{"id":4418,"date":"2025-05-05T09:31:11","date_gmt":"2025-05-05T01:31:11","guid":{"rendered":"https:\/\/www.26yc.com\/?p=4418"},"modified":"2026-10-01T08:24:49","modified_gmt":"2026-10-01T15:24:49","slug":"mine-exhaust-air-waste-heat-fresh-air-heating","status":"publish","type":"post","link":"https:\/\/www.26yc.com\/es\/mine-exhaust-air-waste-heat-fresh-air-heating\/","title":{"rendered":"Mine Exhaust-Air Waste-Heat Utilization and Fresh-Air Heating Scheme"},"content":{"rendered":"

Overview<\/strong>
\nMine exhaust air refers to the low-temperature hot air discharged from the mine ventilation system. It contains a certain amount of thermal energy and is usually discharged directly, causing energy waste. Exhaust-air waste-heat recovery technology recovers this thermal energy for heating fresh air or other uses, improving energy efficiency while reducing consumption and environmental pollution. This scheme introduces the principle, technical options, and specific application of mine exhaust-air waste-heat recovery for fresh-air heating.
\nPrinciple of Exhaust-Air Waste-Heat Recovery<\/strong>
\nExhaust-air waste-heat recovery is mainly based on heat-pump technology or heat-exchanger systems, extracting low-temperature heat from the exhaust air and converting it into usable high-temperature heat. The working principle:
\nHeat capture: Exhaust air passes through a heat exchanger or heat-pump system, transferring heat to the working medium (water or refrigerant).
\nHeat conversion: The heat pump raises the heat temperature through compression and expansion, making it suitable for heating or other uses.
\nHeat output: The converted high-temperature heat is used to heat fresh air, for space heating, or hot-water supply.
\nExhaust-Air Waste-Heat Recovery Options<\/strong>
\n1. Heat-Pump System
\nEquipment: Air-source or water-source heat pump.
\nWorkflow:
\nExhaust air passes through the evaporator, releasing heat to the refrigerant.
\nThe refrigerant is compressed and heated, then transfers heat to water or air in the condenser.
\nThe heated medium is used for fresh-air preheating or space heating.
\nAdvantages:
\nHigh efficiency and energy saving; COP typically above 3.0.
\nSuitable for low-temperature environments with stable operation.
\nApplication: Cold-region mines in winter for fresh-air heating or building heating.
\n2. Heat-Exchanger System
\nEquipment: Plate or shell-and-tube heat exchanger.
\nWorkflow:
\nExhaust air and fresh air exchange heat in the exchanger; exhaust heat is transferred directly to the fresh air.
\nThe preheated fresh air enters the ventilation system, reducing heating energy use.
\nAdvantages:
\nSimple structure, low maintenance cost.
\nSuitable for scenarios with lower heat demand.
\nApplication: Mild-climate mines or those with smaller fresh-air preheating needs.
\n3. Hybrid System
\nEquipment: Heat pump combined with heat exchanger.
\nWorkflow:
\nThe exchanger initially recovers exhaust heat to preheat fresh air.
\nThe heat pump further raises the heat temperature to meet higher-temperature demand.
\nAdvantages: Combines efficiency and economy, adapts to various conditions.
\nApplication: Deep mines with larger heat demand or integrated energy-utilization projects.
\nFresh-Air Heating Scheme
\nHeating fresh air is an important application of exhaust-air waste-heat recovery, especially in cold regions where fresh air must be heated to a suitable temperature to ensure a safe working environment. The following are specific schemes:
\n1. Fresh-Air Preheating System
\nWorkflow:
\nExhaust air passes through the exchanger, transferring heat to the incoming fresh air.
\nThe preheated fresh air enters a heating device (electric or heat pump) to reach the target temperature.
\nAdvantages: Reduces heating-device energy use and operating costs.
\nCase: A coal mine used a plate heat exchanger, raising fresh-air preheat temperature by 10\u201315\u2103 and saving 30% of heating energy.
\n2. Heat-Pump Direct Fresh-Air Supply
\nWorkflow:
\nExhaust heat is extracted via the heat-pump system to heat circulating water or air.
\nThe heated medium is used directly for fresh-air heating and sent into the mine ventilation system.
\nAdvantages: Efficient and stable, suitable for large-scale fresh-air heating.
\nCase: A mine used an air-source heat pump with 60% exhaust-heat recovery and fresh-air temperature stably above 20\u2103.
\n3. Smart Control System
\nFunctions:
\nMonitor exhaust temperature, flow, and fresh-air demand in real time.
\nAutomatically adjust heat-pump or exchanger operation to optimize efficiency.
\nAdvantages: Improves system efficiency, reduces manual intervention.
\nCase: A mine introduced a PLC control system, raising heat-utilization rate by 15%.
\nAdvantages and Economic Benefits<\/strong>
\nEnergy saving and emission reduction: Recovering exhaust heat reduces traditional coal or electric heating, lowering CO2 emissions.
\nEconomy: Higher upfront investment but low operating cost; payback is generally 3\u20135 years.
\nEnvironmental benefit: Reduces heat discharge and improves the surrounding mining-area environment.
\nCase analysis: A coal-mine exhaust-air project saves about 2,000 tons of standard coal and 5,000 tons of CO2 annually, with economic benefits in the millions of yuan.
\nImplementation Notes<\/strong>
\nExhaust characterization: Measure exhaust temperature, flow, and stability to ensure reasonable design.
\nEquipment selection: Choose suitable heat-pump or exchanger models based on mine scale and climate.
\nMaintenance: Regularly clean exchangers and inspect heat-pump systems to prevent efficiency decline.
\nPolicy support: Use national energy-saving\/emission-reduction subsidies to lower project investment.
\nConclusion<\/strong>
\nMine exhaust-air waste-heat recovery technology provides a sustainable energy solution for green mining. The fresh-air heating scheme effectively recovers exhaust heat via heat-pump or exchanger systems, improving the mine working environment while significantly reducing energy use and emissions. Combined with smart control and policy support, the scheme has broad application prospects and economic value.<\/p>","protected":false},"excerpt":{"rendered":"

Overview Mine exhaust air refers to the low-temperature hot air discharged from the mine ventilation system. It contains a certain amount of thermal energy and is usually discharged directly, causing energy waste. Exhaust-air waste-heat recovery technology recovers this thermal energy for heating fresh air or other uses, improving energy efficiency while reducing consumption and environmental […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[72],"tags":[202],"class_list":["post-4418","post","type-post","status-publish","format-standard","hentry","category-heat-recovery","tag-mine-ventilation"],"_links":{"self":[{"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/posts\/4418","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/comments?post=4418"}],"version-history":[{"count":1,"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/posts\/4418\/revisions"}],"predecessor-version":[{"id":4761,"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/posts\/4418\/revisions\/4761"}],"wp:attachment":[{"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/media?parent=4418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/categories?post=4418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.26yc.com\/es\/wp-json\/wp\/v2\/tags?post=4418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}