CN201406440Y - Blast furnace gas dry dust removal heat pipe heating and cooling device - Google Patents

Abstract

A heating and cooling device for blast furnace gas dry dust removal heat pipe, the device includes: heat exchanger body, heat pipe, steam or soft water bag in the center of heat exchanger, soft water or steam bag on the upper part of heat exchanger, regular sewage discharge pipe, continuous sewage discharge pipe, Safety valves, relief valves, steam traps, condensate tanks, condensate filters, condensate pumps, check valves, globe valves. There are many heat pipes placed horizontally on the central steam or soft water bag in the heat exchanger for heat transfer; the upper part of the central steam or soft water bag of the heat exchanger is connected to the soft water or steam bag on the upper part of the heat exchanger; the lower part is connected to the condensate tank, condensate pump and filter The pipeline is equipped with traps, check valves and stop valves, and the condensate pipeline is connected to the soft water system of the blast furnace water pump room. The advantage is that the functions of gas raising and cooling of the heat exchanger are combined into one, the equipment is small in size, low in investment and good in effect, and is suitable for dry dust removal of blast furnace gas.

Description

Blast furnace gas dry dust removal heat pipe heating and cooling device

technical field

The utility model belongs to the technical field of blast furnace ironmaking in the iron and steel industry, and provides a blast furnace gas dry dust removal heat pipe heating and cooling device, which is suitable for the gas heating and cooling technology of the blast furnace gas dry dust removal technology.

Background technique

Blast furnace gas dry dedusting is a new technology of gas dedusting. The principle is to use high-temperature filter material to purify gas by filtering, which is different from traditional wet dust removal.

Dry dust removal has the advantages of good purification quality, energy saving, water saving, environmental protection, less land occupation, low investment and production costs, etc., so it has a good development prospect.

High-temperature filter materials have certain temperature requirements. At present, the applicable temperature of several filter materials is 100-220°C, and the maximum temperature does not exceed 260-280°C. If the temperature is too high, it should be properly controlled, otherwise it will affect the performance of the filter bag and reduce the service life.

It is easy to condense at low temperature, and it is easy to stick the filter bag and affect the operation. In the early stage of furnace start-up, due to the high moisture in the gas and the low furnace top temperature, the impact is particularly serious. These problems do not exist in wet dust removal.

The top temperature of blast furnace is generally in the range of 150-250°C, but due to the changeable smelting conditions, it is common for the temperature to be too high or too low. And the temperature is often on the low side, sometimes only about 100°C, so it is necessary to control the gas temperature when using dry dust removal.

Operationally, the gas temperature is not easy to control. In addition to spraying water on the top of the furnace to cool down the high temperature, the heat exchanger can be used to further cool down before entering the cloth bag. At present, there are two types of cooling heat exchangers: one is the tube heat exchanger, that is, the seamless steel pipe group is used as the cooling equipment, and the hot gas is naturally radiated and cooled in the tube; the other is the heat pipe heat exchanger, which uses the heat pipe principle to transfer heat cool down. However, there is no way to raise the temperature. The hot flue gas heating method was used to raise the temperature, that is, the gas passes through the exhaust pipe, and the blast furnace gas is burned externally to heat the temperature, which has a certain effect. Although there are many other schemes, it is difficult to practice, and even if it is feasible, it is quite complicated. In addition, adding a heating device will make the system huge, take up a lot of land, and the investment will also increase significantly.

In fact, whether the temperature rises or falls by 50°C, if a set of equipment can be used to heat up and cool down, the combination of the two functions will make the dry dust removal technology more advanced and applicable. The utility model utilizes the heat transfer principle of a heat pipe to complete a temperature regulating device capable of both heating and cooling.

Contents of the invention

The purpose of the utility model is to provide a blast furnace gas dry dust removal heat pipe heating and cooling device, which is especially suitable for blast furnace gas dry dust removal. The main body of the device is a heat exchanger, which combines the functions of gas raising and cooling into one, with small size and low investment.

The utility model comprises: a heat exchanger body, a heat pipe, a steam or soft water bag in the center of the heat exchanger, a soft water or steam bag on the upper part of the heat exchanger, a steam trap, a condensed water tank, a condensed water filter, a condensed water pump, a check valve, and a cut-off valve. Valves, periodic blowdown pipes, continuous blowdown pipes, safety valves, relief valves. The main body is a heat exchanger with a central steam or soft water bag and a large number of horizontal heat pipes on the bag. The steam or soft water bag in the center of the heat exchanger is connected to the soft water or steam bag on the upper part of the heat exchanger; the steam or soft water bag in the center of the heat exchanger is connected to the condensate tank, condensate pump and filter, and the pipeline is equipped with a drain valve and a check valve , Stop valve, condensed water pipeline is connected to the soft water system of the blast furnace water pump station; use the heat pipe heat transfer principle to heat up or cool down the gas.

The heat pipe is welded on the shell of the steam or soft water bag in the center of the heat exchanger and placed horizontally; the surface of the heat pipe on the side where the steam or soft water flows outside the center of the heat exchanger is welded with longitudinal fins to increase the heat transfer area of the heat pipe. Brazing or spraying nickel-chromium wear-resistant material.

When the steam or soft water bag in the center of the heat exchanger is filled with soft water and communicated with the soft water or steam bag in the upper part of the heat exchanger, the task of heat dissipation and cooling of gas is completed; Complete the gas heating and heating up task. One device can have both heating and cooling functions.

When the gas temperature control device needs to be heated up, there are saturated steam supply pipes and condensate recovery facilities such as: condensate tanks, condensate pumps, valves, etc.; when the gas needs to be cooled, there are water supply pipelines, upper steam drums and steam release device to achieve gas cooling.

The principle of the utility model is: use heat pipe technology to realize temperature rise and fall. The heat exchanger is a casing structure, the outer ring is fed with gas; the center pack is passed through steam or soft water, and the heat is transferred between the inner and outer layers by the heat pipe welded on the center pack shell.

When the gas is heated and the temperature rises, the center bag is filled with saturated steam. Closely arranged heat pipes transfer the steam heat to the outer ring gas to heat it up. The heat transfer process mainly uses the principle of phase change heat: one is that the steam condensation process releases a large amount of condensation heat to heat the gas, and the other is that the heat pipe uses the phase change principle to conduct heat, with large heat transfer and high thermal efficiency.

The cooling principle is to use the same set of equipment and the same set of heat pipes for heat exchange, but the center bag is changed from steam to soft water as the cooling medium. The high-temperature gas transfers heat to the water through the heat pipe, and the heating causes the water to vaporize and take away the heat to complete the cooling of the gas.

The key to the dual-function heat pipe heat exchanger is that the heat pipe needs to be placed horizontally, so that it can transfer heat quickly whether it is heating or cooling. The medium in the center bag of different functions is different: when the gas is heated, it is saturated steam; when it is cooled, it is changed to soft water, and the conversion is performed as required.

In order to increase the heat exchange area between the gas and the heat pipe, longitudinal fins are welded on the surface of the heat pipe on the side where the gas flows outside the steam or soft water bag in the center of the heat exchanger. In order to prevent wear and tear caused by dusty gas, the outer surface of the heat pipe is sprayed or brazed with a certain thickness of hard wear-resistant material.

The heat exchanger is designed as a pressure vessel. There is a corrugated expander at the gas inlet and outlet, and the connecting pipe fittings of the center package have a certain bend to eliminate thermal stress.

Because heating or cooling is used intermittently, the heat exchanger is installed on the parallel pipeline before the inlet of the dry bag filter, and can be connected or removed as needed.

The heat transfer efficiency of the heat pipe is very high, and it has dual functions, and the volume is small, so it is very distinctive.

The advantages of the present invention are:

Whether it is heating up or cooling down, heat pipes are used to transfer heat, and phase change heat is used for heat exchange. The heat transfer is large and the thermal efficiency is high. Therefore, the heat transfer area is much smaller than that of the tubular surface heat exchanger, and the heating or cooling effect better. The equipment has a long service life, occupies a small area, and the investment is only equivalent to or slightly higher than that of the existing cooling device. There are complete steam supply and water supply and drainage devices to ensure the normal operation of the system.

Description of drawings

Figure 1 is a diagram of a heat pipe heating and cooling device. Among them, the heat exchanger body 1, the heat pipe 2, the steam or soft water bag in the center of the heat exchanger 3, the soft water or steam bag on the upper part of the heat exchanger 4, the steam trap 5, the condensate tank 6, the condensate filter 7, the condensate pump 8 , Check valve 9, stop valve 10, regular blowdown pipe 11, continuous blowdown pipe 12, safety valve 13, release valve 14.

Detailed ways

The steam or soft water bag 3 in the center of the heat exchanger is connected to the steam or soft water bag 4 on the upper part of the heat exchanger through pipelines; the lower part is connected to the condensed water tank 6 . The center bag is connected with the steam pipe and the soft water pipeline, which can pass through both saturated steam and soft water.

There is a spray coating with a certain thickness in the heat exchanger shell to insulate heat and prevent wear. There are manholes for maintenance on the top and bottom of the shell.

The heat pipe heat exchanger body 1 and the steam or soft water bag 3 in the center of the built-in heat exchanger are both pressure vessels, and thousands of horizontally placed heat pipes 2 are installed on the shell of the heat exchanger center steam or soft water bag 3 . When the gas needs to be heated up, saturated steam is introduced into the central bag, and the heat pipe transfers the heat of the steam to the raw gas on the outside to heat it up. After heat transfer, the steam becomes condensed water, which is recovered through steam trap 5, condensed water tank 6, filter 7, condensed water pump 8, check valve 9, and stop valve 10. When the gas needs to cool down, the steam in the center bag of the heat exchanger is replaced with soft water, and the heat of the high-temperature gas is transferred to the water through the heat pipe, so that the soft water vaporizes and the steam escapes, thereby cooling the gas; the soft water or steam bag 4 on the upper part of the heat exchanger should be kept at a certain The water level has the effect of steam-water separation, and the soft water or steam drum 4 on the upper part of the heat exchanger has a safety valve 13, a steam release valve 14, a regular sewage discharge pipe 11, a continuous sewage discharge pipe 12 and a water supply pipeline.

Because the heat pipe is placed horizontally, it can transfer heat in two directions, and changing different media can heat or cool the gas, making it warm up or cool down.

Claims (5)

1, a kind of blast furnace gas dry dusting heat pipe heating-cooling device; Comprise: the soft water on heat exchanger body, heat pipe, interchanger center steam or soft water bag, interchanger top or steam pockets, drain valve, condensation water tank, water of condensation strainer, condensate pump, vacuum breaker, stopping valve, periodic blow down pipe, continuous blowdown pipe, safety valve, diffuse valve; It is characterized in that: establish center steam or soft water bag in the interchanger and wrap numerous heat pipes; Interchanger center steam or soft water bag (3) are gone up and are linked to each other with the soft water or the steam pockets (4) on interchanger top; Interchanger center steam or soft water bag (3) link to each other with condensation water tank (6), condensate pump (8) and strainer (7) down, and pipeline also is provided with drain valve (5), vacuum breaker (9), stopping valve (10), and the water of condensation recycling pipeline links to each other with blast furnace pump works soft water system; Heat pipe (2) is welded on pericardium in the interchanger (3) housing, horizontal positioned; Heat pipe (2) surface of interchanger center steam or outer flow of gas one side of soft water bag (3) is welded with longitudinal fin.

2, device as claimed in claim 1 is characterized in that: heat pipe surface soldering or spraying nickel chromium triangle matter high-abrasive material.

3, as claims 1 described device, it is characterized in that: have access opening on the heat exchanger shell, the shell inner surface spraying wear-resistant materials.

4, hot tube heat exchanger body (1) and built-in heat exchanger center steam or soft water bag (3) are pressurized vessel, the heat pipe of peace horizontal positioned on interchanger center steam or soft water bag (3) housing.

5, device as claimed in claim 1 is characterized in that: have safety valve (13), steam to diffuse valve (14), periodic blow down pipe (11), continuous blowdown pipe (12) and water pipe on the soft water on interchanger top or the steam pockets (4).