Waste heat recovery equipment Products

Heat Pipe Air Preheater

The heat pipe air preheater is used to preheat the combustion-supporting air or other drying purposes of the boiler by utilizing the heat energy carried by the flue gas at the exit of the boiler and efficient heat transfer through the heat pipe. The flue gas temperature of medium and small industrial boilers is generally between 160 and 200 C, and their heat loss is about 10%. Many of them are not well utilized. Common economizers and air preheaters are prone to low temperature corrosion, ash deposition and blockage, which affect the normal operation of the boiler. There are still air leakage problems in tubular air preheaters, resulting in the reduction of combustion-supporting air volume and affecting the output of the boiler. The small temperature difference of low-temperature waste heat requires large heat transfer area of waste heat recovery equipment. It is difficult to recover low-temperature waste heat below 160 C with shell-and-tube air preheater. Some small boilers do not use air preheater in use, which makes the efficiency of boilers lower.
The heat pipe air preheater adopts the vertical placement form, and the reverse horizontal flow of flue gas and air forms gas-gas heat transfer, which maximizes the efficiency of flue gas heat transfer. The heat pipe air preheater is composed of a box, a heat pipe bundle and a middle partition. The box body is divided into two sides: flue gas on one side and air on the other. Heat pipe air preheater makes full use of the characteristics of fast heat transfer speed and high heat transfer efficiency of heat pipe, and effectively overcomes the problem of low heat transfer coefficient in gas-to-gas heat transfer. The heat transfer area of the outer wall at both ends of the heat pipe can be appropriately expanded by using fins. This treatment not only strengthens the heat transfer outside the tube, but also effectively reduces the volume and weight of the heat exchanger, saves metal consumables, and achieves a heat exchanger with high performance-price ratio. At the same time, by adjusting the heat flux density of the heating side and the exothermic side of the heat pipe and changing the heat transfer area of the heating side and the exothermic side, the acid dew point corrosion of the fluid to the heat exchange tube can be effectively avoided and the service life of the equipment can be improved.

Our company aims at the series of heat pipe air preheaters for coal-fired, oil-fired and gas-fired boilers. The preheater uses heat pipe as heat exchange component, which can reduce the exhaust gas temperature of the boiler to about 140 C, and preheat the combustion-supporting air to 80 ~120 C. It can improve the efficiency of the boiler by 6%~10% and save coal by 10%. The equipment is reliable in operation and convenient in operation and maintenance. It is an ideal auxiliary equipment for small and medium-sized coal-fired boilers. It can also be used for energy-saving transformation of old boilers. It is a renewal product of old air preheaters and economizers.

The heat pipe air preheater has the advantages of convenient and reliable installation, small size, less occupation of land, strong functionality, high efficiency, high reliability, corrosion resistance, less ash accumulation, easy cleaning and service life of more than 10 years.

Heat Pipe Water Preheater

Heat pipe water preheater equipment mainly utilizes the high thermal conductivity of heat pipe to recycle waste heat flue gas and heat water at the same time so as to achieve the effect of energy saving and emission reduction. The heated water can be used for production and daily life. It is widely used in chemical, nitrogen fertilizer, glass, building materials and other production enterprises. It is our heat pipe application energy-saving products, and has the value of promotion and application in all parts of the world.

The heat pipe water preheater can reduce the exhaust gas temperature of the boiler to about 140 C, and raise the feed water temperature of the boiler to 70 - 90 C. The coal consumption can be reduced by 5% - 10%. The equipment runs reliably and is easy to use and maintain. It is an ideal auxiliary equipment for small and medium-sized coal-fired boilers. It can also be used for energy-saving retrofit of old boilers and is a renewal product of old economizers.

There are two types of heat pipe water preheater, vertical and horizontal, which are rectangular in shape. It consists of steel heat pipe assembly, flue gas exothermic zone, water tank heat absorbing zone, middle partition board, water inlet and outlet pipe interface, water tank sewage outlet, two sides inspection of ash cleaning door, ash removal door, top exhaust hole, gas inlet and outlet interface and so on. Vertical heat pipe water preheater structure type is flue gas inlet and outlet along the horizontal direction, heat pipe assemblies are upright, general boilers are equipped with this type; horizontal heat pipe water preheater structure type is flue gas inlet and outlet along the vertical direction, heat pipe assemblies approximate horizontal layout, this type is rarely used, generally used in reconstruction projects to meet the needs of specific installation space.

Heat pipe evaporator

The heat pipe evaporator is a waste heat recovery device developed for the current situation of high exhaust gas temperature and high energy loss in the kiln. The steam produced by the waste flue gas of the kiln is used as an atomizing agent for the fuel or used to preheat the heavy oil, so that the system steam can be completely self-sufficient, and can also be used as a vaporizer and a domestic steam for the gas generator.
The heat pipe evaporator is mainly composed of bubbles, heat pipes and smoke boxes. The equipment is mainly installed in the flue after the regenerator. The exhaust gas generated by the kiln passes through the flue box of the equipment. The heat pipe in the flue box absorbs the waste heat from the flue gas and transfers it to the water in the drum. The water is heated and vaporized to produce saturated steam for production and daily use, thus replacing the original steam boiler and achieving the function of energy saving and consumption reduction.

Heat pipe air preheater,heat pipe water preheater,Heat pipe evaporator,in addition to the pre-calculation of the corresponding tonnage of the fixed design of the boiler, will be based on the actual data provided by customers and the desired results, site area, connection mode and other factors to calculate separately. Therefore, customers need to provide the following data:

  1. Flue gas inlet temperature
  2. Flue gas outlet temperature
  3. Flue gas flow rate
  4. Air (water) inlet temperature
  5. Air (water) outlet temperature
  6. Air (water) flow rate

As mentioned above, users need to provide at least four key data:

  • flue gas inlet temperature
  • flue gas flow rate
  • air (water) inlet temperature
  • air (water) flow rate [or air (water) outlet temperature]

Heat Pipe Water (Oil) Cooler

Large-capacity power equipment is generally cooled by a water cooler. The water cooler greatly improves the cooling effect, but it is expensive to manufacture, the water intake is limited, and the water cost is relatively expensive. If circulating water is used, scale is easily generated in the cooler, which affects the cooling effect. More deadly, because the cooling and insulating medium of large-capacity power equipment is generally transformer oil, if the water cooler leaks during operation, the cooling water leaks to the oil side of the power equipment and mixes with the transformer oil, which is easy to cause insulation. Accidents seriously affect the safe operation of electrical equipment.
The heat pipe type cooler is completely different from the traditional heat exchanger. The heat pipe type cooler uses the principle of thermal effect when the cooling medium changes state. That is, the cooling medium needs to absorb heat when it changes from liquid to gas, and it changes from gaseous to gaseous. The heat needs to be released in the liquid state.

A heat pipe cooler replaces a conventional tube-and-tube cooler and has the following advantages:

1) For air-to-air heat transfer:

  1. By utilizing the high heat transfer performance of the heat pipe, the heat exchange in the cold air is converted into the heat exchange outside the pipe, so that the heat exchange area can be easily expanded, thereby reducing the volume and weight of the cooler.
  2. The flow resistance outside the tube is small.

2) For water (oil) - air heat transfer:

  1. Water does not flow in the tube of each tube, but outside the heat tube-end tube, as long as the separator is well sealed, water can be prevented from leaking into the device;
  2. Each heat pipe is an independent heat transfer element. Even if it is damaged by water erosion, water will not leak to the air side, which can ensure the safe operation of the equipment. Moreover, the failure of a few heat pipes will not affect the performance of the whole equipment. Unlike tubular coolers, once they leak, they must be shut down.
  3. It is designed to adjust the surface temperature of the heat pipe to keep it above the dew point temperature of the circulating air, to avoid condensation water droplets appearing in the air, and the insulation requirements.

What is a heat pipe?