Naphthalene slag washing and discharging system of coking primary cooler
By installing a baffle plate and a slag discharge pump system in the coking primary cooler, the problem of the difficulty in discharging the mixture of naphthalene residue and tar was solved, resulting in better cooling effect and energy consumption optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 河南利源新能科技有限公司
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-21
AI Technical Summary
In existing coking primary coolers, the mixture of naphthalene residue and tar is difficult to effectively discharge, leading to the accumulation of impurities and affecting the operating efficiency and energy consumption of the primary cooler.
Guide plates are installed at the bottom of the upper and lower condensate tanks and connected to the slag discharge pump through the discharge pipe. The guide plates are arc-shaped to facilitate the discharge of impurities. The slag discharge pump is connected to the tar-ammonia-water separation process.
This achieved effective discharge of naphthalene residue and tar, reduced the resistance of the primary cooler, improved the cooling effect, reduced energy consumption, improved gas temperature, and enhanced system stability.
Smart Images
Figure CN224148000U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to coking equipment, and in particular to a naphthalene residue discharge system for a coking primary cooler, belonging to the technical field of coking equipment. Background Technology
[0002] In the processing of raw coal gas from coking plants, the gas first enters the primary cooler for cooling. The primary cooler is the first piece of equipment for removing impurities from the coal gas, and its operation directly affects the operation of subsequent processes. In existing horizontal tube primary coolers, the coal gas flows from top to bottom through the tubes (shell side); the cooling medium is located in the tube side. Each primary cooler is divided into three sections to cool the coal gas. The first section has a temperature of about 70 degrees Celsius and uses waste water for cooling; the second section (hereinafter referred to as the upper section) has a temperature of about 40 degrees Celsius and uses circulating water for cooling; and the third section (hereinafter referred to as the lower section) has a temperature above 23 degrees Celsius and uses low-temperature water for cooling. Finally, after the coal gas is cooled to below 23 degrees Celsius, it exits the primary cooler from the bottom. Because the temperatures in the upper and lower sections are relatively low, water, tar, and naphthalene condense and precipitate as the gas is cooled in these sections of the horizontal tube primary cooler. Therefore, a tar-ammonia-water mixture needs to be continuously sprayed into the space between the upper and lower tubes to wash away the naphthalene deposits on the tube walls, ensuring the purification and cooling effect of the gas. A hot ammonia-water flushing pipe is installed at the top of the horizontal tube primary cooler for periodic spraying and flushing. During the gas cooling process, condensate is generated in the upper section of the horizontal tube primary cooler and discharged through the broken tray between the upper and lower sections. The outlet splits into two paths, which can respectively enter the upper condensate tank and the tar-ammonia-water separation process. The upper condensate pump draws the solution from the upper condensate tank and sends it to the upper section of the horizontal tube primary cooler for spraying. The condensate discharged from the lower section of the horizontal tube primary cooler enters the lower condensate tank. Both the upper and lower condensate tanks are installed at the same ground level. A connecting pipe with a valve is installed between the upper and lower condensate tanks. The lower condensate pump draws solution from the lower condensate tank and sends it to the lower section of the horizontal tube primary cooler for spraying. Simultaneously, a hot ammonia water flushing pipe is connected to the lower spraying pipe, allowing for switching between flushing processes. Excess solution is pumped to the tar-ammonia separation process via the lower condensate pump. The lower condensate is replenished with emulsion from the tar-ammonia separation process. The condensate contains a mixture of naphthalene residue and tar. In the past, the production process of the compound relied on the discharge of condensate flowing into the tar-ammonia separation process (where the naphthalene washing liquid is circulated and discharged via a naphthalene discharge pump). Therefore, in order to remove slag, a portion of the condensate must be discharged. However, since the condensate from the tar-ammonia separation process is only a portion of the condensate, the removal effect of the naphthalene residue and tar mixture is not good. These naphthalene residue and tar mixture impurities cannot be discharged from the bottom of the tank, which will cause the impurities to enter the primary cooler washing system and adhere to the inside of the primary cooler. This will increase the gas resistance of the primary cooler, result in poor heat exchange effect, and cause waste of system energy and production fluctuations. Summary of the Invention
[0003] The purpose of this invention is to overcome the above-mentioned problems in the cooling of the primary cooler and to provide a system for discharging naphthalene washing residue from the coking primary cooler.
[0004] To achieve the purpose of this utility model, the following technical solution is adopted: a coking primary cooler naphthalene washing residue external discharge system, including an upper condensate tank and a lower condensate tank, with discharge pipes connected to the bottom of both the upper and lower condensate tanks. The discharge pipes are connected to a discharge main pipe, which is connected to the inlet of a slag discharge pump, and the outlet of the slag discharge pump is connected to the tar ammonia water separation process.
[0005] Furthermore, the discharge pipes on the upper condensate tank and the lower condensate tank are both connected near the middle in the length direction.
[0006] Furthermore, guide plates are fixedly connected to both the upper and lower condensate tanks, with the guide plates located above the discharge pipe.
[0007] Furthermore, the guide plate is arc-shaped, with the convex side of the arc facing upwards.
[0008] The positive and beneficial technical effects of this utility model are as follows: Compared with the traditional process, this system can better discharge the naphthalene residue and tar mixture and achieve a better cooling effect. The specific implementation method will be described in detail. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the length direction of this system.
[0010] Figure 2 This is a side view of the internal air deflector. Detailed Implementation
[0011] To more fully explain the implementation of this utility model, implementation examples are provided. These implementation examples are merely illustrative of this utility model and do not limit its scope.
[0012] The present invention will be further explained in detail with reference to the accompanying drawings, in which the following references are made: 1: upper condensate tank; 2: lower condensate tank; 3: first discharge pipe; 4: second discharge pipe; 5: main discharge pipe; 6: first guide plate; 7: second guide plate; 8: slag pump.
[0013] As shown in the attached diagram, a coking primary cooler naphthalene washing residue discharge system includes an upper condensate tank 1 and a lower condensate tank 2. Both the existing upper and lower condensate tanks have manholes for maintenance. Discharge pipes are connected to the bottom of both tanks, and these pipes are located near the middle of their length. In the diagram, the first discharge pipe 3 is for the upper condensate tank, and the second discharge pipe 4 is for the lower condensate tank. Both pipes are connected to a main discharge pipe 6, which is connected to the inlet of a slag discharge pump 8. The outlet of the slag discharge pump is connected to the tar-ammonia-water separation process. Guide plates are fixedly connected inside both the upper and lower condensate tanks, positioned above the discharge pipes. Furthermore, the guide plates are arc-shaped, with the convex surface facing upwards. In the diagram, the first guide plate 6 is the guide plate in the upper condensate tank, and the second guide plate 7 is the guide plate in the lower condensate tank. The guide plates allow surrounding liquid to flow into the discharge pipe from the side, resulting in a higher slag content during extraction. The arc shape helps to flush down impurities deposited on the arc-shaped plate, preventing impurities from accumulating on the guide plate. The guide plates can be fixedly installed in the upper condensate tank 1 and the lower condensate tank 2 through manholes.
[0014] After adopting this system, the resistance of the original primary cooler was reduced from 1200pa to 600pa; the slag discharge pump replaced the original naphthalene discharge pump in the lower section. Since there was no external discharge flow from the naphthalene discharge pump, the spray flow rate in the lower section of the primary cooler increased from 110m³ / h per primary cooler to 140m³ / h, reducing the circulating water volume and low-temperature water volume by 100m³ / h each; due to the better slag discharge effect of this system, the impurity content in the condensate will be greatly reduced, and the naphthalene removal effect produced by the condensate spray will also increase. The gas temperature after the primary cooler improved from 23℃ to 20℃, and the overall naphthalene removal effect of the primary cooler gas was significant.
[0015] After a detailed description of the embodiments of this utility model, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent applications. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the technical solution of this utility model, and this utility model is not limited to the embodiments of the examples given in the specification.
Claims
1. A system for discharging naphthalene residue from a coking primary cooler, comprising an upper condensate tank and a lower condensate tank, characterized in that: Both the upper and lower condensate tanks are connected to discharge pipes at their bottoms. The discharge pipes are connected to the main discharge pipe, which is connected to the inlet of the slag pump. The outlet of the slag pump is connected to the tar-ammonia-water separation process.
2. A naphthalene washings discharge system of a coking primary cooler according to claim 1, characterized in that: The upper condensate tank and the lower condensate discharge pipe are both connected near the middle in the length direction.
3. A naphthalene washings discharge system of a coking primary cooler according to claim 1, characterized in that: Guide plates are fixedly connected to both the upper and lower condensate tanks, and the guide plates are located above the discharge pipe.
4. The naphthalene washings discharge system of the coking primary cooler according to claim 3, characterized in that: The guide plate is arc-shaped, with the convex side facing upwards.