CN110448927A - A kind of metabisulfite solution recirculating fluidized bed vaporising device and its operating method - Google Patents
A kind of metabisulfite solution recirculating fluidized bed vaporising device and its operating method Download PDFInfo
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- CN110448927A CN110448927A CN201910636666.9A CN201910636666A CN110448927A CN 110448927 A CN110448927 A CN 110448927A CN 201910636666 A CN201910636666 A CN 201910636666A CN 110448927 A CN110448927 A CN 110448927A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0094—Evaporating with forced circulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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Abstract
The invention belongs to vaporizer technology field, a kind of metabisulfite solution recirculating fluidized bed vaporising device and its operating method are disclosed, heating tube is vertically arranged and its lower end is entrance, upper end is outlet；The first connecting line of outlet of heating tube is connected with the entrance of vaporization chamber, the upper outlet of vaporization chamber is connected with condenser, the lower part outlet of vaporization chamber is connected with the entrance of circulation pipe, the outlet of circulation pipe is connected with the entrance of circulating pump, and the second connecting line of outlet of circulating pump is connected with the entrance of heating tube；Electromagnetic flowmeter is installed on circulation pipe and is connected with head tank and online particle throwing device, is connected with online particle collection device on the first connecting line；Online particle throwing device and online particle collection device are respectively used to be added and collect silicon-carbide particle.The present invention combines the evaporation process of fluidized bed heat exchanger antiscale power-saving technology and metabisulfite solution, easy to operate, effectively improves the heat transfer in metabisulfite solution evaporation process and anti-scaling property.
Description
Technical field
The invention belongs to vaporizer technology fields, specifically, be a kind of novel metabisulfite solution vaporising device and its
Operating method.
Background technique
Sodium sulphate is that the basic chemical industry raw material that one kind is important in industrial production is widely used in glass due to its price economy
Glass papermaking, is bleachinged and dyeing, feed, the industry such as washing.China's sodium sulphate yield is about 12,580,000 tons within 2017, accounts for worldwide production market
The 79.2% of share.However, not only heat transfer property is poor for the evaporation process of solution in the production process of sodium sulphate, but also
There is serious scale problems.The generation of dirt increases heat transfer resistance, and heat transfer property and the evaporation for reducing evaporator are strong
Degree, causes huge economic loss and energy waste, limits the industrial production of sodium sulphate.It is steamed at present for sodium sulphate production
Scale problems during hair, the method for mainly delaying fouling or the physics snaking that stops using flow velocity is increased.These methods are not
It can fundamentally solve the problems, such as fouling, can also reduce yield and product quality, increase operating cost.
Summary of the invention
The present invention is to solve the technical issues of heat transfer property is poor in metabisulfite solution evaporation process and easy fouling,
Provide a kind of metabisulfite solution recirculating fluidized bed vaporising device and its operating method, by fluidized bed heat exchanger antiscale power-saving technology and
The evaporation process of metabisulfite solution combines, easy to operate, effectively improve heat transfer in metabisulfite solution evaporation process and
Anti-scaling property.
In order to solve the above-mentioned technical problem, the present invention is achieved by technical solution below:
A kind of metabisulfite solution recirculating fluidized bed vaporising device, including heating tube, the heating tube are vertically arranged and under them
End is entrance, upper end is outlet；The first connecting line of outlet of the heating tube is connected with the entrance of vaporization chamber, the evaporation
The upper outlet of room is connected with condenser, and the lower part outlet of the vaporization chamber is connected with the entrance of circulation pipe, the circulation pipe
Outlet is connected with the entrance of circulating pump, and the second connecting line of outlet of the circulating pump is connected with the entrance of heating tube；It is described
Circulating pump is semi-open type centrifugal pump；
Electromagnetic flowmeter is installed, the circulation pipe is connected with head tank and online particle adds dress on the circulation pipe
It sets, is connected with online particle collection device on first connecting line.
Further, the online particle throwing device includes the first valve, inclined tube, the second valve, vertical pipe, third valve
Door and funnel；The circulation pipe is connect by first valve with the lower end of the vertical pipe, and the upper end of the vertical pipe is logical
It crosses the third valve to connect with the funnel, the vertical pipe lower part between first valve and the third valve connects
It is connected to the inclined tube, the second valve is provided on the inclined tube.
Further, the online particle collection device includes the 4th valve, particle collector, the 5th valve, the 6th valve
Door, cyclone hydraulic separators, the 7th valve, the 8th valve and the 9th valve；First connecting line by the 7th valve with
The entrance on the suspension separator top is connected, and passes through the liquid discharge of the 8th valve and the suspension separator top
Mouth is connected；The suspension separator lower part is connected by the 6th valve with the particle collector top, and described
Grain collector top is additionally provided with the 5th valve for emptying, and the particle collector lower part is provided with for discharge
The 4th valve of grain.
Further, the online particle throwing device is described online for silicon-carbide particle to be added into vaporising device
Particle collection device is used for by collecting silicon-carbide particle in vaporising device.
Further, the equivalent diameter of the silicon-carbide particle is 0.5~1mm.
Further, volume fraction of the silicon-carbide particle in mixed working fluid is 0.5%~2%.
Further, the heat flux of the heating tube is 6.47~11.22kWm-2。
Further, in the metabisulfite solution recirculating fluidized bed vaporising device solution rate of circulating flow be 0.38~
2.07m·s-1。
A kind of operating method of the metabisulfite solution recirculating fluidized bed vaporising device adds particle using described online
When device adds inert solid particle, first ensure that first valve, second valve are in close state, opens described the
Inert solid particle is added in the vertical pipe by three valves through funnel, is then shut off the third valve, opens described the
One valve makes inert solid particle enter the circulation pipe and enters in vaporising device with the feed liquid of flowing；Inert solid
After grain adds, the first valve is closed；Second valve is used for before adding inert solid particle every time, will be described vertical
The feed liquid retained in pipe is released by the inclined tube.
A kind of operating method of the metabisulfite solution recirculating fluidized bed vaporising device, utilizes the online powder collection
When device recycles inert solid particle, the 7th valve, the 8th valve are first opened, closes the 9th valve；At this point,
6th valve should be at open state, and the 4th valve, the 5th valve should be at closed state；Mixed working fluid stream
Through the cyclone hydraulic separators, inert solid particle enters the particle collector after centrifugal sedimentation, and feed liquid enters the evaporation
Room is separated and is participated in recycle；After inert solid particle is all collected in device to be evaporated, the 9th valve is opened, is closed
The 7th valve, the 8th valve are closed, vaporising device then continues normal operating；Later, the 6th valve is closed, is opened
5th valve emptying, then opens the 4th valve, the feed liquid and inert solid particle in the particle collector by
4th valve takes out.
The beneficial effects of the present invention are:
Fluidization is applied to sulphur by metabisulfite solution recirculating fluidized bed vaporising device of the invention and its operating method
In the evaporation process of acid sodium solution, silicon carbide solid particle is added in evaporator, forms three-phase circulating fluidized bed evaporation system
System, can efficiently solve the scale problems of metabisulfite solution evaporation process, while having good augmentation of heat transfer effect.It is former
Fluidisation because essentially consisting in silicon-carbide particle in evaporator destroys flowing and heat transfer boundary layer, enhances convective heat transfer；Meanwhile
The nucleus of boiling is increased, boiling heat transfer is enhanced.In addition, the fluidisation of particle further promotes mass transfer, near wall solution is reduced
Degree of supersaturation, extend the induction period of fouling.Therefore, the metabisulfite solution concentration range that the present invention is applicable in is wider, quality
Percentage concentration is generally in 5%~33.3% range.
Metabisulfite solution recirculating fluidized bed vaporising device of the invention and its operating method, not only device structure is simple, behaviour
Work is stablized, and energy consumption is small, is conducive to realize industrialization, and can effectively improve production efficiency and energy utilization rate, reduce environment
Pollution.The present invention solves metabisulfite solution vaporising device unsolved fouling problem for a long time, has broad application prospects, will
Generate huge economic benefit and environmental benefit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of metabisulfite solution recirculating fluidized bed vaporising device provided by the present invention；
In Fig. 1: 1, circulating pump；2, the second connecting line；3, heating tube；4, the first connecting line；5, online particle adds
Device；6, online particle collection device；7, electromagnetic flowmeter；8, circulation pipe；9, vaporization chamber；10, head tank；11, condenser.
Fig. 2 is the structural schematic diagram of online particle throwing device in Fig. 1；
In Fig. 2: a, the first valve；B, inclined tube；C, the second valve；D, vertical pipe；E, third valve；F, funnel；
Fig. 3 is the structural schematic diagram of online particle collection device in Fig. 1.
In Fig. 3: g, the 4th valve；H, particle collector；I, the 5th valve；J, the 6th valve；K, cyclone hydraulic separators；L,
Seven valves；M, the 8th valve；N, the 9th valve.
Specific embodiment
For that can further appreciate that summary of the invention of the invention, feature and effect, the following examples are hereby given, and cooperates attached drawing
Detailed description are as follows:
As shown in Figure 1, the device uses present embodiment discloses a kind of metabisulfite solution recirculating fluidized bed vaporising device
316L stainless steel is made, including circulating pump 1, the second connecting line 2, heating tube 3, the first connecting line 4, online particle add dress
Set 5, online particle collection device 6, electromagnetic flowmeter 7, circulation pipe 8, vaporization chamber 9, head tank 10 and condenser 11.
Heating tube 3 is vertically arranged, and the lower end of heating tube 3 is entrance, upper end is outlet, fluid along heating tube 3 to
Upper flowing.The first connecting line of outlet 4 of heating tube 3 is connected with the entrance of vaporization chamber 9, the upper outlet of vaporization chamber 9 with it is cold
Condenser 11 is connected, and the lower part outlet of vaporization chamber 9 is connected with the entrance of circulation pipe 8, the outlet of circulation pipe 8 and the entrance of circulating pump 1
It is connected, the second connecting line of outlet 2 of circulating pump 1 is connected with the entrance of heating tube 3.Wherein, circulating pump 1 select semi-open type from
Heart pump carries out forced circulation, and semi-open type centrifugal pump allows a small amount of impurity to pass through, and fluid may be implemented can be into without collecting particle
Row forced circulation simplifies the process flow of the vaporising device.Wherein, circulation pipe 8 includes vertical section interconnected and level
Section, vertical section are connected to the lower part outlet of vaporization chamber 9, and horizontal segment is connected to the entrance of circulating pump 1.
Head tank 10, online particle throwing device 5, electromagnetic flowmeter 7 are installed on circulation pipe 8.Head tank 10 connects
In in the vertical section of circulation pipe 8, close to the position of vaporization chamber 9；Head tank 10, can not parking online feed supplement for supplementing feed liquid.
Online particle throwing device 5 is connected on the horizontal segment of circulation pipe 8, close to the position of circulating pump 1；Online particle throwing device 5
Solid particle can be added online into metabisulfite solution recirculating fluidized bed vaporising device, it is convenient and efficient.
Online particle collection device 6 is mounted on the first connecting line 4, is connected to close to the position of vaporization chamber 9.Online
Grain collection device 6 is mainly made of cyclone hydraulic separators k and particle collector h, can be used for collecting metabisulfite solution circulation online
Solid particle in fluidized bed evaporation device.
As shown in Fig. 2, online particle throwing device 5 includes the first valve a, inclined tube b, the second valve c, vertical pipe d, third
Valve e and funnel f.The horizontal segment of circulation pipe 8 is connect by the first valve a with the lower end of vertical pipe d, and the upper end of vertical pipe d is logical
It crosses third valve e to connect with funnel f, the lower part vertical pipe d between the first valve a and third valve e is connected with inclined tube b, this is tiltedly
The second valve c, the feed liquid for being discharged in straight tube d are provided on pipe b.
As shown in figure 3, online particle collection device 6 is mainly made of cyclone hydraulic separators k and particle collector h, including the
Four valve g, particle collector h, the 5th valve i, the 6th valve j, cyclone hydraulic separators k, the 7th valve l, the 8th valve m and the 9th
Valve n.First connecting line 4 is connected by the 7th valve l with the entrance of suspension separator k upper left-hand, the first connecting tube
Road 4 is connected by the 8th valve m with the liquid outlet of suspension separator k upper right, and the lower part suspension separator k passes through the 6th
Valve j is connected with particle collector h, and the top particle collector h is provided with the 5th valve i for emptying, particle collector h
Lower part is provided with the 4th valve g for particle to be discharged.
A certain amount of silicon-carbide particle is added by adding particle device 5 online in the present invention, makes silicon-carbide particle and sulfuric acid
Sodium solution forms mixed working fluid, and recycles feed liquid and particle by circulating pump 1, and then plays augmentation of heat transfer and anti-, scale removal
Effect.In operating process, fluid is flowed up along heating tube 3, since silicon-carbide particle density is higher than fluid, moves upwards speed
Degree is lower than fluid, tends to move close to heating wall.Silicon-carbide particle density is larger, can be in heating tube 3 well
Fluidisation.Silicon carbide has that stable chemical performance, thermal coefficient are high, thermal expansion coefficient is small, wear-resisting property is good, hardness is big and density is big
Etc. characteristics；Its thermal coefficient is 83.6Wm-2·℃-1, it is approximately 142 times of bright sulfur acid sodium solution or so, therefore, silicon carbide
The mixed working fluid of grain and metabisulfite solution has and has higher thermal coefficient than bright sulfur acid sodium solution.In addition, silicon carbide density is big,
About 3180kgm-3, silicon-carbide particle, can be more during the motion to heat transfer wall with biggish collision and shear stress
Effectively destruction and thinned laminar sublayer, prevent attachment of the dirty core on wall surface, extend the induction period of fouling, and then improve evaporation
The augmentation of heat transfer and anti-scaling property of device.The metabisulfite solution concentration range that the present invention is applicable in is wider, mass percentage concentration one
As in 5%~33.3% range.The shape of silicon-carbide particle be irregular shape, equivalent diameter with select 0.5~1.0mm for
Good, to have biggish contact area with feed liquid, heat transfer is more preferable；Its volume fraction in mixed working fluid be 0.5%~
2.0%, granule density needed for can satisfy augmentation of heat transfer and anti-, scale removal in this way.The heat flux of heating tube 3 is in the present invention
6.47~11.22kWm-2, the rate of circulating flow of feed liquid is 0.38~2.07ms in device-1When, particle fluidizes and is divided in pipe
Cloth situation is preferable.
In operation, suitable feed liquid and silicon-carbide particle are added in system by the present invention, by using semi-open type from
Heart pump carries out forced circulation as circulating pump 1, and when fluid passes through heating tube 3, temperature is increased；After reaching boiling point, solution boils,
Vapor-liquid-solid three-phase flow is formed in system.When three-phase flow flows through vaporization chamber 9, vapour, liquid, solid three-phase are separated, and steam is by evaporating
Enter condenser 11 above room and be condensed into water, condensed water by artificially collect again through head tank 10 rejoin in system with
Maintain constant liquid level；Liquid, solid two-phase then enter circulation pipe 8 and participate in circulation.Electromagnetic flowmeter 7 inside circulation pipe 8 is for measuring
Flow through the flow of circulation pipe feed liquid.
When needing to add inert solid particle in system, inert solid particle is added using particle device 5 is added online, first
Ensure to add the first valve a on particle device 5 online, the second valve c is in close state, then open third valve e, will
A certain amount of inert solid particle is added in vertical pipe d through funnel f, is then shut off third valve e, slowly opens the first valve
A, solid particle then enter in the horizontal segment of circulation pipe 8, enter in vaporising device with the feed liquid of flowing.Solid particle has added
Bi Hou closes the first valve.Before adding particle every time, the first valve a is kept to close, opens the second valve c and third valve e,
The feed liquid retained in vertical pipe d is first released by inclined tube b, by 10 add-back system of head tank；Then the second valve c is turned off, is pressed
Particle is added according to abovementioned steps.
When needing replacing inert solid particle in system, inert solid particle is recycled using online particle collection device 6,
The 7th valve l, the 8th valve m on online particle collection device 6 are first opened, the 9th valve n is closed.At this point, the 6th valve j is answered
In the open state, the 4th valve g, the 5th valve i should be at closed state.Mixed working fluid flows through online particle collection device 6
Cyclone hydraulic separators k when, silicon-carbide particle enters particle collector h after centrifugal sedimentation, and feed liquid then enters vaporization chamber 9 and divided
It is recycled from participation.After device endoparticle to be evaporated is all collected, the 9th valve n is opened, closes the 7th valve l, the 8th valve
Door m, vaporising device then continue normal operating.At this point, closing the 6th valve j, the 5th valve i emptying is opened, then opens the 4th
Then reliable gravity takes out from the 4th valve g for feed liquid and silicon-carbide particle in valve g, particle collector h.
Under normal pressure, metabisulfite solution is evaporated using metabisulfite solution recirculating fluidized bed vaporising device of the invention, in carbon
Silicon carbide particle equivalent diameter is 0.5mm~1.0mm, and volume fraction is 0.5%~2.0%；The heat flux of heating tube 3 be 6.47~
11.22kW·m-2, the rate of circulating flow of feed liquid is 0.38~2.07ms-1When, which can play significant antiscale and reinforcing
Heat-transfer effect, heat transfer coefficient maximum can be improved 14.6%.As it can be seen that metabisulfite solution recirculating fluidized bed vaporising device of the invention has
There are apparent antiscale and augmentation of heat transfer effect, anti-, scale removal and enhanced heat transfer performance have emphatically for it for the addition of silicon-carbide particle
The influence wanted.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, may be used also
By make it is many in the form of specific transformation, within these are all belonged to the scope of protection of the present invention.
Claims (10)
1. a kind of metabisulfite solution recirculating fluidized bed vaporising device, including heating tube, which is characterized in that the heating tube is set vertically
It sets and its lower end is entrance, upper end is outlet；The first connecting line of outlet of the heating tube is connected with the entrance of vaporization chamber,
The upper outlet of the vaporization chamber is connected with condenser, and the lower part outlet of the vaporization chamber is connected with the entrance of circulation pipe, described
The outlet of circulation pipe is connected with the entrance of circulating pump, the second connecting line of outlet and the entrance phase of heating tube of the circulating pump
Even；The circulating pump is semi-open type centrifugal pump；
Electromagnetic flowmeter is installed, the circulation pipe is connected with head tank and online particle throwing device, institute on the circulation pipe
It states and is connected with online particle collection device on the first connecting line.
2. a kind of metabisulfite solution recirculating fluidized bed vaporising device according to claim 1, which is characterized in that described online
Particle throwing device includes the first valve, inclined tube, the second valve, vertical pipe, third valve and funnel；The circulation pipe passes through institute
It states the first valve to connect with the lower end of the vertical pipe, the upper end of the vertical pipe is connected by the third valve and the funnel
It connects, the vertical pipe lower part between first valve and the third valve is connected with the inclined tube, sets on the inclined tube
It is equipped with the second valve.
3. a kind of metabisulfite solution recirculating fluidized bed vaporising device according to claim 1, which is characterized in that described online
Particle collection device includes the 4th valve, particle collector, the 5th valve, the 6th valve, cyclone hydraulic separators, the 7th valve, the
Eight valves and the 9th valve；The entrance phase that first connecting line passes through the 7th valve and the suspension separator top
Connection, and be connected by the 8th valve with the liquid outlet on the suspension separator top；Under the suspension separator
Portion is connected by the 6th valve with the particle collector top, and the particle collector top is additionally provided with for arranging
Empty the 5th valve, the particle collector lower part is provided with the 4th valve for particle to be discharged.
4. a kind of metabisulfite solution recirculating fluidized bed vaporising device according to claim 1, which is characterized in that described online
Particle throwing device is used for for silicon-carbide particle, the online particle collection device to be added into vaporising device by vaporising device
Middle collection silicon-carbide particle.
5. a kind of metabisulfite solution recirculating fluidized bed vaporising device according to claim 4, which is characterized in that the carbonization
The equivalent diameter of silicon particle is 0.5~1mm.
6. a kind of metabisulfite solution recirculating fluidized bed vaporising device according to claim 4, which is characterized in that the carbonization
Volume fraction of the silicon particle in mixed working fluid is 0.5%~2%.
7. a kind of metabisulfite solution recirculating fluidized bed vaporising device according to claim 4, which is characterized in that the heating
The heat flux of pipe is 6.47~11.22kWm-2。
8. a kind of metabisulfite solution recirculating fluidized bed vaporising device according to claim 4, which is characterized in that the sulfuric acid
The rate of circulating flow of solution is 0.38~2.07ms in sodium solution recirculating fluidized bed vaporising device-1。
9. a kind of operating method of metabisulfite solution recirculating fluidized bed vaporising device as claimed in claim 2, which is characterized in that
Using it is described add particle device addition inert solid particle online when, first ensure first valve, at second valve
In closed state, the third valve is opened, inert solid particle is added in the vertical pipe through funnel, is then shut off institute
Third valve is stated, first valve is opened, inert solid particle is made to enter the circulation pipe and is entered with the feed liquid of flowing
In vaporising device；After inert solid particle adds, the first valve is closed；Second valve is used to add inertia every time
Before solid particle, the feed liquid retained in the vertical pipe is released by the inclined tube.
10. a kind of operating method of metabisulfite solution recirculating fluidized bed vaporising device as claimed in claim 3, feature exist
In first opening the 7th valve, the 8th valve when using the online particle collection device recycling inert solid particle
Door closes the 9th valve；At this point, the 6th valve should be at open state, the 4th valve, the 5th valve
It should be at closed state；Mixed working fluid flows through the cyclone hydraulic separators, and inert solid particle enters described after centrifugal sedimentation
Grain collector, feed liquid enter the vaporization chamber and are separated and participated in recycle；Inert solid particle whole quilt in device to be evaporated
After collection, the 9th valve is opened, closes the 7th valve, the 8th valve, vaporising device then continues normal operating；
Later, the 6th valve is closed, the 5th valve emptying is opened, then opens the 4th valve, the powder collection
Feed liquid and inert solid particle in device are taken out by the 4th valve.
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Application publication date: 20191115 |