7 results about "Thermal impact" patented technology

The invention discloses a system and method for cracking a coal rock stratum through liquid nitrogen and water jet circulation impact. The system comprises a water jet impact system, a liquid nitrogen impact system and a pressure detection system, the main acting object of the system is coal rock stratum drilling, and coal rock is destroyed through low-temperature liquid nitrogen fracturing and water jet strong erosion. In the water jet impact drilling process, residues in a drilled hole can be brought out, a coal body is eroded, a crushing pit is formed, cross cracks are formed around the crushing pit, and a gas migration channel is reconstructed. The cold impact and thermal impact of the low-temperature liquid nitrogen can effectively improve the pore and fracture structure of the coal body, promote the development of cracks formed by water jet impact, and influence the permeability of the coal rock layer. And the water and the ice cyclically impact and supplement each other, so that water in pores is subjected to'water-ice 'two-phase transformation, the damage condition of the coal seam is further enhanced, the pores and cracks in the coal seam are extended, and the situation that' 1 + 1 > 2 'occurs.

The present invention relates to the field of warm wastewater discharge from power plants, and in particular to a device and method for discharging warm wastewater from power plants, the device comprising a drain pipe and a top pipe, the drain pipe being arranged horizontally, the top pipe being arranged at the upper end of the drain pipe, the top pipe being connected to the ocean, and the warm wastewater flowing into the ocean through the drain pipe and the top pipe; the top pipe being a double-layer cylindrical structure, a plurality of blades being arranged between the inner wall of the top pipe and the outer wall of the top pipe, corresponding guide holes being arranged on the inner wall of the top pipe and the top pipe between the two blades, respectively, and the warm wastewater entering the ocean through the guide holes. The present invention enhances the heat dissipation capacity of the warm wastewater by arranging arc-shaped blades and baffles, thereby achieving control over the influence range of the warm wastewater. Compared with the prior art, the drainage system of the present invention can effectively reduce the heat-affected area of ​​the marine environment around the power plant and protect the health of the marine ecosystem.

The application provides a method for determining the collapse pressure of a geothermal well, and belongs to the technical field of drilling. The method comprises the following steps: collecting basic parameters of a target formation; determining a tensile strength reduction parameter of the rock of the target formation through a thermal cracking experiment, the tensile strength reduction parameter being used to represent the reduction degree of the tensile strength of the rock affected by thermal impact; and substituting the basic parameters into a collapse pressure prediction model to obtain the collapse pressure of the target formation, the expression of the collapse pressure prediction model being fused with the tensile strength reduction parameter. The reduction effect of high-temperature thermal impact on the strength of the rock is considered when the collapse pressure is calculated, so that the prediction result of the collapse pressure of the formation is more reasonable, the safe bearing upper limit can be obtained in combination with the engineering safety coefficient, and a scientific basis is provided for construction arrangement.

The present invention belongs to the field of foundation protection technology, specifically to a method for calculating the thermal conductivity of a rubble foundation that takes into account the effects of thermal radiation. The method comprises: collecting air, ground temperature, and wind speed data in the project area; determining the physical parameters of the foundation soil and fill; measuring foundation cross-sectional parameters and the physical parameters of the rubble; calculating the structural parameters and thermal conductivity of the rubble layer; calculating the thermal radiation thermal conductivity and effective thermal conductivity of the rubble layer; establishing a rubble layer model, calculating the impact of the rubble layer on the permafrost of the foundation, taking into account the effects of thermal radiation, and monitoring the relevant calculation results. The present invention provides a theoretical basis for the design and calculation of rubble foundations, solving the problem of not considering the effects of thermal radiation heat transfer during the heat transfer process of the rubble layer. It can more accurately analyze the impact of the cooling characteristics of the rubble layer on the thermal state of the permafrost in the foundation, providing theoretical support and scientific basis for engineering construction in cold regions.

The present application relates to geotechnical engineering, tunnel construction and underground engineering monitoring technical field, disclose a kind of based on shield docking curtain grouting-freezing stratum temperature dissipation prediction method, comprising: calculating maximum temperature rise and thermal influence radius determine temperature sensor layout position, and utilize temperature sensor to collect stratum temperature and draw monitoring temperature time curve, and divide stratum temperature change stage after grouting, determine stage conversion point time and grouting end time, and construct segmented temperature dissipation prediction equation;According to the error between maximum temperature rise and measured temperature rise, correct maximum temperature rise as temperature threshold value to determine target temperature, and match segmented temperature dissipation prediction equation to output stratum temperature dissipation time after grouting;Stratum temperature dissipation time after grouting is used to determine freezing start plan;According to the geological condition parameters of grouting area, output cross-project data migration library.The present application can realize the quantitative prediction of stratum temperature at any time in the future and the time required to reduce to target temperature.

The present application relates to a kind of energy wall thermal influence prediction methods based on thermal bridge intensity gradient under heat and humidity coupling, constructs energy wall geometric model, adds multi-physics field module, and is coupled by heat and humidity multi-physics field module, obtains heat and humidity coupling transient numerical model;After initialization, mesh is divided, the temperature, humidity of grid node is obtained, energy wall outlet temperature is predicted, heat exchange capacity is calculated, indoor side wall surface temperature, relative humidity, heat flow density, wet flow density, thermal bridge effect intensity are predicted;Data monitoring line is added in the central axis of indoor side wall surface, thermal bridge intensity gradient is predicted, and then the maximum influence length area of thermal bridge effect is predicted.The present application is based on heat and humidity coupling transmission principle, can accurately predict the heat exchange capacity of energy wall, improve the accuracy of energy wall heat exchange capacity evaluation result in water-containing humid stratum;At the same time, clear quantitative index is proposed for the degree of influence of indoor side, provides reliable support for engineering design, optimization and risk assessment.

The invention provides a multi-stage pressure-relief permeability-increasing gas extraction promoting method for a low-permeability coal seam, and relates to the technical field of coal mine gas extraction. According to the multi-stage pressure relief and permeability increasing gas extraction promoting method for the low-permeability coal seam, a single permeability increasing means is abandoned, and multi-scale systematic transformation of the low-permeability coal body is achieved through the synergistic effect of four-stage physical fields including macroscopic cavity pressure relief, frost heaving damage, liquid nitrogen gasification explosion impact fracturing and thermal impact damage. The serialization and synergism of multiple physical fields (mechanics, low temperature, explosive shock waves and heating power) realize step-by-step pressure relief and damage superposition from macroscopic to microscopic, and obviously and enduringly improve the overall permeability of the coal seam. Compared with traditional anti-reflection technologies such as explosive blasting, the safety is remarkably improved. The phase change explosion energy caused by the liquid nitrogen and the high-temperature steam is controllable, the action range is mainly concentrated in a preformed cavity and a freezing ring, severe disturbance to surrounding rock, a top plate and a bottom plate is small, and the risk of inducing a top plate accident or coal and gas outburst is reduced.