Shared deslagging system of sintering flue gas deep purification device

Abstract

The utility model discloses a shared deslagging system of a sintering flue gas deep purification device, and solves the problem of how to improve a deslagging system of a traditional circulating fluidized bed boiler. Comprising an in-furnace air distribution plate (1), a left coarse slag discharging pipe (2) and a left medium-fine slag discharging pipe (3) are arranged on the in-furnace air distribution plate (1), a left coarse slag cold slag discharging device (7) is connected to the lower end of the left coarse slag discharging pipe (2), a left medium-fine slag cold slag discharging device (8) is connected to the lower end of the left medium-fine slag discharging pipe (3), and slag (6) is arranged on the in-furnace air distribution plate (1). Coarse slag in the slag is arranged at an upper port of the left side coarse slag discharging pipe (2), fine slag in the slag is arranged at an upper port of the left middle fine slag discharging pipe (3), a left slag discharging communicating pipe (11) is connected between the left side coarse slag discharging pipe and the left middle fine slag discharging pipe (3), and a left slag discharging communicating valve (12) is arranged on the left slag discharging communicating pipe.

Description

Technical Field

[0001] The utility model relates to a sintering fume multi-pollutant collaborative purification device for purifying sintering fume, in particular to a shared slag discharge system of a sintering fume deep purification device. Background Art

[0002] Existing circulating fluidized bed boilers are generally divided into two types: steam boilers and hot water boilers. The fuel of circulating fluidized bed boilers is coal or other fuels with calorific value. The combustion air in the boiler is generally air, and the oxygen content in the air is about 21%. The flue gas generated in the furnace is discharged through the furnace, separator and tail flue in turn. The medium of the boiler is heat-exchanged with the high-temperature flue gas in the boiler through the economizer, water cooling system and superheater to form high-quality steam or hot water; in the iron smelting plant, the iron ore is first crushed into iron ore powder, mixed evenly with coke, limestone powder, etc., and then fired in a sintering machine for hot agglomeration and then used for subsequent iron smelting. In this process, the sintering machine will generate a large amount of sintering flue gas, which contains CO, SO2, NO x Toxic and harmful gases such as HCl and dioxins. The traditional process for treating these harmful gases is to add environmental protection equipment, which has the disadvantages of large equipment investment, high use and maintenance costs, and limited elimination of harmful gases. In view of the above situation, the prior art has adopted a technology for treating sintering flue gas with a circulating fluidized bed boiler. This special circulating fluidized bed boiler is also called a sintering flue gas multi-pollutant coordinated purification device. The main principle of the sintering flue gas multi-pollutant coordinated purification device is to replace the air with the sintering flue gas generated in the sintering machine as the combustion-supporting air of the circulating fluidized bed boiler, and through the high temperature environment in the furnace of the circulating fluidized bed boiler and the unique environmental protection advantages of the circulating fluidized bed boiler, the harmful gases in the sintering flue gas are burned and removed, and the steam or hot water generated by the circulating fluidized bed boiler is supplied to other processes in the iron and steel plant, achieving the effect of killing two birds with one stone.

[0003] The deep purification device for sintering flue gas in steel plants is developed based on the treatment of sintering flue gas and other waste gases. It follows the structure of the traditional circulating fluidized bed boiler. The traditional circulating fluidized bed boiler controls the boiler air chamber pressure through the slag discharge system to achieve normal combustion in the furnace. The slag discharge system of the circulating fluidized bed boiler is composed of a coarse slag discharge system and a fine slag discharge system, and the two systems are independently set up; when the boiler is running at high load, the fine slag discharge system is closed to ensure that the fine ash in the furnace circulates between the furnace and the cyclone separator to stabilize the high load of the boiler; when the boiler is running at low load, the fine slag discharge system is started to discharge part of the fine slag out of the furnace; the deep purification device for sintering flue gas uses sintering flue gas instead of air for combustion. Because the oxygen content of the flue gas is low and the dust content in the flue gas is large, the coarse slag generated in the furnace is greatly increased. How to improve the slag discharge system of the traditional circulating fluidized bed boiler to meet the slag discharge requirements of the coarse slag in the furnace is a problem that needs to be solved urgently on site. Summary of the invention

[0004] The utility model provides a common slag discharge system of a sintering flue gas deep purification device, which solves the technical problem of how to improve the slag discharge system of a traditional circulating fluidized bed boiler to meet the slag discharge requirement of coarse slag in the furnace.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A common slag discharge system for a sintering flue gas deep purification device comprises an air distribution plate in a furnace, on which a left coarse slag discharge pipe and a left medium-fine slag discharge pipe are respectively arranged, the lower end of the left coarse slag discharge pipe is connected with a left coarse slag cooler, the lower end of the left medium-fine slag discharge pipe is connected with a left medium-fine slag cooler, slag is arranged on the air distribution plate in the furnace, the coarse slag in the slag is arranged at the upper port of the left coarse slag discharge pipe, the fine slag in the slag is arranged at the upper port of the left medium-fine slag discharge pipe, a left slag discharge connecting pipe is connected between the left coarse slag discharge pipe and the left medium-fine slag discharge pipe, and a left slag discharge connecting pipe is arranged with a left slag discharge connecting valve.

[0007] A right coarse slag discharge pipe and a right medium-fine slag discharge pipe are respectively arranged on the air distribution plate in the furnace, a right coarse slag cooling slag discharger is connected to the lower end of the right coarse slag discharge pipe, a right medium-fine slag cooling slag discharger is connected to the lower end of the right medium-fine slag discharge pipe, a right slag discharge connecting pipe is connected between the right coarse slag discharge pipe and the right medium-fine slag discharge pipe, and a right slag discharge connecting pipe is arranged with a right slag discharge connecting valve; an accident slag discharge pipe is arranged in the middle of the air distribution plate in the furnace.

[0008] The utility model adds an inclined pipe at the inlet of the coarse slag cooler to connect with the inlet of the fine slag cooler, and sets a high-temperature ash valve at a suitable position of the inclined pipe to control the flow of slag. The slag discharge requirements under various working conditions of the sintering flue gas deep purification device are met, and there is no special requirement for the installation space of the on-site slag cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0010] The utility model is described in detail below with reference to the accompanying drawings:

[0011] A common slag discharge system of a sintering flue gas deep purification device comprises an in-furnace air distribution plate 1, on which a left coarse slag discharge pipe 2 and a left medium-fine slag discharge pipe 3 are respectively arranged, a left coarse slag discharge valve 9 is arranged on the left coarse slag discharge pipe 2, a left medium-fine slag discharge valve 10 is arranged on the left medium-fine slag discharge pipe 3, a left coarse slag cooler 7 is connected to the lower end of the left coarse slag discharge pipe 2, a left medium-fine slag cooler 8 is connected to the lower end of the left medium-fine slag discharge pipe 3, slag 6 is arranged on the in-furnace air distribution plate 1, the coarse slag in the slag 6 is arranged at the upper end of the left coarse slag discharge pipe 2, the fine slag in the slag 6 is arranged at the upper end of the left medium-fine slag discharge pipe 3, a left slag discharge connecting pipe 11 is connected between the left coarse slag discharge pipe 2 and the left medium-fine slag discharge pipe 3, and a left slag discharge connecting valve 12 is arranged on the left slag discharge connecting pipe 11.

[0012] A right coarse slag discharge pipe 5 and a right medium-fine slag discharge pipe 4 are respectively arranged on the air distribution plate 1 in the furnace, a right coarse slag discharge valve 15 is arranged on the right coarse slag discharge pipe 5, a right medium-fine slag discharge valve 16 is arranged on the right medium-fine slag discharge pipe 4, a right coarse slag cooler 13 is connected to the lower end of the right coarse slag discharge pipe 5, a right medium-fine slag cooler 14 is connected to the lower end of the right medium-fine slag discharge pipe 4, a right slag discharge connecting pipe 17 is connected between the right coarse slag discharge pipe 5 and the right medium-fine slag discharge pipe 4, and a right slag discharge connecting valve 18 is arranged on the right slag discharge connecting pipe 17; an accident slag discharge pipe 19 is arranged in the middle of the air distribution plate 1 in the furnace; the existing sintering flue gas deep purification The device is generally equipped with two coarse slag discharge systems and two fine slag discharge systems. The two coarse slag discharge systems are independent of each other and are arranged on both sides of the furnace air distribution plate to discharge the coarse slag in the furnace; the two fine slag discharge systems are arranged in the middle of the furnace air distribution plate and are also independently arranged; the two fine slag discharge systems work when the equipment is debugged or operated at low load, and are basically idle when the equipment is operated at rated load; the utility model connects the coarse slag and fine slag pipes to allow the two idle fine slag cold slag dischargers under rated load to participate in the coarse slag discharge, thereby solving the bottleneck problem of insufficient slag discharge capacity of the sintering machine flue gas deep purification and the residual heat recovery and utilization device.

Claims

1. A common slag discharge system for a sintering flue gas deep purification device, comprising an in-furnace air distribution plate (1), on which a left coarse slag discharge pipe (2) and a left medium-fine slag discharge pipe (3) are respectively arranged, a left coarse slag cooler (7) is connected to the lower end of the left coarse slag discharge pipe (2), and a left medium-fine slag cooler (8) is connected to the lower end of the left medium-fine slag discharge pipe (3), slag (6) is arranged on the in-furnace air distribution plate (1), coarse slag in the slag (6) is arranged at the upper end of the left coarse slag discharge pipe (2), and fine slag in the slag (6) is arranged at the upper end of the left medium-fine slag discharge pipe (3), and the characteristic is that: A left slag discharge connecting pipe (11) is connected between the left coarse slag discharge pipe (2) and the left medium and fine slag discharge pipe (3), and a left slag discharge connecting pipe (11) is provided with a left slag discharge connecting valve (12).

2. The common slag discharge system of the sintering flue gas deep purification device according to claim 1 is characterized in that: A right coarse slag discharge pipe (5) and a right medium-fine slag discharge pipe (4) are respectively arranged on the air distribution plate (1) in the furnace; a right coarse slag cooling slag discharger (13) is connected to the lower end of the right coarse slag discharge pipe (5); a right medium-fine slag cooling slag discharger (14) is connected to the lower end of the right medium-fine slag discharge pipe (4); a right slag discharge connecting pipe (17) is connected between the right coarse slag discharge pipe (5) and the right medium-fine slag discharge pipe (4); a right slag discharge connecting pipe (17) is arranged with a right slag discharge connecting valve (18); and an emergency slag discharge pipe (19) is arranged in the middle of the air distribution plate (1) in the furnace.

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