Starch cooking gas cleaning treatment system

Abstract

The invention discloses a starch cooking gas cleaning treatment system, and belongs to the technical field of papermaking. Comprising a pipeline into which starch cooking gas can be introduced, and a primary gas filter, a gas liquefaction cooling unit and a cyclone gas-water separator are sequentially arranged on the pipeline in the flowing direction of the starch cooking gas; a liquid discharge port and a gas discharge port are formed in the cyclone type gas-water separator; the liquid discharge port is connected into the biological filter through a water pipe, and a liquid filter is arranged on the water pipe; the gas discharge port is sequentially connected into the physical filter and the washing tower through gas pipes, and a secondary gas filter is arranged on the gas pipe between the gas discharge port and the physical filter; according to the cleaning treatment system for the starch cooking gas, various impurities contained in the starch cooking gas can be treated through physical, chemical and biological means, the starch cooking gas can be deeply treated, and the purified gas can meet the environmental protection requirement.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking, and in particular relates to a starch cooking gas cleaning treatment system. Background Art

[0002] In the papermaking process, in order to prepare the sizing starch solution, the starch solution is usually cooked to make it gelatinized. In the process of cooking the starch solution, a large amount of gas containing impurities and harmful substances will be produced. If these gases are directly discharged into the atmosphere, they will cause serious pollution to the environment. Therefore, before discharging the starch cooking gas, the starch cooking gas is usually purified. However, the existing starch cooking gas treatment method is relatively simple and cannot deeply purify the harmful substances contained in the cooking gas. It is difficult to meet the discharge conditions, and there are problems such as low treatment efficiency and unsatisfactory effect, which makes it difficult to meet the increasingly stringent environmental protection requirements.

[0003] Therefore, there is an urgent need for a starch cooking gas cleaning treatment system that can efficiently and deeply purify starch cooking gas. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a starch cooking gas cleaning treatment system that can treat various impurities contained in starch cooking gas by physical, chemical and biological means, and can deeply treat starch cooking gas so that the purified gas can meet environmental protection requirements.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a starch cooking gas cleaning treatment system, comprising a pipeline capable of accessing starch cooking gas, wherein a primary gas filter, a gas liquefaction cooling unit, and a cyclone gas-water separator are sequentially arranged along the flow direction of the starch cooking gas on the pipeline; Wherein, the cyclone type gas-water separator is provided with a liquid discharge port and a gas discharge port; The liquid discharge port is connected to the biological filter tank through a water pipe, and a liquid filter is arranged on the water pipe; the gas discharge port is connected to the physical filter and the washing tower in sequence through an air pipe, and a secondary gas filter is arranged on the air pipe between the gas discharge port and the physical filter.

[0006] Optionally, the gas liquefaction cooling unit includes a compressor, an expander, a throttle valve and a heat exchanger arranged on the pipeline, and the compressor is used to compress and drive the starch cooking gas in the pipeline to pass through the expander, the throttle valve and the heat exchanger.

[0007] Optionally, a microbial community and a nutrient solution are provided in the biofilter, and the nutrient solution forms an internal circulation in the biofilter.

[0008] Optionally, the washing liquid introduced into the washing tower is a chemical reagent, and the chemical reagent can react with harmful substances in the starch cooking gas.

[0009] Optionally, the physical filter is provided with activated carbon, ceramic particles and gauze.

[0010] Optionally, the primary gas filter is a coarse-efficiency air filter, and the secondary gas filter is a medium-efficiency air filter.

[0011] Optionally, an exhaust port is provided at the output end of the material filter.

[0012] Optionally, an ultraviolet lamp is provided at the exhaust port.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: starch cooking gas can be collected and connected to the pipeline, most of the large particle impurities can be removed when the starch cooking gas passes through the primary gas filter, and part of the starch cooking gas can be cooled and liquefied when passing through the gas liquefaction cooling unit, producing a certain amount of condensed water. Subsequently, the starch cooking gas and the condensed water will be discharged separately after passing through the cyclone gas-water separator; wherein, the starch cooking gas that cannot be liquefied will enter the physical filter and the washing tower in turn, and the odor and harmful substances in the starch cooking gas, such as hydrogen sulfide, methyl mercaptan, dimethyl sulfide and dimethyl disulfide, will be precipitated or adsorbed through physical and chemical reactions. The washing tower is a prior art and can wash the starch cooking gas many times and repeatedly. Subsequently, the condensed water produced by the liquefaction of starch cooking gas will be filtered through a liquid filter to remove some impurities, and then the condensed water passed into the biological filter will be purified of impurities through biological treatment. The starch cooking gas cleaning treatment system in this technical solution can treat various impurities contained in the starch cooking gas through physical, chemical and biological means, and can deeply treat the starch cooking gas so that the purified gas can meet environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the flow of a starch cooking gas cleaning treatment system in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention will now be further described in detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, the directional indication is only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Unless otherwise clearly specified and defined, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] like Figure 1 As shown, a starch cooking gas cleaning treatment system includes a pipeline that can be connected to the starch cooking gas, and a primary gas filter, a gas liquefaction cooling unit, and a cyclone gas-water separator are sequentially arranged along the flow direction of the starch cooking gas on the pipeline; Wherein, the cyclone type gas-water separator is provided with a liquid discharge port and a gas discharge port; The liquid discharge port is connected to the biological filter tank through a water pipe, and a liquid filter is arranged on the water pipe; the gas discharge port is connected to the physical filter and the washing tower in sequence through an air pipe, and a secondary gas filter is arranged on the air pipe between the gas discharge port and the physical filter.

[0019] Specifically, the starch cooking gas can be collected and connected to the pipeline. When the starch cooking gas passes through the primary gas filter, most of the large particle impurities can be removed. When the starch cooking gas passes through the gas liquefaction cooling unit, it can be cooled to about 30°C and produce a certain amount of condensed water. Then, the starch cooking gas and condensed water will be discharged separately after passing through the cyclone gas-water separator; among them, the starch cooking gas that cannot be liquefied will enter the physical filter and the washing tower in turn, and the odor and harmful substances in the starch cooking gas, such as hydrogen sulfide, methyl mercaptan, dimethyl sulfide and dimethyl disulfide, will be precipitated or adsorbed through physical and chemical reactions. The washing tower is an existing technology and can wash the starch cooking gas many times and repeatedly. Subsequently, the condensed water produced by the liquefaction of starch cooking gas will be filtered through a liquid filter to remove some impurities, and then the condensed water passed into the biological filter will be purified of impurities through biological treatment. The starch cooking gas cleaning treatment system in this technical solution can treat various impurities contained in the starch cooking gas through physical, chemical and biological means, and can deeply treat the starch cooking gas so that the purified gas can meet environmental protection requirements.

[0020] As shown in Figure 1, the gas liquefaction cooling unit includes a compressor, an expander, a throttle valve and a heat exchanger arranged on the pipeline. The compressor is used to compress and drive the starch cooking gas in the pipeline through the expander, the throttle valve and the heat exchanger. The compressor, the expander, the throttle valve and the heat exchanger are all existing technologies. The expander can reduce the temperature of the starch cooking gas and promote the liquefaction of the starch cooking gas; the heat exchanger can recover the heat in the starch cooking gas and save energy; the throttle valve can accurately control the flow and buffer the pressure brought by the starch cooking gas.

[0021] The above, such as Figure 1 As shown, a microbial community and a nutrient solution are provided in the biofilter, and the nutrient solution forms an internal circulation in the biofilter to ensure the stability and safety of the microbial community. In this technical solution, microorganisms can effectively degrade organic matter and harmful substances in condensed water without causing secondary pollution. The nutrient solution uses a safe and environmentally friendly nutrient solution, which can effectively avoid harm to microorganisms.

[0022] As mentioned above, the washing liquid introduced into the washing tower is a chemical reagent, which can react with harmful substances in the starch cooking gas. The chemical reagent includes sodium hydroxide, sodium hypochlorite, hydrogen peroxide, etc.

[0023] like Figure 1 As shown, the physical filter is provided with activated carbon, ceramic particles and gauze, which can absorb the odor in the starch cooking gas.

[0024] Furthermore, the gas filter is a coarse-efficiency air filter, and the secondary gas filter is a medium-efficiency air filter.

[0025] Furthermore, an exhaust port is provided at the output end of the material filter, and an ultraviolet lamp is provided at the exhaust port.

[0026] Working principle: Starch cooking gas can be collected and connected to the pipeline. When the starch cooking gas passes through the primary gas filter, most of the large particle impurities can be removed. When the starch cooking gas passes through the gas liquefaction cooling unit, it can be cooled to about 30°C and produce a certain amount of condensed water. Then, the starch cooking gas and condensed water will be discharged separately after passing through the cyclone gas-water separator; among them, the starch cooking gas that cannot be liquefied will enter the physical filter and the washing tower in turn, and the odor and harmful substances in the starch cooking gas, such as hydrogen sulfide, methyl mercaptan, dimethyl sulfide and dimethyl disulfide, will be precipitated or adsorbed through physical and chemical reactions. The washing tower is an existing technology and can wash the starch cooking gas repeatedly. Subsequently, the condensed water produced by the liquefaction of the starch cooking gas will be filtered through a liquid filter to remove some impurities, and then the condensed water passed into the biological filter will be purified by biological treatment.

[0027] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A starch cooking gas cleaning treatment system, characterized in that: It comprises a pipeline that can be connected to starch cooking gas, and a primary gas filter, a gas liquefaction cooling unit, and a cyclone gas-water separator are sequentially arranged on the pipeline along the flow direction of the starch cooking gas; Wherein, the cyclone type gas-water separator is provided with a liquid discharge port and a gas discharge port; The liquid discharge port is connected to the biological filter tank through a water pipe, and a liquid filter is arranged on the water pipe; the gas discharge port is connected to the physical filter and the washing tower in sequence through an air pipe, and a secondary gas filter is arranged on the air pipe between the gas discharge port and the physical filter.

2. The starch cooking gas cleaning treatment system according to claim 1, characterized in that: The gas liquefaction cooling unit includes a compressor, an expander, a throttle valve and a heat exchanger arranged on the pipeline. The compressor is used to compress and drive the starch cooking gas in the pipeline to pass through the expander, the throttle valve and the heat exchanger.

3. The starch cooking gas cleaning treatment system according to claim 1, characterized in that: Microbial communities and nutrient solution are arranged in the biofilter, and the nutrient solution forms an internal circulation in the biofilter.

4. The starch cooking gas cleaning treatment system according to claim 1, characterized in that: The washing liquid introduced into the washing tower is a chemical reagent, and the chemical reagent can react with harmful substances in the starch cooking gas.

5. The starch cooking gas cleaning treatment system according to claim 1, characterized in that: The physical filter is provided with activated carbon, ceramic particles and gauze.

6. The starch cooking gas cleaning treatment system according to claim 1, characterized in that: The gas filter is a coarse-efficiency air filter, and the secondary gas filter is a medium-efficiency air filter.

7. The starch cooking gas cleaning treatment system according to claim 1, characterized in that: The output end of the material filter is provided with an exhaust port.

8. The starch cooking gas cleaning treatment system according to claim 1, characterized in that: An ultraviolet lamp is arranged at the exhaust port.

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