Exhaust air heat recovery systems for mine

1.Automatic fin cleaning, longer service life of the unit

There is a large amount of high humidity dust in the mine exhaust, which is easily attached to the fins of the unit, affecting the heat exchange efficiency and service life of the unit. The fin automatic cleaning function of the exhaust air heat pump specially developed by Kcalin for this purpose enables the unit to avoid dust intrusion. The cleaning area and drainage pipeline are both set in the high temperature exhaust area, so there is no antifreeze problem.

2.Integral structure, multi-stage heat exchange

The Kcalin mine exhaust air heat pump module unit is designed as a whole. The exhaust air is directly transferred through the fins of the unit. The heat exchange circuit is short, avoiding secondary heat exchange, and the heat efficiency is higher. The unit can realize step heat extraction with large enthalpy difference. The exhaust temperature can be taken below - 10 ℃ to recover more heat.

3.Low evaporation temperature

Kcalin exhaust air heat pump unit can realize high efficiency heating at low ambient temperature by using low-temperature jet enthalpy increasing technology and direct refrigerant evaporation technology. The evaporation temperature of the unit refrigerant is about - 35 ℃. The greater the temperature difference between the evaporation temperature and the exhaust temperature, the higher the heat exchange efficiency and the better the heat exchange effect.

4.Green and environmental protection

Kcalin exhaust air heat pump uses environment-friendly refrigerant R410a, with a destruction coefficient of 0 to the atmospheric ozone layer. It is green, with high heat transfer coefficient, low pressure loss and improved system energy efficiency. R410a refrigerant has more heat per unit volume, less refrigerant can be used for the same heat exchange, reducing the global greenhouse effect, saving energy and reducing emissions, which is in line with the sustainable development strategy.

1.Explosion proof certification has been passed and safe operation is guaranteed

Kcalin mine exhaust air heat pump module unit is designed and manufactured in strict accordance with Explosive Atmospheres Part 1: General Requirements for Equipment (GB3836.1-2010), Explosive Atmospheres Part 2: Equipment Protected by Flameproof Enclosures "d" (GB3836.2-2010), Explosive Atmospheres Part 4: Equipment Protected by Intrinsic Safety "i" (GB 3836.3-2010), and Explosive Environments Part 9: Encapsulated "m" (GB 3836.9-2010), It was inspected by the national quality supervision and inspection department and obtained the "explosion-proof certificate".

This product is applicable to flammable and explosive environment, used for heat recovery of exhausted air and providing hot water to users.

2.Remote Internet of Things intelligent monitoring operation and maintenance platform

The remote Internet of Things intelligent monitoring operation and maintenance platform independently developed by Kcalin, with the Internet and artificial intelligence as the core technology, realizes the intelligent management of the exhaust air heat recovery unit. The administrator can use different terminals to log in to the platform through the browser to remotely control the switch, temperature, control parameters, etc. of different units. The specific functions are as follows:

Remote monitoring and control: parameter setting, operation status display, automatic fault detection and alarm

Automatic compensation function of ambient temperature: automatically adjust the supply and return water temperature according to the change of outdoor ambient temperature

Big data function: data collection, energy consumption analysis, expert diagnosis

Real time collection of heat and electricity

Intelligent management and control, saving manpower and material resources This function is customized

3.Adaptive air volume change

In order to meet the heat recovery needs of some deep mines with variable air volume, Kcalin has specially set an electric heat preservation closed regulating valve for each exhaust air heat recovery unit. When the air volume of the return air shaft changes, part of the exhaust air heat pump module units can be automatically closed to achieve the designed heat supply.

4.Power down memory function

When the exhaust air heat pump suddenly encounters power failure, the unit will automatically return to the operation mode before power failure after power on, and will automatically operate according to the parameters before power failure. If the unit was shut down before the power failure, it will still be shut down after the power is on.(This function is customized)

1.Modular construction

The modular design is adopted for the exhaust air heat pump module unit of Kcalin Mine, which can calmly cope with mines with different air volume and heat demand. The units can be installed in batches according to the progress of the project, which has strong scalability and reduces the initial investment of the project.

2.Desalinate the main sub module design

In a modular control system composed of Kcalin waste air and waste heat recovery unit, each unit can be used as the main module to communicate with other units and coordinate the work of the whole system as required. When the product can only be designed with the fixed unit as the main module, if the main module is damaged, the whole system cannot work normally, and debugging and maintenance are inconvenient.

The exhaust air of the mine is affected by the geothermal energy and contains a large amount of low-grade heat energy. The Kcalin mine heat pump module unit works according to the principle of "reverse Carnot", and uses the refrigerant as the carrier to carry the heat in the exhaust air to the heat side continuously, so as to meet the needs of users in terms of domestic heating.

The working principle of using the exhaust air heat recovery unit for heat supply is simply that the compressor is driven by consuming 1 share of electric energy, and the refrigerant absorbs 4 shares of air energy from the exhaust air. Compared with using electricity to make heat directly, 3 more shares of heat energy are obtained. The mine exhaust air heat pump unit does not directly use electricity for heating, but uses the low-grade heat energy in the exhaust air to increase the temperature by using the gas-liquid change of the refrigerant and then moves it indoors, thus effectively reducing the operating cost of heating in winter for users.

The exploration and practice of coal mine waste heat resource utilization in China started in the mid-1990s and rose at the beginning of this century. After nearly 20 years of development, various coal mine waste heat utilization technologies have emerged one after another. The survival of the fittest through market practice. The waves have washed away the sand. The Kcalin heat pump technical expert team has put forward a complete set of "comprehensive solutions for green cooling and heating systems in coal mines" process package, and has also experienced more than 20 years of green cooling and heating projects in coal mines, Among them, the recovery and utilization technology of exhausted air in coal mine has experienced four generations of replacement. At present, the process package has been proven to be mature and reliable in performance, energy conservation and environmental protection, and has a wide range of applications. It is an ideal choice to realize the national "dual carbon" strategy and the "coal to electricity" policy.

1、KLMK-FF/S-M260/68Ⅰ

2、KLMK-FF/S-M260/68Ⅱ

Note:

1. Executive standard of Kcalin exhaust air heat pump: GB/T25127.1-2020

2. Design working condition: hot water inlet/outlet temperature 45 ℃/55 ℃: air inlet dry bulb/wet bulb temperature 12 ℃/10 ℃

3. See the unit nameplate for the performance parameters of the unit. If there is any change in the specification parameters, please refer to the product nameplate parameters;

4. The appearance, nozzle size and performance parameters of the unit shall be subject to the actual arrival.