Descaling and chemical washing device for Texaco gasified discharged water

Abstract

The utility model relates to the technical field of coal water slurry gasification slag water treatment sections, and discloses a Texaco gasification external drainage water descaling chemical washing device which comprises a chemical washing water tank, a chemical washing pump and a chemical washing agent, and three external drainage pipelines are respectively an external drainage 1 # line, an external drainage 2 # line and an external drainage 3 # line. And the outer drainage 1 # line, the outer drainage 2 # line and the outer drainage 3 # line are communicated with one another. According to the descaling and chemical washing device for the Texaco gasified discharged water, hydrochloric acid which is high in carbonate dissolving speed is used as a main chemical agent for chemical washing, a corrosion inhibitor and a defoaming agent are added in a matched mode, and chemical washing is carried out in a circulating washing mode through the washing pump, so that the difficult problems that after the discharged water pipeline is scaled, the amount of discharged water of a system is insufficient and the like are solved; the method has the advantages of convenience in operation, low chemical washing cost and the like, solves the technical problems of incapability of normally delivering system water, poor system water quality and the like caused by scaling of an external drainage pipeline, and ensures long-period stable operation of the system.

Description

TECHNICAL FIELD

[0001] The utility model relates to water coal slurry gasification slag water treatment section technical field, specifically is a texaco gasification effluent water scale removal washing device. BACKGROUND

[0002] In recent years, coal chemical industry has become the strategic focus of economic development, and the texaco coal slurry pressurized gasification technology is the second generation of coal gasification process technology which is successfully developed and first realizes industrialized production, has the characteristics of mature technology, simple process, high reaction efficiency. However, the coal gasification slag water system generally exists the problem of scale formation in the waste water discharge pipeline during operation, which leads to difficult external delivery and seriously affects the long-period operation of the gasification furnace. The black water discharged from the gasification furnace and the black water discharged from the washing tower are sent to the high-pressure flash evaporation system for flash evaporation after pressure reduction by the regulating valve, the concentrated black water is sent to the settling tank after being pressurized by the settling tank feed pump, in order to accelerate the settling speed of the black water in the settling tank, a flocculating agent is added at the inlet of the settling tank, the water quality in the settling tank is purified by the flocculating agent, and the overflow of the grey water from the settling tank is sent to the grey water tank, in order to alleviate the scaling of the water quality, a chemical inhibitor is added to the grey water in the grey water tank, and a part of the grey water is sent to the water treatment device by the grey water pump. In the production operation process, although a large amount of grey water flocculating agent and inhibitor is added to the system, there are still problems of fast scaling of the waste water discharge pipeline, small amount of external delivery water and the like, which seriously affect the long-period stable operation of the gasification system.

[0003] In view of this problem, the coal chemical industry has taken corresponding prior art measures, which are roughly divided into the following two methods:

[0004] The first scheme is to periodically clean the pipeline by high-pressure cleaning to solve the problem of difficult waste water delivery. In this scheme, a plurality of high-pressure cleaning ports need to be added to the original designed pipeline, and because the external delivery pipeline is long and generally laid on the pipe gallery, the cleaning workload is huge, the working environment is poor, the cleaning risk is high, and the time-consuming is long.

[0005] The second scheme is to use the nucleation granulation technology to add sodium hydroxide to the system, and when the calcium ions in the water react with the carbonate ions at a certain pH value, calcium carbonate precipitate is generated; when the magnesium ions in the water react with the hydroxide ions at a certain pH value, magnesium hydroxide precipitate is generated, which is crystallized on the professional crystal and removed from the water; this scheme has the problems of high cost, large occupied area, and easy to cause problems such as blockage of the quenching water filter screen, quenching ring, low-pressure flash evaporation system and waste water cooler.

[0006] Through comprehensive analysis, the above-mentioned measures all have great disadvantages, and combined with the characteristics of the gasification water quality and the scale analysis, the water quality contains calcium, magnesium and silicon dioxide, which has high hardness and high alkalinity, and becomes the key reason for easy scaling of the grey water pipeline. UTILITY MODEL CONTENT

[0007] The utility model discloses a kind of Texaco gasification external drainage scale removal washing device, to solve the problem that the key reason of easy scale formation of ash water pipeline is combined with gasification water quality characteristics and scale piece analysis in the above background art: calcium, magnesium, silicon dioxide etc.

[0008] To achieve the above object, the utility model provides the following technical scheme: a kind of Texaco gasification external drainage scale removal washing device, including washing water tank, washing pump and washing reagent, wherein external drainage has three pipelines respectively external drainage 1# line, external drainage 2# line and external drainage 3# line, external drainage 1# line, external drainage 2# line and external drainage 3# line are interconnected.

[0009] As a preferred technical scheme of the utility model, the washing water tank is guided into by pipeline with fresh water, the washing water tank is guided into by pipeline with washing reagent, the configured washing reagent is communicated with external drainage 2# line by setting washing pump, external drainage 3# line is communicated with washing water tank.

[0010] As a preferred technical scheme of the utility model, ash water pump outlet to 3# line blind plate is arranged between external drainage 3# line and external drainage 2# line, 1# line and 2# line communication blind plate is arranged between ash water pump outlet to 3# line blind plate and external drainage 2# line, 3# line and 1# line communication blind plate is arranged between external drainage 3# line and between drainage 1# line.

[0011] As a preferred technical scheme of the utility model, external drainage 1# line and external drainage 2# line are communicated with emergency accident pool, external drainage 1# line and emergency accident pool are provided with external delivery water to emergency accident pool blind plate, 2# line to cooling tower blind plate is arranged between external drainage 1# line and external drainage 2# line, and external drainage 1# line is communicated with cooling tower.

[0012] As a preferred technical scheme of the utility model, ash water pump is arranged on external drainage 1# line, and the ash water pump guides low-pressure ash water into external drainage 1# line.

[0013] As a preferred technical scheme of the utility model, the washing water tank is communicated with washing water tank sampling point by pipeline, the washing water tank is communicated with washing water tank discharge guide by pipeline, and the washing water tank discharge guide is communicated with ditch.

[0014] As a preferred technical scheme of the utility model, exhaust valve is arranged on external drainage 3# line.

[0015] Compared with prior art, the utility model has the beneficial effects that:

[0016] 1. This Texaco gasification external drainage descaling and cleaning device is designed specifically for the characteristics of scale buildup in wastewater discharge pipelines and the on-site pipe layout. It uses hydrochloric acid, which dissolves carbonates quickly, as the main chemical cleaning agent, combined with corrosion inhibitors and defoamers. Chemical cleaning is performed using a circulating cleaning pump. The scale is mainly composed of carbonates and silicates. This external drainage chemical cleaning and descaling device is highly targeted, allowing for regular pipeline chemical cleaning and descaling, thoroughly solving problems such as difficulties in external drainage and delivery. It has a simple structure, is easy to operate, and achieves the expected solution.

[0017] 2. The Texaco gasification external drainage descaling and cleaning device, after adopting this chemical cleaning technology, can quickly solve the problems of insufficient wastewater delivery and poor system water quality caused by scale buildup in the gasification external wastewater pipeline, ensuring system water quality, thereby improving the continuous and stable operation cycle of the system and avoiding the problems of large workload and high risk of high-pressure cleaning. Attached Figure Description

[0018] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0019] Figure 1 This is a flowchart illustrating the process of this utility model.

[0020] In the diagram: 1. Low-pressure grey water; 2. Grey water pump; 3. Chemical cleaning pump; 4. Fresh water; 5. Chemical cleaning water tank; 6. External water supply to emergency accident pool blind flange; 7. Emergency accident pool; 8. External drainage line 1; 9. Line 2 to cooling tower blind flange; 10. Cooling tower; 11. Line 3 connecting to line 1 blind flange; 12. External drainage line 3; 13. External drainage line 2; 14. Line 1 connecting to line 2 blind flange; 15. Grey water pump outlet to line 3 blind flange; 16. Chemical cleaning water tank sampling point; 17. Chemical cleaning water tank discharge drain; 18. Chemical cleaning agent; 19. Air vent valve. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1 This utility model provides a technical solution: a Texaco vaporization external drainage descaling and cleaning device, including a cleaning water tank 5, a cleaning pump 3, and a cleaning agent 18. The external drainage has three pipelines: external drainage line 1# 8, external drainage line 2# 13, and external drainage line 3# 12.Figure 1 The external drainage system uses external drainage line 1 (8), external drainage line 2 (13), and external drainage line 3 (12) for chemical cleaning. The prepared chemical solution is transported by chemical cleaning pump 3, and then returns to the chemical cleaning tank 5 via external drainage line 2 (13) and external drainage line 3 (12), allowing the chemical solution to circulate in the pipeline for chemical cleaning and descaling. Specific implementation method:

[0023] To prevent acid from leaking into other systems during the chemical cleaning process, blind flanges are first installed for isolation. The blind flanges installed include: blind flange 6 for external water supply to the emergency accident pool, blind flange 9 for line 2 to the cooling tower, blind flange 11 for connecting line 3 and line 1, blind flange 14 for connecting line 1 and line 2, and blind flange 15 for connecting the ash water pump outlet to line 3. Then, fresh water 4 is filled into the chemical cleaning tank 5 of the chemical cleaning unit, and the chemical cleaning pump 3 is turned on to fill the external drainage line 2 13 and external drainage line 3 12 with water. After the circulation pipeline is unobstructed, leaks are checked and repaired at all pipeline connections, welds, and blind flange installation points.

[0024] After the circulation system is normal, open the drain 17 of the chemical cleaning tank to lower the liquid level of the chemical cleaning tank 5 to 30%. Then, slowly add chemical cleaning agent 18 (30% concentration hydrochloric acid) to the chemical cleaning tank 5. Analyze the sample at the sampling point 16 in the chemical cleaning tank to control the hydrochloric acid concentration in the chemical cleaning tank 5 to 5%. Circulate the cleaning solution into the system through the chemical cleaning pump 3, observe the return liquid, and the operator should measure the pH value of the cleaning circulating liquid at any time. Maintain the pH value of the pickling solution between 2 and 4 by controlling the amount of hydrochloric acid and fresh water 4 added. Add chemical cleaning agent 18 (hydrochloric acid slow-release agent and defoamer) to the pickling solution again at a ratio of 0.1-1% (w%).

[0025] When adding cleaning agent, adjust the opening of the outlet valve of chemical cleaning pump 3 to control the chemical cleaning circulation volume, ensuring that it does not overload. After the cleaning solution returns to the return water point of external drainage line 3#12, it indicates that the cleaning system is full of cleaning solution.

[0026] Close the outlet valve and return water valve of chemical cleaning pump 3, stop chemical cleaning pump 3, open the exhaust valve 19, and let the cleaning system soak statically for about 4 hours. When there are no more bubbles at the exhaust port, close the exhaust valve, open the outlet and return water valves, and start chemical cleaning pump 3 again to start the circulation cleaning.

[0027] During the circulating cleaning process, a dedicated person should be assigned to monitor and control the liquid level in the chemical cleaning tank 5 to prevent overflow and cavitation. The pH value or acidity should be monitored every two hours. When the pH value rises to around 4, hydrochloric acid can be slowly added to the cleaning system until the pH value of the cleaning solution returns to around 2.

[0028] Disassemble the external drainage pipeline of the chemical cleaning process for inspection. When there are no scale particles, the chemical cleaning process is complete. Inject sodium hydroxide alkaline solution into the chemical cleaning water tank 5 to neutralize and replace the acid in the equipment. After the pH value becomes neutral, discharge it from the chemical cleaning water tank drain 17 to the ditch, and then into the sedimentation tank and sludge treatment system to achieve safe and environmentally friendly discharge.

[0029] The same steps as above can also be used to achieve chemical cleaning and descaling through the circulation of external drainage line 1#8 and external drainage line 3#12, and external drainage line 1#8 and external drainage line 2#13.

[0030] Working principle: Hydrochloric acid, which dissolves carbonates quickly, is used as the main chemical cleaning agent. Corrosion inhibitors and defoamers are added, and chemical cleaning is carried out by circulating the cleaning pump. This solves the difficult problems such as insufficient water delivery caused by scaling in the external drainage pipeline. It has the advantages of convenient operation and low chemical cleaning cost. It solves the technical problems of the system being unable to deliver water normally and poor water quality caused by scaling in the external drainage pipeline, and ensures the long-term stable operation of the system.

[0031] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A Texaco gasification effluent water descaling device characterized by: Including washing sink (5), washing pump (3) and washing agent (18), wherein the three pipelines of the external drainage are respectively external drainage 1# line (8), external drainage 2# line (13) and external drainage 3# line (12), and the external drainage 1# line (8), the external drainage 2# line (13) and the external drainage 3# line (12) are communicated with each other.

2. A Texico vaporizing drain descaling device as defined in claim 1, wherein: The washing sink (5) is introduced with fresh water (4) by setting pipeline, the washing sink (5) is introduced with washing agent (18) by setting pipeline, the prepared washing agent (18) is communicated with the external drainage 2# line (13) by setting washing pump (3), and the external drainage 3# line (12) is communicated with the washing sink (5).

3. A Texico vaporizing drain descaling device as defined in claim 1 wherein: The washing sink (5) is introduced with fresh water (4) by setting pipeline, the washing sink (5) is introduced with washing agent (18) by setting pipeline, the prepared washing agent (18) is communicated with the external drainage 2# line (13) by setting washing pump (3), and the external drainage 3# line (12) is communicated with the washing sink (5).

4. A Texico vaporizing drain descaling device as defined in claim 1 wherein: The external drainage 1# line (8) and the external drainage 2# line (13) are communicated with the emergency accident pool (7), the external drainage 1# line (8) and the emergency accident pool (7) are provided with an external water delivery emergency accident pool blind plate (6), the external drainage 1# line (8) and the external drainage 2# line (13) are provided with a 2# line to cooling tower blind plate (9), and the external drainage 1# line (8) is communicated with a cooling tower (10).

5. A Texico vaporizing drain descaling device as defined in claim 1 wherein: The external drainage 1# line (8) is provided with a grey water pump (2), and the grey water pump (2) introduces low-pressure grey water (1) into the external drainage 1# line (8).

6. A Texico vaporizing drain descaling device as defined in claim 1 wherein: The washing sink (5) is communicated with a washing sink sampling point (16) by pipeline, the washing sink (5) is communicated with a washing sink discharge guide (17) by pipeline, and the washing sink discharge guide (17) is communicated with a ditch.

7. A Texico vaporizing drain descaling device as defined in claim 1 wherein: The external drainage 3# line (12) is provided with an exhaust valve (19).

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