JPS6063434A - Measurer for temperature in fluidized bed - Google Patents

Abstract

PURPOSE:To detect the temperature in a fluidized bed surely without wear and break of a temperature detector by providing a projecting part, which is projected from a gas dispersing means into the fluidized bed, and a temperature detecting means arranged in the projecting part. CONSTITUTION:A medium is made fluid by air passing through air injection holes 1a of a perforated plate 1, and the temperature of a fluidized bed 3 which is raised by combustion of fuel is transmitted to a thermocouple 6 through the wall of a thermowell 5, and the detected temperature in the bed is transmitted to a prescribed device through a cable 8. Since air for combustion is jetted also from air injection holes 7 formed on the side wall of a cylindrical body 2 in case of this temperature detection, the fluidized medium is flowed toward the outside of the thermowell 5 in the direction of an arrow to reduce the wear of the thermowell 5. Even if the thermowell 5 is worn, it can be replaced easily with a new thermowell with a thermocouple because the thermowell 5 is engaged with the cylindrical body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for measuring temperature within a fluidized bed.

The use of fluidized beds is attracting attention from the viewpoint of reviewing the use of coal due to changes in the petroleum situation and effective incineration of waste.

For example, when burning coal, it is possible to perform desulfurization in the bed by supplying a desulfurizing agent such as limestone while burning the coal in a fluidized bed, and there are advantages such as there being no need to install a separate desulfurization device.

In addition, in the field of waste incineration, it is possible to incinerate various types of waste, and in particular, it is also possible to incinerate incinerated ash (usually called JXP ash), a flame-retardant substance collected from combustion exhaust gas. Furthermore, various types of fluidized bed boilers have been proposed to effectively recover the heat generated in these fluidized bed furnaces. In particular, the combustion temperature must be controlled to ensure effective combustion, and the amount of air pollutants such as nitrogen oxides produced must also be reduced. In order to flow a fluid medium such as silica sand or cement clinker, if a temperature sensor (thermocouple) is placed in the fluidized bed so as to be in direct contact with the fluid medium, the temperature sensor will be worn out or damaged in a short period of time due to the movement of the fluid medium. On the other hand, there is a method to indirectly detect the temperature inside the layer by placing a temperature detector in the empty column to reduce wear, but in this case, the detection of the temperature inside the store is uncertain. It has to become something.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a temperature sensor that can reliably detect the temperature in a fluidized bed without causing wear or damage to the humidity sensor. be.

In short, the present invention is for measuring the temperature within a fluidized bed, and the present invention is for measuring the temperature within a fluidized bed. This is a temperature measuring device in a fluidized bed, which is equipped with a protrusion that protrudes into the IJN and a temperature detection means placed on the protrusion.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a perforated plate having a large number of air ejection holes 1a, and a cylindrical body 2 is arranged on this perforated plate 4 so as to protrude toward the fluidized bed 3 side.

The lower part of the cylindrical body 2 is open to the air chamber 4 side, and the upper part is formed into a dome shape to be airtight. However, forming it into a dome shape is not an essential requirement of this invention, and the upper part may be formed flat to make it easier to manufacture, but forming it into a dome shape does not inhibit the fluidization of the fluid medium. 7 is a plurality of air injection ports formed on the side wall surface of the cylindrical body, and it is necessary to make them thick in order to have an angle of repose that prevents the medium from entering the cylinder when the cylinder is at rest. It is. A thermowell 5 is screwed onto the top of the cylindrical body 2, and the inner wall surface of the thermowell 5 (inner wall top 19 in the case shown)
) is closely arranged with a thermocouple 6. The thickness of the top of this thermowell 5, that is, the part where the thermocouple 6 is arranged, is thinner than the other part, and the fluidized bed 3
The temperature is transmitted to the thermocouple 6 without any time delay (see FIG. 2).

In the above device, the medium is fluidized by the air passing through the air injection port 1a of the perforated plate 1, and the temperature of the fluidized bed 3, which has risen due to combustion of the fuel, is transmitted to the thermocouple 6 through the wall of the thermowell 5. The detected temperature inside the layer is transmitted to a predetermined device via a cable 8. During this temperature detection, combustion air is also injected from the air injection lower formed on the side wall of the cylindrical body 2, so the fluidizing medium flows toward the outside of the thermowell 5 as shown by the arrow in FIG. , reducing wear of the thermowell 5. Also, thermo well 5
Even if the thermowell 5 is worn out, the cylindrical body 2
Because it is screwed together, it can be easily replaced with a new thermowell with thermocouple.

By implementing this invention, the temperature within the fluidized bed can be accurately detected without wearing or damaging the temperature sensor.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a temperature measuring device in a fluidized bed according to the present invention;
FIG. 2 is an enlarged view of the thermocouple portion shown in FIG. 1. 1... Porous plate 2... Cylindrical body 3... Fluidized bed 5... Thermo sea urchin) v 6... Thermocouple 7・・・・・・Air injection port Figure 1 Figure 2

Claims (1)

[Claims] 1. A device for measuring the temperature within a fluidized bed, characterized by comprising a protrusion projecting from the gas dispersion means into the fluidized bed, and a temperature detection means disposed on the protrusion. Fluidized bed temperature measuring device. 2. The protruding part is a cylindrical body having one or more air injection ports on the side wall, a thermowell is protruded from the inner wall of the cylindrical body, and a thermocouple is tightly attached to the inner wall surface of the thermowell. Claim 1 characterized in that
Fluidized bed temperature measuring device as described in section. 3. The fluidized bed according to claim 1 or 2, characterized in that the thermowell and the cylindrical body are connected together, and the thermowell is detachably attached to the cylindrical body. Internal temperature measuring device.