RU2399838C1 - Regenerative air heater - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: regenerative air heater containing housing, branch pipes for supply and removal of flue gases and air, tubular heat exchanger connected as to inlet and outlet to branch pipes for air supply and removal is equipped with impellers of free rotation in opposite directions, which are installed in branch pipes, and heat exchanger pipes and installed so that straight, vertical, through clearance is avoided.

EFFECT: reducing material consumption and complexity of the construction, decreasing thermal pollution degree and increasing air heater efficiency.

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Description

The present invention "regenerative air heater" relates to energy and can be used in boiler plants of thermal power plants.

Known regenerative air heater ("rotating regenerative air heater") [1], comprising a drive, a shaft, a rotor, a housing with inlet and outlet gas and air nozzles, upper and lower sector plates and a rotor divided by partitions into sectors with packing, at a distance of 0 , 5-0.7 equivalent diameter of the outlet gas pipe from the lower sector plate, perpendicular to the outlet gas pipe, a throttle valve installed in the form of a gate with a protrusion height of 0.10-0.17 is equivalent to the diameter of the outlet gas pipe. Italics are common features with the subject of the invention.

Its disadvantages are significant material consumption, design complexity and thermal pollution of the environment, as well as low efficiency, which is explained by the insignificant temperature difference of the flue gases at the inlet and outlet of the air heater and the need for energy costs to rotate its rotor.

Known regenerative air heater ("rotating regenerative air heater") [2], comprising a housing, nozzles for supplying and discharging flue gases and air, a drum divided into sectors and rotating by an actuator on a shaft fixed in thrust and thrust bearings, internal the volume of sectors is filled with gasket, seals are installed between the gas and air inlets and outlets, and gas and air inlets and outlets are made on the cylindrical surface of the casing, as packing in sec bulk materials were used in the tori, the packing was divided in height into sections that begin and end with pairs of ducts that form a cavity and are installed with a convex surface down, in the upper duct in the central part, and holes are made in the lower duct in the peripheral part between gas supply and exhaust pipes and air over the entire height of the cylindrical surface of the casing are two additional nozzles, in additional nozzles and in the cavity formed by the lower end surfaces of the drum and the casing, made d Flue gas at a pressure equal to the air pressure in the air preheater, the cylindrical top and bottom surface of the housing and along the periphery of the pipes for additional input gases mounted peripheral seal. Italics are common features with the subject of the invention.

Its disadvantages are significant material consumption, design complexity and thermal pollution of the environment, as well as low efficiency, which is explained by the insignificant temperature difference of the flue gases at the inlet and outlet of the air heater and the need for energy costs to rotate its rotor.

Known as being closer in technical essence to the subject of the invention, a regenerative air heater (“regenerative rotating air heater”) [3, 4], comprising a housing, nozzles for supplying and discharging flue gases and air, three support beams rotating on a vertical shaft mounted in thrust and thrust bearings, a rotor (drum) equipped with two layers of heat-exchange packing, enclosed in bags in the form of rotor cells; system of radial, axial and circumferential seals; electromechanical gear drive and devices for water washing, steam blowing, fire extinguishing, raising the rotor, etc. Italicized are common signs with the subject of the invention.

Its disadvantages are significant material consumption, design complexity and thermal pollution of the environment, as well as low efficiency, which is explained by the insignificant temperature difference of the flue gases at the inlet and outlet of the air heater and the need for energy costs to rotate its rotor.

The objective of the invention is the reduction of material consumption and design complexity, reducing the degree of thermal pollution of the environment and increasing the efficiency of the air heater.

The technical result is achieved in that a regenerative air heater comprising a casing and nozzles for supplying and discharging flue gases and air is supplied with a tubular heat exchanger connected at the inlet and outlet with nozzles for supplying and discharging air, and the pipes for supplying and discharging flue gases are connected to impellers of free rotation in opposite directions of rotation are installed in the housing at different levels and in the nozzles, and the heat exchanger tubes are installed with the exception of a direct, vertical, through clearance.

The regenerative air heater is depicted in figure 1, and its heat exchanger is shown in figure 2.

The regenerative air heater comprises a housing 1, nozzles for supplying 2 and venting 3 air, nozzles for supplying 4 and venting 5 flue gases, a tubular heat exchanger 6 connected by pipes 7 at the inlet and outlet with nozzles for supplying 2 and venting 3, respectively, and the nozzles for supply 4 and exhaust 5 of flue gases, connected to the housing 1 at different levels, and the pipes 7 of the heat exchanger 6 are installed with the exception of direct through, vertically, clearance and in the nozzles 2 and 3, 4 and 5 impellers 8 are installed free in opposite directions eniyah rotation.

Regenerative air heater operates as follows.

The heated air is passed sequentially through the pipe 2, through the space of the impeller 8, through the pipes 7 of the heat exchanger 6, through the space of the impeller 8 and through the pipe 3. The flue gases are passed sequentially through the pipe 4, through the space of the impeller 8, between the pipes 7 of the heat exchanger 6, through the space of the impeller 8 and through pipe 5. In this case, the impellers 8 at the inlets and outlets of the air and flue gases rotate in opposite directions, thereby enhancing the turbulence of the air and gas flows. Flue gases flowing outside thin-walled pipes 7 of sufficient thermal conductivity, transfer part of the thermal energy to the air in the pipes 7.

The use of a tubular heat exchanger reduces the material consumption of a regenerative air heater, eliminates the use of a forced drive of the heat exchanger, and also reduces the temperature of the flue gases at the outlet and reduces thermal pollution of the environment, as well as reduce energy loss, which increases the efficiency air heater.

Information sources

1. Hannanov R.R. Rotating regenerative air heater. Patent RU No. 23234114, F23L 15/02, bull. No. 29, 10.20.2008.

2. Stepanov L.V. Regenerative rotating air heater. Application RU 2007113246, F22B 1/00, bull. No. 13, May 10, 2008.

3. Migai V.K., Nazarenko V.S., Novozhilov I.F., Dobryakov T.S. Regenerative rotating air heaters. - L .: Energy, 1971, - 168 p.

4. Ninua N.E. Regenerative rotating air heater. -High School, 1965.

5. Dobkin G.I. Continuous regenerative air heaters. - State Publishing House of the BSSR, 1936.

Claims (1)

Regenerative air heater, comprising a housing, nozzles for supplying and discharging flue gases and air, characterized in that a tubular heat exchanger is connected to it, connected at the inlet and outlet with nozzles for supplying and discharging air, and in the nozzles for supplying and discharging flue gases and air impellers are installed in free, in opposite directions of rotation, and the heat exchanger tubes are installed with the exception of a direct, vertical, through lumen.

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