Device for concentrating sweet water by using waste heat of flue of molten salt furnace

Abstract

The utility model provides a device for concentrating sweet water by utilizing waste heat of a flue of a molten salt furnace, which comprises a cracking reaction kettle, the molten salt furnace, an evaporator, a condenser and an air heat exchanger, a heating jacket is arranged on the outer surface of the cracking reaction kettle, a molten salt outlet is arranged at the upper part of a furnace body of the molten salt furnace, a molten salt reflux inlet and a smoke outlet are arranged at the lower part of the furnace body, and the molten salt outlet is connected with a molten salt trough. A cracking fused salt pump and a backflow fused salt pump are arranged in the fused salt geosyncline, the cracking fused salt pump is connected with a fused salt inlet of the heating jacket, a fused salt outlet of the heating jacket is connected with the fused salt geosyncline, and the backflow fused salt pump is connected with a fused salt backflow opening of the furnace body. The upper portion of the separation chamber is respectively provided with a sweet water inlet and a steam outlet, the steam outlet is connected with a condenser, the upper portion of the heating chamber is provided with a smoke inlet and a smoke outlet, the smoke inlet is connected with a smoke outlet of the molten salt furnace, and the lower end of the collecting chamber is connected with a crude glycerin collecting groove.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the concentrated technical field for chemical industry especially relates to a device for concentrating sweet water by using flue waste heat of molten salt furnace. BACKGROUND

[0002] In the process of producing sebacic acid by using biological base, the first stage is to hydrolyze castor oil into ricinoleic acid and "sweet water" under certain temperature and pressure in the presence of catalyst. The "sweet water" is an aqueous solution of glycerol, and the glycerol content is about 8%. Glycerol has strong hygroscopicity and can reduce the freezing point of water. It is used to make antifreeze, antifreeze fluid, etc. It is also used as a moisturizer and hygroscopic agent in cosmetics, leather, tobacco, textiles, etc. It is an important organic chemical raw material, which can generate glycerol aldehyde and glyceric acid through oxidation reaction, and can generate propylene glycol through reduction reaction. It is also used to make nitroglycerin, alkyd resin and fat resin. The second stage is to react ricinoleic acid with NaOH solution in the presence of phenol flux, and then to prepare disodium salt of sebacic acid through high temperature cracking reaction. The reaction is carried out in a specific cracking kettle. The heat energy of the cracking kettle is provided by the continuous circulation of the molten salt in the molten salt furnace. The molten salt in the molten salt furnace is provided by burning natural gas in the combustion machine. A large amount of hot flue gas is generated after the natural gas is burned, and the temperature of the flue gas in the flue can reach 420 DEG C. Direct emission will waste a lot of heat energy. Therefore, in order to recover glycerol and avoid waste of heat energy, it is necessary to design a device for concentrating sweet water by using flue waste heat of molten salt furnace. SUMMARY

[0003] The utility model solves the problems of glycerol recovery and waste of heat energy in the process of producing sebacic acid by using biological base.

[0004] The utility model provides a device for concentrating sweet water by using flue waste heat of molten salt furnace, including cracking reaction kettle, molten salt furnace, evaporimeter, condenser, air heat exchanger,

[0005] The cracking reaction kettle is used for cracking reaction to prepare disodium salt of sebacic acid, and the outer surface is provided with heating jacket,

[0006] The molten salt furnace body inner wall is equipped with heating coil, and the upper part of the furnace body is provided with molten salt outlet, and the lower part of the furnace body is provided with molten salt backflow port and exhaust port, and the molten salt outlet is connected with molten salt groove, and the cracking molten salt pump and backflow molten salt pump are arranged in the molten salt groove, the cracking molten salt pump is connected with the molten salt inlet of heating jacket, the molten salt outlet of heating jacket is connected with molten salt groove, and the backflow molten salt pump is connected with the molten salt backflow port of furnace body,

[0007] The lower end of the molten salt furnace body is connected with the combustion machine, and the hot air channel of the combustion machine is connected with the hot air outlet of the air heat exchanger,

[0008] The evaporator comprises a separation chamber, a heating chamber and a collection chamber arranged in sequence from top to bottom, the upper part of the separation chamber is respectively provided with a sweet water inlet and a steam outlet, the steam outlet is connected with a condenser, the upper part and the lower part of the heating chamber are respectively provided with a flue gas inlet and a flue gas outlet, the flue gas inlet is connected with a flue gas outlet of a molten salt furnace, and the flue gas outlet is connected with a flue gas inlet of an air heat exchanger, and the lower end of the collection chamber is connected with a coarse glycerol collecting tank.

[0009] Further, the glycerol with a concentration of 8% is added at the sweet water inlet of the separation chamber of the evaporator, a valve is arranged on the connecting pipeline between the collection chamber of the evaporator and the coarse glycerol collecting tank, and when the glycerol concentration in the collection chamber is increased to 80-84% through heating, evaporation and concentration, the valve is opened to collect the coarse glycerol.

[0010] Further, the glycerol added at the sweet water inlet of the separation chamber is a byproduct in the production chain of sebacic acid.

[0011] Further, the middle part of the heating chamber of the evaporator is provided with a circulating pipe, and a plurality of heating pipes are arranged in the heating chamber in the circumferential direction, and the upper ends of the circulating pipe and the heating pipes are communicated with the separation chamber, and the lower ends are communicated with the collection chamber.

[0012] Further, the cleavage reaction kettle is proportionally placed with ricinoleic acid, a caustic soda solution and a phenol fluxing agent, and the reaction temperature in the cleavage reaction kettle is 250-300 DEG C.

[0013] The device for concentrating sweet water by utilizing flue gas waste heat of a molten salt furnace has the following beneficial effects: the device utilizes a large amount of waste heat in a flue during the operation process of a molten salt furnace in the second stage of producing sebacic acid as a heat source, sends the byproduct sweet water in the first stage of biologically producing sebacic acid into an evaporator, concentrates 8% of the sweet water into 80% of coarse glycerol, the device has large sweet water processing capacity, obvious effect, low investment and operation cost, energy saving and stable and reliable operation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The device for concentrating sweet water by utilizing flue gas waste heat of a molten salt furnace is a schematic view. DETAILED DESCRIPTION

[0015] In order to clearly illustrate the technical features of the scheme, the scheme will be described below through specific implementation manners, and combined with the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0016] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] like Figure 1 As shown, an apparatus for concentrating sweet water using waste heat from a molten salt furnace flue includes a pyrolysis reactor 1, a molten salt furnace 2, an evaporator 3, a condenser 4, and an air heat exchanger 5. Castor oil acid, caustic soda solution, and phenol flux are placed in the pyrolysis reactor 1 in proportion to carry out a cracking reaction to produce the disodium salt of sebacic acid. A heating jacket is provided on the outer surface of the pyrolysis reactor to heat the temperature of the pyrolysis reactor to 250-300℃.

[0018] The inner wall of the molten salt furnace 2 is surrounded by heating coils. A molten salt outlet 201 is located at the upper part of the furnace body, and a molten salt return port 202 and a flue gas outlet 203 are located at the lower part. The molten salt outlet 201 is connected to a molten salt trough 9. A pyrolysis molten salt pump 10 and a return molten salt pump 11 are installed in the molten salt trough 9. The pyrolysis molten salt pump 10 is connected to the molten salt inlet of the heating jacket, and the molten salt outlet of the heating jacket is connected to the molten salt trough 9. The return molten salt pump 11 is connected to the molten salt return port 202 of the furnace body. High-temperature flue gas is discharged from the molten salt furnace exhaust port 203. The gas temperature is 420℃. The lower end of the molten salt furnace 2 is connected to the burner 6. The upper part of the burner 6 is equipped with a natural gas inlet 601, and the lower part of the burner 6 is equipped with a hot air passage 602. The hot air passage 602 is connected to the hot air outlet 501 of the air heat exchanger 5. An automatic regulating valve is provided at the hot air outlet 501. Part of the hot air is input into the hot air passage of the burner 6. The temperature of this part of the gas is 60℃. The other part of the hot air is input into the flue and discharged. The cold air inlet of the air heat exchanger 5 is connected to the fan 8.

[0019] Evaporator 3 includes a separation chamber, a heating chamber, and a collection chamber arranged sequentially from top to bottom. The separation chamber has a volume of 15m³. 3The sweet water inlet 301 and the steam outlet 302 are arranged on the upper part of the separation chamber respectively, the steam outlet 302 is connected with the condenser 4, the condenser 4 is further provided with a cooling water recovery port 102 and a cooling gas outlet 401, the cooling gas outlet 401 is connected with the flue 12, the middle part of the heating chamber is provided with a circulating pipe, a plurality of heating pipes are arranged on the inner wall of the heating chamber in the circumferential direction, the heating pipes are stainless steel pipes in the embodiment, and the number of the heating pipes is 368, the upper ends of the circulating pipe and the heating pipes are communicated with the separation chamber, the lower ends of the circulating pipe and the heating pipes are communicated with the collection chamber, the upper part of the heating chamber is provided with a flue gas inlet 303 and a flue gas outlet 304, the flue gas inlet 303 is connected with the flue gas outlet 203 of the molten salt furnace, the flue gas outlet temperature of the flue gas outlet 304 is 86 DEG C, the flue gas outlet 304 is connected with the flue gas inlet of the air heat exchanger 5, the flue gas outlet 502 of the air heat exchanger 5 is connected with the flue 12, and the flue gas outlet temperature of the flue gas outlet 502 is 24 DEG C, and the lower end of the collection chamber is connected with the crude glycerol collection tank 7.

[0020] In the embodiment, the glycerol added at the sweet water inlet 301 of the separation chamber is a by-product in the production chain of sebacic acid, specifically, in the first stage of the biological production of sebacic acid, castor oil is hydrolyzed into ricinoleic acid and sweet water under the action of a catalyst at a certain temperature and pressure, the sweet water is an aqueous solution of glycerol with a concentration of 8%, which is added at the sweet water inlet 301 of the separation chamber of the evaporator 3, a valve is arranged on the connecting pipeline between the collection chamber of the evaporator 3 and the crude glycerol collection tank 7, when the glycerol concentration in the collection chamber is increased to 80-84% by heating, evaporation and concentration, the valve is opened, and the crude glycerol is collected.

[0021] The other parts not described in the utility model are all prior art, so they will not be described here.

[0022] It can be understood that the utility model is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model.In addition, these features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the utility model without departing from the spirit and scope of the utility model.Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the application belong to the scope protected by the utility model.

Claims

1. An apparatus for concentrating brine using flue waste heat from a molten salt furnace, characterized by, The device comprises a cracking reactor, a molten salt furnace, an evaporator, a condenser, and an air heat exchanger. The cracking reactor is used for cracking reaction to produce disodium salt of sebacic acid, and is provided with a heating jacket on the outer surface. The molten salt furnace is provided with a heating coil on the inner wall of the furnace body, a molten salt outlet on the upper part of the furnace body, a molten salt backflow port and a smoke outlet on the lower part of the furnace body, a molten salt tank connected with the molten salt outlet, a cracking molten salt pump and a backflow molten salt pump arranged in the molten salt tank, the cracking molten salt pump connected with the molten salt inlet of the heating jacket, the molten salt outlet of the heating jacket connected with the molten salt tank, and the backflow molten salt pump connected with the molten salt backflow port of the furnace body. The molten salt furnace is provided with a combustion machine connected with the hot air outlet of the air heat exchanger. The evaporator comprises a separation chamber, a heating chamber, and a collection chamber arranged in sequence from top to bottom, the upper part of the separation chamber is provided with a sweet water inlet and a steam outlet, the steam outlet is connected with the condenser, the upper part and the lower part of the heating chamber are provided with a flue gas inlet and a flue gas outlet, the flue gas inlet is connected with the smoke outlet of the molten salt furnace, the flue gas outlet is connected with the flue gas inlet of the air heat exchanger, and the lower end of the collection chamber is connected with a crude glycerol collection tank.

2. The apparatus for concentrating brine using flue waste heat of a molten salt furnace according to claim 1, wherein The glycerol with a concentration of 8% is added into the sweet water inlet of the separation chamber of the evaporator, and a valve is arranged on the connecting pipeline between the collection chamber of the evaporator and the crude glycerol collection tank.

3. The apparatus for concentrating brine using flue waste heat of a molten salt furnace according to claim 1, wherein The middle part of the heating chamber of the evaporator is provided with a circulating pipe, and a plurality of heating pipes are arranged in the heating chamber in the circumferential direction, the upper ends of the circulating pipe and the heating pipes are communicated with the separation chamber, and the lower ends thereof are communicated with the collection chamber.

4. The apparatus for concentrating brine using flue waste heat of a molten salt furnace according to claim 1, wherein The castor oil acid, the caustic soda solution, and the phenol flux are proportionally arranged in the cracking reactor, and the reaction temperature in the cracking reactor is 250-300℃.

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