Ammonia water flushing device for primary cooler

Abstract

The utility model discloses an ammonia water flushing device for a primary cooler, which comprises an upper-section differential pressure transmitter, a middle-section differential pressure transmitter, a lower-section differential pressure transmitter, an ammonia water heating temperature controller, an ammonia water heating regulating valve, an ammonia water heater and a transverse pipe primary cooler, the ammonia water heating temperature controller, the ammonia water heating regulating valve and the ammonia water heater are connected through a pipeline; the ammonia water heating temperature controller is connected with a spraying opening of the transverse pipe primary cooler through a pipeline; the horizontal pipe primary cooler sequentially comprises a waste heat water cooling section, a circulating water cooling section and a low-temperature water cooling section from top to bottom; an upper-section differential pressure transmitter is arranged on the waste heat water cooling section; a middle-section differential pressure transmitter is arranged on the circulating water cooling section; and a lower-section differential pressure transmitter is arranged on the low-temperature water cooling section. Hot ammonia water can be prevented from being cooled by circulating water in the tube pass of the primary cooler, so that the flushing effect of the primary cooler is ensured, and the primary cooler can quickly reach a standby state.

Description

Technical Field

[0001] This utility model relates to the technical field of coke oven gas purification and treatment, and in particular to an ammonia water flushing device for a primary cooler. Background Technology

[0002] The raw coal gas produced during coke oven production is cooled by a horizontal tube primary cooler, which removes the tar and naphthalene. The condensed tar, after separation, can be sold as a product. During the cooling process, the condensate produced in the upper section accounts for approximately 80% of the total condensate, with tar making up 60% of the condensate's mass; the naphthalene cooled in the lower section accounts for approximately 60% of the condensate's mass. During this process, the tar and naphthalene accumulate on the walls of the cooling water pipes, requiring continuous spraying with a spraying liquid to dissolve them, ensuring efficient heat exchange and keeping the equipment resistance within warning limits.

[0003] As the operating time of the primary cooler increases, or if the composition of the spray fluid changes, the resistance of the primary cooler will rise. When the resistance reaches the alarm value of the primary cooler, it needs to be replaced. After replacement, the primary cooler no longer receives gas. By switching the spray fluid to hot ammonia water, the deposits accumulated on the pipe walls can be flushed off. Through continuous flushing with high-temperature ammonia water, the primary cooler can quickly reach standby status.

[0004] However, in traditional processes, to ensure the flushing effect of hot ammonia water and prevent its temperature from dropping, the circulating water and low-temperature water in the primary cooler tubes that have been switched out need to be drained. This results in poor flushing performance of the primary cooler, making it impossible to quickly reach standby status. Furthermore, because the hot ammonia water from the tar-ammonia separation process utilizes different waste heat sources, its temperature becomes inconsistent (e.g., using both riser waste heat and circulating ammonia waste heat, or using only circulating ammonia waste heat, both of which cause the ammonia water temperature to drop below 70°C). This further contributes to poor flushing performance of the primary cooler, preventing it from quickly reaching standby status.

[0005] In order to enable rapid standby of the primary cooler, some coking plants use direct steam purging to dissolve the tar and naphthalene accumulated on the tube wall. However, this practice causes significant damage to the primary cooler, which is in a state of periodic heating, thus reducing its service life.

[0006] Therefore, a flushing device is urgently needed to ensure the flushing effect of the primary cooler and enable it to quickly reach standby status. Utility Model Content

[0007] The purpose of this invention is to provide an ammonia flushing device for a primary cooler, which can prevent hot ammonia from being cooled by the circulating water in the tubes of the primary cooler, thereby ensuring the flushing effect of the primary cooler and enabling it to quickly reach standby status.

[0008] To achieve the above objectives, this utility model provides the following solution:

[0009] This utility model discloses an ammonia flushing device for a primary cooler, comprising:

[0010] Upper differential pressure transmitter, middle differential pressure transmitter, lower differential pressure transmitter, ammonia heating temperature control, ammonia heating regulating valve, ammonia heater and horizontal tube primary cooler;

[0011] The ammonia water heating temperature control, ammonia water heating regulating valve, and ammonia water heater are connected by pipes;

[0012] The ammonia water heating temperature control is connected to the spray port of the horizontal tube primary cooler via a pipeline.

[0013] The horizontal tube primary cooler comprises, from top to bottom, a waste hot water cooling section, a circulating water cooling section, and a low-temperature water cooling section;

[0014] An upper-stage differential pressure transmitter is installed on the waste water cooling section;

[0015] A mid-section differential pressure transmitter is installed on the circulating water cooling section;

[0016] A lower-stage differential pressure transmitter is installed on the low-temperature water cooling section.

[0017] Preferably, a spray pipe is provided on the waste hot water cooling section, and an upper section ammonia flushing switch valve is provided on the spray pipe.

[0018] Preferably, a spray pipe is provided on the circulating water cooling section, and a mid-section ammonia flushing switch valve and a mid-section spray switch valve are sequentially provided on the spray pipe.

[0019] Preferably, a spray pipe is provided on the low-temperature water cooling section, and a lower section ammonia flushing switch valve and a lower section spraying switch valve are sequentially provided on the spray pipe.

[0020] Preferably, the ammonia flushing device further includes an ammonia valve, which is connected to the ammonia heater via a pipeline.

[0021] Preferably, the ammonia flushing device further includes a condensate valve, which is connected to the ammonia heater via a pipeline.

[0022] Beneficial effects:

[0023] The ammonia flushing device provided by this invention can control the temperature of the ammonia water, avoiding ineffective flushing with low-temperature ammonia water and enabling rapid standby of the primary cooler. Simultaneously, based on the three-stage cooling characteristic of the horizontal tube primary cooler, the ammonia flushing device can detect the gas resistance in each stage and adjust the flushing position of the ammonia water according to the changes in resistance, achieving refined production operation.

[0024] The ammonia rinsing device provided by this utility model can also automatically control the entire ammonia rinsing switching process, with a high level of automation control and the ability to achieve fine adjustment.

[0025] In addition, the ammonia flushing device provided by this utility model can reduce the amount of water draining from the primary cooler tube circulation water and reduce the labor intensity of employees. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the ammonia flushing device in an embodiment of the present invention.

[0027] The components are as follows: 1. Upper section ammonia flushing switch valve; 2. Upper section differential pressure transmitter; 3. Middle section spray switch valve; 4. Middle section ammonia flushing switch valve; 5. Middle section differential pressure transmitter; 6. Lower section spray switch valve; 7. Lower section ammonia flushing switch valve; 8. Lower section differential pressure transmitter; 9. Ammonia heating temperature control; 10. Ammonia heating regulating valve; 11. Ammonia heater; 12. Ammonia valve; 13. Condensate valve; 14. Horizontal tube primary cooler; 15. Low-temperature water supply; 16. Low-temperature water return; 17. Lower section spray liquid; 18. Circulating water supply; 19. Circulating water return; 20. Middle section spray liquid; 21. Residual hot water supply; 22. Residual hot water return; 23. Heating steam; 24. Circulating ammonia water; 25. Steam condensate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The purpose of this invention is to provide an ammonia flushing device for a primary cooler, which can prevent hot ammonia from being cooled by the circulating water in the primary cooler tubes, thereby ensuring the flushing effect of the primary cooler and enabling it to quickly reach standby status.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, the ammonia water flushing device for a primary cooler provided by this utility model includes: an upper differential pressure transmitter, a middle differential pressure transmitter, a lower differential pressure transmitter, an ammonia water heating temperature control, an ammonia water heating regulating valve, an ammonia water heater, and a horizontal tube primary cooler.

[0032] In this invention, the horizontal tube primary cooler comprises, from top to bottom, a waste hot water cooling section, a circulating water cooling section, and a low-temperature water cooling section. In this invention, the waste hot water cooling section is provided with an outlet and an inlet, from top to bottom. Waste hot water enters through the inlet, and waste hot water returns through the outlet, thereby completing the cooling of the waste hot water. This invention does not have a specific limitation on the source of the waste hot water; any waste hot water source well known to those skilled in the art can be used.

[0033] In this invention, an upper-stage differential pressure transmitter is installed on the waste water cooling section. This invention does not specify a particular model of the upper-stage differential pressure transmitter; any upper-stage differential pressure transmitter well-known to those skilled in the art can be used. In this invention, the upper-stage differential pressure transmitter can be used to detect the resistance of the waste water cooling section on the shell side of the primary cooler, and to adjust the ammonia flushing process in a timely manner based on changes in the resistance of the waste water cooling section.

[0034] In this invention, a spray pipe is also provided on the waste hot water cooling section, and an upper ammonia flushing switch valve is installed on the spray pipe. This invention does not specify a particular model of the upper ammonia flushing switch valve; any upper ammonia flushing switch valve well-known to those skilled in the art can be used. In this invention, when the upper differential pressure transmitter detects that the resistance of the waste hot water cooling section of the primary cooler exceeds a set value, it automatically opens the upper ammonia flushing switch valve, thereby achieving automatic flushing of the waste hot water cooling section of the primary cooler.

[0035] In this invention, the circulating water cooling section is provided with an outlet and an inlet sequentially from top to bottom. Circulating water enters through the inlet and returns through the outlet, thereby completing the circulating water cooling process. This invention does not have a specific limitation on the source of the circulating water; any circulating water source well known to those skilled in the art can be used.

[0036] In this invention, a mid-stage differential pressure transmitter is installed on the circulating water cooling section. This invention does not specify a particular model of the mid-stage differential pressure transmitter; any mid-stage differential pressure transmitter well-known to those skilled in the art can be used. In this invention, the mid-stage differential pressure transmitter can be used to detect the resistance of the circulating water cooling section on the shell side of the primary cooler, and to adjust the spray volume of the mid-stage spraying fluid and the ammonia flushing process in a timely manner based on changes in the resistance of the circulating water cooling section.

[0037] In this invention, a spray pipe is provided on the circulating water cooling section, and a mid-section ammonia flushing switch valve and a mid-section spray switch valve are sequentially installed on the spray pipe. The mid-section spray switch valve is used to spray the mid-section spray liquid. This invention does not have a specific limitation on the specific models of the mid-section ammonia flushing switch valve and the mid-section spray switch valve; any mid-section ammonia flushing switch valve and mid-section spray switch valve well-known to those skilled in the art can be used. In this invention, when the mid-section differential pressure transmitter detects that the resistance of the circulating water cooling section of the primary cooler exceeds a set value, it automatically closes the mid-section spray switch valve and opens the mid-section ammonia flushing switch valve, thereby achieving automatic flushing of the circulating water cooling section of the primary cooler.

[0038] In this invention, the low-temperature water cooling section is provided with an outlet and an inlet sequentially from top to bottom. Low-temperature water enters through the inlet, and low-temperature water exits through the outlet, thereby completing the low-temperature water cooling process. This invention does not have a specific limitation on the source of the low-temperature water; any source of low-temperature water known to those skilled in the art can be used.

[0039] In this invention, a lower-stage differential pressure transmitter is installed on the cryogenic water cooling section. This invention does not specify a particular model of the lower-stage differential pressure transmitter; any lower-stage differential pressure transmitter well-known to those skilled in the art can be used. In this invention, the lower-stage differential pressure transmitter can be used to detect the resistance of the cryogenic water cooling section on the shell side of the primary cooler, and to adjust the spray volume of the lower-stage spraying fluid and the ammonia flushing process in a timely manner based on changes in the resistance of the cryogenic water cooling section.

[0040] In this invention, a spray pipe is provided on the low-temperature water cooling section, and a lower-section ammonia flushing switch valve and a lower-section spraying switch valve are sequentially installed on the spray pipe. The lower-section spraying switch valve is used to spray the lower-section spraying liquid. This invention does not have a specific limitation on the specific models of the lower-section ammonia flushing switch valve and the lower-section spraying switch valve; any lower-section ammonia flushing switch valve and the lower-section spraying switch valve known to those skilled in the art can be used. In this invention, when the lower-section differential pressure transmitter detects that the resistance of the low-temperature water cooling section of the primary cooler exceeds a set value, the lower-section spraying switch valve is automatically closed, and the lower-section ammonia flushing switch valve is opened, thereby achieving automatic flushing of the low-temperature water cooling section of the primary cooler.

[0041] In this invention, the ammonia water heating temperature control, the ammonia water heating regulating valve, and the ammonia water heater are connected by pipelines. The ammonia water heating temperature control is connected to the upper, middle, and lower spray ports of the horizontal tube primary cooler via pipelines. This invention does not impose any particular limitation on the connection method; any connection method well-known to those skilled in the art can be used. In this invention, heating steam flows into the ammonia water heater through the ammonia water heating regulating valve. In this invention, circulating ammonia water flows into the ammonia water heater.

[0042] In this invention, the ammonia flushing device further includes an ammonia valve, which is connected to the ammonia heater via a pipe. This invention does not impose any particular limitation on the connection method; any connection method well-known to those skilled in the art can be used.

[0043] In this invention, the ammonia flushing device further includes a condensate valve, which is connected to the ammonia heater via a pipe. This invention does not impose any particular limitation on the connection method; any connection method well-known to those skilled in the art can be used. In this invention, steam condensate is discharged through the condensate valve.

[0044] In this invention, the ammonia water valve is set to the open state. When the upper, middle, and lower differential pressure transmitters detect excessive resistance in the primary cooler, an ammonia water flushing operation is performed. At this time, circulating ammonia water flows into the ammonia water heater. The steam input is automatically adjusted through the ammonia water heating regulating valve to control the ammonia water temperature at the outlet of the ammonia water heater, ensuring that the heated ammonia water temperature is within the required range. The heated steam condensate is discharged through the condensate valve.

[0045] This specification uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An ammonia flushing device for a primary cooler, characterized in that... include: Upper differential pressure transmitter (2), middle differential pressure transmitter (5), lower differential pressure transmitter (8), ammonia water heating temperature control (9), ammonia water heating regulating valve (10), ammonia water heater (11) and horizontal tube primary cooler (14); The ammonia water heating temperature control (9), the ammonia water heating regulating valve (10), and the ammonia water heater (11) are connected by pipes; The ammonia water heating temperature control (9) is connected to the spray pipe of the horizontal tube primary cooler (14) through a pipeline; The horizontal tube primary cooler (14) includes, from top to bottom, a waste water cooling section, a circulating water cooling section, and a low-temperature water cooling section; The waste water cooling section is equipped with an upper section differential pressure transmitter (2); A mid-section differential pressure transmitter (5) is installed on the circulating water cooling section; A lower-stage differential pressure transmitter (8) is installed on the low-temperature water cooling section.

2. The ammonia flushing device for a primary cooler according to claim 1, characterized in that... A spray pipe is installed on the waste water cooling section, and an upper section ammonia flushing switch valve (1) is installed on the spray pipe.

3. The ammonia flushing device for a primary cooler according to claim 1, characterized in that... The circulating water cooling section is equipped with a spray pipe, and the spray pipe is equipped with a mid-section ammonia flushing switch valve (4) and a mid-section spray switch valve (3) in sequence.

4. An ammonia flushing device for a primary cooler according to claim 1, characterized in that... A spray pipe is provided on the low-temperature water cooling section, and a lower section ammonia water flushing switch valve (7) and a lower section spraying switch valve (6) are sequentially provided on the spray pipe.

5. An ammonia flushing device for a primary cooler according to claim 1, characterized in that... The ammonia flushing device also includes an ammonia valve (12), which is connected to the ammonia heater (11) via a pipe.

6. An ammonia flushing device for a primary cooler according to claim 1, characterized in that... The ammonia flushing device also includes a condensate valve (13), which is connected to the ammonia heater (11) via a pipe.

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