JPS59164815A - Control of fire grate temperature - Google Patents

Abstract

PURPOSE:To protect a fire grate and check the generation of NOx by a method wherein the surface temperature of the fire grate of a combustion furnace equipped with a moving-grate stoker is measured and the flow rate of fire grate temperature control liquid to mix with combustion air is controlled in response to the surface temperature of the fire grate. CONSTITUTION:The fuel fed in a combustion furnace 2 by a fuel feeder 1 falls down on a moving-grate stoker 3 and is completely burnt by combustion air 5 supplied from wind boxes 4. The combustion gas 6 is discharged from the upper part of the combustion furnace 2 and at the same time the combustion ash is discharged from an ash discharge port 7. At this time, proper quantities of recirculating gas 8 is introduced through the wind boxes 4 located adequately to the moving-grate stoker 3 by means of a fire grate temperature measuring device 11. Consequently, the fire grate is prevented from being burnt-out and at the same time the formation of clinker and generation of NOx can be checked.

Description

[Detailed description of the invention] The present invention relates to a method for regulating grate temperature.

With the depletion of petroleum resources, the use of solid fuels such as coal, coke, park, and waste tires has been increasing in recent years, and one effective method for burning these is the grate combustion method. Of these, the most typical continuous combustion type is the bed grate type combustion device.

In this type of bed grate type combustion device, for example, the first
As shown in the diagram, the combustion furnace 2 is
The fuel supplied inside falls onto the bed grate 3 and is completely combusted by the combustion air 5 supplied from the wind box 4, and the combustion gas 6 is discharged from the upper part of the combustion furnace and becomes combustion ash. is discharged from the ash discharge lower.

At this time, a part of the combustion gas 6 is cooled as recirculation gas 8 by an air preheater 9, and then its flow rate is adjusted by a manual damper 10, and then passed through the wind box 4. Since there is no means to measure the grate temperature, it is impossible to maintain the grate temperature at an appropriate value by adjusting the introduction position and amount of recirculation gas. The grate often burns out due to the occurrence of

The present invention was proposed in view of the above circumstances, and aims to provide a grate temperature adjustment method that prevents burnout of the grate. The present invention is characterized in that the amount of grate temperature adjusting fluid mixed into the combustion air is adjusted according to the grate surface temperature.

Embodiments of the present invention will be described with reference to the drawings. FIGS. 2 and 3 are system diagrams showing the first and second embodiments, respectively.

In the above figure, the same symbols as in FIG.
This is a temperature controller that adjusts the opening degree of the valve.

At the end of such a device, there is a grate surface temperature measuring device 1.
111c, an appropriate amount of recirculating gas 8 is introduced into the bed grate 3 through the wind box 4 at the appropriate location, so that the grate surface temperature is maintained within the allowable value range and damage to the grate is prevented. ~
In addition, clinker formation and NOx generation can also be suppressed.

Next, in the second embodiment shown in FIG.
to be introduced.

Even in such a device, the grate surface temperature is maintained within the allowable value by introducing an appropriate amount of water vapor into the grate using the grate surface temperature measuring device, and the grate surface temperature is maintained within the allowable value, and the effect is substantially the same as that of the first embodiment. can be played.

In short, according to the present invention, the grate surface temperature of a combustion furnace having a bed grate is measured, and the amount of grate temperature adjusting fluid mixed into the combustion air is adjusted according to the grate surface temperature. The present invention is extremely useful industrially because it provides a method for regulating grate temperature that protects the grate and suppresses the generation of NO'x.

FIG. 1 is a system diagram showing the grate temperature control procedure in a known bed grate combustion apparatus, and FIGS. 2 and 3 are system diagrams showing the first and second embodiments of the present invention, respectively.

1... Fuel supply machine, 2... Combustion furnace, 3... Bed grate, 4... Wind box, 5... Combustion air, 6... Combustion gas, 7... Ash Discharge port, 8... Recirculation gas, 8a
... water vapor, 9... air preheater, 10a... flow rate adjustment damper, 11... grate temperature measuring device, 12...
・Temperature controller.

Sub-Agent Patent Attorney Masafumi Tsukamoto

Claims (1)

[Claims] A combustion furnace having a bed grate, which measures the surface temperature of the grate, and adjusts the amount of grate temperature adjustment fluid mixed into the combustion air according to the surface temperature of the grate. Method.