CN201277706Y - Temperature keeping apparatus for heat accumulation type hot air stove - Google Patents

Abstract

The utility model belongs to the field of regenerative heat exchangers, in particular to a heat preservation device for a blast furnace hot blast stove. The technical proposal includes a combustion air main pipe and a mixed air main pipe, and a reverse air supply pipe is installed between the combustion air main pipe and the mixed air main pipe. , Set a valve on the reverse air duct. Compared with the prior art, the utility model only needs to install a reverse air pipe and a valve between the combustion air main pipe and the mixed air main pipe. When the blast furnace needs to be kept warm for maintenance or shutdown, the valve is opened to let the combustion air above 180°C pass through. The air mixing pipe is fed into the regenerator in reverse, and the heat of the combustion air is used for heat preservation, which can not only save energy and protect the environment, but also can be reused many times, and the operation is simple.

Description

Regenerative hot blast furnace insulation device

technical field

The utility model belongs to the field of regenerative heat exchangers, in particular to a thermal insulation device for blast furnace hot blast stoves

Background technique

The hot blast stove is an important equipment in the process of ironmaking production. It supplies hot air to the blast furnace to increase the output of the blast furnace, reduce energy consumption, improve the quality of pig iron and reduce the cost of ironmaking. At present, hot blast stoves are roughly divided into internal combustion hot blast stoves, external combustion hot blast stoves and top combustion hot blast stoves. In order to increase the wind temperature, the common thing is to use silica bricks in the high temperature area, but silica bricks have a big disadvantage, that is, poor volume stability at low temperatures. The hot blast stove built with silica bricks does not allow the temperature to drop too fast, and must be kept above 600 °C. Therefore, it is very important to adopt reasonable heat preservation measures during the shutdown of the blast furnace. At present, the heat preservation method of the hot blast stove has the method of "internal combustion heating, air supply cooling". Anshan Iron and Steel No. 10 blast furnace was shut down for one month in 1994. The heat preservation method was to install a burner in the regenerator. When the temperature of the vault was lower than 750°C, it would be heated by combustion. When the temperature of the exhaust gas was higher than 350°C, a small air volume was used. Cooled, this method was used to successfully insulate for 138 days. Although this method can keep the silica brick hot-blast stove warm, its waste of heat energy is large and must be removed after use, and the operation is loaded down with trivial details. In order to improve the air temperature and combustion efficiency of the hot blast stove, the method of increasing the temperature of the combustion-supporting air is adopted. At present, the temperature of the combustion-supporting air is kept above 180°C. For this reason, some manufacturers set up a group of 800mm main pipes from the outlet of the combustion-supporting fan to guide the branch pipes with a diameter of 600mm to the manholes in the lower part of the regenerator of each hot blast stove and install shut-off valves. The combustion-supporting fan introduces combustion-supporting air above 180°C into the regenerator to keep the temperature of the silica brick in the regenerator above 700°C. Although this method can reduce heat energy consumption, the operation is still loaded down with trivial details, and the pipeline must be removed after use, otherwise normal production will be affected.

Contents of the invention

In order to overcome the defects and deficiencies in the prior art, the purpose of this utility model is to provide a thermal storage device for hot blast stoves. It can save energy and protect the environment, can be used repeatedly, and is easy to operate.

In order to achieve the above purpose, the technical solution of the utility model includes a combustion air main pipe and a mixed air main pipe, and a reverse air supply pipe is installed between the combustion air main pipe and the mixed air main pipe, and a valve is arranged on the reverse air supply pipe.

Compared with the prior art, the utility model only needs to install a reverse air pipe and a valve between the combustion air main pipe and the mixed air main pipe. When the blast furnace needs to be kept warm for maintenance or shutdown, the valve is opened to let the combustion air above 180°C pass through. The air mixing pipe is fed into the regenerator in reverse, and the heat of the combustion air is used for heat preservation, which can not only save energy and protect the environment, but also can be reused many times, and the operation is simple.

Description of drawings

The embodiment of the utility model will be further described below in conjunction with the accompanying drawings.

Figure 1: Schematic diagram of the layout of the external-combustion regenerative hot blast stove

Detailed ways

The utility model will be described in detail below with the external combustion type hot blast stove as an example;

As shown in Figure 1, the external combustion hot blast stove includes a combustion chamber 5, a regenerator 4, a mixed air main pipe 1, a combustion air main pipe 2, gas pipes, cold air pipes, hot air pipes, flue and other pipes and valves. The working process of the hot blast stove is roughly as follows: close the hot air and cold air pipes, feed gas and combustion air into the combustion chamber 5 through the gas pipe and the combustion air pipe, the burner burns and heats, and the heat is collected by the checker bricks in the regenerator 4. When burning The flue gas produced is discharged out of the chimney along the flue pipe at the bottom of the hot blast stove. After the heat is stored, the gas, combustion air, and flue gas pipeline valves are closed. When the cold air passes through the regenerator, the heat stored in the regenerator heats up and reaches the temperature required by the blast furnace to become hot air, which is raised to the blast furnace by the hot air pipe. As shown in Figure 1, when the blast furnace needs to be kept warm for maintenance or shutdown, first close all valves, then open the valve on the reverse air supply pipe 3 connecting the air mixing main pipe 1 and the combustion air main pipe 2, and the hot combustion air passes through Air mixing main pipe 1 reversely sends air into regenerator 4 for heat preservation. Just close the valve when the heat preservation is not needed.

Claims (1)

1. A thermal storage device for a regenerative hot blast stove, comprising a combustion-supporting air main pipe and a mixed-air main pipe, characterized in that: a reverse air supply pipe is installed between the combustion-supporting air main pipe and the mixed air main pipe, and the reverse air supply pipe is set valve.

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