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INVENTION
Russian Federation Patent RU2248509
METHOD FOR PRODUCING HOT AIR
Name of the inventor: Pearlstein BH (RU)
The name of the patentee: Kazan State Technical University. AN Tupolev (RU); Pearlstein Boris Haimovich (RU)
Address for correspondence: 420111, Kazan, st. Karl Marx, 10, Tupolev Kazan State Technical University, the patent department
Starting date of the patent: 2002.04.18
The invention relates to the field of gas turbine and can be used to construct industrial installations to produce hot air for use in heating process, the heating of chemical products, steam. The method for producing hot air includes an air expansion turbine to overexpansion to low temperatures, its heat in the first heat-recovery heat exchanger, to the initial compression pressure in booster compressor, second heat removal heat exchanger and the nutrient supply of compressed dry air to the receiver. The air receiver is heated. Use of the invention provide a more efficient method for producing hot air.
DESCRIPTION OF THE INVENTION
The invention relates to the field of gas turbine and can be used to generate the heating source temperature, in particular plus 100 ° C-150 ° C utilizing the energy of flow when a temperature of 20 ° C - + 60 ° C.
Methods are known for obtaining hot air heat pumps based on the inverse Brayton cycle (Lorentz cycle), including a compression process, the heat dissipation extension, the heat input from an external source.
The main drawback of the simple inverse Brayton cycle (Lorentz cycle) is that when the temperature is below zero after the turbine and entering the heat exchanger icing occurs from both the refrigerant (air), and from the flow disposition. To prevent temperature drop below zero is necessary to limit the degree of compression in the compressor, and (or) number of nutritionally removes heat exchanger. Reducing the pressure ratio in the main heat exchanger will reduce the temperature of a heating (Bulgarian AV Muhachev GA, Shchukin VK Thermodynamics and Heat Transfer. M., "High School", 1973. Engineering Technology 2002, number 3 ( 37) P.A.Shelest. The doctrine of the heat and heat pumps. engineering Technology, 2002, № 3 (37), pp. 122-132).
Discloses a method and an apparatus implementing the Lorentz cycle and described in the RF Patent № 2136929, F 24 F 3/14, F 02 C 6/00, 1999. The device is implemented in the method: the air expanded in the turbine to a temperature of 0 ° C, and heat exchange is performed is compressed in the compressor is fed with a temperature of about 45 ° C to the external environment.
Using such an apparatus for producing hot air with a temperature of about 100-150 ° C, for example, or for heating high-temperature heating, is not possible. At high pressure ratio (to obtain high temperatures in the compressor) for turbine temperature will be significantly less than zero. Last, as in analog (RF patent number 2,136,929), - a scientific problem, which hinders the use of high-performance (in terms of thermodynamics), air heat pumps, created on the basis of turbomachinery.
The closest analogue of the claimed method is a method for producing the hot air, which includes the expansion of the air in the turbine overexpansion to low temperatures, heat it in the first heat exchanger the recycling heat compression to the initial pressure in the booster compressor, heat extraction in the second nutrient exchanger and compressed dry air to the receiver ( cm. AS USSR 1262217, cl. 25 In the F 11/00, 1986).
The invention aims at a more efficient method for producing the hot air, wherein the temperature rise of the compressor does not communicate directly with the turbine for obtaining temperature below zero.
The problem is solved by the method for producing the hot air, comprising expansion air turbine overexpansion to low temperatures, heating it in a first heat exchanger heat-recovery heat compression to the initial pressure in the booster compressor, heat rejection in the second nutrient heat exchanger and the compressed dry air receiver according to the invention, the receiver is heated in air.
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Referring to Figure 1, which shows a gas-dynamic heater 1, which can be driven, for example, the electric motor 2. The unit includes an air turbine overexpansion 3, 4 heat recovery heat exchanger (first heat exchanger), booster compressor 5, the heater 6, for example, chemical products (second nutrient exchanger ) and the receiver 7.
Method is as follows
The 7 air receiver is heated by electric heaters (not shown). Dry air is supplied from the receiver 7 to the turbine overexpansion 3 (the temperature of the turbine is usually 0 ° C), heated in a heat exchanger utilizing compressed to 4 and the initial pressure in the receiver 7 in the booster compressor 5. The removal of heat in the heat exchanger 6 is due to the constancy of the conditions 7 in the receiver temperature.
For technical and economic analysis we turn to chart 2-4. Here (2 and 3) on the abscissa the temperature of the heating body (external temperature), and the ordinate axis - the temperature of the compressor (2) and the value of the coefficient of thermal (3):
= Cp · (T int -T ICT) / E 0,
where T IVT - heat source temperature (for compressor), T int - source of low temperature of the external coolant temperature, E 0 - power input.
For such machines (working with a temperature below zero degrees for a turbine) to achieve fuel ratio of the compressor 100-150 ° C is a good indicator.
In conventional heat pumps, using a freon, halocarbon, ammonia and others., It is possible to obtain a high fuel ratio (more > 2.5) when the difference between the cold and hot source of less than 40 ° C. The dependence of efficiency ( ) In heat pumps existing on the temperature difference at the inlet and outlet of the compressor shown in Figure 4. (P.A.Shelest, theory of heat and heat pumps, Engineering Technology, 2002, № 3 (37), s.122-123).
CLAIM
The method for producing the hot air, comprising expansion air turbine overexpansion to low temperatures, heating it in a first heat exchanger heat-recovery heat compression to the initial pressure in the booster compressor, heat rejection in the second nutrient heat exchanger and the compressed dry air, wherein the receiver that heated air receiver.
print version
Publication date 07.12.2006gg
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