Evaporation capacity control system of multi-effect evaporation tower

Abstract

The utility model discloses an evaporation capacity control system of a multi-effect evaporation tower, which comprises a plurality of evaporators which are connected in series, a spraying device is arranged in each evaporator, the bottoms of the plurality of evaporators are connected with a settling separation tank through a concentrated solution output pipeline, and the last-effect evaporator is fed into a full-automatic separator a through a multi-effect liquid pipeline. A concentrated solution of the settling separation tank is conveyed into the next evaporator through a concentrated solution conveying pipeline, sediments in the settling separation tank are conveyed into the full-automatic separator b through a sediment pipeline, and a condenser is arranged at the steam output end of the last-effect evaporator. According to the evaporation capacity control system of the multi-effect evaporation tower, the last-effect evaporator separated by the full-automatic separator b is recycled, condensate water is used as a refrigerant for heat exchange, the temperature of the evaporator is further reduced, when the internal pressure of the evaporator is high and the evaporation capacity is excessive, spraying cooling is carried out on the evaporator, the pressure in the tank and the steam evaporation capacity are reduced, and the evaporation capacity of the multi-effect evaporation tower is improved. Therefore, the effect of evaporation capacity control is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of evaporation tower technical field, specifically a kind of multiple-effect evaporation tower evaporation capacity control system for industrial wastewater treatment. BACKGROUND

[0002] Multiple-effect evaporation is a kind of evaporation operation, the secondary steam of previous effect is used as the heating steam of next effect in series evaporation operation, in multiple-effect evaporation, the operating pressure of each effect, the corresponding heating steam temperature and solution boiling point are successively reduced, multiple-effect evaporator is the chemical term published in 2019, multiple-effect evaporation has the following characteristics: high efficiency energy saving: by using the secondary steam of previous effect as the heat source of next effect, reduce the demand for external heat source, reduce pollution: multiple-effect evaporation system can make full use of latent heat of steam, improve energy efficiency, reduce energy consumption and environmental pollution, wide application range: suitable for processing various types of solution, especially for high concentration solution, multiple-effect evaporation is widely used in chemical industry, food, pharmaceutical and other industries, especially in the treatment of high concentration solution, can significantly improve energy efficiency and reduce operating cost.

[0003] Sodium sulfate-containing wastewater is treated by multiple-effect evaporation, the evaporator outputs steam at the top, and the concentrated liquid is discharged from the bottom into the next effect evaporation tower, the superheat degree of heat source steam in the operation process is too high, which will affect the heating and heat transfer efficiency of the first effect, and the amount of steam in the evaporator will affect the pressure inside the evaporator, resulting in problems such as increased energy consumption, therefore, it is necessary to improve the multiple-effect evaporation tower evaporation capacity control system in the prior art to improve the stability of system operation. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of multiple-effect evaporation tower evaporation capacity control system to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of multiple-effect evaporation tower evaporation capacity control system, including multiple evaporators connected in series, each evaporator is installed with spraying device, the bottom of multiple evaporators is connected with sedimentation separation tank by concentrated liquid output pipeline, the last evaporator is sent into full-automatic separator a by multiple-effect liquid pipeline, the concentrated liquid of sedimentation separation tank is sent into next evaporator by concentrated liquid conveying pipeline, the sediment in sedimentation separation tank is sent into full-automatic separator b by sediment pipeline, the steam output end of last evaporator is provided with condenser, the condenser is provided with non-condensable gas pipeline and condensed water pipeline, the concentrated liquid separated by full-automatic separator b is communicated with each spraying device by circulation pipeline.

[0007] As a further scheme of the utility model: the circulating pipeline is provided with a heat exchanger, a branch line for conveying condensed water to the heat exchanger is connected to the condensed water pipeline, and the concentrated liquid is sent into each spraying device from the circulating pipeline after being cooled by the heat exchanger.

[0008] As a further scheme of the utility model: the circulating pipeline is further provided with a storage tank, and the concentrated liquid passing through the heat exchanger is sent into the storage tank for storage or buffering.

[0009] As a further scheme of the utility model: a straight discharge pipe is arranged on the circulating pipeline in parallel with the heat exchanger and the storage tank, and the straight discharge pipe is communicated with the circulating pipeline through a valve.

[0010] As a further scheme of the utility model: a liquid pump for pressurizing the concentrated liquid is arranged on the circulating pipeline, and a valve is arranged at the connection between the circulating pipeline and each evaporator.

[0011] As a further scheme of the utility model: a reflux pipe is further arranged on the circulating pipeline and communicated with the concentrated liquid conveying pipeline.

[0012] As a further scheme of the utility model: the circulating pipeline is communicated with the input end of the last evaporator of the last-effect evaporator.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] The multi-effect evaporating tower evaporation amount control system separates the last-effect evaporator recovery through the full-automatic separator b, exchanges heat by using condensed water as refrigerant, further reduces the temperature, sprays and cools when the pressure in the evaporator is high and the evaporation amount is excessive, reduces the tank pressure and the steam evaporation amount, and thus the evaporation amount control effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of a multi-effect evaporating tower evaporation amount control system.

[0016] In the drawing: 1, evaporator; 2, feed liquid input pipeline; 3, heating steam pipeline; 4, concentrated liquid output pipeline; 5, sedimentation and separation tank; 6, sediment pipeline; 7, circulating pipeline; 8, steam output pipeline; 9, concentrated liquid conveying pipeline; 10, condenser; 11, non-condensable gas pipeline; 12, condensed water pipeline; 13, multi-effect liquid pipeline; 14, full-automatic separator a; 15, full-automatic separator b; 16, finished liquid pipeline; 17, sodium sulfate crystallization pipeline; 18, spraying device; 19, reflux pipe; 20, straight discharge pipe; 21, storage tank; 22, heat exchanger; 23, branch line. DETAILED DESCRIPTION

[0017] Please refer toFigure 1 The utility model discloses a kind of multi-effect evaporation tower evaporation capacity control systems, including multiple evaporators 1 being mutually connected in series, each evaporator 1 is installed spray device 18, the bottom of multiple evaporators 1 is connected by concentrated liquid output pipeline 4 Sedimentation separation tank 5, last effect evaporator 1 is sent into full-automatic separator a 14 by multi-effect liquid pipeline 13, the concentrated liquid of Sedimentation separation tank 5 is sent into next evaporator 1 by concentrated liquid delivery pipeline 9, deposit in Sedimentation separation tank 5 is sent into full-automatic separator b 15 by sediment pipeline 6, the steam output end of last effect evaporator 1 is provided with condenser 10, condenser 10 is provided with incondensable gas pipeline 11 and condensed water pipeline 12, the concentrated liquid separated by full-automatic separator b 15 is communicated with each spray device 18 by circulation pipeline 7, evaporator 1 is evaporator A, evaporator B and evaporator C respectively, evaporator A is provided with feed liquid input pipeline 2 and heating steam pipeline 3, feed liquid input pipeline 2 and heating steam pipeline 3, the top of evaporator A, evaporator B and evaporator C is provided with steam output pipeline 8, the steam output pipeline 8 of evaporator A is communicated with evaporator B, the steam output pipeline 8 of evaporator B is communicated with evaporator C, evaporator A, evaporator B and evaporator C are communicated by concentrated liquid output pipeline 4, evaporator A, evaporator B and evaporator C are respectively provided with separation tank a, separation tank b and separation tank c, concentrated liquid is transported to next evaporator 1, the concentrated liquid output by evaporator C is sent into full-automatic separator a 14 by multi-effect liquid pipeline 13, the bottom of separation tank a and separation tank b is communicated with full-automatic separator b 15 by sediment pipeline 6, full-automatic separator a 14 and full-automatic separator b 15 are respectively provided with complete liquid pipeline 16 and sodium sulfate crystallization pipeline 17, the concentrated liquid output pipeline 4 of evaporator A, evaporator B and evaporator C is connected with three Sedimentation separation tanks 5 respectively, three Sedimentation separation tanks 5 are separation tank a, separation tank b and separation tank c respectively, the top steam exhaust end of Sedimentation separation tank 5 is communicated with steam output pipeline 8 by pipeline, one side of Sedimentation separation tank 5 is provided with concentrated liquid delivery pipeline 9 being communicated with next evaporator 1, the present application is based on the basis of patent application number 2024227228241 is improved, except that the concentrated liquid separated by full-automatic separator b 15 is communicated with each spray device 18 by circulation pipeline 7, it is all patent technology of application number 2024227228241, not repeat here, the present application separates the concentrated liquid except last effect evaporator 1 from full-automatic separator b 15 as the medium of spray cooling, after the medium after separation process, temperature is much lower than steam temperature in evaporator 1, temperature difference is generated, after entering evaporator 1 in the mode of spray, the temperature in evaporator 1 can be effectively reduced, to reduce its evaporation capacity, reduce the pressure in evaporator 1, reach the effect of controlling evaporation capacity, and spray is concentrated liquid, not water, can effectively reduce evaporation capacity and steam condensation production line pressure.

[0018] In a preferred embodiment, a heat exchanger 22 is arranged on the circulating pipeline 7, a branch line 23 is connected to the condensate pipeline 12 to deliver condensate to the heat exchanger 22, and the concentrated solution is cooled by the heat exchanger 22 and then delivered from the circulating pipeline 7 to the spraying device 18, and the cooling medium of the concentrated solution passing through the heat exchanger 22 is the condensate output from the heat exchanger 22, so that the temperature of the spraying concentrated solution is further reduced, and the condensate of the original production line is used for cooling, thereby reducing the modification cost.

[0019] In a preferred embodiment, the circulating pipeline 7 is further provided with a storage tank 21, and the concentrated solution passing through the heat exchanger 22 is stored or buffered in the storage tank 21, and the pressure in the evaporator 1 needs to be adjusted in real time according to the production environment, so as to avoid excessive internal pressure of the pipeline and cooling of the stored spraying concentrated solution, and therefore the storage tank 21 is added to adjust the recovery and use demand of the concentrated solution.

[0020] In a preferred embodiment, a direct discharge pipeline 20 is arranged on the circulating pipeline 7 in parallel with the heat exchanger 22 and the storage tank 21, the direct discharge pipeline 20 is communicated with the circulating pipeline 7 through a valve, a liquid pump for pressurizing the concentrated solution is arranged on the circulating pipeline 7, a valve is arranged at the connection between the circulating pipeline 7 and each evaporator 1, and a return pipeline 19 is further arranged on the circulating pipeline 7 and communicated with the concentrated solution delivery pipeline 9. When the pressure in the evaporator 1 is appropriate and the evaporation amount is appropriate, if the returned concentrated solution is cooled when passing through the heat exchanger 22 and the storage tank 21, a large amount of heat will be wasted, the evaporation time will be prolonged, the evaporation amount will be reduced, and excessive heat will be required for evaporation, which will increase the energy consumption. Therefore, the direct discharge pipeline 20 is added to make the returned concentrated solution skip the heat exchanger 22 and the storage tank 21 and directly return to the evaporator 1 through the circulating pipeline 7, thereby reducing the heat loss.

[0021] In a preferred embodiment, the circulating pipeline 7 is communicated with the input end of the last evaporator 1, and the returned concentrated solution of the circulating pipeline 7 is output from the previous evaporators, so the purity is not enough. In order to ensure the final purity, the returned concentrated solution is sent back to the previous evaporator 1 to evaporate at least twice, so as to ensure the index of the final evaporator 1.

[0022] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own emphasis. If the description in an individual embodiment is not exhaustive, the description in other embodiments can be referred to.

[0023] The above-described embodiments only express the implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as the limitation of the scope of the present application patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A multi-effect evaporator tower evaporation capacity control system, comprising a plurality of evaporators (1) connected in series, a spraying device (18) is installed in each evaporator (1), the bottoms of the plurality of evaporators (1) are connected to a settling separation tank (5) through a concentrated liquid output pipeline (4), the last-effect evaporator (1) is sent to a full-automatic separator a (14) through a multi-effect liquid pipeline (13), the concentrated liquid of the settling separation tank (5) is sent to the next evaporator (1) through a concentrated liquid conveying pipeline (9), the sediment in the settling separation tank (5) is sent to a full-automatic separator b (15) through a sediment pipeline (6), and the steam output end of the last-effect evaporator (1) is provided with a condenser (10), the condenser (10) is provided with a non-condensable gas pipeline (11) and a condensed water pipeline (12), characterized in that, The concentrated liquid separated by the full-automatic separator b (15) is communicated with each spraying device (18) through a circulating pipeline (7).

2. A multiple-effect evaporative tower evaporation control system as claimed in claim 1, wherein, A heat exchanger (22) is arranged on the circulating pipeline (7), a branch line (23) for delivering condensed water to the heat exchanger (22) is connected to the condensed water pipeline (12), and the concentrated liquid is sent into each spraying device (18) from the circulating pipeline (7) through the heat exchanger (22).

3. A multiple-effect evaporative tower evaporation control system as claimed in claim 2, wherein, The circulating pipeline (7) is further provided with a storage tank (21), and the concentrated liquid passing through the heat exchanger (22) is sent into the storage tank (21) for storage or buffering.

4. The multiple-effect evaporation tower evaporation rate control system of claim 3, wherein, A straight discharge pipeline (20) is arranged on the circulating pipeline (7) in parallel with the heat exchanger (22) and the storage tank (21), and the communication position of the straight discharge pipeline (20) and the circulating pipeline (7) is controlled by a valve.

5. A multiple-effect evaporative tower evaporation control system as in any one of claims 1-4, wherein, A liquid pump for pressurizing the concentrated liquid is arranged on the circulating pipeline (7), and a valve is arranged at the connection position of the circulating pipeline (7) and each evaporator (1).

6. A multiple-effect evaporative tower evaporation control system as set forth in claim 1 wherein, A return pipeline (19) is further arranged on the circulating pipeline (7) and communicated with the concentrated liquid delivery pipeline (9).

7. A multiple-effect evaporative tower evaporative capacity control system as claimed in claim 6, wherein, The circulating pipeline (7) is communicated with the input end of the last evaporator (1) of the final-effect evaporator (1).

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