A low-carbon emission fuel mixing device for industrial kilns

Abstract

The present invention discloses a low-carbon emission fuel gas mixing device for an industrial furnace, including an explosion-proof chassis, the explosion-proof chassis is provided with a ratio control cabinet and a gas distribution actuator, the ratio control cabinet is used for electrically controlling and distributing various mixed gases, collecting and displaying the flow, pressure and ratio of the mixed gases; the gas distribution actuator is connected to each mixed gas, and the ratio control cabinet is used to control and distribute each mixed gas to provide a precisely proportioned mixed gas. The present invention uses a flow meter and a pressure sensor to indicate the flow and pressure of various gases, calculates the amount of gas to be injected through the ratio, automatically adjusts the content of the secondary gas to be added when the main gas flow changes, and uses an analyzer to monitor the percentage content ratio of the ratio gas in real time, and displays the percentage content of various component gases, thereby improving the ratio accuracy and stability of the mixed gas, and can add hydrogen to natural gas at the same time, which can reduce carbon emissions and fuel costs.

Description

Technical Field

[0001] The invention relates to the technical field of industrial furnace fuel mixing devices, and in particular to a low-carbon emission fuel mixing device for an industrial furnace. Background Art

[0002] Most of the current industrial kiln industries use natural gas as the main fuel. According to relevant national standards, the CH4 content in pipeline natural gas accounts for more than 95%, and the total of other combustible components such as ethane, propane, butane, pentane, and hexane accounts for about 0.4%; this type of hydrocarbon methane and ethane and other combustible components will produce more CO and CO2 after combustion; it does not meet the requirements of reducing carbon emissions and cannot respond to the strategic dual goals of carbon peak and carbon neutrality. At the same time, the use of natural gas alone also has a higher fuel cost.

[0003] For example: the invention application with application number 202323271516.3 discloses an industrial gas mixing device based on the Tesla valve principle. The application scheme can realize multi-stage mixing of industrial gas, produce industrial gas with different calorific value levels, increase the mixing effect of efficiency-enhancing gas and gas, and make the calorific value of the mixed industrial gas closer to the theoretical calorific value. It is suitable for use in mixing industrial gas, but the device also has the following problems: 1. The whole device is not explosion-proof and is not suitable for mixing hydrogen; 2. There is no visual precision control adjustment, and the mixing accuracy is not easy to grasp. Summary of the invention

[0004] In view of the above-mentioned problems, the purpose of the present invention is to provide a low-carbon emission fuel mixing device for an industrial furnace, which automatically calculates the proportion of the mixed gas, displays the percentage content of the mixed gas in real time, improves the proportion accuracy and stability of the mixed gas, and reduces carbon emissions.

[0005] The purpose of the present invention can be achieved by the following technical solution: A low-carbon emission fuel mixing device for an industrial furnace, comprising an explosion-proof chassis, wherein the explosion-proof chassis is provided with a proportioning control cabinet and a gas distribution actuator, wherein:

[0006] Proportioning control cabinet, used for electrical control and mixing of various mixed gases, collecting and displaying the flow, pressure and ratio of mixed gases;

[0007] The gas distribution actuator is connected to each mixed gas, and the mixed gas is controlled and distributed by the proportioning control cabinet to provide a precisely proportioned mixed gas.

[0008] As a further solution of the present invention, the explosion-proof chassis adopts a fully enclosed design and is filled with nitrogen for positive pressure protection.

[0009] As a further solution of the present invention, the explosion-proof chassis is installed with a gas leak detector, and the gas leak detector is used to detect the gas environment inside the explosion-proof chassis.

[0010] As a further solution of the present invention, a forklift foot opening is reserved at the bottom of the explosion-proof chassis.

[0011] With the above structure, a proportioning control cabinet and a gas distribution actuator are arranged in the explosion-proof chassis. The modular structure is easy to use. The overall sampling design of the explosion-proof chassis has a reserved forklift foot opening, which makes it quick and convenient to move. The nitrogen positive pressure protection is safe and reliable, and the gas monitoring alarm can further prevent accidents.

[0012] As a further solution of the present invention, the proportioning control cabinet includes a touch display screen, a pressure difference system calculation unit and a PLC control unit, and supports remote intelligent control;

[0013] The proportioning control cabinet collects the flow rate and pressure of each mixed gas through a flow meter and a pressure sensor, calculates the required injection amount of the auxiliary gas through a pressure difference system calculation unit, and feeds the required injection amount back to the PLC control unit. The PLC control unit controls the auxiliary gas flow rate based on the injection amount.

[0014] The proportioning control cabinet can be used to adjust the gas distribution parameters. It has a clear interface, digital input, one-key operation, one-key storage, instantaneous gas distribution, and interlocking functions to prevent misoperation. The proportioning control cabinet also has multiple sets of self-compiled programs built in to fill the problem of insufficient linear measurement of the mass flow meter. It can automatically trigger the conversion program under low flow conditions to stabilize the gas supply.

[0015] As a further solution of the present invention, the gas distribution actuator includes a first mixer, a second mixer and a gas pipeline;

[0016] The gas pipeline includes a main gas pipeline, a secondary gas pipeline, a mixed gas pipeline and a nitrogen pipeline;

[0017] Among them, a manual valve, a pneumatic valve, a pressure reducing valve, a pressure sensor and a flow meter assembly are installed on the gas transmission pipeline; the pneumatic valve, the pressure reducing valve, the pressure sensor and the flow meter assembly are electrically connected to the proportioning control cabinet.

[0018] As a further solution of the present invention, the second mixer outlet is provided with a sampling port, a mixed gas outlet and a venting port;

[0019] Among them, the sampling port pipeline is installed with a pneumatic valve and is externally connected to an analyzer; the mixed gas outlet pipeline is installed with a pneumatic valve, a pressure gauge and a pressure sensor; and the venting port pipeline is installed with a pneumatic valve.

[0020] As a further solution of the present invention, the flow meter assembly on the main gas pipeline includes an electromagnetic flow meter, the electromagnetic flow meter is connected to a mass flow meter, and the electromagnetic flow meter and the mass flow meter are electrically connected to a proportioning control cabinet; the flow meter assembly on the secondary gas pipeline includes an electromagnetic flow meter, a proportional control valve and a diaphragm actuator valve, and the electromagnetic flow meter and the proportional control valve are electrically connected to the proportioning control cabinet.

[0021] Digital gas flowmeters and pressure sensors are used to indicate the flow and pressure of various gases. The amount of gas to be injected is calculated through the ratio calculation to improve the ratio accuracy and stability of the mixed gas.

[0022] As a further solution of the present invention, the first mixer is connected to a nitrogen pipeline, the nitrogen pipeline is installed with a pressure valve, and the pressure valve is electrically connected to a proportioning control cabinet.

[0023] As a further solution of the present invention, the mixed gas combination includes:

[0024] When the main gas is natural gas, the secondary gas is hydrogen;

[0025] When the main gas is ammonia, the secondary gas is hydrogen.

[0026] Beneficial effects of the present invention:

[0027] 1. The present invention can be used to mix hydrogen into natural gas, which can reduce carbon emissions, actively respond to the strategic dual goals of carbon peak and carbon neutrality, and at the same time reduce fuel costs.

[0028] 2. The present invention adopts a digital gas flow meter and a pressure sensor to indicate the flow and pressure of various gases. The amount of gas to be injected is calculated through the proportioning to achieve the required mixed content. The proportioning automatically adjusts the content of the auxiliary gas to be added when the main gas flow changes, and the analyzer monitors the percentage ratio of the proportioning gas in real time, displays the percentage content of various component gases, and improves the proportioning accuracy and stability of the mixed gas.

[0029] 3. The explosion-proof chassis of the present invention has reserved forklift foot openings, which is quick and convenient to move, and is provided with a combustible gas leakage alarm with three levels of leakage values: leakage warning, alarm when the leakage value continues to rise, power off at the critical point, and self-cutting all air intake valves, which is safe and reliable. At the same time, the explosion-proof chassis has nitrogen positive pressure protection, which is safe and reliable to use.

[0030] 4. The proportioning control cabinet of the present invention supports remote intelligent control, and adopts a touch display screen to realize the adjustment of gas distribution parameters. It has a clear interface, digital input, one-key operation, one-key storage, instantaneous gas distribution, and interlocking functions to absolutely prevent misoperation. The proportioning control cabinet also has multiple sets of self-compiled programs built in, which can fill the problem of insufficient linear measurement of mass flow meters. It can automatically trigger the conversion program under low flow conditions to stabilize the gas supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a low-carbon emission fuel mixing device for an industrial kiln according to the present invention;

[0032] Figure 2 This is a schematic diagram of the pipeline structure of the low-carbon emission fuel mixing device for an industrial kiln of the present invention;

[0033] Figure 3 It is a structural schematic diagram of the positive pressure protection pipeline of the gas mixing device of the present invention;

[0034] Figure 4 It is the gas parameter display setting interface of the touch screen of the proportioning control cabinet of the present invention. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] The existing gas mixing device cannot perform visual precision control and adjustment on the mixed gas, and it is not easy to obtain high-precision mixed gas.

[0037] In view of the above problems, the present invention discloses a low-carbon emission fuel mixing device for an industrial kiln, such as Figure 1 As shown, it includes an explosion-proof chassis, in which a proportioning control cabinet and a gas distribution actuator are arranged. The explosion-proof chassis has an overall sampling design and a forklift foot opening is reserved for quick and convenient movement.

[0038] The explosion-proof chassis is equipped with a combustible gas leak alarm to monitor the environment inside the explosion-proof chassis. It is equipped with three levels of leakage values, leakage warning, and alarm when the leakage value continues to rise. The critical point has its own power off, which automatically cuts off all air intake valves.

[0039] The proportioning control cabinet includes components such as a touch screen, a pressure difference system calculation unit and a PLC control unit; it is mainly used for electrical control and blending of various mixed gases, and for collecting and displaying the mixed gas proportions.

[0040] The proportioning control cabinet can check and adjust the gas distribution parameters and alarm parameters on site through the touch screen. When low pressure, low or high ratio, gas leakage, etc. occur during the proportioning process, the proportioning control cabinet will output an alarm to the on-site light alarm and display various fault information on the touch screen.

[0041] The proportioning control cabinet supports remote intelligent control. During operation, the equipment can be remotely controlled and operated, and the workflow and working status can be intuitively displayed. In the place of use, the proportioning control cabinet and the gas distribution actuator can be set separately to improve safety.

[0042] The gas distribution actuator includes a first mixer, a second mixer and various gas pipelines and other components. The gas distribution actuator is mainly connected to various mixed gases, controls and distributes various mixed gases according to the ratio control cabinet, and outputs accurately proportioned mixed gases.

[0043] The explosion-proof chassis adopts a fully enclosed design and is filled with nitrogen for positive pressure protection. When the flammable gas in the explosion-proof chassis leaks or the pipeline needs gas replacement, the explosion-proof chassis is relatively closed. If nitrogen is not filled, if the proportioning control cabinet has an electrical short circuit, the proportioning control cabinet is prone to fire and other accidents. Filling with nitrogen can avoid accidents.

[0044] Nitrogen explosion-proof pipeline structure Figure 3 As shown, it includes an air inlet pipe, on which instruments and pressure reducing valves are installed in sequence, the pipe is connected to the interior of the explosion-proof chassis, the instrument is also connected to an exhaust pipe, and the exhaust pipe is installed with multiple automatic valves and silencers to achieve exhaust and silencing of nitrogen in the explosion-proof chassis.

[0045] The schemes that can be adopted in the mixed gas include: the main gas is natural gas, and the secondary gas is hydrogen; hydrogen is mixed in natural gas. According to the national standard "General Technical Requirements for Hydrogen Gas Burners", the maximum proportion of hydrogen mixed in natural gas is ≤20%; the formula ratio of natural gas and hydrogen can be adjusted to: 8.0:2.0, 8.5:1.5, 9.0:1.0, 9.5:0.5 and other formula ratios. The carbon emissions after combustion of the mixed gas are reduced by about 5% to 20%, and the overall cost is reduced.

[0046] The mixed gas combination can also use ammonia as the main gas and hydrogen as the secondary gas, and ammonia mixed with ammonia. After the mixed gas is burned, no CO and CO2 are produced, which can effectively reduce carbon emissions.

[0047] like Figure 2 As shown, the various gas pipelines include main gas pipelines, auxiliary gas pipelines, mixed gas pipelines and nitrogen pipelines, etc.

[0048] The main gas pipeline structure includes: the air inlet pipeline, on which manual valves, pressure gauges, flame arresters, pressure reducing valves, pressure sensors, flow regulating components and pneumatic valves are installed in sequence. Among them, the pressure reducing valve is mainly used for pressure stabilization, and the manual valve and pneumatic valve are used to control the on and off of the gas and stop the operation of the equipment. Pressure sensor: monitors the pressure of the mixed gas.

[0049] Among them, the flow regulation component includes two manual flow control valves and an electromagnetic flowmeter. The electromagnetic flowmeter is installed between the two manual flow control valves. The electromagnetic flowmeter is also connected to a mass flowmeter. The electromagnetic flowmeter and the mass flowmeter are electrically connected to the proportioning control cabinet; the proportioning control cabinet obtains the flow of the main gas through the electromagnetic flowmeter and the mass flowmeter; the two manual flow control valves are also connected in parallel with a manual emergency valve to deal with emergencies.

[0050] The auxiliary gas pipeline structure includes: an air inlet pipeline, on which a manual valve, a pressure gauge, a flame arrester, a filter, a pressure sensor, a flow regulating component and a pneumatic valve are installed in sequence.

[0051] The auxiliary gas pipeline flow control component includes two manual flow control valves, an electromagnetic flowmeter, a ratio adjustment valve and a membrane actuator valve, wherein the electromagnetic flowmeter, the ratio adjustment valve and the membrane actuator valve are installed between the two manual flow control valves, the ratio adjustment valve is installed between the electromagnetic flowmeter and the membrane actuator valve, and the ratio adjustment valve and the electromagnetic flowmeter are electrically connected to the proportioning control cabinet; the proportioning control cabinet adjusts the flow of the auxiliary gas pipeline by controlling the ratio adjustment valve. The action of the auxiliary gas flow adjustment component is directly controlled by the proportioning control cabinet and is a key component of the mixing proportioning.

[0052] The main gas and the auxiliary gas are connected to the primary mixer together, premixed in the primary mixer, and then enter the secondary mixer for deep mixing to obtain a mixed gas with a uniform ratio.

[0053] During the first debugging or when the mixed gas ratio is changed, the mixer can be operated in conjunction with the vent valve, which is energy-saving and convenient, and operates automatically after obtaining accurate data under the monitoring of the analyzer.

[0054] The second mixer pipeline outlet includes a sampling exhaust port, a mixed gas outlet and an experimental vent port; wherein, the second mixer outlet main pipeline is installed with a pressure gauge and a pressure sensor, and the pressure sensor is electrically connected to the proportioning control cabinet, so that the pipeline pressure can be checked on-site or collected remotely, and the outlet main pipeline connects the sampling port pipeline, the mixed gas outlet pipeline and the vent pipe.

[0055] The sampling port pipeline is installed with a pneumatic valve and is externally connected to an analyzer, which is electrically connected to the ratio control cabinet; the mixed gas outlet pipeline is installed with a pneumatic valve, a pressure gauge and a pressure sensor; the vent pipeline is installed with a pneumatic valve, and through the setting of the sampling port and the vent port, the mixed gas components can be sampled, and analyzed and measured by the analyzer to accurately grasp the mixed gas components and proportions; the vent port can be used for venting and running during the first debugging or when the ratio is changed. After the accurate ratio is obtained under the monitoring of the analyzer, the device will run automatically again.

[0056] Furthermore, the first mixer is connected to a nitrogen pipeline; the nitrogen pipeline structure includes: an air inlet pipeline, on which a manual valve, a pressure gauge, a pressure reducing valve, a pressure sensor, a manual flow control valve and a pneumatic valve are installed in sequence.

[0057] Nitrogen is used as the driving gas source. The associated proportioning control cabinet provides nitrogen protection for the explosion-proof chassis. When changing the gas or cleaning the pipeline, nitrogen is used as the purge gas source to purge the pipeline. During normal gas mixing operation, the nitrogen pipeline does not participate in the entire process.

[0058] The mixed gas flow rate through this device can reach 6000Nm 3 / h as an example: some of the achievable technical indicators are shown in Table 1:

[0059] Table 1 Technical indicators of mixed gas

[0060]

[0061]

[0062] By using the gas mixing device of the present invention, the gas entering the gas distribution actuator is reduced in pressure and stabilized, and the various gas flows and pressures are indicated by digital gas flow meters and pressure sensors. Then, the amount of gas to be injected is calculated by proportioning to achieve the required mixed content of the proportioning. The two proportioning gases are mixed by the primary and secondary mixers. When the main gas flow changes, the content of the auxiliary gas to be added is automatically adjusted, and the percentage ratio of the proportioning gas is monitored in real time by the analyzer to display the percentage content of various component gases. After reaching the required ratio, it is sent to the use site through the mixed gas outlet.

[0063] The present invention adopts a digital flow meter, which can display the gas consumption of each gas in real time. When the main gas inlet pressure fluctuates, the auxiliary gas addition amount is automatically adjusted to maintain the ratio content. A high-precision pressure sensor is used to monitor the mixed gas pressure in real time, and multiple alarms are set to ensure the normal operation of the gas distribution actuator to the maximum extent. The explosion-proof chassis adopts a split structure, which is composed of an independent ratio control cabinet and a gas distribution actuator, and supports remote intelligent control. At the same time, the explosion-proof chassis is fully enclosed as a whole and is protected by nitrogen positive pressure.

[0064] The gas distribution parameters can be adjusted by using the proportioning control cabinet, with a clear interface, digital input, one-key operation, one-key storage, instantaneous gas distribution, and interlocking functions to absolutely prevent misoperation; gas property parameters include: low calorific value, high calorific value, relative density, low calorific value Wobac number, high calorific value Wobac number and combustion potential, etc. The gas properties can be automatically calculated according to the specific gas gas composition of the national standard GB / T 13611-2018 "Town Gas and Its Basic Classification". The gas parameter setting interface is as follows: Figure 4 shown.

[0065] At the same time, the device is equipped with a primary and secondary mixer. When the first debugging or ratio change, the vent valve is linked to run, which is energy-saving and convenient. It can automatically run after obtaining accurate data under the monitoring of the analyzer. The proportioning control cabinet also has multiple sets of built-in self-compiled programs to fill the problem of insufficient linear measurement of mass flow meters. Under low flow conditions, the conversion program can be automatically triggered to stabilize the gas supply.

[0066] At the same time, the explosion-proof chassis adopts an integral cabinet design with reserved forklift feet, which is quick and convenient to move; and is equipped with a combustible gas leakage alarm with three levels of leakage value: leakage warning, continuous leakage value increase alarm, critical point with power off, and self-cut off all intake valves. The mixed gas outlet can also be set to 3-5m 3 Buffer tank.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0068] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A low-carbon emission fuel mixing device for an industrial kiln, characterized in that: It includes an explosion-proof chassis, which is provided with a proportioning control cabinet and a gas distribution actuator, wherein: Proportioning control cabinet, used for electrical control and mixing of various mixed gases, collecting and displaying the flow, pressure and ratio of mixed gases; The gas distribution actuator is connected to each mixed gas, and the mixed gas is controlled and distributed by the proportioning control cabinet to provide a precisely proportioned mixed gas.

2. The gas mixing device according to claim 1, characterized in that: The explosion-proof chassis adopts a fully enclosed design and is filled with nitrogen for positive pressure protection.

3. The gas mixing device according to claim 1, characterized in that: The explosion-proof chassis is equipped with a gas leak detector, which is used to detect the gas environment inside the explosion-proof chassis.

4. The gas mixing device according to claim 1, characterized in that: A forklift foot opening is reserved at the bottom of the explosion-proof chassis.

5. The gas mixing device according to claim 1, characterized in that: The proportioning control cabinet includes a touch display screen, a pressure difference system calculation unit and a PLC control unit, and supports remote intelligent control; The proportioning control cabinet collects the flow rate and pressure of each mixed gas through a flow meter and a pressure sensor, calculates the required injection amount of the auxiliary gas through a pressure difference system calculation unit, and feeds the required injection amount back to the PLC control unit, and the PLC control unit controls the auxiliary gas flow rate according to the injection amount.

6. The gas mixing device according to claim 1, characterized in that: The gas distribution actuator comprises a first mixer, a second mixer and a gas pipeline; The gas pipeline includes a main gas pipeline, a secondary gas pipeline, a mixed gas pipeline and a nitrogen pipeline; Among them, a manual valve, a pneumatic valve, a pressure reducing valve, a pressure sensor and a flow meter assembly are installed on the gas transmission pipeline; the pneumatic valve, the pressure reducing valve, the pressure sensor and the flow meter assembly are electrically connected to the proportioning control cabinet.

7. The gas mixing device according to claim 6, characterized in that: The outlet of the second mixer is provided with a sampling port, a mixed gas outlet and a venting port; Among them, the sampling port pipeline is installed with a pneumatic valve and is externally connected to an analyzer; the mixed gas outlet pipeline is installed with a pneumatic valve, a pressure gauge and a pressure sensor; and the venting port pipeline is installed with a pneumatic valve.

8. The gas mixing device according to claim 6, characterized in that: The flow meter assembly on the main gas pipeline includes an electromagnetic flow meter, which is connected to a mass flow meter, and the electromagnetic flow meter and the mass flow meter are electrically connected to a proportioning control cabinet; the flow meter assembly on the secondary gas pipeline includes an electromagnetic flow meter, a proportional control valve and a diaphragm actuator valve, and the electromagnetic flow meter and the proportional control valve are electrically connected to the proportioning control cabinet.

9. The gas mixing device according to claim 6, characterized in that: The first mixer is connected to a nitrogen pipeline, a pressure valve is installed on the nitrogen pipeline, and the pressure valve is electrically connected to a proportioning control cabinet.

10. The gas mixing device according to claim 1, characterized in that: The mixed gas combination comprises: When the main gas is natural gas, the secondary gas is hydrogen; When the main gas is ammonia, the secondary gas is hydrogen.

Images