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INVENTION
Patent of the Russian Federation RU2145050
GAS HEATER
The name of the inventor: Kurbanov AZ; Kreinin E.V.
The name of the patent holder: OOO "Teploservis"
Address for correspondence: 346000, Rostov region, Kamensk-Shakhtinsky, Bashkevich st., D. 72, sq. 59, Kurbanovu AZ.
Date of commencement of the patent: 1998.06.01
The gas air heater is designed for use in decentralized heating systems of various production facilities. The air heater contains a gas-burning device, gas combustion chambers and mixing of purified combustion products with heated air, a blower fan attached to the combustion chamber, a heat exchanger in the form of a curved tube on the outer surface of which mesh intensifiers are mounted, at the end of the heat exchanger there is installed a catalytic nozzle, at the inlet In which a gas supply nozzle is provided for supplying an additional limited volume of natural gas. The gas-burning device is designed as an automated burner unit with multi-stage gas combustion, which provides for an increased completeness and simplicity of design, and thanks to the installation of the catalytic nozzle, only combustion products are subjected to cleaning at the end of the heat exchanger and the required mass of the catalytic nozzle is reduced.
DESCRIPTION OF THE INVENTION
The invention relates to the technique of mixing gas heat generators used in decentralized heating systems of various production facilities.
A mixing air heater is known in which a gas is burned in a multi-flare burner and then the combustion products are diluted with cold air [1]. The disadvantage of the known air heater is the content of harmful components in the coolant: CO - up to 6 mg / m 3 , NO x - up to 1.5 mg / m 3 .
The closest to the invention is a heat generator in which a gas-burning device is made in the form of a burner assembly with swirlers for better mixing of gas with air for combustion, there is a common combustion chamber at the outlet of which, after diluting the combustion products with air, a lattice with a catalytic surface is installed [2]. The disadvantage of this known solution is the complexity of the design and its operation, and the fact that the entire mass of the coolant is subjected to catalytic action, and not part of it, which is the products of gas combustion and containing all harmful impurities.
The purpose of the invention is to simplify the design and modes of its operation.
The aim is achieved by the fact that in a known mixing air heater device containing a gas-burning unit, gas combustion chambers and mixing of combustion products with heated air, a catalytic nozzle installed at the outlet of the combustion products from the combustion chamber, a blower fan, a gas-burning device is made in In the form of a self-contained automated unit, a heat exchanger in the form of a bent pipe is attached to the combustion chamber of the burner block, the mesh intensifiers are mounted on the outer surface of the heat exchanger, a catalytic nozzle is mounted on the end of the heat exchanger, and at the end of the heater, a mixing chamber of the purified combustion products and heated air from the blower fan .
In addition, in order to optimize the operation of the catalytic mass, a nozzle at the inlet to it is provided with a gas supply nozzle for supplying a limited volume of natural gas.
Comparable analysis shows that the proposed technical solution, unlike the prototype, provides increased completeness and simplicity of construction by performing a gas-burning device in the form of an independent automated burner unit with multi-stage combustion of gas. The heat exchanger is made in the form of a curved pipe with net intensifiers mounted on it, and a catalytic nozzle is mounted on the end of the apparatus. Due to this catalytic "cleaning" only the products of gas combustion are exposed, and not the entire heat carrier (as in the prototype), which reduces the required mass of the catalytic nozzle. Approach 1% CH 4 (from the volume of combustion products) to the catalytic mass optimizes its operating conditions (additional oxidation on the surface of the catalyst). All these differences make it possible to conclude that the proposed invention complies with the criterion of "novelty".
The features distinguishing the proposed technical solution from the prototype have not been revealed in other solutions when studying this and related fields of technology. In addition, they provide the proposed invention with the simplicity of design and the optimality of the regime parameters of gas combustion and its purification from harmful components (CO and NO x ). The set of the listed differences of the declared device gives the basis for a conclusion about conformity to its criterion "essential differences".
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In Fig. 1 and 2 shows the design of the claimed gas heater.
The air heater contains a self-contained automated burner unit 1, the combustion chamber of the unit passes to the heat exchanger 2, on the outer surface of which the mesh intensifiers 3 are mounted. In the heat exchanger 2, the combustion products from the block 1 are cooled by heat exchange with air coming from the fan of the supercharger 4. At the end of the heat exchanger 2, a catalytic nozzle 5 is installed. To optimize the operation of the catalyst in the nozzle 5, 1% of the methane from the volume of the combustion products is fed through the gas supply pipe 6 to the latter. The "cleaned" combustion products are mixed with the heated air in the mixing chamber 7.
The gas mixing air heater works as follows.
Depending on the required heat output, the corresponding samples of the automated burner unit 1 and the blower fan 4 are selected.
The burner in block 1 is characterized by a multi-stage (three air supply) principle of gas combustion, which ensures a minimum yield (concentration) of NO x , and taking into account the kinetic combustion of gas ( a 1~ 0.2-0.4) and the minimum yield of CO.
The catalyst in the nozzle 5 requires rather strict temperature operating conditions (600-700 ° C), and additional methane supply (oxidation on the surface of the catalytic nozzle).
As a result, in the heat exchanger 2, the combustion products leaving the combustion chamber of the unit 1 are cooled to the desired temperature (600-700 ° C.). Intensive heat exchange between them and cold air is facilitated by grid intensifiers mounted on tube 2. The integral heat transfer coefficient rises by 3-4 times.
In the catalytic packing 5, only the volume of gas combustion products is purified, which naturally affects (in contrast to the analog and prototype) on its size and resource.
The combustion products from the nozzle 5 are mixed in a mixing chamber 7 with heated air.
The automatic control system of the mixing air heater provides the interrelation of the following parameters: air flow from the fan-blower 4, the heat output of the automated unit 1, the temperature of the combustion products at the inlet to the catalytic nozzle 5, the required temperature of the coolant at the outlet from the mixing chamber 7.
It is planned to create a number of claimed air heaters for thermal power from 0.5 to 2.5 MW. The air heating temperature is up to 110 o C. The fuel utilization factor is ~ 100%. Absence of carbon monoxide (CO) and nitrogen oxides (NO x ) in the coolant.
This device will be the most effective means for decentralized heating of various facilities, which will reduce the specific fuel consumption by 3-5 times and significantly reduce operating and capital costs.
INFORMATION SOURCES
1. Author's certificate No. 1513338, cl. 4 F 24 H 3/02, 1993.
2. Author's certificate N 1814016 A1 6 F 26 In the 23/02, 1993.
CLAIM
1. A gas-fired air heater comprising a gas-burning device, gas combustion chambers and mixing of combustion products with heated air, a catalytic nozzle at the coolant outlet, and a blower fan, characterized in that the gas-burning device is designed as an automated burner unit with a multi-stage combustion of gas; The combustion chamber of the burner unit is attached to the heat exchanger in the form of a curved tube, on the outer surface of which mesh intensifiers are mounted, at the end of the heat exchanger there is installed said catalytic nozzle and at the end of the stove there is mounted a mixing chamber of the purified combustion products and heated air from the fan-heater.
2. The gas heater according to claim 1, characterized in that a gas supply nozzle is provided at the inlet to the catalytic nozzle for supplying an additional limited volume of natural gas.
print version
Date of publication 26.03.2007гг
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