SU1506221A1 - Method and apparatus for drying agent - Google Patents

Abstract

The invention relates to the field of energy and can be used for heating greenhouses, drying grain, which allows reducing the content of harmful impurities in the combustion products. The method of preparation of the drying agent involves burning gaseous fuel, diluting the combustion products with cooling air, catalytic afterburning of micro-impurities. Before burning, the gaseous fuel is mixed with air in a ratio exceeding 1.5-2 times the stoichiometric ratio, the combustion products are fed with cooling air in a ratio of 1: (1.5-2.5) before being fed to the catalytic nozzle 4, and after catalytic afterburning the mixture obtained is further diluted with cooling air to achieve the technological parameters of the drying agent. The method is implemented in a burner device where gas is supplied to a jet-stabilizing mixer 9, after which it is mixed with air in the premixing chamber 8. The resulting mixture, the passage through the ceramic grid 7, is burned in the combustion chamber 3. At the outlet of chamber 3, the combustion products are cooled with dilution air in the dilution chamber 2 and are burned on the catalyst. After exiting the catalytic nozzle 4, the dilution air is mixed once more into the additional chamber 5, and the final drying agent is fed to the consumer. 2 sec. and 2 Cp. f-ly, 1 ill., 2 tab.

Description

3150

The invention relates to the field of energy and can b (.1t used for heating greenhouses, grain essentials, etc.

The object of the invention is to reduce the amount of harmful impurities in the drying agent.

The drawing shows a diagram of a burner device that implements the proposed method.

The device contains a dilution chamber 2 connected to the air inlet 1, at the entrance to which a combustion chamber 3 is installed, and at the exit a catalytic nozzle 4 is installed. The device contains an additional dilution chamber 5 connected to an autonomous air inlet 6

and downstream

the catalytic nozzle 4, the combustion chamber 3 is provided with a ceramic grid 7 at the entrance, inserted into the inside of the dilution chamber 2 and connected to the premixing chamber 8, in which the jet-stabilizing mixer 9 can be installed, and the catalytic nozzle 4 mb is made in the form of manganese catalyst-absorber. Nozzles 1 and 6 are provided with regulatory bodies 10.

The proposed method for producing a drying agent is implemented in the proposed burner device as follows.

The natural gas is fed to a jet-stabilizing mixer 9, from where the gas enters the pre-mixing chamber 8 through the expansion of the orifice, mixing with air jets. Carefully mixed fuel-air mixture in a ratio exceeding the stoichiometric 1.5-2 times, burns in the 3 combustion chamber on the ceramic grid 7. At the same time, as a result of the extreme excess of air and, as a result, low temperature, nitrogen oxides are formed in a small no more than 0.2 mg / m. In the dilution chamber 2, the combustion products are mixed with the cooling air supplied through the nozzle 1 in a ratio of 1: (1.5-2.5). In this case, the optimum temperature of the catalytic afterburning reaction is 400–700 ° C. The mixture obtained is fed to the nozzle 4, where the products of incomplete combustion (CO, formaldehyde) are burned.

I tO

15

20

25

35

 40 45 50 55

hydrocarbons). In chamber 5, the purified gases are mixed with air supplied through the nozzle 6 until the technological parameters of the coolant (t-100 C) are reached. The gas-cooled heat carrier is supplied to the consumer by a fan.

Examples of specific performance

ti mode. Natural gas is fed into

jet-stabilization, the mixer 9, from where it goes through the distributing holes, mixing with the air jets, enters the chamber 8

mix it up The mixed fuel-air mixture in a ratio that exceeds stoichiometric by 1.8 times, burns in the combustion chamber 3 on the ceramic grid 7. In this case, as a result of a large excess of air, the maximum flame temperature is 1240 ° C, nitrogen oxides are formed in the amount of not more than 0, 15 mg / m (in terms of drying agent). In the dilution chamber 2, the combustion products are mixed with the cooling air entering through the nozzle 1 at a ratio of 1: 2, while achieving an optimal catalytic afterburning reaction temperature of 550 ° C. The resulting mixture is fed to the nozzle 4, where products of incomplete combustion are burned. In chamber 5, the cleaned gases are mixed with air supplied through pipe 6 to achieve the technological parameters of the heat carrier (t-100 ° C). The gas-air coolant is supplied to the consumer by a fan.

Examples of the change in the mixing ratio of gaseous fuel with air in various ratios relative to stoichiometric are given in Table. one.

Examples of changes in the composition of the mixture fed to the catalyst are given in Table. 2

Claims (4)

1. A method of producing a drying agent by burning gas fuel, diluting the combustion products with cooling air and catalytic afterburning the mixture obtained, characterized in that, in order to reduce the amount of harmful impurities in the drying agent, gas fuel before burning is pre-mixed with air at an excess factor of 1.5-2.0, cooling air for dilution is fed in the amount of 1.5-2.3 times more combustion products, and after catalytic reburning the mixture obtained is diluted with additional cooling air. 2. An apparatus for producing a drying agent containing a dilution chamber connected to the air inlet at the entrance to which a combustion chamber is installed and a catalytic nozzle at the outlet, in order to reduce harmful impurities in the drying agent device contains camera pre mixing and an additional dilution chamber connected to an autonomous air nozzle and located along the stream behind the catalytic nozzle, the combustion chamber is provided with a ceramic grid at the entrance, inserted into the inside of the chamber diluted and connected to camera pre mix 3. Device PON.2, which differs from the fact that the pre-mixing chamber is additionally equipped with a jet-stabilizer mixer. I 4. The device according to PP, 2 and 3, is about the fact that the catalytic packing is made in the form of a manganese absorbing catalyst. Table 1 1400 1300 1250 1200 I 150 ten 1.5 1.5 1.5 Forms a lot of Shd and CO Impurities a little The same t The burner does not work steadily periodic flame separation Spreadsheets a 2