Novel deamination evaporation system

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a novel deamination evaporation system. According to the technical scheme, the system comprises a feeding tank for storing ammonia nitrogen wastewater; the plurality of preheaters are used for preheating the ammonia nitrogen wastewater; the plurality of evaporators are used for evaporating the ammonia-nitrogen wastewater; the plurality of gas-liquid separators are used for separating the evaporated ammonia-nitrogen wastewater from steam, and the gas-liquid separators are positioned in the evaporator; the first absorption mechanism and the second absorption mechanism are used for absorbing ammonia gas. The ammonia-nitrogen wastewater treatment device has the beneficial effects that the ammonia-nitrogen wastewater is heated step by step by arranging a plurality of evaporators, and ammonia nitrogen and water in the wastewater are separated by utilizing an evaporation concentration and deamination process, so that the concentration of the ammonia nitrogen in the wastewater is reduced, and the aims of environment-friendly emission standard or recycling are fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a novel deammoniation evaporation system. Background Art

[0002] Ammonia nitrogen wastewater mainly contains pollutants such as ammonia nitrogen and organic matter. Ammonia nitrogen refers to the sum of ammonia nitrogen converted from free and bound ammonia in water through chemical reactions, generally expressed as NH3-N. Ammonia nitrogen dissolves in water to form ammonia gas and ammonium ions, which have a pungent odor and are toxic to organisms and humans.

[0003] Ammonia nitrogen wastewater is extremely harmful and will have a serious impact on the environment and human health. On the one hand, ammonia nitrogen is an important substance for eutrophication of water bodies and environmental pollution. It is easy to cause algae and other microorganisms to multiply in large numbers in the water, leading to deterioration of water quality. In severe cases, it will cause a decrease in dissolved oxygen in the water, a large number of fish to die, and even cause the lake to dry up and die. On the other hand, ammonia nitrogen will also increase the amount of chlorine used in the process of water disinfection and industrial circulating water sterilization. It is corrosive to certain metals (such as copper) and affects the normal operation of equipment. When sewage is reused, ammonia nitrogen in the recycled water can promote the reproduction of microorganisms in water pipelines and water-using equipment, form bioscaling, block pipelines and water-using equipment, and affect heat exchange efficiency.

[0004] In order to meet this challenge, governments around the world have strengthened the supervision of wastewater discharge and issued a series of strict environmental protection laws and standards. Driven by these laws and regulations, traditional ammonia nitrogen wastewater treatment technology has been unable to meet the existing environmental protection requirements. Therefore, the research and development and application of new deammonification evaporation systems have become particularly important. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art, provide a novel deammonification evaporation system, and solve the problem that the existing ammonia nitrogen wastewater treatment technology is difficult to meet the existing environmental protection requirements.

[0006] The utility model provides a novel deammonification evaporation system, and its technical scheme is as follows: comprising: a feed tank for storing ammonia nitrogen wastewater; a plurality of preheaters for preheating the ammonia nitrogen wastewater, the preheaters being connected to the feed tank through a pipeline; a plurality of evaporators for evaporating the ammonia nitrogen wastewater, the evaporators being connected to the preheaters through a pipeline; a plurality of gas-liquid separators for separating evaporated ammonia nitrogen wastewater and steam, the gas-liquid separators being located in the evaporators; a first absorption mechanism and a second absorption mechanism for absorbing ammonia gas, the first absorption mechanism and the second absorption mechanism being connected to the evaporator through a pipeline.

[0007] Furthermore, the preheater includes a primary preheater and a secondary preheater connected end to end through a pipeline, and the primary preheater is connected to the feed tank through a pipeline.

[0008] Furthermore, the evaporator comprises a first-effect evaporator, a second-effect evaporator and a third-effect evaporator which are sequentially connected end to end through pipelines, and the first-effect evaporator is connected to the secondary preheater through a pipeline.

[0009] Furthermore, the first-effect evaporator is connected to water vapor through a pipeline.

[0010] Furthermore, the gas-liquid separator includes a first gas-liquid separator and a second gas-liquid separator, the first gas-liquid separator is located in the first-effect evaporator, the second gas-liquid separator is located in the second-effect evaporator, and the third-effect evaporator is connected to the second gas-liquid separator through a pipeline.

[0011] Furthermore, it also includes a first compressor and a second compressor, the first compressor is connected to the first gas-liquid separator through a pipeline, the second compressor is connected to the second gas-liquid separator through a pipeline, and the first compressor and the second compressor are interconnected through a pipeline; the first compressor is connected to the first-effect evaporator, the second-effect evaporator and the third-effect evaporator through a pipeline.

[0012] Furthermore, the first absorption mechanism includes a first washing tower and a first ammonia separator connected by a pipeline, and the first absorption mechanism is located on the pipeline between the first compressor and the first-effect evaporator and the second-effect evaporator.

[0013] Furthermore, it also includes a condenser for recovering energy from low-temperature steam, and the condenser is connected to the gas-liquid separator and the secondary preheater through a pipeline.

[0014] Furthermore, it also includes a dirty condensed water tank, which is connected to the condenser, the evaporator and the primary preheater through a pipeline.

[0015] Furthermore, the second absorption mechanism includes a second washing tower and a second ammonia separator connected by a pipeline, and the second absorption mechanism is located on the pipeline between the dirty condensed water tank and the evaporator.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] By setting up multiple evaporators, the ammonia nitrogen wastewater is heated step by step, and the evaporation concentration and deammoniation process is used to separate the ammonia nitrogen and water in the wastewater, thereby reducing the concentration of ammonia nitrogen in the wastewater and achieving environmental protection emission standards or recycling and reuse.

[0018] This system has a short route and a small number of effects.

[0019] The processing equipment has a long continuous operation cycle, few transmission parts, simple main equipment, and few consumables, which greatly facilitates future maintenance, has low cost, takes up little space, and saves financial, material and human resources.

[0020] The first compressor and the second compressor adopt MVR technology, which can compress and recycle all secondary steam, greatly saving steam energy.

[0021] This process adopts reduced pressure MVR evaporation, the vacuum system is small, and the consumption of circulating cooling water is greatly reduced.

[0022] Simple, convenient and easy to clean.

[0023] This system has low operating cost, high energy utilization rate and high economic benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a system schematic diagram of a novel deammoniation evaporation system of the utility model.

[0025] Legend: 1. Feed tank; 2. Preheater; 21. Primary preheater; 22. Secondary preheater; 3. Evaporator; 31. First-effect evaporator; 32. Second-effect evaporator; 33. Third-effect evaporator; 4. Gas-liquid separator; 41. First gas-liquid separator; 42. Second gas-liquid separator; 5. Compressor; 51. First compressor; 52. Second compressor; 6. Washing tower; 61. First washing tower; 62. Second washing tower; 7. Ammonia separator; 71. First ammonia separator; 72. Second ammonia separator; 8. Suction booster pump; 9. Condenser. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] See also Figure 1 The utility model provides a novel deammonification evaporation system to solve the problem that the existing ammonia nitrogen wastewater treatment technology is difficult to meet the existing environmental protection requirements.

[0028] See also Figure 1 , showing a schematic diagram of a novel deamination evaporation system of the utility model. Figure 1 , a novel deammoniation evaporation system of the utility model is described.

[0029] like Figure 1As shown, a novel deammonification evaporation system of the utility model comprises: a feed tank 1 for storing ammonia nitrogen wastewater; a plurality of preheaters for preheating the ammonia nitrogen wastewater, the preheaters being connected to the feed tank 1 through a pipeline; a plurality of evaporators for evaporating the ammonia nitrogen wastewater, the evaporators being connected to the preheaters through a pipeline; a plurality of gas-liquid separators for separating the evaporated ammonia nitrogen wastewater and steam, the gas-liquid separators being located in the evaporators; a first absorption mechanism and a second absorption mechanism for absorbing ammonia gas, the first absorption mechanism and the second absorption mechanism being connected to the evaporator through a pipeline.

[0030] In a specific embodiment, the preheater includes a primary preheater 21 and a secondary preheater 22 connected end to end via a pipeline, and the primary preheater 21 is connected to the feed tank 1 via a pipeline.

[0031] In a specific embodiment, the evaporator includes a first-effect evaporator 31, a second-effect evaporator 32 and a third-effect evaporator 33 which are sequentially connected end to end through pipelines, and the first-effect evaporator 31 is connected to the secondary preheater 22 through a pipeline.

[0032] In a specific embodiment, the first-effect evaporator 31 is connected to fresh water vapor through a pipeline.

[0033] In a specific embodiment, the gas-liquid separator includes a first gas-liquid separator 41 and a second gas-liquid separator 42, wherein the first gas-liquid separator 41 is located in the first-effect evaporator 31, the second gas-liquid separator 42 is located in the second-effect evaporator 32, and the third-effect evaporator 33 is connected to the second gas-liquid separator 42 through a pipeline. The second-effect evaporator 32 and the third-effect evaporator 33 share the second gas-liquid separator 42.

[0034] In a specific embodiment, it also includes a first compressor 51 and a second compressor 52, the first compressor 51 is connected to the first gas-liquid separator 41 through a pipeline, the second compressor 52 is connected to the second gas-liquid separator 42 through a pipeline, and the first compressor 51 and the second compressor 52 are connected to each other through the pipeline;

[0035] The first compressor 51 is connected to the first-effect evaporator 31 , the second-effect evaporator 32 , and the third-effect evaporator 33 through pipelines.

[0036] In a specific embodiment, the first absorption mechanism includes a first washing tower 61 and a first ammonia separator 71 connected by a pipeline, and the first absorption mechanism is located on the pipeline between the first compressor 51 and the first effect evaporator 31 and the second effect evaporator 32. The first washing tower 61 and the first ammonia separator 71 can absorb and filter the residual ammonia in the secondary steam, thereby ensuring the safety of the equipment and the environment.

[0037] In a specific embodiment, a condenser 9 for recovering energy from low-temperature steam is further included, and the condenser 9 is connected to the gas-liquid separator and the secondary preheater 22 through a pipeline.

[0038] In a specific embodiment, a dirty condensed water tank is further included, and the dirty condensed water tank is connected to the condenser 9, the evaporator and the primary preheater 21 through a pipeline. The secondary condensed water generated by the evaporator is stored in the dirty condensed water tank through a pipeline and transmitted to the primary preheater 21 for recycling.

[0039] In a specific embodiment, the second absorption mechanism includes a second washing tower 62 and a second ammonia separator 72 connected by a pipeline, and the second absorption mechanism is located on the pipeline between the dirty condensed water tank and the evaporator. The second washing tower 62 and the second ammonia separator 72 can filter the residual ammonia in the secondary condensed water, ensuring the safety of the equipment and the environment.

[0040] In a specific embodiment, the three evaporators are forced falling film evaporators.

[0041] In a specific embodiment, the evaporator is provided with a circulation pump, a heat exchange chamber and an evaporation chamber. The circulation pump transfers the ammonia nitrogen wastewater into the heat exchange chamber and heats the ammonia nitrogen wastewater by injecting water vapor into the heat exchange chamber. Due to the high pressure in the heat exchange chamber, the boiling point of the ammonia nitrogen wastewater in the heat exchange chamber will increase, resulting in an excessively high temperature of the ammonia nitrogen wastewater. After the overheated ammonia nitrogen wastewater enters the evaporation chamber, the pressure of the ammonia nitrogen wastewater drops rapidly, causing part of the ammonia nitrogen wastewater to flash or boil rapidly.

[0042] In a specific embodiment, the triple-effect evaporator 33 is provided with a discharge port.

[0043] In a specific embodiment, the first compressor 51 and the second compressor 52 are MVR compressors. The MVR compressor increases the pressure and temperature of the secondary steam and then retransmits it to the evaporator for use as a heat source, thereby improving energy efficiency.

[0044] In a specific embodiment, it further comprises an air suction booster pump 8, which is located on the pipeline between the first compressor 51 and the triple-effect evaporator 33. The air suction booster pump 8 can further increase the heat of the secondary steam.

[0045] Furthermore, the air suction boost pump 8 is a TVR air suction boost pump.

[0046] In a specific embodiment, it also includes a vacuum system arranged on the secondary preheater 22, and the vacuum system can generate negative pressure in the condenser 7, so that the condenser 7 can suck out the non-condensable gas in the evaporator, condense the residual water vapor in the non-condensable gas into water, and then transfer it to the dirty condensed water tank for storage and recycling; while the non-condensable gas is discharged through the vacuum system to prevent it from affecting the evaporation efficiency.

[0047] The following is a detailed description of the use process of a novel deammoniation evaporation system of the utility model.

[0048] like Figure 1 As shown, a novel deamination evaporation system of the utility model has the following use process:

[0049] The ammonia nitrogen wastewater is poured into the feed tank 1, and the ammonia nitrogen wastewater enters the primary preheating tank 21 through a pipeline for preliminary heating, and then enters the secondary preheating tank 22 through a pipeline for secondary heating.

[0050] The ammonia nitrogen wastewater that has been heated twice enters the heat exchange chamber of the first-effect evaporator 31 through a pipeline, and water vapor is poured into the heat exchange chamber through a pipeline to heat the ammonia nitrogen wastewater. Due to the high pressure in the heat exchange chamber, the boiling point of the ammonia nitrogen wastewater in the heat exchange chamber will increase, which will cause the ammonia nitrogen wastewater to overheat. After the overheated ammonia nitrogen wastewater enters the evaporation chamber, the pressure of the ammonia nitrogen wastewater drops rapidly, causing part of the ammonia nitrogen wastewater to flash or boil rapidly.

[0051] The first gas-liquid separator 41 separates the high-temperature ammonia nitrogen wastewater and the secondary steam generated by flash evaporation, and transmits the separated secondary steam to the first compressor 51 through a pipeline. The first compressor 51 performs high-temperature pressurization treatment on the secondary steam, and injects the treated secondary steam into the first-effect evaporator 31 and the second-effect evaporator 32 as a heat source. At the same time, the secondary steam passes through the first washing tower 61 and the first ammonia separator 71, so as to absorb and filter the ammonia in the secondary steam.

[0052] The steam heated by the first compressor 51 can also enter the three-effect evaporator 33 through a pipeline, and the secondary steam is further heated by the suction booster pump 8.

[0053] After the ammonia nitrogen wastewater is concentrated by three evaporations in three evaporators, the ammonia nitrogen wastewater is discharged from the discharge port on the three-effect evaporator 33 .

[0054] The utility model is described in detail above in conjunction with the embodiments of the drawings. A person skilled in the art can make various variations of the utility model according to the above description. Therefore, some details in the embodiments should not constitute a limitation of the utility model, and the scope of protection of the utility model shall be defined by the scope of the attached claims.

Claims

1. A new type of deamination evaporation system, characterized by: include: A feed tank (1) for storing ammonia nitrogen wastewater; A plurality of preheaters for preheating the ammonia nitrogen wastewater, wherein the preheaters are connected to the feed tank (1) via pipelines; A plurality of evaporators for evaporating ammonia nitrogen wastewater, wherein the evaporators are connected to the preheater through pipelines; A plurality of gas-liquid separators for separating evaporated ammonia nitrogen wastewater and steam, wherein the gas-liquid separators are located inside the evaporator; A first absorption mechanism and a second absorption mechanism for absorbing ammonia, wherein the first absorption mechanism and the second absorption mechanism are connected to the evaporator through a pipeline.

2. A novel deamination evaporation system according to claim 1, characterized in that: The preheater comprises a primary preheater (21) and a secondary preheater (22) connected end to end via a pipeline, and the primary preheater (21) is connected to the feed tank (1) via a pipeline.

3. A novel deamination evaporation system according to claim 2, characterized in that: The evaporator comprises a first-effect evaporator (31), a second-effect evaporator (32) and a third-effect evaporator (33) which are connected end to end in sequence through pipelines, and the first-effect evaporator (31) is connected to the secondary preheater (22) through a pipeline.

4. A novel deamination evaporation system according to claim 3, characterized in that: The first-effect evaporator (31) is connected to water vapor via a pipeline.

5. A novel deamination evaporation system according to claim 3, characterized in that: The gas-liquid separator comprises a first gas-liquid separator (41) and a second gas-liquid separator (42), wherein the first gas-liquid separator (41) is located in the first-effect evaporator (31), the second gas-liquid separator (42) is located in the second-effect evaporator (32), and the third-effect evaporator (33) is connected to the second gas-liquid separator (42) via a pipeline.

6. A novel deamination evaporation system according to claim 5, characterized in that: The system further comprises a first compressor (51) and a second compressor (52), wherein the first compressor (51) is connected to the first gas-liquid separator (41) via a pipeline, and the second compressor (52) is connected to the second gas-liquid separator (42) via a pipeline, and the first compressor (51) and the second compressor (52) are connected to each other via the pipeline; The first compressor (51) is connected to the first-effect evaporator (31), the second-effect evaporator (32) and the third-effect evaporator (33) through pipelines.

7. A novel deamination evaporation system according to claim 6, characterized in that: The first absorption mechanism comprises a first washing tower (61) and a first ammonia separator (71) connected by a pipeline, and the first absorption mechanism is located on the pipeline between the first compressor (51) and the first-effect evaporator (31) and the second-effect evaporator (32).

8. A novel deamination evaporation system according to claim 2, characterized in that: It also includes a condenser (9) for recovering energy from low-temperature steam, and the condenser (9) is connected to the gas-liquid separator and the secondary preheater (22) through a pipeline.

9. A novel deamination evaporation system according to claim 8, characterized in that: It also includes a dirty condensed water tank, which is connected to the condenser (9), the evaporator and the primary preheater (21) through a pipeline.

10. A novel deamination evaporation system according to claim 9, characterized in that: The second absorption mechanism comprises a second washing tower (62) and a second ammonia separator (72) connected by a pipeline, and the second absorption mechanism is located on the pipeline between the dirty condensed water tank and the evaporator.

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