Natural gas and coal gas mixed combustion expert system

Abstract

The invention relates to the technical field of glass manufacturing, in particular to a natural gas and coal gas mixed combustion system which comprises a natural gas supply unit comprising a natural gas supply pipeline and a first regulating valve group connected to the natural gas supply pipeline; the coal gas supply unit comprises a coal gas supply pipeline and a second regulating valve group connected to the coal gas supply pipeline; the first calorific value instrument is located on the natural gas supply pipeline and used for monitoring calorific value changes of natural gas; the second calorific value instrument is positioned on the coal gas supply pipeline and is used for monitoring the calorific value change of the coal gas; the dynamic proportion adjusting device is connected with the natural gas supply unit and the coal gas supply unit and used for adjusting the mixing proportion of the natural gas output by the natural gas supply unit and the coal gas output by the coal gas supply unit to obtain mixed gas, and the mixed gas is input into the combustor to be combusted. By monitoring the fuel heat value and optimizing the fuel mixing proportion and combustion parameters, the efficient and clean glass melting process is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass manufacturing, in particular to a natural gas and coal gas mixed combustion system. BACKGROUND

[0002] Traditional glass melting furnaces mostly use single fuel systems, and common fuels and their characteristics are as follows: Natural gas combustion system: high cost, high heat value (~8000 KJ / Nm³), relatively complete combustion, relatively small environmental pollution, but low flame brightness, resulting in relatively weak radiation heat transfer capacity.

[0003] Coal gas combustion system: low cost, but low heat value (~3400 KJ / Nm³), higher requirements for combustion control and heat utilization efficiency of the furnace.

[0004] Heavy oil combustion system: high heat value (~9300 kJ / kg), but high sulfur content, easy to increase the emission of pollutants such as sulfur dioxide in flue gas, and high environmental and emission treatment pressure.

[0005] The main problem faced by the prior art is that a single fuel system is difficult to balance economy and environmental protection, and it is difficult to simultaneously achieve low cost and low emission under different working conditions. When coal gas is used alone, the heat value is low, which is difficult to independently meet the combustion standard of the furnace, and is easy to cause energy consumption to rise and heat load to be unstable. Fuel costs fluctuate greatly, and a single fuel system lacks flexibility to market fluctuations, and the operating cost is easily affected by raw material price fluctuations, and the heat load of the furnace fluctuates and the emission treatment pressure increases. SUMMARY

[0006] In view of the above problems, the purpose of the present application is to provide a natural gas and coal gas mixed combustion system.

[0007] A natural gas and coal gas mixed combustion expert system, comprising: A natural gas supply unit, comprising a natural gas supply pipeline and a first adjusting valve group connected to the natural gas supply pipeline; A coal gas supply unit, comprising a coal gas supply pipeline and a second adjusting valve group connected to the coal gas supply pipeline; A first heat value instrument located on the natural gas supply pipeline for monitoring the heat value change of the natural gas; A second heat value instrument located on the coal gas supply pipeline for monitoring the heat value change of the coal gas; A dynamic proportional adjusting device connected to the natural gas supply unit and the coal gas supply unit, which adjusts the mixed ratio of the natural gas output by the natural gas supply unit and the coal gas output by the coal gas supply unit to obtain a mixed gas, and the mixed gas is input into a burner for combustion.

[0008] The natural gas and coal gas mixed combustion expert system, the natural gas supply unit comprises: A first thermometer connected to the natural gas supply pipeline for collecting the temperature of the natural gas in the natural gas supply pipeline; A first pressure gauge connected to the natural gas supply pipeline for collecting the pressure of the natural gas in the natural gas supply pipeline; A natural gas filtering device connected to the natural gas supply pipeline for filtering the natural gas in the natural gas supply pipeline; A natural gas flow meter connected to the natural gas supply pipeline for collecting the flow of the natural gas in the natural gas supply pipeline; A first emergency cut-off device connected to the natural gas supply pipeline and located between the natural gas filtering device and the natural gas flow meter.

[0009] The natural gas and coal gas mixed combustion expert system, the natural gas supply unit comprises: A natural gas primary pressure regulating device connected to the natural gas supply pipeline and located downstream of the natural gas flow meter; A natural gas diffusion device connected to the natural gas supply pipeline and located downstream of the natural gas flow meter; A natural gas distribution pipe connected to the natural gas supply pipeline; A natural gas secondary pressure regulating device connected to the natural gas supply pipeline, and an output end of the natural gas secondary pressure regulating device is connected to the dynamic proportional regulating device.

[0010] The natural gas and coal gas mixed combustion expert system, the coal gas supply unit comprises: A second thermometer connected to the coal gas supply pipeline for collecting the temperature of the coal gas in the coal gas supply pipeline; A second pressure gauge connected to the coal gas supply pipeline for collecting the pressure of the coal gas in the coal gas supply pipeline; A coal gas filtering device connected to the coal gas supply pipeline for filtering the coal gas in the coal gas supply pipeline; A coal gas flow meter connected to the coal gas supply pipeline for collecting the flow of the coal gas in the coal gas supply pipeline; A second emergency cut-off device connected to the coal gas supply pipeline and located between the coal gas filtering device and the coal gas flow meter.

[0011] The natural gas and coal gas mixed combustion expert system, the coal gas supply unit comprises: A coal gas primary pressure regulating device is connected to the coal gas supply pipeline and located downstream of the coal gas flow meter; A coal gas diffusing device is connected to the coal gas supply pipeline and located downstream of the coal gas flow meter; A coal gas distribution pipe is connected to the coal gas supply pipeline; A coal gas secondary pressure regulating device is connected to the coal gas supply pipeline, and an output end of the coal gas secondary pressure regulating device is connected to the dynamic proportional regulating device.

[0012] The natural gas and coal gas mixed combustion expert system adopts a dynamic proportional regulating device to realize the proportioning of coal gas and natural gas in a range of 10%-50%.

[0013] The natural gas and coal gas mixed combustion expert system has a supply pressure of the natural gas of 0.2-0.25 MPa, a blending ratio of the coal gas of 35%, a melting furnace temperature of 1580±10℃, and smoke emission of SO2<50 mg / m³ and NOx<300 mg / m³.

[0014] The natural gas and coal gas mixed combustion expert system has a burner including a melting zone and a cooling zone, the coal gas proportion of the melting zone is 40%, and the natural gas proportion of the cooling zone is 100%.

[0015] The natural gas and coal gas mixed combustion expert system includes an intelligent control system connected to the first calorific value instrument, the second calorific value instrument, the dynamic proportional regulating device, the natural gas supply unit and the coal gas supply unit, and the intelligent control system monitors the composition and calorific value of the coal gas and the natural gas in real time, adjusts the pressure in real time, dynamically adjusts the proportion of the natural gas and the coal gas, and controls emergency diffusion.

[0016] The natural gas and coal gas mixed combustion expert system is used for photovoltaic glass or float glass production lines.

[0017] Beneficial effects: The natural gas and coal gas mixed combustion expert system monitors the fuel calorific value, optimizes the fuel mixing proportion and combustion parameters, realizes efficient mixing and stable combustion of two fuels, reduces the fuel cost of glass production, improves the thermal efficiency, and significantly reduces the pollutant emission. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a front end schematic view of the natural gas and coal gas mixed combustion expert system of the present application; Fig. 2This is a schematic diagram of the backend of a natural gas and coal gas co-combustion expert system according to a specific embodiment of the present invention; Fig. 3 This is a schematic diagram of the system structure of a specific embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0022] Reference Figs. 1 to 3 A natural gas and coal gas co-combustion expert system, comprising: Natural gas supply unit 1 includes a natural gas supply pipeline and a first regulating valve assembly connected to the natural gas supply pipeline; The coal gasification supply unit 2 includes a coal gasification supply pipeline and a second regulating valve group connected to the coal gasification supply pipeline; The first calorific value meter 11 is located on the natural gas supply pipeline and is used to monitor changes in the calorific value of natural gas; The second calorific value meter 21 is located on the coal gas supply pipeline and is used to monitor the changes in the calorific value of coal gas. The dynamic proportioning device 30 is connected to the natural gas supply unit 1 and the coal gas supply unit 2. It adjusts the mixing ratio of the natural gas output from the natural gas supply unit 1 and the coal gas output from the coal gas supply unit 2 to obtain a mixed gas. The mixed gas is then input into the burner C for combustion.

[0023] The natural gas and coal gas co-combustion expert system of this invention achieves efficient mixing and stable combustion of the two fuels by monitoring the calorific value of the fuels and optimizing the fuel mixing ratio and combustion parameters. This system can reduce fuel costs in glass production by more than 20%, increase thermal efficiency to over 70%, and significantly reduce pollutant emissions. It is particularly suitable for the melting processes of various glass products such as float glass and photovoltaic glass.

[0024] In a preferred embodiment, the natural gas supply unit 1 includes: The first thermometer 12 is connected to the natural gas supply pipeline and is used to collect the temperature of the natural gas in the natural gas supply pipeline. The first pressure gauge 13 is connected to the natural gas supply pipeline and is used to collect the pressure of natural gas in the natural gas supply pipeline. Natural gas filtration device 14 is connected to the natural gas supply pipeline to filter the natural gas in the natural gas supply pipeline; Natural gas flow meter 16 is connected to the natural gas supply pipeline and is used to collect the flow rate of natural gas in the natural gas supply pipeline; The first emergency shut-off device 15 is connected to the natural gas supply pipeline and is located between the natural gas filter device 14 and the natural gas flow meter 16.

[0025] In a preferred embodiment, the natural gas supply unit 1 includes: The primary pressure regulating device 17 for natural gas is connected to the natural gas supply pipeline and is located downstream of the natural gas flow meter 16; The natural gas venting device 18 is connected to the natural gas supply pipeline and is located downstream of the natural gas flow meter 16; Natural gas distribution pipe A11 is connected to the natural gas supply pipeline; The natural gas secondary pressure regulating device 19 is connected to the natural gas supply pipeline, and the output end of the natural gas secondary pressure regulating device 19 is connected to the dynamic proportional regulating device 30.

[0026] Natural gas supply unit 1 includes a main pipeline, purification unit, regulating valve and flow meter, and is responsible for supplying the required natural gas.

[0027] In a preferred embodiment, the coal gasification supply unit 2 includes: The second thermometer 21 is connected to the coal gas supply pipeline and is used to collect the temperature of the coal gas in the coal gas supply pipeline. The second pressure gauge 23 is connected to the coal gas supply pipeline and is used to collect the pressure of the coal gas in the coal gas supply pipeline. The coal gasification filter 24 is connected to the coal gas supply pipeline to filter the coal gas in the coal gas supply pipeline. The coal gas flow meter 26 is connected to the coal gas supply pipeline and is used to collect the flow rate of coal gas in the coal gas supply pipeline. The second emergency shut-off device 25 is connected to the coal gas supply pipeline and is located between the coal gas filter device 24 and the coal gas flow meter 16.

[0028] The natural gas and coal gas co-combustion expert system of the present invention includes a coal gas supply unit 2 comprising: The primary pressure regulating device 27 for coal gasification is connected to the coal gas supply pipeline and is located downstream of the coal gas flow meter. The coal gasification venting device 28 is connected to the coal gasification supply pipeline and is located downstream of the coal gasification flow meter. Coal gasification distribution pipe B11 is connected to the coal gasification supply pipeline; The secondary pressure regulating device 29 for coal gasification is connected to the coal gas supply pipeline, and the output end of the secondary pressure regulating device 29 is connected to the dynamic proportional regulating device 30.

[0029] The coal gasification supply unit 2 includes a main pipeline, a purification device, a regulating valve, and a flow meter.

[0030] In a preferred embodiment of the present invention, the dynamic proportioning device uses dynamic proportioning to achieve a precise ratio of coal gas to natural gas within the range of 10%-50%.

[0031] In one specific embodiment of the present invention, the burner C includes a melting zone and a cooling zone, wherein the proportion of coal-to-gas in the melting zone is 40% and the proportion of natural gas in the cooling zone is 100%.

[0032] The mixing system of this invention can ensure thorough mixing and stable combustion of the two fuels.

[0033] A preferred embodiment of the present invention includes an intelligent control system connected to a first calorific value meter, a second calorific value meter, a dynamic proportional adjustment device, a natural gas supply unit, and a coal gas supply unit. The intelligent control system monitors the composition and calorific value of the coal gas and natural gas in real time, adjusts the pressure in real time, dynamically adjusts the ratio of natural gas to coal gas, and controls emergency release. It can monitor and optimize combustion parameters in real time, adjusting the air-fuel ratio and combustion temperature.

[0034] This invention can be used in photovoltaic glass or float glass production lines.

[0035] First embodiment: This invention is used in a 600t / d float glass production line. The natural gas supply pressure is 0.2MPa-0.25MPa, and the operating parameters include a coal-to-gas blending ratio of 35%, a furnace temperature of 1580±10℃, and flue gas emissions of SO2<50mg / m³ and NOx<300mg / m³. Implementation results: Fuel costs were reduced by 22%, thermal efficiency was increased to 72%, and CO2 emissions were reduced by approximately 15,000 tons per year.

[0036] Second embodiment: Optimized application in photovoltaic glass melting furnace The system employs zoned combustion technology, with the melting zone using 40% coal gas and the cooling zone using pure natural gas combustion. High-alumina-zirconium corundum composite bricks are used as refractory materials, and electrofused AZS bricks are used in key areas. This increases the product qualification rate by 3.2% and extends the kiln life by 15%.

[0037] The description and accompanying drawings provide typical embodiments of specific structures for specific implementations. Other modifications are possible based on the spirit of the invention. While the above-described invention presents preferred embodiments, these are not intended to be limiting.

[0038] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. An expert system for co-combustion of natural gas and coal gas, characterized in that, include: A natural gas supply unit includes a natural gas supply pipeline and a first regulating valve assembly connected to the natural gas supply pipeline; A coal gasification supply unit includes a coal gasification supply pipeline and a second regulating valve assembly connected to the coal gasification supply pipeline; The first calorific value meter is located on the natural gas supply pipeline and is used to monitor changes in the calorific value of natural gas; The second calorific value meter is located on the coal gas supply pipeline and is used to monitor the changes in the calorific value of the coal gas. A dynamic proportioning device is connected to the natural gas supply unit and the coal gas supply unit. It adjusts the mixing ratio of the natural gas output from the natural gas supply unit and the coal gas output from the coal gas supply unit to obtain a mixed gas, which is then input into a burner for combustion.

2. The natural gas and coal gasification co-combustion expert system according to claim 1, characterized in that, The natural gas supply unit includes: A first thermometer is connected to the natural gas supply pipeline and is used to collect the temperature of the natural gas in the natural gas supply pipeline; The first pressure gauge is connected to the natural gas supply pipeline and is used to collect the pressure of the natural gas in the natural gas supply pipeline; A natural gas filtration device is connected to the natural gas supply pipeline to filter the natural gas in the natural gas supply pipeline; A natural gas flow meter, connected to the natural gas supply pipeline, is used to collect the flow rate of natural gas within the natural gas supply pipeline; The first emergency shut-off device is connected to the natural gas supply pipeline and is located between the natural gas filter and the natural gas flow meter.

3. The natural gas and coal gasification co-combustion expert system according to claim 2, characterized in that, The natural gas supply unit includes: A primary pressure regulating device for natural gas is connected to the natural gas supply pipeline and located downstream of the natural gas flow meter; A natural gas venting device is connected to the natural gas supply pipeline and located downstream of the natural gas flow meter; A natural gas distribution pipe is connected to the natural gas supply pipeline; A natural gas secondary pressure regulating device is connected to the natural gas supply pipeline, and the output end of the natural gas secondary pressure regulating device is connected to the dynamic proportional regulating device.

4. The natural gas and coal gas co-combustion expert system according to claim 1, characterized in that, The coal gas supply unit includes: The second thermometer is connected to the coal gas supply pipeline and is used to collect the temperature of the coal gas in the coal gas supply pipeline. The second pressure gauge is connected to the coal gas supply pipeline and is used to collect the pressure of the coal gas in the coal gas supply pipeline. A coal gasification filter is connected to the coal gas supply pipeline to filter the coal gas in the coal gas supply pipeline. A coal gas flow meter is connected to the coal gas supply pipeline and is used to collect the flow rate of coal gas in the coal gas supply pipeline. The second emergency shut-off device is connected to the coal gas supply pipeline and is located between the coal gas filter and the coal gas flow meter.

5. The natural gas and coal gasification co-combustion expert system according to claim 4, characterized in that, The coal gas supply unit includes: A primary pressure regulating device for coal gasification is connected to the coal gas supply pipeline and located downstream of the coal gas flow meter. A coal gasification venting device is connected to the coal gas supply pipeline and located downstream of the coal gas flow meter; A coal gasification distribution pipe is connected to the coal gasification supply pipeline; A secondary pressure regulating device for coal gasification is connected to the coal gas supply pipeline, and the output end of the secondary pressure regulating device for coal gasification is connected to the dynamic proportional regulating device.

6. The natural gas and coal gasification co-combustion expert system according to claim 1, characterized in that, The dynamic proportioning device uses dynamic proportioning to achieve a ratio of coal gasification to natural gas within the range of 10%-50%.

7. The natural gas and coal gasification co-combustion expert system according to claim 1, characterized in that, The natural gas supply pressure is 0.2MPa-0.25MPa, the coal-to-gas blending ratio is 35%, the furnace temperature is 1580±10℃, and the flue gas emissions are SO2<50mg / m³ and NOx<300mg / m³.

8. The natural gas and coal gasification co-combustion expert system according to claim 1, characterized in that, The burner includes a melting zone and a cooling zone, wherein the proportion of coal-to-gas in the melting zone is 40% and the proportion of natural gas in the cooling zone is 100%.

9. The natural gas and coal gasification co-combustion expert system according to claim 1, characterized in that, It includes an intelligent control system, which is connected to the first calorific value meter, the second calorific value meter, the dynamic proportional adjustment device, the natural gas supply unit, and the coal gas supply unit. The intelligent control system monitors the composition and calorific value of the coal gas and natural gas in real time, adjusts the pressure in real time, dynamically adjusts the ratio of the natural gas and coal gas, and controls emergency release.

10. The natural gas and coal gas co-combustion expert system according to claim 1, characterized in that, Used in photovoltaic glass or float glass production lines.

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