Ammonia-containing wastewater and ammonia-containing waste gas treatment system in production process of combined-soda process
By designing a treatment system for ammonia-containing wastewater and ammonia-containing waste gas in the production process of the coal alkali process, and using the combined treatment technology of the spray tower and the ammonia-evaporated tower, the problem of difficult treatment of ammonia-containing wastewater and waste gas in the coal alkali process is solved, and resource recycling and environmental protection are achieved.
Patent Information
- Application Number
- CN202420837529.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-04-22
AI Technical Summary
The ammonia-containing wastewater and ammonia-containing waste gas generated during the production process of the alkaline process are difficult to effectively treat, resulting in environmental pollution and waste of resources.
A treatment system is designed, including an ammonia-containing waste gas collection pipeline and an ammonia-containing wastewater collection pool, which absorbs ammonia through the spray tower, and then evaporates and recycles them through the ammonia evaporates the ammonia tower, and finally discharges or reuses the wastewater and waste gas to meet the standards.
It effectively reduces ammonia waste and environmental pollution, achieves the compliance treatment of wastewater and waste gas, and recycles and utilizes useful ammonia resources.
Smart Images
Figure CN222641632U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a system for treating ammonia-containing wastewater and ammonia-containing waste gas in a production process of a combined alkali process. Background Art
[0002] Liquid ammonia is used as raw material in the production process of the combined alkali process. Some equipment in the production unit, such as the mother liquor barrel and wet ammonia belt, will volatilize ammonia, and the carbonization tower and calcining furnace will also produce ammonia-containing tail gas. The emission of ammonia-containing gas will not only cause physical damage to the operators, but also pose certain risks of fire and explosion. In addition, the emission of a large amount of ammonia into the environment will also cause a series of problems such as eutrophication of water bodies and air pollution. At the same time, due to the short operation cycle of the combined alkali carbonization tower and the cold salting crystallizer, serious corrosion of equipment and pipelines, and fluctuations in the production process, the mother liquor is easily expanded, resulting in the combined alkali process producing ammonia-containing wastewater due to the expansion of the mother liquor. In order to prevent ammonia-containing waste gas and ammonia-containing wastewater from polluting the environment, it is urgent to treat and recycle the pollutants therein. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process in view of the deficiencies of the prior art, so as to effectively treat the wastewater and ammonia-containing waste gas so as to meet the discharge standards or be reused.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a system for treating ammonia-containing wastewater and ammonia-containing waste gas in a joint alkali process production process, comprising an ammonia-containing waste gas collection pipeline and an ammonia-containing waste water collection pool, the ammonia-containing waste gas is connected to the ammonia-containing waste gas collection pipeline, the ammonia-containing waste water is connected to the ammonia-containing waste water collection pool, the ammonia-containing waste gas collection pipeline is connected to the inlet of a spray tower, the liquid outlet of the spray tower is connected to the water inlet of the ammonia-containing waste water collection pool, the water outlet of the ammonia-containing waste water collection pool is connected to a first heat exchanger, the first heat exchanger is connected to a tower bottom heat exchanger, the tower bottom heat exchanger is connected to an ammonia evaporation tower, the top of the ammonia evaporation tower is respectively connected to a cooling water source and an ammonia absorber, the ammonia absorber is connected to a mother liquor barrel, the bottom of the ammonia evaporation tower is respectively connected to a low-pressure steam source and a tower bottom heat exchanger, the tower bottom heat exchanger is connected to a second heat exchanger, and the second heat exchanger is connected to a recycling device.
[0005] Optionally, the water outlet of the ammonia-containing wastewater collection tank is connected to the first heat exchanger via a first water pump.
[0006] Optionally, the bottom of the ammonia distillation tower is connected to a bottom heat exchanger via a second water pump.
[0007] Optionally, the second heat exchanger is connected to a third water pump, and the third pump is connected to a recycling device through a pipeline.
[0008] Optionally, the tower bottom heat exchanger, the first heat exchanger and the second heat exchanger are all plate heat exchangers or shell and tube heat exchangers, and a heating medium for heating the fluid is installed inside.
[0009] Optionally, a packing layer is arranged in the middle of the ammonia evaporation tower from top to bottom, and a condensation section is arranged at the top of the ammonia evaporation tower, and the condensation section is connected to a cooling water source.
[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0011] The utility model is based on the above system to treat ammonia-containing wastewater and ammonia-containing waste gas generated in the production process of the combined alkali process. The ammonia concentration in these wastewater and waste gas is not high, but direct discharge does not meet the standards and will cause environmental pollution. Therefore, after reasonable treatment through this system, useful substances can be reused and the discharged wastewater or waste gas can meet the standards, which has high practical value.
[0012] In the utility model, the ammonia-containing waste gas enters the spray tower, the ammonia in it is absorbed by water to become an absorption liquid, and the ammonia-containing absorption liquid enters the ammonia-containing waste water collection pool and is treated together with the ammonia-containing waste water. Since the ammonia concentration in the ammonia-containing waste gas is low, after spray absorption, the ammonia nitrogen content of the waste gas can directly meet the discharge standards. The ammonia-containing wastewater in the ammonia-containing wastewater collection pool is pumped out by the first water pump, sent to the first heat exchanger for heat exchange, and then heat exchanged and heated again in the bottom heat exchanger, and enters the tower from the middle of the ammonia still tower, passing through each packing layer from top to bottom, increasing the gas-liquid contact surface, making them intensively mixed with each other, and making the free ammonia therein fully volatilize; at the same time, low-pressure steam enters from the bottom of the ammonia still tower, fully raising the tower body temperature, making the free ammonia in the ammonia-containing wastewater volatilize, and the volatilized ammonia enters the ammonia absorber from the top of the tower to be absorbed by the mother liquor, and refluxes into the mother liquor barrel; the waste liquid after ammonia evaporation is pumped out from the bottom of the ammonia still tower by the second water pump, and after heat exchange and temperature increase in the bottom heat exchanger and the second heat exchanger in turn, it is sent to the reuse equipment of each required position or discharged externally by the third water pump.
[0013] This system can recycle ammonia in ammonia-containing wastewater and ammonia-containing waste gas, effectively reducing the waste of ammonia produced and vented and reducing the impact on the outside world. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0015] Figure 1 : A schematic diagram of the structure of a system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process of the utility model;
[0016] Among them, 1. Spray tower; 2. Ammonia wastewater collection pool; 3. First water pump; 4. First heat exchanger; 5. Bottom heat exchanger; 6. Ammonia evaporation tower; 7. Ammonia absorber; 8. Mother liquor barrel; 9. Second water pump; 10. Second heat exchanger; 11. Third water pump; 12. Recycling equipment. DETAILED DESCRIPTION
[0017] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.
[0018] The use of words such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and cannot be understood as limiting the present invention.
[0020] like Figure 1 As shown, a system for treating ammonia-containing wastewater and ammonia-containing waste gas in a joint alkali process production process includes an ammonia-containing waste gas collecting pipeline and an ammonia-containing waste water collecting pool 2, wherein the ammonia-containing waste gas is connected to the ammonia-containing waste gas collecting pipeline, the ammonia-containing waste water is connected to the ammonia-containing waste water collecting pool 2, the ammonia-containing waste gas collecting pipeline is connected to the gas inlet of a spray tower 1, the liquid outlet of the spray tower 1 is connected to the water inlet of the ammonia-containing waste water collecting pool 2, the water outlet of the ammonia-containing waste water collecting pool 2 is connected to the first heat exchanger 4, the first heat exchanger 4 is connected to the bottom heat exchanger 5, the bottom heat exchanger 5 is connected to the ammonia evaporation tower 6, the top of the ammonia evaporation tower 6 is respectively connected to a cooling water source and an ammonia absorber 7, the ammonia absorber 7 is connected to a mother liquor barrel 8, the bottom of the ammonia evaporation tower 6 is respectively connected to a low-pressure steam source and the bottom heat exchanger 5, the bottom heat exchanger 5 is connected to the second heat exchanger 10, and the second heat exchanger 10 is connected to a recycling device 12.
[0021] In the utility model, the spray tower 1 can select a circulating water spray tower 1. When the ammonia-containing waste gas enters from the bottom of the spray tower 1, it contacts with the water sprayed from the spray tower 1. After contact, the ammonia in the ammonia-containing waste gas is dissolved in the water. The dilute ammonia water that absorbs ammonia circulates and contacts with the ammonia-containing waste gas, and is finally discharged from the bottom of the spray tower 1. The ammonia-containing waste gas enters the spray tower 1, and the ammonia therein is absorbed by the water to become an absorption liquid. The ammonia-containing absorption liquid enters the ammonia-containing waste water collection pool 2 and is combined with the ammonia-containing waste water for treatment. Since the ammonia concentration in the ammonia-containing waste gas is low, after spray absorption, the ammonia nitrogen content of the waste gas can directly meet the discharge standards.
[0022] In some specific embodiments, the water outlet of the ammonia-containing wastewater collection tank 2 is connected to the first heat exchanger 4 through the first water pump 3 .
[0023] In some specific embodiments, the bottom of the ammonia distillation tower 6 is connected to the bottom heat exchanger 5 via a second water pump 9 .
[0024] In some specific embodiments, the second heat exchanger 10 is connected to the third water pump 11 , and the third pump is connected to the recycling device 12 through a pipeline.
[0025] In some specific embodiments, the tower bottom heat exchanger 5, the first heat exchanger 4 and the second heat exchanger 10 are all plate heat exchangers or shell and tube heat exchangers, and a heating medium for heating the fluid is installed inside.
[0026] In some specific embodiments, a packing layer is arranged from top to bottom in the middle of the ammonia still 6, and a condensation section is arranged at the top of the ammonia still 6, and the condensation section is connected to a cooling water source. A packing is arranged in the packing layer, and the packing is an inert solid material, such as a ball ring and a Raschig ring, etc., and its function is to increase the contact surface between gas and liquid so that they are strongly mixed with each other.
[0027] Thus, the ammonia-containing wastewater in the ammonia-containing wastewater collection pool 2 is pumped out by the first water pump 3, sent to the first heat exchanger 4 for heat exchange, and then heat exchanged and heated again by the bottom heat exchanger 5, enters the ammonia evaporation tower 6 from the middle of the tower, passes through each packing layer from top to bottom, increases the gas-liquid contact surface, makes them intensively mixed with each other, and makes the free ammonia therein fully volatilize; at the same time, low-pressure steam enters from the bottom of the ammonia evaporation tower 6, fully increases the tower body temperature, makes the free ammonia in the ammonia-containing wastewater volatilize, and the volatilized ammonia enters the ammonia absorber 7 from the top of the tower to be absorbed by the mother liquor, and flows back into the mother liquor barrel 8; the waste liquid after the ammonia evaporates is pumped out from the bottom of the ammonia evaporation tower 6 by the second water pump 9, and after heat exchange and temperature increase by the bottom heat exchanger 5 and the second heat exchanger 10 in turn, is sent to the reuse equipment 12 of each required position or discharged by the third water pump 11.
[0028] After being treated by this system, the ammonia nitrogen concentration in the ammonia-containing wastewater is lower than 12 mg / L, and the ammonia (NH 3 ) The hourly average concentration is less than 18 mg / m 3The treatment efficiency is above 85%, and it can be reused as needed or discharged in compliance with discharge standards.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.
[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process, characterized in that: It includes an ammonia-containing waste gas collection pipeline and an ammonia-containing wastewater collection pool, the ammonia-containing waste gas is connected to the ammonia-containing waste gas collection pipeline, the ammonia-containing wastewater is connected to the ammonia-containing wastewater collection pool, the ammonia-containing waste gas collection pipeline is connected to the inlet of the spray tower, the liquid outlet of the spray tower is connected to the water inlet of the ammonia-containing wastewater collection pool, the water outlet of the ammonia-containing wastewater collection pool is connected to the first heat exchanger, the first heat exchanger is connected to the bottom heat exchanger, the bottom heat exchanger is connected to the ammonia evaporation tower, the top of the ammonia evaporation tower is respectively connected to the cooling water source and the ammonia absorber, the ammonia absorber is connected to the mother liquor barrel, the bottom of the ammonia evaporation tower is respectively connected to the low-pressure steam source and the bottom heat exchanger, the bottom heat exchanger is connected to the second heat exchanger, and the second heat exchanger is connected to the recycling equipment.
2. A system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process as claimed in claim 1, characterized in that: The water outlet of the ammonia-containing wastewater collection pool is connected to the first heat exchanger through a first water pump.
3. A system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process as claimed in claim 2, characterized in that: The bottom of the ammonia distillation tower is connected to the bottom heat exchanger via a second water pump.
4. A system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process as claimed in claim 3, characterized in that: The second heat exchanger is connected to a third water pump, and the third water pump is connected to a recycling device through a pipeline.
5. A system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process as claimed in claim 4, characterized in that: The tower bottom heat exchanger, the first heat exchanger and the second heat exchanger are all plate heat exchangers or shell and tube heat exchangers, and a heating medium for heating the fluid is installed inside.
6. A system for treating ammonia-containing wastewater and ammonia-containing waste gas in a combined alkali process production process as claimed in claim 5, characterized in that: A packing layer is arranged in the middle of the ammonia evaporation tower from top to bottom, and a condensation section is arranged on the top of the ammonia evaporation tower, and the condensation section is connected to a cooling water source.