a DCS engineer station and a DCS configuration server;
the DCS control layer comprises a DCS controller, a data acquisition module and an output data module; the DCS controller performs data interaction with the data acquisition module and the data output module; the DCS controller is connected and communicated with the DCS configuration server and the DCS engineer station through the exchanger;
the field device layer comprises a fuel one device layer and a fuel two device layer; the data acquisition module is connected and communicated with the first fuel equipment layer and the second fuel equipment layer, acquires equipment layer data and transmits the equipment layer data to the DCS controller; the DCS controller generates control instructions according to the furnace body operation mode and the equipment layer data and transmits the control instructions to the output data module, the output data module is connected and communicated with the first fuel equipment layer and the second fuel equipment layer, and the first fuel equipment layer or the second fuel equipment layer is controlled according to the control instructions.
2. The intelligent dual-fuel switching control system of the crude tin smelting furnace according to claim 1, wherein the fuel-plant layer comprises an oxygen pressure detector A, an oxygen shut-off valve, an oxygen flow detector A, an oxygen regulating valve A, a natural gas pressure detector, a natural gas shut-off valve, a natural gas flow detector, a natural gas regulating valve, an oxygen purge valve, a natural gas purge valve, a nitrogen pressure detector, a nitrogen shut-off valve, a nitrogen flow detector, a nitrogen regulating valve, a secondary air pressure detector A, a secondary air flow detector A, a secondary air regulating valve A and a spray gun;
the oxygen pressure detector A, the oxygen shut-off valve, the oxygen flow detector A and the oxygen regulating valve A are connected in sequence; the natural gas pressure detector, the natural gas cut-off valve, the natural gas flow detector and the natural gas regulating valve are connected in sequence; the nitrogen pressure detector, the nitrogen shut-off valve, the nitrogen flow detector and the nitrogen regulating valve are connected in sequence; the secondary air pressure detector A, the secondary air flow detector A and the secondary air regulating valve A are sequentially connected; the outlet end of the oxygen regulating valve A is respectively connected with the outlet end of the oxygen purging valve and the spray gun, the inlet end of the oxygen purging valve is connected with the inlet end of the nitrogen pressure detector and the inlet end of the natural gas purging valve, and the outlet end of the natural gas purging valve, the outlet end of the natural gas regulating valve, the outlet end of the nitrogen regulating valve and the outlet end of the overgrate air regulating valve A are all connected with the spray gun;
the oxygen pressure detector A, the oxygen flow detector A, the natural gas pressure detector, the natural gas flow detector, the nitrogen pressure detector, the nitrogen flow detector, the overgrate air pressure detector A and the overgrate air flow detector A are all electrically connected with the data acquisition module;
the oxygen shut-off valve, the oxygen regulating valve A, the natural gas shut-off valve, the natural gas regulating valve, the oxygen purging valve, the natural gas purging valve, the nitrogen shut-off valve, the nitrogen regulating valve and the secondary air regulating valve A are all electrically connected with the output data module;
the spray gun is inserted through an opening on the furnace body and is arranged in the furnace body.
3. The intelligent dual-fuel switching control system of the crude tin smelting furnace according to claim 2, wherein the fuel two equipment layers comprise a primary air pressure detector, a primary air flow detector, a primary air regulating valve, a pulverized coal bunker, a pulverized coal feeder, a secondary air pressure detector B, a secondary air flow detector B, a secondary air regulating valve B, an oxygen pressure detector B, an oxygen flow detector B and an oxygen regulating valve B;
the primary air pressure detector, the primary air flow detector and the primary air regulating valve are connected in sequence; the secondary air pressure detector B, the secondary air flow detector B and the secondary air regulating valve B are sequentially connected; the oxygen pressure detector B, the oxygen flow detector B and the oxygen regulating valve B are sequentially connected; the outlet end of the primary air regulating valve is connected to a connecting pipeline of the outlet end of the pulverized coal bin and the inlet end of the pulverized coal feeder, and the outlet end of the pulverized coal feeder, the outlet end of the secondary air regulating valve B and the outlet end of the oxygen regulating valve B are all connected to the furnace body;
the primary air pressure detector, the primary air flow detector, the pulverized coal feeder, the secondary air pressure detector B, the secondary air flow detector B, the oxygen pressure detector B and the oxygen flow detector B are all electrically connected with the data acquisition module;
the primary air regulating valve, the pulverized coal feeder, the secondary air regulating valve B and the oxygen regulating valve B are all electrically connected with the output data module.
4. The intelligent dual-fuel switching control system of the crude tin smelting furnace according to claim 1, wherein first fuel filled in the first fuel equipment layer is natural gas, and second fuel filled in the second fuel equipment layer is pulverized coal; judging the supply condition of the first fuel through the natural gas pressure value acquired by the natural gas pressure detector in the first fuel equipment layer, and performing automatic fuel switching control by the DCS controller according to the supply condition of the first fuel; the system preferably uses the first fuel device layer to supply power when the first fuel supply is sufficient, and switches to use the second fuel device layer to supply power when the first fuel supply is insufficient.
5. The intelligent dual-fuel switching control system of the crude tin smelting furnace according to claim 3, wherein the furnace body operation modes comprise a preparation mode, a blowing mode and furnace body deslagging, different valve openings are preset for different regulating valves and cut-off valves in a DCS controller at the initial moment of the switching mode for different modes, or the valves are controlled to be opened, and when the furnace body operation modes are automatically switched in different equipment layer operation modes, corresponding valves of different equipment layers are switched to the preset valve openings or are opened.
6. The intelligent dual-fuel switching control system of the crude tin smelting furnace according to claim 5, wherein when a fuel-plant layer works, the system is switched to a preparation mode, the opening of a valve is preset for a nitrogen regulating valve and a secondary air regulating valve A, corresponding gas fixed values are set for nitrogen ventilation and secondary air ventilation, and a PID controller in a DCS controller adjusts the opening of the corresponding regulating valve according to the gas fixed values and plant layer data;
the preparation mode is switched to a converting mode, the opening of the valves is preset for the nitrogen regulating valve, the secondary air regulating valve A, the oxygen regulating valve A and the natural gas regulating valve, corresponding gas set values are calculated for the secondary air ventilation and the oxygen ventilation according to equipment layer data through an algorithm deployed in the DCS controller, corresponding gas fixed values are set for the nitrogen ventilation and the natural gas ventilation, and the PID controller adjusts the opening of the corresponding regulating valve according to the gas fixed values, the equipment layer data and the gas set values;
and switching the hammer refining mode to a slag discharging mode, and presetting valve openings of a nitrogen regulating valve, a secondary air regulating valve A, an oxygen regulating valve A and a natural gas regulating valve.
7. The intelligent dual-fuel switching control system of the crude tin smelting furnace according to claim 5, wherein when the fuel two equipment layers work, the DSC controller controls the primary air regulating valve, the secondary air regulating valve B and the oxygen regulating valve B to be opened in a preparation mode, and corresponding gas fixed values are set for the primary air ventilation amount and the secondary air ventilation amount;
and in the converting mode and the deslagging mode, setting corresponding gas fixed values for the primary air ventilation volume, the secondary air ventilation volume and the oxygen ventilation volume, and adjusting the opening of corresponding valves and/or the rotating speed of the pulverized coal feeder according to the preset gas fixed values.
8. The intelligent dual-fuel switching control system of the crude tin smelting furnace according to claim 6, wherein the gas set point comprises an oxygen flow set point and a secondary air flow set point when the fuel-plant layer works; the oxygen flow set value is calculated according to the oxygen-fuel ratio, the excess coefficient, the natural gas flow value and the secondary air flow value; the secondary air flow set value is calculated according to the nitrogen flow value and the mixed gas set value;
the oxygen flow set value and the air flow set value are calculated according to the following formula:
SV1＝K1*K*FT1-FT2*0.21
SV2＝SV-FT3
wherein SV1 is the oxygen flow set value; k1 is the oxygen combustion ratio; k is an excess coefficient; FT1 is the natural gas flow value detected by the natural gas flow detector; FT2 is the secondary air flow value detected by the secondary air flow detector A; SV2 is the secondary air flow set value; SV is the set value of the mixed gas, and FT3 is the value of the nitrogen flow detected by the nitrogen flow detector.
9. An intelligent dual-fuel switching control method for a crude tin smelting furnace, which is characterized by being applied to the intelligent dual-fuel switching control method for the crude tin smelting furnace, according to any one of claims 3-8, and comprising the following steps:
step 1: collecting a natural gas pressure value, and judging whether the natural gas pressure value is larger than a switching threshold value or not;
step 2: if the switching threshold value is larger than the switching threshold value, starting a fuel-equipment layer to supply fuel I, entering a preparation mode in a furnace body operation mode, and entering a step 3; otherwise, starting the fuel two equipment layer to supply fuel two, entering a preparation mode in the furnace body operation mode, and entering a step 7;
step 3: opening an oxygen purging valve, a natural gas purging valve and a nitrogen shut-off valve in a fuel-equipment layer, opening a nitrogen regulating valve and a secondary air regulating valve A to preset valve opening, and entering a converting mode in a furnace body operation mode;
step 4: collecting equipment layer data in a fuel-equipment layer, judging whether any data of a natural gas flow value, an oxygen flow value, a secondary air flow value, a natural gas pressure value and an oxygen pressure value is smaller than a minimum set value, and if both the data are larger than the minimum set value, entering a step 5; otherwise, entering a preparation mode and returning to the step 3;
step 5: closing an oxygen purging valve and a natural gas purging valve in a fuel-plant layer, opening an oxygen cutting valve and a natural gas cutting valve, opening an oxygen regulating valve A, a natural gas regulating valve, a nitrogen regulating valve and a secondary air regulating valve A to preset valve opening degrees, calculating a gas set value according to plant layer data, and respectively regulating the opening degrees of the oxygen regulating valve A, the natural gas regulating valve, the nitrogen regulating valve and the secondary air regulating valve A through a PID (proportion integration differentiation) controller in a DCS (distributed control system) controller according to the gas set value, the plant layer data and a preset gas fixed value;
step 6: judging the slag condition, if the tin content is lower than a set tin value, entering a furnace body in a furnace body operation mode to discharge slag, and ending blowing when the slag discharge is ended; otherwise, continuing the converting mode and returning to the step 5;
step 7: starting a primary air regulating valve, a secondary air regulating valve B and an oxygen regulating valve B in a fuel two-equipment layer, starting a pulverized coal feeder, and entering a converting mode in a furnace body operation mode;
step 8: collecting equipment layer data in the two fuel equipment layers, judging whether any data of a primary air flow value, an oxygen flow value and a secondary air flow value is smaller than a minimum set value, and if so, entering a step 9; otherwise, entering a preparation mode and returning to the step 7;
step 9: PID control of the primary air regulating valve, the secondary air regulating valve B and the oxygen regulating valve B is carried out according to a preset gas fixed value; judging the slag condition, if the tin content is lower than a set tin value, entering a furnace body in a furnace body operation mode to discharge slag, and ending blowing when the slag discharge is ended; otherwise, continuing the converting mode and returning to the step 8.
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| CN202311364419.0A CN117215272A (en) | 2023-10-20 | 2023-10-20 | Intelligent dual-fuel switching control system and method for crude tin smelting furnace |
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| CN202311364419.0A CN117215272A (en) | 2023-10-20 | 2023-10-20 | Intelligent dual-fuel switching control system and method for crude tin smelting furnace |
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