CN209782585U

CN209782585U - Smoke exhaust temperature regulating device of solid waste horizontal waste heat boiler

Info

Publication number: CN209782585U
Application number: CN201920353203.7U
Authority: CN
Inventors: 李翠平
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2019-12-13
Anticipated expiration: 2029-03-20

Abstract

The utility model provides a gu horizontal waste heat boiler exhaust gas temperature regulation and control device of useless rubbish belongs to temperature regulation and control device technical field. The utility model discloses the exit at horizontal exhaust-heat boiler's exhaust-heat boiler entry flue is provided with flue gas flow control valve, exhaust-heat boiler entry flue is linked together with flue gas channel, I level convection bank sets gradually in flue gas channel with II level convection bank, one side of ash bucket partition wall is linked together through flue gas flow control valve and exhaust-heat boiler entry flue, the opposite side and the flue gas channel of ash bucket partition wall are linked together under I level convection bank in position, install the flue on the ash bucket partition wall, install the governing valve on the flue. The utility model discloses a set up flue gas flow control valve on exhaust-heat boiler, make exhaust-heat boiler part receive the hot side by the short circuit, the exhaust gas temperature of close control exhaust-heat boiler is at 500-550 ℃ within range, restraines the secondary of dioxin and produces.

Description

Smoke exhaust temperature regulating device of solid waste horizontal waste heat boiler

Technical Field

The utility model relates to a gu horizontal waste heat boiler exhaust gas temperature regulation and control device of useless rubbish belongs to temperature regulation and control device technical field.

Background

The urbanization process of China is inevitable, and one of the negative effects is the sharp increase of municipal solid waste. Therefore, the work significance of the harmless treatment of the household garbage is great. The incineration technology can realize reduction, and is one of the most effective and economical garbage treatment technologies at present. The waste incineration power generation not only can effectively solve the problems of volume reduction and harmlessness of municipal domestic waste, but also can fully utilize heat energy generated by incineration to realize the aim of waste recycling, belongs to the industry encouraging development in China, and becomes an important development direction for waste treatment in China. However, if the incineration process is not proper, the discharged flue gas contains a large amount of toxic dioxin-like substances. At present, dioxin discharged from household garbage incineration plants accounts for a considerable proportion of the total amount of dioxin discharged, and it is very important to strictly control the generation of dioxin in garbage incineration. How to effectively prevent and control secondary pollution enables a waste incineration power generation project to better exert environmental benefits, furthest lightens the influence on the environment, and also increasingly draws attention of people.

The mechanism for generating dioxin in the incineration process of the household garbage is quite complex, the household garbage contains a trace amount of dioxin, and due to the thermal stability of the dioxin, although most of the dioxin is decomposed during high-temperature combustion, a part of the dioxin is still discharged after the burning. When the combustion is insufficient and the flue gas contains excessive unburnt substances, the decomposed dioxin can be regenerated in the environment of 300-500 ℃ of the tail flue gas temperature of the waste heat boiler. Therefore, in order to reduce the emission of dioxin, besides controlling the combustion process to completely decompose the dioxin, another important measure is to avoid the exhaust gas temperature of the waste heat boiler to be lower than 500 ℃ and prevent the dioxin from being synthesized again in a low-temperature area.

At present, the mainstream technology of the waste incineration project adopts a combustion furnace as an incineration main body, high-temperature flue gas generated after incineration enters a secondary combustion chamber, and in order to ensure the full decomposition of dioxin, the design of a boiler requires that the proper flue gas flow rate and temperature are controlled so as to ensure that the flue gas temperature at the outlet of the secondary combustion chamber is more than or equal to 1100 ℃, and the dioxin is fully decomposed. The heat exchange waste heat boiler is designed according to a common heat exchange mode, a first channel and a second channel through which flue gas passes adopt a water cooling structure, a side wall from a third channel to the tail end of a convection tube bundle adopts a wall-wrapped water cooling wall structure, the flue gas passes through the region and is discharged out of the boiler, and the exhaust gas temperature is about 500-550 ℃; if no effective measure is taken to quench the flue gas temperature from 500 ℃ to 300 ℃, dioxin can be generated again. According to research and sampling analysis, the current domestic waste incinerator flue gas dioxin emission concentration in China meets the national standard emission rate of only 60%, and the emission control of domestic waste incinerator dioxin still needs to be enhanced. According to the generation mechanism of dioxin in the solid waste incineration technology, quenching is not feasible in a low-temperature area of flue gas of a waste heat boiler at present, and in order to avoid the regeneration of the dioxin caused by the fact that the temperature of the exhaust gas of the waste heat boiler is lower than 500 ℃, the flue gas temperature regulating and controlling device technology can be arranged in a horizontal waste heat boiler.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems existing in the prior art and further providing a solid waste garbage horizontal waste heat boiler exhaust gas temperature regulating device.

The utility model aims at realizing through the following technical scheme:

The utility model provides a solid useless rubbish horizontal exhaust-heat boiler smoke temperature regulation and control device, includes: the waste heat boiler comprises a waste heat boiler inlet flue, a flue gas flow regulating valve, a I-stage convection tube bundle, a II-stage convection tube bundle, an ash falling bucket partition wall, a flue, a regulating valve and a flue gas channel;

Wherein, the exit of horizontal exhaust-heat boiler's exhaust-heat boiler entry flue is provided with flue gas flow control valve, and exhaust-heat boiler entry flue is linked together with flue gas channel, II grades of convection bank and I grades of convection bank set gradually in flue gas channel, one side of ash bucket partition wall is linked together through flue gas flow control valve and exhaust-heat boiler entry flue, the opposite side and the flue gas channel of ash bucket partition wall are linked together under I grades of convection bank in the position, install the flue on the ash bucket partition wall, install the governing valve on the flue.

And part of the flue gas can enter a flue arranged on a partition wall of the ash falling hopper through a flue gas flow regulating valve and directly exchanges heat with the I-level convection bank through the regulating valve.

The opening degree of the flue gas flow regulating valve and the opening degree of the regulating valve are regulated according to the exhaust gas temperature of the waste heat boiler.

The utility model has the advantages that:

the utility model discloses an adopt exhaust gas temperature regulation and control device technique at ministerial exhaust-heat boiler, the horizontal exhaust-heat boiler exhaust gas temperature of strict control is at 500-550 ℃. The smoke temperature is prevented from being lower than 500 ℃, the secondary generation of dioxin is inhibited, and the concentration of the dioxin in the smoke discharged into the atmosphere reaches the emission standard of 0.1ngTEQ/m³And the temperature of the exhaust gas is reduced as much as possible, so that the reduction and harmless treatment of the garbage are carried out, the health of people is not damaged, and the exhaust gas temperature regulating and controlling device has the advantages of practicability and higher efficiency.

The utility model discloses well flue gas flow control valve's aperture size is adjusted according to exhaust gas temperature of exhaust-heat boiler, makes partial flue gas get into the flue on the ash bucket partition wall through flue gas flow control valve, and the flue gas directly carries out the heat exchange with I level convection bank through the governing valve, and does not pass through II levels convection bank, receives the hot side by the short circuit through making exhaust-heat boiler part to improve exhaust-heat boiler exhaust gas temperature, can effectually prevent the regeneration of dioxin.

Drawings

fig. 1 is the utility model discloses a structure schematic diagram of a solid useless rubbish horizontal waste heat boiler exhaust gas temperature regulation and control device.

The reference numeral in the figure, 1 is exhaust-heat boiler entry flue, 2 is flue gas flow control valve, and 3 are I level convection bank, and 4 are II level convection bank, and 5 are ash bucket partition wall, 6 are the flue, and 7 are the governing valve, and 8 are flue gas channel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1, the exhaust gas temperature control device of the solid waste horizontal waste heat boiler according to the present embodiment includes: the system comprises a waste heat boiler inlet flue 1, a flue gas flow regulating valve 2, a I-stage convection bank 3, a II-stage convection bank 4, a ash falling bucket partition wall 5, a flue 6, a regulating valve 7 and a flue gas channel 8;

Wherein, the exit of horizontal exhaust-heat boiler's exhaust-heat boiler entry flue 1 is provided with flue gas flow control valve 2, and exhaust-heat boiler entry flue 1 is linked together with flue gas channel 8, II level convection bank 4 sets gradually in flue gas channel 8 with I level convection bank 3, one side of ash falling bucket partition wall 5 is linked together with exhaust-heat boiler entry flue 1 through flue gas flow control valve 2, the opposite side and the flue gas channel 8 of ash falling bucket partition wall 5 are linked together under I level convection bank 3 position, install flue 6 on the ash falling bucket partition wall 5, install governing valve 7 on the flue 6.

And part of the flue gas can enter a flue 6 arranged on a partition wall 5 of the ash falling hopper through a flue gas flow regulating valve 2 and directly exchanges heat with the I-level convection bank 3 through a regulating valve 7.

The opening degree of the flue gas flow regulating valve 2 and the opening degree of the regulating valve 7 are regulated according to the exhaust gas temperature of the waste heat boiler.

example 1

as shown in figure 1, the fume exhaust temperature regulating device of the solid waste horizontal waste heat boiler is applied to the horizontal waste heat boiler, a flue gas flow regulating valve 2 is arranged at the outlet of an inlet flue 1 of the waste heat boiler of the horizontal waste heat boiler, the inlet flue 1 of the waste heat boiler is communicated with a flue gas channel 8, the II-grade convection bank 4 and the I-grade convection bank 3 are arranged in a flue gas channel 8, an ash falling hopper partition wall 5 is arranged below the flue gas channel 8, one side of the ash falling hopper partition wall 5 is communicated with an inlet flue 1 of the waste heat boiler through a flue gas flow regulating valve 2, the other side of the ash falling hopper partition wall 5 is communicated with the flue gas channel 8 at a position right below the I-grade convection bank 3, a flue 6 is arranged on the ash falling hopper partition wall 5, an adjusting valve 7 is installed on the flue 6, and an electric adjusting linkage system can be adopted for adjusting the flue gas flow adjusting valve 2 and the adjusting valve 7, so that the opening degree can be automatically adjusted according to the exhaust gas temperature of the waste heat boiler. The heating areas of the waste heat boiler are large in design, and the exhaust gas temperature of the waste heat boiler is not higher than 550 ℃ under normal conditions, so that the process requirements are met; when the exhaust gas temperature of the waste heat boiler is lower than 500 ℃, as shown in fig. 1, arrows in the figure indicate the flow direction of the exhaust gas, a gas flow regulating valve 2 and a regulating valve 7 are opened, so that part of the exhaust gas enters a flue 6 on an ash falling hopper partition wall 5 through the ash falling hopper partition wall 5, the exhaust gas directly exchanges heat with a I-level convection bank 3 through the regulating valve 7, the part of the exhaust gas does not pass through a II-level convection bank 4, part of the heated area is short-circuited, and the exhaust gas temperature of the waste heat boiler is improved. The exhaust temperature of the waste heat boiler is controlled within the range of 500-550 ℃ by adjusting the opening of the flue gas flow regulating valve 5 and the opening of the regulating valve 7, so that dioxin is prevented from being synthesized again in a low-temperature area.

The above description is only the preferred embodiments of the present invention, and these embodiments are all based on the present invention, and the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a solid useless rubbish horizontal exhaust-heat boiler smoke temperature regulation and control device which characterized in that includes: the waste heat boiler comprises a waste heat boiler inlet flue (1), a flue gas flow regulating valve (2), a I-stage convection bank (3), a II-stage convection bank (4), a ash falling bucket partition wall (5), a flue (6), a regulating valve (7) and a flue gas channel (8);

Wherein, the exit of horizontal exhaust-heat boiler's entry flue (1) is provided with flue gas flow control valve (2), and exhaust-heat boiler entry flue (1) is linked together with flue gas channel (8), II grades of convection bank (4) set gradually in flue gas channel (8) with I grade convection bank (3), one side of ash falling bucket partition wall (5) is linked together through flue gas flow control valve (2) and exhaust-heat boiler entry flue (1), the opposite side and flue gas channel (8) of ash falling bucket partition wall (5) are linked together under I grade convection bank (3), install flue (6) on ash falling bucket partition wall (5), install governing valve (7) on flue (6).

2. The device for regulating and controlling the exhaust gas temperature of the solid waste horizontal waste heat boiler according to claim 1, wherein part of the exhaust gas passing through the exhaust gas flow regulating valve (2) enters a flue (6) arranged on a dust hopper partition wall (5) and directly exchanges heat with the I-stage convection bank (3) through a regulating valve (7).

3. The device for regulating and controlling the smoke exhaust temperature of the solid waste horizontal waste heat boiler according to claim 1, wherein the opening degree of the smoke flow regulating valve (2) and the opening degree of the regulating valve (7) are regulated according to the smoke exhaust temperature of the waste heat boiler.