JPH0443691Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] The present invention uses an industrial furnace such as a boiler furnace as a furnace body, and a solid fuel such as pulverized coal or pulverized oil coke (hereinafter simply referred to as This invention relates to a cyclone coal combustion device equipped with a pre-combustion chamber that burns coal (referred to as coal) using swirling air for combustion.

[Conventional technology]

BACKGROUND ART Conventionally, industrial furnaces such as boiler furnaces have been known in which a cyclone coal combustion device is provided as a forehearth in the furnace body to partially burn coal. Industrial furnaces equipped with such forehearths are widely used because of their excellent combustion effects.

As an illustration of the structure of the conventional cyclone coal combustion equipment mentioned above, for example,
As shown in Publication No. 60-76717, pulverized coal is partially combusted by supplying pulverized coal and air into a cyclone coal combustion device and effectively mixing and combusting them as a high-speed swirling flow. structure is disclosed. That is, the third
As shown in the figure, a cyclone coal combustion device 2 is installed laterally on the side wall of a furnace 1 such as a boiler furnace, and this cyclone coal combustion device has a coal input port 3, an air supply port 4, and a gas conductor for guiding combustion gas to the furnace. A slag butthole 6 is provided inside the cyclone coal combustion device 2 for passing combustion gas generated in the device 2 and damming up molten slag, and a downward slag flow port is provided on the upstream side of the slag buttful for combustion gas. 7 is described. 8 is a slag tank, 10 is a combustion chamber, 11 is a bypass line, and 12 is a flame.

[The problem that the idea aims to solve]

Conventional horizontal cyclone coal combustion equipment is cylindrical and blows coal into the cyclone body from the upstream side in an axial direction or in a tangential direction.
Since swirling air for combustion is blown in tangentially from the upstream side of the cyclone body, the swirling force within the cyclone body is insufficient, and the flow of combustion gas is also directed from the coal/air injection section to the downstream outlet. In the past, the slag was passed through almost in one go, so the residence time was short and the combustion efficiency did not improve much, and in order to increase the slag collection rate, secondary collection means such as slag buttfuls and slag screens were required. Ta.

The present invention was developed in view of the above points.The cyclone body is made into a substantially cylindrical shape, and the large diameter part of the cyclone body is attached to the side wall of the furnace through a gas communication port, and the large diameter part of the cyclone body is attached to the top surface of the large diameter part of the cyclone body. A vertical swirling downflow type pre-combustion chamber is connected in the tangential direction, and the entire amount of coal and the entire amount of combustion air excluding the second-stage combustion air is supplied to the pre-combustion chamber for pre-combustion, and high-temperature combustion gas is produced. High combustion efficiency and high slag removal rate can be achieved by supplying the cyclone from the downstream end of the cyclone body for continuous combustion and generating a reverse swirling flow. The purpose of this invention is to provide a cyclone coal combustion device that does not require the installation of a cyclone coal combustion device.

[Means to solve the problem]

The cyclone coal combustion apparatus of the present invention will be described with reference to FIGS. 1 and 2. The large-diameter portion of the approximately conical cyclone body 15 is connected to the side wall of the furnace 1 with gas inlet 5 in the lateral direction. A vertical swirling downflow type pre-combustion chamber 16 is connected tangentially to the upper surface of the large diameter part of the cyclone main body 15, and a slag flow outlet 7 is provided on the lower surface of the cyclone main body 15. A coal input port for supplying the entire amount of coal necessary for combustion and a swirling air supply port 18 for combustion are provided in the upper part, and in the gas communication port 5, a portion below the connection between the pre-combustion chamber 16 and the cyclone body 15 is provided. On the side, the swirling gas from the pre-combustion chamber 16 is guided to the small diameter part of the cyclone body 15, and then reversed to the gas communication port 5.
It is characterized by the provision of a buttful 20 for guiding.

In the present invention, the swirling air for combustion needs to be supplied in the tangential direction of the pre-combustion chamber, but the coal may be supplied either in the tangential direction or in the axial direction of the pre-combustion chamber.

[Effect]

The entire amount of coal and the entire amount of combustion air excluding air for second-stage combustion are supplied to the pre-combustion chamber 16, and the coal is pre-combusted while swirling, producing high-temperature combustion gas, and this combustion gas is sent to the downstream end of the cyclone body 15. Supplied from. For this reason, the ignited coal particles and combustion gas flowing near the wall in the cyclone body are accelerated by stronger centrifugal action, promoting combustion and improving the ash (slag) collection rate.

In addition, by providing the Batsuful 20 within the cyclone body, the swirling flows of forward and reverse directions appear strongly, and the coal particles are sufficiently diffused within the cyclone body, and the residence time of the coal particles within the cyclone body is increased. This improves combustion efficiency.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. However, unless there is a specific description, the shapes of the components described in this example, their relative positions, etc. are not intended to limit the scope of the present invention, but are merely illustrative examples. Only.

Reference numeral 15 denotes a substantially conical cyclone body, and the large diameter portion of this cyclone body 15 is laterally attached to the side wall of the furnace 1. A vertical swirling downward flow type pre-combustion chamber 16 is connected tangentially to the upper surface of the large diameter portion of the cyclone body 15, which is a substantially cylindrical body with a substantially conical body connected to the lower part thereof. A slag outlet 7 is provided in the large-diameter portion of the lower surface of the cyclone body 15, and coal and
A primary air supply port 17 and a combustion swirling air (secondary air) supply port 18 are provided. It is also possible to supply coal, primary air and secondary air tangentially from one supply port. Further, the slag outlet 7 can also be provided in a small diameter portion. 5 is a gas communication port, and 10 is a combustion chamber.

The pre-combustion chamber 1 is located below the connection between the pre-combustion chamber 16 and the cyclone body 15 in the gas communication port 5.
A baffle 20 is provided for guiding the swirling gas from the cyclone body 15 to the small diameter portion of the cyclone body 15, inverting it, and guiding it to the gas communication port 5.

In the cyclone coal combustion apparatus configured as described above, pulverized coal, primary air and swirling secondary air are supplied to the pre-combustion chamber 16, and the pulverized powder is absorbed from the heat from the wall surface of the pre-combustion chamber, the flame and the cyclone body. The cyclone body 15 is ignited and pre-combusted to produce high-temperature combustion gas, which is guided tangentially from the downstream end of the cyclone body 15 to continue combustion and generate a reverse swirling flow.

Along with the high-temperature combustion gas, the unburned portion of the coal and a portion of the ash are introduced into the cyclone body 15 and flow into the narrow space of the small diameter section, so they are accelerated by stronger centrifugal force and combustion is promoted. At the same time, slag is efficiently collected. Furthermore, the combustion gas
Since the baffle 20 reverses and reciprocates within the cyclone body 15, the residence time of the coal particles becomes longer, the coal particles are efficiently reburned, the ash removal rate is improved, and the amount of unburned particles is reduced.

[Effect of idea]

As described above, the cyclone coal combustion device of the present invention is configured to generate high-temperature combustion gas in advance in the pre-combustion chamber, and then supply this combustion gas tangentially from the downstream end of the cyclone body for continuous combustion. This improves combustion efficiency, and since the cyclone body is approximately conical, the number of turns of the combustion gas increases, increasing the swirling force. Since the slag is reciprocated, the residence time becomes longer, and this has the effect that a high slag removal rate and high combustion efficiency can be achieved without providing a secondary slag collection means. In addition, since the entire amount of coal required for combustion is charged into the pre-combustion chamber, there is no need to divide the coal into the pre-combustion chamber, thereby simplifying the apparatus.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view showing one embodiment of the cyclone coal combustion device of the present invention, Fig. 2 is an explanatory cross-sectional view taken along the line - in Fig. 1, and Fig. 3 is a cross-sectional view showing an example of the conventional cyclone coal combustion device. It is an explanatory diagram. 1... Furnace, 2... Cyclone coal combustion device,
3...Coal input port, 4...Air supply port, 5...Gas communication port, 6...Slag buttful, 7...Slag outlet, 8...Slag tank, 10...Combustion chamber,
11... Bypass line, 12... Flame, 15...
...Cyclone body, 16... Pre-combustion chamber, 17...
Coal/primary air supply port, 18... Combustion swirling air supply port, 20... Batsuful.

Claims (1)

[Scope of utility model registration request] The large diameter portion of the approximately conical cyclone body 15 is attached to the side wall of the furnace 1 laterally through the gas inlet 5, and a vertical swirling downward flow type pre-arrangement is tangentially attached to the upper surface of the large diameter portion of the cyclone body 15. Connect the combustion chamber 16,
A slag flow outlet 7 is provided on the lower surface of the cyclone main body 15, and a coal input port for supplying the entire amount of coal necessary for combustion and a swirling air supply port 18 for combustion are provided in the upper part of the pre-combustion chamber 16. Inside the opening 5, a groove is provided below the connection between the pre-combustion chamber 16 and the cyclone body 15 in order to guide the swirling gas from the pre-combustion chamber 16 to the small diameter part of the cyclone body 15, reverse it, and guide it to the gas communication port 5. A cyclone coal combustion device characterized by being provided with a full 20.