JPH0330042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluidized bed boiler apparatus, and more particularly to a fluidized bed boiler apparatus in which thermal shock in a steam engine is minimized.

Fluidized bed boilers are widely used in various fields such as power plants in the current energy crisis because they can burn low-grade coal and other fuels well and have high heat transfer characteristics to heat transfer coils. .

However, in a fluidized bed boiler, the amount of fluidizing medium increases as the amount of steam generated increases, and the time required for the fluidizing medium to heat up to a temperature suitable for burning the materials to be incinerated increases. Various problems have been raised regarding startup and control after normal operation, such as prevention of burnout of the superheater or reheater. Further, there are problems such as a delay in start-up time and control due to an increase in the amount of fluidized medium, and an increase in the amount of auxiliary fuel. Furthermore, since the total heat transfer amount of a fluidized bed boiler is determined by the total heat transfer area of the heat transfer coils arranged in the fluidized bed, there is a problem that it is difficult to freely adjust the evaporation amount of the boiler.

In order to solve the above problem, it has been proposed to divide the fluidized bed chamber into a plurality of chambers and fluidize any number of the chambers to perform operation corresponding to various loads.

However, in the above method, the superheater and reheater are usually arranged in different fluidized bed chamber(s), so the temperature of the steam heated in the superheater and reheater is different, and the steam prime mover ( generates a thermal shock when entering the turbine),
Damage to the turbine may occur.

An object of the present invention is to provide a fluidized bed boiler apparatus that minimizes the temperature difference between the steam generated in a superheater and a reheater and reduces thermal shock on a steam engine.

The present invention is characterized in that in a fluidized bed boiler apparatus having a fluidized furnace divided into a plurality of fluidized bed chambers, a superheater and a reheater are arranged in the same fluidized bed chamber and heated under the same conditions. do.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a sectional view of a main part of a fluidized bed boiler apparatus showing one embodiment of the present invention. In the figure, a fluidized bed boiler 1 includes air boxes 3A and 3B divided into two chambers by a partition wall 2, and a perforated plate 4 above the air boxes 3A and 3B.
A and 4B, fluidized beds 5A and 5B of fluidized medium and fuel formed on the perforated plates, superheaters 6A and 6B and reheaters 7A and 7B arranged in each of the fluidized beds. Fluidized beds 5A and 5B are connected to air blower 9, dampers 10A and 10B, and air box 3.
It is formed by fluidizing a fluid medium (sand, ash, etc.) and fuel (coal or other solid combustible material) by air blown through A, 3B and the perforated plates 4A, 4B. Note that an evaporator 8 is provided in the upper part of the furnace. Drum and evaporator in the boiler 8
The steam generated in
be guided by The reheaters 7A and 7B heat the steam whose temperature has been lowered by expanding once in the steam engine, and each end is connected to the steam engine.
The high-temperature superheated steam generated by reheating is again supplied to the steam motor.

According to the above embodiment, the superheater 6A and the reheater 7A
are placed in the same fluidized bed chamber 5A, and the superheater 6B and reheater 7B are placed in the same fluidized bed chamber 5B, so they can be heated under the same conditions, and the superheater and reheater can each It is possible to eliminate the temperature difference in superheated steam supplied to the steam engine, and to significantly reduce thermal shock.

In the above embodiment, the fluidized bed chamber is divided only by the air box, and the fluidized beds 5A and 5B are not particularly partitioned, but they can be partitioned by partition walls if necessary.

As described above, according to the present invention, since the superheater and the reheater are arranged in the same fluidized bed chamber, even when operating the fluidized bed chamber in response to various loads, the temperature difference of the superheated steam entering the steam prime mover can be reduced. It is possible to prevent distortion and damage to the steam motor due to thermal shock.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the main parts of a fluidized bed boiler device showing one embodiment of the present invention. 1... Fluidized bed boiler, 3A, 3B... Air box, 5A, 5B... Fluidized bed, 6A, 6B... Superheater, 7A, 7B... Reheater.

Claims (1)

[Claims] 1. A fluidized bed boiler device having a fluidized furnace divided into a plurality of fluidized bed chambers, characterized in that a superheater and a reheater are arranged in the same fluidized bed chamber.