CN215984128U

CN215984128U - Bidirectional exchange heat exchange system

Info

Publication number: CN215984128U
Application number: CN202122711300.9U
Authority: CN
Inventors: 毛鹏; 王保存; 亓建强; 陈为雷
Original assignee: Chinalco Shandong Engineering Technology Co ltd
Current assignee: Chinalco Shandong Engineering Technology Co ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-03-08
Anticipated expiration: 2031-11-08

Abstract

A bidirectional exchange heat exchange system belongs to the technical field of heat exchanger systems. When the seed precipitation of sodium aluminate is decomposed, carry out the heat exchange through heat exchanger and seed precipitation mother liquor earlier, because contain a small amount of plankton in the sodium aluminate seminal fluid, at seed precipitation cooling heat transfer in-process, can cause AH to separate out and form the scab, cause the heat exchanger heat exchange efficiency to reduce, block up completely even, it is troublesome to stop the clearance and reduce production efficiency and clearance, and the expense is high, and the fragile life that shortens. According to the utility model, the concentrate pump, the first commutator, the heat exchange device, the second commutator and the seed precipitation mother liquor pump are sequentially connected, and the sodium aluminate concentrate and seed precipitation mother liquor flow paths are switched to alternately clean, so that the cleaning effect is good, the efficiency is high, and the service life of the heat exchange device is prolonged.

Description

Bidirectional exchange heat exchange system

Technical Field

A bidirectional exchange heat exchange system belongs to the technical field of heat exchanger systems.

Background

At present, the aluminum-based new material series products are mainly produced by using sodium aluminate concentrate. When the sodium aluminate seminal fluid seed decomposes, will carry out the heat exchange through heat exchanger and seed precipitation mother liquor earlier, because contain a small amount of plankton in the sodium aluminate seminal fluid, at seed precipitation cooling heat transfer in-process, can cause AH to separate out and form the scab, cause the heat exchanger heat exchange efficiency to reduce, block up completely even, consequently need regularly clear up the maintenance. At present, the scab of the heat exchanger is mainly cleaned manually, when the scab of the heat exchanger is cleaned manually, firstly, liquid caustic soda or seed precipitation mother liquor is used for boiling a vehicle to decompose and dissolve the scab as much as possible, and then the scab is cleaned manually. The manual cleaning scab, the maintenance cycle is long, and manual cleaning cost is high, also can cause indirect heating equipment to damage among the cleaning process, life shortens. Because of the long period of manual cleaning scab, in actual production, for not influencing the stable operation of the system, a standby heat exchange device is usually arranged, and the equipment investment amount is increased.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: the defects of the prior art are overcome, the cold side and hot side material flow channel is rapidly switched, scabs are conveniently cleaned, the operation is simple, the heat exchanger efficiency is improved, the service life of the heat exchanger is prolonged, the manual cleaning and overhauling times are reduced, the operation cost is reduced, meanwhile, the number of spare heat exchangers is reduced, and the investment is reduced.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the bidirectional exchange heat exchange system is characterized in that: the device comprises a concentrate pump, a first commutator, a heat exchange device, a second commutator and a seed mother liquor pump; the first commutator and the second commutator respectively comprise a fixed inlet, a fixed outlet and two switching ports, the fixed inlet is communicated with one switching port in a switchable manner, and the fixed outlet is communicated with the other switching port in a switchable manner; the heat exchange device is respectively connected with the switching ports of the first commutator and the second commutator, the semen pump is connected with the fixed inlet of the first commutator, and the seed precipitation mother liquor pump is connected with the fixed inlet of the second commutator.

When the heat exchange is carried out between the sodium aluminate fine liquid and the seed precipitation mother liquid, the sodium aluminate fine liquid firstly enters the first commutator through the fine liquid pump, is pumped out from one of the switching ports and enters the hot side of the heat exchange device, is discharged from the hot side of the heat exchange device, then enters the second commutator from the switching port of the second commutator communicated with the fixed outlet, and is pumped into the next link from the fixed outlet; the seed separation mother liquor enters the second commutator through the seed separation mother liquor pump, flows out from a switching port of the second commutator communicated with the cold side of the heat exchange device, enters the cold side of the heat exchange device, flows out from the hot side of the heat exchange device, flows into the first commutator from a switching port of the first commutator communicated with the fixed outlet, and flows into the next link from the fixed outlet.

After two-way exchange heat transfer system operation certain time, the scale deposit condition of hot side in the artifical heat transfer device that judges, when needing to clear up the scale deposit, switch first commutator and second commutator simultaneously, make the switching mouth of interchanger internal fixation entry switching intercommunication, fixed export also switches to another switching mouth of intercommunication, cold side and hot side in the heat transfer device are changed completely to this moment being equivalent to, sodium aluminate seminal fluid and seed precipitation mother liquor interchange circulation pipeline, utilize the characteristic that is alkaline of seed precipitation mother liquor, dissolve the scale deposit in the former hot side (the circulation pipeline of former sodium aluminate seminal fluid promptly), dredge the pipeline, and the heat exchange efficiency is improved.

The circulation pipeline of two kinds of liquid can be exchanged only need the commutator at simple switched systems both ends, utilize the liquid phase characteristic to clear up heat transfer system, on the one hand need not introduce any cleaning medium, guarantee the purity in the system, on the other hand need not park, the operation is simple, the clean up, do not produce pollution or other costs, the production efficiency is obviously improved, the heat transfer device efficiency, the heat exchanger life is prolonged, reduce artifical clearance maintenance number of times, reduce the running cost, the purchase reserve heat transfer device has been avoided, the investment is reduced, reequip is simple to current heat transfer system, and the popularization is easy.

Further preferably, the first commutator and the second commutator are two-way four-way valves, wherein the two switching ports are a first switching port and a second switching port respectively. The fixed inlet and the fixed outlet can be switched to be respectively communicated with the first switching port and the second switching port.

Preferably, the heat exchange device is a plate heat exchanger.

Preferably, a plurality of the heat exchange devices are arranged in series.

The number of the heat exchange devices is increased to improve the heat exchange effect, and two heat exchange devices are further preferred.

Preferably, the outlet pipeline of the semen pump is provided with a flow sensor and an electric regulating valve.

Preferably, a flow sensor and an electric regulating valve are arranged on an outlet pipeline of the seed precipitation mother liquid pump.

The flow velocity of two kinds of liquid of real time monitoring of being convenient for, control heat transfer effect, in time break-make guarantees heat exchange efficiency.

Preferably, the inlet and outlet pipelines of the heat exchange device are provided with pressure sensors and temperature sensors.

The state in the heat exchange device is monitored, so that the heat exchange effect can be conveniently determined, and the heat exchange efficiency can be further determined, and whether scabs or scales in the heat exchange device need to be cleaned or not can be identified.

Preferably, the inlet and outlet pipelines of the heat exchange device are provided with a Y-shaped slurry valve and a flat-bottom discharge valve.

The operation parameters of the heat exchange device are effectively controlled, and the heat exchange device is convenient to clean and overhaul.

Compared with the prior art, the utility model has the beneficial effects that: the whole system is simple in switching operation and convenient to clean, the cleaning process can continue the process flow, the operation is not interrupted, the production efficiency is improved, the labor intensity is reduced, and the labor and parking cost is further reduced; the heat exchange efficiency and the service life of the heat exchange system are improved, and the optimal operation state of the heat exchange equipment is kept; the structure is simple, the overhaul is convenient, the transformation is easy, the modification cost of the existing system is low, and the method is suitable for popularization and realization.

Drawings

FIG. 1 is a schematic diagram of a two-way exchange heat exchange system.

Fig. 2 is a schematic diagram of the internal structure of the first commutator and the second commutator.

Wherein, 1, a concentrate pump; 2. a first commutator; 3. a heat exchange device; 4. a second commutator; 5. a seed and mother liquor pump; 6. a fixed inlet; 7. a fixed outlet; 8. a first switching port; 9. a second switching port; 10. a flow sensor; 11. an electric control valve; 12. a pressure sensor; 13. a temperature sensor; 14. a Y-type slurry valve; 15. a flat bottom discharge valve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings 1-2.

Referring to the attached figures 1-2: a two-way exchange heat exchange system comprises a concentrate pump 1, a first commutator 2, a heat exchange device 3, a second commutator 4 and a seed separation mother liquor pump 5 which are connected in sequence.

The first commutator 2 and the second commutator 4 are two-way four-way valves, and the even fixed inlet 6, the fixed outlet 7, the first switching port 8 and the second switching port 9 of the first commutator 2 and the second commutator 4 are all connected; in an initial state, a fixed inlet 6 of the first commutator 2 is communicated with a first switching port 8, and a fixed outlet 7 is communicated with a second switching port 9; the fixed inlet 6 of the second commutator 9 is communicated with the second switching port 9, and the fixed outlet 7 is communicated with the first switching port 8.

The heat exchange device 3 is two plate heat exchangers which are connected in series, an inlet and an outlet at the same end of the heat exchange device 3 are respectively connected with two switching ports of the same commutator, the semen pump 1 is connected with the fixed inlet 6 of the first commutator 2, and the seed mother liquid pump 5 is connected with the fixed inlet 6 of the second commutator 4. The fixed outlet 7 of the first commutator 2 is connected with the downstream processing link of the seed precipitation mother liquor, and the fixed outlet 7 of the second commutator 4 is connected with the downstream processing link of the sodium aluminate seminal fluid.

And outlet pipelines of the concentrate pump 1 and the seed precipitation mother liquor pump 5 are provided with a flow sensor 10 and an electric regulating valve 11, and inlet and outlet pipelines of the heat exchange device 3 are provided with a Y-shaped slurry valve 14, a flat-bottom discharging valve 15, a pressure sensor 12 and a temperature sensor 13.

When the heat exchange is carried out between the sodium aluminate fine solution and the seed precipitation mother solution, the sodium aluminate fine solution firstly enters the first commutator 2 from the fixed inlet 6 of the first commutator 2 through the fine solution pump 1, is pumped out from the first switching port 8 of the first commutator, enters the hot side of the heat exchange device 3, flows out from the outlet of the hot side of the heat exchange device 3 after flowing through the hot sides of the two plate heat exchangers, flows into the second commutator 4 from the first switching port 8 of the second commutator 4, and flows into the downstream processing link of the sodium aluminate fine solution from the fixed outlet 7; meanwhile, the seed precipitation liquid firstly enters the second commutator 4 from the fixed inlet 6 of the second commutator 4 through the seed precipitation liquid pump 5, flows out from the second switching port 9, enters the cold side of the heat exchange device 3, flows out from the cold side outlet of the heat exchange device 3 after flowing through the cold sides of the two plate heat exchangers, enters the second commutator 2 from the second switching port 9 of the first commutator 2, and flows into the downstream processing link of the seed precipitation liquid from the fixed outlet 7.

Observe the temperature of the seed precipitation mother liquor that pressure sensor 12, temperature sensor 13, flow sensor 10 and electrical control valve 11 and fixed 7 departments of export flow out, sodium aluminate seminal fluid, judge the interior scale deposit condition of plate heat exchanger, heat exchange efficiency promptly, when heat exchange efficiency was low excessively, start the cleaning procedure: firstly, after residual materials in a nitrogen purging system are introduced into a cold side and a hot side simultaneously, the communication state of a two-way four-way valve is changed for both a first commutator 2 and a second commutator 4, at the moment, a fixed inlet 6 is communicated with a second switching port 9, and a fixed outlet 7 is communicated with a first switching port 8 in the first commutator 2; in the second commutator 4, the fixed inlet 6 communicates with the first switching port 8, and the fixed outlet 7 communicates with the second switching port 9.

And starting heat exchange again, operating the concentrate pump 1 and the seed precipitation mother liquor pump 5, and then completely exchanging the sodium aluminate concentrate with a pipeline through which the seed precipitation mother liquor flows, and dissolving and cleaning the scale on the path through which the sodium aluminate concentrate flows by utilizing the alkaline characteristic of the seed precipitation mother liquor.

During the operation, the Y-shaped slurry valve 14 and the flat-bottom discharge valve 15 can also be used for monitoring and controlling the flow in the process.

In a one-time maintenance period of six months, the whole bidirectional exchange heat exchange system has no heat exchange failure or blockage phenomenon.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. A two-way exchange heat exchange system is characterized in that: comprises a concentrate pump (1), a first commutator (2), a heat exchange device (3), a second commutator (4) and a seed mother liquor pump (5); the first commutator (2) and the second commutator (4) respectively comprise a fixed inlet (6), a fixed outlet (7) and two switching ports, the fixed inlet (6) is communicated with one switching port in a switchable manner, and the fixed outlet (7) is communicated with the other switching port in a switchable manner; the heat exchange device (3) is respectively connected with the switching ports of the first commutator (2) and the second commutator (4), the concentrate pump (1) is connected with the fixed inlet (6) of the first commutator (2), and the seed separation mother liquor pump (5) is connected with the fixed inlet (6) of the second commutator (4).

2. The two-way exchange heat exchange system of claim 1, wherein: the heat exchange device (3) is a plate heat exchanger.

3. The two-way exchange heat exchange system of claim 1, wherein: the heat exchange devices (3) are arranged in series.

4. The two-way exchange heat exchange system of claim 1, wherein: and a flow sensor (10) and an electric regulating valve (11) are arranged on an outlet pipeline of the concentrate pump (1).

5. The two-way exchange heat exchange system of claim 1, wherein: and an outlet pipeline of the mother liquor separating pump (5) is provided with a flow sensor (10) and an electric regulating valve (11).

6. The two-way exchange heat exchange system of claim 1, wherein: and a pressure sensor (12) and a temperature sensor (13) are arranged on an inlet pipeline and an outlet pipeline of the heat exchange device (3).

7. The two-way exchange heat exchange system of claim 1, wherein: and an inlet and outlet pipeline of the heat exchange device (3) is provided with a Y-shaped slurry valve (14) and a flat-bottom discharge valve (15).