JPS61159486A - Method and apparatus for cooling coke powder in dry coke quenching equipment - Google Patents

Abstract

PURPOSE:To recover efficiently the sensible heat of coke powder, by introducing high-temperature coke powder recovered by a dust remover into part of a low-temperature recycling gas to be recycled from a boiler to a cooling tower, to thereby quench it. CONSTITUTION:High-temperature coke powder collected by a dust remover 12 is stored in a discharging pipe 13. When the height of the accumulated coke powder reaches the upper limit, a detecting signal is output from a level sensor 25, a rotary valve 14 is operated by a control board 26 to draw out a given quantity of coke powder and the coke powder is fed to a branched path L for recycling gas and introduced into low-temperature recycling gas fed through a flow control valve 21 from a boiler 2. While quenching the mixture in a cooling pipe 15, it is fed to a cyclone dust remover 16 to collect coke powder, which is then stored in a discharge pipe 17. The recycling gas from which coke powder is removed is combined with high-temperature recycling gas from the dust remover 12 and recycled to the boiler 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coke dry extinguishing system: a method and apparatus for cooling coke powder, which rapidly cools high-temperature coke powder recovered from circulating gas for cooling red-hot coke in a coke dry extinguishing system. Regarding.

[Conventional technology]

As shown in FIG. 2, the coke dry extinguishing equipment circulates inert cooling gas between a cooling tower 1 and a boiler 2 in the direction of the arrow in the figure. In the cooling tower 1, the red-hot coke charged into the cooling tower 1 from above is cooled to a predetermined temperature by circulating gas, and the cooled coke is removed from the bottom of the cooling ME 1 by the cutting device 3. Cut 9.

The sensible heat of the red-hot coke is absorbed and the highly heated circulating gas enters the boiler 2, where the heat is recovered by generating steam. After the heat has been recovered, the circulating gas is sent under pressure to the cooling tower again by a circulation fan. A collision-inversion type dust remover 5 and a cyclone dust remover 6 are installed. It plays a major role in reducing boiler tube wear.

The problem here is the dust particles collected by the dust remover 5. This coke powder is heated to a high temperature of approximately 800℃.
There is a danger of the discharge igniting.Therefore, it is necessary to cool the coke.

Conventionally, the cooling device for powdered coke is constructed as shown in FIG.
After being cooled in this water-cooled pipe 7, it is cut out by the rotor 11 valve 8 and discharged into the storage bin 9. The water cooling pipe 7 is a double pipe, and cooling water is passed through the outer circumferential side in the direction of the arrow in the figure, and coke powder is passed through the center to cool it. The coke powder is stored in the water-cooled pipe 7 to maintain the gusset II seal, and when it is stored up to the upper limit position detected by the level switch 10, it is cut out by the rotary valve 8 in fixed amounts. 11 in the figure is a control panel.

In this way, conventional coke breeze cooling is done by water cooling.

[Problem that the invention seeks to solve]

The conventional water cooling system described above has the following problems.

■ Since coke powder has low thermal conductivity, the water cooling pipe 7 needs to be thin and long. As a precaution, if the amount of coke breeze recovered by the dust remover 5 is large, a large number of water-cooled pipes 7' must be provided to distribute the coke breeze. This becomes a serious problem especially when the dust remover 5 is of a cyclone type to enhance the collection of coke breeze.

■ Sensible heat from coke powder was wasted and was uneconomical.

■ A large amount of cooling water is required), and the burden of securing water resources and power is large.

This invention solves these conventional problems.

Ninth Means for Solving Problem c] The method for cooling coke breeze in a coke dry extinguishing system according to the present invention divides a part of the low-temperature circulating gas that exits the boiler and enters the cooling tower, and during the diversion, Collected by a dust remover, high-temperature coke powder is added to rapidly cool the coke powder, and then the rapidly cooled coke powder is recovered from the circulating gas, and the circulating gas that removes heat from the coke powder is sent to the boiler circle. It is characterized by returning to.

In addition, the coke breeze cooling device of the present invention that implements the above method is provided with a branch path for returning a portion of the low-temperature circulating gas that exits the boiler and enters the cooling tower to the boiler, and in this branch path, a dust remover is installed. The present invention is characterized by being equipped with a cooling pipe that introduces recovered coke powder at a high temperature and rapidly cools the coke powder, and a cyclone dust remover that recovers the coke powder that is rapidly cooled by the cooling pipe.

〔Example〕

Hereinafter, an example of this invention will be explained based on FIG. 1. Incidentally, the same parts as those in the nine conventional examples described above are given the same reference numerals, and the description thereof will be omitted.

First, the configuration of the apparatus of the present invention will be explained.

In this example, a cyclone type dust remover 12 is used as a dust remover for recovering coke breeze from the high-temperature circulating gas that exits the cooling tower and enters the boiler 2. This dust remover 12
The powder/gas discharge pipe 13 on the lower side is connected to a branch path for circulating gas via an a-tally valve 14. The branch passages are a series of bypass passages that take in a portion of the cold circulating gas exiting the boiler 2 and being returned to the cooling tower, and return the taken circulating gas to the inlet of the boiler 2. This branch path is provided with a cooling pipe 15 into which the coke breeze from the dust remover 12 enters, and a cyclone dust remover 16 that recovers the coke breeze from the circulating gas.

Coke powder discharge pipe 1 on the lower side of this cyclone dust remover 16
7Fi, low/17 through valve 18 to storage bin 19.

A flow meter 20 and a flow control valve 21 are installed at a location near the entrance in the branch path, and a thermometer 2 is installed at a location near the exit.
2 are provided. The coke powder discharge pipe 17 of the cyclone dust remover 16 is equipped with a thermometer 23. The detection signals of these flowmeters 20 and thermometers 22 and 23 are sent to the computing unit 2.
4, and the computing unit 24 adjusts the opening degree of the flow control valve 21 based on these detection signals as described later.

C: in the discharge pipe 13 of the dust remover 12 is equipped with a level sensor 25 that detects that coke breeze has accumulated up to the upper limit of the discharge pipe 13, and the detection signal of this level sensor 25 is inputted to control the A board 26 controls rotary valve 14.

Similarly, the discharge pipe 17 of the cyclone dust remover 16 is provided with a level sensor 27 for detecting that dust has accumulated up to the upper limit of the discharge pipe 17. The control panel 28 into which the detection signal is input controls the rotary valve 18.

Next, the cooling method according to the present invention will be explained together with the operation of the above device.The high temperature (approximately 800°C) coke breeze collected by the dust remover 12 accumulates in the discharge pipe 13 and seals the material. When the coke breeze accumulates to the upper limit of the discharge pipe 13 and the level sensor 25 outputs a detection signal, the control panel 26 operates the rotary valve 14 to cut out a certain amount of the coke breeze. This cut coke breeze enters the circulating gas branch path. In the branch path, low temperature (lPJ 180°C) circulating gas from which heat has been removed in the boiler 2 flows through the flow rate adjustment valve 21, and enters the flow of this low temperature circulating gas and floats. The high temperature coke powder is guided into the cyclone dust remover 17 while being rapidly cooled through a cooling pipe 15. Since the coke breeze is rapidly cooled, it is sufficient that the length of the cooling pipe 15 is relatively short. The cyclone dust remover 17 recaptures the rapidly cooled coke breeze and stores it in the discharge pipe 17 to maintain a material seal. The coke powder accumulates up to the upper limit of the discharge pipe 17 and the level sensor 2
7 outputs a detection signal, the control panel 28
8 is activated to cut out a certain amount of coke breeze into the storage bin 19. The coke powder in this storage bin 19 is
It has already been cooled down to about 180°C or less. The circulating gas after the cyclone dust remover 17 collects the coke powder is combined with the high-temperature circulating gas from the dust remover 122) and others, and is returned to the boiler 2. From cyclone dust remover 16 to boiler 2
The circulating gas that returns to the coke becomes high temperature (approximately 200 to 300°C) by taking away the sensible heat from the high-temperature coke breeze. Therefore, the sensible heat of the high temperature coke breeze collected by the dust remover 12 is recovered by the boiler 2.

The flow control valve 21 is controlled by the computing unit 24 as follows (1).

It is controlled to satisfy the conditions (il) and (Ill).

(1) Once the collection efficiency of the cyclone dust remover 16 is determined, adjust the air volume so that it does not fall below a certain level.

(II) Adjust the air volume to raise the temperature of the circulating gas coming out of the cyclone dust remover 16 as much as possible.

The temperature of the circulating gas is detected by the temperature gauge 22.

GID Cyclone Dust Removal II! i! 16 discharge pipes 17
Adjust the air volume so that the temperature of the coke powder inside does not rise above a certain level! ! 1lpeI. The temperature of the coke powder is 2 thermometers.
Detected by 3.

By the way, depending on the above-mentioned beating conditions, the cyclone dust remover 1
Ninth, by controlling the temperature of the circulating gas returning from the boiler 2 to the boiler 2 at a high temperature, the drop in the inlet temperature of the boiler 2 can be suppressed to a small level.

In the above example, a cyclone type dust remover 12 that can collect a large amount of coke powder is used. This is because a large amount of coke powder can be efficiently cooled, and a large amount of coke powder can be re-collected in the cyclone dust remover 16.In addition, various types of dust remover 12 can be used. can.

[Effects of the Invention] As explained above, this invention directly cools high-temperature coke breeze by the low-temperature circulating gas after heat recovery in a boiler, and then recaptures the cooled coke breeze. At the same time, the circulating gas that has taken heat from the coke powder is introduced again into the boiler 1. Therefore, the coke powder is rapidly cooled while floating the high-temperature coke powder in the low-temperature circulating gas. Therefore, the cooling pipes located at important locations for cooling coke breeze can be shortened, and the apparatus itself can be made compact.

Nineteenth, the sensible heat of coke powder can be effectively recovered,
Moreover, it does not require large amounts of cooling water like conventional methods.
Energy saving can be achieved.

It is also possible to fully cope with the case where a cyclone type device that collects a large amount of coke powder is used as a dust remover to collect high-temperature coke powder that should be cooled.

[Brief explanation of drawings]

Figure K1 is a schematic configuration diagram of the coke powder cooling device according to the present invention, Figure 2 is a schematic explanatory diagram of the entire coke dry extinguishing equipment,
FIG. 3 is a schematic diagram of a conventional coke breeze cooling device. l... Cooling tower, 2... Boiler, 12.
...Dust remover, 15...Cooling pipe, 16...
...Cyclone dust remover, L... Branch road. Figure 1

Claims (2)

[Claims] (1) In a coke dry extinguishing system equipped with a dust remover to collect high-temperature coke powder from the circulating gas in the flow path of the high-temperature circulating gas that exits the red-hot coke cooling tower and enters the boiler, part of the low-temperature circulating gas entering the cooling tower is diverted, and the high-temperature coke powder recovered by the dust remover is introduced into the diverted flow, and the coke powder is rapidly cooled.
Then, the quenched coke powder is recovered from the circulating gas, and the circulating gas, which has taken heat from the coke powder, is returned to the boiler circle. (2) In coke dry extinguishing equipment, a coke dry extinguishing system is equipped with a dust remover that collects high-temperature coke powder from the circulating gas in the flow path of the high-temperature circulating gas that exits the red-hot coke cooling tower and enters the boiler. A branch path is provided in which part of the low-temperature circulating gas that exits and enters the cooling tower returns to the boiler, and in this branch path,
A coke characterized by comprising: a cooling pipe that introduces the high temperature coke powder collected by the dust remover and rapidly cools the coke powder; and a cyclone dust remover that collects the coke powder that has been rapidly cooled by the cooling pipe. Coke powder cooling system for dry fire extinguishing equipment.