Digestion furnace waste gas recovery system

Abstract

The utility model discloses a waste gas recovery system of a digestion furnace. The waste gas recovery system comprises a gas guide pipe, a filter bottle and a gas extraction piece, the air inlet end of the air guide pipe is connected with the air outlet end of the air guide cover, the air outlet end of the air guide pipe extends into the filter bottle, sodium hydroxide solution is contained in the filter bottle, the liquid level of the sodium hydroxide solution is lower than the mouth of the filter bottle, and the air outlet end of the air guide pipe extends into the sodium hydroxide solution; and the air exhaust piece is connected with a bottle mouth of the filter bottle. According to the SO2 waste gas treatment device, SO2 waste gas can be collected and treated, existing equipment cannot be damaged, water sources cannot be wasted, and products are free of pollution; the device is suitable for all scenes needing to collect and treat the generated SO2 waste gas.

Description

Technical Field

[0001] The utility model belongs to the field of food processing, in particular to a digestion furnace waste gas recovery system. Background Art

[0002] In food processing, the nutritional value of food is often evaluated by measuring the protein content. Taking milk powder production as an example, protein content is one of the important indicators for evaluating the quality of milk powder. The determination of protein content can determine whether the milk powder is adulterated. Protein needs to be pre-treated before detection, that is, the sample is digested with a catalyst and a digestion agent, and then the next step of detection is carried out after it is digested into a liquid state. The digestion process is: add digestion agents such as copper sulfate, potassium sulfate, and sulfuric acid to the sample, and digest it in a digestion furnace by heating. During the digestion heating process, the digestion agent reacts with the sample to generate SO2 waste gas. SO2 has a strong pungent odor and is severely corrosive, so the SO2 waste gas needs to be properly handled.

[0003] There are currently two ways to treat SO2 waste gas: 1. Add a funnel above the digestion tube to reduce the overflow of SO2 gas, and then use a fume hood to discharge the small amount of overflowed SO2 gas into the room. However, SO2 gas will cause serious corrosion to the fume hood, reducing the service life of the fume hood and increasing maintenance costs; 2. Connect an air hood to the digestion furnace, connect the air hood to the sewer, and open the tap water valve for dilution and discharge. In this method, the generated SO2 gas also has a significant corrosive effect on the sewer pipe, and the use of tap water for dilution also causes a waste of water resources. In addition, SO2 gas reacts with water to generate sulfurous acid, and the wastewater after the reaction needs to be treated later, which is costly. Utility Model Content

[0004] The utility model aims to provide a digestion furnace waste gas recovery system to solve the problems that when SO2 waste gas is treated in the existing method, SO2 gas will cause serious corrosion to the fume hood and the sewer pipe, waste water resources, and require further treatment of the sulfurous acid solution.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A digestion furnace waste gas recovery system comprises an air guide pipe, a filter bottle and an air extraction member; the air inlet end of the air guide pipe is connected to the air outlet end of the air guide cover, the air outlet end of the air guide pipe extends into the filter bottle, the filter bottle is filled with sodium hydroxide solution, the liquid level of the solution is lower than the mouth of the filter bottle, the air outlet end of the air guide pipe extends into the sodium hydroxide solution; the air extraction member is connected to the mouth of the filter bottle.

[0007] As a limitation of the utility model: a chemical indicator for judging the acidity or alkalinity of a solution is added into the filter bottle.

[0008] As a further limitation of the present invention: the chemical indicator is a methylene blue solution.

[0009] As another limitation of the present invention: the air extraction member is a vacuum pump, and an air extraction pipe is arranged between the vacuum pump and the mouth of the filter bottle.

[0010] As a further limitation of the present invention: the material of the airway tube is polytetrafluoroethylene.

[0011] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0012] (1) The utility model includes an air duct, a filter bottle and an exhaust component. The air duct is connected to the air duct cover on the digestion furnace, and the air outlet end of the air duct extends into the sodium hydroxide solution in the filter bottle. Under the action of the exhaust component, the SO2 waste gas generated in the digestion furnace smoothly enters the sodium hydroxide solution through the air duct for reaction. The SO2 waste gas is collected and treated through the neutralization reaction, which avoids corrosion of the fume hood and sewer pipes, and also saves water. In addition, the SO2 waste gas reacts with the sodium hydroxide solution to generate salt and water, and the products are pollution-free and do not need to be further treated.

[0013] (2) SO2 waste gas reacts with sodium hydroxide solution to generate salt and water. If the sodium hydroxide is consumed, SO2 will then react with water to generate sulfurous acid. Therefore, it is impossible to determine with the naked eye whether the sodium hydroxide solution in the filter bottle is sufficient to neutralize the sulfurous acid. For this reason, methylene blue solution is added to the filter bottle as a chemical indicator to determine the acidity and alkalinity of the solution. Under acidic conditions, methylene blue appears red; under neutral conditions, methylene blue appears blue; under alkaline conditions, methylene blue appears green. If the solution in the filter bottle appears red, it means that the solution is acidic, proving that the sodium hydroxide solution has been consumed. The sodium hydroxide solution can be replaced. This method can more accurately determine the progress of the neutralization reaction and ensure that the SO2 waste gas is treated more thoroughly.

[0014] In summary, the utility model can realize the collection and treatment of SO2 waste gas without damaging existing equipment, wasting water resources, and the product is pollution-free; the utility model is suitable for all scenarios where the generated SO2 waste gas needs to be collected and treated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the application structure of an embodiment of the utility model.

[0017] In the figure: 1-digestion furnace, 2-air guide tube, 3-filter bottle, 31-bottle mouth, 4-vacuum pump, 5-sodium hydroxide solution, 6-exhaust pipe. DETAILED DESCRIPTION

[0018] The preferred embodiment of the utility model is described below in conjunction with the accompanying drawings. It should be understood that the digestion furnace waste gas recovery system described here is a preferred embodiment, which is only used to illustrate and explain the utility model and does not constitute a limitation of the utility model.

[0019] like Figure 1 As shown, this embodiment includes an air guide pipe 2, a filter bottle 3 and a suction member, wherein the filter bottle 3 contains a sodium hydroxide solution 5. The suction member draws the SO2 waste gas generated in the digestion furnace 1 into the filter bottle 3 through the air guide pipe 2 to react with the sodium hydroxide solution 5, thereby realizing the collection and treatment of the SO2 waste gas.

[0020] The structure and installation of the digestion furnace 1 and the air guide hood are all prior art and will not be described in detail in this embodiment.

[0021] like Figure 1 As shown, the air inlet end of the air guide pipe 2 is connected to the air outlet end of the air guide cover, and the air outlet end of the air guide pipe 2 extends into the filter bottle 3. The filter bottle 3 has a bottle mouth 31, the liquid level of the sodium hydroxide solution 5 is located below the bottle mouth 31, and the air outlet end of the air guide pipe 2 extends into the sodium hydroxide solution 5. Since SO2 waste gas is corrosive, the air guide pipe 2 is made of polytetrafluoroethylene material, which has excellent corrosion resistance; since the digestion furnace 1 adopts a heating method for digestion, the temperature of the discharged SO2 waste gas is relatively high, and the polytetrafluoroethylene material also has high temperature resistance.

[0022] The vacuum pump 4 in the prior art is used as the vacuum pump 4, model AP-9925N. The vacuum port of the vacuum pump 4 is connected to the bottle mouth 31 of the filter bottle 3 through a vacuum pipe 6, and the vacuum pipe 6 here uses any hose in the prior art. When the vacuum pump 4 is working, the position above the liquid level in the filter bottle 3 is evacuated to form a vacuum, so that a negative pressure state is formed in the filter bottle 3, so that the SO2 waste gas can smoothly enter the filter bottle 3. Of course, the vacuum pump can also be replaced with a vacuum pump, as long as the inside of the filter bottle 3 can be evacuated to form a vacuum.

[0023] It should be noted that the air duct 2 extends below the liquid level of the sodium hydroxide solution 5, and the exhaust pipe 6 is connected to the bottle mouth 31, so the SO2 waste gas can only enter the sodium hydroxide solution 5 for neutralization reaction and will not be extracted from the filter bottle 3 by the exhaust pipe 6, thereby ensuring safety.

[0024] Furthermore, a chemical indicator for judging the acidity and alkalinity of the solution is added to the filter bottle 3. In this embodiment, the chemical indicator is a methylene blue solution in the prior art. Under acidic conditions, methylene blue appears red; under neutral conditions, methylene blue appears blue; under alkaline conditions, methylene blue appears green. Adding methylene blue facilitates the naked eye to better observe whether the neutralization reaction in the filter bottle 3 is continuing. For example, if the solution in the filter bottle 3 appears red, it means that the solution is acidic, proving that the sodium hydroxide solution 5 has been consumed, and the SO2 waste gas reacts with water to generate sulfurous acid, which makes the solution acidic. At this time, the sodium hydroxide solution 5 in the filter bottle 3 needs to be replaced.

[0025] Of course, the chemical indicator can also be replaced with other substances in the prior art, such as phenolphthalein, which is purple-red in alkaline solutions and colorless in acidic and neutral solutions. If the color in the filter bottle 3 changes from purple-red to colorless, it means that the sodium hydroxide solution 5 is consumed and needs to be replaced. The chemical indicator can ensure that the neutralization reaction continues to proceed, so as to treat the SO2 waste gas more thoroughly.

[0026] When using this embodiment, the vacuum pump 4 draws the filter bottle 3 into a negative pressure state, so that the SO2 waste gas can smoothly enter the sodium hydroxide solution 5 for neutralization reaction. The products after neutralization are salt and water, and the products are pollution-free; then by observing the color of the solution, it is known whether the neutralization reaction in the filter bottle 3 continues, and if the sodium hydroxide solution 5 is consumed, it is replaced. This system can effectively collect and treat the SO2 waste gas generated in the digestion furnace 1, avoiding the problems of corrosion of existing equipment and waste of water resources when treating SO2 waste gas in the prior art.

[0027] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiment, those skilled in the art can still modify the technical solutions recorded in the above embodiment or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A digestion furnace waste gas recovery system, characterized in that: It includes an air guide tube, a filter bottle and an air extraction component; the air inlet end of the air guide tube is connected to the air outlet end of the air guide cover, the air outlet end of the air guide tube extends into the filter bottle, the filter bottle is filled with sodium hydroxide solution, the liquid level of which is lower than the mouth of the filter bottle, and the air outlet end of the air guide tube extends into the sodium hydroxide solution; the air extraction component is connected to the mouth of the filter bottle.

2. The digestion furnace waste gas recovery system according to claim 1, characterized in that: A chemical indicator is added to the filter bottle to determine the acidity or alkalinity of the solution.

3. The digestion furnace waste gas recovery system according to claim 2, characterized in that: The chemical indicator is methylene blue solution.

4. The digestion furnace waste gas recovery system according to any one of claims 1 to 3, characterized in that: The air extraction component is a vacuum pump, and an air extraction pipe is arranged between the vacuum pump and the mouth of the filter bottle.

5. The digestion furnace waste gas recovery system according to claim 4, characterized in that: The material of the airway is polytetrafluoroethylene.

Images