Primary cooler cleaning device and method

Abstract

The present invention relates to a heat exchanger cleaning device in coking production, and in particular to a pre-cooler cleaning device and method. It includes a heating system, a pre-cooler water seal tank, a cleaning liquid storage tank, a feed pump and a spraying system; the heating system is for heating water to be introduced into the heat exchange tube, and the heating system is fixedly connected to the pre-cooler body in sections from top to bottom, the pre-cooler body is connected to the pre-cooler water seal tank through a pipeline, the pre-cooler water seal tank is connected to the cleaning liquid storage tank through a pipeline, the cleaning liquid storage tank is connected to the feed pump through a pipeline, the feed pump is connected to the spraying system through a pipeline, and the spraying pipe of the spraying system enters the pre-cooler body horizontally, the spraying pipe is located above the heating system, the nozzle is fixedly connected to the spraying pipe, and the spraying direction is downward. It can clean the coal powder, tar, naphthalene and other sediments in the pre-cooler, with obvious effect, thorough cleaning, low investment, low cost, and the cleaning liquid can be recycled after cleaning.

Description

Technical Field

[0001] The invention relates to a heat exchanger cleaning device in coking production, and in particular to a primary cooler cleaning device and method. Background Art

[0002] The primary cooler is a key equipment in the coking plant. It is a primary cooling device for coke oven gas that cools and purifies coal gas and reduces the volume of coal gas. The primary cooler is used to cool raw coal gas. After a period of use, impurities such as coal powder, tar, naphthalene, etc. in the raw coal gas are deposited on the heat exchange tubes of the primary cooler, causing the resistance of the primary cooler to increase. Steam cleaning, hot ammonia cleaning, hot gas cleaning, hot washing oil and other methods are usually used. The high temperature during steam cleaning hardens part of the tar attached to the outer wall of the heat exchange tube, increasing the difficulty of cleaning. Due to the implementation of negative pressure coal loading technology, a large amount of coal powder enters the interior of the primary cooler, and traditional cleaning methods are difficult to achieve significant results. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a pre-cooler cleaning device and method, which can clean coal powder, tar, naphthalene and other sediments in the pre-cooler, with obvious effect, thorough cleaning, low investment and low cost, and the cleaning liquid can be recycled after cleaning.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A pre-cooler cleaning device comprises a heating system, a pre-cooler water seal tank, a cleaning liquid storage tank, a feed pump and a spraying system; the heating system is for introducing heating water into the heat exchange tube, the heating system is fixedly connected to the pre-cooler body in sections from top to bottom, the pre-cooler body is connected to the pre-cooler water seal tank through a pipeline, the pre-cooler water seal tank is connected to the cleaning liquid storage tank through a pipeline, the cleaning liquid storage tank is connected to the feed pump through a pipeline, the feed pump is connected to the spraying system through a pipeline, the spraying pipe of the spraying system enters the pre-cooler body horizontally, the spraying pipe is located above the heating system, the nozzle is fixedly connected to the spraying pipe, and the spraying direction is downward.

[0006] The cleaning liquid storage tank is a vertical cone-top tank or a horizontal tank, with a benzene inlet and a washing oil inlet provided on the side wall of the body, a vertical partition provided at the bottom of the body, and the cleaning liquid storage tank is connected to the tar ammonia water separation tank through a pipeline.

[0007] The heating system has heating water introduced into each section from top to bottom respectively or all from top to bottom, and the heating water is heating water for the primary cooler.

[0008] The feed pump is connected to the crude benzene unit regenerator through a pipeline.

[0009] A method for cleaning a primary cooler comprises the following steps:

[0010] 1) First, close the gas inlet and outlet valves and replace the internal gas. Let the heating water from other running primary coolers flow into the heat exchange tubes. Let the heating water flow into each section from top to bottom, or let the heating water flow into each section from top to bottom, heat the sediment on the outside of the heat exchange tubes, and then clean them with cleaning fluid after heating.

[0011] 2) Washing oil and crude benzene from the oil depot section enter one side of the partition of the cleaning liquid storage tank through the benzene inlet and the washing oil inlet, and the cleaning liquid is pumped to the spraying system through the feed pump for cyclic spraying; during cleaning, the cleaning liquid first enters the heating water section of the pre-cooler, and the heating water is introduced into the heat exchange tube to heat the sediment outside the heat exchange tube, which contains a mixture of tar and naphthalene. During the cleaning liquid washing process, it flows downward and flows into the pre-cooler water seal tank from the spraying liquid outlet at the pre-cooler liquid cut-off plate, and finally flows into the other side of the cleaning liquid storage tank partition, wherein part of the cleaning liquid flows through the partition to the other side of the partition, and together with the replenished cleaning liquid, it is cyclically sprayed;

[0012] 3) After the heating section and the circulating water section are cleaned, the low-temperature water section is cleaned in turn. The liquid flows from the spraying liquid outlet at the bottom of the primary cooler into the primary cooler water seal tank, and finally flows into the other side of the partition of the cleaning liquid storage tank. Part of the cleaning liquid flows through the partition to the other side of the partition, and is sprayed together with the supplementary cleaning liquid in a cycle;

[0013] 4) After cleaning is completed, the cleaning liquid side in the cleaning liquid storage tank enters the debenzene section regenerator through the feed pump, and the mixture containing tar and naphthalene on the other side of the partition is sent to the tar ammonia separation tank.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1) The original spraying system can be used by adding a cleaning liquid storage tank, which requires little investment.

[0016] 2) Washing oil and benzene are products of the coking plant and can be recycled after cleaning. They do not need to be purchased from outside and no waste liquid is generated.

[0017] 3) The heating water used is the heating water of the primary cooler and does not need to be purchased from outside.

[0018] The invention can clean the coal powder, tar, naphthalene and other sediments in the primary cooler, has obvious effect, cleans thoroughly, requires little investment, has low cost, and the cleaning liquid can be recycled after cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure and process principle of the present invention.

[0020] In the figure: 1- cleaning liquid storage tank 2- feed pump 3- heating system 4- primary cooler body 5- primary cooler water seal tank 6- partition DETAILED DESCRIPTION

[0021] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0022] Example:

[0023] like Figure 1 As shown, a pre-cooler cleaning device includes a heating system 3, a pre-cooler water seal tank 5, a cleaning liquid storage tank 1, a feed pump 2 and a spraying system.

[0024] The heating system 3 is a heat exchange tube into which heating water is introduced. The heating system 3 is divided into three sections from top to bottom and fixedly connected to the primary cooler body 4. The heating system is connected to heating water in each section from top to bottom separately or together from top to bottom. The heating water is the primary cooler heating water.

[0025] The cleaning liquid storage tank 1 is a vertical cone-top tank or a horizontal tank. The side walls of the cleaning liquid storage tank 1 are respectively provided with a benzene inlet and a washing oil inlet. The cleaning liquid in the cleaning liquid storage tank 1 is a mixture of washing oil and benzene. A vertical partition 6 is provided at the bottom of the cleaning liquid storage tank 1. The cleaning liquid storage tank 1 is connected to the tar ammonia water separation tank through a pipeline. The storage tank volume is determined according to the amount of cleaning liquid. Washing oil and benzene are introduced into the tank and mixed as cleaning liquid, and washing oil and benzene can be supplemented.

[0026] The cleaning liquid storage tank 1 also serves as a cleaning liquid receiving tank, with a partition 6 at the bottom. Part of the cleaning liquid containing impurities such as coal powder, tar, naphthalene, etc. is sent to the tar ammonia separation tank. After cleaning, the washing oil and benzene mixture is sent to the crude benzene unit regenerator for regeneration.

[0027] The pre-cooler body 4 is connected to the pre-cooler water seal tank 5 through a pipeline, the pre-cooler water seal tank 5 is connected to the cleaning liquid storage tank 1 through a pipeline, the cleaning liquid storage tank 1 is connected to the feed pump 2 through a pipeline, the feed pump 2 is connected to the spraying system through a pipeline, and the feed pump 2 is connected to the crude benzene unit regenerator through a pipeline.

[0028] The spray pipe of the spray system enters into the primary cooler body 4 horizontally, the spray pipe is located above the heating system 3, the spray head is fixed on the spray pipe, and the spraying direction is downward.

[0029] A method for cleaning a primary cooler comprises the following steps:

[0030] 1) First, close the gas inlet and outlet valves and replace the internal gas. Let the heating water from other running pre-coolers flow into the heat exchange tubes. Let the heating water flow into each section from top to bottom separately, or let the heating water flow into them from top to bottom together, heat the sediment on the outside of the heat exchange tubes, and then clean them with cleaning fluid after heating. Let the heating water flow into each section from top to bottom separately, or let the heating water flow into them from top to bottom together.

[0031] 2) The washing oil and crude benzene from the oil depot section enter one side of the partition 6 of the cleaning liquid storage tank 1 through the benzene inlet and the washing oil inlet, and the cleaning liquid is sent to the spraying system through the feed pump 2 for cyclic spraying; when cleaning, the cleaning liquid first enters the heating water section of the pre-cooler, and the heating water is introduced into the inside of the heat exchange tube to heat the sediment outside the heat exchange tube, which contains a mixture of tar and naphthalene. During the cleaning liquid washing process, it flows downward and flows into the pre-cooler water seal tank 5 from the spray liquid outlet at the pre-cooler liquid cut-off plate, and finally flows into the other side of the partition 6 of the cleaning liquid storage tank 1, wherein part of the cleaning liquid flows through the partition 6 to the other side of the partition 3, and together with the replenished cleaning liquid, it is cyclically sprayed.

[0032] 3) After the heating section and the circulating water section are cleaned, the low-temperature water section is cleaned in turn, and the liquid flows from the spraying liquid outlet at the bottom of the primary cooler into the primary cooler water seal tank 5, and finally flows into the other side of the partition 6 of the cleaning liquid storage tank 1. Part of the cleaning liquid flows through the partition 6 to the other side of the partition 6, and is sprayed together with the supplementary cleaning liquid in a cycle;

[0033] 4) After cleaning is completed, the cleaning liquid side in the cleaning liquid storage tank 1 enters the debenzene section regenerator through the feed pump, and the mixture containing tar and naphthalene on the other side of the partition 6 is sent to the tar ammonia separation tank.

[0034] The present invention can utilize the original spraying system and only need to add a cleaning liquid storage tank 1, which requires little investment. Washing oil and benzene are products of the coking plant and can be recovered after cleaning, so they do not need to be purchased from outside, and no waste liquid is generated. The heating water used for heating is the heating water of the primary cooler, which does not need to be purchased from outside.

[0035] The invention can clean the coal powder, tar, naphthalene and other sediments in the primary cooler, has obvious effect, cleans thoroughly, requires little investment, has low cost, and the cleaning liquid can be recycled after cleaning.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for cleaning a primary cooler, characterized in that: The device used includes a heating system, a pre-cooler water seal tank, a cleaning liquid storage tank, a feed pump and a spraying system; the heating system is a heat exchange tube into which heating water is introduced, the heating system is fixedly connected to the pre-cooler body in sections from top to bottom, the pre-cooler body is connected to the pre-cooler water seal tank through a pipeline, the pre-cooler water seal tank is connected to the cleaning liquid storage tank through a pipeline, the cleaning liquid storage tank is connected to the feed pump through a pipeline, the feed pump is connected to the spraying system through a pipeline, the spraying pipe of the spraying system enters the pre-cooler body horizontally, the spraying pipe is located above the heating system, the nozzle is fixedly connected to the spraying pipe, and the spraying direction is downward; The cleaning liquid storage tank is a vertical cone-top tank or a horizontal tank, with a benzene inlet and a washing oil inlet provided on the side wall of the body, and a vertical partition provided at the bottom of the body. The cleaning liquid storage tank is connected to the tar-ammonia separation tank through a pipeline; The heating system is introduced into each section from top to bottom respectively or into heating water from top to bottom together, and the heating water is the heating water of the primary cooler; The feed pump is connected to the crude benzene unit regenerator through a pipeline; The specific steps include: 1) First, close the gas inlet and outlet valves and replace the internal gas. Let the heating water from other running primary coolers flow into the heat exchange tubes. Let the heating water flow into each section from top to bottom, or let the heating water flow into each section from top to bottom, heat the sediment on the outside of the heat exchange tubes, and then clean them with cleaning fluid after heating. 2) Washing oil and crude benzene from the oil depot section enter one side of the partition of the cleaning liquid storage tank through the benzene inlet and the washing oil inlet, and the cleaning liquid is pumped to the spraying system through the feed pump for cyclic spraying; during cleaning, the cleaning liquid first enters the heating water section of the pre-cooler, and the heating water is introduced into the heat exchange tube to heat the sediment outside the heat exchange tube, which contains a mixture of tar and naphthalene. During the cleaning liquid washing process, it flows downward and flows into the pre-cooler water seal tank from the spraying liquid outlet at the pre-cooler liquid cut-off plate, and finally flows into the other side of the cleaning liquid storage tank partition, wherein part of the cleaning liquid flows through the partition to the other side of the partition, and together with the replenished cleaning liquid, it is cyclically sprayed; 3) After the heating section and the circulating water section are cleaned, the low-temperature water section is cleaned in turn. The liquid flows from the spraying liquid outlet at the bottom of the primary cooler into the primary cooler water seal tank, and finally flows into the other side of the partition of the cleaning liquid storage tank. Part of the cleaning liquid flows through the partition to the other side of the partition, and is sprayed together with the supplementary cleaning liquid in a cycle; 4) After cleaning is completed, the cleaning liquid side in the cleaning liquid storage tank enters the debenzene section regenerator through the feed pump, and the mixture containing tar and naphthalene on the other side of the partition is sent to the tar ammonia separation tank.

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