RU2267703C1 - Gas radiation burner - Google Patents

Abstract

FIELD: the invention refers to gas radiation burner installations.

SUBSTANCE: the gas radiation burner for mutual incineration of hydrocarbon gas and abgas has a convergent tube, a gas muzzle located in the convergent tube, a diffuser, a metallic body, .a fireproof muffle on the surface of which incineration of the indicated mixture takes place. The burner has a secondary muzzle installed after the diffuser from which a gas-blast injects abgas which mixing with air-gas flow in the socket-mixer comes on incineration.

EFFECT: allows to incinerate gases with low heating calorific capability and also to reduce detrimental ejections.

1 dwg

Description

The invention is intended for use in the chemical, oil refining, metallurgical and other industries.

In these sectors, various gases are formed in the production processes that contain many harmful components and have a low calorific value, called gases. Abhaz are usually discharged under low pressure, and this makes their use difficult. The combustion of gases with a low content of combustible components is extremely difficult, since for poor mixtures the ignition temperature rises sharply, especially with a decrease in the concentration of combustible components, which makes it impossible to flare such gases. On the other hand, due to the low pressure of the gases, the gas velocity at the outlet of the nozzle is small and it is not possible to provide the injection of the required amount of air for their combustion. In addition, a large amount of ballast does not allow for sustainable burning. As a rule, most of these gases are emitted into the atmosphere or burned in open flares, as is done at refineries, which leads not only to significant heat loss, but also to air pollution.

There are various designs of radiation burners [1, 2]. But they are poorly adapted for burning gases of low calorific value. For example, burners of the VNIINeftemash, Neftekhimekologiya, Lummus, and other companies can only operate on hydrocarbon gases with a calorific value of at least 10,000 kJ / m ³ [3].

The aim of the present invention is to provide devices for burning gases of any calorific value and reduce harmful emissions into the atmosphere.

This goal is achieved in that the gas radiation burner, which contains a confuser, a gas nozzle located in the confuser, a diffuser, a metal body, a refractory muffle for burning this mixture additionally has a secondary nozzle installed after the diffuser, the gas jet from which injects gas, where, mixing with the gas flow in the mixer pipe, it enters the combustion. Combustion of the mixture (hydrocarbon gas, gas, air) takes place on a refractory hot surface, on which combustion reactions proceed even at minimal concentrations of combustible components in the mixture.

The gas radiation burner (see drawing) has the following elements: cap-divider 1, refractory muffle 2, metal body 3, nozzle-mixer 4, gas chamber 5, secondary nozzle 6, diffuser-mixer 7, gas nozzle 8, confuser 9, gas supply pipe 10, washer-flapper 11, exhaust gas pipe 12.

The burner operates as follows: fuel hydrocarbon gas at a pressure of 0.2-0.5 MPa is supplied to the nozzle 8, flows out of it at high speed and injects primary air (air I), the amount of which is regulated by the damper plate 11. Due to kinetic energy gas flowing from the nozzle 8, in the diffuser 7 there is an increase in the pressure of the gas-air mixture. To ensure the required pressure in the diffuser, a higher gas pressure in front of the nozzle is required than in the existing burners 8. The gas-air mixture at a pressure of 0.102-0.105 MPa enters the secondary nozzle 6, which is structurally made in the form of a pipe with a conical end. The gas through the pipe 12 enters the chamber 5. Due to the kinetic energy of the gas-air jet, the gas is injected into the mixer pipe 4, where a mixture of fuel gas, air and gas is formed. The gas mixture through the annular gap "i", formed by the divider 1 and the pipe 4, spreads over the surface of the burning stone (muffle) heated to 1100-1200 ° C and burns. In this case, through the annular gap "s" formed by the embrasure of the burner stone 2 and the nozzle-mixer 4, secondary air is sucked in, which enters through the openings in the housing 3. When the gas-air mixture is burned near the surface of the burner stone, its surface is heated to a temperature of 1100 -1200 ° С and serves as a source of radiant energy. Due to the relatively low combustion temperature (1000-1200 ° C), the formation of nitrogen oxides is negligible and does not exceed 100 mg / m ³ . But such a temperature is sufficient for the complete oxidation of all organic compounds contained in the exhaust gas. Thus, the proposed burner is environmentally friendly.

Information sources

1. Mukhina T.N., Barabanov N.L. et al. Pyrolysis of hydrocarbons. - M.: Chemistry, 1987 .-- 240s.

2. Burners for tube furnaces. VNIINeftemash catalog. - M.: TSNIITENeftemash, 1990.

3. Sulzhik N.I., Stepanov A.V. Resource conservation in petrochemical industries. - Kiev .: Nora-print, 2000.

Claims (1)

A gas radiation burner for co-burning hydrocarbon gas and gas containing a confuser, a gas nozzle located in the confuser, a diffuser, a metal body, a refractory muffle, on the surface of which this mixture is combusted, characterized in that it has a secondary nozzle installed after the diffuser, gas the jet from which the gas is injected and it, being mixed with the gas-air flow in the mixer pipe, goes to combustion.