CN216837522U

CN216837522U - System for retrieve oil-free aqueous ammonia in follow oily ammoniacal waste water

Info

Publication number: CN216837522U
Application number: CN202220581740.9U
Authority: CN
Inventors: 刘晨明; 王启伟; 赵宇婧; 李雅; 王天慧
Original assignee: Beijing Cycle Columbus Environmental Technology Research Institute Co ltd
Current assignee: Beijing Cycle Columbus Environmental Technology Research Institute Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-06-28
Anticipated expiration: 2032-03-17

Abstract

A system for recovering oil-free ammonia water from oil-containing ammonia-containing wastewater belongs to the technical field of wastewater treatment equipment and comprises a heat exchanger, a deamination tower, a tower top condenser, a secondary condenser and an absorption tower; the oil-containing and ammonia-containing wastewater outlet is connected with the cold fluid inlet of the heat exchanger, and the cold fluid outlet of the heat exchanger is connected with the feed inlet of the deamination tower; the top steam outlet of the deamination tower is connected with the hot fluid inlet of the top condenser, the top condenser is provided with a condensed liquid phase outlet and a condensed gas phase outlet, the condensed liquid phase outlet is connected with the reflux inlet of the deamination tower, and the condensed gas phase outlet is connected with the hot fluid inlet of the secondary condenser; the second-stage condenser is provided with a condensed liquid phase outlet and a gas phase outlet, and the gas phase outlet is connected with the feed inlet of the absorption tower. The utility model provides a retrieve the oily technological problem who influences its retrieval and utilization of aqueous ammonia.

Description

System for retrieve oil-free aqueous ammonia in follow oily ammoniacal waste water

Technical Field

The utility model belongs to the technical field of waste water treatment equipment, a system for retrieve oily ammonia water from oily ammonia wastewater is related to.

Background

A large amount of ammonia-containing wastewater is generated in the production processes of industries such as rare earth, nonferrous metallurgy, coal chemical industry and the like, the ammonia-containing wastewater usually contains a large amount of organic matters, the organic matters are generally called as oils, a large part of the oils have low boiling points and are easy to volatilize, and ammonia-containing steam generated in the stripping and rectifying process is transferred into the recovered ammonia water in the ammonia water recovery process, so that the purity of the ammonia water is influenced, and the ammonia water is difficult to recycle.

The traditional method generally comprises the steps of firstly removing oil and COD from wastewater, and then evaporating ammonia to recover ammonia water, but aiming at rare earth and metallurgy industries, because a high-salt and high-chlorine system is difficult to remove organic matters in the wastewater by using a biochemical method, the removal effect of advanced oxidation technologies such as Fenton and ozone catalytic oxidation on oil COD is limited, the wastewater still contains a certain amount of organic matters, and then the organic matters are still transferred into the ammonia water in the subsequent ammonia evaporation process, and the removal technology of the organic matters needs to add a large amount of medicaments, so that solid waste is generated, and the complexity and the cost of treatment are increased.

Patent CN207512032U discloses a processing apparatus for high COD high ammonia nitrogen oily wastewater, which comprises a grid adjusting tank, an oil separation sedimentation tank, an air flotation tank, an up-flow anaerobic sludge bed and a nitration apparatus which are sequentially communicated, and the resource recycling of ammonia can not be realized.

Patent CN214781185U discloses a novel processing apparatus for high COD high ammonia nitrogen oily waste water, including pretreatment tank, water oil separating tank, remove COD case, remove ammonia nitrogen case and synthesize case, pretreatment tank, water oil separating tank, remove COD case, remove ammonia nitrogen case and synthesize case and communicate in proper order, pretreatment tank's top is provided with the water inlet that supplies waste water to get into, pretreatment tank's inner wall movable mounting has two filter screens that set up side by side, the top of removing the COD case is provided with the interpolation structure that is used for adding COD degradation remover, ammonia nitrogen case's top is provided with another group and is used for adding the interpolation structure of ammonia nitrogen remover, synthesize incasement be provided with the integrated structure that is used for photocatalytic degradation to get rid of COD and ammonia nitrogen, also fail to realize the resourceful recycle of ammonia.

Patent CN209974512U discloses a coal tar waste water ammonia resource recovery plant, including the raw materials preheating tower, raw materials preheating tower low side fixedly connected with feed liquor pipe, raw materials preheating tower top and strip deamination tower pipe connection, strip deamination tower top is equipped with air duct one, air duct one and steam compressor's air inlet end fixed connection, steam compressor's the end fixedly connected with air duct two, two fixedly connected with air jets of air duct and heat exchange tube, heat exchange tube fixedly connected with capillary, capillary and condenser fixed connection, jet and strip deamination tower fixed connection, strip deamination tower low side pipe connection has the recovery fluid reservoir, it returns liquid pipe one to retrieve fluid reservoir fixedly connected with, it returns liquid pipe one fixedly connected with heater, heater fixedly connected with returns liquid pipe two, it returns liquid pipe two and strip deamination tower top fixed connection to return liquid pipe, recovery fluid reservoir fixedly connected with drain pipe. The method has the advantages of fully utilizing the redundant heat in the ammonia-containing steam and not solving the problem that the volatile oil enters the ammonia water.

The system for recovering the oil-free ammonia water from the oil-containing ammonia-containing wastewater is urgently needed, and volatile oil substances are prevented from entering the ammonia water to influence the quality and the utilization of the ammonia water.

Disclosure of Invention

The utility model aims at providing a retrieve system of no oily aqueous ammonia in follow oily ammonia-containing waste water, concrete technical scheme as follows.

A system for recovering oil-free ammonia water from oil-containing ammonia-containing wastewater is characterized by comprising a heat exchanger, a deamination tower, a tower top condenser, a secondary condenser and an absorption tower;

the oil-containing and ammonia-containing wastewater outlet is connected with the cold fluid inlet of the heat exchanger, and the cold fluid outlet of the heat exchanger is connected with the feed inlet of the deamination tower;

the top steam outlet of the deamination tower is connected with the hot fluid inlet of the top condenser, the top condenser is provided with a condensed liquid phase outlet and a condensed gas phase outlet, the condensed liquid phase outlet is connected with the reflux inlet of the deamination tower, and the condensed gas phase outlet is connected with the hot fluid inlet of the secondary condenser;

the second-stage condenser is provided with a condensed liquid phase outlet and a gas phase outlet, and the gas phase outlet is connected with the feed inlet of the absorption tower.

The working process of the utility model is as follows: the oily ammonia-containing wastewater enters a heat exchanger for heat exchange and then enters a deamination tower for deamination, steam containing volatile oil, ammonia and water is obtained at the tower top, and oil-water mixed liquid which is not easy to volatilize is obtained at the tower bottom; steam containing volatile oil, ammonia and water at the tower top enters a tower top condenser, the steam is cooled by the tower top condenser and then is separated into a liquid phase and a gas phase, and the liquid phase completely reflows to the top of the deamination tower; the gas phase condensed by the tower top condenser enters a secondary condenser, low-temperature condensate water (the water temperature is less than 15 ℃) is used for condensing the gas phase, and ammonia gas which is not condensed into liquid enters an absorption tower; and absorbing the ammonia gas entering the absorption tower by using pure water to obtain the oil-free ammonia water.

The utility model is suitable for treating the oily and ammonia-containing wastewater with oil content of 1-500 mg/L and ammonia content of 1-75g/L, after the oily and ammonia-containing wastewater is deaminated by the deamination tower, more than 99 percent of ammonia and part of volatile oil are transferred to the steam at the top of the tower; after condensation by the overhead condenser, more than 80% of the moisture in the steam is transferred to the liquid phase, while more than 50% of the oil and more than 80% of the ammonia remain in the gas phase; the condensed gas phase enters a secondary condenser, low-temperature condensed water is used for condensing the gas phase, more than 90% of oil, 5% -20% of ammonia gas and more than 99% of water in the gas phase are condensed into oil-containing ammonia water, and separation of oil substances and the ammonia gas is realized; the concentration of the finally obtained ammonia water is 10-35%, the oil content in the ammonia water is less than 0.01% (mass percent), and the ammonia recovery rate is more than 80%.

Further, a liquid outlet of a tower kettle of the deamination tower is connected with a hot fluid inlet of a heat exchanger, and the tower kettle liquid exchanges heat with the oily ammonia-containing wastewater through the tower kettle liquid, so that the heat of the tower kettle liquid is fully utilized.

Furthermore, the overhead condenser is a shell-and-tube condenser, steam enters a shell pass of the overhead condenser, and a heat exchange medium enters a tube pass of the overhead condenser.

Further, the overhead condenser is a horizontal condenser.

The utility model discloses following beneficial technological effect has: refluxing most of water in the top steam of the deamination tower through a tower top condenser to obtain ammonia gas containing volatile oil with extremely low water content; the secondary condenser rapidly cools almost all water and oil in the ammonia gas to be condensed into liquid phase for discharge, pure ammonia gas is absorbed by pure water to obtain oil-free ammonia water, and the technical problem that the recycling of the ammonia water is influenced by the oil content of the recovered ammonia water is solved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1-heat exchanger, 2-deamination tower, 3-overhead condenser, 4-secondary condenser and 5-absorption tower.

Detailed Description

The technical solution of the present invention is clearly and completely described below with reference to the drawings. It is to be understood that the described embodiments are merely exemplary of some, and not necessarily all, embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity or location.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

A system for recovering oil-free ammonia water from oil-containing ammonia-containing wastewater comprises a heat exchanger 1, a deamination tower 2, a tower top condenser 3, a secondary condenser 4 and an absorption tower 5 as shown in figure 1. An outlet of the oily ammonia-containing wastewater is connected with a cold fluid inlet of a heat exchanger 1, and a cold fluid outlet of the heat exchanger 1 is connected with a feed inlet of a deamination tower 2; a hot fluid inlet of the heat exchanger 1 is connected with a liquid outlet of a tower kettle of the deamination tower 2. The top steam outlet of the deamination tower 2 is connected with the hot fluid inlet of the top condenser 3, the top condenser 3 is a shell-and-tube condenser, steam enters the shell pass of the top condenser 3, and a heat exchange medium enters the tube pass of the top condenser 3. The tower top condenser 3 is provided with a condensed liquid phase outlet and a condensed gas phase outlet, the condensed liquid phase outlet is connected with a reflux inlet of the deamination tower 2, and the condensed gas phase outlet is connected with a hot fluid inlet of the secondary condenser 4. The second-stage condenser 4 is provided with a condensed liquid phase outlet and a gas phase outlet, and the gas phase outlet is connected with a feed inlet of the absorption tower 5.

The oily ammonia-containing wastewater with oil content of 1-500 mg/L and ammonia content of 1-75g/L enters a heat exchanger 1 for heat exchange and then enters a deamination tower 2 for deamination, steam containing volatile oil, ammonia and water is obtained at the tower top, a mixed liquid of the oil and the water which are not easy to volatilize is obtained at the tower bottom, and more than 99% of ammonia and part of the volatile oil are transferred to the steam at the tower top. The steam containing volatile oil, ammonia and water at the top of the tower enters a tower top condenser 3, the steam is separated into a liquid phase and a gas phase after being cooled by the tower top condenser 3, more than 80% of water in the steam is transferred to the liquid phase, and more than 50% of oil and more than 80% of ammonia still remain in the gas phase. And the liquid phase completely reflows to the top of the deamination tower 2, the gas phase condensed by the condenser 3 at the top of the tower enters a secondary condenser 4, low-temperature condensate water (the water temperature is less than 15 ℃) is used for condensing the gas phase, more than 90% of oil, 5% -20% of ammonia gas and more than 99% of water in the gas phase are condensed into ammonia water containing oil, and the separation of the oil substances and the ammonia gas is realized. The ammonia gas which is not condensed into liquid enters an absorption tower 5; pure water is used for absorbing ammonia gas entering the absorption tower 5, and oil-free ammonia water is obtained. The concentration of the finally obtained ammonia water is 10-35%, the oil content in the ammonia water is less than 0.01% (mass percent), and the ammonia recovery rate is more than 80%.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A system for recovering oil-free ammonia water from oil-containing ammonia-containing wastewater is characterized by comprising a heat exchanger, a deamination tower, a tower top condenser, a secondary condenser and an absorption tower;

2. The system of claim 1, wherein a deamination tower tank liquid outlet is connected to a heat exchanger hot fluid inlet.

3. The system of claim 1 or 2, wherein the overhead condenser is a shell and tube condenser.

4. The system of claim 3 wherein the overhead condenser is a horizontal condenser.