Single-effect evaporator

Abstract

The utility model provides a single-effect evaporator which comprises an evaporator body, the evaporator body comprises a heating chamber and an evaporation chamber, an upper tube plate and a lower tube plate are arranged between the evaporation chamber and the heating chamber and at the bottom of the heating chamber respectively, and a central circulating tube and a group of heating tube bundles are arranged in the heating chamber. A bottom-in stirrer is arranged at the bottom of the evaporator body, a stirring shaft of the bottom-in stirrer extends into the central circulating pipe, a feeding hole and a steam outlet are formed in the top of the evaporator body, and a discharging hole is formed in the side surface of the bottom of the evaporator body; a steam inlet and a condensate outlet are formed in the two sides of the heating chamber respectively, a temperature sensor port and a pressure gauge port are formed in the heating chamber, and the temperature and the pressure of the heating chamber are detected through a temperature sensor and a pressure gauge. According to the utility model, the evaporation rate can be controlled by adjusting the speed and mode of bottom stirring, and the steam conveying speed can be controlled in an interlocked manner by detecting the temperature and the pressure.

Description

Technical Field

[0001] The utility model relates to the field of single-effect evaporators, in particular to a single-effect evaporator which can be applied to a sugar solution concentration process. Background Art

[0002] Evaporation is the center of the thermal system of the sugar factory. It is not only a consumer of high-temperature steam, but also a supply station of low-temperature steam, and the main source of boiler water and other process water. With the rapid development of industrial technology, the evaporation system and equipment of the sugar factory are constantly improving and innovating, and there are many types. In reality, there are single-effect evaporators, double-effect evaporators, triple-effect evaporators, quadruple-effect evaporators, etc. Among them, the single-effect evaporator generally refers to a single evaporator, and the secondary steam generated when the solution is evaporated is no longer used. Single-effect evaporators are generally suitable for small-scale production, but the single-effect evaporators on the market currently generally have unsatisfactory evaporation effects and lack of material stirring effects, which increases the evaporation time and reduces the evaporation efficiency. In addition, it is inconvenient to clean and repair, which is not conducive to improving the progress of enterprise production and processing. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a single-effect evaporator, which can control the evaporation rate, prevent material precipitation, and increase the evaporation rate.

[0004] The technical solution provided by the utility model is as follows: a single-effect evaporator comprises an evaporator body, wherein the evaporator body comprises a heating chamber and an evaporation chamber which are arranged in sequence from bottom to top, an upper tube plate and a lower tube plate which are vertically connected to the evaporator body are respectively arranged between the evaporation chamber and the heating chamber and at the bottom of the heating chamber, a central circulation pipe which coincides with the axis of the evaporator body and a group of heating tube bundles arranged around the central circulation pipe are arranged in the heating chamber, a bottom-entry agitator is arranged at the bottom of the evaporator body, and the agitation shaft of the bottom-entry agitator extends into the central circulation pipe, a feed port, a steam outlet and a first liquid level sensor port are arranged at the top of the evaporator body, a discharge port and a second liquid level sensor port are arranged at the bottom side of the evaporator body, a steam inlet and a condensate outlet are respectively arranged on both sides of the heating chamber, a temperature sensor port and a pressure gauge port are arranged on the heating chamber, and the temperature and pressure of the heating chamber are detected by the temperature sensor and the pressure gauge to control the steam input amount.

[0005] Furthermore, the bottom-entry agitator includes a motor, a reducer and a frame, the motor is connected to the reducer, one end of the frame is connected to the reducer flange, and the other end is connected to the evaporator body flange, the stirring shaft passes through the reducer shaft hole and is fixed with double nuts, the other end of the stirring shaft extends into the evaporator body, and the stirring shaft extends into the port in the evaporator body and is connected to the stirring blade.

[0006] Furthermore, the frame adopts a double-pivot frame, and the reducer adopts a horizontal turbine reducer.

[0007] Furthermore, a cleaning port and a condensed water inlet are also provided on the top of the evaporator body.

[0008] Furthermore, a manhole, a sampling port and a spare port are arranged on the body of the evaporator body, and a sight glass for observation is arranged on the surface of the evaporator body.

[0009] Furthermore, the heating chamber is also provided with a non-condensable gas outlet.

[0010] Furthermore, the temperature sensor and the pressure gauge are interlocked with the control valve on the steam inlet pipe of the heating chamber and are respectively connected to the PLC control system for automatic control.

[0011] Furthermore, the first liquid level sensor port and the second liquid level sensor port are respectively installed with liquid level sensors, and the two liquid level sensors are interlocked with the control valves on the feed pipe and the discharge pipe and are respectively connected to the PLC control system for automatic control.

[0012] Beneficial effects of the utility model:

[0013] (1) The utility model is provided with a bottom-entry agitator, so that the feed liquid is accelerated to circulate in the evaporator, which not only helps to achieve uniform heating and mixing of the feed liquid in the evaporation chamber, but also improves the evaporation efficiency, prevents material precipitation, and realizes the control of the evaporation rate;

[0014] (2) The first liquid level sensor port and the second liquid level sensor port of the utility model are respectively equipped with liquid level sensors, and the two liquid level sensors are interlocked with the control valves on the feed pipe and the discharge pipe to effectively and automatically control the feed and discharge speeds, thereby improving the heat exchange effect and evaporation rate of the feed liquid and saving production costs;

[0015] (3) The temperature sensor and pressure gauge provided in the utility model are interlocked with the control valve on the steam inlet pipe of the heating chamber to effectively control the steam intake rate, ensure the evaporation efficiency and reduce the heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a main structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0018] In the figure: 1—heating chamber, 2—evaporation chamber, 3—upper tube sheet, 4—lower tube sheet, 5—central circulation pipe, 6—heating tube bundle, 7—bottom-entry agitator, 701—motor, 702—reducer, 703—frame, 704—agitation shaft, 705—agitation blade, 8—feed port, 9—steam outlet, 10—first liquid level sensor port, 11—discharge port, 12—second liquid level sensor port, 13—steam inlet, 14—condensate outlet, 15—temperature sensor port, 16—pressure gauge port, 17—cleaning port, 18—condensate inlet, 19—manhole, 20—sampling port, 21—spare port, 22—sight glass, 23—non-condensable gas outlet. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limiting the present invention. In order to better illustrate the specific implementation methods of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Based on the specific implementation methods of the present invention, all other specific implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1 and Figure 2A single-effect evaporator shown includes an evaporator body, which includes a heating chamber 1 and an evaporation chamber 2 arranged in sequence from bottom to top, an upper tube sheet 3 and a lower tube sheet 4 vertically connected to the evaporator body are respectively arranged between the evaporation chamber 2 and the heating chamber 1 and at the bottom of the heating chamber 1, a central circulation pipe 5 with the axis of the evaporator body coinciding with the axis of the evaporator body and a group of heating tube bundles 6 arranged around the central circulation pipe 5 are arranged in the heating chamber 1, a bottom-entry agitator 7 is arranged at the bottom of the evaporator body, and the stirring shaft of the bottom-entry agitator 7 extends into the central circulation pipe 5, a feed port 8, a steam outlet 9 and a first liquid level sensor port 10 are arranged on the top of the evaporator body, a discharge port 11 and a second liquid level sensor port 12 are arranged on the bottom side of the evaporator body, a steam inlet 13 and a condensate outlet 14 are respectively arranged on both sides of the heating chamber 1, and a temperature sensor port 15 and a pressure gauge port 16 are arranged on the heating chamber 1, and the temperature and pressure of the heating chamber 1 are detected by the arranged temperature sensor and pressure gauge to control the steam input amount.

[0023] The bottom-entry agitator 7 includes a motor 701, a reducer 702 and a frame 703. The motor 701 is connected to the reducer 702. One end of the frame 703 is connected to the reducer 702 flange, and the other end is connected to the evaporator body flange. The stirring shaft 704 passes through the shaft hole of the reducer 702 and is fixedly installed with double nuts. The installation is more convenient and quicker than the usual coupling connection method, and the concentricity is easy to ensure, and it is convenient for later maintenance and repair. The other end of the stirring shaft 704 extends into the evaporator body, and the stirring shaft 704 extends into the port in the evaporator body and is connected to the stirring blade 705.

[0024] The frame 703 adopts a double-pivot frame, and the reducer 702 adopts a horizontal turbine reducer. The horizontal turbine reducer occupies less space and is conducive to the use of the narrow space at the bottom.

[0025] The top of the evaporator body is also provided with a cleaning port 17 and a condensed water inlet 18. The barrel of the evaporator body is provided with a manhole 19, a sampling port 20 and a spare port 21, and the surface of the evaporator body is provided with a sight glass 22 for observation. The heating chamber 1 is also provided with a non-condensable gas outlet 23.

[0026] The temperature sensor and the pressure gauge are interlocked with the control valve on the steam inlet pipe of the heating chamber and are respectively connected to the PLC control system for automatic control. The first liquid level sensor port and the second liquid level sensor port are respectively installed with liquid level sensors, and the two liquid level sensors are interlocked with the control valve on the feed pipe and the discharge pipe and are respectively connected to the PLC control system for automatic control.

[0027] In a specific embodiment, five sight glasses 22 are provided, one is provided on the top surface of the evaporator body, four are provided on the barrel of the evaporator body, and a plurality of spare ports 21 are provided.

[0028] When the utility model is used, the bottom discharge port 11 is closed, and the material liquid enters the heating tube bundle 6 from the feed port 8, so that the material reaches a certain height of the inner cavity of the evaporation chamber 2 (not exceeding the height of the first liquid level gauge interface), and the motor 701 is turned on to start the stirring blade 705 to continuously introduce steam into the steam inlet 13, and the steam enters to exchange heat with the material in the heating chamber 1, and flows out from the condensate outlet 14 after condensation. Specifically, during the heating process, the material moves downward along the inner wall of the central circulation pipe 5 to exchange heat with the steam, and the density difference between the tube-side liquid in the heating tube bundle 6 and the liquid in the central circulation pipe 5 causes the tube-side solution to perform a cyclic motion of descending along the central circulation pipe 5 and ascending along the heating tube bundle 6, and continuously exchanges heat with the steam and condenses, wherein the concentrated material steam is discharged from the steam outlet 9; the temperature sensor and the pressure gauge are interlocked with the control valve on the steam inlet pipe of the heating chamber to control the input speed of the steam to ensure the evaporation rate, and the evaporation rate can also be controlled by adjusting the speed and mode of the bottom stirring. When rapid evaporation is required, the stirring intensity can be increased; when stable evaporation is required, the appropriate stirring speed can be maintained.

[0029] Finally, a sample is taken from the sampling port 20. When the material meets the concentration, the bottom discharge port is opened to collect the material. While the material is discharged, the material is fed from the material inlet, so that the material can be continuously evaporated and concentrated in the evaporator body, which greatly improves the effective utilization rate of the evaporator body.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-effect evaporator, comprising an evaporator body, wherein the evaporator body comprises a heating chamber (1) and an evaporation chamber (2) arranged in sequence from bottom to top, characterized in that: An upper tube plate (3) and a lower tube plate (4) vertically connected to the evaporator body are respectively arranged between the evaporation chamber (2) and the heating chamber (1) and at the bottom of the heating chamber (1); a central circulation pipe (5) coincident with the axis of the evaporator body and a group of heating tube bundles (6) arranged around the central circulation pipe (5) are arranged in the heating chamber (1); a bottom-entry agitator (7) is arranged at the bottom of the evaporator body, and the agitator shaft of the bottom-entry agitator (7) extends into the central circulation pipe (5); and the evaporator body A feed port (8), a steam outlet (9) and a first liquid level sensor port (10) are arranged at the top of the evaporator body, a discharge port (11) and a second liquid level sensor port (12) are arranged at the bottom side of the evaporator body, a steam inlet (13) and a condensate outlet (14) are arranged on both sides of the heating chamber (1), and a temperature sensor port (15) and a pressure gauge port (16) are arranged on the heating chamber (1). The temperature and pressure of the heating chamber (1) are detected by the arranged temperature sensor and pressure gauge to control the steam input amount.

2. The single-effect evaporator according to claim 1, characterized in that: The bottom-entry agitator (7) comprises a motor (701), a reducer (702) and a frame (703); the motor (701) and the reducer (702) are connected; one end of the frame (703) is flange-connected to the reducer (702), and the other end is flange-connected to the evaporator body; the agitator shaft (704) passes through the shaft hole of the reducer (702) and is fixedly installed by means of double nuts; the other end of the agitator shaft (704) extends into the evaporator body; and the port of the agitator shaft (704) extending into the evaporator body is connected to the agitator blade (705).

3. The single-effect evaporator according to claim 2, characterized in that: The frame (703) is a double-support frame, and the reducer (702) is a horizontal turbine reducer.

4. The single-effect evaporator according to claim 1, characterized in that: The top of the evaporator body is also provided with a cleaning port (17) and a condensed water inlet (18).

5. The single-effect evaporator according to claim 1, characterized in that: A manhole (19), a sampling port (20) and a standby port (21) are arranged on the body of the evaporator, and a sight glass (22) for observation is arranged on the surface of the evaporator.

6. The single-effect evaporator according to claim 1, characterized in that: The heating chamber (1) is also provided with a non-condensable gas outlet (23).

7. The single-effect evaporator according to claim 1, characterized in that: The temperature sensor and the pressure gauge are interlocked with the control valve on the steam inlet pipe of the heating chamber and are respectively connected to the PLC control system for automatic control.

8. The single-effect evaporator according to claim 1, characterized in that: The first liquid level sensor port and the second liquid level sensor port are respectively installed with liquid level sensors, and the two liquid level sensors are interlocked with the control valves on the feed pipe and the discharge pipe and are respectively connected to the PLC control system for automatic control.

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