Blending combustion system for coupling natural gas with biomass gas in kiln

Abstract

The utility model discloses a blending combustion system for coupling natural gas with biomass gas in a furnace kiln, which belongs to the technical field of biomass energy utilization and comprises a filtering device, a pressure regulating device, a purifying device, a first pressure stabilizing device, a gas mixing device, a second pressure stabilizing device, a flame arrester, the furnace kiln and an induced draft fan. According to the system, the natural gas and the biomass gas are coupled, mixed and combusted, the heat value defect of the biomass gas is overcome through the high heat value characteristic of the natural gas, the combustion temperature and heat efficiency of the kiln are guaranteed, the consumption of the natural gas can be reduced by mixing the biomass gas, the energy utilization efficiency and the environmental protection performance of the kiln are improved, and the fuel cost is reduced by more than 30%.

Description

Technical Field

[0001] This utility model relates to the field of biomass energy utilization technology, and more specifically to a co-combustion system for natural gas coupled with biomass fuel gas in a furnace. Background Technology

[0002] In today's energy landscape, the energy efficiency of kilns, as crucial thermal equipment in industrial production, is of paramount importance. Traditional kilns primarily rely on fossil fuels such as natural gas as their sole energy source, offering advantages like stable combustion and high calorific value. However, natural gas, as a non-renewable energy source, has limited reserves, and over-reliance leads to price fluctuations and increased production costs. Biomass gas, a renewable and clean energy source, is converted from biomass through gasification technology. Its raw material sources are diverse, including agricultural waste and forestry residues, enabling resource recycling and reducing environmental pollution. However, using biomass gas alone has limitations. On one hand, biomass gas has a relatively low calorific value, making it difficult to meet the high-temperature requirements of kilns when burned alone, impacting production efficiency and product quality. On the other hand, its gas production stability is affected by factors such as raw material characteristics and gasification processes, leading to unstable combustion.

[0003] Therefore, co-firing natural gas with biomass fuel gas is expected to combine the advantages of both. On the one hand, the high calorific value of natural gas can compensate for the calorific value deficiency of biomass fuel gas, ensuring the combustion temperature and thermal efficiency of the kiln; on the other hand, the addition of biomass fuel gas can reduce natural gas consumption, thereby lowering carbon emissions and operating costs. Utility Model Content

[0004] The present invention aims to provide a method for co-combustion of natural gas and biomass fuel in a kiln, which improves the energy utilization efficiency and environmental performance of the kiln and reduces fuel costs by more than 30%.

[0005] Therefore, one objective of this utility model is to provide a co-combustion system for natural gas coupled with biomass fuel gas in a furnace, including a filtration device, a pressure regulating device, a purification device, a first pressure stabilizing device, a fuel gas mixing device, a second pressure stabilizing device, a flame arrester, a furnace, and an induced draft fan.

[0006] The gas mixing device, the second pressure stabilizing device, the flame arrester, and the furnace are connected in sequence via pipelines.

[0007] The furnace is equipped with a plurality of mixed gas nozzles, which are arranged in a regular pattern, and each of the mixed gas nozzles is connected to the flame arrester; the furnace is also equipped with at least one combustion temperature detection device, which is fixedly installed in front of the plurality of mixed gas nozzles.

[0008] Each of the mixed gas nozzles is connected to the induced draft fan;

[0009] The filtration device is connected to the pressure regulating device, and the pressure regulating device is connected to the natural gas inlet of the gas mixing device;

[0010] The purification device is connected to the first pressure stabilizing device, and the first pressure stabilizing device is connected to the biomass gas inlet of the gas mixing device.

[0011] Preferably, the purification device of this invention can treat biomass gas to a tar content of <50mg / m³. 3 Dust content <10mg / m³ 3 Sulfide content <20mg / m 3 This meets the combustion process requirements of the furnace.

[0012] Furthermore, several of the mixed gas nozzles are arranged in two rows in a regular pattern, and a combustion temperature detection device is provided in front of each row of mixed gas nozzles.

[0013] Furthermore, the inlet of the filter device is connected to a medium-pressure natural gas pipeline, and an on / off valve and an emergency shut-off valve are sequentially installed between the medium-pressure natural gas pipeline and the filter device.

[0014] Furthermore, the inlet of the purification device is connected to the biomass gas pipeline, and an on / off valve and an emergency shut-off valve are sequentially installed between the biomass gas pipeline and the purification device.

[0015] Preferably, the on / off valve described in this utility model is used to manually cut off and open the source of natural gas and biomass fuel; the emergency shut-off valve can close the valve within 1 second in an emergency to cut off the source of natural gas and biomass fuel.

[0016] Furthermore, a first electric regulating valve is provided between the pressure regulating device and the gas mixing device;

[0017] A second electric regulating valve is provided between the first pressure stabilizing device and the gas mixing device.

[0018] Preferably, the electric regulating valve of this invention has an opening degree of 0%-100%, which can realize the mixing of natural gas and biomass gas in any proportion. The electric regulating valve can adjust the opening degree according to the combustion temperature feedback from the combustion temperature detection device to change the ratio of natural gas and biomass gas entering the gas mixing device, thereby changing the calorific value of the gas entering the mixing gas nozzle, and ultimately changing the combustion temperature. The combustion temperature can be precisely controlled within the range of 800-1500℃.

[0019] More preferably, the present invention can also use an electronic system to calculate the biomass gas blending ratio based on the opening degree of the electric regulating valve, and control the number of opening nozzles of the mixed gas by the blending ratio, so as to achieve a stable flow rate and complete combustion of the mixed gas.

[0020] Furthermore, the outlet pressure of the pressure regulating device is stabilized at 2000-3000 Pa.

[0021] Furthermore, the outlet pressure of the first pressure stabilizing device is stabilized at 500-1500 Pa, and the outlet pressure of the second pressure stabilizing device is stabilized at 1500-2000 Pa.

[0022] Furthermore, the induced draft fan is a variable frequency fan. The variable frequency fan can adjust its frequency according to the combustion temperature feedback from the combustion temperature detection device, thereby changing the amount of air entering the mixed gas nozzle and improving combustion efficiency.

[0023] Furthermore, the flame arrester described in this invention can prevent backfire of the mixed gas nozzle and damage to the front-end equipment.

[0024] Compared with the prior art, the present invention has the following beneficial effects: by coupling and blending natural gas and biomass gas for combustion, the high calorific value of natural gas is used to make up for the calorific value deficiency of biomass gas, ensuring the combustion temperature and thermal efficiency of the kiln, and the addition of biomass gas can reduce natural gas consumption, improve the energy utilization efficiency and environmental performance of the kiln, and reduce fuel costs by more than 30%. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of the co-combustion system for natural gas coupled with biomass fuel in the furnace provided by this utility model.

[0027] The structures represented by each number in the attached diagram are listed below: 1-Filter device, 2-Pressure regulating device, 3-Purification device, 4-First pressure stabilizing device, 5-Gas mixing device, 6-Second pressure stabilizing device, 7-Flame arrester, 8-Furnace, 9-Induced draft fan, 10-Mixed gas nozzle, 11-Combustion temperature detection device, 12-On / off valve, 13-Emergency shut-off valve, 14-First electric regulating valve, 15-Second electric regulating valve. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Example

[0034] A co-combustion system for natural gas coupled with biomass fuel gas in a furnace includes a filter device 1, a pressure regulating device 2, a purification device 3, a first pressure stabilizing device 4, a fuel gas mixing device 5, a second pressure stabilizing device 6, a flame arrester 7, a furnace 8, and an induced draft fan 9.

[0035] Among them, the gas mixing device 5, the second pressure stabilizing device 6, the flame arrester 7, and the furnace 8 are connected in sequence by pipelines;

[0036] The furnace 8 is equipped with several mixed gas nozzles 10, which are arranged in a regular manner. Each mixed gas nozzle 10 is connected to a flame arrester 7. The furnace 8 is also equipped with at least one combustion temperature detection device 11, which is fixedly installed in front of the several mixed gas nozzles 10.

[0037] Each mixed gas nozzle 10 is connected to the induced draft fan 9;

[0038] The filter device 1 is connected to the pressure regulating device 2, and the pressure regulating device 2 is connected to the natural gas inlet of the gas mixing device 5;

[0039] The purification device 3 is connected to the first pressure stabilizing device 4, and the first pressure stabilizing device 4 is connected to the biomass gas inlet of the gas mixing device 5.

[0040] In some embodiments, a plurality of mixed gas nozzles 10 are arranged in two rows in a regular manner, and a combustion temperature detection device 11 is provided in front of each row of mixed gas nozzles 10.

[0041] In some embodiments, the inlet of the filter device 1 is connected to a medium-pressure natural gas pipeline, and an on / off valve 12 and an emergency shut-off valve 13 are sequentially provided between the medium-pressure natural gas pipeline and the filter device 1.

[0042] In other embodiments, the inlet of the purification device 3 is connected to the biomass gas pipeline, and an on / off valve 12 and an emergency shut-off valve 13 are sequentially provided between the biomass gas pipeline and the purification device 3.

[0043] In some embodiments, a first electric regulating valve 14 is provided between the pressure regulating device 2 and the gas mixing device 5;

[0044] A second electric regulating valve 15 is provided between the first pressure stabilizing device 4 and the gas mixing device 5.

[0045] In some embodiments, the outlet pressure of the pressure regulating device 2 is stabilized at 2000-3000 Pa.

[0046] In other embodiments, the outlet pressure of the first pressure stabilizing device 4 is stabilized at 500-1500 Pa, and the outlet pressure of the second pressure stabilizing device 6 is stabilized at 1500-2000 Pa.

[0047] In some embodiments, the induced draft fan 9 is a variable frequency fan.

[0048] This utility model also provides the specific operation of a controllable blending and combustion system for natural gas coupled with biomass fuel gas in a furnace:

[0049] (1) The natural gas in the medium-pressure natural gas pipeline passes through the on-off valve, emergency shut-off valve, filter device, pressure regulating device and first electric regulating valve in sequence, and enters the gas mixing device.

[0050] (2) Biomass gas in the biomass gas pipeline passes through the on-off valve, emergency shut-off valve, purification device, first pressure stabilizing device and second electric regulating valve in sequence, and enters the gas mixing device.

[0051] (3) The mixed gas in the gas mixing device passes through the second pressure stabilizing device and the flame arrester in sequence, and then enters the mixed gas nozzle in the furnace.

[0052] (4) The induced draft fan distributes air to the gas mixing nozzles inside the furnace;

[0053] (5) The mixed gas and air are mixed and burned at the mixed gas nozzle.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A co-combustion system for natural gas coupled with biomass fuel gas in a furnace, characterized in that, It includes a filtration device, a pressure regulating device, a purification device, a first pressure stabilizing device, a gas mixing device, a second pressure stabilizing device, a flame arrester, a furnace, and an induced draft fan; The gas mixing device, the second pressure stabilizing device, the flame arrester, and the furnace are connected in sequence via pipelines. The furnace is equipped with a number of mixed gas nozzles, which are arranged regularly, and each of the mixed gas nozzles is connected to the flame arrester; the furnace is also equipped with at least one combustion temperature detection device, which is fixedly installed in front of the mixed gas nozzles. Each of the mixed gas nozzles is connected to the induced draft fan; The filtration device is connected to the pressure regulating device, and the pressure regulating device is connected to the natural gas inlet of the gas mixing device; The purification device is connected to the first pressure stabilizing device, and the first pressure stabilizing device is connected to the biomass gas inlet of the gas mixing device.

2. The co-combustion system for natural gas coupled with biomass fuel gas in a furnace according to claim 1, characterized in that, Several of the mixed gas nozzles are arranged in two rows, and a combustion temperature detection device is provided in front of each row of mixed gas nozzles.

3. The co-combustion system for natural gas coupled with biomass fuel gas in a furnace according to claim 1, characterized in that, The inlet of the filter device is connected to a medium-pressure natural gas pipeline, and an on / off valve and an emergency shut-off valve are sequentially installed between the medium-pressure natural gas pipeline and the filter device.

4. The co-combustion system for natural gas coupled with biomass fuel gas in a furnace according to claim 1, characterized in that, The inlet of the purification device is connected to the biomass gas pipeline, and an on / off valve and an emergency shut-off valve are sequentially installed between the biomass gas pipeline and the purification device.

5. The co-combustion system for natural gas coupled with biomass fuel gas in a furnace according to claim 1, characterized in that, A first electric regulating valve is provided between the pressure regulating device and the gas mixing device; A second electric regulating valve is provided between the first pressure stabilizing device and the gas mixing device.

6. The co-combustion system for natural gas coupled with biomass fuel gas in a furnace according to claim 1, characterized in that, The outlet pressure of the pressure regulating device is stabilized at 2000-3000 Pa.

7. The co-combustion system for natural gas coupled with biomass fuel gas in a furnace according to claim 1, characterized in that, The outlet pressure of the first pressure stabilizing device is stabilized at 500-1500 Pa, and the outlet pressure of the second pressure stabilizing device is stabilized at 1500-2000 Pa.

8. The co-combustion system for natural gas coupled with biomass fuel gas in a furnace according to claim 1, characterized in that, The induced draft fan is a variable frequency fan.

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