CN-121994096-A - Accurate-filling liquid air energy storage rock breaking method

Abstract

The invention discloses an accurate filling liquid air energy storage rock breaking method which comprises the steps of adopting a clamping type ultrasonic flowmeter to monitor liquid air flow and update injection quantity in real time, adopting a pressure sensor, an oxygen concentration sensor and a temperature sensor to monitor liquid air leakage, calculating liquid air volatilization quantity through oxygen concentration change and the sensor, correcting pressure and temperature of the volatilized air volume, calculating volatilization rate, accurately calculating liquid air storage quantity in a blast hole based on the liquid air injection quantity and the volatilization quantity, uniformly collecting and collecting data of all the sensors to a control center, establishing an embedded system to realize real-time storage and processing of data, and warning and automatically closing liquid air transmission when temperature mutation or pressure abnormality is detected. The invention is used for working conditions which need to pay attention to environmental protection, crushing effect and control degree in industries such as water conservancy and hydropower, traffic, mines and the like, so as to improve the efficiency of liquid air energy storage and rock breaking.

Inventors

• TAN PENG
• ZHANG JIANJUN
• DU SHUAIQUN
• WU GANG
• Dou Jinxi
• XIN JUNSHENG
• HU YINGGUO
• DONG YUAN
• HUANG YUEJUN
• LIU MEISHAN
• XU CHENYU
• HUANG XIMING
• Ai chan

Assignees

• 中国雅江集团有限公司
• 长江水利委员会长江科学院
• 中国葛洲坝集团第二工程有限公司

Dates

Publication Date

20260508

Application Date

20251203

Claims (6)

1. 1. The method for breaking rock by accurately filling liquid air energy storage is characterized by comprising the following steps of: s1, monitoring liquid air flow by adopting a clamping ultrasonic flowmeter, and updating injection quantity in real time; s2, monitoring liquid air leakage by adopting a pressure sensor, an oxygen concentration sensor and a temperature sensor, and stopping injection when the pressure of the pipeline, the oxygen concentration in the air and the temperature are abnormal; S3, monitoring the air volume through the oxygen concentration change and the sensor, and calculating the volatilization volume of liquid air, carrying out pressure and temperature correction on the volatilization volume based on an ideal gas law, and calculating the volatilization rate; s4, accurately calculating the liquid air storage amount in the blast hole based on the liquid air injection amount and the volatilization amount; And S5, uniformly collecting and summarizing the data of all the sensors to a control center, establishing an embedded system to realize real-time storage and processing of the data, generating detailed reports of the injection quantity and the volatilization quantity of the liquid air, including the volatilization rate, the total volatilization quantity, the pressure and the temperature change, and warning and automatically closing the transmission of the liquid air when the temperature mutation or the pressure abnormality is monitored.
2. 2. The method for accurately filling liquid air energy storage rock breaking according to claim 1, wherein the specific step of S1 is that a clamp type ultrasonic flowmeter for non-contact measurement is adopted, the clamp is arranged outside a pipeline, and the flow velocity of fluid in the pipeline is measured by using an acoustic wave conduction technology, so that the fluid is prevented from being directly contacted.
3. 3. The method for breaking rock by accurately filling liquid air energy storage according to claim 1, wherein the specific step of S2 is that a pressure sensor is arranged on the inner wall of an injection port and is close to a gun orifice, pressure change in a pipe is monitored when liquid air is injected into a gun hole, and an oxygen concentration sensor and a temperature sensor are arranged on the outer wall of the pipe injection port to ensure that oxygen concentration and temperature in the liquid air injection process are kept in a reasonable range.
4. 4. The method for accurately filling the liquid air to store energy and break rock according to claim 1, wherein the specific step of S3 is that an electrochemical sensor suitable for low temperature is selected as an oxygen concentration sensor, and the electrochemical sensor is arranged near a blast hole and used for detecting the concentration of volatilized oxygen, and the volatilized amount is accurately calculated by combining the gas volume, the temperature and the pressure.
5. 5. The method for breaking rock by accurately filling liquid air energy storage according to claim 4, wherein the calculation method of the volatilization amount is as follows: Assuming that the volatilized liquid air is an ideal gas, the calculation of the volatilized amount comprises ① measuring the volume and concentration of the gas, ② volatilizing amount of the gas, ③ pressure and temperature correction and ④ volatilizing rate; ① Measuring the volume and concentration of liquid air: Oxygen volume, namely monitoring the volume of oxygen after gas volatilization by using a gas sensor, and analyzing the gas state change in the environment where the sensor is positioned according to an ideal gas law. The volume of the gas is calculated by an ideal gas state equation, see formula (1): (1) Wherein P is the gas pressure Pa, V is the gas volume m 3 , n is the gas mole number mol, R is the ideal gas constant, and 8.314 J.mol -1 ·k -1 is taken; The gas concentration is that the gas sensor gives out an oxygen concentration value, and the volume V of the volatile gas is calculated through the concentration C and the monitored air volume V monitor ; ② And (3) calculating the volatilization amount: the volatile gas volume can be calculated by formula (2): (2) Wherein, C is oxygen concentration, and V monitor is the monitorable volume of the sensor; the gas volume and the liquid volume are converted, the liquid-to-gas volume ratio of the liquid oxygen is about 1:861, namely 1L of liquid oxygen can volatilize to 861L of gaseous oxygen, and the specific conversion is shown in the formula (3): (3) ③ Pressure and temperature correction: based on the ideal gas law, the actual gas volume V r can be corrected by equation (4): (4) Wherein P std is standard atmospheric pressure, 101325Pa, T std is standard temperature 25 ℃, thermodynamic temperature conversion is carried out at the standard atmospheric pressure, 25+273.15=298.15K, P real is actual liquid air pressure, pa, T real is actual air temperature, K; ④ And (3) calculating the volatilization rate: By continuously monitoring the volume change data of the gas, the volatilization rate in unit time can be calculated, as shown in formula (5): (5) wherein R LOX is the liquid air volatilization rate, deltaV LOX is the liquid oxygen volatilization amount in a period of time, and Deltat is the time interval; Based on this, the total amount of volatilization V A for a certain period of time, i.e., the period of time t 1 to t 2 , can be calculated, see formula (6): (6)。
6. 6. the method for precisely filling liquid air energy storage rock breaking according to claim 1, wherein the calculating method of the liquid air storage amount in the blast hole in S4 is as follows: The liquid air injection amount obtained by the flowmeter can accurately calculate the liquid air energy storage amount in the blast hole based on the volatilization amount obtained in the step S3, and the formula (7) is shown (7) Wherein V S is the storage amount of liquid air in the blast hole, V inlet is the input amount of liquid air in the pipeline, and V LOX is the volatilization amount of liquid air.

Description

Accurate-filling liquid air energy storage rock breaking method Technical Field The invention relates to the technical field of blasting of water conservancy and civil engineering, in particular to a method for breaking rock by accurately filling liquid air energy storage. Background As a new blasting technique, liquid air-induced cracking rock mass has remarkable advantages in environmental protection, crushing effect and control degree compared with the conventional blasting, but the characteristic that liquid air is volatile at normal temperature and normal pressure causes gasification loss after being actually injected into blast holes, the content of liquid air injected into the blast holes is continuously reduced and is difficult to measure, if the injection amount and the volatilization amount of liquid air are not accurately estimated to change, and the blasting effect of the rock mass is difficult to be ensured due to insufficient release of blasting energy. To fundamentally solve the problem of liquid air rock breaking, the volatilization amount and storage amount of the liquid air in the blast hole must be accurately calculated from the energy storage angle, so that the control of the rock blasting effect can be more closely guided. Therefore, a new method for breaking rock by accurately charging liquid air energy storage is needed to solve the above problems. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides an optimal design method for liquid air energy storage rock breaking, which can be used for accurately filling, is simple to operate, and is time-saving and labor-saving, aiming at the engineering technical situation that the influences of rock mass cracks, gasification loss and the like on the gun hole reserves are not fully considered in the existing liquid air rock breaking technology. The accurate-filling liquid air energy storage rock breaking method comprises the following steps: s1, monitoring liquid air flow by adopting a clamping ultrasonic flowmeter, and updating injection quantity in real time; s2, monitoring liquid air leakage by adopting a pressure sensor, an oxygen concentration sensor and a temperature sensor, and stopping injection when the pressure of the pipeline, the oxygen concentration in the air and the temperature are abnormal; S3, monitoring the air volume through the oxygen concentration change and the sensor, and calculating the volatilization volume of liquid air, carrying out pressure and temperature correction on the volatilization volume based on an ideal gas law, and calculating the volatilization rate; s4, accurately calculating the liquid air storage amount in the blast hole based on the liquid air injection amount and the volatilization amount; And S5, uniformly collecting and summarizing the data of all the sensors to a control center, establishing an embedded system to realize real-time storage and processing of the data, generating detailed reports of the injection quantity and the volatilization quantity of the liquid air, including the volatilization rate, the total volatilization quantity, the pressure and the temperature change, and warning and automatically closing the transmission of the liquid air when the temperature mutation or the pressure abnormality is monitored. In a preferred embodiment of the scheme, the specific step of S1 is to adopt a clamp type ultrasonic flowmeter for non-contact measurement, place the clamp outside a pipeline, and use an acoustic wave conduction technology to measure the flow velocity of fluid in the pipeline so as to avoid direct contact with the fluid. In a preferred embodiment of the scheme, the specific step of S2 is that a pressure sensor is arranged on the inner wall of the injection port and is close to the gun hole, pressure change in the pipe when liquid air is injected into the gun hole is monitored, and an oxygen concentration sensor and a temperature sensor are arranged on the outer wall of the pipe injection port, so that the oxygen concentration and the temperature in the liquid air injection process are kept in a reasonable range. In a preferred embodiment of the scheme, the specific step of S3 is to select an electrochemical sensor suitable for low temperature as an oxygen concentration sensor, and arrange the electrochemical sensor near a blast hole mouth for detecting the volatilized oxygen concentration, and accurately calculate the volatilized amount by combining the gas volume, the temperature and the pressure. Further, the calculation method of the volatilization amount comprises the following steps: Assuming that the volatilized liquid air is an ideal gas, the calculation of the volatilized amount comprises ① measuring the volume and concentration of the gas, ② volatilizing amount of the gas, ③ pressure and temperature correction and ④ volatilizing rate; ① Measuring the volume and concentration of liquid air: Oxygen volume, namely monitoring the vo