JPS5881493A - Method and apparatus for cleaning gas cooler - Google Patents

Abstract

PURPOSE:To accurately remove adherent deposits in a short time, by maintaining the temperature of water flowing through a cooling water conduit provided in a gas cooler containing naphthalene and tar above 60 deg.C and removing precipitates adherent to the outer surface of the cooling water conduit. CONSTITUTION:In the main body 2 of a cooler, the two sides of each cooling water pipe 4 are connected to cooling water chambers 2f, 2g formed by upper and lower partition plates 2d, 2e and upper and lower buffle plates 2a, 2b respectively, and cooling water such as sea water or plain water is supplied through a supply pipe 4in connected to the lower cooling water chamber 2g at the outlet side of gas. Said water is discharged through a drain pipe 4ou for cooled hot water connected to the upper cooling water chamber 2f at the inlet side of gas, and coke oven gas is indirectly cooled by the cooling water fluidizing in the cooling water pipe 4. The temperature of the cooling water let flow through said cooling water pipe 4 shall be maintained above 60 deg.C so as to remove accumulated adhesive matter on the inner wall of the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cleaning method and apparatus for removing deposits from gas deposited on the outer peripheral surface of a cooling water pipe of a gas cooling device that indirectly cools gas containing naphthalene, tar, etc. with cold water. It is related to.

Gas cooling equipment such as coke oven gas purification membrane! As shown in Fig. 1, coke oven gas is introduced into the cooler body 2 by suction of 1 gas blower and cooled, and naphthalene, tar, etc. in the gas are precipitated and separated, and then the next step is carried out. gas purification equipment.

That is, the cooler main body 2 has a large number of upper and lower baffle plates 2 inside.
A # 2 b are arranged to form a zigzag gas flow path 2c at the top and bottom, a large number of cooling water pipes 4 are arranged in the gas flow path 2cK, and both sides of each of these cooling water pipes 40 are divided into upper and lower partitions. board j
d, 2e, and the cooling water channel 7 holes 2f formed by the upper and lower baffle plates 2m, 2b.

2g, and supply cooling water such as seawater, fresh water, etc. from the supply pipe 4+n connected to 2g to the lower cooling water channels on the gas outlet side, and to the upper cooling water channels on the gas inlet side.
The coke oven gas is indirectly cooled by the flowing cooling water inside the cooling water pipe 4 which is discharged from the cooled hot water discharge pipe 4ou connected to the 2fK.

However, in the indirect cooling, after a long period of time, a large amount of precipitates from the Kf gas on the outer peripheral surface of the cooling water pipe 4 accumulates, reducing the gas cooling ability and losing the effect of removing substances such as naphthalene and tar. As a result, the gas associated with the contained substances is supplied to the next step, which greatly hinders the gas purification operation. As a result, deposits from the gas deposited on the outer circumferential surface of the cooling water pipe 4 must be periodically removed.

Conventionally, the adhering deposits are removed by arranging water sprinklers 5 in a staggered manner in the gas flow path 2c, temporarily stopping the introduction of coke oven gas into the cooler body 2, and removing the above-mentioned deposits in the cooler body 2. In this method, a large amount of hot ammonium water is sprayed onto the outer peripheral surface of the cooling water pipe 4 from the water sprinkler pipe 5 to wash and remove the deposited deposits.

However, in this conventional method, since the cooling water pipes 4 are arranged in a staggered manner, it is difficult to uniformly spray hot ammonium water over the entire outer peripheral surface of each cooling water pipe 4, so that it is difficult to completely clean and remove the attached deposits. Even if coke oven gas cooling is restarted, the original gas cooling capacity cannot be restored, and therefore the limb cleaning cycle has to be gradually shortened, and eventually this cleaning effect is lost. If the cooler body 2 has to be shut down for a long period of time and the operator has to mechanically remove the accumulated deposits from each cooling water pipe 4. In addition to requiring many days (4 to 5 days) and labor, the cooler itself was shut down for a long period of time, which caused a great deal of trouble in coke oven gas purification operations.

On the other hand, due to long-term cooling water flowing through the H wall of the cooling water pipe, a large amount of impurities in the cooling water precipitates and accumulates, significantly reducing the cooling capacity. l$xf4 had to be removed and, in some cases, replacement work was required.

The present invention was made to solve these problems, and its feature is that the water flow temperature of the cooling water pipe of a device that indirectly cools gas containing naphthalene, tar, etc. with cold water is controlled. A method for cleaning a gas cooling device characterized by removing precipitates from nine gases deposited on the outer circumferential surface of the cooling water pipes at 60° C. or higher, and a method for cleaning cooled hot water drain pipes of a plurality of gas cooling devices by valving each of the cooled hot water drain pipes. A cleaning device for a gas cooling device is characterized in that the cleaning device is connected to a cooling water supply pipe through a cooling water supply pipe.

That is, in the present invention, the reason why hot water of 60°C or higher is supplied to the cooling water pipe is that the deposits deposited on the outer circumferential surface of the cooling water pipe are naphthalene tar and the like with a melting point of about 60°C. It is possible to melt and remove in a short time by indirect heating, and also to completely remove deposits deposited on the inner wall of the cooling water pipe. Therefore, if the temperature of the hot water is lower than 60°C, there is no effect of removing deposits deposited on the inner and outer peripheral surfaces.

In addition, as hot water with a temperature of 60°C or higher, it is possible to effectively use heated waste water discharged from operating gas cooling equipment, and also to use water discharged from other facilities such as thermal power plants, steam generators, etc., and cooling equipment. can make effective use of heated wastewater,
It is very advantageous in terms of energy saving and can be cleaned at any time.

In addition, as in one embodiment of the apparatus shown in FIG. 2, when a large number of cooler bodies 2 are arranged in parallel, such as a Zoraimary cooler in a coke gas purification facility, the cooled hot water of each cooler body 2 is A discharge pipe 4ou K valve Vl sV is provided, the outlet side of the valve is connected to the Po/Zo PIC, and the outlet side of this pump P is connected to the cooling water supply pipe 4+11 of each cooler body 2 via the valve V for control. The valve vl,■! by the device 00! , VS, and the scissor supply pipe 41n, and the drive control of the INZO P are preferably performed for the cooler body 2 to be cleaned in accordance with the cleaning order. This device can wash and remove adhering deposits from the inner and outer circumferential surfaces of the cooling water pipes 4 of each cooler main body 2 in a short cycle, constantly maintaining the desired cooling performance, and removing naphthalene from the gas to be cooled. Substantially the entire amount of tar, etc. can be precipitated and recovered, eliminating any hindrance to the next process, and making it possible to greatly reduce the amount of cooling water used.

Examples of the method and apparatus of the present invention will be described below.

This example is applied to a primary cooler in coke oven gas purification equipment.
This shows the situation immediately before cleaning after several months.

0.5 months later, just before cleaning, the introduction of coke oven gas was temporarily stopped and 70°C hot water was poured into the cooling water pipe for 70 tries.
/Hr for 5 hours, the inner and outer circumferential surfaces of the cooling water pipe were observed and found that there was virtually no deposited deposits on both surfaces. After this, coke oven gas was introduced again and operation was started, and the initial conditions shown in Table 1 were reliably obtained. After this confirmation, a cleaning cycle was carried out every 0.5 months, and after 2 years, there were no deposits attached to the inner and outer peripheral surfaces of the cooling water pipes, and the cooling function of the cooling water pipes was stable at a high level, and the amount of seawater used was reduced to the same level as before. 73
, 49.300W compared to oooi/day? /day, resulting in a savings of 23,700 m'/day.

Furthermore, the amount of coke gas + tar containing beef and naphthalene after cooling was virtually non-existent.

As is clear from the above description, the present invention eliminates the need for the operator to clean the cooling water pipes, and makes effective use of hot water discharged from the operating gas cooling device or other cooling equipment, so that it can be easily cleaned at any time. This equipment cleans the circumferential surface of the inner pile of the cooling water pipe of the gas cooling system, and reliably removes the accumulated deposits on the same surface in a short period of time, restoring the desired gas cooling performance. This makes it possible to supply gas with desired properties to the next process of the gas cooling device, allowing continuous and smooth gas processing operations, and also greatly reducing the amount of water supplied to the cooling water pipes, etc. In addition to the above-mentioned effective use of heated wastewater, it has an extremely large energy saving effect, and also has extremely excellent industrial effects.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an example of a gas cooling device to which the present invention is applied, and FIG. 2 is a schematic explanatory diagram showing one embodiment of the device according to the present invention. In the figure, l: gas blower, 2: cooler body, 4: cooling water pipe h
41n: Cooling water supply pipe, 4ou: Cooled hot water discharge pipe, VB, Vl, Vs, V4: Opening/closing valve %P://zo*Oo: Control device agent Patent attorney Masanobu Akisawa 2 people

Claims (4)

[Claims] (1) In a device that indirectly cools gas containing naphthalene, tar, etc. with cold water, the water flow temperature of the cooling water pipe is set to 60°C or higher to remove deposits from the gas that have adhered and accumulated on the outer peripheral surface of the cooling water pipe. A method for cleaning a gas cooling device, characterized by: (2) Gas cooling according to claim 1, characterized in that heated waste water from one gas cooling device is supplied to a cold water pipe of the other gas cooling device to clean the other gas cooling device. How to clean the equipment. (3) A method for cleaning a gas cooling device according to claim 1, characterized in that heated waste water from a cooling device discharged from a thermal power plant, a steam generator, etc. is supplied to the cold water pipe. . (4) A cleaning device for a gas cooling device, characterized in that cooled hot water drain pipes of a plurality of gas cooling devices are each connected to a cooling water supply pipe via a valve.