Automatic drainage mechanism for sintering flue gas purification device boiler screen inlet header

Abstract

The utility model discloses a kind of automatic drainage mechanism of sintering flue gas purification device boiler screen inlet header box, solve the problem that drain not in time in the inlet header box of reheating screen;Drainage collection vertical cylinder (4) is communicated on the lower end flat end cap (3) of header box, water outlet nozzle (5) is set in the lower end of drainage collection vertical cylinder (4), drainage discharge vertical pipe (6) is connected on water outlet nozzle (5), electric control stop valve (7) is set on drainage discharge vertical pipe (6), drain level alarm sensor (8) and limit level sensor (9) are respectively set in drainage collection vertical cylinder (4);Electric control stop valve (7), drain level alarm sensor (8) and limit level sensor (9) are electrically connected together;The utility model realizes the automatic and timely discharge of drain in inlet header box, can effectively avoid the formation of water plug phenomenon;Simple structure, reliable operation.

Description

Technical Field

[0001] This utility model relates to a boiler for sintering flue gas purification, and more particularly to an automatic drainage mechanism for the inlet header of the middle screen of the boiler for sintering flue gas purification. Background Technology

[0002] In some steel plants, sintering production lines generate large amounts of sintering flue gas. This flue gas requires purification to ensure ultra-low emissions of pollutants. A deep purification boiler for sintering flue gas feeds the flue gas into the furnace, where combustion and internal environmental protection facilities treat and purify pollutants such as NOx, SO2, CO, and dioxins at low cost. Simultaneously, heat is released during this process, heating water to high-quality superheated steam. This superheated steam is then transported to steam-using production lines or used for direct power generation. In this way, the deep purification system for sintering flue gas can both treat pollutants in the flue gas at low cost and maximize the utilization of its calorific value, achieving a synergistic treatment and utilization of the sintering flue gas. The screen in the deep purification boiler is a device used to increase steam temperature, typically located on the flue gas side of the boiler. In this system, the screen's function is to recover waste heat from the flue gas to improve steam quality. The heat exchange system is typically divided into superheated and reheated heat exchangers. The heat exchanger structure usually consists of tube banks, protective plates, supporting structures, and inlet headers. The tube banks are the main heat exchange elements of the heat exchanger, usually employing high-efficiency heat transfer surfaces such as finned tubes or smooth tubes to enhance heat exchange. The inlet header connects the heat exchangers to facilitate steam flow. During boiler operation, cooling water is sometimes injected into the heat exchanger to reduce steam temperature, and some condensate is also generated during steam operation. To drain the condensate, a manual valve is installed at the lower end of the inlet header. When there is a large amount of condensate, the operator opens the manual valve to drain the condensate from the inlet header. However, in actual operation, due to human error, condensate drainage is often delayed, causing the condensate at the lower end of the inlet header to rise into the steam tube banks of the heat exchanger, leading to water blockage and creating a safety hazard for the sintering flue gas purification device. Summary of the Invention

[0003] This utility model provides an automatic drainage mechanism for the condensate drain on the inlet header of a boiler panel in a sintering flue gas purification device, which solves the technical problem of untimely drainage of condensate from the inlet header of the panel.

[0004] This utility model solves the above technical problems through the following technical solution: An automatic drainage mechanism for the condensate drain on the boiler inlet header of a sintering flue gas purification device includes a vertically arranged inlet header and an electrical controller. A heating surface tube bank is connected to the inlet header. A flat end cover is located at the lower end of the inlet header, and a condensate collection cylinder is connected to the flat end cover. A water outlet is located at the lower end of the condensate collection cylinder, and a condensate discharge riser is connected to the water outlet. An electrically controlled shut-off valve is installed on the condensate discharge riser. A condensate level alarm sensor and a limit level sensor are respectively installed inside the condensate collection cylinder. The electrically controlled shut-off valve, the condensate level alarm sensor, and the limit level sensor are all electrically connected to the electrical controller.

[0005] A maintenance manual valve is installed on the condensate collection riser; a spare manual shut-off valve is installed on the condensate discharge riser.

[0006] This invention enables the automatic and timely discharge of condensate from the inlet header of the screen, effectively preventing water blockage; it has a simple structure and reliable operation. Attached Figure Description

[0007] Figure 1 is a structural schematic diagram of this utility model. Detailed Implementation

[0008] The present invention will now be described in detail with reference to the accompanying drawings: An automatic condensate drainage mechanism for the inlet header of a boiler panel in a sintering flue gas purification device includes a vertically arranged superheater panel, a reheater panel inlet header 1, and an electrical controller. A heating surface tube bank 2 is connected to the heating surface inlet header 1, through which steam flows. When cooling the high-temperature steam in the heating surface, cooling water is sprayed into the panel, and this cooling water collects in the inlet header 1, forming condensate in the inlet header. A lower end flat cover 3 is provided at the lower end of the inlet header 1, and a condensate collection vertical cylinder 4 is connected to the lower end flat cover 3. A water outlet 5 is provided at the lower end of the condensate collection vertical cylinder 4, and a condensate discharge vertical pipe 6 is connected to the water outlet 5. An electrically controlled shut-off valve 7 is provided on the condensate discharge vertical pipe 6. The collection cylinder 4 is equipped with a condensate level alarm sensor 8 and a limit level sensor 9. The electrically controlled shut-off valve 7, the condensate level alarm sensor 8, and the limit level sensor 9 are electrically connected to the electric controller. When the condensate accumulation in the condensate collection cylinder 4 reaches the installation position of the condensate level alarm sensor 8, the condensate level alarm sensor 8 transmits an alarm signal to the electric controller, which then issues an alarm signal to alert the on-site operator that the condensate accumulation has reached the alarm position. When the condensate accumulation in the condensate collection cylinder 4 reaches the installation position of the limit level sensor 9, the limit level sensor 9 sends a signal to the electric controller, which then controls the electrically controlled shut-off valve 7 to open, automatically discharging the condensate accumulated in the inlet header 1 through the condensate discharge riser 6.

[0009] A manual maintenance valve 10 is installed on the condensate collection riser 4 for use when repairing the equipment; a spare manual shut-off valve 11 is installed on the condensate discharge riser 6 for use when replacing the electrically controlled shut-off valve 7.

Claims

1. An automatic drainage mechanism for the inlet header of a boiler screen in a sintering flue gas purification device, comprising a vertically arranged inlet header (1) and an electrical controller, wherein a heat-receiving surface tube bank (2) is connected to the inlet header (1), and a flat end cap (3) is provided at the lower end of the inlet header (1), characterized in that, A condensate collection cylinder (4) is connected to the flat end cap (3) at the lower end of the header. A water outlet (5) is provided at the lower end of the condensate collection cylinder (4). A condensate discharge riser (6) is connected to the water outlet (5). An electrically controlled shut-off valve (7) is provided on the condensate discharge riser (6). A condensate level alarm sensor (8) and a limit level sensor (9) are respectively provided inside the condensate collection cylinder (4). The electrically controlled shut-off valve (7), the condensate level alarm sensor (8), and the limit level sensor (9) are electrically connected to the electric controller.

2. The automatic drainage mechanism for the boiler inlet header of a sintering flue gas purification device according to claim 1, characterized in that, A maintenance manual valve (10) is installed on the condensate collection riser (4); a spare manual shut-off valve (11) is installed on the condensate discharge riser (6).

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