A device for cleaning a desulfurization tower

Abstract

The utility model relates to coking technical field, especially a kind of device for cleaning desulfurization tower, including desulfurization tower, lye tank, waste lye tank, ammonia distillation wastewater feed pipe, desulfurization tower includes tower body upper section and tower body lower section, lye tank and ammonia distillation wastewater feed pipe are connected with lye inlet pipe, lye inlet pipe is connected with the upper portion of tower body upper section, the bottom of tower body upper section is connected with waste lye tank by waste lye external discharge pipe, cleaning circulation tank is equipped between lye inlet pipe and waste lye external discharge pipe, the top of cleaning circulation tank is equipped with cleaning liquid return pipe and waste lye external discharge pipe connection, U type water seal section is equipped on cleaning liquid return pipe, the bottom of cleaning circulation tank is connected with lye inlet pipe by cleaning liquid inlet pipe, the top of cleaning circulation tank is also equipped with clean water inlet pipe, cleaning liquid return pipe is connected with cleaning external discharge pipe.The utility model solves the problem of large equipment resistance caused by tower body upper section bottom tower tray alkali scale.

Description

Technical Field

[0001] This utility model belongs to the field of coking technology, and specifically relates to a device for cleaning desulfurization towers. Background Technology

[0002] In the vacuum potassium carbonate desulfurization process used in the coke oven gas condensation and purification, a NaOH alkaline washing section is installed at the top of the desulfurization tower. The 40% NaOH alkaline solution required for the decomposition and fixation of ammonium salts by the remaining ammonia water stripping unit is diluted to about 5% by the ammonia stripping wastewater and then sprayed into the alkaline washing section to further remove H2S from the gas. After the desulfurization tower has been running for a certain period of time, a large amount of alkaline scale will be attached to the trays of the NaOH alkaline washing section, causing poor liquid leveling in the trays. The liquid level in the trays rises, trapping the gas and increasing the resistance of the gas system, which can easily lead to coke oven venting. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a device for cleaning desulfurization towers, which can achieve online rapid cleaning and extend the maintenance cycle.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An apparatus for cleaning a desulfurization tower includes a desulfurization tower, an alkali tank, a waste alkali tank, and an ammonia-containing wastewater supply pipe. The desulfurization tower includes an upper section and a lower section. The alkali tank and the ammonia-containing wastewater supply pipe are both connected to an alkali inlet pipe. The alkali inlet pipe is connected to the upper part of the upper section of the tower. The bottom of the upper section of the tower is connected to the waste alkali tank via a waste alkali discharge pipe. A cleaning circulation tank is provided between the alkali inlet pipe and the waste alkali discharge pipe. A cleaning liquid return pipe is provided at the top of the cleaning circulation tank and connected to the waste alkali discharge pipe. A U-shaped water seal section is provided on the cleaning liquid return pipe. The bottom of the cleaning circulation tank is connected to the alkali inlet pipe via a cleaning liquid inlet pipe. A clean water inlet pipe is also provided at the top of the cleaning circulation tank. A cleaning discharge pipe is connected to the cleaning liquid return pipe.

[0006] A mixer is provided on the alkaline solution inlet pipe.

[0007] The bottom of the U-shaped water seal section is equipped with a vent valve.

[0008] The bottom of the cleaning circulation tank is connected to a waste discharge pipe.

[0009] A cleaning pump is installed on the cleaning fluid inlet pipe.

[0010] Compared with existing technologies, the beneficial effects of this utility model are:

[0011] This invention enables rapid online cleaning of desulfurization towers without altering their structure, thus solving the problem of high equipment resistance caused by alkali scale buildup on the bottom trays of the upper section of the tower.

[0012] The front end of the cleaning circulation tank is equipped with a U-shaped water seal section. After cleaning, the U-shaped water seal section can prevent the gas in the desulfurization tower from entering the cleaning circulation tank. During the cleaning process, the vent valve at the bottom of the U-shaped water seal section is used to vent and drain water, eliminate gas resistance, and ensure that the cleaning fluid returns smoothly to the cleaning circulation tank.

[0013] The cleaning solution return pipe is connected to the cleaning discharge pipe, allowing for rinsing with clean water during the early and late stages of desulfurization tower cleaning. The solution is then discharged through the cleaning discharge pipe, saving acid consumption and shortening cleaning time.

[0014] The process is safe, continuous, stable, and efficient. The maintenance cycle for the bottom tray of the upper section of the desulfurization tower has been extended from 6 months to 12 months, saving maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] In the diagram: 1. Desulfurization tower; 2. Alkali tank; 3. Waste alkali tank; 4. Ammonia stripping wastewater supply pipe; 5. Alkali inlet pipe; 6. Waste alkali discharge pipe; 7. Cleaning circulation tank; 8. Cleaning liquid return pipe; 9. U-shaped water seal section; 10. Cleaning liquid inlet pipe; 11. Cleaning liquid discharge pipe; 12. Mixer; 13. Waste discharge pipe; 14. Vent valve; 15. Cleaning pump; 16. Upper section of tower body; 101. Lower section of tower body; 102. Detailed Implementation

[0017] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figure 1An apparatus for cleaning a desulfurization tower includes a desulfurization tower 1, an alkali tank 2, a waste alkali tank 3, and an ammonia-containing wastewater supply pipe 4. The desulfurization tower 1 includes an upper section 101 and a lower section 102. The alkali tank 2 contains a 40% NaOH solution. Both the alkali tank 2 and the ammonia-containing wastewater supply pipe 4 are connected to an alkali inlet pipe 5, which is connected to the upper part of the upper section 101. The bottom of the upper section 101 is connected to the waste alkali outlet pipe 6. Waste alkali tank 3 is connected, and a cleaning circulation tank 7 is provided between the alkali inlet pipe 5 and the waste alkali outlet pipe 6. The top of the cleaning circulation tank 7 is provided with a cleaning liquid return pipe 8 connected to the waste alkali outlet pipe 6. A U-shaped water seal section 9 is provided on the cleaning liquid return pipe 8. The bottom of the cleaning circulation tank 7 is connected to the alkali inlet pipe 5 through the cleaning liquid inlet pipe 10. The top of the cleaning circulation tank 7 is also provided with a clean water inlet pipe 11. The cleaning liquid return pipe 8 is connected to the cleaning outlet pipe 12.

[0020] The alkaline solution inlet pipe 5 is equipped with a mixer 13.

[0021] The bottom of the U-shaped water seal section 9 is provided with a vent valve 15.

[0022] The bottom of the cleaning circulation tank 7 is connected to the waste discharge pipe 14.

[0023] The cleaning fluid inlet pipe 10 is equipped with a cleaning pump 16.

[0024] Work process:

[0025] First, fill the cleaning circulation tank 7 with clean water. Start the cleaning pump 16 to rinse the upper section 101 of the tower. The rinsing waste liquid is discharged from the cleaning drain pipe 12. After the pH value of the rinsing waste liquid is neutral, add a 36% hydrochloric acid solution to the cleaning circulation tank 7 to acid wash the bottom trays of the upper section 101 of the tower until the reaction inside the tower stops, then stop the acid washing. Refill the cleaning circulation tank with clean water to rinse the upper section 101 of the tower. After the pH value inside the tower is neutral, resume the alkaline washing operation of the upper section 101 of the tower.

[0026] To make the objectives, technical solutions, and technical effects of this utility model clearer, the technical solutions in the embodiments of this utility model are now described clearly and completely. However, the embodiments described below are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] Example

[0028] An apparatus for cleaning a desulfurization tower includes a desulfurization tower 1, an alkali tank 2, a waste alkali tank 3, and an ammonia-containing wastewater supply pipe 4. The desulfurization tower 1 includes an upper section 101 and a lower section 102. The alkali tank 2 contains a 40% NaOH solution. Both the alkali tank 2 and the ammonia-containing wastewater supply pipe 4 are connected to an alkali inlet pipe 5, which is equipped with a mixer 13. The 40% NaOH solution and the ammonia-containing wastewater are mixed in the mixer 13. The alkali inlet pipe 5 is connected to the upper part of the upper section 101, and the bottom of the upper section 101 is connected to the waste alkali tank 3 via a waste alkali discharge pipe 6.

[0029] A cleaning circulation tank 7 is installed between the alkali inlet pipe 5 and the waste alkali outlet pipe 6. A cleaning liquid return pipe 8 is connected to the waste alkali outlet pipe 6 at the top of the cleaning circulation tank 7. A U-shaped water seal section 9 is installed on the cleaning liquid return pipe 8, and a vent valve 15 is installed at the bottom of the U-shaped water seal section 9. The bottom of the cleaning circulation tank 7 is connected to the alkali inlet pipe 5 via a cleaning liquid inlet pipe 10, and a cleaning pump 16 is installed on the cleaning liquid inlet pipe 10. The cleaning circulation tank 7 has a diameter of 1.8m and a height of 1.4m, and the cleaning pump has a flow rate of 30m³ / h. 3 / h, head 45m.

[0030] The top of the cleaning circulation tank 7 is also equipped with a clean water inlet pipe 11, and the cleaning fluid return pipe 8 is connected to the cleaning outflow pipe 12. The bottom of the cleaning circulation tank 7 is connected to the waste discharge pipe 14.

[0031] After the desulfurization tower was cleaned online, the system resistance was reduced from 3.8 kPa to 1.5 kPa.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and basic spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for cleaning a desulfurization tower, comprising a desulfurization tower, an alkali tank, a waste alkali tank, and an ammonia-containing wastewater supply pipe, wherein the desulfurization tower includes an upper section and a lower section, the alkali tank and the ammonia-containing wastewater supply pipe are both connected to an alkali inlet pipe, the alkali inlet pipe is connected to the upper part of the upper section of the tower, and the bottom of the upper section of the tower is connected to the waste alkali tank via a waste alkali discharge pipe, characterized in that... A cleaning circulation tank is provided between the alkali inlet pipe and the waste alkali outlet pipe. The top of the cleaning circulation tank is provided with a cleaning liquid return pipe connected to the waste alkali outlet pipe. A U-shaped water seal section is provided on the cleaning liquid return pipe. The bottom of the cleaning circulation tank is connected to the alkali inlet pipe through the cleaning liquid inlet pipe. The top of the cleaning circulation tank is also provided with a clean water inlet pipe. The cleaning liquid return pipe is connected to the cleaning outlet pipe.

2. A device for cleaning a desulfurization tower according to claim 1, characterized in that, A mixer is provided on the alkaline solution inlet pipe.

3. The apparatus for cleaning a desulfurization tower according to claim 1, characterized in that, The bottom of the U-shaped water seal section is equipped with a vent valve.

4. The apparatus for cleaning a desulfurization tower according to claim 1, characterized in that, The bottom of the cleaning circulation tank is connected to a waste discharge pipe.

5. The apparatus for cleaning a desulfurization tower according to claim 1, characterized in that, A cleaning pump is installed on the cleaning fluid inlet pipe.

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