High-temperature high-pressure adsorption tester

Abstract

The invention discloses a high-temperature high-pressure adsorption tester, which is used for testing isothermal adsorption quantity and desorption quantity of coal bed gas and shale gas under different pressure conditions. The high-temperature high-pressure adsorption tester comprises a gas supercharging device, an adsorption device, a temperature control device, a lifting device and a data acquisition system. A pneumatic switch valve is connected to a helium tank; the outlet end of the pneumatic switch valve is connected with a safety valve, a shuttle valve and a booster pump; the outlet of the booster pump is connected with 2 to 8 pneumatic switching valves in parallel; each pneumatic switching valve is connected with a reference tank and a sample adsorption tank; and the other ends of the reference tank and the sample adsorption tank are connected with a pressure transmitter respectively. An evaporator of a refrigeration system is fixed at the bottom of a thermostatic oil tank; and a perforated clapboard, an electric heating element and a temperature controller are fixed in the thermostatic oil tank. The invention has the advantages that: the high-temperature high-pressure adsorption tester is rational and compact in structure and convenient to move and use, and is particularly suitable for laboratory experiments of the desorption quantity and the adsorption quantity of the coal bed gas and the shale gas.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure adsorption tester, in particular to an experimental instrument for testing the adsorption and desorption amounts of coal bed gas and shale gas. Background technique [0002] At present, coalbed methane and shale gas are a kind of natural gas in the state of adsorption, free or dissolution in coal seam or shale. In conventional natural gas reservoirs, it is generally free gas and dissolved gas, and there is basically no adsorbed gas, while in unconventional natural gas reservoirs such as coal seams and shale, the content of adsorbed gas is relatively high, and the content of adsorbed gas in coal seams and shales is average. If it is greater than 50%, the amount of adsorbed gas is directly related to the enrichment degree and development technology of natural gas. Especially for unconventional natural gas such as coalbed methane and shale gas, the determination of adsorbed gas amount is the ke...

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Problems solved by technology

[0004] 1. The above-mentioned devices generally use a temperature of less than 60 degrees and a pressure of less than 12 MPa. It is difficult to complete the test task of coal rock and shale gas adsorption capacity in a relatively large temperature and pressure range.

[0005] 2. The above-mentioned devices generally use a small amount of samples and poor representativeness, making it difficult to accurately measure the adsorption capacity of coal rocks and shales

[0006] 3. The above-mentioned experimental devices generally only have the heating device for heating up, and no refrigeration device is used for cooling down. Therefore, after some experiments with slightly higher temperatures are generally done, if you continue to do low-temperature experiments, use natural cooling, the cooling period is long, and the experimental efficiency is low.

[0007] 4. The above-mentioned experimental equipment lacks a sample loading and unloading auxiliary system, and loading and unloading the sample adsorption tank is time-consuming, laborious, and low in work efficiency

Control the adsorption process to be carried out in a sealed pressure vessel, measure the dynamic process of pressure change and temperature distribution, obtain gas-solid adsorption data, and then obtain the thermodynamic and kinetic parameters of the adsorbent, and control the experiment automatically by the control device Repeatedly; the device for implementing the method includes an air charging column, an adsorption column, a constant temperature tank, a vacuum component, a heater, a control valve, a pressure transmitter, a temperature controller, and an automatic control component; the effect is that the introduced random error is small, and the implementation It is easy and convenient, and can obtain many thermodynamic and dynamic parameters of the adsorption process at the same time, and can be implemented in a wide range of temperature and pressure, which is closer to the actual industrial process conditions, and the accuracy of the measured data is better, which can be compared It fully reflects the performance of the adsorbent, but without a refrigeration system, it is impossible to cool down and control the temperature

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