CN211178120U

CN211178120U - Online cleaning device for ammonia still heat exchanger

Info

Publication number: CN211178120U
Application number: CN201921775908.4U
Authority: CN
Inventors: 王海涛; 任丽霞; 王大鹏; 刘江涛; 李昕
Original assignee: Linhuan Coking and Chemical Co Ltd
Current assignee: Linhuan Coking and Chemical Co Ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-08-04
Anticipated expiration: 2029-10-22

Abstract

The utility model discloses an evaporate ammonia heat exchanger online cleaning device belongs to coal coking production field, including lean oil pump, debenzolization tower, one section lean oil cooler, regenerator and residue groove, the debenzolization tower passes through the pipeline and is connected with the lean oil pump, and the lean oil pump passes through the pipeline and is connected with one section lean oil cooler, and one section lean oil cooler passes through the pipeline and is connected with two-section lean oil cooler, and the lean oil pump passes through the pipeline and is connected with evaporating ammonia heat exchanger, and evaporating ammonia heat exchanger passes through the pipeline and is connected with the regenerator, and the regenerator passes through the pipeline and is connected with the residue groove. The utility model discloses an ammonia still heat exchanger on-line cleaning device utilizes hot lean oil under inclosed condition, carries out abundant dissolution, washing to the inside tar deposit of heat exchanger to satisfy normal heat transfer requirement. The tar deposits on the inner wall of the ammonia distillation heat exchanger are washed off by utilizing the hot lean oil under the condition of complete sealing, no wastewater is generated, and the washed deposits firstly enter a regenerator for oil washing regeneration, so that the oil washing quality is not influenced.

Description

Online cleaning device for ammonia still heat exchanger

Technical Field

The utility model relates to a coal coking production field, specifically speaking, the utility model relates to an ammonia still heat exchanger online cleaning device.

Background

The ammonia distillation heat exchanger comprises an ammonia water heat exchanger and a waste water cooler. The residual ammonia water at about 70 ℃ generated by the drum cooling section contains a certain amount of light tar. Therefore, no matter the residual ammonia water or the ammonia evaporation wastewater passes through the heat exchanger, tar substances are continuously deposited on the inner wall of the heat exchanger, so that the resistance of the heat exchanger is continuously increased, and the heat exchange effect is increasingly poor. From this vicious circle, finally influence the normal processing of remaining aqueous ammonia, cause the remaining aqueous ammonia groove of drum-cooling to rise liquid, form environmental protection hidden danger.

If the ammonia distillation heat exchanger is directly replaced, a certain purchase period is needed, and the cost is higher. The most effective method is to wash away the deposits on the inner wall of the heat exchanger and the attached tube wall by using a solvent. In the past, the heat exchanger is swept by steam, sediment cannot be blown cleanly, and site noise is high. Early heat exchanger cleaning companies also used carbon tetrachloride for cleaning, but this method was expensive and the resulting waste liquid was difficult to dispose of. Since carbon tetrachloride is a colorless toxic liquid, the use of carbon tetrachloride has been strictly limited by the country, only for the use of raw materials for non-ozone depleting substances and for special uses. Finally, by combining the current situation of coking production and through strict demonstration and test, the heat exchanger is cleaned by adopting hot lean oil at about 180 ℃, so that the method is easy to operate, low in cost, environment-friendly and effective.

Disclosure of Invention

The utility model aims to solve the technical problem that a heat exchanger is washd under airtight environment is provided, does not produce the waste liquid, can not cause the solvent to volatilize and the ammonia still heat exchanger on-line cleaning device of polluted environment.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides an ammonia still heat exchanger online cleaning device, includes lean oil pump, debenzolization tower, one section lean oil cooler, two-stage segment lean oil cooler, ammonia still heat exchanger, regenerator and residue groove, the debenzolization tower passes through the pipeline and is connected with the lean oil pump, and the lean oil pump passes through the pipeline and is connected with one section lean oil cooler, and one section lean oil cooler passes through the pipeline and is connected with two-stage segment lean oil cooler, and the lean oil pump passes through the pipeline and is connected with the ammonia still heat exchanger, and the ammonia still heat exchanger passes through the pipeline and is connected with the regenerator, and the regenerator passes through the pipeline and is connected with the residue groove.

Adopt the technical scheme of the utility model, can obtain following beneficial effect:

the utility model discloses an ammonia still heat exchanger on-line cleaning device utilizes hot lean oil under inclosed condition, carries out abundant dissolution, washing to the inside tar deposit of heat exchanger to satisfy normal heat transfer requirement. The tar deposits on the inner wall of the ammonia distillation heat exchanger are washed off by utilizing the hot lean oil under the condition of complete sealing, no wastewater is generated, and the washed deposits firstly enter a regenerator for oil washing regeneration, so that the oil washing quality is not influenced.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIG. 1 is a schematic structural view of the apparatus;

the labels in the above figures are: 1. a debenzolization tower; 2. a lean oil pump; 3. a first-stage lean oil cooler; 4. a second-stage lean oil cooler; 5. an ammonia still heat exchanger; 6. a regenerator; 7. a residue tank.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, in which the shapes, structures, mutual positions and connection relationships of the respective members, the functions of the respective portions, the operation principles, and the like of the respective members are described.

As shown in figure 1, the online cleaning device for the ammonia distillation heat exchanger comprises a lean oil pump 2, a debenzolization tower 1, a first-section lean oil cooler 3, a second-section lean oil cooler 4, an ammonia distillation heat exchanger 5, a regenerator 6 and a residue tank 7, wherein the debenzolization tower 1 is connected with the lean oil pump 2 through a pipeline, the lean oil pump 2 is connected with the first-section lean oil cooler 3 through a pipeline, the first-section lean oil cooler 3 is connected with the second-section lean oil cooler 4 through a pipeline, the lean oil pump 2 is connected with the ammonia distillation heat exchanger 5 through a pipeline, the ammonia distillation heat exchanger 5 is connected with the regenerator 6 through a pipeline, and the regenerator 6 is connected with the residue tank 7 through a pipeline.

When in use, the outlet pipeline branch of the lean oil pump 2 is connected with the inlet of the ammonia still heat exchanger 5, and the outlet pipe of the ammonia still heat exchanger 5 is connected to the upper part of the oil inlet pipe of the regenerator 6. The hot lean oil at about 180 ℃ continuously flows through the ammonia still heat exchanger 5 at the flow rate of 10t/h and enters the regenerator 6 for washing oil regeneration. After the regenerated washing oil, the effective components are continuously recycled in the crude benzene system, and the heavy components enter a residue tank 7 through a residue discharge system of a regenerator 6. In the whole cleaning process, the ammonia distillation heat exchanger 5 is cleaned, and the deterioration of the washing oil is avoided. The residue can also be sold as a product.

According to the method, the hot lean oil carried by the crude benzene system is utilized, and an outsourcing cleaning agent is not needed, so that the cleaning work of the ammonia distillation heat exchanger 5 can be completed under a closed condition. After the ammonia distillation heat exchanger 5 is cleaned, the cleaning solution is firstly sent to the regenerator 6 for oil washing regeneration, so that the quality of the oil washing of the crude benzene system is not reduced. And the regenerated cleaning liquid is discharged from the bottom of the regenerator 6, then is sent to a residue tank 7, and is sent to a large tar tank of the oil depot through a residue pump to be sold as a product. Compared with organic cleaning agents such as carbon tetrachloride and the like, the cleaning agent not only saves cost, but also does not generate waste liquid, and the cleaned substances can be sold as products.

An ammonia still heat exchanger on-line cleaning method, this method utilizes hot lean oil of about 180 duC, wash the tar type deposit of the inner wall of ammonia still heat exchanger under the totally enclosed situation, enter the regenerator 6 and wash the oil regeneration, guarantee the viscosity of circulating wash oil does not increase. And discharging the regenerated residues into a residue tank, and pumping the residues to a large tar tank of the oil depot. The method fully utilizes the waste heat of the hot lean oil from the bottom of the debenzolization tower 1, and adds a pipeline from the outlet of the lean oil pump to be connected to the inlet pipe of the ammonia still heat exchanger 5. The hot lean oil passes through an ammonia still heat exchanger 5 and is sent to a regenerator 6 through an outlet pipe for washing oil and regenerating. The whole cleaning process of the heat exchanger is in a closed state, and no waste liquid is generated. The washed deposits are regenerated at high temperature by the regenerator, so that the quality of the circulating wash oil is ensured. The slag discharged from the bottom of the regenerator 6 is directly sent to a residue tank 7, and is sent to a tar tank through a residue pump to be sold as a tar product; the process utilizes the washing oil used in the crude benzene production, and does not need to purchase a special cleaning agent additionally. The method has the advantages of no influence on normal production operation in the process of cleaning the heat exchanger, cost saving, safety, reliability and simple and convenient operation.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, and various insubstantial improvements can be made without modification to the method and technical solution of the present invention, or the present invention can be directly applied to other occasions without modification, all within the scope of the present invention.

Claims

1. The utility model provides an ammonia still heat exchanger online cleaning device which characterized in that: the system comprises a lean oil pump, a debenzolization tower, a first-section lean oil cooler, a second-section lean oil cooler, an ammonia evaporation heat exchanger, a regenerator and a residue tank, wherein the debenzolization tower is connected with a lean oil pump through a pipeline, the lean oil pump is connected with the first-section lean oil cooler through a pipeline, the first-section lean oil cooler is connected with the second-section lean oil cooler through a pipeline, the lean oil pump is connected with the ammonia evaporation heat exchanger through a pipeline, the ammonia evaporation heat exchanger is connected with the regenerator through a pipeline, and the regenerator is connected with the residue tank through a pipeline.