SU1657867A1 - Furnace with fluidized bed - Google Patents

Abstract

Invention m. used in solid fuel boilers with a narrow temperature range of the combustion process. The purpose of the invention is to increase the reliability of operation and heat transfer rate. The fluidized bed furnace contains a combustion chamber 1 equipped with a heat exchanging device made of heat exchange tubes 3 installed with the possibility of vertical movement, the tubes 3 being bent in the form of a sinusoid and inclined on either side of the vertical, the slope being and 5-15?, which provides a constant maximum heat transfer coefficient. The ability to raise the heat exchanger above the bed also creates additional conveniences for repairs, helping to improve its quality. 1 z.p, f-ly, 2 ill. Soda o ate h | 00 O -CH Figure 1

Description

The invention relates to fuel combustion devices and can be used in solid fuel boilers with a narrow temperature range of the combustion process.

The aim of the invention is to increase the reliability of operation and heat transfer rate.

Figure 1 shows the furnace with a fluidized bed, a cross-section; figure 2 - section aa in figure 1.

The fluidized bed furnace contains a combustion chamber 1, equipped with an air distribution grill 2 and a heat exchange device made of heat exchange pipes 3 connected to horizontal manifolds 4 and installed with the possibility of vertical movement. Here, the heat exchange tubes 3 are curved in the form of a sinusoid and are inclined on opposite sides of the vertical, the angle of inclination being equal. Heat exchange tubes can be provided with each longitudinal ribs (not shown). The firebox is equipped with a supply line 5 and lifting mechanisms c.

The fluidized bed works as follows.

The water from the supply line 5 through the horizontal manifold 4 is distributed through heat exchange pipes 3, where it is heated to the required temperature. In this case, with the help of lifting mechanisms 6, the heat exchange device is installed at a height that provides the necessary heat sink. In accordance with it, the fuel supply to the bed is established. The heated water is collected in the output horizontal collector 4. At the same time, a stable and reliable fuel combustion is ensured in the entire volume of chamber 1 due to uniform distribution of immersed sections of heat-generating pipes 3 over the horizontal section of the fluidized bed in the absence of stagnant zones in it. There is a uniform eat

heat throughout the fluidized bed without the formation of ash cakes or the organization of zones with local freezing of combustion. The fluidized bed furnace is started while the heat exchanging device is raised above the layer, which ensures reliable ignition with low consumption: starting fuel due to the minimal heat removal from the fluidized bed. Ability to raise heat exchange

The device above the fluidized bed chamber creates additional conveniences for repairs, contributing to the improvement of its quality. The bending of the pipe 3 in the form of a sinusoid and their arrangement with a slope on opposite sides of

verticals with a slope of 5-15 ° provides a constant maximum heat transfer coefficient.

Claims (2)

1. A fluidized bed furnace containing a combustion chamber fitted with an air distribution grill and heat exchange device made of at least two bent pipes connected to horizontal manifolds and installed with a displaceable feature, in order to increase the reliability of operation and heat exchange intensity, at least the two heat exchanger tubes mentioned are installed with the possibility of vertical displacement, are bent in the form of a sinusoid and are located in planes inclined by Etrichno relative to the vertical at an angle of 5-15 °. 2. The interpretation according to claim 1, of which it is. that heat exchanger tubes are equipped with each longitudinal ribs.