JPS61195907A - Heat recovering device for blast furnace - Google Patents

Abstract

PURPOSE:To recover effectively heat by constituting a titled device in such a manner that part of the pure water formed by a deaerator can be utilized as a heat source for an absorption type refrigerator thereby decreasing the temp. of water for cooling the furnace body so that the cooling efficiency of the furnace body can be improved and the deaeration efficiency in the deaerator can be improved. CONSTITUTION:The cooling water for cooling the blast furnace body is separated to steam and pure water by a steam sepn. drum 2. The pure water is conducted as the cooling water to a furnace body cooler 3. On the other hand, the steam is fed to the deaerator 8 and part of the pure water which is deaerated and increased in the liquid temp. is supplied through a refrigerator feed water line 13 provided separately from a piping to a drum feed water pump 10 to a regenerator of and the absorption type refrigerator 15 where the pure water is used as the heat source for heat exchanging. The pure water which is decreased in the liquid temp. is taken out of the regenerator and is passed through a discharge line 16 connected to a feed water line 7 for supplying semi-pure water 5 to the deaerator 8 so that said water is mixed with the semi-pure water of the line 7. Since the semi-pure water increased in the liquid temp. is supplied to the deaerator 8, the deaeration efficiency of the deaerator 8 is improved and the liquid temp. of the pure water to be supplied from the deaerator 8 to the drum 2 is decreased, by which the cooling efficiency of the blast furnace 1 is increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an apparatus connected to use a part of pure water produced in a deaerator as a heat source for an absorption refrigerator. The present invention relates to a heat recovery device for a blast furnace that can lower the temperature of the furnace body cooling water and increase the furnace body cooling efficiency, further increase the deaeration efficiency in a deaerator, and effectively recover heat.

[Conventional technology and problems]

Traditionally, in blast furnaces, the reaction heat of the blast furnace is removed by cooling to protect the shell and bricks. This is generally done by a method of circulating and cooling.

However, if the cooling water used here contains carbon dioxide or oxygen, it may cause corrosion in the furnace body cooler, so as shown in the attached diagram,
Simple water from the water tank (5) is supplied to the deaerator water pump (
6), water is sprayed from the top of the deaerator (8), heating steam is blown into this spray, and the purified water produced by heating and deaeration is used. The water is sent to the steam/water separation drum (2) by the drum water supply pump aυ, and is naturally circulated to the furnace cooler (3). The steam generated by cooling the furnace body is separated from pure water by a steam/water separation drum (2)K, and is discharged from a steam exhaust pipe a9 and either dissipated or guided to a recovery device.

As a means for recovering and utilizing the steam generated here, a steam recovery device has been proposed that is used as heating steam for a deaerator (8). (%Kasho 58-15399
(No. 9) However, it is known that the cooling efficiency of a blast furnace is better when the temperature of the cooling water is lower, so the recovery device described above is not necessarily sufficient, and further cooling of the cooling water is necessary. desired.

[Means for solving problems]

As a result of devising a means to more effectively recover heat from a blast furnace, the present inventor found that the degassing efficiency in a deaerator increases as the temperature of semi-pure water supplied to the deaerator increases. On the other hand, absorption refrigerators are used as cooling devices in buildings, and steam or hot water is used as the heat source for the regenerator of the heat exchanger fluid. However, there are problems such as scale adhesion, corrosion, etc. occurring in the hot water piping system of this refrigerator, and if the steam is used as is, drainage will occur and energy loss will occur. The degassing efficiency is improved by using a portion of the pure water coming out of the deaerator as a heat source for the regenerator of the absorption chiller, and by mixing the deionized water coming out of the regenerator with the semi-pure water supplied to the deaerator. The present invention was developed based on the recognition that it is possible to increase the temperature of pure water, to lower the temperature of pure water, and to improve the cooling efficiency of a blast furnace, and to solve the above-mentioned problems that occur in absorption refrigerators. That is, the present invention separates cooling water for cooling the blast furnace body into steam and pure water in a steam/water separation drum, leads the pure water to a blast furnace cooler as cooling water, and deaerates cough steam to a deaerator. In a heat recovery device for a blast furnace, the deaerator deaerates pure water and supplies the deaerator to the steam-water separation drum. A water supply line for supplying part of the water as a heat source for absorption refrigeration, and a water supply line for returning pure water, which has undergone heat exchange from the absorption refrigeration machine and whose liquid temperature has been lowered, to the deaerator. This is a blast furnace heat recovery device that connects a furnace and an absorption/extraction refrigerator.

Next, the apparatus of the present invention will be explained based on the attached drawings.

〔Example〕

The figure is a schematic explanatory diagram showing an embodiment of the device of the present invention.

The pure water for cooling stored in the steam-water separation drum installed outside the blast furnace (1) is transferred to the bottom of the furnace body cooler (3) installed on the outer wall of the furnace body (1). (2) and the lower part of the furnace body cooler (3), and when it absorbs the heat of the blast furnace (1), it causes convection, and the furnace body cooler ( 3) - Steam-water separation drum (2) - Evaporative cooling by natural circulation takes place via the downcomer pipe (4). That is, it is heated while cooling the furnace wall in the furnace body cooler (3), and is extracted from above the furnace body cooler (3).
Steam and cooling pure water are separated in the steam/water separation drum (2), and the cooling pure water is circulated and supplied to the furnace body cooler (3), while the steam is separated as steam in the steam/water separation drum (2). Pure water for cooling to replenish the amount that is removed is supplied from the water supply tank (5) to semi-pure water (liquid temperature 2D'C1 pH 7-9, dissolved oxygen 0.1-O, O7 ppm) to the deaerator water supply pump. (6) passes through the water supply line (7), is supplied in the form of a spray to a deaerator (8) installed at the connection with the steam/water separation drum (2), and is separated in the steam/water separation drum (2). ,
Pass through the deaeration steam supply pipe (9) connecting the steam/water separation drum (2) and the deaerator (8), and adjust the pressure to 0.5 to 3 kg/cm with a pressure regulator provided midway. ” J/C [
1111, heated and deoxidized by the steam guided to the deaerator (8) and converted into pure water (liquid temperature 105-120°C, dissolved oxygen amount 0.007 ppm), drum water supply pump 1
B replenishes the supply to the steam/water separation drum (2). Gases such as oxygen degassed in the deaerator (8) are discharged from the gas vent (13).

Therefore, in the present invention, a part of the pure water that has been degassed in the deaerator (8) and whose liquid temperature has increased is provided separately from the pipe from the deaerator (8) to the drum water supply pump a0, Alternatively, the absorption type refrigeration system 9 is operated by the refrigerator hot water pump 04 through the refrigerator water supply line a3 branched from the piping.
The purified water is supplied to a filtrate generator (not shown) and used as a heat source for heating and concentrating the diluted lithium bromide solution, which has undergone heat exchange, for example, and the pure water whose liquid temperature has been lowered by about 10°C is discharged from the regenerator. The semi-pure water from the water tank (5) was mixed with the semi-pure water in the water supply line (7) through a discharge line a61 connected to the water supply line (7) that supplies the deaerator (8). Therefore, since the liquid temperature of simple water becomes high and is supplied to the deaerator (8), the deaeration efficiency of the deaerator (8) can be improved, and the deaerator (
8) to the steam/water separation drum (2) can be lowered, and the cooling efficiency of the blast furnace can be increased.

The cold water produced by the absorption chiller 051 is supplied to a fan coil α8 in an office, for example, by a cold water pump aη, as in the conventional manner, and is circulated and used to cool the room.

〔Effect of the invention〕

The present invention is a device that uses part of the high-temperature pure water produced in a deaerator as a heat source for an absorption refrigerator, and mixes the reduced-temperature pure water with the simple water supplied to the deaerator. As a result, the temperature of the standard water supplied to the deaerator can be increased, thereby increasing the deaeration efficiency of the deaerator, and the temperature of pure water can be lowered by 10 to 20'C, thereby increasing the cooling efficiency of the blast furnace. At the same time, it is possible to save energy for the heat source of the absorption chiller, there is no problem of scale adhesion or corrosion in the chiller, there is no energy loss, and it is possible to eliminate the scale removal cleaning of hot water system piping, which is effective. It is recognized that this method has a great effect in recovering heat from the blast furnace.

[Brief explanation of drawings]

The figure is a schematic explanatory diagram showing an embodiment of the device of the present invention.

Claims (1)

[Claims] Separating cooling water for cooling the blast furnace body into steam and pure water in a steam-water separation drum, guiding the pure water to a furnace body cooler as cooling water, and guiding the steam to a deaerator as degassing steam; On the other hand, in a blast furnace heat recovery device configured to supply pure water deaerated by the deaeration to the steam/water separation drum, a part of the pure water supplied from the deaerator to the steam/water separation drum is absorbed. The deaerator and absorption refrigerating system are connected by a refrigerating machine water supply line for supplying the refrigerating machine as a heat source, and a discharge line for returning pure water from the absorption refrigerating machine, which has undergone heat exchange and whose liquid temperature has been lowered, to the deaerator. A blast furnace heat recovery device that is connected to a blast furnace.