JPS60126507A - Burning chamber - Google Patents

Abstract

PURPOSE:To reduce the NOx by achieving the sufficient mixing a two staged burning air with a flame or a burning gas by a method wherein a specific two staged burning air supply port is provided. CONSTITUTION:A two staged burning air supply port 5 is mounted at an adequate position separated from a burner 4. A nose buffer 2 is protruded into a burning chamber 1, the two stage burning air supply port 5 is provided on the nose buffer 2. The two stage burning air is supplied into burning chambers 1, 1' through the air supply port 5. Thereby, the range required for reaching of the two staged burning air is shortened, the two staged burning air pressure is reduced, also the two staged burning air can be supplied in divided manner. Further, the two staged burning air is supplied uniformly and continuously where a burning gas and a flame are made uniform condition after turned reversely and pressed by the nose buffer 2. Thus, the burning air and burning gas are mixed sufficiently, accordingly, the achievement of low NOx production due to the two staged burning in the burning chamber can be improved.

Description

[Detailed description of the invention] The present invention relates to improvements in combustion chambers.

It is well known that two-stage combustion is extremely effective for low NOx combustion in the combustion chamber, although the degree varies depending on the fuel.

However, depending on the shape of the combustion chamber, the second-stage combustion air does not mix well with the flame or combustion gas, and it is not possible to expect low NOx through the two-stage combustion.

Normally, air for second-stage combustion is supplied from the peripheral wall of the combustion chamber, so in combustion chambers where the distance from the peripheral wall to the center of the flame or combustion gas is large, the pressure of the second-stage combustion air is increased and a certain amount is supplied all at once. Otherwise, it will not reach the center of the flame or combustion gas.

However, increasing the pressure of the second-stage combustion air leads to an increase in power, and combining the second-stage combustion air leads to deterioration in the mixing of the second-stage combustion air, flame, and combustion gas.

On the other hand, in a boiler combustion chamber, a nose baffle is provided in the upper part of the combustion chamber, and the combustion gas flowing heterogeneously is reversed and mixed to cause residual oxygen and unburned matter to react.

The present invention attempts to solve the problems of the conventional combustion chamber by technical means implemented in the boiler combustion chamber.

That is, a nose baffle is protruded into the combustion chamber, a second-stage combustion air supply port is provided on the nose baffle, and the second-stage combustion air is supplied into the combustion chamber through the air supply port. This allows good mixing of the second-stage combustion air and the flame or combustion gas.

An embodiment of the combustion chamber of the present invention will be described below with reference to FIG. 1. Reference numerals 1 and 1' denote a combustion chamber, and 2 a nose baffle protruding into the combustion chamber 1.1', whose position is as shown by the conventional dotted line. The nose baffle 3 shown is also located below. Reference numeral 4 denotes a burner, which is provided in the lower part of the combustion chamber 1, and in this embodiment, on the front wall of the combustion chamber 1. Reference numeral 5 denotes a two-stage combustion air supply port, which is provided at the tip of the nose baffle 2 or at either or all of the upper and lower oblique portions; in this embodiment, the nose baffle 2
All of the above are provided.

Incidentally, the burner 4 may also be provided on the rear wall of the combustion chamber 1, and this is called an opposed burner. Nose baffle 2 is
It may be provided on the front wall of the combustion chamber 1' opposite to the one shown, at the same height or at a slightly higher or lower height, or it may be provided on both side walls.

2-stage combustion air supply port 5 in all or part of it.
may be provided as shown in the figure. The air supply port 5 for second-stage combustion is located at an appropriate distance from the burner 4, and can supply air for second-stage combustion with an appropriate direction, flow rate, and distribution to a position where NOx and unburned components in dust are low. It is possible to do so.

Since it is effective to supply air for two-stage combustion to two or more stages, upper and lower, the nose baffles 2 are provided at different heights on the front and rear walls, for example, so that air can be supplied from the respective relative positions of the nose baffles 2 on the front and rear walls. The air for two-stage combustion may be supplied to the upper and lower stages.

As described above, the combustion chamber of the present invention has a nose baffle protruding into the combustion chamber, an air supply port for second stage combustion is provided in the nose baffle, and air for second stage combustion is supplied into the combustion chamber through the air supply port. As a result, the distance required for the second-stage combustion air to reach is shortened, the pressure of the second-stage combustion air is reduced, and the second-stage combustion air can be supplied in parts. The second-stage combustion air is supplied uniformly and without gaps to the area where the combustion gas and flame have been reversed and narrowed to make them homogenized, and the two are mixed well, resulting in lower NOx emissions through the two-stage combustion in the combustion chamber. It has the excellent effect of improving

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the combustion chamber of the present invention. 1.1'... Combustion chamber 2... Nose baffle 4.
... Burner 5 ... Air supply port for two-stage combustion Applicant Kawasaki Heavy Industries, Ltd. j? , i′, = Fig. 1

Claims (1)

[Claims] A combustion chamber characterized in that a nose baffle protrudes into the combustion chamber, a two-stage combustion air supply port is provided in the nose baffle, and the second-stage combustion air is supplied into the combustion chamber through the air supply port. .