CN204910802U - Self -circulation MVR heat pump evaporation system - Google Patents

Abstract

The utility model relates to a self -circulation MVR heat pump evaporation system, including the pre -heater that preheats stoste, the heat exchanger who is connected with the pre -heater and the cyclone who is connected with heat exchanger, the export of pre -heater connects to the cyclone entry of cyclone lower part through the tube side of pipeline through heat exchanger, cyclone's well upper portion behind the filtering layer by the cyclone gas outlet connect to the import of roots's fan, the export of roots's fan connects to cyclone's top import through the shell side of pipeline through heat exchanger, the leakage fluid dram of heat exchanger shell side connect to the condensate case, the heat exchange line that the leakage fluid dram of condensate case passes through among the preheater discharges. The utility model discloses a roots's fan provides depressurized environment with the inside evacuation of equipment to reduce the stoste boiling point, reduce the energy consumption, utilize the air behind the circulation heating to give stoste heating among the heat exchanger before the concentrated operating mode, abandoned to external world steam and auxiliary electric heater's reliance.

Description

A self-circulating MVR heat pump evaporation system

technical field

The utility model relates to a self-circulating MVR heat pump evaporation system, which belongs to the technical field of evaporation and energy saving.

Background technique

In recent years, with the increasing demand for energy, the contradiction between economic development and resource shortage has become increasingly acute, and energy supply has become a bottleneck problem. At the same time, greenhouse gas emissions cause global warming. Faced with such a situation, energy saving has become one of the important ways to get rid of the shackles of energy shortage. In addition, as the steam market price continues to rise in recent years, the operating costs of enterprises have increased sharply. Therefore, reducing the operating cost of the device, saving energy and reducing consumption are the problems that need to be solved in the current evaporation and concentration process.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a self-circulating MVR heat pump evaporation system, which uses the pressure difference of the system to realize self-circulation. Effectively improve the utilization rate of energy.

In order to solve the above technical problems, the utility model provides a self-circulating MVR heat pump evaporation system, which includes a preheater for preheating the raw liquid, a heat exchanger connected to the preheater and a cyclone separator connected to the heat exchanger. A first valve is provided on the preheater, the heat exchanger includes a tube side and a shell side, a second valve is provided between the heat exchanger and the cyclone separator, and the outlet of the preheater is heat exchanged through a pipeline. The tube side of the cyclone separator is connected to the cyclone separator inlet at the lower part of the cyclone separator, and the middle and upper part of the cyclone separator is connected to the inlet of the Roots blower through the air outlet of the cyclone separator after passing through the filter layer, and the outlet of the Roots blower passes through The pipeline is connected to the top inlet of the cyclone separator through the shell side of the heat exchanger, and the drain port of the shell side of the heat exchanger is connected to the condensate tank, and the drain port of the condensate tank passes through the pre-heater The heat exchange pipeline in the discharge is discharged; among them, the raw liquid of the nuclear industrial wastewater is preheated by the preheater and then enters the inlet of the heat exchanger tube side, and in the tube side, the raw liquid enters the cyclone separator from the tube side outlet through evaporation, The steam in the cyclone separator enters the Roots blower, and thus enters the shell side of the heat exchanger to form a cycle.

The technical scheme further defined by the utility model is: the condensate tank is connected with the Roots blower through a pipeline, and a nozzle for spraying condensed water to the Roots blower is provided at the end of the pipeline; the outlet of the Roots blower A pulsation damper is installed between the heat exchanger and the pulsation damper communicates with the shell side and the tube side of the heat exchanger at the same time.

Further, a liquid level gauge is provided between the cyclone separator and the heat exchanger, the condensate tank is connected to the liquid level gauge, and one end of the liquid level gauge is connected to the cyclone separator through a pipeline (communicated with the upper part of the tube side of the heat exchanger) ), the other end is connected to the lower part of the tube side of the heat exchanger through a pipeline, which is used to measure the liquid level of the tube side of the heat exchanger; at the same time, the condensate tank is connected to the liquid level gauge through a pipeline, and the condensate tank can be used in the cleaning process Clean the liquid level gauge with clean condensed water.

Further, the filter layer of the cyclone separator includes a first wire mesh demister, a second wire mesh demister, a swirl plate and a deflector in sequence from top to bottom.

Further, the top of the condensate tank is also connected to the shell-side outlet pipeline of the heat exchanger through a three-way air pressure valve, so that the air pressure of the condensate tank and the auxiliary control system can be regulated by means of the valve to make its operation more stable.

When working, it first enters the heating condition, and the raw liquid to be concentrated enters the heat exchanger after passing through the pre-heater, uses the air in the system to heat and pressurize through the Roots blower, and then enters the shell side of the heat exchanger, and the raw liquid on the tube side of the heat exchanger After heating, the air after heat exchange reaches the top of the cyclone separator through the pipeline and then enters the Roots blower for circulation heating. When the temperature of the raw liquid in the tube side of the heat exchanger reaches the evaporation temperature, the system enters the evaporation mode. In evaporation mode, the raw liquid to be concentrated enters the heat exchanger after being preheated by the pre-heater, and the vaporizable components are heated and vaporized and enter the cyclone separator to realize gas-liquid separation. The gas components are filtered and enter the Roots blower, and then undergo heat exchange after compression. The shell side heats the raw liquid in the tube side and then condenses into the condensate tank for continuous circulation, while the liquid returns to the tube side of the heat exchanger. The heat pump cycle system formed in this way can not only realize the concentration of the input liquid through the heat exchange cycle, but also realize the liquid return by gravity when the heat exchanger is higher than the condensate tank, and the outlet of the Roots blower passes through the shell side of the heat exchanger and the condensate tank The micro positive pressure of the communication can make the discharge liquid automatically flow through the pre-heater to preheat the original liquid and then discharge, which not only effectively utilizes the heat contained in the discharge liquid, but also does not need additional infusion power, so the utility model has the advantages of Reasonable use of pressure difference and gravity difference to realize the self-circulation of evaporation and separation process, with significant advantages of low energy consumption and high efficiency. At the same time, in the heating condition, since the shell side of the heat exchanger is connected to the top inlet of the cyclone separator, and then connected to the Roots blower through its air outlet, the pressure fluctuation of the system is small when the system is working, and the cycle of the heat pump system is stable.

The beneficial effects of the utility model are: the system vacuumizes the inside of the equipment through the Roots blower to provide a negative pressure environment to reduce the boiling point of the stock solution and reduce energy consumption; The system is equipped with external power such as pumps, which greatly simplifies the process and facilitates the realization of control; before the concentration working condition, the raw liquid in the heat exchanger is heated by circulating heated air, which eliminates the dependence on external steam and auxiliary electric heaters, saving It also simplifies the structure; the adjustable liquid level gauge is used to control the end point of the concentrated working condition, without repeated sampling and analysis, which is convenient for operation and precise control; the cyclone separator of the utility model adopts four-stage separation, which improves the separation efficiency and further The liquid droplet content in the steam at the outlet of the separator is reduced, the decontamination factor is improved, and the purpose of environmental friendliness is achieved. In addition, since the heat pump evaporation technology adopted in the present invention does not require additional steam, it can reduce product costs and improve economic benefits, so it is widely used in evaporation, concentration and other fields.

Description of drawings

Fig. 1 is the schematic flow sheet of a kind of embodiment of the utility model;

Fig. 2 is the structure schematic diagram of Roots blower replenishing water among Fig. 1;

Fig. 3 is a schematic structural diagram of the cyclone separator in Fig. 1 .

Detailed ways

Example 1

A self-circulating MVR heat pump evaporation system provided in this embodiment, as shown in Figures 1 to 3, includes a preheater 12 for preheating the raw liquid, a heat exchanger 6 connected to the preheater 12, and a heat exchanger 6 The connected cyclone separator 1, the preheater 12 is provided with a first valve 5, the first valve 5 is a first pneumatic ball valve, the heat exchanger 6 includes a tube side and a shell side, and the heat exchanger 6 and the cyclone A second valve is arranged between the separators 1, the second valve is a pneumatic butterfly valve 2 and a manual butterfly valve 3, and the outlet of the preheater 12 is connected to the lower part of the cyclone separator 1 through the pipeline through the tube side of the heat exchanger 6. The inlet of the cyclone separator 1, the middle and upper part of the cyclone separator 1 is connected to the inlet of the Roots blower 10 through the air outlet of the cyclone separator 1 after passing through the filter layer, and the outlet of the Roots blower 10 passes through the pipeline through the heat exchanger The shell side of the heat exchanger 6 is connected to the top inlet of the cyclone separator 1, and the drain port of the shell side of the heat exchanger 6 is connected to the condensate tank 11, and the drain port of the condensate tank 11 passes through the preheater 12 The heat exchange pipeline in the discharge is discharged to preheat the raw liquid in the preheater. The outlet of the Roots blower 10 is respectively connected to the shell-side inlet and the tube-side inlet of the heat exchanger 6 through the first pipeline and the second pipeline, and the second pipeline is provided with a third valve 7, which is the second pneumatic ball valve , the condensed water in the heat exchanger 6 is stored in the condensed liquid tank 11 through the third pipe.

In the utility model, the condensate tank 11 is connected with the Roots blower 10 through a pipeline, and a nozzle 13 for spraying condensed water to the Roots blower 10 is provided at the end of the pipeline, and the second outlet and the fifth pipeline connected, the fifth pipeline passes through the preheater 12, and exchanges heat with the stock solution in the preheater 12 through the fifth pipeline, thereby heating the temperature of the stock solution; the outlet of the Roots blower 10 is installed between the heat exchanger 6 There is a pulse damper 9, and the pulse damper 9 communicates with the first pipeline and the second pipeline at the same time, and the function of the pulse damper 9 is to buffer the outlet steam of the Roots blower 10, so that its flow tends to be stable. A liquid level gauge 8 is arranged between the cyclone separator 1 and the heat exchanger 6. The liquid level gauge 8 includes a high liquid level and a low liquid level. The high liquid level and the low liquid level can be adjusted as needed. The level gauge 8 is connected, one end of the liquid level gauge 8 is connected to the cyclone separator 1 through a pipeline (communicated with the upper part of the heat exchanger tube side), and the other end is connected to the lower part of the heat exchanger 6 tube side through a pipeline for measuring heat exchange At the same time, the condensate tank 11 is connected to the liquid level gauge 8 through a pipeline, and the clean condensate in the condensate tank 11 can be used to clean the liquid level gauge during the cleaning process. The cyclone separator 1 includes a shell, and the first wire mesh demister 14, the second wire mesh demister 15, the swirl plate 16 and the deflector 17 are arranged in the casing from top to bottom, and the outlet of the cyclone separator 1 Connected with the inlet of the Roots blower 10, the steam is heated and pressurized by the Roots blower 10 to form secondary steam to provide heat for system concentration.

In the utility model, the inlet of the Roots blower 10 is negative pressure, and the tube side of the heat exchanger 6 is negative pressure, so as to reduce the boiling point of the stock solution and reduce energy consumption. When the system is started, start the Roots blower 10 to evacuate the whole system, suck the raw liquid into the tube side of the heat exchanger 6 through the shell side of the preheater 12, and the secondary steam obtained by evaporating the raw liquid is compressed by the Roots blower 10, so that the Roots The outlet of the fan 10, the first pipeline, the second pipeline, the shell side of the heat exchanger 6, the tube side of the condensate tank 11 and the preheater 12 are all under positive pressure. In this way, the intake of the raw liquid, the replenishment of the Roots blower 10, and the discharge of the condensed water can be realized through the action of the pressure difference without the power of an external pump.

In the utility model, the stock solution enters the tube side of the heat exchanger 6 after being preheated by the condensate that enters the tube side of the preheater 12 from the fifth pipe through the shell side of the preheater 12, and the stock solution passes through the tube side in the tube side The hot air in the shell side is heated to form steam, and the water vapor at the outlet of the tube side of the heat exchanger 6 enters the cyclone separator 1, and the cyclone separator 1 uses the inlet cyclone to separate the secondary steam, the middle swirl plate 16 to separate, and the upper two The four-stage separation captured by a layer of wire mesh improves the decontamination factor. The water separated by the cyclone separator 1 returns to the tube side of the heat exchanger 6, and the water vapor enters the Roots through the outlet of the cyclone separator 1 on the top. The fan is heated and pressurized, and enters the shell side of the heat exchanger 6, and after heat exchange with the raw liquid of the tube side of the heat exchanger 6, condensed water is generated and enters the condensate tank 11, and part of the condensate in the condensate tank 11 is given to the Roots blower 10 to replenish water; the other part flows into the preheater 12 tube side to preheat the stock solution in the shell side. The heat exchanger 6 communicates with the outside through the sixth pipeline, and the sixth pipeline is provided with a valve.

According to the above method of using the self-circulating MVR heat pump evaporation system, the following steps are included:

(1) Start the Roots blower 10, vacuumize the whole system, open the first valve 5, feed in the preheater 12, and when the liquid level in the heat exchanger 6 reaches the specified liquid level, close the first valve 5 , stop the liquid;

(2) The Roots blower 10 continues to run, open the pneumatic butterfly valve 2 and the third valve 7, adjust the rotating speed of the Roots blower 10, adjust the opening of the manual butterfly valve 3 so that the pressure before and after the Roots blower 10 reaches a specified value, and use the The circulating air in the heat exchanger 6 heats the raw liquid in the tube side, the temperature of the raw liquid gradually increases during the circulating heating process, and the temperature of the circulating air also increases, and when the temperature of the raw liquid reaches the boiling point, it turns into a normal concentrated working condition;

(3) Roots blower 10 continues to run in the concentration mode, close the pneumatic butterfly valve 2 and the third valve 7, and the steam evaporated from the tube side of heat exchanger 6 is separated by cyclone separator 1 and then enters Roots blower 10 for heating and pressurization. Enter the 6 shell side of the heat exchanger to continue heating the tube side stock solution;

(4) When the liquid level gauge 8 detects the low liquid level signal in the heat exchanger, the first valve 5 is controlled to be opened to replenish liquid, and step (3) is repeated;

(5) When the low liquid level signal of the liquid level gauge 8 is sent out for a certain number of times, the first valve 5 is no longer opened, and the system turns into the shutdown discharge mode.

(6) In this embodiment, an automatic defoaming process and an automatic cleaning process are set at the same time. To solve defoaming and cleaning problems.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to allow those familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot limit the protection scope of the present utility model. Under the enlightenment of the technical essence of the present utility model, those skilled in the art may make other changes, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present utility model.

Claims (5)

1. A self-circulating MVR heat pump evaporation system, comprising a preheater for preheating the raw liquid, a heat exchanger connected to the preheater and a cyclone separator connected to the heat exchanger, the heat exchanger comprising a tube side and a shell It is characterized in that: the outlet of the preheater is connected to the inlet of the cyclone separator at the lower part of the cyclone separator through the pipeline through the tube side of the heat exchanger, and the upper and middle parts of the cyclone separator are separated by the cyclone after passing through the filter layer. The air outlet of the device is connected to the inlet of the Roots blower, and the outlet of the Roots blower is connected to the top inlet of the cyclone separator through the shell side of the heat exchanger through the pipeline, and the liquid discharge port of the shell side of the heat exchanger is connected to the condensate tank, and the drain port of the condensate tank is discharged through the heat exchange pipeline in the preheater. 2. The self-circulating MVR heat pump evaporation system according to claim 1, characterized in that: the condensate tank is connected to the Roots blower through a pipeline, and the end of the pipeline is provided to spray condensed water to the Roots blower of the nozzle. 3. The self-circulating MVR heat pump evaporation system according to claim 1, characterized in that: a pulse damper is installed between the outlet of the Roots blower and the heat exchanger, and the pulse damper is connected with the shell side of the heat exchanger at the same time. connected to the tube. 4. The self-circulating MVR heat pump evaporation system according to claim 1, characterized in that: a liquid level gauge is provided between the cyclone separator and the heat exchanger. 5. The self-circulating MVR heat pump evaporation system according to claim 1, characterized in that: the filter layer of the cyclone separator includes a first wire mesh demister and a second wire mesh demister from top to bottom. Devices, swirl plates and deflectors.