Kiln structure for oxygen-fuel combustion and control method thereof

Abstract

The invention discloses a kiln structure for oxygen-fuel combustion and a control method of the kiln structure, and relates to the technical field of glass manufacturing equipment.The kiln structure is characterized in that a natural gas main path is provided with a collecting mechanism and a pressure reducing valve which correspond to each other, and the natural gas main path is communicated with one end of a natural gas inlet branch; the oxygen main path is provided with a collecting mechanism and a pressure reducing valve which correspond to each other, and the oxygen main path is communicated with one end, communicated with the oxygen inlet branch, of the oxygen inlet branch; one end, deviating from the natural gas main path, of the natural gas inlet branch and one end, deviating from the oxygen main path, of the oxygen inlet branch are respectively communicated with the total oxygen burner; the technical problem that in the prior art, due to the fact that flow data measurement is not accurate, a gas flow target value needs to be manually and frequently corrected is solved, and the technical effects of improving production efficiency and reducing labor intensity are achieved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of glass manufacturing equipment, and in particular to a kiln structure for full oxygen combustion and a control method thereof. Background Art

[0002] Full oxygen combustion refers to the use of industrial oxygen instead of air to burn fuel, which can make the fuel burn more completely; full oxygen combustion has many advantages over air combustion: compared with air combustion, about 79% of the nitrogen in the air no longer participates in the combustion process, which can increase the flame temperature, there is no nitrogen in the flue gas, and the combustion products are triatomic products. The heat transfer effect of triatomic substances is higher than that of diatomic substances, which improves the heating efficiency; and nitrogen no longer participates in smoke exhaust, which can greatly reduce the amount of smoke and reduce exhaust heat loss.

[0003] In the prior art, untreated oxygen and natural gas are usually directly connected to the oxy-fuel burner, and a valve group including a gas mass flow meter and a proportional throttling valve is used to control the flow of natural gas and oxygen under the action of a control unit; the natural gas and oxygen flows are detected in real time by the gas mass flow meter, and the detection results are fed back to the control unit, and then the corresponding proportional throttling valve is adjusted to keep the flow of natural gas and oxygen within the set range.

[0004] However, practice has shown that the measurement accuracy of the gas mass flow meter using the above technical solution is affected by the pressure and temperature changes of the measuring medium, the flow rate fed back to the control unit deviates from the actual value, and the combustion process is often affected by changes in process environmental factors, which ultimately causes the melting process to deviate from the target process. It is necessary to manually correct the gas flow target value frequently to return the melting process to the normal range. Summary of the invention

[0005] A technical problem to be solved by the present disclosure is: how to improve the measurement accuracy of the gas mass flow meter during the oxyfuel combustion process and reduce the labor intensity of frequent manual adjustments.

[0006] In order to solve the above technical problems, the present disclosure provides a kiln structure for oxyfuel combustion, comprising:

[0007] A combustion main disk unit, the combustion main disk unit comprising a natural gas main path and an oxygen main path;

[0008] A combustion sub-disc unit, wherein the combustion sub-disc comprises a plurality of combustion generating parts; the combustion generating parts comprise a natural gas intake branch, an oxygen intake branch and a full oxygen burner;

[0009] An electric control unit, a plurality of data collection mechanisms and a plurality of pressure reducing valves; the electric control unit controls the opening and closing of the plurality of pressure reducing valves respectively according to the data collected by the data collection mechanism;

[0010] Wherein, the natural gas main line is provided with the corresponding collection mechanism and the pressure reducing valve, and the natural gas main line is connected with one end of the natural gas intake branch line;

[0011] The oxygen main path is provided with the corresponding collection mechanism and the pressure reducing valve, and the oxygen main path is connected to one end of the oxygen intake branch path;

[0012] One end of the natural gas intake branch away from the natural gas main road and one end of the oxygen intake branch away from the oxygen main road are respectively connected to the oxy-fuel burner.

[0013] In some embodiments, the collection mechanism includes a pressure sensor, a temperature sensor, a pressure gauge and a flow meter, and the electrical control unit is electrically connected to the pressure sensor, the temperature sensor, the pressure gauge and the flow meter respectively.

[0014] In some embodiments, the oxygen main path includes valve bodies disposed at both ends of the oxygen main path, and a first collecting part, a first filtering part, a first regulating part and a first safety cutting part disposed between the two valve bodies and connected in sequence;

[0015] The first collecting unit includes a pressure sensor, a temperature sensor and a pressure gauge that are connected;

[0016] The first filter unit includes a filter and a pressure reducing valve which are connected in sequence;

[0017] The first regulating part includes a pressure gauge, a flow meter and a low pressure switch which are connected in sequence;

[0018] The first safety cut-off part is used for the electrical control unit to control the on-off of the pipeline according to the pressure data and temperature data of the oxygen in the pipeline.

[0019] In some embodiments, the natural gas main path includes valve bodies disposed at both ends of the natural gas main path, and a second collecting portion, a second filtering portion, a second regulating portion, and a second safety cutting portion disposed between the two valve bodies and connected in sequence;

[0020] The second collecting unit includes a pressure sensor, a temperature sensor and a pressure gauge that are connected;

[0021] The second filter unit includes a filter and a pressure reducing valve which are connected in sequence;

[0022] The second regulating part includes a pressure gauge, a flow meter and a low pressure switch which are connected in sequence;

[0023] The second safety cut-off part is used by the electrical control component to control the on-off of the pipeline according to the pressure data and temperature data of the natural gas in the pipeline.

[0024] In some embodiments, the natural gas intake branch includes the valve body, a first artificial branch and a first automatic control branch; the valve body is located at the inlet side of the natural gas intake branch; the first artificial branch and the first automatic control branch are connected in parallel;

[0025] The first artificial branch includes a first manual regulating valve and a first float flowmeter which are connected in sequence;

[0026] The first automatic control branch includes a first mass flow meter and a flow regulating valve which are connected in sequence.

[0027] In some embodiments, the oxygen intake branch includes the valve body, a second artificial branch and a second automatic control branch; the valve body is located at the inlet side of the natural gas intake branch; the second artificial branch and the second automatic control branch are connected in parallel;

[0028] The second artificial branch includes a second manual regulating valve and a second float flowmeter which are connected in sequence;

[0029] The second automatic control branch includes a second mass flow meter and a flow regulating valve connected in sequence;

[0030] A one-way valve is also provided at the outlet of the oxygen intake branch.

[0031] In some embodiments, the first collecting part, the second collecting part, the first filtering part, the second filtering part, the first regulating part, the second regulating part, the first safety cutting part and the second safety cutting part are all provided with spare pipelines which are respectively connected in parallel therewith and have the same structure.

[0032] In some embodiments, the second mass flow meter and the third mass flow meter are connected to the oxyfuel burner through the front-gun pipeline respectively;

[0033] The front pipeline of the gun includes a shell, refractory bricks, a gun body, a nozzle, a gasket and a bracket, the second mass flow meter and the third mass flow meter are respectively connected through the gun body, and the gas is sprayed into the refractory bricks through the nozzle provided on the gun body;

[0034] The gun body is arranged in the shell, and the shell is connected to the refractory bricks through the bracket;

[0035] A gasket is provided between the shell and the bracket.

[0036] In some embodiments, a cooling mechanism is further included, wherein the cooling mechanism is connected to the oxy-fuel burner;

[0037] The cooling mechanism comprises a third filter, an overpressure relief valve, a pressure gauge, a pressure switch and a solenoid valve which are sequentially connected from the pipeline inlet; the solenoid valve is connected to the oxyfuel burner;

[0038] The third filter part includes a valve body, a filter and a pressure reducing valve which are connected in sequence.

[0039] In a second aspect, the present invention further provides a control method for controlling the above-mentioned kiln structure for oxyfuel combustion, comprising the following steps:

[0040] S10. The oxygen enters the oxygen main path of the main disk unit through the opening of the valve body. After the pressure sensor and the temperature sensor in the first acquisition part collect oxygen data, the data is transmitted to the electronic control unit. When the data meets the requirements, the electronic control unit opens the first filter unit for filtering and decompression, and transmits the oxygen to the flow meter in the first regulating unit for oxygen flow measurement, and then transmits it to the oxygen intake branch.

[0041] The natural gas enters the natural gas main path of the main disk unit through the opening of the valve body. After the pressure sensor and the temperature sensor in the second acquisition part collect oxygen data, the data is transmitted to the electronic control part. When the data meets the requirements, the electronic control part opens the second filter part for filtering and decompression, and transmits the natural gas to the flow meter in the second regulating part for natural gas flow measurement, and then transmits it to the natural gas intake branch.

[0042] S20. After the oxygen enters the oxygen intake branch, the data is secondary confirmed and the oxygen flow is measured, and then the oxygen is transferred to the oxy-fuel burner;

[0043] After the natural gas enters the natural gas intake branch, it is transferred to the oxy-fuel burner after secondary data confirmation and natural gas flow measurement.

[0044] Through the above technical scheme, in the kiln structure for full oxygen combustion provided by the present invention, multiple burners can be connected in parallel through the arrangement of the combustion main disk unit and the combustion sub-disk unit to improve production efficiency; in order to keep oxygen and natural gas at a suitable temperature and pressure during the production process, a natural gas main path and an oxygen main path are arranged in the combustion main disk unit as pretreatment of the incoming gas, and relevant information is collected by a collection mechanism, and the electric control unit controls the opening and closing ratio of the pressure reducing valve of the oxygen main path or the natural gas main path according to the collected information. When the oxygen and natural gas meet the standards, the required gas is delivered to the full oxygen burner through the natural gas intake branch and the oxygen intake branch respectively, thereby avoiding the technical problem in the prior art that the gas flow target value needs to be frequently corrected manually, thereby achieving the technical effect of improving production efficiency and reducing labor intensity.

[0045] In a second aspect, the present invention further provides a control method for the kiln structure for full oxygen combustion described above, the principle of which has been described above and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 It is a schematic diagram of the principle of the kiln structure for full oxygen combustion disclosed in the embodiment of the present disclosure;

[0048] Figure 2 It is a structural schematic diagram of a kiln structure for oxyfuel combustion disclosed in an embodiment of the present disclosure;

[0049] Figure 3 It is a structural schematic diagram of a natural gas main path in a kiln structure for full oxygen combustion disclosed in an embodiment of the present disclosure;

[0050] Figure 4 It is a schematic diagram of the principle structure of the main oxygen path in the kiln structure for full oxygen combustion disclosed in the embodiment of the present disclosure;

[0051] Figure 5 It is a schematic diagram of a cooling mechanism in a kiln structure for oxy-fuel combustion disclosed in an embodiment of the present disclosure;

[0052] Figure 6 It is a structural schematic diagram of the front gun pipeline in the kiln structure for full oxygen combustion disclosed in the embodiment of the present disclosure.

[0053] Description of reference numerals:

[0054] 1- Pressure reducing valve; 2- Spare pipeline

[0055] 10-pressure sensor; 20-temperature sensor; 30-pressure gauge; 40-flow meter; 50-valve body; 60-low pressure switch; 70-filter; 80-flow regulating valve; 90-check valve;

[0056] 100 - natural gas main line; 110 - second collection unit; 120 - second filtering unit; 130 - second regulating unit; 140 - second safety cutting unit;

[0057] 200- oxygen main circuit; 210- first collection unit; 220- first filter unit; 230- first adjustment unit; 240- first safety cut-off unit;

[0058] 300-natural gas intake branch; 310-first artificial branch; 311-first manual regulating valve; 312-first float flowmeter; 320-first automatic control branch; 321-first mass flowmeter;

[0059] 400- oxygen intake branch; 410- second manual branch; 411- second manual regulating valve; 412- second float flowmeter; 420- second automatic control branch; 421- second mass flowmeter;

[0060] 500-oxygen burner;

[0061] 600 - cooling mechanism; 610 - third filter unit; 620 - overpressure relief valve; 630 - pressure switch; 640 - solenoid valve.

[0062] 700-front pipe of the gun; 710-shell; 720-refractory brick; 730-gun body; 740-nozzle; 750-gasket; 760-bracket. DETAILED DESCRIPTION

[0063] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0064] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0065] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0066] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0067] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0068] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0069] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0070] The technical route of the present invention is as follows:

[0071] First, by setting up a natural gas main path 100 and an oxygen main path 200, the gas transmitted to the oxy-fuel burner 500 is pre-treated respectively. The pre-treatment method is the cooperation between the collection mechanism, the electric control unit and the plurality of pressure reducing valves 1, so that the natural gas or oxygen reaches the standard temperature and pressure when entering the oxy-fuel burner 500. At the same time, in order to further improve the effect of regulation, corresponding first flowmeters 40 and second flowmeters 40 are also set on the natural gas intake branch 300 and the oxygen intake branch 400 for secondary confirmation to ensure that the oxygen, natural gas and other gases required by the oxy-fuel burner 500 meet the requirements of oxy-fuel combustion.

[0072] Secondly, during the combustion process of the oxy-fuel burner 500, a cooling mechanism 600 is provided to adjust the temperature and pressure in the oxy-fuel burner 500 using oxygen, thereby further ensuring the stability of relevant parameters during the combustion process.

[0073] In addition, the present invention provides corresponding filtering components in the cooling mechanism 600, the oxygen main path 200, and the natural gas main path 100 to remove impurities in the upstream pipeline, ensure gas purity, and further ensure system pressure stability, which is convenient for energy conservation and emission reduction.

[0074] It can be found in practice that when the kiln structure for full oxygen combustion provided by the present invention is used for flow measurement, the temperature tolerance is reduced from the original ±10°C to ±1°C, and the nitrogen and oxygen content is reduced from 300g / m 3 Reduced to 00g / m 3 , and achieved unexpected technical effects.

[0075] Embodiment 1

[0076] This embodiment mainly improves the accuracy of the mass flow meter 40 by pre-processing the natural gas and oxygen before entering the oxy-fuel burner 500 and improving gas-related parameters, as follows:

[0077] like Figure 1-2 As shown, this embodiment provides a kiln structure for full oxygen combustion, including:

[0078] A combustion main disk unit, the combustion main disk unit includes a natural gas main path 100 and an oxygen main path 200;

[0079] The combustion sub-disc unit includes a plurality of combustion generating parts; the combustion generating parts include a natural gas intake branch 300, an oxygen intake branch 400 and a full oxygen burner 500;

[0080] An electric control unit, a plurality of data collection mechanisms and a plurality of pressure reducing valves 1; the electric control unit controls the opening and closing of the plurality of pressure reducing valves 1 respectively according to the data collected by the data collection mechanism;

[0081] The natural gas main line 100 is provided with a corresponding collection mechanism and a pressure reducing valve 1, and the natural gas main line 100 is connected to one end of the natural gas intake branch line 300;

[0082] The oxygen main path 200 is provided with a corresponding collection mechanism and a pressure reducing valve 1, and the oxygen main path 200 is connected to one end of the oxygen intake branch 400;

[0083] One end of the natural gas intake branch 300 away from the natural gas main path 100 and one end of the oxygen intake branch 400 away from the oxygen main path 200 are respectively connected to the oxy-fuel burner 500 .

[0084] Through the above technical scheme, in the kiln structure for full oxygen combustion provided by the present invention, through the setting of the combustion main disk unit and the combustion sub-disk unit, multiple burners can be connected in parallel to improve production efficiency; in order to keep oxygen and natural gas at a suitable temperature and pressure during the production process, a natural gas main path 100 and an oxygen main path 200 are set in the combustion main disk unit as pretreatment of the incoming gas, and the relevant information is collected by the collection mechanism. The electric control unit controls the opening and closing ratio of the pressure reducing valve 1 of the oxygen main path 200 or the natural gas main path 100 according to the collected information. When the oxygen and natural gas meet the standards, the required gas is delivered to the full oxygen burner 500 through the natural gas intake branch 300 and the oxygen intake branch 400 respectively, thereby avoiding the technical problem in the prior art that the gas flow target value needs to be manually corrected frequently, thereby achieving the technical effect of improving production efficiency and reducing labor intensity.

[0085] Furthermore, the data collection mechanism includes a pressure sensor 10, a temperature sensor 20, a pressure gauge 30 and a flow meter 40, and the electrical control components are electrically connected to the pressure sensor 10, the temperature sensor 20, the pressure gauge 30 and the flow meter 40 respectively.

[0086] It should be noted that the system consisting of the electric control unit, the data collection mechanism and the pressure reducing valve 1 in the structure integrates the switch and control functions of the burner control, the data collection and processing functions. All systems transmit error signals to the operating system through the bus. The necessary switching and display functions (hardware and touch screen) are integrated in the front operation panel. General operation and parameter setting are completed through the touch control panel, and the system process diagram is integrated. All alarm texts will be clearly displayed and saved in the historical loop buffer. If necessary, the existing system communication interface can be defined, which can be realized through Profibus DP (DP / DP coupler) or PROFINET.

[0087] Furthermore, if Figure 3 As shown, the oxygen main path 200 includes valve bodies 50 disposed at both ends of the oxygen main path 200, and a first collecting part 210, a first filtering part 220, a first regulating part 230 and a first safety cutting part 240 disposed between the two valve bodies 50 and connected in sequence;

[0088] The first collecting unit 210 includes a pressure sensor 10, a temperature sensor 20 and a pressure gauge 30 which are connected to each other;

[0089] The first filter unit 220 includes a filter 70 and a pressure reducing valve 1 which are connected in sequence;

[0090] The first regulating part 230 includes a pressure gauge 30, a flow meter 40 and a low pressure switch 60 which are connected in sequence;

[0091] The first safety cut-off unit 240 is used for the electronic control unit to control the on-off of the pipeline according to the pressure data and temperature data of the oxygen in the pipeline.

[0092] After oxygen enters the combustion main disk unit, it first passes through the valve body 50, the pressure sensor 10 and the temperature sensor 20 to measure the initial value, and then passes through the filter 70 to remove impurities in the upstream pipeline. This arrangement ensures the overall pressure stability of the system and is more convenient for adjustment. The electronic control unit is depressurized once through the pressure reducing valve 1 according to the initial value, and then enters the flow meter for verification. It should be noted that the flow meter 40 uses an orifice flow meter 40 to further ensure the accurate measurement of the flow. When the measurement meets the standard, the oxygen is transferred to the oxygen intake branch 400 through the low-pressure switch 60. When the measurement does not meet the standard, it is cut off through the cut-off valve in the first safety cut-off part 240. In this pipeline structure, low-pressure switches 60 and high-pressure switches are configured before and after to better protect the equipment and improve safety.

[0093] It should be noted that the valve body 50 may be a ball valve, a straight valve or any other valve with on-off and electrical connection functions.

[0094] Furthermore, if Figure 4 As shown, the natural gas main path 100 includes valve bodies 50 disposed at both ends of the natural gas main path 100, and a second collecting part 110, a second filtering part 120, a second regulating part 130 and a second safety cutting part 140 disposed between the two valve bodies 50 and connected in sequence;

[0095] The second collecting unit 110 includes a pressure sensor 10, a temperature sensor 20 and a pressure gauge 30 which are connected to each other;

[0096] The second filter unit 120 includes a filter 70 and a pressure reducing valve 1 which are connected in sequence;

[0097] The second regulating unit 130 includes a pressure gauge 30, a flow meter 40 and a low pressure switch 60 which are connected in sequence;

[0098] The second safety cut-off unit 140 is used for the electronic control unit to control the on-off of the pipeline according to the pressure data and temperature data of the natural gas in the pipeline.

[0099] After the natural gas enters the combustion main disk unit, it first passes through the valve body 50, the pressure sensor 10 and the temperature sensor 20 to measure the initial value, and then passes through the filter 70 to remove impurities in the upstream pipeline. This arrangement ensures the overall pressure stability of the system and is more convenient for adjustment. The electronic control unit is depressurized once through the pressure reducing valve 1 according to the initial value, and then enters the flow meter for verification. It should be noted that the flow meter 40 uses an orifice flow meter 40 to further ensure the accurate measurement of the flow. When the measurement meets the standard, the natural gas is transmitted to the natural gas intake branch 300 through the low-pressure switch 60. When the measurement does not meet the standard, it is cut off by the cut-off valve in the first safety cut-off part 240. In this pipeline structure, low-pressure switches 60 and high-pressure switches are configured before and after to better protect the equipment and improve safety.

[0100] In addition, the combustion main panel unit is equipped with oxygen and natural gas pressure switches 630 and safety shut-off valves, and is equipped with a special safety interlock control panel to monitor the status of local safety devices, as well as remote equipment, central control room instructions, emergency stop and other interlocking conditions, and is supplemented by light alarms to ensure the combustion safety of the system and kiln. When the system is safely shut off, it must be restarted manually.

[0101] The above is the regulation of oxygen and natural gas in the combustion main disk unit. In order to facilitate the control of multiple oxyfuel burners 500, in this embodiment, the combustion sub-disk unit includes multiple combustion generating parts, that is, through the form of natural air intake branch and oxygen air intake branch 400N+N, respectively controlling a total of N pairs of 2N oxyfuel burners 500 installed in the kiln. Each burner has its own independent natural gas / oxygen control branch pipeline on the front flow control disk of the gun, which includes a flow measurement unit and a flow control unit to achieve precise control of the flow of a single gun; a bypass is provided to facilitate manual reduction in the event of an automatic reduction failure.

[0102] It should be noted that the minimum value of the N value of the oxy-fuel burner 500 is 8 and the maximum value is 30. Similarly, the minimum value of the N value in 2N of the front gun assembly is 8 and the maximum value is 30.

[0103] Furthermore, if Figure 2 As shown, the natural gas main path 100 includes valve bodies 50 disposed at both ends of the natural gas main path 100, and a second collecting part 110, a second filtering part 120, a second regulating part 130 and a second safety cutting part 140 disposed between the two valve bodies 50 and connected in sequence;

[0104] The second collecting unit 110 includes a pressure sensor 10, a temperature sensor 20 and a pressure gauge 30 which are connected to each other;

[0105] The second filter unit 120 includes a filter 70 and a pressure reducing valve 1 which are connected in sequence;

[0106] The second regulating unit 130 includes a pressure gauge 30, a flow meter 40 and a low pressure switch 60 which are connected in sequence;

[0107] The second safety cut-off unit 140 is used for the electronic control unit to control the on-off of the pipeline according to the pressure data and temperature data of the natural gas in the pipeline.

[0108] Further, the natural gas intake branch includes a valve body 50, a first artificial branch 310 and a first automatic control branch 320; the valve body 50 is located at the inlet side of the natural gas intake branch; the first artificial branch 310 and the first automatic control branch 320 are connected in parallel;

[0109] The first artificial branch 310 includes a first manual regulating valve 311 and a first float flowmeter 312 which are connected in sequence;

[0110] The first automatic control branch 320 includes a first mass flow meter 321 and a flow regulating valve which are connected in sequence.

[0111] Further, the oxygen intake branch 400 includes a valve body 50, a second artificial branch 410 and a second automatic control branch 420; the valve body 50 is located at the inlet side of the natural gas intake branch 300; the second artificial branch 410 and the second automatic control branch 420 are connected in parallel;

[0112] The second artificial branch 410 includes a second manual regulating valve 411 and a second float flowmeter 41240 which are connected in sequence;

[0113] The second automatic control branch 420 includes a second mass flow meter 42140 and a flow regulating valve 80 which are connected in sequence;

[0114] A one-way valve 90 is also provided at the outlet of the oxygen inlet branch 400 .

[0115] After the pressure and temperature of the oxygen main line 200 and the natural gas main line 100 are adjusted respectively, the oxygen and natural gas are connected to the oxy-fuel burner 500 through the oxygen intake branch line 400 and the natural gas intake branch line 300 respectively, and are mixed in the oxy-fuel burner 500 to provide a combustion environment. At this time, the oxygen intake branch line 400 and the natural gas intake branch line 300 are required to have the functions of secondary verification and secondary adjustment so that the transmitted gas meets the combustion requirements in the oxy-fuel burner 500.

[0116] The specific process is as follows:

[0117] After oxygen enters the combustion disk unit, it first passes through the valve body 50, and then enters the parallel passage composed of the second artificial branch 410 and the second automatic control branch 420. The purpose of setting the parallel passage is to ensure that when the second automatic control branch 420 transmits gas, in the event of a power outage, the second artificial branch 410 can be used as a backup passage. Secondly, it is more accurate to adjust the flow of natural gas manually, which is suitable for working conditions with higher requirements. For situations where automatic control is required, the second automatic control branch 420 only needs to be controlled by an electrical control component, thereby reducing the labor intensity of the staff.

[0118] The second artificial branch 410 includes a second manual regulating valve 411 and a second float flowmeter 41240 which are connected in sequence; the float flowmeter 40 has low requirements for upstream and downstream straight pipe sections, and has a large flow range of upper and lower limits, making its installation and use more flexible.

[0119] The second automatic control branch 420 includes a second mass flow meter 42140 and a flow regulating valve 80 which are connected in sequence;

[0120] The electric control unit is electrically connected to the second mass flow meter 42140 and the regulating valve respectively, and controls the opening and closing of the regulating valve according to the flow data measured by the second mass flow meter 42140 and the data of the relevant pressure gauge 30.

[0121] The principles of secondary regulation and secondary verification of natural gas are similar to the working process of the oxygen intake branch 400 described above, and will not be repeated here.

[0122] It should also be noted that, since the pressure of oxygen is lower than that of natural gas, a one-way valve 90 is also provided at the outlet of the oxygen inlet branch 400 to reduce safety hazards.

[0123] Furthermore, the first collecting part 210, the second collecting part 110, the first filtering part 220, the second filtering part 120, the first regulating part 230, the second regulating part 130, the first safety cutting part 240 and the second safety cutting part 140 are all provided with spare pipelines 2 respectively connected in parallel therewith and having the same structure.

[0124] The provision of the backup pipeline 2 further improves the reliability of the equipment.

[0125] Furthermore, if Figure 6 As shown, the second mass flow meter 42140 and the third mass flow meter are connected to the oxyfuel burner 500 through the front-gun pipeline 700 respectively;

[0126] The front-gun pipeline 700 includes a shell 710, refractory bricks 720, a gun body 730, a nozzle 740, a gasket 750 and a bracket 760. The second mass flow meter 42140 and the third mass flow meter 40 are respectively connected through the gun body 730, and the gas is sprayed into the refractory bricks 720 through the nozzle 740 provided in the gun body 730; the function of the nozzle 740 can further control the spraying speed and flow rate. The gun body 730 is provided in the shell 710, and the shell 710 is connected to the refractory bricks 720 through the bracket 760; a gasket 750 is provided between the shell 710 and the bracket 760 to achieve the sealing of the overall structure.

[0127] Embodiment 2

[0128] This embodiment is aimed at adjusting the pressure during the glass firing process, so that the value measured by the flow meter 40 can be more accurate, specifically:

[0129] like Figure 5 As shown, it also includes a cooling mechanism 600, and the cooling mechanism 600 is connected to the oxyfuel burner 500;

[0130] The cooling mechanism 600 includes a third filter 610, an overpressure relief valve 620, a pressure gauge 30, a pressure switch 630 and a solenoid valve 640 which are connected in sequence from the pipeline inlet; the solenoid valve 640 is connected to the oxyfuel burner 500;

[0131] The third filter unit 610 includes a valve body 50 , a filter 70 , and a pressure reducing valve 1 which are connected in sequence.

[0132] It should be noted that the function of the oxygen in the cooling mechanism 600 is to cool down the overall temperature of the oxy-fuel burner 500, which is different from the function of the oxygen delivered by the pipelines mentioned above. The delivery process is as follows:

[0133] Oxygen first passes through the third filter part 610 to remove impurities in the upstream pipeline. In order to ensure the stability of the system pressure and facilitate automatic adjustment, the corresponding pressure reducing valve 1 can be set to reduce the pressure. The filtered and reduced-pressure oxygen passes through the overpressure relief valve 620 to further avoid safety accidents and release excess pressure. Finally, the pressure switch 630 is controlled to open through the electric control unit through the pressure gauge 30, and the solenoid valve 640 is linked to the oxy-fuel burner 500.

[0134] Embodiment 3

[0135] This embodiment provides a control method for the kiln structure for oxyfuel combustion as described above, and the process is as follows:

[0136] S10. The oxygen enters the oxygen main path 200 of the main disk unit through the opening of the valve body 50. After the pressure sensor 10 and the temperature sensor 20 in the first acquisition part 210 collect oxygen data, the data is transmitted to the electronic control unit. When the data meets the requirements, the electronic control unit opens the first filter part 220 for filtering and decompression, and transmits the oxygen to the flow meter 40 in the first adjustment part 230 for oxygen flow meter 40 measurement, and then transmits it to the oxygen intake branch 400;

[0137] The natural gas enters the natural gas main path 100 of the main disk unit through the opening of the valve body 50. After the pressure sensor 10 and the temperature sensor 20 in the second collection part 110 collect oxygen data, the data is transmitted to the electronic control unit. When the data meets the requirements, the electronic control unit opens the second filter part 120 for filtering and decompression, and transmits the natural gas to the flow meter 40 in the second regulating part 130 for natural gas flow meter 40 measurement, and then transmits it to the natural gas intake branch 300;

[0138] S20. After the oxygen enters the oxygen intake branch 400, the data is secondary confirmed with the oxygen flow meter 40 and then transmitted to the oxy-fuel burner 500;

[0139] After the natural gas enters the natural gas inlet branch 300 , the data is secondary confirmed and measured by the natural gas flow meter 40 , and then the natural gas is transmitted to the oxyfuel burner 500 .

[0140] Practice has shown that by using this method, it is possible to achieve precise control of the natural gas and oxygen flow rates during the full oxygen combustion process of a photovoltaic glass kiln, so that the kiln process is stabilized within a normal range; at the same time, an oxygen cooling unit is used as the burner cooling medium, which greatly reduces NOX emissions compared to compressed air cooling, meets national environmental protection requirements, reduces the flue gas denitrification process, and reduces manufacturing costs.

[0141] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0142] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A kiln structure for oxyfuel combustion, characterized in that: include: A combustion main disk unit, the combustion main disk unit comprising a natural gas main path (100) and an oxygen main path (200); A combustion sub-disc unit, wherein the combustion sub-disc comprises a plurality of combustion generating parts; the combustion generating parts comprise a natural gas intake branch (300), an oxygen intake branch (400) and an oxy-fuel burner (500); An electric control unit, a plurality of data collection mechanisms and a plurality of pressure reducing valves (1); the electric control unit controls the opening and closing of the plurality of pressure reducing valves (1) according to the data collected by the data collection mechanism; The natural gas main line (100) is provided with the corresponding collection mechanism and the pressure reducing valve (1), and the natural gas main line (100) is connected to one end of the natural gas intake branch line (300); The oxygen main path (200) is provided with the corresponding collection mechanism and the pressure reducing valve (1), and the oxygen main path (200) is connected to one end of the oxygen intake branch path (400); One end of the natural gas intake branch (300) away from the natural gas main path (100) and one end of the oxygen intake branch (400) away from the oxygen main path (200) are respectively connected to the oxyfuel burner (500).

2. The kiln structure for oxyfuel combustion according to claim 1, characterized in that: The acquisition mechanism comprises a pressure sensor (10), a temperature sensor (20), a pressure gauge (30) and a flow meter (40), and the electrical control unit is electrically connected to the pressure sensor (10), the temperature sensor (20), the pressure gauge (30) and the flow meter (40) respectively.

3. The kiln structure for oxyfuel combustion according to claim 2, characterized in that: The oxygen main path (200) comprises valve bodies (50) arranged at both ends of the oxygen main path (200), and a first collecting part (210), a first filtering part (220), a first regulating part (230) and a first safety cut-off part (240) arranged between the two valve bodies (50) and connected in sequence; The first collecting unit (210) comprises a pressure sensor (10), a temperature sensor (20) and a pressure gauge (30) which are connected to each other; The first filtering part (220) comprises a filter (70) and a pressure reducing valve (1) which are connected in sequence; The first regulating part (230) comprises a pressure gauge (30), a flow meter (40) and a low pressure switch (60) which are connected in sequence; The first safety cut-off part (240) is used by the electrical control unit to control the on-off of the pipeline according to the pressure data and temperature data of the oxygen in the pipeline.

4. The kiln structure for oxyfuel combustion according to claim 2, characterized in that: The natural gas main path (100) comprises valve bodies (50) arranged at both ends of the natural gas main path (100), and a second collecting part (110), a second filtering part (120), a second regulating part (130) and a second safety cut-off part (140) arranged between the two valve bodies (50) and connected in sequence; The second collecting unit (110) comprises a pressure sensor (10), a temperature sensor (20) and a pressure gauge (30) which are connected to each other; The second filtering part (120) comprises a filter (70) and a pressure reducing valve (1) which are connected in sequence; The second regulating part (130) comprises a pressure gauge (30), a flow meter (40) and a low pressure switch (60) which are connected in sequence; The second safety cut-off part (140) is used by the electric control unit to control the on-off of the pipeline according to the pressure data and temperature data of the natural gas in the pipeline.

5. The kiln structure for oxyfuel combustion according to claim 2, characterized in that: The natural gas intake branch (300) comprises the valve body (50), a first artificial branch (310) and a first automatic control branch (320); the valve body (50) is located at the inlet side of the natural gas intake branch (300); the first artificial branch (310) and the first automatic control branch (320) are connected in parallel; The first artificial branch (310) comprises a first manual regulating valve (311) and a first float flowmeter (312) which are connected in sequence; The first automatic control branch (320) comprises a first mass flow meter (321) and a flow regulating valve (80) which are connected in sequence.

6. The kiln structure for oxyfuel combustion according to claim 2, characterized in that: The oxygen intake branch (400) comprises the valve body (50), a second artificial branch (410) and a second automatic control branch (420); the valve body (50) is located at the inlet side of the natural gas intake branch (300); the second artificial branch (410) and the second automatic control branch (420) are connected in parallel; The second artificial branch (410) comprises a second manual regulating valve (411) and a second float flowmeter (412) which are connected in sequence; The second automatic control branch (420) comprises a second mass flow meter (421) and a flow regulating valve (80) which are connected in sequence; A one-way valve (90) is also provided at the outlet of the oxygen intake branch (400).

7. The kiln structure for oxyfuel combustion according to claim 3 or 4, characterized in that: The first collecting part (210), the second collecting part (110), the first filtering part (220), the second filtering part (120), the first regulating part (230), the second regulating part (130), the first safety cutting part (240) and the second safety cutting part (140) are all provided with spare pipelines (2) respectively connected in parallel therewith and having the same structure.

8. The kiln structure for oxyfuel combustion according to claim 5 or 6, characterized in that: The second mass flow meter (421) and the third mass flow meter are respectively connected to the oxyfuel burner (500) through the front-gun pipeline (700); The front-gun pipeline (700) comprises a housing (710), refractory bricks (720), a gun body (730), a nozzle (740), a gasket (750) and a bracket (760); the second mass flow meter (421) and the third mass flow meter (40) are respectively connected through the gun body (730), and the gas is sprayed into the refractory bricks (720) through the nozzle (740) provided on the gun body (730); The gun body (730) is disposed in the housing (710), and the housing (710) is connected to the refractory brick (720) via the bracket (760); A gasket (750) is provided between the housing (710) and the bracket (760).

9. The kiln structure for oxyfuel combustion according to claim 2, characterized in that: It also includes a cooling mechanism (600), wherein the cooling mechanism (600) is connected to the oxyfuel burner (500); The cooling mechanism (600) comprises a third filter (610), an overpressure relief valve (620), a pressure gauge (30), a pressure switch (630) and a solenoid valve (640) which are sequentially connected from the pipeline inlet; the solenoid valve (640) is connected to the oxyfuel burner (500); The third filter unit (610) comprises a valve body (50), a filter (70) and a pressure reducing valve (1) which are connected in sequence.

10. A control method for controlling the kiln structure for oxyfuel combustion according to any one of claims 1 to 9, characterized in that: The steps include: S10. The oxygen enters the oxygen main path (200) of the main disk unit through the opening of the valve body (50). The pressure sensor (10) and the temperature sensor (20) in the first acquisition part (210) collect oxygen data and transmit the data to the electronic control unit. When the data meets the requirements, the electronic control unit opens the first filter part (220) to filter and reduce the pressure, and transmits the oxygen to the flow meter (40) in the first adjustment part (230) to measure the oxygen flow meter (40), and then transmits the oxygen to the oxygen intake branch path (400); The natural gas enters the natural gas main path (100) of the main disk unit through the opening of the valve body (50), and the pressure sensor (10) and the temperature sensor (20) in the second collecting part (110) collect oxygen data and transmit the data to the electronic control unit. When the data meets the requirements, the electronic control unit opens the second filtering part (120) to filter and reduce the pressure, and transmits the natural gas to the flow meter (40) in the second regulating part (130) to measure the natural gas flow meter (40), and then transmits it to the natural gas intake branch path (300); S20. After the oxygen enters the oxygen intake branch (400), the data is secondary confirmed with the oxygen flow meter (40) and transmitted to the oxyfuel burner (500); After the natural gas enters the natural gas intake branch (300), the data is secondary confirmed and measured by the natural gas flow meter (40) before being transferred to the oxyfuel burner (500).

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