JPS621764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to equipment capable of removing dust from high-temperature, high-pressure gas containing dust and then recovering the energy contained in the gas, and in particular, the present invention relates to equipment that is capable of recovering energy contained in the gas after removing dust from high-temperature, high-pressure gas containing dust. Regarding equipment.

Conventionally, as shown in FIG. 1, high-pressure combustible dust-containing gas in a blast furnace 1 has been treated with a downstream device A that includes an energy recovery device. There is one in which a primary dust removal device 3 is provided in the flow path 2 between the gases to remove dust in the gas.

As shown in FIGS. 1 and 2, a two-stage dust removal valve 4, for example, is provided at the bottom of the primary dust removal device 3, and when removing dust, a second dust removal valve 4 is installed.
As shown in the figure, a considerable amount of dust is stored in the hopper of the primary dust removal device 3, and the first stage of the valve 4 is closed to prevent the high-pressure flammable gas from leaking to the outside.

However, if the dust layer inside the hopper is thin or unevenly distributed, the dust layer will not provide a sufficient seal, and this will cause the valve 4
There is a risk that the high-pressure, high-temperature flammable gas mentioned above may blow out.

When high-pressure, high-temperature flammable gas blows out like this,
There is a problem that not only is this dangerous, but also the energy recovery efficiency of the energy recovery device included in the downstream device A is reduced.

The present invention aims to solve these problems by safely and reliably discharging the dust separated by a dry dust removal device upstream of the energy recovery device out of the system.
On the other hand, we aim to provide a dust treatment device for high-pressure gas energy recovery equipment that can maintain energy recovery safely and with high efficiency by returning the purified gas to the downstream side of the system using the differential pressure within the system. purpose.

For this reason, the present invention provides a dry dust removal device that receives high-pressure gas containing dust and removes the dust;
The device is equipped with an energy recovery device that receives the high-pressure gas purified by the dry dust removal device and recovers its pressure energy, and a discharge pipe for the low-pressure gas discharged from the energy recovery device. It is equipped with a sealed water-adding type dust remover connected through a valve, and a communication pipe is provided for making the clean intermediate pressure gas, which has been slurried and separated from the dust in the closed water-adding type dust remover, to flow into the above-mentioned low pressure gas discharge pipe. It is characterized by the fact that it is located

Hereinafter, a dust processing device for a high-pressure gas energy recovery facility as an embodiment of the present invention will be explained with reference to the drawings. FIG. 3 is a diagram showing the overall configuration. A primary dust removal device 3 with a dust extraction valve 4 is provided, and further downstream of this primary dust removal device 3, a main dry dust removal device 5 such as an electrostatic precipitator is provided.
is connected.

Furthermore, an energy recovery device 14 is connected to the downstream side of the dry dust removal device 5 for receiving the high pressure and high temperature gas cleaned by the dry dust removal device 5 through the flow path 13 and recovering the pressure and heat energy. ing.

Note that this energy recovery device 14 includes:
An example is a power generation device, but in this case, if dust hits the blades of the turbine that drives the generator, the blades may wear out and impair the turbine's function, so an inflow of clean, high-pressure, high-temperature gas is required. That's what I do.

Further, on the downstream side of the energy recovery device 14,
A discharge pipe 15 for low-pressure low-temperature gas to be discharged is connected, and another device B is connected to this discharge pipe 15.

By the way, a plurality of valves 6 are provided at the lower part of the dry dust removing device 5, and the amount of the mixture of dust and gas can be adjusted between the valves 6.

Further, each valve 6 is connected to a sealed water-adding type dust remover 8 via a conveying pipe 7.

In addition, a part of the conveyance pipe 7 can also be replaced with a mechanical conveyor.

A water supply pipe 9 for supplying pressurized water to the inside of the dust remover is connected to the upper part of the dust remover 8, so that the pressurized water from the water supply pipe 9 and the dust from the conveying pipe 7 are collected inside the dust remover 8. The gas is mixed to form a slurry, and the dust in the gas is removed.

Further, the lower hopper of the dust remover 8 is provided with a valve 10 for occasionally discharging the bottom sludge, and a pressure reducing valve that opens and closes in conjunction with the pressure inside the dust remover 8 so that the lower hopper is always sealed with water. 11 are provided.

A post-processing device (not shown) under atmospheric pressure is connected to the pressure-reducing valve 11, so that the slurry-formed dust passes through the pressure-reducing valve 11 and is processed by the post-processing device. .

Note that it is desirable to use a bench uri scrubber as this closed water-adding type dust remover 8 in order to improve its dust removal effect.

Furthermore, a communication pipe 12 is interposed between the sealed hydrostatic dust remover 8 and the low-pressure gas discharge pipe 15, and the clean medium-pressure low-temperature gas separated by the dust remover 8 is transferred to the communication pipe 12. 12 to join the discharge pipe 15 and be returned.

Note that the gas pressure in the communication pipe 12 is lower than the pressure in the dry dust remover 5 by an amount corresponding to the pressure loss necessary for the dust removing action in the dust remover 8.

Note that the communication pipe 12 is provided with an adjustment/pressure reducing valve 16 for adjusting the gas amount in the conveying pipe 7 and for adjusting the pressure with respect to the downstream side.

Further, the gas in the exhaust pipe 15 is supplied to another device B further downstream.

Incidentally, the dust removed by the dry type dust remover 5 is collected at the lower part of the dry type dust remover 5, and together with a part of the gas introduced into the dry type dust remover 5, the dust is passed through a valve 6 to a conveyor pipe 7 (including the case where a part is a mechanical conveyor). .)
The dust is then sent to a sealed water-adding dust remover 8.

In the dust remover 8, the dust introduced through the transport pipe 7 is slurried with pressurized water, and the high-pressure high-temperature gas introduced together with the dust is separated as purified medium-pressure low-temperature gas.

Note that the slurried dust is removed from the pressure reducing valve 11.
It is sent to a post-processing device (not shown) under atmospheric pressure while being pressure regulated. On the other hand, the purified medium-pressure low-temperature gas is sent through the communication pipe 12 and the pressure regulating/reducing valve 16 to join with the low-pressure low-temperature gas in the low-pressure low-temperature gas discharge pipe 15 .

As a result, only the dust is turned into a slurry and is reliably discharged to the outside, while the gas is returned to the system without leaking to the outside, greatly improving safety.

By the way, the gas and dust passing through the conveying pipe 7 and the gas passing through the communication pipe 12 have a sufficiently high pressure after passing through the sealed hydrostatic dust remover 8 and a low pressure in the downstream discharge pipe 15 of the energy recovery device 14. Since it is driven by the differential pressure ventilation force between Since this is carried out using differential pressure, there is no need to provide a separate drive source for dust discharge.

Note that the amount of gas required to pass through the conveying pipe 7 is determined from the weight ratio to the amount of dust, etc., but this amount of gas can be determined based on the above-mentioned differential pressure ventilation force, the pipe diameter, etc.

As described in detail above, according to the dust treatment device for high-pressure gas energy recovery equipment of the present invention, a closed water-adding dust remover is provided at the bottom of the dry dust removal device through a valve. Since a communication pipe is provided for making the clean medium-pressure gas separated by slurrying the dust into the low-pressure gas discharge pipe, the following effects and advantages can be obtained.

(1) The dust is turned into a slurry in a sealed water-adding dust remover and is reliably discharged to the outside, while the gas inside the system does not leak to the outside at all, greatly improving safety and improving energy recovery efficiency. can sufficiently prevent a decrease in

(2) Since dust is discharged using a sealed water-adding dust remover, mechanical dust seals, etc. can be eliminated, thereby eliminating the need for complex valve mechanisms.

(3) Since dust and gas can be discharged and transported using differential pressures inside and outside the system and within the system, there is no need to provide a separate drive source as a transport means.

[Brief explanation of the drawing]

Figures 1 and 2 show an example of a conventional downstream device including an energy recovery device for high-pressure combustible dust-containing gas, a primary dust removal device upstream thereof, and an attached dust removal valve. The configuration diagram, FIG. 2 is a schematic diagram showing the lower hopper and valve portion of the primary dust removal device, and FIG. 3 is an overall diagram showing the dust treatment device of high pressure gas energy recovery equipment as an embodiment of the present invention. FIG. 1...Blast furnace, 2...Flow path, 3...Primary dust removal device, 4...Dust removal valve, 5...Dry dust removal device, 6...Valve, 7...Transport pipe, 8...Sealed water-added dust removal device vessel, 9... water supply pipe, 10... sludge valve, 11... pressure reduction valve, 12... communication pipe, 13... flow path, 14... energy recovery device, 15... discharge pipe, 16... adjustment・Pressure reducing valve.

Claims (1)

[Claims] 1. A dry dust removal device that receives high pressure gas containing dust and removes the dust, an energy recovery device that receives the high pressure gas purified by this dry dust removal device and recovers its pressure energy, and from this energy recovery device. It is equipped with an exhaust pipe for the low-pressure gas to be discharged, and is also equipped with a sealed water-adding dust remover connected to the lower part of the dry dust remover through a valve, and the dust is slurried and separated in this closed water-adding dust remover. A dust processing device for a high-pressure gas energy recovery facility, characterized in that a communication pipe is provided for making the clean intermediate-pressure gas join the low-pressure gas discharge pipe.