System for controlling ammonia distillation quality of residual ammonia water in circulating ammonia water
By combining a surface filter and a plate and frame filter press system, the problem of deteriorating quality of circulating ammonia water in coking production was solved, achieving efficient ammonia stripping and stable water quality, and improving resource recovery capacity and environmental benefits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-03-27
AI Technical Summary
In the coking process, the deterioration of the quality of the circulating ammonia water affects the ammonia stripping effect and heat exchange efficiency of the remaining ammonia water. Conventional dosing methods cannot solve the problem of suspended solids and other impurities, causing subsequent processes to malfunction.
The filtration system, which combines a surface filter and a plate and frame filter press, is connected to a residual ammonia water pump, a clear liquid pipe, and a steam pipe to achieve multi-stage filtration and pre-coating of residual ammonia water. Combined with backwashing and hot steam treatment, it ensures stable water quality.
It significantly improves ammonia stripping efficiency and water quality stability, reduces turbidity, adapts to a wide range of water quality fluctuations, achieves efficient resource recovery and environmental benefits, and reduces manual management costs.
Smart Images
Figure CN224047196U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of circulating ammonia water, especially to the field of quality control of residual ammonia water in coking production, in particular to a system for controlling the ammonia stripping quality of residual ammonia water in circulating ammonia water. BACKGROUND
[0002] In the coking production process, due to the control of coal blending cost, the quality of circulating ammonia water will deteriorate, which will affect the ammonia stripping and heat exchange efficiency of residual ammonia water, the cooling heat exchange efficiency, and the influent temperature and other indicators of subsequent biochemical water treatment, so that the biochemical system cannot operate normally. The conventional method of adding chemicals in circulating ammonia water cannot solve the problem after the change of the coal blending scheme, and the subsequent process cannot operate. SUMMARY
[0003] The utility model discloses to solve the circulating ammonia water quality deterioration in the prior art in the coking production process, and then affect the ammonia stripping effect and heat exchange efficiency of residual ammonia water, the conventional design in circulating ammonia water adds the method of medicine, cannot solve the residual suspended solids and other impurities of residual ammonia water, cannot meet the requirements of subsequent process and a series of problems, and provides a system for controlling the ammonia stripping quality of residual ammonia water in circulating ammonia water.
[0004] The utility model provides a system for controlling the ammonia stripping quality of residual ammonia water in circulating ammonia water, the right lower port of surface filter is connected with residual ammonia water pipe through residual ammonia water pump, the right upper port of surface filter is connected with ammonia stripping tower through pipeline, and the branch pipe of connecting spray tank is equipped on clear liquid pipe, the outlet of spray tank is connected with the left lower port of surface filter, and the top port and bottom outlet of surface filter are connected with plate and frame filter press respectively, the filtrate outlet of plate and frame filter press is connected with residual ammonia water pipe through pipeline and is located at the front end of residual ammonia water pump, and the filter residue outlet of plate and frame filter press is connected with centralized recovery point.
[0005] In implementation, the surface filter is provided with a right lower port connected with a residual ammonia water pipe through a residual ammonia water pump, and the residual ammonia water pump is provided with one standby; the left and right of the port of the surface filter are only used for identifying the orientation, and not the relative position between the ports; different transformations are adopted for different specifications of the surface filter, and still within the protection scope of the application; the right upper port of the surface filter is connected with an ammonia stripping tower through a pipeline; specifically, the right upper port of the surface filter is connected with the ammonia stripping tower through a clear liquid pipe, and used for conveying the clear liquid to the next process; the clear liquid pipe is provided with a backflush pipe connected with the right upper port of the surface filter, and used for backflushing the surface filter; the clear liquid pipe is provided with a branch pipe connected with a spraying tank, and the outlet of the spraying tank is connected with the left lower port of the surface filter, i.e. the outlet of the spraying tank is connected with the surface filter through a spraying pipe, and the spraying pipe is provided with a pre-spraying pump; the top port and the bottom outlet of the surface filter are respectively connected with plate-and-frame filter presses, the filtrate outlet of the plate-and-frame filter press is connected with the residual ammonia water pipe through a pipeline, and located at the front end of the residual ammonia water pump, and the filter residue outlet of the plate-and-frame filter press is connected with a centralized recovery point.
[0006] Further, the clear liquid pipe and the residual ammonia water pipe are respectively provided with steam pipes near the ports of the surface filter, and used for self-cleaning of the ports and the surface filter.
[0007] Further, the surface filter is provided with three in parallel, i.e. a first surface filter, a second surface filter and a third surface filter; the plate-and-frame filter press includes a first plate-and-frame filter press and a second plate-and-frame filter press; the top port and the bottom outlet of the second surface filter and the third surface filter are connected with the first plate-and-frame filter press; the top port and the bottom outlet of the first surface filter and the top port of the second surface filter are connected with the second plate-and-frame filter press.
[0008] In use, the residual ammonia water from the previous process enters the system through the residual ammonia water pipe under the action of the residual ammonia water pump, and the process of the residual ammonia water is started; the residual ammonia water enters the surface filter from the right lower port, and the trace tar and suspended solids in the residual ammonia water are removed; the clear liquid after removal enters the clear liquid pipe from the right upper port, and enters the next process from the clear liquid pipe, i.e. the ammonia stripping tower.
[0009] After a certain filtration period, the clear liquid pipe shows a decrease in liquid output or an increase in liquid pressure, and the filter membrane of the surface filter shows a decrease in throughput; when backwashing is needed, the clear liquid in the clear liquid pipe enters the surface filter in reverse, and the surface filter is backflushed and cleaned; the backwash liquid after cleaning contains impurities and dirt, and enters the plate-and-frame filter press from the bottom outlet; the impurities and dirt are further separated and treated in the plate-and-frame filter press; the filter residue is collected at the centralized recovery point, and the filtrate is returned to the starting end of the system through the pipeline.
[0010] When pre-spraying is needed, a small part of the clear liquid in the clear liquid pipe enters the spraying tank through the branch pipe, in the spraying tank, the clear liquid is mixed with the spraying material and stirred uniformly, under the action of the pre-spraying pump, the clear liquid after spraying enters the surface filter through the left lower port to pre-spray the filter membrane, and the clear liquid after spraying is discharged from the right upper port of the surface filter.
[0011] When hot steam treatment is needed, steam in the steam pipe enters the surface filter, and the hot steam carrying impurities enters the plate and frame filter press from the top port for further treatment.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] The system for controlling ammonia steam quality of residual ammonia water in circulating ammonia water has lower requirements for water quality indexes, can adapt to a wide water quality fluctuation range, and has excellent compatibility; secondly, the treated effluent water quality is stable and reaches high-standard discharge or reuse indexes, and environmental protection benefits are remarkable; the system adopts full-automatic intelligent control technology, greatly reduces manual management cost; at the same time, the ammonia steam efficiency is significantly improved by optimizing process parameters, and the resource recovery capacity is strengthened; more importantly, the turbidity can be reduced to below 30 NTU. The efficiency is improved by more than 100 times than that of the existing process, the efficient front-end treatment creates an ideal water quality basis for subsequent deep water treatment processes, and ensures that the overall water treatment system runs more economically and efficiently. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a schematic view of the utility model.
[0015] Figure 2 It is Figure 1 It is a partial enlarged view of the surface filter.
[0016] The marks in the figure are as follows: L1-residual ammonia water pipe, L2-clear liquid pipe, L3-branch pipe, L4-backflush pipe, L5-steam pipe, L6-spraying pipe;
[0017] 1-surface filter, b-top port, c-right lower port, d-right upper port, e-bottom outlet, f-left lower port,
[0018] 2-spraying tank, 3-residual ammonia water pump, 4-ammonia steam tower, 5-pre-spraying pump, 6-plate and frame filter press. DETAILED DESCRIPTION
[0019] The specific embodiments of the utility model will be described below in combination with the drawings.
[0020] A system for controlling ammonia steam quality of residual ammonia water in circulating ammonia water, as Figure 1 , 2As shown, including surface filter 1, 120-NBP-H is used in this embodiment, the tank size is 2500x4800, the left and right of the port of the surface filter in this application are only used for the orientation of the port in the figure, that is, only the position in the figure, not the relative position between the ports, different deformations are used for different sizes of surface filters, which are still within the protection scope of this application, the surface filter 1 is provided with three, the three surface filters 1 are completely consistent in structure, which are respectively the first surface filter, the second surface filter and the third surface filter, the three surface filters 1 are used alternately to ensure the normal operation of the system, when one surface filter 1 is being backwashed and pre-sprayed, the remaining surface filters 1 can still be used for remaining ammonia water treatment.
[0021] The right lower port c of the surface filter 1 is connected with the remaining ammonia water pipe L1 through the remaining ammonia water pump 3, the remaining ammonia water pipe L1 is divided into three remaining ammonia water branch pipes through a remaining ammonia water main pipe from the previous process, and the three remaining ammonia water branch pipes are connected with the first surface filter, the second surface filter and the third surface filter respectively, the remaining ammonia water pump 3 is provided with two, one of which is used as a backup to ensure the normal operation of the system.
[0022] The right upper port d of the surface filter 1 is connected with the ammonia evaporation tower 4 through the clear liquid pipe L2, which is used for clear liquid delivery to the next process, the clear liquid pipe L2 includes three clear liquid branch pipes connected with the three surface filters 1, that is, a clear liquid main pipe after the clear liquid branch pipes converge, a valve is arranged on each clear liquid branch pipe, the clear liquid pipe L2 is provided with a backflush pipe L4 connected with the right upper port d of the surface filter 1, and the backflush pipe L4 is arranged behind the valve of each clear liquid branch pipe; the clear liquid pipe L2 is provided with a branch pipe L3 connected with the spraying tank 2, the branch pipe L3 is arranged on the clear liquid main pipe, and the branch pipe is divided into two paths each connected with the spraying tank 2, the spraying tank 2 uses one as a backup, and both are made of stirring tanks for pre-spraying, the outlet of the spraying tank 2 is connected with the left lower port f of the surface filter 1 through the spraying pipe L6, a pre-spraying pump 5 is arranged on each of the two spraying pipes L6, and the top port b and the bottom outlet e of the surface filter 1 are connected with the plate-and-frame filter press 6, the plate-and-frame filter press 6 includes a first plate-and-frame filter press and a second plate-and-frame filter press, the top port b and the bottom outlet e of the second surface filter and the third surface filter are connected with the first plate-and-frame filter press, the top port b and the bottom outlet e of the first surface filter and the top port b of the second surface filter are connected with the second plate-and-frame filter press, and the filtrate outlet of the plate-and-frame filter press 6 is connected with the remaining ammonia water pipe L1 through a pump pipe, and is located at the front end of the remaining ammonia water pump 3, and the filter residue outlet of the plate-and-frame filter press 6 is connected with a centralized recovery point.
[0023] Preferably, the clear liquid pipe L2 and the remaining ammonia water pipe L1 are respectively provided with steam pipes L5 near the ports of the surface filter 1, which are used for self-cleaning function of the ports and the surface filter 1.
[0024] In use, the remaining ammonia water from the previous process enters the system through the remaining ammonia water pipe L1 under the action of the remaining ammonia water pump 3, starting the remaining ammonia water treatment process, and the remaining ammonia water enters the surface filter 1 from the right lower port c to remove the trace tar and suspended solids in the remaining ammonia water, and the clean liquid after removal enters the clean liquid pipe L2 from the right upper port d and then enters the next process, i.e., the ammonia distillation tower 4.
[0025] After a certain filtration period, the clean liquid pipe L2 output decreases, or the liquid inlet pressure increases, the filter membrane throughput of the surface filter 1 decreases, and the clean liquid in the clean liquid pipe L2 reversely enters the surface filter 1 to clean the surface filter 1 when backwashing is required, and the backwash liquid after cleaning contains impurities and dirt, which enters the plate and frame filter press 6 from the bottom outlet e, and the impurities and dirt are further separated and treated in the plate and frame filter press 6, the filter residue is concentrated and recovered, and the filtrate is returned to the starting end of the system through the pipeline.
[0026] When pre-spraying is required, a small part of the clean liquid in the clean liquid pipe L2 enters the spraying tank 2 through the branch pipe L3, and in the spraying tank 2, the clean liquid is mixed and stirred with the spraying material, and under the action of the pre-spraying pump 5, the clean liquid enters the surface filter 1 from the left lower port f through the spraying pipe L6 to pre-spray the filter membrane, and the clean liquid after spraying is discharged from the surface filter 1 from the right upper port d.
[0027] When hot steam treatment is required, the steam in the steam pipe L5 enters the surface filter 1, and the hot steam carrying impurities enters the plate and frame filter press 6 from the top port b for further treatment.
[0028] The clean liquid is taken for detection, and the turbidity is reduced to 30 NTU or less, and the existing process can reach 2000 NTU at most, and the efficiency is improved by dozens of times.
[0029] The scope of protection of the utility model is not limited to the above specific embodiments, and for those skilled in the art, the utility model can have various modifications and changes, and any modification, improvement and equivalent replacement within the concept and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A system for controlling the quality of the stripping of ammonia from recycled ammonia water, comprising a surface filter (1), characterised in that: The right lower port (c) of the surface filter (1) is connected with the residual ammonia water pipe (L1) through the residual ammonia water pump (3), the right upper port (d) of the surface filter (1) is connected with the ammonia stripping tower (4) through the clear liquid pipe (L2), the branch pipe (L3) connected with the spraying tank (2) is arranged on the clear liquid pipe (L2), the outlet of the spraying tank (2) is connected with the left lower port (f) of the surface filter (1), the top port (b) and the bottom outlet (e) of the surface filter (1) are respectively connected with the plate-and-frame filter press (6), the filtrate outlet of the plate-and-frame filter press (6) is connected with the residual ammonia water pipe (L1) through the pipeline and is located at the front end of the residual ammonia water pump (3), and the filter residue outlet of the plate-and-frame filter press (6) is connected with the centralized recovery point.
2. The system for controlling the quality of the ammonia stripping of the residual ammonia water in the circulating ammonia water according to claim 1, characterized in that: The backflush pipe (L4) connected with the right upper port (d) of the surface filter (1) is arranged on the clear liquid pipe (L2).
3. The system for controlling the quality of the ammonia stripping of the residual ammonia water in the circulating ammonia water according to claim 1, characterized in that: Three surface filters are arranged in parallel, which are the first surface filter, the second surface filter and the third surface filter.
4. The system for controlling the quality of the ammonia stripping of the residual ammonia water in the circulating ammonia water according to claim 3, characterized in that: The plate-and-frame filter press (6) comprises a first plate-and-frame filter press and a second plate-and-frame filter press, the top port (b) and the bottom outlet (e) of the second surface filter and the third surface filter are connected with the first plate-and-frame filter press, the top port (b) and the bottom outlet (e) of the first surface filter and the top port (b) of the second surface filter are connected with the second plate-and-frame filter press.
5. The system for controlling the quality of the ammonia stripping of the residual ammonia water in the circulating ammonia water according to claim 1, characterized in that: The outlet of the spraying tank (2) is connected with the surface filter (1) through the spraying pipe (L6), and the pre-spraying pump (5) is arranged on the spraying pipe (L6).
6. The system for controlling the quality of the ammonia stripping of the residual ammonia water in the circulating ammonia water according to claim 1, characterized in that: The residual ammonia water pump (3) is provided with one spare.
7. The system for controlling the quality of the ammonia stripping of the residual ammonia water in the circulating ammonia water according to claim 1, characterized in that: The steam pipe (L5) is arranged on the clear liquid pipe (L2) and the residual ammonia water pipe (L1) near the port of the surface filter (1).