Solid fuel combustion supply system and method

Abstract

The invention discloses a solid fuel combustion supply method which comprises the following steps: S1, drying: primarily mashing solid fuel, and drying; s2, crushing: preparing the solid fuel into powder with certain fineness, adding a combustion improver, and mixing to obtain a mixed raw material A; s3, secondary mixing: adding an additive and a penetrant into the raw material A to obtain a mixed raw material B; s4, cyclone combustion: enabling the mixed raw material B to enter the furnace along with air along the tangential direction of the inner wall of the cyclone furnace to perform high-speed rotating motion together, and rapidly completing combustion reaction under the action of centrifugal force; and S5, suspension combustion supporting is conducted, specifically, the pulverized coal is driven by primary air to be sprayed into the hearth space of the pulverized coal furnace through a spray burner to be combusted in a suspension mode. In the step S2, the combustion improver takes manganese dioxide and furfural residues as catalysts, and the weight ratio of manganese dioxide to furfural residues is 3: 7. The combustion efficiency can be improved, energy is fully utilized, waste heat loss is avoided, and waste heat is effectively recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel combustion methods, and in particular to a solid fuel combustion supply system and method. Background Art

[0002] Solid fuel refers to solid combustible materials that can generate heat or power, most of which contain carbon or hydrocarbons. Solid fuels can be divided into two categories: natural and processed. Natural solid fuels include wood, peat, lignite, bituminous coal, anthracite and oil shale, while processed solid fuels include charcoal, coke, briquettes, coal balls, etc. In addition, there are some special types of solid fuels, such as solid alcohol, solid gasoline and solid rocket fuel.

[0003] Solid fuels are characterized by being difficult to control in combustion, relatively low in efficiency, and producing more ash after combustion. However, they also have some unique advantages, such as being easy to store and transport. Solid fuels are widely used due to their portability and efficiency, so there is still much room for the use of solid fuels. To this end, we have invented a solid fuel combustion supply system and method. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a solid fuel combustion supply system and method.

[0005] A solid fuel combustion supply method proposed by the present invention comprises the following steps: S1: Drying: preliminarily crushing the solid fuel and drying it; S2: crushing the solid fuel into powder of a certain fineness, adding a combustion aid and mixing to obtain a mixed raw material A; S3: secondary mixing, adding additives and penetrants to raw material A to obtain mixed raw material B; S4: Cyclone combustion, the mixed raw material B is introduced into the furnace along the tangent direction of the inner wall of the cyclone furnace with the air, and the mixed raw material B is rotated at high speed together, and the combustion reaction is quickly completed by the centrifugal force; S5: Suspended combustion. Driven by the primary air, the pulverized coal is sprayed into the furnace space of the pulverized coal furnace through the burner and burns in a suspended state. Due to the introduction of oxygen, it is conducive to full combustion.

[0006] Preferably, in the above step S2, the combustion aid is manganese dioxide and furfural residue as a catalyst, and the weight ratio is 3:7.

[0007] Preferably, in the above step S3, the catalyst of the additive is composed of urea nitrate, lithium carbonate, and sodium copper chlorophyllin, accounting for 5-15%, and the penetrant is small molecule water, accounting for 85-95%, so that the mixed raw material B is fully burned, waste is avoided, and environmental pollution is reduced.

[0008] In the present invention, the water vapor generated by the above S5 is used as a combustion additive, and the inherent conditions of the steam boiler are utilized. By recycling the waste heat steam, the waste heat steam used for production is input into the lower part of the coal through a pipeline, so that the waste heat steam is output.

[0009] A solid fuel combustion supply system, comprising: a combustor comprising at least two injection stages each configured to inject fuel into a combustion chamber of the combustor; A gas turbine, wherein the gas turbine comprises a gas turbine combustion system, a steam turbine, and a heat recovery steam generator disposed between the gas turbine and the steam turbine and fluidically connected to the gas turbine and the steam turbine. The heat recovery steam generator of the gas turbine and the steam turbine is used, the generated water vapor is used as a combustion additive, the inherent conditions of the steam boiler are utilized, and the method of recycling and utilizing waste heat steam is used to input the waste heat steam used for production into the lower part of the coal-fired power plant through a pipeline, so that the waste heat steam is output, the energy is fully utilized, the waste heat loss is avoided, and the waste heat is effectively recovered.

[0010] Preferably, the at least two injection stages are axially spaced from each other relative to an axial centreline of the combustor.

[0011] The beneficial effects of the present invention are: In the present invention, solid fuel is made into powder with a certain fineness, and a combustion aid is added to mix to obtain a mixed raw material A. Additives and penetrants are added to the raw material A to obtain a mixed raw material B. Cyclone combustion is performed, and the mixed raw material B is introduced into the furnace along the tangent direction of the inner wall of the cyclone furnace along with the air to perform high-speed rotation motion together, and the combustion reaction is quickly completed by centrifugal force. Suspended combustion is performed, and the pulverized coal is sprayed into the furnace space of the pulverized coal furnace through the burner driven by the primary air to be suspended and burned, so as to optimize the supply mode of the combination of fuel, suspended combustion and cyclone combustion, such as increasing the contact area between oxygen and fuel, and having a sufficiently large contact area between fuel and air, which can improve the combustion efficiency. In the present invention, a heat recovery steam generator of a gas turbine and a steam turbine is utilized, the generated water vapor is utilized as a combustion additive, the inherent conditions of the steam boiler are utilized, and a method of recycling waste heat steam is used to input the waste heat steam used for production into the lower part of the coal-fired fuel through a pipeline, so that the waste heat steam is output, energy is fully utilized, waste heat loss is avoided, and waste heat is effectively recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A flow chart of a solid fuel combustion supply method proposed by the present invention; Figure 2 This is a structural diagram of a solid fuel combustion supply system proposed by the present invention. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0014] Reference Figure 1-2 , a solid fuel combustion supply method, comprising the following steps: S1: Drying: preliminarily crushing the solid fuel and drying it; S2: crushing the solid fuel into powder of a certain fineness, adding a combustion aid and mixing to obtain a mixed raw material A; S3: secondary mixing, adding additives and penetrants to raw material A to obtain mixed raw material B; S4: Cyclone combustion, the mixed raw material B is introduced into the furnace along the tangent direction of the inner wall of the cyclone furnace with the air, and the mixed raw material B is rotated at high speed together, and the combustion reaction is quickly completed by the centrifugal force; S5: Suspended combustion. Driven by the primary air, the pulverized coal is sprayed into the furnace space of the pulverized coal furnace through the burner and burns in a suspended state. Due to the introduction of oxygen, it is conducive to full combustion.

[0015] In the present invention, in the above step S2, the combustion aid is manganese dioxide and furfural residue as a catalyst, and the weight ratio is 3:7.

[0016] In the present invention, in the above step S3, the catalyst of the additive is composed of urea nitrate, lithium carbonate, and sodium copper chlorophyllin, accounting for 5-15%, and the penetrant is small molecule water, accounting for 85-95%, so that the mixed raw material B is fully burned, waste is avoided, and environmental pollution is reduced.

[0017] In the present invention, the water vapor generated by the above S5 is used as a combustion additive, and the inherent conditions of the steam boiler are utilized. By recycling the waste heat steam, the waste heat steam used for production is input into the lower part of the coal through a pipeline, so that the waste heat steam is output.

[0018] A solid fuel combustion supply system, comprising: a combustor comprising at least two injection stages each configured to inject fuel into a combustion chamber of the combustor; A gas turbine, wherein the gas turbine comprises a gas turbine combustion system, a steam turbine, and a heat recovery steam generator disposed between the gas turbine and the steam turbine and fluidically connected to the gas turbine and the steam turbine. The heat recovery steam generator of the gas turbine and the steam turbine is used, the generated water vapor is used as a combustion additive, the inherent conditions of the steam boiler are utilized, and the method of recycling and utilizing waste heat steam is used to input the waste heat steam used for production into the lower part of the coal-fired power plant through a pipeline, so that the waste heat steam is output, the energy is fully utilized, the waste heat loss is avoided, and the waste heat is effectively recovered.

[0019] In the present invention, the at least two injection stages are axially spaced apart from each other relative to the axial centerline of the combustor.

[0020] In the present invention, solid fuel is made into powder with a certain fineness, a combustion-supporting agent is added and mixed to obtain a mixed raw material A, additives and a penetrant are added to the raw material A to obtain a mixed raw material B, and cyclone combustion is performed, and the mixed raw material B is introduced into the furnace along the tangent direction of the inner wall of the cyclone furnace along with the air to perform high-speed rotation motion, and the combustion reaction is quickly completed by centrifugal force, and the suspended combustion is performed. The pulverized coal is injected into the furnace space of the pulverized coal furnace through the burner driven by the primary air and is burned in a suspended state, so as to optimize the supply mode of the combination of fuel, suspended combustion and cyclone combustion, such as increasing the contact area between oxygen and fuel, and having a sufficiently large contact area between fuel and air, which can improve the combustion efficiency; In the present invention, a heat recovery steam generator of a gas turbine and a steam turbine is utilized, the generated water vapor is utilized as a combustion additive, the inherent conditions of the steam boiler are utilized, and a method of recycling waste heat steam is used to input the waste heat steam used for production into the lower part of the coal-fired fuel through a pipeline, so that the waste heat steam is output, energy is fully utilized, waste heat loss is avoided, and waste heat is effectively recovered.

[0021] 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.

Claims

1. A solid fuel combustion supply method, characterized in that: The following steps are involved: S1: Drying: preliminarily crushing the solid fuel and drying it; S2: crushing the solid fuel into powder of a certain fineness, adding a combustion aid and mixing to obtain a mixed raw material A; S3: secondary mixing, adding additives and penetrants to raw material A to obtain mixed raw material B; S4: Cyclone combustion, the mixed raw material B is introduced into the furnace along the tangent direction of the inner wall of the cyclone furnace with the air, and the mixed raw material B is rotated at high speed together, and the combustion reaction is quickly completed by the centrifugal force; S5: Suspended combustion-assisted, the pulverized coal is sprayed into the furnace space of the pulverized coal furnace through the burner driven by the primary air and burns in a suspended state.

2. A solid fuel combustion supply method according to claim 1, characterized in that: In the above step S2, the combustion aid is manganese dioxide and furfural residue as a catalyst, with a weight ratio of 3:

7.

3. A solid fuel combustion supply method according to claim 1, characterized in that: In the above step S3, the catalyst of the additive is composed of urea nitrate, lithium carbonate, and sodium copper chlorophyllin, accounting for 5-15%, and the penetrant is small molecule water, accounting for 85-95%.

4. A solid fuel combustion supply method according to claim 1, characterized in that: The water vapor produced by the above S5 is used as a combustion additive, and the inherent conditions of the steam boiler are utilized. By recycling the waste heat steam, the waste heat steam used for production is input into the lower part of the coal through a pipeline, so that the waste heat steam is output.

5. A solid fuel combustion supply system according to claim 1, characterized in that: include: a combustor comprising at least two injection stages each configured to inject fuel into a combustion chamber of the combustor; A gas turbine includes a gas turbine combustion system, a steam turbine, and a heat recovery steam generator disposed between and fluidly coupled to the gas turbine and the steam turbine.

6. A solid fuel combustion supply system according to claim 5, characterized in that: The at least two injection stages are axially spaced from one another relative to an axial centerline of the combustor.

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