CN211496961U - Device for reducing steam consumption in ammonia distillation process of sodium carbonate by utilizing membrane distillation - Google Patents
Device for reducing steam consumption in ammonia distillation process of sodium carbonate by utilizing membrane distillation Download PDFInfo
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- CN211496961U CN211496961U CN201922135886.1U CN201922135886U CN211496961U CN 211496961 U CN211496961 U CN 211496961U CN 201922135886 U CN201922135886 U CN 201922135886U CN 211496961 U CN211496961 U CN 211496961U
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Abstract
The utility model discloses a device for reducing the steam consumption in the ammonia distillation process of soda by utilizing membrane distillation, which is characterized in that a filtering and purifying device is arranged behind a carbonization reaction system in the soda production, an ammonia distillation waste liquid-medium heat exchanger is arranged behind the ammonia distillation device, a medium-alkali making mother liquor heat exchanger is arranged behind the filtering and purifying device and the ammonia distillation waste liquid-medium heat exchanger, and a membrane distillation device and a cooling device are sequentially connected behind the medium-alkali making mother liquor heat exchanger; a condensation air gap chamber is arranged between the cold end of the membrane distillation device and the cooling device, the back of the membrane distillation device is divided into three paths, and the first path is connected with an ammonia still in the ammonia-soda process soda production system through a concentrated solution tank; the second path is communicated with a salt dissolving device in the ammonia-soda process soda production system through a dilute solution tank; the third path passes through the membrane distillation device and enters an air gap chamber, the air gap chamber is divided into two paths, the first path is communicated with a carbonization reaction system in the ammonia-soda process soda production system, and the second path is connected with a fresh water tank. The utility model discloses can effectively utilize the industrial waste heat of ammonia still process waste liquid, realize the concentration to the system alkali mother liquor.
Description
Technical Field
The utility model relates to a device for reducing the steam consumption in the ammonia distillation process of sodium carbonate by utilizing membrane distillation.
Background
The ammonia-soda process soda production is one of the industrial processes for large-scale production of soda in the world, ammonia is an intermediate medium, in the ammonia-soda process soda production, soda liquor discharged from the bottom of a carbonization tower after carbonization reaction is separated by a filter to obtain NaHCO3The crystallized solution is called soda making mother liquor, and the soda is made by ammonia soda process and NH3As intermediate medium for recycling use in the production process, NH3The recycling is effected by means of a distillation process.
The distillation process comprises the distillation of weak liquor and the distillation of mother liquor for producing alkali, wherein the weak liquor is mainly (NH) which is the main component generated in other processes in the production of soda by an ammonia-soda process4)2CO3And NH4HCO3And the like free ammonia. The recovery of free ammonia is separated from the filtered mother liquor, a weak liquor distillation device is arranged separately, and the ammonia component and carbon dioxide are separated from the mother liquor by using a distillation method, especially free NH is obtained after weak liquor distillation3And CO2After the liquid phase is removed by a heating method, the ammonia component is recovered step by step, the load of the ammonia distillation device is reduced, and the energy consumption is saved.
The mother liquor for preparing alkali contains NH4CL、(NH4)2CO3、NH4OH, etc. fixed ammonia and free ammonia with a small amount of CO2Or HCO3 -Components. And separating the ammonia component and the carbon dioxide from the mother liquor by adopting a distillation mode, and returning the ammonia component and the carbon dioxide to the production of the calcined soda again to realize ammonia circulation. Free ammonia (including ammonium carbonate and ammonium hydroxide) can be directly removed by heating and cooking, but fixed ammonia in the form of ammonium chloride or ammonium sulfate must be added into lime milk to be decomposed by a chemical method and then heated and distilled. The mother liquor distillation is the process with the largest steam heat consumption in the ammonia-soda alkali preparation process.
A large amount of steam is needed in the distillation link of the alkali-making mother liquor, moisture exists in the materials, a large amount of heat energy is used for the moisture evaporation process, the steam consumption is increased, meanwhile, the steam is evaporated along with the distillation components, the difficulty in collecting the material fractions is increased, and the quality of the material components is reduced. After the production materials are concentrated, the steam consumption in the subsequent distillation process can be greatly reduced, the quality of the distillate components can be improved, the yield in the distillation process can be improved, and the method has great significance for saving energy and reducing consumption in production.
Membrane distillation combines the features of conventional distillation techniques with the features of membranes. The method has the vapor mass transfer condensation process in the conventional distillation and the membrane separation process of separating substances diffusing and permeating the membrane. It avoids the defects of easy scaling and corrosion resistance of the distillation method and the need of high-pressure operation of the reverse osmosis method.
Membrane distillation is a new membrane separation technology, and is a novel membrane separation process combining the membrane separation technology with a traditional evaporation process. Based on vapor-liquid equilibrium, phase change is achieved by latent heat of vaporization. The method is realized by the temperature difference between two sides of the membrane, the vapor pressure difference of the transfer component caused by the temperature difference between two sides of the membrane is used as the driving force of mass transfer, and the hydrophobic microporous membrane which is not wetted by the solution to be treated is used as the transfer medium. During transport, the only function of the membrane is to act as a barrier between the two phases, not directly involved in the separation, the selectivity of the separation being determined entirely by the gas-liquid equilibrium. The membrane distillation process is a process in which heat and mass are transferred simultaneously. One side of the membrane is in direct contact with the hot solution to be treated (called the hot side) and the other side is in direct or indirect contact with the cold liquid (called the cold side). Due to the hydrophobicity of the membrane, the aqueous solution cannot pass through the membrane holes, but due to the vapor pressure difference of the volatile components on two sides of the membrane, the volatile vapor passes through the membrane holes and is transferred from the high vapor pressure side to the low vapor pressure side, and other components are blocked on the hot side by the hydrophobic membrane, so that the permeation flux of the membrane is generated, and the separation or purification of the mixture is realized. The method is very similar to the evaporation, mass transfer and condensation processes in the conventional distillation.
The membrane distillation technology has attracted extensive attention because of its advantages of lower energy consumption than the conventional thermal method, lower operation pressure than the general reverse osmosis needs, and the like. The concentration of the related high-salinity material can be realized at the temperature of 60-90 ℃, and the quality of the produced fresh water is higher. The (NH) in the alkali-making mother liquor is treated by membrane distillation after heating in the production of soda by ammonia-soda process4)2CO3、NH4HCO3、NH4Free ammonia components such as OH and the like are separated from the alkali making mother liquor in the form of ammonia gas and carbon dioxide gas, and pass through a membrane of membrane distillation to obtain gas components containing a large amount of ammonia gas and carbon dioxide on the evacuation side, so that the separation of the free ammonia in the alkali making mother liquor is realized. Meanwhile, a large amount of moisture in the heated alkali making mother liquor passes through a membrane of membrane distillation in the form of water vapor, condensate is obtained on a condensation side, and the concentration of the alkali making mother liquor is realized.
At present, a large amount of industrial waste heat is generated in the salt chemical production, particularly the ammonia-soda process soda production, the industrial waste heat is mostly generated in the discharge process of waste liquid and waste gas, the temperature is mostly concentrated at 70-100 ℃, the quality is low, and the industrial waste heat is difficult to apply to the traditional distillation technology, so the development value is low, and the heat waste is caused because a large amount of industrial waste heat is not utilized.
The membrane distillation technology has the characteristic of realizing material concentration by utilizing low-temperature heat, so that industrial waste heat generated in the production of soda by an ammonia-soda process has development and utilization values, thereby changing waste into valuable.
Meanwhile, the membrane distillation process can be carried out at a lower temperature, so that the existing low-grade industrial waste heat can be fully utilized, heat energy such as fresh steam and the like can be replaced, the aim of reducing the operation cost is fulfilled, and remarkable economic and social benefits are generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome in the soda production system mother liquor ammonia distillation in-process prior art exist not enough, provide an utilize membrane distillation to reduce the device that soda ammonia distillation process steam loss, isolate free ammonia etc. component and moisture from the soda process mother liquor, improve the concentration of the fixed ammonia component in the soda process mother liquor that gets into the ammonia distillation device in the ammonia-soda process alkali production technology, reduce the soda process mother liquor volume that gets into the ammonia still, aim at in the effect that reaches the steam consumption that reduces the mother liquor ammonia distillation process and reduce ammonia distillation waste liquid discharge.
In order to solve the technical problem, the utility model comprises a salt dissolving device, a carbonization reaction system and an ammonia distilling device in the ammonia-soda process soda production system, which is structurally characterized in that a filtering and purifying device is arranged behind the carbonization reaction system, an ammonia distilling waste liquid-medium heat exchanger is arranged behind the ammonia distilling device, a medium-alkali making mother liquor heat exchanger is arranged behind the filtering and purifying device and the ammonia distilling waste liquid-medium heat exchanger, and a membrane distillation device and a cooling device are sequentially connected behind the medium-alkali making mother liquor heat exchanger; a condensation air gap chamber is arranged between the cold end of the membrane distillation device and the cooling device, the back of the membrane distillation device is divided into three paths, and the first path is connected with an ammonia still in the ammonia-soda process soda production system through a concentrated solution tank; the second path is communicated with a salt dissolving device in the ammonia-soda process soda production system through a dilute solution tank; the third path passes through the membrane distillation device and enters an air gap chamber, the air gap chamber is divided into two paths, the first path is communicated with a carbonization reaction system in the ammonia-soda process soda production system, and the second path is connected with a fresh water tank.
A circulating pump is arranged between the ammonia distillation waste liquid-medium heat exchanger and the medium-alkali making mother liquor heat exchanger.
The membrane distillation device is closed vacuum air gap type membrane distillation, and the membrane module type is preferably hollow fiber type or flat plate type.
The air gap chamber is communicated with an air gap part of a membrane component in the membrane distillation device and communicated with gas phase parts of the fresh liquid tank and the concentrated liquid tank, and the air gap chamber is also connected with a vacuum pump.
The filtering and purifying device is preferably a high-temperature-resistant ceramic membrane filter and a self-cleaning filter.
The ammonia distillation waste liquid-medium heat exchanger is designed to be a wide flow channel, the type of the heat exchanger is preferably a plate surface type or a shell-and-tube type, and the heat exchange mode is preferably a spray type or an immersion type.
The medium-alkali making mother liquor heat exchanger is preferably a traditional plate-surface type and shell-and-tube type heat exchanger.
The ammonia distillation waste liquid-medium heat exchanger takes high-temperature ammonia distillation waste liquid discharged by an ammonia distillation device in an ammonia-soda alkali preparation unit as a heat source to heat a medium, the heated medium is conveyed to a medium-alkali preparation mother liquid heat exchanger, and the ammonia distillation waste liquid with the temperature reduced after heat exchange is discharged out of the system. And a medium-alkali making mother liquor heat exchanger is arranged behind the ammonia distillation waste liquid-medium heat exchanger, and the medium after temperature rise is used as a heat source to heat the filtered alkali making mother liquor.
A filtering and purifying device is arranged after the carbonization procedure of soda production, and is used for filtering the material soda making mother liquor to remove impurities such as solid particles, suspended matters and the like.
The membrane distillation device is characterized in that the hot end of the membrane distillation device is heated alkali making mother liquor, the cold end of the membrane distillation device is provided with an air gap chamber, the air gap chamber is communicated with an air gap part of a membrane component in the membrane distillation device, a gas phase part at the top of a weak liquor tank and a gas phase part at the top of a thick liquor tank, the air gap chamber is divided into two paths, the first path is communicated with a carbonization reaction system in an ammonia-soda process soda production system and is used for conveying gas components through a vacuum pump, the second path is communicated with a salt melting device in the ammonia-soda process soda production system through the weak liquor tank and is used for.
The air gap chamber is connected with a cooling device, the salt solution in the ammonia-soda process soda production system is used as a cooling source, the salt solution is conveyed to a salt dissolving device after the temperature of the salt solution is raised, the membrane distillation device is divided into two paths, the first path is connected with an ammonia still in the ammonia-soda process soda production system, and the concentrated alkali-making mother liquor is conveyed; and the second path passes through the membrane distillation device and enters the air gap chamber, the air gap chamber is divided into two paths, the first path is connected with a carbonization reaction system in the ammonia-soda process soda production system and used for conveying separated gas components, and the second path is connected with a salt melting device in the ammonia-soda process soda production system and used for conveying condensed liquid.
The heat exchange device comprises a medium pipeline, an ammonia distillation waste liquid-medium heat exchanger and a medium-alkali making mother liquor heat exchanger. The medium adopts closed circulation between the ammonia evaporation waste liquid-medium heat exchanger and the medium-alkali making mother liquid heat exchanger, the medium increases the temperature through heat exchange in the ammonia evaporation waste liquid-medium heat exchanger, and the medium reduces the temperature through heat exchange in the medium-alkali making mother liquid heat exchanger.
The ammonia distillation waste liquid-medium heat exchanger heats the medium by taking the ammonia distillation waste liquid as a heat source, and the medium with the raised temperature is introduced into the medium-alkali making mother liquor heat exchanger. The medium-alkali making mother liquor heat exchanger takes a medium as a heat source to heat the alkali making mother liquor, and the alkali making mother liquor with the raised temperature is introduced into the membrane distillation unit;
the medium is adopted to transfer heat in two materials, ammonia evaporation waste liquid and alkali making mother liquor are not used for direct heat exchange, scaling, fouling and blocking of membrane components in a membrane distillation device and the like caused by the fact that the ammonia evaporation waste liquid enters the alkali making mother liquor material due to leakage of a heat exchanger are avoided, and potential risk factors such as component deterioration in alkali making mother liquor production and the like are avoided.
In the heat exchange unit of ammonia distillation waste liquid-alkali making mother liquid, the medium is selected from nontoxic and nonvolatile liquid media such as water, oil, alkane and the like; the heat exchange of the ammonia distillation waste liquid and the alkali making mother liquid is completed by medium heat transfer, so that the corrosion of the ammonia distillation waste liquid to a membrane component in a membrane distillation system, which is caused by the leakage of heat transfer equipment, and the potential risk factors such as the deterioration of the alkali making mother liquid component, which is caused by the leakage of the ammonia distillation waste liquid, are avoided.
The membrane distillation device is preferably in a vacuum air gap type membrane distillation mode, the membrane component can be in a hollow fiber type or a flat plate type, the membrane distillation device is closed, and a vacuum pump is used for pumping gaseous components generated in the operation process of the membrane distillation device so as to maintain the vacuum degree of the membrane distillation device.
Under the action of membrane distillation, components such as moisture, ammonia gas and carbon dioxide in the heated alkali making mother liquor pass through a membrane in a gas form, the moisture and part of other components are cooled into liquid under the condensation action of a cooler, a vacuum pump extracts gaseous components to a carbonization reaction system in an ammonia-soda process soda production system to achieve the purpose of recycling, the vacuum degree of the membrane distillation system is maintained, and a thin liquid generated by membrane distillation enters a salt dissolving process in the ammonia-soda process soda production system to play a role of pre-configuring ammonia salt water.
And (3) after membrane distillation, the water content of the alkali-making mother liquor is reduced, the free ammonia component is reduced, the concentrated mother liquor with higher fixed ammonia component content enters an ammonia still of an ammonia-soda alkali-making unit for ammonia distillation treatment, and the recycling of NH3 is realized.
The utility model has the advantages that:
1. the utility model discloses set up ammonia still process waste liquid-system alkali mother liquor heat exchange unit, through extracting the heat from the ammonia still process waste liquid that ammonia-soda process self produced with the combination of membrane distillation mode for the concentration of system alkali mother liquor has realized the effective utilization of low-quality industry used heat.
2. The utility model discloses owing to set up the membrane distillation device, and be used for the membrane distillation process of system alkali mother liquor with the industry waste heat, separate out free ammonia attitude component and moisture from system alkali mother liquor, and be used for soda production process, the concentration of ammonium chloride in the system alkali mother liquor that gets into the ammonia distillation tower has been improved, the system alkali mother liquor volume that gets into the ammonia distillation tower in the soda production has been reduced, the concentration ratio to ammonium chloride reaches 1.5 ~ 2 times on current basis, the system alkali mother liquor that gets into the ammonia distillation tower decrement more than the decrement third on current basis, consequently, the steam consumption that ammonia-soda process system alkali unit system alkali mother liquor ammonia process produced because of evaporating unnecessary moisture has been reduced. Meanwhile, the discharge amount of the ammonia distillation waste liquid is reduced, and the method has positive significance in energy conservation and emission reduction.
3. Adopt the utility model discloses, separate out free ammonia and carbon dioxide gas component from the soda mother liquor through the membrane distillation mode to direct application has optimized the light liquid distillation link in the current flow to soda carbonization reaction process, produces the effect of practicing thrift the energy consumption and reducing the working costs.
4. Adopt the utility model discloses, can break away from out from the alkali mother liquor of system with carbonate, the desorption rate exceeds 80%, the reduction of carbonate content, greatly reduced the scale deposit tendency of follow-up ammonia still in-process material, alleviateed the scale deposit phenomenon in the ammonia still, the life cycle of ammonia still has been prolonged, the concentration and the quality of CaCL2 in the ammonia still waste liquid of ammonia still exhaust have been improved simultaneously, the concentration of CaCL2 reaches 25% ~ 30% in the ammonia still waste liquid after membrane distillation process optimization, be favorable to subsequent calcium chloride production.
Drawings
Fig. 1 is a schematic view of the apparatus of the present invention.
Detailed Description
Example 1
In order to better illustrate the objects, technical solutions and advantages of the present invention, the following description is further provided with reference to the accompanying drawings.
Referring to fig. 1, the device for reducing the steam consumption in the ammonia distillation process of the calcined soda by using membrane distillation comprises a salt dissolving device, a carbonization reaction system and an ammonia distillation device in a calcined soda production unit. The system also comprises a carbonization reaction system, a filtering and purifying device, an ammonia still waste liquid-medium heat exchanger, a medium-alkali making mother liquid heat exchanger, a membrane distillation device, a condensation air gap chamber and a cooling device, wherein the carbonization reaction system is connected to the filtering and purifying device, the ammonia still is connected to the ammonia still waste liquid-medium heat exchanger, the filtering and purifying device and the ammonia still waste liquid-medium heat exchanger are connected to the medium-alkali making mother liquid heat exchanger together, and the. The back of the membrane distillation device is divided into three paths, the first path is connected to an ammonia distillation device in an ammonia-soda process soda production system through a concentrated solution tank, and concentrated soda production mother solution is conveyed; the second path is connected to a thin liquid tank and used for conveying thin liquid; and the third path passes through the membrane distillation device and enters an air gap chamber, and the air gap chamber is communicated with an air gap part of a membrane assembly in the membrane distillation device. The air gap chamber is divided into two paths, the first path is communicated with a carbonization reaction system in the ammonia-soda process soda production system and conveys gas components through a vacuum pump, and the second path is communicated with a salt melting device in the ammonia-soda process soda production system through a weak liquid tank and conveys condensate through a pump.
An ammonia distillation waste liquid-medium heat exchanger is arranged behind an ammonia distillation device in the soda production unit, wherein the heat exchanger is a wide-runner plate type heat exchanger and is respectively provided with a medium and a channel and a conveying pipeline for the ammonia distillation waste liquid, and the medium is heated by taking the ammonia distillation waste liquid as a heat source.
A filtration and purification device is arranged behind a carbonization reaction system in the soda production unit, the filtration and purification device is a high-temperature resistant ceramic membrane filter for filtering the soda-making mother liquor to remove solid particles and suspended impurities, and the filtration precision is not less than 20 mu m.
The medium-alkali making mother liquor heat exchanger is arranged behind the filtering and purifying device and the ammonia evaporation waste liquid-medium heat exchanger, the medium-alkali making mother liquor heat exchanger adopts the design of a traditional plate heat exchanger, and is respectively provided with a medium channel and an alkali making mother liquor channel and an output channel, and the medium is used as a heat source to heat the filtered and purified alkali making mother liquor.
The medium between the ammonia distillation waste liquid-medium heat exchanger and the medium-alkali making mother liquid heat exchanger transfers heat between the ammonia distillation waste liquid-medium heat exchanger and the medium-alkali making mother liquid heat exchanger through closed circulation by the pushing of the circulating pump.
The membrane distillation device is flat plate type vacuum air gap membrane distillation, the cold end of the membrane distillation device is connected with a cooling device, a layer of condensed air gap chamber is arranged between the cold end and the cooling device, the cooling device is a plate type heat exchanger, the bottom of the air gap chamber is connected to a fresh liquid tank, and the condensed fresh liquid generated in the membrane distillation process and the cooling device is conveyed. The top of the air gap chamber is connected to a carbonization reaction system in a soda production system, and gas components generated in the membrane distillation process are conveyed through a vacuum pump.
The membrane distillation device is divided into two paths, the first path conveys the alkali making mother liquor concentrated by the membrane distillation device to an ammonia distillation device in the ammonia-soda process soda production system, the second path passes through the membrane distillation device and enters an air gap chamber, the air gap chamber is divided into two paths, the first path conveys the separated gas components to a carbonization reaction system in the ammonia-soda process soda production system, and the second path conveys the condensed light liquor to a salt melting device in the ammonia-soda process soda production system.
The membrane distillation device is a flat plate type vacuum air gap membrane distillation device, the membrane distillation device is a closed type package, and a vacuum pump is used for pumping gaseous components generated in the operation process of the membrane distillation device so as to maintain the vacuum degree of the membrane distillation device. Under the action of membrane distillation, components such as moisture, ammonia gas and carbon dioxide in the heated alkali making mother liquor pass through a membrane in a gas form, the moisture and part of other components are cooled into liquid under the condensation action of a cooler, a vacuum pump extracts gaseous components to a carbonization reaction system in an ammonia-soda process soda production system to achieve the purpose of recycling, the vacuum degree of the membrane distillation system is maintained, and fresh liquid generated by membrane distillation enters a salt melting device in the ammonia-soda process soda production system to be pre-configured with ammonia salt water for recycling ammonia components in condensed fresh liquid.
And (3) after membrane distillation, the water content of the alkali-making mother liquor is reduced, the free ammonia component is reduced, the concentrated mother liquor with higher fixed ammonia component content enters an ammonia still of an ammonia-soda alkali-making unit for ammonia distillation treatment, and the recycling of NH3 is realized.
Example 2
The embodiment 2 is basically the same as the embodiment 1, and mainly differs in that the ammonia still waste liquid-medium heat exchanger is an immersed plate heat exchanger, the ammonia still waste liquid-medium heat exchanger is immersed in the ammonia still waste liquid, and only a heat exchange medium channel and a conveying pipeline are arranged.
The filtering and purifying device adopts a self-cleaning filter, the filtering precision is not less than 20 mu m, and the effect of filtering treatment of the alkali-making mother liquor is met.
The membrane distillation device is hollow fiber type vacuum air gap membrane distillation, and the cooling device arranged behind the air gap chamber is a tubular heat exchanger.
Claims (7)
1. A device for reducing the steam consumption in the ammonia distillation process of soda ash by utilizing membrane distillation comprises a salt melting device, a carbonization reaction system and an ammonia distillation device in an ammonia-soda process soda production system, and is characterized in that a filtering and purifying device is arranged behind the carbonization reaction system, an ammonia distillation waste liquid-medium heat exchanger is arranged behind the ammonia distillation device, a medium-soda mother liquor heat exchanger is arranged behind the filtering and purifying device and the ammonia distillation waste liquid-medium heat exchanger, and a membrane distillation device and a cooling device are sequentially connected behind the medium-soda mother liquor heat exchanger; a condensation air gap chamber is arranged between the cold end of the membrane distillation device and the cooling device, the back of the membrane distillation device is divided into three paths, and the first path is connected with an ammonia still in the ammonia-soda process soda production system through a concentrated solution tank; the second path is communicated with a salt dissolving device in the ammonia-soda process soda production system through a dilute solution tank; the third path passes through the membrane distillation device and enters an air gap chamber, the air gap chamber is divided into two paths, the first path is communicated with a carbonization reaction system in the ammonia-soda process soda production system, and the second path is connected with a fresh water tank.
2. The apparatus for reducing the steam consumption in the ammonia distillation process of the calcined soda by utilizing the membrane distillation as claimed in claim 1, wherein a circulating pump is further arranged between the ammonia distillation waste liquid-medium heat exchanger and the medium-soda making mother liquor heat exchanger.
3. The apparatus for reducing the steam consumption in the ammonia distillation process of the calcined soda by using the membrane distillation as claimed in claim 1, wherein the membrane distillation apparatus is closed vacuum air gap type membrane distillation, and the membrane module is in a hollow fiber type or a flat plate type.
4. The apparatus for reducing the steam consumption in the ammonia distillation process of soda ash by membrane distillation as claimed in claim 1, wherein the air gap chamber is communicated with the air gap part of the membrane module in the membrane distillation apparatus and communicated with the gas phase parts of the thin liquor tank and the thick liquor tank, and the air gap chamber is further connected with a vacuum pump.
5. The device for reducing the steam consumption in the ammonia distillation process of the calcined soda by using the membrane distillation as claimed in claim 1, wherein the filtering and purifying device is a high-temperature-resistant ceramic membrane filter or a self-cleaning filter.
6. The device for reducing the steam consumption in the ammonia distillation process of the calcined soda by using the membrane distillation as claimed in claim 1, wherein the ammonia distillation waste liquid-medium heat exchanger is designed with a wide flow channel, the type of the heat exchanger is a plate surface type or a shell-and-tube type, and the heat exchange mode is a spray type or an immersion type.
7. The apparatus for reducing the steam consumption in the ammonia distillation process of soda ash by using membrane distillation as claimed in claim 1, wherein the medium-soda mother liquor heat exchanger is a plate surface type or shell-and-tube type heat exchanger.
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