Horizontal tube falling film evaporator capable of being cleaned on line

Abstract

The utility model discloses a horizontal tube falling film evaporator capable of being cleaned on line, which comprises a first evaporation unit, a second evaporation unit and a third evaporation unit which are sequentially adjacent and independently arranged in a shell, each evaporation unit comprises an effect hot chamber and an effect cold chamber, and a falling film liquid distributor is arranged on the upper portion of each effect cold chamber. The falling film liquid distributor is communicated with a liquid inlet pipe and a cleaning pipe which are connected in parallel; the lower part of the effective cooling chamber is communicated with a liquid outlet pipe and a waste liquid pipe which are connected in parallel; wherein valves are respectively arranged at the upper parts of the effective heat chambers of the first evaporation unit and the second evaporation unit and are communicated with a steam inlet pipe; the effect cold chamber of the first evaporation unit and the effect hot chamber of the second evaporation unit are respectively provided with valves which are communicated with the effect hot chamber of the third evaporation unit; by reasonably setting the steam series connection mode, the scaling of the multi-effect evaporator can be cleaned only by switching the opening of the valve on the premise of not stopping, and the operation efficiency guarantee of the multi-effect evaporator is met.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, in particular to a horizontal tube falling film evaporator which can be cleaned online. Background Art

[0002] The horizontal tube falling film evaporator is an evaporation equipment commonly used in the chemical, environmental protection, pharmaceutical, water treatment and other industries. Its working principle is as follows: the feed liquid is sprayed onto the heat exchange tube bundle through the spray film device and flows from top to bottom along the outer wall of each heat exchange tube, and naturally forms a film under the action of gravity; the heating steam enters each heat exchange tube through the distribution chamber, and the heating steam and the feed liquid film exchange heat through the tube wall of the heat exchange tube. After the heating steam exchanges heat, it condenses to form condensed water; the condensed water enters the recovery chamber and the distribution chamber along the heat exchange tube and is discharged; the liquid film in the evaporation chamber absorbs a large amount of heat, and the temperature rises rapidly, boiling and evaporating, and the remaining liquid is the concentrated liquid of the feed liquid and is discharged from the concentrated liquid outlet, and the secondary steam is discharged from the secondary steam outlet or further utilized.

[0003] However, when evaporating a high-concentration solution, the outer wall of the heat exchange tube is usually accompanied by solid precipitation of crystals. Currently, after scaling, the horizontal tube falling film evaporator usually needs to be stopped for cleaning, which limits the normal and efficient operation of the evaporator. Utility Model Content

[0004] The utility model aims to provide a horizontal tube falling film evaporator which can be cleaned online, so as to solve the defects of the horizontal tube falling film evaporator in the prior art that it relies on stopping for cleaning and has low operating efficiency.

[0005] To achieve the above purpose, the scheme of the utility model is as follows:

[0006] The horizontal tube falling film evaporator capable of online cleaning comprises a first evaporation unit, a second evaporation unit and a third evaporation unit which are adjacent to each other and independently arranged in a shell, each evaporation unit comprises a heat effect chamber and a cold effect chamber, a falling film liquid distributor is arranged at the upper part of the cold effect chamber, the falling film liquid distributor is connected with a parallel liquid inlet pipe and a cleaning pipe, and a parallel liquid outlet pipe and a waste liquid pipe are connected at the lower part of the cold effect chamber; wherein:

[0007] The upper parts of the effective heat chambers of the first evaporation unit and the second evaporation unit are respectively provided with valves connected to the steam inlet pipe; the effective cold chamber of the first evaporation unit and the effective heat chamber of the second evaporation unit are respectively provided with valves connected to the effective heat chamber of the third evaporation unit.

[0008] Furthermore, the horizontal tube falling film evaporator also includes a fourth evaporation unit, and the effective cold chamber of the second evaporation unit and the effective hot chamber of the third evaporation unit are respectively provided with valves to communicate with the effective hot chamber of the fourth evaporation unit.

[0009] Preferably, the cooling effect chamber of the fourth evaporation unit is connected to a secondary steam pipe.

[0010] More preferably, the heat effect chamber of the fourth evaporation unit is connected to the secondary steam pipe.

[0011] More preferably, the cooling effect chamber of the third evaporation unit is communicated with the secondary steam pipe.

[0012] Further, the cleaning pipe includes a cleaning pipe 1, a cleaning pipe 2 and a cleaning pipe 3 connected in parallel; and / or, the waste liquid pipe includes a waste liquid pipe 1, a waste liquid pipe 2 and a waste liquid pipe 3 connected in parallel.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The horizontal tube falling film evaporator of the utility model can clean the scaling of the effect cold chamber by switching the opening of the valve without stopping the machine through reasonable arrangement of the steam series connection mode, thereby meeting the operation efficiency guarantee of the multi-effect evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is an overall schematic diagram of a horizontal tube falling film evaporator capable of online cleaning.

[0016] Among them: 10, steam inlet pipe; 11, return pipe; 12, secondary steam pipe; 13, connecting pipe 1; 14, connecting pipe 2; 15, connecting pipe 3; 20, heat exchange tube; 30, falling film liquid distributor; 1a, liquid inlet pipe; 1b, liquid outlet pipe; 2a, cleaning pipe 1; 2b, waste liquid pipe 1; 3a, cleaning pipe 2; 3b, waste liquid pipe 2; 4a, cleaning pipe 3; 4b, waste liquid pipe 3; K1, valve 1; K2, Valve two; K3, valve three; K4, valve four; K5, valve five; K6, valve six; K7, valve seven; K8, valve eight; K9, valve nine; 100, shell; 111, first effect heat chamber; 121, first effect cold chamber; 112, second effect heat chamber; 122, second effect cold chamber; 113, third effect heat chamber; 123, third effect cold chamber; 114, fourth effect heat chamber; 124, fourth effect cold chamber. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] It should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be determined according to specific circumstances.

[0020] In one embodiment, Figure 1 As shown, a horizontal tube falling film evaporator that can be cleaned online is provided, including a first evaporation unit, a second evaporation unit, and a third evaporation unit that are adjacent to each other and independently arranged in a shell 100; each evaporation unit is provided with a heat exchange tube 20 to divide the cavity into a heat effect chamber and a cold effect chamber. The heat effect chamber is used to input heating steam to provide heat exchange for the cold effect chamber and realize condensation and discharge of return water, and the cold effect chamber is used to input liquid to be evaporated to achieve heating and concentration. A falling film liquid distributor 30 is provided at the upper part of the cold effect chamber, and the falling film liquid distributor 30 is connected with a parallel liquid inlet pipe 1a and a cleaning pipe, and the lower part of the cold effect chamber is connected with a parallel liquid outlet pipe 1b and a waste liquid pipe; wherein: the upper parts of the heat effect chambers of the first evaporation unit and the second evaporation unit are respectively provided with valves to communicate with the steam inlet pipe 10; the cold effect chamber of the first evaporation unit and the heat effect chamber of the second evaporation unit are respectively provided with valves to communicate with the heat effect chamber of the third evaporation unit.

[0021] In the above embodiment, the horizontal tube falling film evaporator can clean the scale in the cooling chamber without stopping the machine by reasonably setting the steam series mode and switching different steam sources by adjusting the valve opening, thereby meeting the operating efficiency guarantee of the multiple-effect evaporator.

[0022] Specifically, in the above embodiment, the first evaporation unit includes a first heat effect chamber 111 and a first cold effect chamber 121, the second evaporation unit includes a second heat effect chamber 112 and a second cold effect chamber 122; the third evaporation unit includes a third heat effect chamber 113 and a third cold effect chamber 123. The first heat effect chamber 111 and the second heat effect chamber 112 are respectively provided with a valve 1 K1 and a valve 2 K2 on the upper part thereof to connect with the steam inlet pipe 10; the first cold effect chamber 121 and the third heat effect chamber 113 are provided with a connecting pipe 13, and a valve 4 K4 is provided at a position close to the third heat effect chamber 113; the second heat effect chamber 112 is provided with a valve 3 K3 to connect with the connecting pipe 13. The bottoms of all heat effect chambers are connected with the return pipe 11, and the bottoms of all cold effect chambers are connected with the liquid outlet pipe 1b. Generally, when cleaning the cold effect chamber, it is not necessary to provide steam to the hot effect chamber. Therefore, when working, if cleaning the first cold effect chamber 121, close valve one K1, open other valves, switch the upper liquid inlet pipe to the cleaning pipe, and switch the lower liquid outlet pipe to the waste liquid pipe to start cleaning. Similarly, when cleaning the second cold effect chamber 122, close valve two K2 and valve three K3, open valve one K1 and valve four K4 and then perform the cleaning step; when cleaning the third cold effect chamber 123, close valve four K4 and then perform the cleaning step.

[0023] As a preferred embodiment, the horizontal tube falling film evaporator described in the above embodiment further includes a fourth evaporation unit similar to the third evaporation unit, which is used to ensure the multi-effect evaporation efficiency of the parking cleaning operation. Figure 1 As shown, the fourth evaporation unit includes a fourth effect heat chamber 114 and a fourth effect cold chamber 124; the second effect cold chamber 122 is provided with a connecting pipe 2 14 to communicate with the fourth effect heat chamber 114, and a valve 6 K6 is provided at the connecting pipe 2 14 near the fourth effect heat chamber 114, and the third effect heat chamber 113 is connected with the connecting pipe 2 14 through a valve 5 K5. Similarly, when the fourth evaporation unit is working, the second effect cold chamber 122 or the third effect heat chamber 113 provides a steam source, and when cleaning, the fourth effect cold chamber 124 can close the steam source.

[0024] In a more preferred embodiment, the fourth effect cold chamber 124 is provided with a valve nine K9 connected to the secondary steam pipe 12 for discharging excess secondary steam. Similarly, the third effect cold chamber 123 is connected to the secondary steam pipe 12 by providing a valve eight K8, and the fourth effect hot chamber 114 is provided with a valve seven K7 and connected to the front end of the valve eight K8, for discharging excess secondary steam in the front evaporation unit when the fourth effect cold chamber 124 is cleaned.

[0025] As a preferred embodiment, the cleaning pipe includes a parallel cleaning pipe 1 2a, a cleaning pipe 2 3a and a cleaning pipe 3 4a; acid, surfactant and clean water can be respectively introduced to achieve multiple rounds of cleaning to ensure the descaling effect. Correspondingly, the waste liquid pipe includes a parallel waste liquid pipe 1 2b, a waste liquid pipe 2 3b and a waste liquid pipe 3 4b, which are used to discharge the cleaning waste liquid respectively for post-processing.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The horizontal tube falling film evaporator which can be cleaned online is characterized by: The invention comprises a first evaporation unit, a second evaporation unit and a third evaporation unit which are adjacent to each other and independently arranged in a housing (100), each evaporation unit comprises a heat effect chamber and a cold effect chamber, a falling film liquid distributor (30) is arranged at the upper part of the cold effect chamber, the falling film liquid distributor (30) is connected to a parallel liquid inlet pipe (1a) and a cleaning pipe, and a parallel liquid outlet pipe (1b) and a waste liquid pipe are connected to the lower part of the cold effect chamber; wherein: The upper parts of the heat-effect chambers of the first evaporation unit and the second evaporation unit are respectively provided with valves connected to the steam inlet pipe (10); the cold-effect chamber of the first evaporation unit and the heat-effect chamber of the second evaporation unit are respectively provided with valves connected to the heat-effect chamber of the third evaporation unit.

2. The horizontal tube falling film evaporator according to claim 1, characterized in that: It also includes a fourth evaporation unit. The cold effect chamber of the second evaporation unit and the hot effect chamber of the third evaporation unit are respectively provided with valves to communicate with the hot effect chamber of the fourth evaporation unit.

3. The horizontal tube falling film evaporator according to claim 2, characterized in that: The cooling effect chamber of the fourth evaporation unit is connected to a secondary steam pipe (12).

4. The horizontal tube falling film evaporator according to claim 3, characterized in that: The heat-effect chamber of the fourth evaporation unit is in communication with the secondary steam pipe (12).

5. The horizontal tube falling film evaporator according to claim 3, characterized in that: The cooling effect chamber of the third evaporation unit is in communication with the secondary steam pipe (12).

6. The horizontal tube falling film evaporator according to claim 1 or 2, characterized in that: The cleaning pipe includes a cleaning pipe 1 (2a), a cleaning pipe 2 (3a) and a cleaning pipe 3 (4a) connected in parallel; and / or the waste liquid pipe includes a waste liquid pipe 1 (2b), a waste liquid pipe 2 (3b) and a waste liquid pipe 3 (4b) connected in parallel.

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