Method and system for incineration treatment of organic acid wood vinegar with heat energy recovery

Abstract

The present invention provides a method and system for incinerating wood vinegar containing organic acids while also recovering heat energy. The method comprises the following steps: 1) starting a vertical incinerator for incineration; 2) maintaining the combustion temperature of the vertical incinerator within a range of 700°C to 1000°C; 3) passing the wood vinegar containing organic acids produced in a biomass gasification system into a heat exchanger disposed on the smoke duct of the vertical incinerator; wherein the flue gas generated during the combustion process in the vertical incinerator, as it passes through the smoke duct, can exchange heat with the wood vinegar in the heat exchanger, thereby converting the wood vinegar in the heat exchanger into high-temperature steam; and 4) directing the high-temperature steam into the vertical incinerator for incineration, thereby completely incinerating the organic acids contained in the high-temperature steam and completing the harmless treatment of the wood vinegar containing organic acids. The present invention has the advantages of high incineration efficiency and significant energy-saving effects.

Description

Technical Field

[0001] The invention belongs to the technical field of incineration, and in particular relates to a method and a system for incinerating organic acid wood vinegar and recovering heat energy. Background Art

[0002] Biomass gasification furnaces produce fuel gas from crop straw, forestry waste, and other sources. This fuel gas is a green, renewable energy source with strong vitality, renewable properties, low pollution, and widespread distribution. Using biomass as an alternative energy source is crucial for reducing carbon emissions, mitigating the greenhouse effect, and improving atmospheric acid rain. A biomass gasification system utilizes biomass in a closed, oxygen-deficient combustion furnace. Through dry distillation, pyrolysis, and thermochemical oxidation, combustible gas is produced, along with biomass tar and wood vinegar. After separation, the biomass tar and wood vinegar must be processed separately.

[0003] Wood vinegar pollutes the environment and cannot be discharged directly. Conventional methods for treating wood vinegar involve burning it, which, after complete combustion, primarily produces carbon dioxide, which can be discharged directly. However, conventional combustion methods are prone to incomplete combustion, resulting in the discharge of organic acids that are not completely burned. Furthermore, conventional combustion methods consume a large amount of energy, resulting in low energy utilization and excessive energy waste. Summary of the Invention

[0004] In view of the defects of the prior art, the present invention provides a method and system for incinerating wood vinegar containing organic acid and recovering heat energy, which has the advantages of high incineration efficiency and significant energy saving effect.

[0005] In order to achieve the above object, the first aspect of the present invention provides a method for incinerating wood vinegar containing organic acid and recovering heat energy, which comprises the following steps:

[0006] 1) Start the vertical incinerator for incineration;

[0007] 2) Maintain the combustion temperature range of the vertical incinerator at 700℃~1000℃;

[0008] 3) passing the wood vinegar containing organic acid produced in the biomass gasification system into a heat exchanger arranged on the smoke pipe of the vertical incinerator; wherein the flue gas generated during the combustion process of the vertical incinerator can exchange heat with the wood vinegar in the heat exchanger when passing through the smoke pipe, so that the wood vinegar in the heat exchanger is converted into high-temperature steam;

[0009] 4) directing the high-temperature steam to the vertical incinerator for incineration, so that the organic acid contained in the high-temperature steam is completely incinerated to complete the harmless treatment of the wood vinegar containing the organic acid.

[0010] According to another specific embodiment of the present invention, the temperature of the high-temperature steam directed from the heat exchanger to the vertical incinerator is above 100°C.

[0011] According to another specific embodiment of the present invention, after heat exchange with the wood vinegar in the heat exchanger, the temperature of the flue gas discharged from the vertical incinerator is reduced to 300° C. or below.

[0012] According to another specific embodiment of the present invention, the heat exchanger provided on the smoke pipe has multiple stages to perform continuous heat exchange.

[0013] According to another specific embodiment of the present invention, the pressure of the high-temperature steam directed into the vertical incinerator is controlled to be below 20 kPa.

[0014] According to another specific embodiment of the present invention, the flow rate of the high-temperature steam directed to the vertical incinerator is controlled to be 2-4 m / s to achieve sufficient incineration of the high-temperature steam.

[0015] A second aspect of the present invention is to provide a system for implementing the above-mentioned method of incinerating the organic acid wood vinegar and recovering heat energy, the system comprising:

[0016] A vertical incinerator, comprising a furnace at the bottom and a smoke pipe directly above the furnace, wherein the furnace has a combustion chamber provided with a steam inlet;

[0017] a burner, disposed in the combustion chamber;

[0018] A heat exchanger is arranged around the smoke pipe, and a steam outlet is provided on the top of the heat exchanger;

[0019] a flow guide pipe connected between the steam inlet and the steam outlet;

[0020] The wood vinegar introduced into the heat exchanger is heat-exchanged with the flue gas generated by the combustion of the burner through the smoke pipe, so that the wood vinegar forms high-temperature steam; the high-temperature steam flows into the combustion chamber through the guide pipe for incineration, thereby completing the harmless treatment of the wood vinegar containing organic acid.

[0021] According to another specific embodiment of the present invention, the number of the heat exchangers is two or more, and the two or more heat exchangers are arranged in sequence from bottom to top, and different heat exchangers are connected to each other.

[0022] According to another specific embodiment of the present invention, the steam inlet is provided corresponding to the burner, and the flame of the burner directly acts on the high-temperature steam flowing into the combustion chamber through the steam inlet.

[0023] According to another specific embodiment of the present invention, a safety pipe and a water level gauge are installed on the heat exchanger.

[0024] The present invention has the following beneficial effects:

[0025] In the present invention, heat exchange is performed between the flue gas generated by combustion in a vertical incinerator and the wood vinegar in a heat exchanger. On the one hand, the heat of the flue gas can be used to heat the wood vinegar while reducing the temperature of the flue gas itself, which is beneficial for subsequent discharge. On the other hand, the wood vinegar is converted into high-temperature steam. Compared with the solution of directly incinerating the wood vinegar, energy can be effectively saved, and the organic acid contained in the high-temperature steam can be completely burned, thereby achieving harmless treatment. The present method has the advantages of high incineration efficiency and significant energy-saving effect.

[0026] The present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the system of Example 1 of the present invention. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0030] Example 1

[0031] This embodiment provides a method for incinerating wood vinegar containing organic acids and recovering heat energy, which is used to treat wood vinegar containing organic acids produced in a biomass gasification system, and includes the following steps:

[0032] 1) Start the vertical incinerator for incineration;

[0033] 2) Maintain the combustion temperature of the vertical incinerator in the range of 700°C to 1000°C, for example, 800°C;

[0034] 3) passing the wood vinegar containing organic acid produced in the biomass gasification system into a heat exchanger arranged on the smoke pipe of the vertical incinerator; wherein the flue gas generated during the combustion process of the vertical incinerator can exchange heat with the wood vinegar in the heat exchanger when passing through the smoke pipe, so that the wood vinegar in the heat exchanger is converted into high-temperature steam; wherein the heat exchanger on the smoke pipe can be multiple to form a multi-stage continuous heat exchange effect;

[0035] 4) directing the high-temperature steam to the vertical incinerator for incineration, so that the organic acid contained in the high-temperature steam is completely incinerated to complete the harmless treatment of the wood vinegar containing the organic acid.

[0036] Specifically, the temperature of the high-temperature steam directed from the heat exchanger to the vertical incinerator is above 100°C; preferably, the temperature of the high-temperature steam directed from the heat exchanger to the vertical incinerator is in the range of 150°C to 200°C, which can not only achieve efficient heat exchange, but also facilitate subsequent incineration treatment of the high-temperature steam.

[0037] Furthermore, after heat exchange with the wood vinegar in the heat exchanger, the temperature of the flue gas discharged from the vertical incinerator is reduced to 300°C or below. For example, the temperature of the flue gas discharged from the vertical incinerator is about 200°C.

[0038] Among them, the pressure value of the high-temperature steam diverted to the vertical incinerator is controlled to be below 20kPa, for example, the pressure value of the high-temperature steam diverted to the vertical incinerator is 10kPa, and at the same time, the flow rate of the high-temperature steam diverted to the vertical incinerator is controlled to be 2-4m / s, for example, the flow rate of the high-temperature steam diverted to the vertical incinerator is 3m / s, so as to coordinately realize the orderly supply of high-temperature steam and ensure that the high-temperature steam is completely incinerated.

[0039] In the above method of this embodiment, the flue gas generated by the combustion of the vertical incinerator is heat exchanged with the wood vinegar in the heat exchanger, thereby utilizing the heat energy on the one hand, heating the wood vinegar to form high-temperature steam, and achieving complete incineration of the high-temperature steam on the other hand, thereby having the advantages of significant energy saving effect and high incineration efficiency.

[0040] This embodiment also provides a system for realizing the above-mentioned incineration treatment of organic acid wood vinegar and heat energy recovery method, such as Figure 1 As shown, the system includes a vertical incinerator 10 , a burner 20 , a heat exchanger 30 and a draft tube 40 .

[0041] The vertical incinerator 10 includes a furnace 11 at the bottom and a smoke pipe 12 directly above the furnace 11. The furnace 11 has a combustion chamber 13, the combustion chamber 13 is provided with a steam inlet 14, and a burner 20 is arranged in the combustion chamber 13; wherein the steam inlet 14 is arranged corresponding to the burner 20, and the flame of the burner 20 directly acts on the high-temperature steam flowing into the combustion chamber 13 through the steam inlet 14.

[0042] The heat exchanger 30 is arranged around the smoke pipe 12, and a steam outlet 31 is provided at the top of the heat exchanger 30. The guide pipe 40 is connected between the steam inlet 14 and the steam outlet 31. The wood vinegar entering the heat exchanger 30 is heat exchanged by the smoke pipe 12 to form high-temperature steam. The high-temperature steam flows into the combustion chamber 13 through the guide pipe 40 for incineration, thereby completing the harmless treatment of the wood vinegar containing organic acid.

[0043] In this embodiment, the smoke tube 12 has a longer length to provide a larger effective heat exchange area.

[0044] Specifically, the number of the heat exchangers 30 is two or more, and the two or more heat exchangers 30 are arranged sequentially from bottom to top, and different heat exchangers 30 are interconnected, for example, including two heat exchangers 30.

[0045] Furthermore, a safety pipe 32 and a water level gauge 33 are installed on the heat exchanger 30 .

[0046] In this embodiment, the flow rate and pressure of the high-temperature steam in the draft tube 40 can also be adjusted according to the conditions of the combustion chamber 13 to achieve more thorough combustion.

[0047] Any matters not mentioned above shall be subject to the existing technology.

[0048] Although the present invention is disclosed above with reference to preferred embodiments, this is not intended to limit the scope of the present invention. Any person skilled in the art may make slight modifications without departing from the scope of the present invention. In other words, any equivalent modifications made in accordance with the present invention should be included within the scope of the present invention.

Claims

1. A method for incinerating organic acid wood vinegar and recovering heat energy, characterized in that: The following steps are involved: 1) Start the vertical incinerator for incineration; 2) Maintain the combustion temperature of the vertical incinerator within the range of 700℃~1000℃; 3) Passing the wood vinegar containing organic acid produced in the biomass gasification system into a heat exchanger disposed on the smoke pipe of the vertical incinerator; wherein the flue gas generated during the combustion process in the vertical incinerator exchanges heat with the wood vinegar in the heat exchanger as it passes through the smoke pipe, thereby converting the wood vinegar in the heat exchanger into high-temperature steam; 4) directing the high-temperature steam to a vertical incinerator for incineration, so that the organic acid contained in the high-temperature steam is completely incinerated, thereby completing the harmless treatment of the wood vinegar containing organic acid.

2. The method for incinerating the organic acid wood vinegar as claimed in claim 1 and recovering heat energy, wherein: The temperature of the high-temperature steam directed from the heat exchanger to the vertical incinerator is above 100°C.

3. The method for incinerating the organic acid wood vinegar as claimed in claim 1 and recovering heat energy, wherein: After heat exchange with the wood vinegar in the heat exchanger, the temperature of the flue gas discharged from the vertical incinerator is reduced to 300°C or below.

4. The method for incinerating organic acid wood vinegar as claimed in claim 1 and recovering heat energy, wherein: The heat exchanger arranged on the smoke tube has multiple stages to perform continuous heat exchange.

5. The method for incinerating organic acid wood vinegar with heat recovery as claimed in claim 1, wherein: The pressure of the high-temperature steam directed into the vertical incinerator is controlled to be below 20 kPa.

6. The method for incinerating organic acid wood vinegar with heat recovery according to claim 1, wherein: The flow rate of the high-temperature steam directed to the vertical incinerator is controlled to be 2-4 m / s to ensure sufficient combustion of the high-temperature steam.

7. A system for realizing the method for incinerating wood vinegar containing organic acid and recovering heat energy according to any one of claims 1 to 6, characterized in that: The system comprises: A vertical incinerator, comprising a furnace at the bottom and a smoke pipe directly above the furnace, wherein the furnace has a combustion chamber provided with a steam inlet; a burner, disposed in the combustion chamber; A heat exchanger is arranged around the smoke pipe, and a steam outlet is provided on the top of the heat exchanger; a flow guide pipe connected between the steam inlet and the steam outlet; The wood vinegar introduced into the heat exchanger is heat-exchanged with the flue gas generated by the combustion of the burner through the smoke pipe, so that the wood vinegar forms high-temperature steam; the high-temperature steam flows into the combustion chamber through the guide pipe for incineration, thereby completing the harmless treatment of the wood vinegar containing organic acid.

8. The system according to claim 7, wherein: The number of the heat exchangers is two or more, and the two or more heat exchangers are arranged in sequence from bottom to top, and different heat exchangers are connected to each other.

9. The system according to claim 7, wherein: The steam inlet is arranged corresponding to the burner, and the flame of the burner directly acts on the high-temperature steam flowing into the combustion chamber through the steam inlet.

10. The system according to claim 7, wherein: A safety pipe and a water level gauge are installed on the heat exchanger.

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