CN-122017155-A - Test device and method for simulating mineralization and sequestration of deep solid waste carbon dioxide

CN122017155ACN 122017155 ACN122017155 ACN 122017155ACN-122017155-A

Abstract

The invention discloses a test device and a method for simulating mineralization and sealing of deep solid waste carbon dioxide, which belong to the technical fields of mine safety, solid waste recycling and carbon dioxide sealing, and comprise a gas reaction cavity, a middle partition plate, a high-pressure gas automatic reaction kettle and a bottom control mechanism, carbon dioxide is introduced into the reaction cavity through a gas channel pipe, the rapid hydraulic response mechanism continuously monitors the pressure of gas, the upper pressing plate and the pointed cone are driven to move downwards after the pressure reaches a critical value, the pointed cone punctures the ceramic sheet to enable the gas to rapidly fill the reaction kettle, the gangue is crushed, the gangue and carbon dioxide are filled in the reaction kettle, carbonate minerals are generated through the reaction of alkaline industrial solid waste and injected carbon dioxide, and carbon sequestration is realized. The temperature control component and the gas pressure detection component are used for monitoring the temperature and the gas pressure in the reaction kettle in real time. The invention can be applied to the process of mineralizing and sealing carbon dioxide in the underground high-pressure environment, and has the effects of crushing gangue and stabilizing gas pressure.

Inventors

FENG ZICHANG
HU CHAOHAN
JU MINGHE
WEI LIYUAN
LI JIANCHUN
LI XING
ZHENG YANLONG
LI BAIYI

Assignees

中国矿业大学

Dates

Publication Date: 20260512
Application Date: 20260401

Claims (10)

1. A test device for simulating mineralization and sealing of deep solid waste carbon dioxide is characterized by comprising a gas reaction cavity, an intermediate baffle plate, a high-pressure gas automatic reaction kettle and a bottom control mechanism, wherein the intermediate baffle plate is respectively connected with the gas reaction cavity and the high-pressure gas automatic reaction kettle through connecting threads, the gas reaction cavity is positioned above the high-pressure gas automatic reaction kettle, and the bottom of the high-pressure gas automatic reaction kettle is connected with the bottom control mechanism through a spring assembly.
2. The test device for simulating mineralization and sealing of deep solid waste carbon dioxide according to claim 1, wherein the upper end face of the high-pressure gas automatic reaction kettle is tightly contacted with the lower surface of the middle partition plate, and the lower end face of the high-pressure gas automatic reaction kettle is attached to the lower pressing plate; the spring assembly comprises a plurality of springs, and the springs are connected between the lower pressing plate and a base in the bottom control mechanism.
3. The test device for simulating mineralization and sealing of deep solid waste carbon dioxide according to claim 2, wherein the bottom control mechanism further comprises a gas pressure detection component and a temperature control component, the temperature control component adopts a heating jacket and a cooling loop which encircle the high-pressure gas automatic reaction kettle to accurately regulate and maintain the temperature in the high-pressure gas automatic reaction kettle at a target value so as to simulate the specific formation temperature, the gas pressure detection component adopts a high-precision pressure sensor, and a probe is communicated with the inside of the high-pressure gas automatic reaction kettle to start continuous and real-time acquisition of pressure data and transmission to an external recorder.
4. The test device for simulating mineralization and sealing of deep solid waste carbon dioxide according to claim 3, wherein the gas reaction cavity is communicated with a gas channel pipe, an upper pressing plate is further arranged in the gas reaction cavity, a rapid hydraulic response mechanism is arranged in the gas reaction cavity and controlled by an operation table, a pointed cone is arranged at the bottom of the upper pressing plate, the upper pressing plate is matched with the size of the gas reaction cavity, and the rapid hydraulic response mechanism controls the upper pressing plate and the pointed cone to move downwards.
5. The test device for simulating mineralization and sealing of deep solid waste carbon dioxide according to claim 4, wherein the middle partition plate is provided with a through hole, a ceramic sheet is fixed on the through hole through a ceramic sheet buckle, and the ceramic sheet is arranged up and down correspondingly to the position of the pointed cone.
6. The test device for simulating mineralization and sealing of deep solid waste carbon dioxide according to claim 5, wherein a nozzle is further arranged at the bottom of the middle partition plate, an outlet of the nozzle faces the high-pressure gas automatic reaction kettle, and the nozzle corresponds to the ceramic sheet and the pointed cone in an up-down mode.
7. The test device for simulating mineralization and sequestration of deep solid waste carbon dioxide according to claim 6, wherein the high-pressure gas automatic reaction kettle is filled with solid waste samples, and the high-pressure resistant cylinder wall is arranged outside the high-pressure gas automatic reaction kettle.
8. The test device for simulating mineralization and sealing of deep solid waste carbon dioxide according to claim 7, wherein the gas channel pipe penetrates through the upper pressing plate, and a rubber sleeve for guaranteeing airtight sealing is arranged at the joint of the gas channel pipe and the upper pressing plate.
9. The test device for simulating mineralization and sequestration of deep solid waste carbon dioxide according to claim 8, wherein the gas introduced into the gas channel tube is carbon dioxide.
10. The method for using the test device for simulating mineralization and sequestration of deep solid waste carbon dioxide according to any one of claims 1 to 9, which is characterized by comprising the following steps: step one, assembling the whole device, filling solid waste samples into a high-pressure gas automatic reaction kettle, tightly connecting a gas reaction cavity with a high-pressure gas automatic reaction kettle through connecting threads and a middle partition plate to form two mutually independent and communicated chambers, arranging a lower pressing plate at the bottom of the high-pressure gas automatic reaction kettle, flexibly connecting the lower pressing plate with a bottom control mechanism through a plurality of springs, and integrating a temperature control assembly and a gas pressure detection assembly inside the bottom control mechanism; Introducing carbon dioxide into the gas reaction cavity through the gas channel pipe, and when the pressure in the cavity of the gas reaction cavity reaches a preset simulated stratum fracture critical value, automatically triggering a quick hydraulic response mechanism to drive an upper pressing plate and a pointed cone to move downwards at a high speed so as to finish quick conversion from pressure monitoring to mechanical action; step three, when the pointed cone is driven to strike down, a ceramic sheet can be accurately and forcefully pierced, a controllable and instant release channel is opened for accumulated high-pressure carbon dioxide, the process of breaking geological weak zones by gas is simulated, and carbon dioxide enters a high-pressure gas automatic reaction kettle to rapidly punch and crush solid waste samples; And if the pressure in the high-pressure gas automatic reaction kettle is abnormally increased, the lower pressure plate compresses the spring to descend, and the volume is increased to buffer the pressure, so that the elastic bearing effect of the underground stratum is dynamically simulated, the pressure of the reaction environment is kept stable, and the temperature control component and the gas pressure detection component monitor and regulate the temperature and the pressure in the high-pressure gas automatic reaction kettle.

Description

Test device and method for simulating mineralization and sequestration of deep solid waste carbon dioxide Technical Field The invention relates to the fields of mine safety, solid waste recycling and carbon dioxide sealing and storing, in particular to a test device and a test method for simulating mineralization and sealing and storing of deep solid waste carbon dioxide. Background Carbon dioxide is injected into the ground and mineralizes with alkaline minerals to generate stable carbonate, which is an important way for realizing long-term and safe carbon sequestration. However, the real geological storage environment has the characteristics of high pressure, complex stress, heterogeneous reaction medium and the like. At present, a static reaction kettle is mostly adopted in a laboratory simulation method, and carbon dioxide gas is simply introduced into solid particles of a fixed bed layer. The method has obvious limitations that firstly, the underground stress change and the crushing action of gas pulse migration on the solid waste framework cannot be simulated, a new reaction interface generated by crushing is important for improving the sealing rate and the total amount, and secondly, the stability of the system pressure is difficult to maintain when the reaction gas is consumed or the temperature fluctuates, and a constant pressure environment is an important condition for researching the reaction dynamics. Therefore, an experimental device capable of simulating the series of underground real physical and chemical processes of high-pressure gas pulse injection, solid waste in-situ impact crushing and reaction system pressure self-balancing is needed to more accurately evaluate mineralization sequestration potential and optimize engineering parameters. Disclosure of Invention The invention aims to provide a test device and a test method for simulating mineralization and sealing of deep solid waste carbon dioxide, which realize integrated simulation of high-pressure gas pulse injection, solid waste in-situ impact crushing and reaction system pressure self-balancing, and solve the problems that the existing laboratory simulation of underground mineralization and sealing of carbon dioxide is mostly dependent on static and low-pressure reaction environments, and the dynamic process of breaking rock strata and crushed minerals through high-pressure gas in deep strata and maintaining pressure balance under the action of stratum elasticity cannot be truly reduced. The invention provides a test device for simulating mineralization and sealing of deep solid waste carbon dioxide, which comprises a gas reaction cavity, an intermediate baffle plate, a high-pressure gas automatic reaction kettle and a bottom control mechanism, wherein the intermediate baffle plate is respectively connected with the gas reaction cavity and the high-pressure gas automatic reaction kettle through connecting threads, the gas reaction cavity is positioned above the high-pressure gas automatic reaction kettle, and the bottom of the high-pressure gas automatic reaction kettle is connected with the bottom control mechanism through a spring assembly. Preferably, the upper end face of the high-pressure gas automatic reaction kettle is tightly contacted with the lower surface of the middle partition plate, and the lower end face of the high-pressure gas automatic reaction kettle is attached to the lower pressing plate; the spring assembly comprises a plurality of springs, and the springs are connected between the lower pressing plate and a base in the bottom control mechanism. Preferably, the bottom control mechanism further comprises a gas pressure detection assembly and a temperature control assembly, wherein the temperature control assembly adopts a heating sleeve and a cooling loop which encircle the high-pressure gas automatic reaction kettle to accurately regulate and maintain the temperature in the high-pressure gas automatic reaction kettle at a target value so as to simulate the specific stratum temperature, the gas pressure detection assembly adopts a high-precision pressure sensor, and a probe is communicated with the inside of the high-pressure gas automatic reaction kettle to start to continuously collect pressure data in real time and transmit the pressure data to an external recorder. Preferably, the gas reaction cavity is communicated with a gas channel pipe, an upper pressing plate is further arranged in the gas reaction cavity, a rapid hydraulic response mechanism is arranged in the gas reaction cavity and controlled by an operation table, a pointed cone is arranged at the bottom of the upper pressing plate, the upper pressing plate is matched with the size of the gas reaction cavity, and the rapid hydraulic response mechanism controls the upper pressing plate and the pointed cone to move downwards. Preferably, the middle partition plate is provided with a through hole, a ceramic sheet is fixed on the through hole through a