Carbon-saving combustion intelligent control system for melting furnace of glass factory

Abstract

The invention relates to the technical field of glass manufacturing, in particular to a carbon-saving combustion intelligent control system for a melting furnace of a glass factory. Comprising on-line gas component detection devices which are respectively arranged in furnace cavities of a plurality of sub-furnaces on two sides of the glass melting furnace; the combustion optimization controller is used for generating a dynamic combustion air ratio; the combustion control subsystem is used for generating a natural gas flow signal and a combustion-supporting air flow signal according to the dynamic combustion-air ratio; the natural gas subsystem is used for adjustably introducing natural gas into the sub-furnace according to the natural gas flow signal; and the combustion-supporting air subsystem is used for adjustably introducing combustion-supporting air into the sub-furnace according to the combustion-supporting air flow signal. The online gas component detection device is arranged, the heat-resistant temperature is high, the concentration of oxygen and carbon monoxide in the furnace cavity of the sub-furnace can be measured in real time and used for feedback regulation and control in real time, and therefore the purpose of optimizing the fuel / air ratio is achieved, and the effect of time measurement and time control is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of glass manufacturing, and in particular to a carbon-saving combustion intelligent control system for a melting furnace in a glass factory. Background Art

[0002] Glass melting furnace is a thermal equipment for melting glass, usually made of refractory materials. It uses the heat generated by the chemical energy of fuel, electrical energy or other energy sources to create a controllable high temperature environment, so that the glass batch undergoes heat transfer and momentum transfer processes, completes physical and chemical changes, and produces a certain amount and quality of glass liquid through melting, clarification, homogenization and cooling stages. Glass melting furnace is the most critical equipment in glass production.

[0003] In order to complete the glass melting process with high quality, how to reasonably control the combustion system of the melting furnace is a key factor. Among the steps of controlling the combustion system of the melting furnace, the control of the fuel / air ratio, that is, the ratio of fuel and air volume, is the key factor of the carbon-saving combustion system. In the past, the determination of the fuel / air ratio, that is, the ratio of natural gas flow and combustion-supporting air flow, was determined by the offline detection system combined with manual experience to determine the set value; the principle of offline detection and control of the fuel / air ratio, see Figure 4 There are three ways to judge whether the adjustment is reasonable, as follows:

[0004] 1.Fix the zirconium oxide oxygen analyzer in the main flue to measure the residual oxygen content in the main flue.

[0005] 2. The on-duty personnel conduct inspections and use a handheld oxygen analyzer to measure the residual oxygen content in the flues of each pair of sub-furnaces.

[0006] 3. The 24-hour on-duty personnel in the central control room monitor the flame status on both sides of the furnace through the industrial TV on the rear gable wall; for the industrial TV monitoring process, see Figure 3 The state of the flame mainly includes: stability, such as whether it floats or flames out; brightness, such as whether it is clear and powerful, without stratification or floating; speed, such as whether it maintains a certain rigidity, etc.

[0007] The shortcomings of the prior art are threefold, as follows:

[0008] 1. The flue gas temperature of the zirconia oxygen analyzer is generally less than 700℃, and it cannot be installed on each pair of sub-furnace branch flues to measure the residual oxygen content; because the flue gas of the sub-furnace branch flues is above 700℃. The flue gas of the total flue is the total flue gas after the sum of the flue gas of each pair of sub-furnaces, and each pair of sub-furnaces burns independently. The residual oxygen content of the total flue cannot indicate which pair of sub-furnaces is fully burned and which pair of sub-furnaces is not fully burned. The residual oxygen content of the total flue can only indicate whether the combustion of the melting furnace is sufficient and reasonable as a whole. If it is unreasonable, the valve can only be adjusted afterwards to adjust the fuel / air ratio, and the control has hysteresis.

[0009] 2. Although the handheld oxygen analyzer can measure the residual oxygen content in each pair of sub-furnace flues, it is still an offline measurement, requiring technicians to run to the site to measure one by one. The measurement is slow and troublesome, and the control lag is more obvious.

[0010] 3. Manual monitoring of the burning flame status on both sides of the melting furnace is subjective and also relies heavily on the experience of technicians. It lacks the support of objective data and has limited control accuracy. Summary of the invention

[0011] The purpose of the present invention is to provide a carbon-saving combustion intelligent control system for a glass factory melting furnace to solve the above technical problems;

[0012] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0013] An intelligent carbon-saving combustion control system for a glass factory melting furnace, comprising:

[0014] An online gas composition detection device is respectively arranged in the furnace cavities of several sub-furnaces on both sides of the glass melting furnace, and is used to detect the gas composition during the combustion process of the sub-furnaces and output a gas composition detection signal;

[0015] A combustion optimization controller, connected to the online gas composition detection device, for performing optimization control calculations according to the gas composition detection signal to generate a dynamic fuel-air ratio;

[0016] A combustion control subsystem, connected to the combustion optimization controller, for generating a natural gas flow signal and a combustion-supporting air flow signal according to the dynamic fuel-air ratio;

[0017] A natural gas subsystem, connected to the sub-furnace, and used to adjustably introduce natural gas into the sub-furnace according to the natural gas flow signal;

[0018] The combustion-supporting air subsystem is connected to the sub-furnace and is used to adjustably introduce combustion-supporting air into the sub-furnace according to the combustion-supporting air flow signal.

[0019] Preferably, the natural gas subsystem includes a natural gas fine-tuning module, and the natural gas fine-tuning module includes a plurality of natural gas fine-tuning mechanisms respectively connected to the sub-furnaces, and each of the natural gas fine-tuning mechanisms has the same structure, including:

[0020] A first solenoid valve is provided on the compressed air inlet pipeline and can controllably supply compressed air to the natural gas fine adjustment mechanism;

[0021] A pneumatic valve, wherein the inlet of the pneumatic valve is connected to the natural gas supply end, the outlet of the pneumatic valve is connected to the sub-furnace, and the driving end of the pneumatic valve is connected to the outlet of the first solenoid valve, and the pneumatic valve can controllably deliver a set flow of natural gas to the sub-furnace according to the supplied compressed air;

[0022] A flow control device is provided on the connecting pipeline between the pneumatic valve and the natural gas supply end, and is used to obtain the natural gas flow value passing through the pneumatic valve, and output a first control signal to the first solenoid valve according to the comparison result of the obtained natural gas flow value and the natural gas flow signal to adjust the flow of compressed air so as to control the opening of the pneumatic valve to adjust the flow of natural gas.

[0023] Preferably, the flow control device comprises:

[0024] A flow sensor is provided on the connecting pipeline between the pneumatic valve and the natural gas supply end to obtain a natural gas flow sensing signal;

[0025] A flow meter, connected to the flow probe, for calculating the flow value of the natural gas according to the natural gas flow sensing signal;

[0026] A natural gas flow control unit is connected to the flow meter, and an output end of the natural gas flow control unit is connected to the first solenoid valve, for outputting the first control signal to the first solenoid valve according to the natural gas flow value passing through the pneumatic valve.

[0027] Preferably, the natural gas subsystem further comprises a natural gas rough adjustment module, and the natural gas rough adjustment module comprises:

[0028] A main solenoid valve is arranged on the compressed air inlet pipeline and can controllably supply compressed air to the natural gas rough adjustment module;

[0029] A main pneumatic valve, wherein the inlet of the main pneumatic valve is connected to the initial gas supply end of natural gas, the outlet of the main pneumatic valve is connected to the natural gas fine-tuning module as the natural gas supply end, and the driving end of the main pneumatic valve is connected to the outlet of the solenoid valve, and can controllably deliver a preset flow of natural gas to the natural gas fine-tuning module according to the supplied compressed air;

[0030] The total flow calculation device is arranged on the pipeline between the pneumatic valve and the natural gas initial supply end, and is used to obtain the natural gas flow value passing through the total pneumatic valve.

[0031] Preferably, the natural gas rough adjustment module further includes a pressure control device, and the pressure control device includes:

[0032] A pressure probe, disposed at the outlet of the main pneumatic valve, for obtaining a pressure detection signal at the outlet of the main pneumatic valve;

[0033] A pressure transmitter unit, connected to the pressure probe, for calculating the pressure value at the outlet of the main pneumatic valve according to the pressure detection signal;

[0034] A pressure regulating unit is connected to the pressure transmitting unit to receive the pressure value, and the output end of the pressure regulating unit is connected to the main solenoid valve, which is used to output a second control signal to the main solenoid valve according to the pressure value at the outlet of the main pneumatic valve to adjust the flow rate of compressed air so as to control the opening of the main pneumatic valve to adjust the flow rate of natural gas.

[0035] Preferably, the natural gas rough adjustment module further includes:

[0036] A total shutoff valve is provided on the pipeline between the total flow calculation device and the natural gas initial supply end;

[0037] A first time control unit is arranged on the compressed air intake pipeline and connected to the main cut-off valve, and can controllably deliver compressed air to the main cut-off valve for driving the main cut-off valve;

[0038] The first in-position switch and the second in-position switch are connected to the main cut-off valve and are used to detect the opening position of the main cut-off valve.

[0039] Preferably, the combustion-supporting air subsystem comprises:

[0040] A combustion-supporting fan, used to provide combustion-supporting air to the combustion-supporting air delivery pipeline;

[0041] a second solenoid valve, wherein the inlet of the second solenoid valve is connected to the combustion-supporting air delivery pipeline, and the outlet of the second solenoid valve is connected to the sub-furnace;

[0042] A combustion-supporting air flow control unit is connected to the combustion control subsystem to receive the combustion-supporting air flow signal. The control end of the combustion-supporting air flow control unit is connected to the second solenoid valve, and is used to output a third control signal to the second solenoid valve according to the combustion-supporting air flow signal, so as to control the opening of the second solenoid valve to adjust the combustion-supporting air flow sent to the sub-furnace.

[0043] Preferably, the combustion-supporting wind subsystem further includes:

[0044] A pressure sensing device, provided on the combustion-supporting air delivery pipeline, for obtaining pressure data of the combustion-supporting air delivery pipeline;

[0045] A temperature sensing device, provided on the combustion-supporting air delivery pipeline, for obtaining temperature data of the combustion-supporting air delivery pipeline;

[0046] A flow sensing device, arranged on the combustion-supporting air delivery pipeline, for obtaining flow data of the combustion-supporting air delivery pipeline;

[0047] The shut-off valve comprises a first-side shut-off valve provided on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the first side and the combustion-supporting air fan, and a second-side shut-off valve provided on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the second side and the combustion-supporting air fan;

[0048] A second time control unit, connected to the cut-off valve, for controlling the opening or closing of the cut-off valve;

[0049] A third in-position switch and a fourth in-position switch are connected to the first side cut-off valve and are used to detect the opening position of the first side cut-off valve;

[0050] A fifth in-position switch and a sixth in-position switch are connected to the second-side shutoff valve and are used to detect the opening position of the second-side shutoff valve;

[0051] A gas cut-off alarm device is used to detect the combustion-supporting air in the combustion-supporting air delivery pipeline and to issue an alarm when the combustion-supporting air is not detected. The gas cut-off alarm device includes a first-side gas cut-off alarm device on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the first side and the combustion-supporting fan, and a second-side gas cut-off alarm device on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the second side and the combustion-supporting fan.

[0052] Preferably, the online gas composition detection device comprises:

[0053] The gas composition detection probes are respectively arranged in the furnace cavity of the sub-furnace to detect the carbon monoxide and oxygen content and generate gas composition sensing signals.

[0054] A gas composition transmission unit, connected to the gas composition detection probe, and configured to output the gas composition detection signal according to the gas composition sensing signal;

[0055] The gas composition alarm unit is connected to the gas composition transmission unit and is used to analyze the gas composition detection signal and issue an alarm according to the analysis result.

[0056] Preferably, it also includes,

[0057] An oxygen analyzer, used to collect the residual oxygen content of the main flue of the glass melting furnace and the branch flue of the sub-furnace;

[0058] The rear gable industrial television is arranged on the rear gable of the glass melting furnace, and the burning state of the flame inside the glass melting furnace can be observed through the holes in the rear gable.

[0059] Beneficial effects of the present invention: Due to the adoption of the above technical scheme, the present invention, by setting an online gas composition detection device, has a high heat resistance temperature, can measure the concentrations of oxygen and carbon monoxide in the cavity of the sub-furnace in real time, and use it for real-time feedback regulation, so as to achieve the purpose of optimizing the fuel / wind ratio and realize the effect of real-time measurement and control; and the residual oxygen content of each pair of sub-furnaces is measured separately, and the valves of each pair of sub-furnaces are controlled separately, so that the control accuracy is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 Schematic diagram of the distribution of an online gas composition detection device in an embodiment of the present invention;

[0061] Figure 2 This is a schematic diagram of the fuel / air ratio online detection control principle in an embodiment of the present invention;

[0062] Figure 3 This is a schematic diagram of the distribution of industrial televisions on the rear gable wall in an embodiment of the present invention;

[0063] Figure 4 This is a schematic diagram of the fuel / air ratio online detection control principle in the prior art;

[0064] Figure 5 This is a structural schematic diagram of a natural gas fine-tuning module in an embodiment of the present invention;

[0065] Figure 6 This is a schematic diagram of the structure of a natural gas rough adjustment module in an embodiment of the present invention;

[0066] Figure 7 This is a schematic diagram of the structure of the combustion-supporting air subsystem in an embodiment of the present invention;

[0067] Figure 8 This is a flow chart of the fire-changing procedure in an embodiment of the present invention;

[0068] Fig. 9 It is a flow chart of the ignition program in an embodiment of the present invention. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0072] An intelligent control system for carbon-saving combustion in glass factory furnaces, such as Figures 1 to 7 Shown, including

[0073] The online gas composition detection device 1 is respectively arranged in the furnace cavities of several sub-furnaces on both sides of the glass melting furnace 2, and is used to detect the gas composition during the combustion process of the sub-furnace and output a gas composition detection signal;

[0074] The combustion optimization controller 3 is connected to the online gas composition detection device 1 and is used to perform optimization control calculation according to the gas composition detection signal to generate a dynamic fuel-air ratio;

[0075] The combustion control subsystem 4 is connected to the combustion optimization controller 3 and is used to generate a natural gas flow signal and a combustion-supporting air flow signal according to a dynamic fuel-air ratio;

[0076] The natural gas subsystem 5 is connected to the sub-furnace and is used to adjustably introduce natural gas into the sub-furnace according to the natural gas flow signal;

[0077] The combustion-supporting air subsystem 6 is connected to the sub-furnace and is used to adjustably introduce combustion-supporting air into the sub-furnace according to the combustion-supporting air flow signal.

[0078] Specifically, the fuel can be completely burned only after being atomized by compressed air and mixed with a certain amount of combustion air. If the amount of combustion air is small, the fuel will not burn completely due to insufficient oxygen, and the heat will be discharged with the flue gas, resulting in a waste of fuel, while generating too much carbon monoxide to pollute the environment. If the amount of combustion air is too much, the heat carried away with the exhaust gas will also increase, which will also affect the thermal efficiency, resulting in a waste of fuel, and also aggravate sulfur oxide corrosion and nitrogen oxide generation, also polluting the environment. Therefore, determining a reasonable fuel / air ratio, maintaining a certain excess air coefficient, and striving to achieve complete combustion in the furnace with the smallest possible excess air coefficient will have a greater effect on energy saving, consumption reduction, and environmental protection.

[0079] The present invention provides a carbon-saving combustion control system for a glass factory melting furnace. An online gas composition detection device 1 is used as an oxygen and carbon monoxide concentration detection instrument. The specific model can be GYF-600. The online gas composition detection device 1 can measure a hot furnace environment of 1500°C and above. A technician can drill holes on both sides of the furnace wall of each sub-furnace (small furnace) to install a laser online gas composition detection device 1. When the sub-furnace fuel is burning, the oxygen and carbon monoxide concentrations in the furnace cavities of each pair of sub-furnaces are measured in real time, and the gas composition detection signal is transmitted to a combustion optimization controller 3 and a combustion control subsystem 4 (DCS system) in real time. The currently fed back O2 and CO contents are compared with the set target O2 and CO contents. The valve openings of a natural gas subsystem 5 and a combustion-supporting air subsystem 6 are adjusted by a PID incremental adjustment method, thereby achieving the purpose of adjusting the air flow and optimizing the fuel / air ratio, and finally making the residual oxygen and carbon monoxide concentrations in the furnace reach the target area and tend to be stable.

[0080] The improvement of the real-time online detection control of the present invention is obviously better than the solution provided by the prior art, achieving the effect of real-time measurement and control, and realizing the separate measurement of the residual oxygen content of each sub-furnace and the separate control of the valve of each sub-furnace, thereby further improving the control accuracy.

[0081] In a preferred embodiment, the natural gas subsystem 5 includes a natural gas fine-tuning module, which includes a plurality of natural gas fine-tuning mechanisms 51 respectively connected to the sub-furnaces, and each natural gas fine-tuning mechanism 51 has the same structure, including:

[0082] The first solenoid valve 511 is disposed on the compressed air intake pipeline and can controllably supply compressed air to the natural gas fine adjustment mechanism 51;

[0083] A pneumatic valve 512, the inlet of which is connected to the natural gas supply end 57, the outlet of which is connected to the sub-furnace, and the driving end of which is connected to the outlet of the first solenoid valve 511, and can controllably deliver a set flow of natural gas to the sub-furnace according to the supplied compressed air;

[0084] The flow control device 513 is arranged on the connecting pipeline between the pneumatic valve 512 and the natural gas supply end 57, and is used to obtain the natural gas flow value passing through the pneumatic valve 512, and output a first control signal to the first solenoid valve 511 to adjust the flow of compressed air based on the comparison result of the obtained natural gas flow value and the natural gas flow signal, so as to control the opening of the pneumatic valve 512 to adjust the flow of natural gas.

[0085] Specifically, the present invention uses a pneumatic valve 512 as a valve for natural gas. The thrust required for the pneumatic valve 512 is relatively large. Therefore, the present invention opens the pneumatic valve 512 by introducing compressed air. The flow control device 513 detects the natural gas flow value passing through the pneumatic valve 512 to determine whether the current natural gas flow value meets the flow value corresponding to the natural gas flow signal. If it does not meet the flow value, the flow of compressed air is adjusted by controlling the solenoid valve, thereby accurately controlling the opening of the pneumatic valve 512 and adjusting the flow of natural gas to make it approach the set target flow continuously, thereby achieving accurate control of the natural gas flow of each sub-furnace and meeting the combustion requirements of the sub-furnace.

[0086] In a preferred embodiment, the flow control device 513 includes:

[0087] The flow sensor 514 is provided on the connecting pipeline between the pneumatic valve 512 and the natural gas supply end 57 to obtain the natural gas flow sensing signal;

[0088] The flow meter 515 is connected to the flow probe 514 and is used to calculate the flow value of the natural gas according to the natural gas flow sensing signal;

[0089] The natural gas flow control unit 516 is connected to the flow meter 515 , and the output end of the natural gas flow control unit 516 is connected to the first solenoid valve 511 , and is used to output a first control signal to the first solenoid valve 511 according to the natural gas flow value passing through the pneumatic valve 512 .

[0090] In a preferred embodiment, the natural gas subsystem 5 further includes a natural gas rough adjustment module, which includes:

[0091] The main solenoid valve 521 is arranged on the compressed air inlet pipeline and can controllably supply compressed air to the natural gas coarse adjustment module;

[0092] A main pneumatic valve 522, the inlet of which is connected to the natural gas initial supply end 58, the outlet of which is connected to the natural gas fine-tuning module as the natural gas supply end 57, and the driving end of the main pneumatic valve 522 is connected to the outlet of the solenoid valve, and can controllably deliver a preset flow of natural gas to the natural gas fine-tuning module according to the supplied compressed air;

[0093] The total flow calculation device 523 is disposed on the pipeline between the pneumatic valve 512 and the natural gas initial supply end 58 , and is used to obtain the natural gas flow value passing through the total pneumatic valve 522 .

[0094] Specifically, the natural gas coarse adjustment module in the present invention is used to make a preliminary adjustment to the natural gas at the initial natural gas supply end 58 so as to preliminarily meet the combustion requirements of the sub-furnaces, and then the natural gas fine adjustment module is used to make fine adjustments to each sub-furnace so as to meet the feedback O2 and CO contents to reach the set target O2 and CO.

[0095] Specifically, the total flow calculation device 523 includes:

[0096] The total flow sensor 531 is provided at the inlet pipeline of the total pneumatic valve 522 and is used to detect the natural gas flow signal passing through the total pneumatic valve 522;

[0097] A total flow transmission unit 532, connected to the total flow probe 531, is used to calculate the flow value according to the natural gas flow signal;

[0098] The total flow meter 533 is connected to the total flow transmission unit 532 and is used to accumulate the natural gas flow value passing through the total pneumatic valve 522 .

[0099] In a preferred embodiment, the natural gas rough adjustment module further includes a pressure control device 54, and the pressure control device 54 includes:

[0100] The pressure probe 541 is provided at the outlet of the main pneumatic valve 522 and is used to obtain a pressure detection signal at the outlet of the main pneumatic valve 522;

[0101] A pressure transmitter unit 542, connected to the pressure probe 541, for calculating the pressure value at the outlet of the main pneumatic valve 522 according to the pressure detection signal;

[0102] The pressure regulating unit 543 is connected to the pressure transmitting unit 542 to receive the pressure value. The output end of the pressure regulating unit 543 is connected to the main solenoid valve 521, which is used to output a second control signal to the main solenoid valve 521 based on the pressure value at the outlet of the main pneumatic valve 522 to adjust the flow of compressed air so as to control the opening of the main pneumatic valve 522 and adjust the flow of natural gas.

[0103] Specifically, the natural gas flow feedback of the natural gas coarse adjustment module in the present invention is executed by the pressure control device 54, and the pressure control device 54 outputs a second control signal to the main solenoid valve 521 to adjust the flow of compressed air to control the opening of the main pneumatic valve 522 to adjust the flow of natural gas, rather than the total flow calculation device 523. This is because the reaction speed of the pressure transmission unit 542 is faster than that of the total flow calculation device 523, and it is more sensitive to the change of flow, which is more conducive to the adjustment of the main pneumatic valve 522. In addition, the pressure control device 54 is arranged downstream of the outlet of the main pneumatic valve 522, which is more conducive to improving the measurement accuracy.

[0104] In a preferred embodiment, the natural gas rough adjustment module further includes:

[0105] A total shutoff valve 525 is provided on the pipeline between the total flow calculation device 523 and the natural gas initial supply end 58;

[0106] The first time control unit 551 is disposed on the compressed air intake pipeline and connected to the main shutoff valve 525, and can controllably deliver compressed air to the main shutoff valve 525 for driving the main shutoff valve 525;

[0107] The first in-position switch 552 and the second in-position switch 553 are connected to the main shut-off valve 525 and are used to detect the opening position of the main shut-off valve 525 .

[0108] In a preferred embodiment, the combustion-supporting air subsystem 6 includes:

[0109] The combustion-supporting fan 61 is used to provide combustion-supporting air to the combustion-supporting air delivery pipeline;

[0110] A second solenoid valve 62, the inlet of the second solenoid valve 62 is connected to the combustion-supporting air delivery pipeline, and the outlet of the second solenoid valve 62 is connected to the sub-furnace;

[0111] The combustion-supporting air flow control unit 63 is connected to the combustion control subsystem 4 to receive the combustion-supporting air flow signal. The control end of the combustion-supporting air flow control unit 63 is connected to the second solenoid valve 62, which is used to output a third control signal to the second solenoid valve 62 according to the combustion-supporting air flow signal, and control the opening of the second solenoid valve 62 to adjust the combustion-supporting air flow sent to the sub-furnace.

[0112] In a preferred embodiment, the combustion-supporting air subsystem 6 further includes:

[0113] A pressure sensing device 66 is provided on the combustion-supporting air delivery pipeline and is used to obtain pressure data of the combustion-supporting air delivery pipeline;

[0114] The temperature sensing device 67 is provided on the combustion-supporting air delivery pipeline and is used to obtain the temperature data of the combustion-supporting air delivery pipeline;

[0115] A flow sensing device 68 is provided on the combustion-supporting air delivery pipeline and is used to obtain flow data of the combustion-supporting air delivery pipeline;

[0116] The shut-off valve 64 includes a first-side shut-off valve 641 disposed on the combustion-supporting air delivery pipeline between the inlet of the first-side sub-furnace and the combustion-supporting air fan 61, and a second-side shut-off valve 642 disposed on the combustion-supporting air delivery pipeline between the inlet of the second-side sub-furnace and the combustion-supporting air fan 61;

[0117] A second time control unit 643, connected to the shutoff valve 64, for controlling the opening or closing of the shutoff valve 64;

[0118] The third in-position switch 644 and the fourth in-position switch 645 are connected to the first-side shut-off valve 641 and are used to detect the opening position of the first-side shut-off valve 641;

[0119] The fifth in-position switch 646 and the sixth in-position switch 647 are connected to the second-side shutoff valve 642 and are used to detect the opening position of the second-side shutoff valve 642;

[0120] The gas cut-off alarm device 65 is used to detect the combustion-supporting air in the combustion-supporting air delivery pipeline and to issue an alarm when the combustion-supporting air is not detected. The gas cut-off alarm device includes a first-side gas cut-off alarm device 651 arranged on the combustion-supporting air delivery pipeline between the inlet of the first-side sub-furnace and the combustion-supporting fan 61, and a second-side gas cut-off alarm device 652 arranged on the combustion-supporting air delivery pipeline between the inlet of the second-side sub-furnace and the combustion-supporting fan 61.

[0121] Specifically, the pressure sensing device 66, the temperature sensing device 6 and the flow sensing device 68 are all arranged on the combustion-supporting air delivery pipeline, and are respectively used to obtain the pressure data, temperature data and flow data of the combustion-supporting air delivery pipeline, and the obtained data do not participate in feedback control, wherein the pressure sensing device 66 includes a pressure sensing probe 661 arranged on the combustion-supporting air delivery pipeline, a pressure sensing transmitter unit 662 connected to the pressure sensing probe 661, and a pressure accumulation unit 663 connected to the pressure sensing transmitter unit 662; the temperature sensing device 67 includes a temperature sensing probe 671 arranged on the combustion-supporting air delivery pipeline, a temperature sensing transmitter unit 672 connected to the temperature sensing probe 671, and a temperature accumulation unit 673 connected to the temperature sensing transmitter unit 672; the flow sensing device 68 includes a flow sensing probe 681 arranged on the combustion-supporting air delivery pipeline, a flow sensing transmitter unit 682 connected to the flow sensing probe 681, and a flow accumulation unit 683 connected to the flow sensing transmitter unit 682.

[0122] Specifically, the present invention can be provided with a plurality of combustion-supporting fans 61, which can work simultaneously and can also be used as backup supplements. The combustion-supporting fans 61 are driven respectively by their corresponding fan control cabinets 69. In this embodiment, the functional units inside the fan control cabinet 69 include at least: a valve closing control unit 691, a start control unit 692, a stop control unit 693, a current indication unit 694, a speed control unit 695, a remote control unit 696, a ready state unit 697, an operation control unit 698, a fault indication unit 699 and a valve opening control unit 690.

[0123] In a preferred embodiment, the online gas composition detection device 1 comprises:

[0124] The gas composition detection probes 11 are respectively arranged in the furnace cavity of the sub-furnace to detect the carbon monoxide and oxygen content and generate gas composition sensing signals.

[0125] The gas composition transmission unit 12 is connected to the gas composition detection probe 11 and is used to output a gas composition detection signal according to the gas composition sensing signal;

[0126] The gas composition alarm unit 13 is connected to the gas composition transmission unit 12 and is used for analyzing the gas composition detection signal and issuing an alarm according to the analysis result.

[0127] In a preferred embodiment, it also includes:

[0128] Oxygen analyzer, used to collect residual oxygen content in the main flue and branch flues of the sub-furnace of glass melting furnace 2;

[0129] The rear gable industrial television 23 is arranged on the rear gable of the glass melting furnace 2, and the burning state of the flame inside the glass melting furnace 2 can be observed through the holes in the rear gable.

[0130] Specifically, the present invention, based on the improvement of the prior art, still retains the offline detection part of the prior art, which is used as a verification and backup for the present invention. When the online gas composition detection device 1 fails, the offline detection part can continue to work, and the detected data can be used as a basis for manual experience control.

[0131] Specifically, the oxygen analyzer includes a zirconia oxygen analyzer 21 and a handheld oxygen analyzer 22 . The zirconia oxygen analyzer 21 includes an offline probe 211 arranged at a total flue detection point, an offline transmission unit 212 connected to the offline probe 211 , and an offline alarm unit 213 connected to the offline transmission unit 212 .

[0132] To be more specific, the present invention drills holes in the furnace wall on both sides of each pair of sub-furnaces, and the online gas composition detection device 1 is installed according to the equipment requirements. The signal is transmitted to the combustion control subsystem 4 (DCS system), and the transmitted signal needs to be analyzed and indicated and participate in feedback control; secondly, a zirconium oxide oxygen analyzer 21 is drilled and installed at the main flue, and the signal is transmitted to the DCS. The transmitted signal needs to be analyzed and indicated by the offline transmission unit 212 and an over-limit alarm is issued by the offline alarm unit 213, but does not participate in feedback control.

[0133] Specifically, the present invention installs the rear gable industrial TV 23 in place. The debugging personnel observe the combustion state of the flame inside the melting furnace through the hole in the rear gable. The following three points are mainly observed: stability, such as whether it is floating, de-fired, etc.; brightness, such as whether it is clear and strong, without stratification and floating; speed, such as whether it maintains a certain rigidity, etc.

[0134] In order to better observe the burning state of the flame, the rear gable industrial TV 23 needs to use a color camera and an automatic lens advance and retreat device. Because the ambient temperature at the rear gable is 100°C or above, stainless steel cooling water and gas protection sleeves, cooling water and gas pipes are also required to ensure the reliable use of the rear gable industrial TV 23.

[0135] The present invention is further provided with monitoring devices for monitoring the use status of the equipment, including at least a sub-furnace aisle monitoring device 25 located between the heat storage chamber 24 and the glass melting furnace 2, a silo monitoring device 26 and a feeding port monitoring device 27 located at the feed end, and a natural gas chamber monitoring device 28 located in the natural gas chamber.

[0136] In a specific embodiment, the implementation of the present invention includes the following steps:

[0137] Step 1, such as Figure 1 As shown, first, holes are drilled on the furnace walls on both sides of each pair of sub-furnaces, and the online gas composition detection device 1 is installed according to the equipment requirements. The signal is transmitted to the combustion optimization controller 3 and the combustion control subsystem 4 (specifically, the DCS system). The transmitted signal needs to be analyzed and indicated and participate in feedback control; secondly, holes are drilled in the main flue to install the zirconium oxide oxygen analyzer 21, and the signal is transmitted to the DCS. The transmitted signal needs to be analyzed and indicated and an over-limit alarm is issued, but it does not participate in feedback control.

[0138] Step 2: Follow the steps below Figure 3 As shown, the construction workers installed the industrial TV 23 on the rear gable wall in place, and observed the burning state of the flame inside the melting furnace through the holes in the rear gable wall, focusing on the following three points: stability, such as whether there is floating or flameout; brightness, such as whether it is clear and powerful, without stratification or floating; speed, such as whether it maintains a certain rigidity.

[0139] In order to better observe the burning state of the flame, the rear gable industrial TV 23 needs to use a color camera and an automatic lens advance and retreat device. In addition, since the ambient temperature at the rear gable is 100°C or above, stainless steel cooling water, gas protection sleeves, cooling water, and gas pipes are also required to ensure the reliable use of the rear gable industrial TV 23.

[0140] Step 3: After the equipment is installed, it enters the debugging stage. First, manual rough adjustment is performed. The debugging objects are mainly two parts, the combustion-supporting air subsystem 6 and the natural gas subsystem 5. The parameter settings of the combustion-supporting air subsystem 6 include:

[0141] 1) The combustion-supporting air volume and natural gas volume of the sub-furnace are adjusted proportionally.

[0142] 2) During the fire change period, the air volume is increased by 0-20%. At this time, the output frequency of the combustion-supporting fan 61 and the opening of the flue regulating damper should be at a certain preset value.

[0143] 3) The combustion-supporting air of the sub-furnace is provided with a regulating valve and a flow meter 515. The combustion-supporting air flow rates on the two sides of the kiln can have different set values ​​and can be switched when changing the fire to maintain stability.

[0144] 4) The fuel and air ratio setting values ​​are set manually based on the exhaust gas detection results.

[0145] Natural gas system parameter settings include:

[0146] 1) The natural gas system and the combustion-supporting air system are interlocked. When the pressure of the entire combustion-supporting air system is low or the natural gas pressure is low, close the safety shut-off valve of the natural gas main.

[0147] 2) Natural gas is controlled at a fixed value. The natural gas flow on the two sides of the kiln can have different set values, which can be switched when the fire is changed to maintain stability.

[0148] The ultimate goals of manual coarse adjustment are roughly three aspects:

[0149] 1) The combustion temperature must meet the process requirements, such as the furnace temperature reaching 1600°C. The combustion must be stable and the temperature fluctuation must be within an acceptable range.

[0150] 2) The combustion state of the flame meets the requirements, that is: no stratification, no floating, and a certain rigidity.

[0151] 3) The residual oxygen content displayed by the zirconium oxide oxygen analyzer 21 is within an acceptable range, and the exhaust gas volume is moderate, meeting environmental protection requirements.

[0152] The debugging of the above three aspects requires past manual experience, and the observation of the combustion state of the flame is subjective. Therefore, although the final debugging result can meet the production requirements, it cannot be accurate. After debugging, although the handheld oxygen analyzer 22 can be used to detect the residual oxygen in the branch flue of each pair of sub-furnaces to verify the rationality of the debugging results, the lag of data feedback is large. If you want to further improve the combustion efficiency and reduce carbon monoxide emissions, finding a better fuel / air ratio is the key to solving the problem.

[0153] Step 4, after completing the manual rough adjustment in step 3, the on-site technicians can use the in-furnace laser online gas composition detection device 1, combined with the combustion optimization controller 3 and the combustion control subsystem 4 of model FOCS8000, to further fine-tune, such as Figure 2 As shown. Combined Figure 1 and Figure 2 During the fine-tuning process, the technicians should use the online gas composition detection device 1 to synchronously detect the residual oxygen and carbon monoxide of each pair of sub-furnaces during the combustion process in real time, and feed the data back to the combustion optimization controller 3 for optimization control calculation. Finally, the dynamic fuel / air ratio is output to the combustion control subsystem 4, and the combustion-supporting air flow set value is calculated. After the set value is cross-limited with the current gas flow, the actual air flow set value is output.

[0154] Step 5: After completing the above operations, the debugger can Figure 8 , Fig. 9Process, test run the combustion system fire-changing program several times, observe whether the control actions of the combustion-supporting air subsystem 6 and the natural gas subsystem 5 match, mainly observe the operation of the following equipment, including: combustion-supporting fan 61, air exchange machine, regulating valves in various places, shut-off valve 64, etc., combined with the fire-changing program, further observe: whether the parameter settings are reasonable, and whether the residual oxygen and carbon monoxide detection results meet the expected goals.

[0155] If the fire-changing program runs normally and the combustion efficiency and carbon monoxide emissions reach the expected targets, the debugging can be completed.

[0156] The present invention designs a new and practical carbon-saving combustion control system for a glass factory melting furnace, including an online detection control system and an offline detection control system. The two control modes can back up each other, the offline detection control system sets a rough adjustment, and the online detection control system sets a fine adjustment. This patent improves the intelligence and reliability of the combustion system, and improves the combustion rate of the glass melting furnace 2, saving fuel while reducing carbon monoxide emissions, achieving the purpose of energy conservation and emission reduction.

[0157] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent carbon-saving combustion control system for a glass factory melting furnace, characterized in that: include, An online gas composition detection device (1) is respectively arranged in the furnace cavities of a plurality of sub-furnaces on both sides of a glass melting furnace (2), and is used to detect the gas composition during the combustion process of the sub-furnaces and output a gas composition detection signal; A combustion optimization controller (3) connected to the online gas composition detection device (1) and used to perform optimization control calculation according to the gas composition detection signal to generate a dynamic fuel-air ratio; A combustion control subsystem (4), connected to the combustion optimization controller (3), for generating a natural gas flow signal and a combustion-supporting air flow signal according to the dynamic fuel-air ratio; A natural gas subsystem (5), connected to the sub-furnace, and used to adjustably introduce natural gas into the sub-furnace according to the natural gas flow signal; A combustion-supporting air subsystem (6) is connected to the sub-furnace and is used to adjustably introduce combustion-supporting air into the sub-furnace according to the combustion-supporting air flow signal.

2. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 1 is characterized in that: The natural gas subsystem (5) comprises a natural gas fine-tuning module, and the natural gas fine-tuning module comprises a plurality of natural gas fine-tuning mechanisms (51) respectively connected to the sub-furnaces, and each of the natural gas fine-tuning mechanisms (51) has the same structure, including: A first solenoid valve (511) is disposed on the compressed air intake pipeline and can controllably feed compressed air into the natural gas fine-tuning mechanism (51); A pneumatic valve (512), wherein the inlet of the pneumatic valve (512) is connected to the natural gas supply end (57), the outlet of the pneumatic valve (512) is connected to the sub-furnace, and the driving end of the pneumatic valve (512) is connected to the outlet of the first solenoid valve (511), and can controllably deliver a set flow of natural gas to the sub-furnace according to the supplied compressed air; A flow control device (513) is provided on the connecting pipeline between the pneumatic valve (512) and the natural gas supply end (57), and is used to obtain the natural gas flow value passing through the pneumatic valve (512), and output a first control signal to the first solenoid valve (511) to adjust the flow of compressed air based on the comparison result of the obtained natural gas flow value and the natural gas flow signal, so as to control the opening of the pneumatic valve (512) and adjust the flow of natural gas.

3. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 2 is characterized in that: The flow control device (513) comprises: A flow sensor (514) is provided on the connecting pipeline between the pneumatic valve (512) and the natural gas supply end (57) to obtain a natural gas flow sensing signal; A flow meter (515), connected to the flow probe (514), for calculating the flow value of the natural gas according to the natural gas flow sensing signal; A natural gas flow control unit (516) is connected to the flow meter (515), and an output end of the natural gas flow control unit (516) is connected to the first solenoid valve (511), and is used to output the first control signal to the first solenoid valve (511) according to the natural gas flow value passing through the pneumatic valve (512).

4. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 2 is characterized in that: The natural gas subsystem (5) further comprises a natural gas rough adjustment module, wherein the natural gas rough adjustment module comprises: A main solenoid valve (521) is arranged on the compressed air intake pipeline and can controllably supply compressed air to the natural gas rough adjustment module; A main pneumatic valve (522), wherein the inlet of the main pneumatic valve (522) is connected to the natural gas initial supply end (58), the outlet of the main pneumatic valve (522) is connected to the natural gas fine-tuning module as the natural gas supply end (57), and the driving end of the main pneumatic valve (522) is connected to the outlet of the solenoid valve, and can controllably deliver a preset flow of natural gas to the natural gas fine-tuning module according to the supplied compressed air; A total flow calculation device (523) is provided on the pipeline between the pneumatic valve (512) and the natural gas initial supply end (58), and is used to obtain the natural gas flow value passing through the total pneumatic valve (522).

5. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 4 is characterized in that: The natural gas rough adjustment module also includes a pressure control device, and the pressure control device includes: A pressure probe (541), disposed at the outlet of the main pneumatic valve (522), and used for obtaining a pressure detection signal at the outlet of the main pneumatic valve (522); A pressure transmitter unit (542), connected to the pressure probe (541), and used to calculate the pressure value at the outlet of the main pneumatic valve (522) according to the pressure detection signal; A pressure regulating unit (543) is connected to the pressure transmitting unit (542) to receive a pressure value. The output end of the pressure regulating unit (543) is connected to the main solenoid valve (521) and is used to output a second control signal to the main solenoid valve (521) based on the pressure value at the outlet of the main pneumatic valve (522) to regulate the flow of compressed air so as to control the opening of the main pneumatic valve (522) and regulate the flow of natural gas.

6. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 4 is characterized in that: The natural gas rough adjustment module also includes: A total shutoff valve (525) is provided on the pipeline between the total flow calculation device (523) and the natural gas initial supply end (58); A first time control unit (551) is disposed on a compressed air intake pipeline and connected to the main shutoff valve (525), and can controllably deliver compressed air to the main shutoff valve (525) for driving the main shutoff valve (525); The first in-position switch (552) and the second in-position switch (553) are connected to the main shutoff valve (525) and are used to detect the opening position of the main shutoff valve (525).

7. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 1 is characterized in that: The combustion-supporting air subsystem (6) comprises: A combustion-supporting air fan (61), used for providing combustion-supporting air to a combustion-supporting air delivery pipeline; a second solenoid valve (62), wherein an inlet of the second solenoid valve (62) is connected to the combustion-supporting air delivery pipeline, and an outlet of the second solenoid valve (62) is connected to the sub-furnace; A combustion-supporting air flow control unit (63) is connected to the combustion control subsystem (4) to receive the combustion-supporting air flow signal. The control end of the combustion-supporting air flow control unit (63) is connected to the second solenoid valve (62) and is used to output a third control signal to the second solenoid valve (62) according to the combustion-supporting air flow signal, thereby controlling the opening of the second solenoid valve (62) to adjust the combustion-supporting air flow delivered to the sub-furnace.

8. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 7 is characterized in that: The combustion-supporting air subsystem (6) further comprises: A pressure sensing device (66), arranged on the combustion-supporting air delivery pipeline, for obtaining pressure data of the combustion-supporting air delivery pipeline; A temperature sensing device (67), arranged on the combustion-supporting air delivery pipeline, for acquiring temperature data of the combustion-supporting air delivery pipeline; A flow sensing device (68), arranged on the combustion-supporting air delivery pipeline, for obtaining flow data of the combustion-supporting air delivery pipeline; The shut-off valve (64) comprises a first-side shut-off valve (641) provided on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the first side and the combustion-supporting air fan (61), and a second-side shut-off valve (642) provided on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the second side and the combustion-supporting air fan (61); A second time control unit (643), connected to the cut-off valve (64), and used to control the opening or closing of the cut-off valve (64); A third in-position switch (644) and a fourth in-position switch (645), connected to the first side shutoff valve (641), for detecting the opening position of the first side shutoff valve (641); A fifth in-position switch (646) and a sixth in-position switch (647), connected to the second side shutoff valve (642), for detecting the opening position of the second side shutoff valve (642); A gas cut-off alarm device (65) is used to detect the combustion-supporting air in the combustion-supporting air delivery pipeline and to issue an alarm when the combustion-supporting air is not detected. The gas cut-off alarm device (65) comprises a first-side gas cut-off alarm device (65) on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the first side and the combustion-supporting air fan (61) and a second-side gas cut-off alarm device (65) on the combustion-supporting air delivery pipeline between the inlet of the sub-furnace on the second side and the combustion-supporting air fan (61).

9. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 1 is characterized in that: The online gas composition detection device (1) comprises: The gas component detection probes (11) are respectively arranged in the furnace cavity of the sub-furnace and are used to detect the carbon monoxide and oxygen content and generate gas component sensing signals. A gas composition transmission unit (12), connected to the gas composition detection probe (11), and configured to output the gas composition detection signal according to the gas composition sensing signal; A gas composition alarm unit (13) is connected to the gas composition transmission unit (12) and is used to analyze the gas composition detection signal and issue an alarm according to the analysis result.

10. The carbon-saving combustion intelligent control system for a glass factory melting furnace according to claim 1, characterized in that: Also includes, An oxygen analyzer, used to collect residual oxygen content in the main flue of the glass melting furnace (2) and the branch flues of the sub-furnaces; The rear gable industrial television (23) is arranged on the rear gable of the glass melting furnace (2) and is used to observe the burning state of the flame inside the glass melting furnace (2) through the hole in the rear gable.

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