CN205981349U - Simple and easy device of marsh gas volume in survey gas collection bag - Google Patents

Abstract

The utility model relates to a simple and easy device of marsh gas volume in survey gas collection bag, the device include the changeable marsh gas container of volume, transparent feed supplement bottle, vacant collecting vat, weighing machine structure, elevating system, valve, air inlet pipeline, drain pipe, and elevating system arranges one side of feed supplement bottle in, and weighing machine sets up in upgrading mechanism, and the collecting vat is arranged in weighing machine constructs, feed supplement bottle content has a pure water, marsh gas storage container pass through the air inlet pipeline with feed supplement bottle intercommunication to the air inlet pipeline is in one end in the feed supplement bottle is located the liquid level of pure water top, valve concatenate in in the air inlet pipeline, it is interior and its tip in the feed supplement bottle is located below the liquid level of pure water that the drain pipe inserts the feed supplement bottle, and the other end of drain pipe is arranged in in the collecting vat. Is glass feed supplement bottle liquid level higher than collecting vat liquid level 5 under the control end -state through the elevating system regulation 10 centimetre, utilize bernoulli equation, can learn that the water that flows to the collecting vat amasss to the marsh gas volume of gas collection bag.

Description

A Simple Device for Measuring Biogas Volume in Gas Collection Bag

technical field

The utility model relates to the technical field of laboratory devices, in particular to a simple device and a measuring method for measuring the volume of biogas in a gas collecting bag.

Background technique

Global climate change and energy security have prompted the rapid development of renewable energy in recent years. Anaerobic digestion (AD) is widely considered as an important way to convert biomass to energy, and it is a promising and developing energy technology. Sources of digested substrates include biological sludge, organic components of domestic waste, livestock and poultry manure, and agricultural waste. It is very important to investigate the biochemical methane potential (BMP) of waste from different sources to select suitable digestion substrates; to evaluate different pretreatment technologies, such as acid treatment, alkali treatment, microbial treatment, ultrasonic treatment, etc. It is of great significance to the biogas production performance of the substrate; by optimizing parameters such as digestion temperature, inoculum ratio, carbon-nitrogen ratio, and solid content, it has guiding significance for actual production. In the above scientific research fields, it is necessary to conduct small-scale experiments on anaerobic digestion, and biogas production is one of the most critical indicators of anaerobic digestion.

Although there are "methane potential test system" and "wet flowmeter" and other instruments that can automatically measure the production and yield of biogas, they are expensive and difficult to be widely used. However, the water drainage gas collection method is used to measure the volume of biogas, and the liquid needs to be replaced continuously, which is obviously not suitable for batch experiments. In the laboratory research of anaerobic digestion, the use of gas bag to collect biogas and further measure the volume of biogas is widely used. Among them, in the laboratory anaerobic digestion research, the volume of the air bag is generally 0.5L-5L. The Chinese patent document "A Measurable Experimental Device for Biogas Production by Anaerobic Fermentation" (publication number CN202830028U, publication date 2013.03.27) proposes a method that can realize online monitoring of anaerobic fermentation, but the biogas produced in the anaerobic digestion process is also passed through Air bag collection.

At present, the usual method for measuring the volume of biogas in the gas collection bag is to draw out the biogas one by one with a syringe (generally 100 milliliters) for measurement. However, this method has large errors, is very cumbersome, time-consuming and labor-intensive (such as 3L biogas volume needs to be extracted 30 times), and the workload for batch experiments is extremely large. Squeezing the biogas in the air-collecting bag into the drainage bottle for volume measurement has the disadvantages that the air-collecting bag is difficult to squeeze clean, it is very laborious, and the accuracy of the data is not good. Therefore, researchers are urgently looking for a new method that can be used to measure the volume of biogas in the air bag.

Contents of the invention

The utility model aims at providing a simple device for measuring the volume of biogas in the gas collection bag aiming at the current state of the art, which can greatly reduce the workload and save labor.

In order to achieve the above purpose, the utility model provides a simple device for measuring the volume of biogas in the gas collection bag, including a biogas container (1) with variable volume, a transparent feeding bottle (2), an empty collection tank (3), Weighing mechanism (4), lifting mechanism (5), valve (6), air intake pipeline, liquid outlet pipe (III9), the lifting mechanism is placed on one side of the feeding bottle, and the weighing mechanism is placed on the on the upgrading mechanism, and the collection tank is placed in the weighing mechanism; the feeding bottle contains pure water, the biogas container is connected with the feeding bottle through an air intake line, and the air intake line is in the One end in the feeding bottle is located above the liquid level of the pure water, and the valve is connected in series with the air inlet line; the liquid outlet pipe is inserted into the feeding bottle and its end in the feeding bottle The distance below the liquid level of the pure water is greater than 2 cm from the bottom of the feeding bottle, and the other end of the outlet pipe is placed in the collection tank.

The simple device for measuring the volume of biogas in the air-collecting bag is further designed in that: the valve is a three-way valve, two ports of the three-way valve are connected in series in the air intake pipeline, and the other port forms a three-way valve. Filling port for biogas container.

The simple device for measuring the volume of biogas in the gas collection bag is further designed in that: the opening of the feeding bottle is provided with an opening cover with two through holes, and the inlet pipe and the liquid outlet pipe pass through the The two through holes are inserted into the feeding bottle, and a sealing gasket is arranged on the inner side of the opening cover.

The simple device for measuring the volume of biogas in the air-collecting bag is further designed in that: the mouth of the feeding bottle is provided with a double-pass with two pipes, and the inlet pipe and the liquid outlet pipe pass through the double-pass. The pass communicates with the inside of the feeding bottle. The double pass (2-ii) is made of stainless steel, and adopts upper and lower double-layer welding, and there is no air leakage at the welding port.

The simple device for measuring the biogas volume in the gas collection bag is further designed in that: the biogas container and the collection tank are respectively provided with liquid level gauges for measuring the internal liquid level height of the two, and the two liquid level gauges are connected to the A controller is connected, and the controller is connected with the control part of the lifting mechanism by a signal, and the controller sends an instruction to drive the lifting mechanism to raise or lower the height of the collection tank, so that the liquid level of the feeding bottle is higher than that of the collection tank The liquid level inside is 5-10 cm.

The simple device for measuring the volume of biogas in the gas collection bag is further designed in that: the liquid level gauge is a drop-in static pressure liquid level gauge; the lifting mechanism is a hydraulic telescopic rod or a pneumatic telescopic rod. The lifting mechanism, with a maximum vertical height of 30 cm, is used to adjust the height of the collection tank so that the liquid level of the glass feeding bottle is 5-10 cm higher than the liquid level of the collection tank in the final state.

The simple device for measuring the volume of biogas in the air-collecting bag is further designed in that: the weighing mechanism is an electronic balance.

The simple device for measuring the volume of biogas in the gas-collecting bag is further designed in that: the biogas container is a gas-collecting bag.

A method for measuring the volume of biogas in an air-collecting bag using the simple device, comprising the steps of: a. measuring the height difference ΔH between the bottom of the feeding bottle and the bottom of the collecting tank, and recording The weight m1 of the collection tank in an empty state; b. Gently suck the ear washing ball and place it on the outlet pipe port of the collection tank, so that the pure water in the feeding bottle slowly flows to the Inside the collection tank; c, monitor the liquid level height h1 in the feed bottle and the liquid level height h2 in the collection tank, adjust the height of the collection tank through the lifting mechanism, so that the liquid level height h1 in the feed bottle is high The height of the liquid level in the collection tank (h2+△H) is 5-10 cm; d. When the biogas container is completely dry and there is no water flowing out of the liquid outlet pipe, record the weight m2 of the collection tank and the liquid in it at this time; calculate m2 The difference between m1 and m1 is the biogas volume; when the measurement unit of △m is g, the unit of biogas volume is ml.

With the above structure, when in use, connect the air collecting bag and the glass feeding bottle to form a connected closed space, and use the pressure difference as the driving force to make the water in the feeding bottle flow to the collecting tank until it stops. Through the adjustment of the lifting mechanism, the liquid level of the feeding bottle is 5-10 cm higher than the liquid level of the collection tank in the final state, and the volume of water flowing out is the biogas volume of the air collection bag.

The utility model provides a simple device for measuring the volume of biogas in the gas collection bag, which has the advantages of simple structure and low price, is driven by the pressure difference of water, is easy to operate, saves labor, and has high accuracy.

Description of drawings

Fig. 1 is a schematic diagram of the initial state of the working principle of the utility model.

Fig. 2 is a schematic diagram of the working principle of the utility model in a completed state.

Fig. 3 is a schematic structural view of the utility model.

Fig. 4 is a result diagram of measuring the volume of the air-collecting bag by using the utility model.

detailed description

Embodiments of the present utility model are described in further detail below.

As shown in Figure 3, the simple device for measuring the volume of biogas in the gas collection bag includes a volume-variable biogas container 1, a transparent feeding bottle 2, an empty collection tank 3, a weighing mechanism 4, a lifting mechanism 5, and a valve 6 , Intake pipeline I7, liquid outlet pipe III9, the lifting mechanism is placed on one side of the feeding bottle, the weighing mechanism is placed on the upgraded mechanism, and the collection tank is placed in the weighing mechanism; The feed bottle contains pure water, the biogas container communicates with the feed bottle through an air intake line, and one end of the intake line in the feed bottle is located above the liquid level of the pure water, and the valve Connected in series in the air inlet pipeline; the liquid outlet pipe is inserted into the feeding bottle and its end in the feeding bottle is located 2 cm below the liquid level of the pure water from the bottom of the feeding bottle. The other end of the liquid pipe is placed in the collection tank. Wherein the biogas container is an air collecting bag. The weighing mechanism is an electronic balance. The lifting mechanism can adopt the simple lifting mechanism shown in the figure.

The valve is a three-way valve, two ports of the three-way valve are connected in series with the air intake pipeline, and the other port forms the gas filling port of the biogas container or the pure water inlet of the feeding bottle.

The opening of the feeding bottle is provided with an opening cover 2-iv with two through holes, the air inlet pipeline and the liquid outlet pipe are inserted into the feeding bottle through the two through holes, and the opening The inner side of the cover is provided with a sealing gasket 2-iii. The bottle body 2-i of the bottle body 2-i of the opening cap 2-iv is rotated and tightened with the feeding bottle.

The mouth of the feed bottle is provided with a double pass 2-ii with two pipes, and the air inlet pipeline and liquid outlet pipe communicate with the inside of the feed bottle through the double pass. The double pass 2-ii is made of stainless steel, and adopts upper and lower double-layer welding, so there is no air leakage at the welding port.

The feed bottle and the collection tank are respectively provided with liquid level gauges for measuring the internal liquid level height of the two, and the two liquid level gauges are connected with a controller, and the controller is connected with the control part signal of the lifting mechanism. connected, the controller sends an instruction to drive the lifting mechanism to raise or lower the height of the collection tank, so that the liquid level of the feeding bottle is 5-10 cm higher than the liquid level in the collection tank.

The liquid level gauge is a drop-in static pressure liquid level gauge; the lifting mechanism is a hydraulic telescopic rod or a pneumatic telescopic rod. The lifting mechanism, with a maximum vertical height of 30 cm, is used to adjust the height of the collection tank so that the liquid level of the glass feeding bottle is 5-10 cm higher than the liquid level of the collection tank in the final state.

As shown in Figure 1 and Figure 2, the principle adopted by this patented technical solution is the Bernoulli equation, specifically as shown in formula (i)

Initial state: the pressure at point A is P _i = 101.325kPa, the biogas volume of the gas collection bag is V, the headspace volume of the feeding bottle is V ₀ , and the total volume is V _i =V ₀ +V;

Completed state: the flow rate at this time is 0, ignoring the head loss (h _w =0), according to the Bernoulli equation, the calculated point A P _f =101.325kPa+ρg(h ₁ -h ₀ ), the air bag is completely dry The volume is 0, the headspace volume of the feeding bottle is V ₀ +V*, the total volume V _f =V ₀ +V*;

According to the ideal gas state equation PV=nRT, get:

The density of water is 1000kg/m ³ , g=9.8m/s ²

It can be seen from the formula (v) that when the liquid level difference Δh is less than 10 cm, the measurement error of the biogas volume of the gas collection bag can generally be controlled within 1%, which meets most scientific research requirements. At the same time, in order to reduce the time of this process, the liquid level gap Δh is controlled at 5-10 cm.

According to the above principles, the corresponding measurement methods are as follows:

Measure the height difference ΔH between the bottom of the feeding bottle and the bottom of the collection tank, and record the weight m1 of the collection tank in an empty state; The liquid outlet pipe port of the collection tank, so that the pure water in the feeding bottle slowly flows to the inside of the collection tank through the liquid outlet pipe; c, monitor the liquid level height h1 in the feeding bottle and the liquid in the collection tank Position height h2, adjust the height of the collection tank through the lifting mechanism, so that the liquid level height h1 of the feeding bottle is 5-10 cm higher than the liquid level height (h2+△H) in the collection tank; d, when the biogas container is in the In a completely dry state and no water flows out of the liquid outlet pipe, record the weight m2 of the collection tank and the liquid in it at this time; calculate the difference between m2 and m1, which is the biogas volume; when the unit of measurement of △m is g, The unit of biogas volume is ml.

Specifically, the water in the glass feeding bottle (2) flows to the collection tank (3) by gently suctioning the outlet tube (III9) port of the collection tank (3) through the ear wash ball. When the air collection bag (1) is in a completely dry state and no water flows out of the liquid outlet pipe (III9), record the mass of the collection tank and water as m ₂ . During the process, the lifting mechanism (5) is used to adjust so that the liquid level of the final feeding bottle (2) is 5-10 cm higher than the liquid level of the collection tank (3). Calculate the difference between m ₂ and m ₁ , which is the gas volume of the air bag.

Utilize the utility model to measure the volume of biogas in the gas collection bag, the result is as shown in Figure 4, the measurement range is 200mL ^- 5000mL, R2 is 0.9998, the result shows that this method has better accuracy, can satisfy the laboratory fully to the gas collection bag Volume measurement requirements.

Claims (8)

1. A simple device for measuring the volume of biogas in a gas collection bag, characterized in that the device includes a biogas container (1) with variable volume, a transparent feeding bottle (2), an empty collection tank (3), a scale Heavy mechanism (4), lifting mechanism (5), valve (6), air intake pipeline, liquid outlet pipe (III9), the lifting mechanism is placed on one side of the feeding bottle, and the weighing mechanism is placed on the lifting mechanism above, and the collection tank is placed in the weighing mechanism; the feeding bottle contains pure water, the biogas container communicates with the feeding bottle through an air inlet line, and the air inlet line is in the feeding bottle One end in the feeding bottle is located above the liquid level of the pure water, and the valve is connected in series with the air inlet line; the liquid outlet pipe is inserted into the feeding bottle and its end in the feeding bottle is located at the Below the liquid level of the pure water, the other end of the outlet pipe is placed in the collection tank. 2. The simple device for measuring the biogas volume in the air-collecting bag according to claim 1, characterized in that: the valve is a three-way valve, and the two ports of the three-way valve are connected in series in the air intake pipeline , the other port forms the gas filling port to the biogas container. 3. The simple device for measuring the volume of biogas in the air collecting bag according to claim 1, characterized in that: the opening of the feeding bottle is provided with an opening cover with two through holes, the air inlet pipeline, The liquid outlet pipe is inserted into the feeding bottle through the two through holes, and a sealing gasket is arranged on the inner side of the opening cover. 4. The simple device for measuring the volume of biogas in the air-collecting bag according to claim 3, characterized in that: the mouth of the feeding bottle is provided with a double pass with two pipelines, and the inlet pipeline, outlet The liquid pipe communicates with the inside of the feeding bottle through the double-way. 5. The simple device for measuring the biogas volume in the gas collecting bag according to claim 1, characterized in that: the biogas container and the collection tank are respectively provided with liquid level gauges for measuring the internal liquid level height of the two, and the two A liquid level gauge is connected with a controller, and the controller is connected with the control part of the lifting mechanism with a signal, and the controller sends an instruction to drive the lifting mechanism to raise or lower the height of the collection tank, so that the filling bottle liquid The surface is 5-10 cm higher than the liquid level in the collection tank. 6. The simple device for measuring the volume of biogas in the gas collection bag according to claim 5, characterized in that: the liquid level gauge is a drop-in static pressure liquid level gauge; the lifting mechanism is a hydraulic telescopic rod or a pneumatic telescopic rod . 7. The simple device for measuring the volume of biogas in the gas-collecting bag according to claim 1, characterized in that: the weighing mechanism is an electronic balance. 8. The simple device for measuring the volume of biogas in the gas-collecting bag according to claim 1, characterized in that: the biogas container is a gas-collecting bag.