RU29965U1 - Device for removing flue gases from the furnace of a boiler unit - Google Patents

Description

The closest analogue of the proposed device for the combination of essential features is a well-known known device for removing flue gases from the furnace of a boiler unit adopted as a prototype, comprising a casing with a vertically arranged cylindrical internal cavity having an outlet in the upper end, a chimney communicating with an outlet in the inner cavity of the casing , a gas supply pipe communicating the furnace with the internal cavity of the body and directed tangentially to the latter, the air supply tubes connected to the lower part of the casing and an air outlet pipe with an inlet connected to the upper part of the casing and communicating with its outlet with the firebox (see USSR author's certificate No. 1466415, F23 L 15/04, application no. 21.07.1987, BI No. 20, 1988).

In the prototype device, there is no flue gas recirculation and direct interaction of the latter with the air entering the housing through the air inlet pipe, which eliminates the possibility of cleaning flue gases from harmful nitrogen compounds, reduces the degree of air heating and eliminates the possibility of secondary combustion of the fuel components contained in the flue gas. The noted shortcomings lead to a deterioration of the environmental situation in the area of the boiler installation, to a decrease in the efficiency (COP) of the operation of the boiler unit and to an increase

consumption of fuel burned in it. In addition, in this device, the draft of the chimney is reduced as a result of the large friction of the flue gases against its inner walls, which causes an increase in the height of the chimney. In turn, increasing the height of the chimney increases the cost of the boiler installation and creates obstacles to its use in conditions where there is a restriction on the height of the chimney.

The technical problem for which the proposed device serves is to provide the possibility of recirculation of flue gases with their direct interaction with the air supplied to the furnace of the boiler unit, and the creation of a mode of movement of flue gases with reduced friction of the latter on the inner walls of the chimney.

The technical result obtained by the practical use of the proposed device is to reduce the content of harmful nitrogen oxides in the gases discharged through the chimney, increase the degree of heating of the air entering the furnace, and reduce fuel consumption during the operation of the boiler unit by providing the possibility of recirculation of flue gases with their direct interaction with the incoming air into the furnace, as well as an increase in the draft of the chimney due to the creation of a regime of movement of flue gases with reduced friction of the latter morning wall of the chimney. Marked technical result, ultimately allows

to increase the environmental safety and efficiency of the boiler plant, which includes the proposed device.

To solve the technical problem in the proposed device for the removal of flue gases from the furnace of the boiler unit, comprising a housing with a vertically arranged cylindrical internal cavity having an outlet in the upper end, a chimney communicating with an outlet in the inner cavity of the housing, a gas supply pipe communicating the furnace with the internal cavity of the housing and directed tangentially to the latter, the air supply pipe connected to the lower part of the body, and the air discharge pipe ok with an inlet connected to the upper part of the housing and communicating with the furnace outlet, the gas supply pipe communicates with the internal cavity of the housing at its lower part, the output section of the air supply pipe is located in the lower part of the internal cavity of the housing coaxially to the latter with the formation of an annular channel between the specified section the nozzle and the housing, and the exhaust pipe with its inlet communicates with the upper part of the internal cavity of the housing, while the inlet is the air outlet The box is located below the chimney and above the outlet section of the air inlet.

The essence of the utility model is illustrated by drawings, which depict:

in FIG. 1 is a longitudinal section of a device;

FIG. 2 - section AA in FIG. 1.

A device for removing flue gases from the furnace of a boiler unit contains a housing 1 with a vertically arranged cylindrical internal cavity 2 having an outlet 3 in the upper end, a gas supply pipe 4, which communicates the furnace of the boiler unit with the lower part of the cavity 2 and directed tangentially to the latter, the chimney 5, communicating with the output end hole 3 of the cavity 2, the air supply pipe 6, the output section 7 of which is located in the lower part of the cavity 2 coaxially to the latter with the formation of an annular anal 8 between this section of the pipe 6 and the housing 1, and the exhaust pipe 9 with an inlet 10, communicating the upper part of the cavity 2 with the furnace of the boiler unit. In this case, the inlet 10 of the pipe 9 is located below the chimney 5 and above the output section 7 of the pipe 6, and the cross section of the pipes 4 and 9 may have a round, rectangular, ellipse or other shape.

The device operates as follows.

upward along the annular channel 8 and cavity 2. In this case, due to the tangentially directed supply, the flue gases move along the channel 8 and cavity 2 in the form of a vortex (swirling in a spiral) flow, in the central zone of which a vacuum is created, which ensures ejection of the air from the nozzle 6 into the cavity 2. Since the ejected air is colder and, accordingly, heavier than flue gases, it moves to the inner walls of the housing 1 due to the centrifugal forces created by the vortex flue gas flow. The indicated movement of the air stream is accompanied by its interaction with the vortex flue gas stream, during which the ejected air is heated and humidified. In addition to air, heavy (including harmful) components of flue gases are carried to the periphery of the vortex flow due to the action of centrifugal forces, which, together with humidified air, are removed from the upper part of the cavity 2 through the pipe 9 to the furnace of the boiler unit. Thus, the flue gases are recirculated with their direct interaction in the vortex flow with the ejected air, which helps to reduce the concentration of harmful nitrogen oxides in the flue gases leaving the cavity 2 through the chimney 5 into the atmosphere. In this case, the vortex movement of the flue gases continues in the pipe 5, which reduces their friction against the inner walls of the latter, thereby increasing the chimney draft. 6

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Practical use of the proposed device can improve the environmental safety of boiler plants by reducing the content of harmful substances in the flue gas entering the atmosphere generated during fuel combustion. However, the use of the proposed device can improve the efficiency (efficiency) of the operation of the boiler unit due to the secondary combustion of the fuel components contained in the flue gas, and by increasing the degree of heating of the air entering the furnace of the boiler unit. In addition, the increase in draft in the chimney of the proposed device allows to reduce its height and thereby reduce the total cost of the boiler installation and expand its scope.

Author: x j X -----..., I.A. Ivanov

Claims (1)

A device for removing flue gases from the furnace of a boiler unit, comprising a housing with a vertically arranged cylindrical internal cavity having an outlet in the upper end, a chimney communicating with an outlet in the interior of the housing, a gas supply pipe communicating the furnace with the interior of the housing and directed tangentially to the latter, an air inlet connected to the lower part of the housing, and an air outlet with an inlet connected to the upper part of the housing a whisker and communicating with its exit to the furnace, characterized in that the gas supply pipe communicates with the internal cavity of the housing in its lower part, the output section of the air supply pipe is located in the lower part of the internal cavity of the housing coaxially to the latter with the formation of an annular channel between the specified section of the pipe and the housing, and the exhaust pipe with its inlet communicates with the upper part of the inner cavity of the housing, while the inlet of the exhaust pipe is located below the fumes nd tube and above the output portion of the air supply pipe.