Phenol ammonia recovery anti-blocking structure

Abstract

The utility model relates to a kind of phenol ammonia recovery anti-blocking structure, including deaminating tower, the bottom liquid output of deaminating tower is connected with the inlet of deaminating tower pump by pipeline, the outlet of deaminating tower pump is connected with the inlet of solid phase filter by pipeline, the outlet of solid phase filter is divided into two routes, one is connected with the inlet of deaminating tower reboiler, another is connected with the first inlet of liquid-liquid mixer, the outlet of liquid-liquid mixer is sequentially connected with the liquid inlet of extraction tower top by primary heat exchanger, secondary heat exchanger, the outlet of extraction tower top is communicated with extractant tank by pipeline, the output of extractant tank is connected with the inlet of extractant output pump by pipeline, the outlet of extractant pump is divided into two routes, one is connected with the second inlet of liquid-liquid mixer by pipeline, another is exported by pipeline.The utility model has realized under the premise of not greatly changing original process, significantly improve the removal effect of solid suspended matter and oil, effectively solve the problem of jam.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a phenol and ammonia recovery anti-clogging structure. Background Technology

[0002] Semi-coke is an indispensable intermediate product in the chemical and metallurgical industries and is widely used. The production of semi-coke generates a large amount of wastewater, characterized by high concentrations of phenols (especially lower phenols), ammonia nitrogen, cyanide, tar, and recalcitrant organic matter. This wastewater is characterized by its complex composition, high toxicity, and poor biodegradability, making it far more difficult to treat than general industrial wastewater. Current semi-coke wastewater treatment processes mainly employ a chemical + biological approach. First, acidic gases, ammonia, and phenols are removed chemically, followed by the removal of remaining pollutants such as COD and nitrogen through biological processes. The chemical approach primarily involves phenol-ammonia recovery processes.

[0003] The process of first extracting to remove phenols and then distilling to remove ammonia has been phased out because it leads to poor extraction efficiency, excessive extractant residue, and easy blockage by ammonium salt crystals at the end. The current mainstream phenol and ammonia recovery process is deacidification → deammonia → dephenolization → solvent recovery → subsequent biochemical process.

[0004] Due to the presence of oil and suspended solids (composed of coke particles, coal dust and oil) in the wastewater, scale and blockages can occur on the surfaces of equipment such as heat exchangers and reboilers after the ammonia removal tower during the operation of the existing process, affecting the operation of the heat exchangers, reboilers and the entire production unit.

[0005] Existing methods for dealing with blockages mainly include: ① shutdown / offline cleaning; ② using anti-blockage equipment (such as Chinese Patent Publication No. CN 211706011U, titled "An Anti-blockage Semi-coke Wastewater Treatment Device"); ③ reducing blockages by increasing design margins, but these methods can affect stable production, increase equipment investment, and increase equipment costs, and do not solve the fundamental problem, so they are usually ineffective. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a phenol and ammonia recovery anti-clogging structure that is reasonably designed, simple in structure, low in cost, and has a good anti-clogging effect.

[0007] The technical solution adopted to solve the above-mentioned technical problems is: a phenol-ammonia recovery anti-clogging structure, including an ammonia stripping tower. The bottom liquid outlet of the ammonia stripping tower is connected to the inlet of the ammonia stripping tower pump through a pipeline. The outlet of the ammonia stripping tower pump is connected to the inlet of the solid phase filter through a pipeline. The outlet of the solid phase filter is divided into two paths: one path is connected to the inlet of the reboiler of the ammonia stripping tower, and the other path is connected to the first inlet of the liquid-liquid mixer. The outlet of the liquid-liquid mixer is connected to the liquid inlet at the top of the extraction tower through a primary heat exchanger and a secondary heat exchanger in sequence. The extract outlet at the top of the extraction tower is connected to the extract tank through a pipeline. The outlet of the extract tank is connected to the inlet of the extract output pump through a pipeline. The outlet of the extract pump is divided into two paths: one path is connected to the second inlet of the liquid-liquid mixer through a pipeline, and the other path is output through a pipeline.

[0008] As a preferred technical solution, the liquid-liquid mixer is any one of a static mixer, a dynamic mixer, a jet mixer, or a venturi mixer.

[0009] As a preferred technical solution, the mesh size of the solid-phase filter is set to 3μm to 100μm.

[0010] The beneficial effects of this utility model are as follows: This invention connects the outlet of the deammoniation tower pump to the inlet of the solid-phase filter. The outlet of the solid-phase filter is divided into two paths: one connected to the inlet of the deammoniation tower reboiler, and the other connected to the first inlet of the liquid-liquid mixer. The deammoniation tower reboiler is changed from the existing siphon circulation to forced circulation, with the circulation rate fixed at the design rate. At high temperature, the solid-phase filter intercepts and removes solid suspended matter with increased particle size, eliminating clogging factors. An extract is then led from the extract tank to the liquid-liquid mixer. Through the pre-extraction effect of the extract, a small amount of solid suspended matter and dissolved oil are extracted to the oil phase, further removing clogging factors. This invention achieves a significant improvement in the removal efficiency of solid suspended matter and oil without drastically altering the original process, effectively solving the clogging problem, extending the service life of the equipment, and reducing the frequency of equipment replacement and maintenance costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] The components include: 1. Deammoniation tower; 2. Deammoniation tower pump; 3. Deammoniation tower reboiler; 4. Solid phase filter; 5. Liquid-liquid mixer; 6. Primary heat exchanger; 7. Extraction tower; 8. Secondary heat exchanger; 9. Extract tank; and 10. Extract output pump. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0014] exist Figure 1 In this embodiment, the phenol-ammonia recovery anti-clogging structure includes an ammonia stripping tower 1. The bottom liquid outlet of the ammonia stripping tower 1 is connected to the inlet of the ammonia stripping tower pump 2 via a pipeline. The outlet of the ammonia stripping tower pump 2 is connected to the inlet of the solid phase filter 4 via a pipeline. The solid phase filter 4 has a mesh size of 3μm to 100μm and is used to filter out larger solid suspended particles and remove them from the system, thereby preventing solid suspended particles from scaling on the surface of the heat exchanger and reboiler.

[0015] The outlet of the solid filter 4 is divided into two paths: one path is connected to the inlet of the reboiler 3 of the deammoniation tower, and the other path is connected to the first inlet of the liquid-liquid mixer. The liquid-liquid mixer 5 is a static mixer. The outlet of the liquid-liquid mixer 5 is connected to the liquid inlet at the top of the extraction tower 7 through the first-stage heat exchanger 6 and the second-stage heat exchanger 8 in sequence. The extract outlet at the top of the extraction tower 7 is connected to the extract tank 9 through a pipe. The outlet of the extract tank 9 is connected to the inlet of the extract output pump 10 through a pipe. The outlet of the extract pump is divided into two paths: one path is connected to the second inlet of the liquid-liquid mixer 5 through a pipe, and the other path is output through a pipe.

[0016] The liquid-liquid mixer 5 in this embodiment can also be any one of a dynamic mixer, a jet mixer, or a venturi mixer.

[0017] The working principle of this utility model is as follows: The deammonia removal tower pump divides the waste liquid output from the bottom liquid outlet of deammonia removal tower 1 into two streams via solid-phase filter 4. One stream is sent to the deammonia removal tower reboiler 3, ensuring a forced circulation mode and stable liquid flow. A liquid-liquid mixer 5 is installed between the solid-phase filter 4 and the primary heat exchanger 6. An extract stream from the extract tank 9 is also routed to the liquid-liquid mixer 5, with a flow rate of 0.1% to 30% of the wastewater flow. Through the liquid-liquid mixer 5, the extract and wastewater are thoroughly mixed. Utilizing the affinity of the extractant for oil and a small amount of suspended solids, the soluble oil and some suspended solids in the wastewater are extracted into the oil phase. The oil phase is then separated and carried out of the system, thus reducing clogging factors.

[0018] The applicant applied this utility model to an existing phenol and ammonia recovery system to detect suspended solids in the pipeline, with the following specific effects: Solid phase filter 4's effect on removing suspended solids (SS): 1 5930.1 216.5 96.35% 0.01 2 5780 440 92.39% 0.03 3 6010 550 90.85% 0.06 Liquid-liquid mixer 5's effect on removing suspended solids (SS) and oil: 1 0.1 530 220 2 0.1 112 34 3 0.05 112 64

Claims

1. A phenol-ammonia recovery anti-clogging structure, comprising an ammonia stripping tower (1), characterized in that: The bottom liquid outlet of the deammoniation tower (1) is connected to the inlet of the deammoniation tower pump (2) through a pipeline. The outlet of the deammoniation tower pump (2) is connected to the inlet of the solid phase filter (4) through a pipeline. The outlet of the solid phase filter (4) is divided into two paths: one path is connected to the inlet of the deammoniation tower reboiler (3), and the other path is connected to the first inlet of the liquid-liquid mixer (5). The outlet of the liquid-liquid mixer (5) is connected to the liquid inlet at the top of the extraction tower (7) through the first-stage heat exchanger (6) and the second-stage heat exchanger (8). The extract outlet at the top of the extraction tower (7) is connected to the extract tank (9) through a pipeline. The outlet of the extract tank (9) is connected to the inlet of the extract output pump (10) through a pipeline. The outlet of the extract pump is divided into two paths: one path is connected to the second inlet of the liquid-liquid mixer (5) through a pipeline, and the other path is output through a pipeline.

2. The phenol-ammonia recovery anti-clogging structure according to claim 1, characterized in that: The liquid-liquid mixer (5) is any one of a static mixer, a dynamic mixer, a jet mixer, or a venturi mixer.

3. The phenol-ammonia recovery anti-clogging structure according to claim 1, characterized in that: The mesh size of the solid filter (4) is set to 3μm to 100μm.

Images