SU1350464A1 - Gas-distributing grate - Google Patents

Abstract

The invention relates to the field of use of solid fuels and can be applied in boilers for boilers with a device of fluidized bed furnaces. The purpose of the invention is to increase the reliability and efficiency of the gas distribution grid. The gas distribution grid comprises a distribution manifold 2 with an internal unit 1 and an external unit 4 connected respectively to two rows of distributing 3 and collecting 6 pipes. The pipes 6 are connected to each other in a single panel in which the nozzles 11 are installed. Cooling medium is supplied to the dispensing manifold 2 of the grille, which through dispensing pipes 3 enters the collecting pipes and bivides in the opposite direction into the collecting manifold 5. under pressure, simplified manufacturing (no bent tube elements, pressed knees), and also achieving uniformity of cooling of the lattice with virtually no temperature sweeps. 3 il. i (Ln / 11 in. 5 Z 1 1 15 пь СО ate about 4 О5 4;

Description

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The invention relates to the field of use of solid fuels and can be applied in boiler building, for boilers with a device of fluidized bed furnaces.

The purpose of the invention is to increase reliability and efficiency.

FIG. 1 shows a diagram of the gas distribution grid; FIG. 2 is a section A-; and in FIG. 1j in FIG. 3 shows an embodiment of a grid collector.

The gas distribution grid comprises an internal unit 1 consisting of a distribution manifold 2 connected symmetrically to two rows of distribution pipes 3, an external unit 4 comprising a collection manifold 5 connected symmetrically to two rows of collecting pipes 6 having bottom ends 7.

The inner 1 and outer 4 blocks are fixed between each other by spacer elements 8.

The outer tubes 6 are connected to each other in a single panel by 9 membranes.

10, in which nozzles (caps) are installed in rows with a certain pitch

11. If necessary, stiffening ribs 12 are installed across the pipes. The box 13 for supplying the gas-air mixture is rigidly connected to the grill, at the same time being its support.

In addition, the grille has fuel supply devices 14 and 15 and spruce algae burned out.

Hatches for slag removal are conventionally not shown.

The grille can be made welded or combined with partial use of threaded joints.

Gas distribution grid works as follows.

Coolant is supplied to the dispensing manifold 2 of the grill, for example from a boiler path. From the collector 2, the medium flows through the distribution pipes 3 to the collecting pipes 6, then enters the collecting collector 5 in an annular cross-section in the opposite direction, from where it returns to the boiler path through the discharge pipe.

A layer of granular material (coal, ash, limestone, and others) is organized by top or with the help of fuel supply devices 14. Under the grill of the box 13 is served gases

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(air, flue gases from the boiler or their mixture), which, when passing through the nozzles (caps) 11, cause the layer of material to randomly move in suspension (boil). From a foreign source, the layer is heated, ignited, and then the fuel is continuously injected, where Q is burned or partially gasified at 600-900 °.

The fluidized bed heats the external elements of the lattice: pipes 6, membranes 10, nozzles (caps) 11 and a collector

5 5. This heat is perceived by the working medium. The nozzles (caps) 11 are mainly cooled by gases entering through the layer at high speed (70-80 m / s) through them.

2Q For partial drainage of the fluidized bed - during operation and draining of the bed before repairing the grate, drain devices 15 are used, and to remove slag and large sintered

25 pieces, formed in violation of the normal operation of the boiler and the grate, use special hatches (not shown).

This gas distribution device of the grid can be widely used for the modernization of existing boilers operating on ballastised fuels that are significantly different from the design ones. When installed in a cold funnel of the gas distribution grid and organizing a fluidized bed on it, the boiler restores the nominal steam capacity lost due to various reasons, receives a reserve for dusty systems performance, reduces the consumption of liquid fuel, increases the load control range, reduces emissions by 2-3 times. nitrogen oxides and reduces emissions of sulfur an35

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hydride.

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Claims (1)

Invention Formula Gas distribution grid containing one or more all-welded membrane panels-sections composed of concentrically arranged pipes with air (gas) inlet devices, fuel supply, discharge of burned-out residues and slag removal, connected to two or more headers, which is in order to increase reliability and efficiency, the membrane panel of the G-section of the lattice is made in the form of concentrically located external and internal blocks, and the internal unit is designed as a distributing collector, nennogo with Cooling outlet - Air supply (gas) for common environment FIG. 2 one or symmetrically with two rows of distributing pipes, respectively, the external unit is designed as a collecting manifold with rows of collecting pipes connected by bridges (membranes).  Pue.j Editor N. Gunko Compiled by L.Motsuk Tehred M.Hodanich Order 5248/38 Circulation 543Subscribe VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 . production and printing company, Uzhgorod, st. Project, 4 Proofreader A.T. sko