Double-effect vacuum concentration equipment

Abstract

The invention relates to the technical field of vacuum concentration, in particular to double-effect vacuum concentration equipment, mainly aims to solve the problems that in the prior art, the evaporation rate is low, energy loss is large, nutritional ingredients in materials are prone to being damaged, and the flavor and taste of the materials are difficult to guarantee, and adopts the following technical scheme that the double-effect vacuum concentration equipment comprises a feeding pipe, a first-effect heater is arranged outside the first-effect circulating pipe, a first-effect evaporation chamber is arranged on the side, away from the first-effect heater, of the first-effect circulating pipe, a first-effect upper pipe box outlet is formed outside the first-effect heater, and the first-effect upper pipe box outlet is communicated with the first-effect evaporation chamber; the external heating forced circulation evaporation mode is adopted, the evaporation speed is high, the concentration ratio is large and can reach 1.3 (common traditional Chinese medicine extract), two-effect simultaneous evaporation is adopted in the concentrator, secondary steam is fully used, boiler investment is saved, energy consumption is reduced, and compared with other evaporators, the energy consumption is reduced by 40%.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum concentration, in particular to double-effect vacuum concentration equipment. Background Art

[0002] Double-effect vacuum concentrator is a concentrating equipment that uses secondary steam for two times according to the principle of evaporation. It adopts the method of two-effect simultaneous evaporation, and uses the secondary steam generated by the first-effect evaporation concentration as a heat source again, and introduces it into another effect concentrator. The pressure and boiling point of the solution in the double-effect concentrator are controlled by the PLC intelligent automatic control system to appropriately reduce it, so as to use the secondary steam generated by the first-effect evaporator for heating. Atmospheric pressure concentrating equipment refers to concentrating equipment with an operating pressure within the atmospheric pressure range. It is mainly used for the concentration of volatile liquids or liquid mixtures, such as acetic acid, ammonia water, ethanol, etc. Atmospheric pressure concentrating equipment is widely used in sewage treatment, chemical industry, pharmaceutical, food and other industries.

[0003] The evaporation surface of the existing atmospheric pressure concentration equipment is at atmospheric pressure, the working principle is relatively intuitive and the equipment structure is simple, and the water in the solution is directly evaporated by heating to achieve the concentration effect.

[0004] However, although the atmospheric pressure concentration equipment has a simple structure, it directly heats the solution to evaporate the water to achieve the concentration effect. Its evaporation rate is low and the energy loss is large. At the same time, due to the high heating temperature, the nutrients in the material are easily destroyed, and the flavor and taste of the material are difficult to guarantee. Therefore, a double-effect vacuum concentration equipment is proposed. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a dual-effect vacuum concentration device, which can effectively solve the problems of low evaporation rate, large energy loss, easy destruction of nutrients in the material, and difficulty in ensuring the flavor and taste of the material in the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a double-effect vacuum concentration device, comprising a feed pipe, the feed pipe is externally connected to a first-effect circulation pipe, a first-effect heater is externally arranged on the first-effect circulation pipe, a first-effect evaporation chamber is arranged on a side of the first-effect circulation pipe away from the first-effect heater, a first-effect upper pipe box outlet is externally arranged on the first-effect heater, the first-effect upper pipe box outlet is connected to the first-effect evaporation chamber, a first-effect to second-effect pipe and a first-effect to condensation pipe are externally arranged on the first-effect evaporation chamber, a side of the first-effect to second-effect pipe away from the first-effect evaporation chamber is connected to the second-effect heater, and a side of the first-effect to condensation pipe away from the first-effect evaporation chamber is connected to a heat exchanger;

[0008] A second-effect circulation pipe is arranged below the second-effect heater, a side of the second-effect circulation pipe away from the second-effect heater is connected to a second-effect evaporation chamber, a second-effect upper pipe box outlet is arranged outside the second-effect heater, the second-effect upper pipe box outlet is connected to the second-effect evaporation chamber, a second-effect inlet condenser is arranged outside the second-effect evaporation chamber, a side of the second-effect inlet condenser away from the second-effect evaporation chamber is connected to a heat exchanger, the outside of the second-effect inlet condenser is connected to the second-effect heater through a pipeline, and the second-effect heater is connected to a collection tank through a pipeline;

[0009] A liquid receiving tank is arranged below the heat exchanger, and the outside of the liquid receiving tank is connected with a water ring vacuum pump.

[0010] Among them, the double-effect external circulation concentrator can concentrate materials with relatively high viscosity, and the concentration ratio can reach 1:1.3. The plate heat exchanger is used to improve the heat exchange effect and accelerate the cooling speed of the material in a limited space. Through the vacuum system, the vacuum degree of the first effect can reach -0.07MPa, and the vacuum degree of the second effect can reach -0.085MPa. The parts of this concentrator that contact the material are made of SUS304 or SUS316 stainless steel, which meets the hygiene requirements of medicine and food. The inner surface of each heater and evaporation chamber has rounded transitions, and the welds are polished. The position and orientation of the opening of the material inlet of the evaporation chamber are strictly calculated to ensure that the evaporation circulation material is centrifugally cut into the evaporation chamber, and then spirally descends along the inner surface of the evaporation chamber instead of gravity sedimentation, thereby ensuring the improvement of evaporation capacity.

[0011] Furthermore, control valves are provided outside the pipeline, and two groups of control valves are provided. One group of control valves is used to control the channel between the second-effect inlet condenser and the collecting tank, and the other group of control valves is used to control the channel between the second-effect heater and the collecting tank and the second-effect inlet condenser.

[0012] Furthermore, a side of the water ring vacuum pump away from the liquid receiving tank is connected to a circulating water tank, and a control valve is provided between the water ring vacuum pump and the circulating water tank.

[0013] Furthermore, a first-effect discharge pipe is arranged outside the first-effect evaporation chamber, and the first-effect discharge pipe is connected with the first-effect inlet pipe and the first-effect inlet condenser pipe. A vapor-liquid separator is arranged outside the first-effect discharge pipe, and the vapor-liquid separator separates the evaporated material, and the liquid after separation is put into the first-effect evaporation chamber through circulation downward.

[0014] Furthermore, a second-effect discharge pipe is arranged outside the second-effect evaporation chamber, and the second-effect discharge pipe is connected with the second-effect condensation inlet pipe. A vapor-liquid separator is arranged outside the second-effect discharge pipe, and the vapor-liquid separator separates the evaporated material, and the liquid after separation is put into the second-effect evaporation chamber through circulation downward.

[0015] Furthermore, a sewage pipe is provided between the first-effect circulation pipe and the second-effect circulation pipe, and a control valve is provided outside the sewage pipe.

[0016] Furthermore, a control valve is arranged outside the first-effect to second-effect pipe.

[0017] Furthermore, a control valve is arranged outside the first-effect inlet condenser.

[0018] Furthermore, a control valve is provided outside the second-effect condenser inlet pipe.

[0019] Furthermore, a control valve is provided between the heat exchanger and the liquid receiving tank, and a vacuum valve is provided between the water ring vacuum pump and the liquid receiving tank.

[0020] The heater tubes, condenser tubes and intermediate connecting pipes are all polished inside and outside to ensure smooth flow of materials without obstruction, no coking or clogging of the heater, reducing scaling and cleaning times, and improving production efficiency.

[0021] Beneficial Effects

[0022] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0023] 1. This concentrator adopts external heating forced circulation evaporation mode, which has fast evaporation speed and high concentration ratio, which can reach 1.3 (general Chinese medicine extract). This concentrator adopts two-effect simultaneous evaporation, and the secondary steam is fully used, which not only saves boiler investment, but also saves energy consumption. The energy consumption is reduced by 40% compared with other evaporators;

[0024] 2. The materials in this concentrator are concentrated in a sealed state, which is not easy to escape and reduce pollution. The materials can be concentrated on the same day, it is not easy to coke, and it is easy to clean. It uses a CIP cleaning system to save labor. Since the operating pressure is lower than normal pressure, the boiling point of the solution decreases, which can reduce or prevent the decomposition of heat-sensitive materials. It can concentrate solutions that are not resistant to high temperatures and is suitable for treating heat-sensitive solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the overall front view structure of the present invention;

[0027] Figure 2It is a schematic diagram of the overall top view of the structure of the present invention.

[0028] Figure numerals: 1. first-effect heater; 2. first-effect evaporation chamber; 3. vapor-liquid separator; 4. second-effect heater; 5. second-effect evaporation chamber; 6. heat exchanger; 7. liquid receiving tank; 8. collecting tank; 9. water ring vacuum pump; 10. circulating water tank; 11. drain pipe; 12. feed pipe; 13. first-effect circulation pipe; 14. second-effect circulation pipe; 15. first-effect to second-effect pipe; 16. first-effect to condenser pipe; 17. second-effect to condenser pipe. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention will be further described below in conjunction with the embodiments.

[0031] The double-effect vacuum concentration equipment comprises a feed pipe 12, the feed pipe 12 is externally connected to a first-effect circulation pipe 13, a first-effect heater 1 is arranged outside the first-effect circulation pipe 13, a first-effect evaporation chamber 2 is arranged on a side of the first-effect circulation pipe 13 away from the first-effect heater 1, a first-effect upper pipe box outlet is arranged outside the first-effect heater 1, the first-effect upper pipe box outlet is connected to the first-effect evaporation chamber 2, a first-effect inlet pipe 15 and a first-effect inlet condensation pipe 16 are arranged outside the first-effect evaporation chamber 2, a side of the first-effect inlet pipe 15 away from the first-effect evaporation chamber 2 is connected to a second-effect heater 4, and a side of the first-effect inlet condensation pipe 16 away from the first-effect evaporation chamber 2 is connected to a heat exchanger 6;

[0032] A second-effect circulation pipe 14 is arranged below the second-effect heater 4, and a side of the second-effect circulation pipe 14 away from the second-effect heater 4 is connected to the second-effect evaporation chamber 5, a second-effect upper pipe box outlet is arranged outside the second-effect heater 4, and the second-effect upper pipe box outlet is connected to the second-effect evaporation chamber 5, and a second-effect inlet condensation pipe 17 is arranged outside the second-effect evaporation chamber 5, and a side of the second-effect inlet condensation pipe 17 away from the second-effect evaporation chamber 5 is connected to the heat exchanger 6, and the outside of the second-effect inlet condensation pipe 17 is connected to the second-effect heater 4 through a pipeline, and the second-effect heater 4 is connected to the collecting tank 8 through a pipeline;

[0033] A liquid receiving tank 7 is arranged below the heat exchanger 6 , and the outside of the liquid receiving tank 7 is connected to a water ring vacuum pump 9 .

[0034] Control valves are arranged outside the pipeline, and there are two groups of control valves. One group of control valves is used to control the passage between the second-effect inlet condenser pipe 17 and the collecting tank 8 , and the other group of control valves is used to control the passage between the second-effect heater 4 and the collecting tank 8 and the second-effect inlet condenser pipe 17 .

[0035] A side of the water ring vacuum pump 9 away from the liquid receiving tank 7 is connected to a circulating water tank 10 , and a control valve is provided between the water ring vacuum pump 9 and the circulating water tank 10 .

[0036] A first-effect discharge pipe is arranged outside the first-effect evaporation chamber 2, and the first-effect discharge pipe is connected with the first-effect inlet pipe 15 and the first-effect inlet condenser pipe 16. A vapor-liquid separator 3 is arranged outside the first-effect discharge pipe, and the vapor-liquid separator 3 separates the evaporated material, and the liquid after separation is put into the first-effect evaporation chamber 2 through circulation downward.

[0037] A second-effect discharge pipe is arranged outside the second-effect evaporation chamber 5, and the second-effect discharge pipe is connected with the second-effect condensation inlet pipe 17. A vapor-liquid separator 3 is arranged outside the second-effect discharge pipe. The vapor-liquid separator 3 separates the evaporated material, and the liquid after separation is put into the second-effect evaporation chamber 5 through circulation downward.

[0038] A sewage pipe 11 is provided between the first-effect circulation pipe 13 and the second-effect circulation pipe 14 , and a control valve is provided outside the sewage pipe 11 .

[0039] A control valve is provided outside the first-effect to second-effect pipe 15 .

[0040] A control valve is arranged outside the first-effect condenser inlet pipe 16 .

[0041] A control valve is arranged outside the second-effect condenser inlet pipe 17 .

[0042] A control valve is provided between the heat exchanger 6 and the liquid receiving tank 7 , and a vacuum valve is provided between the water ring vacuum pump 9 and the liquid receiving tank 7 .

[0043] Working principle:

[0044] Preparation stage: Check whether the heaters and evaporators of each effect are cleaned to ensure that there is no residue that affects the concentration effect; check whether the control valves are in the correct opening and closing positions to prevent leakage or abnormal pressure during operation; confirm that the auxiliary equipment such as the water ring vacuum pump 9, circulating water tank 10, and sewage pipe 11 are in good condition; check whether the power supply, water source, and steam source are stable and reliable;

[0045] Driving stage:

[0046] Open the vacuum valve and start the water ring vacuum pump 9 to put the system in a vacuum state. This is a key step to maintain the original taste of the material, because in a vacuum state, the evaporation temperature of the material decreases, and the flavor substances and nutrients in the material are less affected by the high temperature. Open the feed valve set outside the feed pipe 12, slowly add the liquid material to be concentrated into the first-effect heater 1, and close the feed valve when the liquid material is seen in the sight glass.

[0047] Normal operation stage:

[0048] The primary steam supplied by the boiler enters the first-effect heater 1, and the tube-side material is heated and boiled, and is ejected from the outlet of the first-effect upper tube box into the first-effect evaporation chamber 2. The secondary steam generated by it rises, is extracted after passing through the vapor-liquid separator 3, and the liquid is circulated downward to the first-effect evaporation chamber 2. The water content in the material is continuously evaporated to obtain a concentrated liquid. The secondary steam coming out of the first-effect evaporation chamber 2 enters the second-effect heater 4 through the first-effect to second-effect pipe 15, and replaces the primary steam of the boiler as the heating heat source of the second-effect heater 4. The material of the second effect is heated, boiled and evaporated, and is ejected from the outlet of the second-effect upper tube box into the second-effect evaporation chamber 5. The steam generated by it rises, is extracted after passing through the vapor-liquid separator 3, and the liquid is circulated downward to the second-effect evaporation chamber 5. The water content in the material is continuously evaporated to obtain a concentrated liquid. By controlling the different vacuum degrees of each effect, the boiling points of each effect are different, forming a temperature difference power for heat exchange, so that the water content in the material of each effect is continuously evaporated, and the concentrated liquid can be released after reaching the required concentration ratio;

[0049] Adjust the opening degree of each effect feed valve, control the liquid level to maintain a certain height, so that the evaporation amount of the liquid medicine and the amount of liquid medicine replenishment reach a dynamic balance, discharge non-condensable gas and condensed water, discharge the water vapor to the heat exchanger 6 through the first effect condenser pipe 16 and the second effect condenser pipe 17 for condensation, and discharge the condensed water to the inside of the liquid receiving tank 7 to ensure that the vacuum state of the system is not destroyed. After evaporation for about 2 hours, open the exhaust valve of the first effect heater to discharge the non-condensable gas;

[0050] Cream collection operation stage:

[0051] Close the feed valves and steam valves of the first and second effects, increase the vacuum degree of the first effect, close the high-altitude butterfly valve, open the vacuum bypass valve, increase the vacuum degree of the first effect, open the vacuum valve of the storage tank at the bottom of the first effect evaporation chamber 2, and open the second effect emptying valve at the same time to destroy the vacuum degree of the second effect evaporation chamber 5. Pump all the liquid in the second effect heater 4 into the storage tank at the bottom of the first effect evaporation chamber 2, so that the liquid is heat circulated in the first effect alone, and after the liquid evaporates to the required relative density, the discharge operation can be carried out.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-effect vacuum concentration device, comprising a feed pipe (12), characterized in that: The feed pipe (12) is externally connected to a first-effect circulation pipe (13), a first-effect heater (1) is externally arranged on the first-effect circulation pipe (13), a first-effect evaporation chamber (2) is provided on a side of the first-effect circulation pipe (13) away from the first-effect heater (1), a first-effect upper pipe box outlet is externally arranged on the first-effect heater (1), the first-effect upper pipe box outlet is connected to the first-effect evaporation chamber (2), a first-effect to second-effect pipe (15) and a first-effect to condensation pipe (16) are externally arranged on the first-effect evaporation chamber (2), a second-effect heater (4) is connected to the first-effect to second-effect pipe (15) on a side away from the first-effect evaporation chamber (2), and a heat exchanger (6) is connected to the first-effect to condensation pipe (16) on a side away from the first-effect evaporation chamber (2); A second-effect circulation pipe (14) is arranged below the second-effect heater (4), and the second-effect circulation pipe (14) is connected to the second-effect evaporation chamber (5) at a side away from the second-effect heater (4). A second-effect upper pipe box outlet is arranged outside the second-effect heater (4), and the second-effect upper pipe box outlet is connected to the second-effect evaporation chamber (5). A second-effect inlet condensation pipe (17) is arranged outside the second-effect evaporation chamber (5), and the second-effect inlet condensation pipe (17) is connected to a heat exchanger (6) at a side away from the second-effect evaporation chamber (5). The second-effect inlet condensation pipe (17) is connected to the second-effect heater (4) and the second-effect heater (4) through a pipeline, and the second-effect heater (4) and the collection tank (8) are connected through a pipeline. A liquid receiving tank (7) is arranged below the heat exchanger (6), and the outside of the liquid receiving tank (7) is connected to a water ring vacuum pump (9).

2. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A control valve is arranged outside the pipeline, and the control valve is arranged in two groups. One group of control valves is used to control the passage between the second-effect inlet condenser pipe (17) and the collecting tank (8), and the other group of control valves is used to control the passage between the second-effect heater (4) and the collecting tank (8) and the second-effect inlet condenser pipe (17).

3. The double-effect vacuum concentration equipment according to claim 1, characterized in that: The side of the water ring vacuum pump (9) away from the liquid receiving tank (7) is connected to a circulating water tank (10), and a control valve is provided between the water ring vacuum pump (9) and the circulating water tank (10).

4. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A first-effect discharge pipe is arranged outside the first-effect evaporation chamber (2), and the first-effect discharge pipe is connected with the first-effect inlet pipe (15) and the first-effect inlet condenser pipe (16). A vapor-liquid separator (3) is arranged outside the first-effect discharge pipe, and the vapor-liquid separator (3) separates the evaporated material, and the separated liquid is put into the first-effect evaporation chamber (2) through circulation downward.

5. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A second-effect discharge pipe is arranged outside the second-effect evaporation chamber (5), and the second-effect discharge pipe is connected to the second-effect condensation inlet pipe (17). A vapor-liquid separator (3) is arranged outside the second-effect discharge pipe, and the vapor-liquid separator (3) separates the evaporated material, and after separation, the liquid is put into the second-effect evaporation chamber (5) through circulation downward.

6. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A sewage discharge pipe (11) is provided between the first-effect circulation pipe (13) and the second-effect circulation pipe (14), and a control valve is provided outside the sewage discharge pipe (11).

7. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A control valve is arranged outside the first-effect to second-effect pipe (15).

8. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A control valve is arranged outside the first-effect condenser pipe (16).

9. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A control valve is arranged outside the second-effect condenser inlet pipe (17).

10. The double-effect vacuum concentration equipment according to claim 1, characterized in that: A control valve is provided between the heat exchanger (6) and the liquid receiving tank (7), and a vacuum valve is provided between the water ring vacuum pump (9) and the liquid receiving tank (7).

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