Anaerobic fermentation tank sampling device

Abstract

The invention provides an anaerobic fermentation tank sampling device, and relates to the technical field of anaerobic fermentation tanks, the anaerobic fermentation tank sampling device comprises a fermentation tank, the fermentation tank is sequentially connected with a plurality of sampling pipes in a layered manner, each sampling pipe is provided with a sampling valve, the outlets of the sampling pipes are communicated with the same concentration pipe, the concentration pipe is communicated with a sample tank, and the sample tank is connected with a vacuum pump; the side of the fermentation tank is communicated with the sample tank, air in the sample tank is exhausted to form vacuum, so that a sample in the fermentation tank is pressed into the sample tank for sampling, the whole process can be performed in a sealed state, objects in the fermentation tank are prevented from being oxidized, meanwhile, the sample in the fermentation tank can be extracted by means of atmospheric pressure, and the sampling efficiency is improved. According to the invention, samples at different levels can be extracted for detection through the multi-layer sampling tube.

Description

Technical Field

[0001] The invention relates to the technical field of anaerobic fermentation tanks, in particular to a sampling device for anaerobic fermentation tanks. Background Art

[0002] The anaerobic fermentation tank is a sealed oxygen-free fermentation tank that can hold fermentable objects such as cow dung and straw. It can prevent oxygen from entering, speed up the aggregation and fermentation efficiency of objects, and save fermentation time.

[0003] Normally, the feed inlet of an anaerobic fermentation tank is located at the bottom. From the bottom up, it is usually divided into multiple zones: hydrolysis and acidification zone, anaerobic zone, mixing zone, and gas-liquid separation zone. The material composition and physical and chemical properties of each zone are slightly different. To take materials from different areas, it is necessary to punch holes in the wall of the anaerobic fermentation tank and weld small-diameter sampling tubes. The sampling tubes are used to take samples to check the internal fermentation conditions. If fermentation materials with high concentrations and different lengths, such as straw, are placed, the materials may block the sampling tube. If fermentation materials with high sand content, such as cow dung, are placed, the sampling port may also be blocked. In addition, the physical and chemical properties of the materials at the tank wall may be different from those near the center, and the sampling port cannot take out materials near the center.

[0004] At present, Chinese patent number CN107621382A discloses a fixed-point online sampling device for materials in an anaerobic fermentation tank, which can penetrate into any depth in the anaerobic fermentation tank, especially for fixed-point sampling near the central area. When the sampling device has not reached the specified position, the weight hammer hopper is closed. After reaching the specified position, the sliding plug is lifted by the pull rod for sampling. After sampling, the pull rod is pressed down to reclose the weight hammer hopper, and then the sampling device filled with materials is lifted out of the tank by the tank top operator. The whole process is carried out in a sealed state.

[0005] However, the technical solution provided in the prior art requires disassembling the top blind flange and inserting the sampling device during the sampling process, which may cause miscellaneous bacteria to enter the fermentation tank. At the same time, when placed in the fermentation tank, it needs to rely on gravity to sink from the top layer, which will dip into fermentations at different layers. The sampling time of the sampling device cannot be actively controlled, which affects the sampling efficiency and causes inconvenience. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an anaerobic fermentation tank sampling device to solve the problem of inconvenience in sampling the anaerobic fermentation tank.

[0007] Based on the technical problems existing in the background technology, the present invention proposes an anaerobic fermentation tank sampling device, including a fermentation tank, on which a plurality of sampling tubes are sequentially connected in layers, each sampling tube is provided with a sampling valve, and the outlets of the sampling tubes are connected to the same central tube, the central tube is connected to a sample tank, and the sample tank is connected to a vacuum pump.

[0008] Preferably, a flushing valve is installed at one end of the central pipe, and a drain valve is installed at the other end, and the position of the drain valve is lower than that of the flushing valve.

[0009] Preferably, a pressure gauge is installed on the sample tank.

[0010] Preferably, a vacuum inlet valve is installed between the sample tank and the vacuum pump.

[0011] Preferably, a sample outlet valve is provided at the bottom of the sample tank.

[0012] Preferably, before sampling, the vacuum pump is running, the vacuum inlet valve is opened, and the sample outlet valve, flushing valve, drain valve and sampling valve are closed.

[0013] Preferably, when sampling, the vacuum pump stops running, one of the sampling valves is opened, and the vacuum inlet valve, sample outlet valve, flushing valve, and drain valve are closed.

[0014] Preferably, when the sample tank is full, the sample outlet valve is opened, and the flushing valve, drain valve, sampling valve, and vacuum inlet valve are closed.

[0015] Preferably, after sampling, the vacuum pump stops running, the sample outlet valve, flushing valve and drain valve are opened, and the sampling valve and vacuum inlet valve are closed.

[0016] Preferably, the flushing valve is connected to a pressure device, a low-pressure steam device and a slightly positive-pressure nitrogen device.

[0017] Compared with the prior art, the anaerobic fermentation tank sampling device proposed in the present invention adopts the above technical solution to achieve the following technical effects:

[0018] The present invention connects the sample tank at the side of the fermentation tank, discharges the air in the sample tank to form a vacuum, and presses the sample in the fermentation tank into the sample tank for sampling. The present invention can be carried out in a sealed state throughout the process to avoid oxidation of objects in the fermentation tank. At the same time, the sample in the fermentation tank can be extracted with the help of atmospheric pressure. The present invention can extract samples at different levels for detection through multi-layer sampling tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structural connection of the present invention.

[0020] In the figure: 1. fermentation tank; 2. sampling tube; 21. sampling valve; 3. concentrating tube; 4. sample tank; 5. vacuum pump; 31. flushing valve; 32. drain valve; 41. pressure gauge; 51. vacuum inlet valve; 42. sample outlet valve. DETAILED DESCRIPTION

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] Example

[0024] Please refer to Figure 1 The present invention proposes an anaerobic fermentation tank sampling device, comprising a fermentation tank 1, on which a plurality of sampling tubes 2 are sequentially connected in layers, each sampling tube 2 is provided with a sampling valve 21, and the outlets of the sampling tubes 2 are all connected to the same central tube 3, the central tube 3 is connected to a sample tank 4, and the sample tank 4 is connected to a vacuum pump 5. The operation mode in the present invention is realized by vacuuming, and all valves connected to the sample tank 4 are preferentially closed, and only the vacuum pump 5 is connected to the sample tank 4, at which time the air in the sample tank 4 is extracted, so that the sample tank 4 is in a vacuum state, and at this time the valve between the sample tank 4 and the vacuum pump 5 is closed; in the present invention, there are a plurality of sampling tubes 2, which are all connected to the sample tank 4, and the sampling tubes 2 are connected to the sample tank 4 by controlling the sampling valves 21 on the sampling tubes 2, at this time, under the action of atmospheric pressure, the sample in the fermentation tank 1 can be squeezed into the sample tank 4, and at this time the sampling valve 21 is closed again to prevent the fermentation tank 1 from entering the air, resulting in an oxidation reaction in the fermentation tank 1, which affects the fermentation effect.

[0025] In a specific implementation manner, refer to Figure 1A flushing valve 31 is installed at one end of the central pipe 3, and a drain valve 32 is installed at the other end. The drain valve 32 is located lower than the flushing valve 31. The central pipe 3 is installed vertically, and the flushing valve 31 is installed at the upper end of the central pipe 3, and the drain valve 32 is installed at the lower end of the central pipe 3. When cleaning, the liquid or other flushing materials in the central pipe 3 can be discharged from top to bottom under the action of gravity; the flushing valve 31 can connect liquid or gaseous cleaning materials.

[0026] In a specific implementation manner, refer to Figure 1 A pressure gauge 41 is installed on the sample tank 4. On the sample tank 4, the pressure gauge 41 can be used to predict how much sample can be extracted from the sample tank 4, and the vacuum pressure in the sample tank 4 is controlled under the action of the vacuum pump 5, so as to control the amount of sample sucked into the sample tank 4.

[0027] In a specific implementation manner, refer to Figure 1 A vacuum inlet valve 51 is installed between the sample tank 4 and the vacuum pump 5 .

[0028] In a specific implementation manner, refer to Figure 1 A sample outlet valve 42 is provided at the bottom of the sample tank 4 for taking out the sample in the sample tank 4.

[0029] In a specific implementation manner, refer to Figure 1 Before sampling, the vacuum pump 5 is running, the vacuum inlet valve 51 is opened, and the sample outlet valve 42, the flushing valve 31, the drain valve 32 and the sampling valve 21 are closed. At this time, the vacuum pump 5 is only connected to the sample tank 4 to discharge the gas in the sample tank 4 and put it in a vacuum state.

[0030] In a specific implementation manner, refer to Figure 1 During sampling, the vacuum pump 5 stops running, one of the sampling valves 21 is opened, and the vacuum inlet valve 51, the sample outlet valve 42, the flushing valve 31, and the drain valve 32 are closed. At this time, the sample tank 4 is connected to the fermentation tank 1 only through a sampling tube 2, and the fermentation tank 1 will squeeze the sample closest to the sampling tube 2 into the sample tank 4.

[0031] In a specific implementation manner, refer to Figure 1 When the sample tank 4 is full, the sample outlet valve 42 is opened, and the flushing valve 31, the drain valve 32, the sampling valve 21, and the vacuum inlet valve 51 are closed. At this time, the gas will first enter the sample tank 4, and the sample in the sample tank 4 will flow out from the sample outlet valve 42 under the action of gravity, which is convenient for observing or detecting the fermentation state.

[0032] In a specific implementation manner, refer to Figure 1After sampling, the vacuum pump 5 stops running, the sample outlet valve 42, the flushing valve 31, and the drain valve 32 are opened, and the sampling valve 21 and the vacuum inlet valve 51 are closed. At this time, the central tube 3 and the sample tank 4 are interconnected, and the flushing valve 31 on the central tube 3 can be used to clean the inside.

[0033] In a specific implementation manner, refer to Figure 1 The flushing valve 31 is connected with a pressure device, a low-pressure steam device and a slightly positive-pressure nitrogen device. In the present invention, the flushing valve 31 can be connected with various cleaning devices to clean the pipeline and the sample tank 4.

[0034] First, open the vacuum inlet valve 51, close all sampling valves and the sample outlet valve 42, then start the vacuum pump 5, and evacuate the sample tank 4 and the connecting pipeline to reduce the vacuum degree. After the vacuum degree of the sample tank 4 and the connecting pipeline meets the requirements, close the inlet valve of the vacuum pump 5 and the vacuum pump 5. After opening the corresponding sampling port according to the sampling requirements, the sample is drawn into the sampling tube 2 and enters the sample tank 4. After the sample tank 4 is filled with the sample, close the opened sampling valve and open the sample outlet valve 42 to collect the sample; after sufficient samples are collected, empty the excess samples in the sample tank 4, and then close the sample outlet valve 42. Open the flushing valve 31 and pressurize the sample tank 4, open the drain valve 32 to take out the remaining sample in the sampling tube 2, and then close the drain valve 32, and then fill the sample tank 4 with low-pressure steam through the flushing valve 31 to flush and disinfect the sample tank 4 to prevent the remaining sample from breeding bacteria and affecting the next sampling and the internal environment of the fermentation tank 1, and open the drain valve 32 and the sample outlet valve 42 at the same time; after completing the cleaning of the sample tank 4, fill the sample tank 4 with slightly positive pressure nitrogen to keep the sample tank 4 clean and avoid the breeding of bacteria.

[0035] 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. An anaerobic fermentation tank sampling device, characterized in that: The invention comprises a fermentation tank (1), wherein a plurality of sampling tubes (2) are sequentially connected in layers to the fermentation tank (1), each sampling tube (2) is provided with a sampling valve (21), outlets of the sampling tubes (2) are connected to the same centralizing tube (3), the centralizing tube (3) is connected to a sample tank (4), and the sample tank (4) is connected to a vacuum pump (5).

2. The anaerobic fermentation tank sampling device according to claim 1, characterized in that: A flushing valve (31) is installed at one end of the central pipe (3), and a sewage valve (32) is installed at the other end. The sewage valve (32) is located lower than the flushing valve (31).

3. The anaerobic fermentation tank sampling device according to claim 2, characterized in that: A pressure gauge (41) is installed on the sample tank (4).

4. The anaerobic fermentation tank sampling device according to claim 3, characterized in that: A vacuum inlet valve (51) is installed between the sample tank (4) and the vacuum pump (5).

5. The anaerobic fermentation tank sampling device according to claim 4, characterized in that: A sample outlet valve (42) is provided at the bottom of the sample tank (4).

6. The anaerobic fermentation tank sampling device according to claim 5, characterized in that: Before sampling, the vacuum pump (5) is running, the vacuum inlet valve (51) is opened, and the sample outlet valve (42), flushing valve (31), drain valve (32) and sampling valve (21) are closed.

7. The anaerobic fermentation tank sampling device according to claim 5, characterized in that: During sampling, the vacuum pump (5) stops running, one of the sampling valves (21) is opened, and the vacuum inlet valve (51), the sample outlet valve (42), the flushing valve (31), and the drain valve (32) are closed.

8. The anaerobic fermentation tank sampling device according to claim 5, characterized in that: When the sample tank (4) is full, the sample outlet valve (42) is opened, and the flushing valve (31), the drain valve (32), the sampling valve (21), and the vacuum inlet valve (51) are closed.

9. The anaerobic fermentation tank sampling device according to claim 5, characterized in that: After sampling, the vacuum pump (5) stops running, the sample outlet valve (42), the flushing valve (31), and the drain valve (32) are opened, and the sampling valve (21) and the vacuum inlet valve (51) are closed.

10. The anaerobic fermentation tank sampling device according to claim 2, characterized in that: The flushing valve (31) is connected to a pressure device, a low-pressure steam device and a slightly positive-pressure nitrogen device.

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