JPS63243697A - Heat exchanger provided with shot cleaning device - Google Patents

Abstract

PURPOSE:To make inert gas unnecessary and improve safety, by providing a hopper, employing water, instead of a lock hopper for pressurizing gas to pressurize a vessel by employing water. CONSTITUTION:Steel balls 24, stored in the separate filter of a receiving hopper 5, are dropped into a supply hopper 7 by opening an air-tight valve 6 and filling water. In this case, the steel balls 24 are stored on the separate filter in the supply hopper 7. Water is supplied by a feed water pump 9 into the supply hopper 7 through a water feeding valve 10 while the air-tight valve 6 is closed in the condition of full of water, in which the water overflows into the receiving hopper 5. Further, the supply hopper 7 is pressurized by employing the feed water pump 9 until the hopper 7 is pressurized by water to a pressure same as the gas pressure in the heat exchanger 2. Subsequently, an equalizing valve 11 is opened, then a water blow valve 12 is opened to drop water in the supply hopper 7 into a lower water tank 13. According to this operation, the steel balls 24 may be separated from water by the separating filter. next, a supply valve 14 is opened to drop the steel balls 24 into a heat exchanging unit 3 to effect soot blow, thereafter the steel balls 24 are retrieved into the lower water tank 13. Subsequently, water is supplied to discharge the gas in the heat exchanger.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a pressurized gas, toxic gas, flammable gas Sakaki heat exchanger installed in an exhaust gas economizer, a reaction vessel, etc. This invention relates to a heat exchanger equipped with a device for removing soot, and can be applied to a reaction vessel instead of a heat exchanger to remove soot from the reaction section.

[Conventional technology]

In a pressurized container or a container generating toxic gas, flammable gas, etc., in a heat exchanger equipped with a shot cleaning device that uses steel balls etc. to remove soot from the heat exchange part,
A lock hopper system using inert gas is used to supply and collect steel balls, etc.

A conventional system will be explained with reference to FIG. 4, which shows an example of a pressurized heat exchanger equipped with a shot cleaning device.

In the figure, gas enters a heat exchanger 2 through a gas introduction section 1, is cooled by a heat exchange section 3, and is then discharged to the outside of the device through a gas discharge section 4.

The soot contained in the gas mainly adheres to the heat exchange section 3. Steel balls, etc. to be used for the soot flow are transferred to the receiving hopper 5 and then to the airtight valve 6.
It enters the feed lock hopper 7 through the passage.

When the steel balls are filled into the rock hook 7, the airtight valve 6 is closed,
After the pressure in the supply lock hopper 7 is made the same as that in the heat exchanger 2 by pressurizing the supply lock hopper 7 with Cyinert gas or the like through the pressurization valve 8, the supply valve 9 is opened and the steel balls are allowed to fall into the heat exchanger 2. When the steel balls have finished falling, the supply valve 9 is closed and the purge valve 10 is closed.
After opening the supply lock hopper 7 and bringing the pressure inside the supply lock hopper 7 to normal pressure,
The fallen steel balls are waiting to be supplied from the receiving hopper 5 again.
It passes through the recovery valve 13 to the recovery hopper 12 which has the same pressure as the heat exchanger 2 due to the pressurizing valve 11 and is recovered. When the recovery is completed, the recovery valve 13 is closed and the purge valve 14 is opened to reduce the pressure inside the recovery hopper 12, and then the discharge valve 15 is opened, and the waste is again supplied to the receiving hopper 5 at the top of the container by air flow conveyance. Ru.

[Problem that the invention seeks to solve]

As mentioned above, in a heat exchanger that uses steel balls or the like for shot cleaning, if the gas inside is pressurized, flammable gas, or toxic gas, the following problems occur.

Since the supply and discharge of the bulbs come into contact with the outside atmosphere, a container such as a lock hopper is required, and the amount of inert gas consumed for this pressurization and depressurization is enormous.

Furthermore, when handling a dangerous gas such as a toxic gas as the gas inside the container, the lock hopper will have difficulty in resisting the leakage. For this reason, there is a problem with safety, and the amount of consumption of inert gas used as a pressurizing medium is enormous, resulting in a decrease in performance.

[Means for solving problems]

In order to solve the problems in the prior art described above, a hopper using water is provided as a replacement for the gas pressurized lock hopper. That is, the inside of the container is pressurized using water, which is an incompressible fluid, instead of pressurizing gas, which is a compressible fluid.

[Effect]

The internal gas of the heat exchanger and the steel balls used for shot cleaning are easily separated. This improves reliability in terms of both utility and safety. Furthermore, even if the internal gas is toxic or flammable, the water can push out the gas, eliminating the need for purging.

〔Example〕

In FIG. 1, 1 is a gas introduction part, 2 is a heat exchanger, 3 is a heat exchange part, 4 is a gas discharge part, 5 is a receiving valve, 6 is an airtight valve, 7 is a supply hopper, 8 is a separation filter, 9 is a water supply pump, 10 is a water supply valve, 11 is a pressure equalization valve, 12 is a water blow valve, 13 is a lower water tank, 14 is a supply valve, 15 is a collection hopper,
16 is a water supply valve, 17 is an airtight valve, 18 is a recovery valve, 19 is a pump such as a jet pump, addition is a circulation water tank, 21 is an over 70-pipe, n is a water washing or steam cleaning nozzle, n is a separation filter, and a drilling steel. Shots of balls, ceramic balls, etc., 5
is a steel ball receiving plate.

In such a device, pressurized gas, flammable gas, or combustible gas is passed through a heat exchanger 2 from a gas inlet 1, cooled in a heat exchanger 3, and then discharged from a gas outlet 4 to the outside of the device. is discharged to. The soot contained in the gas mainly adheres to the heat exchange section 3. A method for supplying steel balls and the like to the heat exchanger 2 and collecting them for shot cleaning will be explained step by step.

Shots such as steel balls used for shot cleaning of the soot blower are stored in the separation filter of the receiving hopper 5. When the airtight valve 6 is opened, the steel ball M is filled with water and the supply hopper 7 is opened.
let it fall. The steel balls are separated by the separation filter 8 inside the supply hopper.
It accumulates at the top of the. The water supply pump 9 supplies water to the supply hopper 7 via the water supply valve 1o. The airtight valve 6 is closed when the water overflows to the receiving hopper 5 side, and the water is further pressurized to the same pressure as the gas pressure inside the heat exchanger 2 using the water supply pump. (Increase the water pressure) When the supply hopper 7 is pressurized, the pressure equalization valve 11 is opened and the water blow valve 12 is opened to cause the water inside the supply hopper 7 to drop into the lower water tank 13. After this washing, the steel balls are separated from the water by a separation filter 8.

Next, the supply valve 14 is opened, and the steel balls are dropped into the heat exchange section 3 of the heat exchanger 2, soot blowing is performed by shot cleaning, and the steel balls are collected into the lower water tank 13. When the steel ball U falls from the supply hopper 7, the supply valve 14 and the water plow valve 12 are closed, water is supplied to the supply tank 7 by the water supply pump 9, and the internal gas is discharged downstream through the pressure equalization valve 11. death,
When the supply hopper 7 is filled with water, the pressure equalization valve 11 is closed, and the steel balls from the receiving hopper 5 are resupplied. Lower water tank 1
The steel balls that have been collected by the water supply pump 9 and have completed the soot blowing in the vessel are collected by the water supply pump 9 through the water supply valve 16 and into the collection hopper 15 pressurized with water (through the airtight valve 17). .

When the recovery is completed, the airtight valve 17 is closed again, and the steel balls are transferred to the upper hopper 5 through the recovery valve 18 by the jet pump 19. When the transfer of the steel balls 24 is completed, the recovery hopper 1
5 is again pressurized with water to prepare for re-collection. The steel balls stored in the separation filter n of the upper hot pot 5 are cleaned of soot adhering to the steel balls by water or steam spouted from the nozzle n as necessary, and prepared for circulation again. The water for transferring the steel balls and the water for cleaning the steel ball legs are drained to a circulation water tank through a drain pipe 21 and used for recirculation.

Note that the conveyance of the steel balls by the jet pump 19 in the above embodiment may be replaced by a conveyor system.

The fluid passing through the heat exchange section 3 may be either gas or liquid. As the heat exchanger 2, for example, a gasification furnace, a reaction vessel,
If a gas cooling device such as a combustion device is
By carrying out the present invention, effective soot removal is possible regardless of the gas composition or the amount of soot and dust in the gas.

In addition, when recovering the steel balls U from inside the heat exchanger 2, a steel ball Aikei 5 is installed inside the recovery hopper 13 as necessary to effectively unite the soot and dust in the gas to the gas discharge part 4 side. It is also possible to discharge it to various sources.

FIG. 2 shows another embodiment, in which a steel ball cleaning device n' is installed in a recovery hopper 15' (C. A pneumatic conveying nozzle 19' using steam or air can also be used to convey the steel balls to the receiving hopper 5.

The rest of the structure is the same as the embodiment shown in FIG.

In addition, although the steel balls are collected in the lower water tank 13 in Figs. 1 and 2, it is also possible to have a structure in which the lower water tank 13 is not particularly provided, and in this case, the plow water from the supply hopper 7 is directly circulated. Aquarium hebrow. An example of the lower structure in this case is shown in FIG.

In Fig. 3, the steel balls from which soot has been removed in the heat exchange section 3 of the heat exchanger 2 are collected by a filter 8'' that is large enough to only allow the copper balls to pass through, and then filled with water through an airtight valve 17''. The other components are the same as the embodiment shown in FIG. 1.

〔Effect of the invention〕

According to the present invention, the amount of inert gas used of 100 to 300 Nm3/h, which was conventionally required for pressurizing a rock hole, can be reduced to 0, and the amount of make-up water can be reduced to only about 1 mX.

Furthermore, a detoxification device such as a flare stack, which was conventionally necessary for processing purge gas, becomes unnecessary.

Furthermore, the surface of the heat exchange section can be kept clean and good heat exchange characteristics can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of a heat exchanger having a seam cleaning device according to the present invention, FIG. 2 is a schematic diagram of another embodiment of the present invention, and FIG. 3 is a schematic diagram of another embodiment of the present invention. FIG. 4 is a schematic diagram of an example lower structure, and FIG. 4 is a schematic diagram of a conventional device.

Claims (1)

[Claims] A shot supply hopper has valves at the inflow and outflow sections and is installed in communication with the top of the heat exchanger, and a shot supply hopper has valves in the inflow and outflow sections and is installed in communication with the bottom of the heat exchanger. said supply hopper is provided with water supply and discharge means and a shot and water separation filter; said collection hopper is provided with water supply and discharge means; A heat exchanger having a shot cleaning device, characterized in that shot is supplied to the exchanger and gas sealing is performed, and shot is recovered from the heat exchanger and gas sealing is performed by the recovery hopper.