CN216244316U - Stable-pressure percolate concentrated solution back-spraying system - Google Patents
Stable-pressure percolate concentrated solution back-spraying system Download PDFInfo
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Abstract
The utility model relates to a percolate concentrated solution back-spraying system with stable pressure, which sequentially comprises a water supply unit, a conveying unit and a back-spraying unit according to the flowing direction of a penetrating fluid; the output end of the water supply unit is connected with the input end of the conveying unit, and the water supply unit is used for providing penetrating fluid; the output end of the conveying unit is connected with the input end of the back spray unit, the conveying unit conveys penetrating fluid to the back spray unit, and the back spray unit is used for carrying out incineration treatment on the penetrating fluid; the conveying unit is provided with a backflow device, and the backflow device is used for adjusting the pressure in the system; the back spray unit is provided with a spray gun and a hearth, the spray gun sprays penetrating fluid to the hearth, and the hearth is used for evaporating the penetrating fluid. The utility model adopts the water supply unit, the conveying unit and the back spray unit, and can solve the problems of unstable system pressure, poor atomization effect, easy system blockage and the like in the furnace-entering back spray process.
Description
Technical Field
The utility model relates to the technical field of penetrating fluid, in particular to a percolate concentrated solution back-spraying system with stable pressure.
Background
The landfill leachate is different from common domestic sewage, the leachate has high BOD5 and COD concentration, high metal and ammonia nitrogen content, large water quality and water quantity change and imbalance of microorganism nutrient element proportion. The percolate is changed into percolate concentrated solution after being processed by a multi-stage membrane, is high-concentration organic wastewater, and has high chloride ion content.
The penetrating fluid is generally treated by a mode of entering the furnace and spraying back in the waste incineration power plant, but the problems of unstable system pressure, poor atomization effect, easy system blockage and the like exist in the conventional process of entering the furnace and spraying back, so that the concentrated penetrating fluid easily flows into furnace wall castable or bed materials, the waste is not flammable, and the temperature of the inner side of a hearth is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a percolate concentrated solution back-spraying system with stable pressure, which adopts a water supply unit, a conveying unit and a back-spraying unit and can solve the problems of unstable system pressure, poor atomization effect, easy system blockage and the like in a furnace back-spraying process.
In order to achieve the purpose, the utility model provides the following technical scheme:
a stable-pressure percolate concentrate back-spraying system sequentially comprises a water supply unit, a conveying unit and a back-spraying unit according to the flow direction of a percolate;
the output end of the water supply unit is connected with the input end of the conveying unit, and the water supply unit is used for providing penetrating fluid; the output end of the conveying unit is connected with the input end of the back spray unit, the conveying unit conveys penetrating fluid to the back spray unit, and the back spray unit is used for carrying out incineration treatment on the penetrating fluid;
the conveying unit is provided with a backflow device, and the backflow device is used for adjusting the pressure in the system;
the back spray unit is provided with a spray gun and a hearth, the spray gun sprays penetrating fluid to the hearth, and the hearth is used for evaporating the penetrating fluid.
Optionally, the water supply unit includes a first-stage filter and a permeate buffer tank, an input end of the first-stage filter is connected to an output end of the permeate pool, and an output end of the first-stage filter is connected to an input end of the permeate buffer tank.
Optionally, the delivery unit sequentially includes two secondary filters, a first branch, a second branch and a third branch according to the flow direction of the permeate;
the input ends of the two secondary filters are connected with the output end of the penetrating fluid cache tank, the two secondary filters form a parallel branch, and the two secondary filters are connected in parallel to form the input end of the conveying unit;
the output end of one of the two-stage filters is connected with the first branch, the output end of the other one of the two-stage filters is connected with the second branch, the third branch is respectively connected with the output ends of the two-stage filters, the third branch, the first branch and the second branch form a parallel branch, and the first branch, the second branch and the third branch are connected in parallel to form the output end of the conveying unit;
the first branch, the second branch and the third branch comprise Y-shaped filters and pressurizing pumps; the output end of the secondary filter is connected with the input end of the Y-shaped filter, the output end of the Y-shaped filter is connected with the input end of the pressure pump, and the output end of the pressure pump is connected with the input end of the reflux device and the input end of the back-spraying unit respectively.
Optionally, the first branch, the second branch and the third branch are all provided with an electric three-way valve, one input end of the electric three-way valve is connected with the output end of the secondary filter, the other input end of the electric three-way valve is connected with the output end of the industrial water, and the output end of the electric three-way valve is connected with the input end of the Y-type filter.
Optionally, the backflow device comprises a backflow pipeline and a backflow regulating valve;
the input end of the backflow pipeline is respectively connected with the output end of the first branch and the output end of the third branch, and the output end of the backflow pipeline is connected with the input end of the penetrating fluid cache tank;
the backflow regulating valve is installed at the input end of the backflow pipeline and used for regulating the flowing direction of penetrating fluid in the backflow pipeline.
Optionally, the back-spraying unit further comprises a spray gun regulating valve and a compressed air reducing valve;
the input end of the spray gun regulating valve is connected with the output end of the conveying unit, and the output end of the spray gun regulating valve is connected with the output end of the spray gun;
the input of compressed air relief pressure valve links to each other with the input of air, the output of compressed air relief pressure valve links to each other with the input of spray gun.
Optionally, an electromagnetic flowmeter and a pressure gauge are arranged between the pressure pump and the spray gun regulating valve;
the electromagnetic flowmeter is used for counting the flow in the pipeline, and the pressure gauge is used for measuring the pressure in the pipeline.
Optionally, the input end and the output end of the primary filter are both provided with pressure transmitters, and the input end and the output end of the secondary filter are both provided with pressure transmitters;
the pressure transmitter is used for measuring the pressure difference between the inlet and the outlet of the primary filter or the secondary filter.
Optionally, the number of the back-spraying units is two, wherein the input end of one of the back-spraying units is connected with the output end of the first branch, and the input end of the other back-spraying unit is connected with the output end of the third branch.
Optionally, two spray guns are arranged on two sides of the hearth, and a pressure gauge and a spray gun regulating valve are arranged at the input ends of the spray guns.
Compared with the prior art, the embodiment of the utility model has the following beneficial effects:
1. the water supply unit provides penetrating fluid needing to be processed for the conveying unit, and the conveying unit conveys the penetrating fluid to the back spraying unit, and the back spraying unit is provided with a spray gun and a hearth. The spray gun can disperse penetrating fluid into tiny liquid drops, and then spray in the furnace, and the furnace can heat for penetrating fluid is even evaporation in the furnace, has both guaranteed the burning operating mode in the furnace, can also humidity cooling, reduces the harm of overheated flue gas to the furnace, and the condition that reduces the coking produces. When the water supply unit continuously provides penetrating fluid for the conveying unit, so that the penetrating fluid in the system is excessive, and the pressure is excessive, the backflow device can timely adjust the pressure in the system, reduce the situation of poor atomization effect of the spray gun caused by stable pressure in the system, and solve the problems of unstable system pressure and poor atomization effect of the conventional furnace-entering back-spraying process;
2. according to the permeate concentrate back-spraying system, each back-spraying unit is connected with one conveying unit, the two back-spraying units are mutually independent, and when one back-spraying unit breaks down, the operation of the whole permeate concentrate back-spraying system cannot be influenced.
Drawings
FIG. 1 is a schematic diagram of the overall configuration of a pressure stabilized permeate concentrate recirculation system in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of a water supply unit in a pressure stabilized permeate concentrate back-spray system in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of a delivery unit in a pressure stabilized permeate concentrate recirculation system in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram of a backwash unit in a pressure stabilized permeate concentrate backwash system in accordance with one embodiment of the utility model;
wherein, 1, a water supply unit; 10. a pressure transmitter; 11. a first stage filter; 12. a permeate buffer tank; 2. a conveying unit; 201. a first branch; 202. a second branch circuit; 203. a third branch; 21. a secondary filter; 22. an electric three-way valve; 23. a Y-type filter; 24. a pressure pump; 25. a return line; 26. a reflux regulating valve; 3. a back spray unit; 31. an electromagnetic flow meter; 32. a pressure gauge; 33. a spray gun regulating valve; 34. a spray gun; 35. a hearth; 36. a compressed air pressure reducing valve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A pressure stabilized permeate concentrate recirculation system in accordance with an embodiment of the present invention is described below with reference to FIGS. 1-4.
Referring to fig. 1, a pressure stabilized permeate concentrate back-spray system sequentially comprises a water supply unit 1, a delivery unit 2 and a back-spray unit 3 according to the flow direction of permeate, wherein the output end of the water supply unit 1 is connected with the input end of the delivery unit 2, and the water supply unit 1 is used for providing permeate; the output end of the conveying unit 2 is connected with the input end of the back spray unit 3, the conveying unit 2 conveys penetrating fluid to the back spray unit 3, and the back spray unit 3 is used for burning the penetrating fluid; the conveying unit 2 is provided with a backflow device which is used for adjusting the pressure in the system; the back spray unit 3 is provided with a spray gun 34 and a hearth 35, the spray gun 34 sprays penetrating fluid to the hearth 35, and the hearth 35 is used for evaporating the penetrating fluid.
In the pressure-stabilized percolate concentrated solution back-spraying system, a water supply unit 1 supplies permeate liquid needing to be treated to a conveying unit 2, the conveying unit 2 conveys the permeate liquid to a back-spraying unit 3, and a spray gun 34 and a hearth 35 are arranged in the back-spraying unit 3. The penetrating fluid can be dispersed into tiny liquid drops by the spray gun 34 and then uniformly sprayed into the hearth 35, and the hearth 35 can be heated, so that the penetrating fluid is uniformly evaporated in the hearth 35, thereby ensuring the combustion condition in the hearth 35, properly cooling the hearth 35, reducing the damage of the overheated smoke gas to the hearth 35, and reducing the generation of coking.
When the water supply unit 1 continuously provides penetrating fluid for the conveying unit 2, so that the penetrating fluid in the system is too much, and the pressure is too high, the backflow device can timely adjust the pressure in the system, the situation that the atomization effect of the spray gun 34 is poor due to the stable pressure in the system is reduced, and the problems that the system pressure is unstable and the atomization effect is poor in the existing furnace-entering back-spraying process are solved.
Referring to fig. 2, the water supply unit 1 includes a primary filter 11 and a permeate buffer tank 12, wherein an input end of the primary filter 11 is connected to an output end of the permeate pool, and an output end of the primary filter 11 is connected to an input end of the permeate buffer tank 12.
The penetrating fluid firstly enters the first-stage filter 11 for filtering, and the first-stage filter 11 can isolate large-particle impurities in the penetrating fluid, so that the situation that the impurities are accumulated in a system pipeline to cause unstable system pressure and the system pipeline is blocked is reduced.
The penetrating fluid buffer tank 12 can collect the penetrating fluid output from the first-stage filter 11 and then output the penetrating fluid to the conveying unit 2 in a unified way, so that the penetrating fluid buffer tank 12 can output the penetrating fluid with the same flow rate every time, and the condition that the pressure of a system pipeline is unstable is reduced.
With reference to fig. 3, the delivery unit 2 comprises, in sequence, two secondary filters 21, a first branch 201, a second branch 202 and a third branch 203, according to the direction of flow of the permeate; the input ends of the two secondary filters 21 are connected with the output end of the penetrating fluid cache tank 12, the two secondary filters 21 form a parallel branch, and the two secondary filters 21 are connected in parallel to form the input end of the conveying unit 2.
The output end of one of the secondary filters 21 is connected to the first branch 201, the output end of the other secondary filter 21 is connected to the second branch 202, the third branch 203 is respectively connected to the output ends of the two secondary filters 21, the third branch 203 and the first branch 201 and the second branch 202 form a parallel branch, and the first branch 201, the second branch 202 and the third branch 203 are connected in parallel to form the output end of the conveying unit 2.
The first branch 201, the second branch 202 and the third branch 203 each comprise a Y-filter 23 and a booster pump 24; the output end of the secondary filter 21 is connected with the input end of the Y-shaped filter 23, the output end of the Y-shaped filter 23 is connected with the input end of the pressure pump 24, and the output end of the pressure pump 24 is respectively connected with the input end of the reflux device and the input end of the back-spraying unit 3.
The secondary filter 21 can continue to filter the osmotic pressure, remove small particle impurities in the osmotic fluid, reduce the situation that impurities in the osmotic fluid block the inlet of the booster pump 24, and avoid the unstable pressure of the system pipeline caused by the output problem of the booster pump 24. The Y-shaped filter 23 can further filter a small amount of solid particles in the penetrating fluid, further reduce the blockage of the booster pump 24 by small particle impurities and reduce the unstable pressure of the system pipeline.
It is worth mentioning that, because the solid particle impurities exist in the permeate, the pressure transmitter 10 is disposed at the front and the rear of the first-stage filter 11 and the second-stage filter 21, and the pressure transmitter 10 can measure the pressure difference of the permeate passing through the first-stage filter 11 and the second-stage filter 21, so as to determine the accumulation condition of the solid particles in the first-stage filter 11 and the second-stage filter 21. When the front and back pressure difference of the primary filter 11 or the secondary filter 21 is large, the working personnel can replace and clean the primary filter 11 or the secondary filter 21 in time, so that the pressure in the system pipeline can be kept stable.
When the liquid level in the permeate buffer tank 12 reaches a low value, the permeate is less transported outwards, the pressure in the system pipeline is easily influenced, and the pressure in the system pipeline can be increased by starting the booster pump 24, so that the pressure in the system pipeline is kept constant.
The scheme is provided with the first branch 201, the second branch 202 and the third branch 203, so that a large amount of penetrating fluid can be treated in the same time period, and the treating effect of the penetrating fluid is improved.
It should be noted that the first branch 201, the second branch 202 and the third branch 203 are all provided with an electric three-way valve 22, one input end of the electric three-way valve 22 is connected with the output end of the secondary filter 21, the other input end of the electric three-way valve 22 is connected with the output end of the industrial water, and the output end of the electric three-way valve 22 is connected with the input end of the Y-shaped filter 23.
When the liquid level of penetrating fluid in the concentrated solution buffer tank reaches a low value, the input end of the electric three-way valve 22 is automatically switched to the industrial water side, and at the moment, industrial water is conveyed into a system pipeline by the electric three-way valve 22, so that the problem of unstable pipeline pressure caused by low liquid level of the penetrating fluid in the system pipeline can be prevented; after the industrial water is pressurized by the pressurizing pump 24, the system pipeline can be flushed, so that the condition that the osmotic pressure in the system pipeline is reduced to reduce the flow area in the system pipeline caused by salt deposition, and the system pressure is influenced occurs.
Further, the reflux device includes a reflux pipe 25 and a reflux adjustment valve 26; the input end of the backflow pipeline 25 is connected to the output end of the first branch 201 and the output end of the third branch 203, respectively, and the output end of the backflow pipeline 25 is connected to the input end of the permeate buffer tank 12; the backflow regulating valve 26 is installed at an input end of the backflow pipeline 25, and the backflow regulating valve 26 is used for regulating the flow direction of the penetrating fluid in the backflow pipeline 25.
Because the electric three-way valve 22 can automatically switch the input end to convey the industrial water into the system pipeline, the liquid in the system pipeline is more at the moment, and the pipeline pressure can be higher. When the pressure in the system pipe reaches a predetermined value, the liquid in the system pipe can flow through the backflow regulating valve 26, on the backflow pipe 25, and then flow into the penetrating fluid buffer tank 12 again, so that the pressure in the system pipe can be reduced, and the pressure in the system pipe is ensured to be in a stable state.
It should be noted that, the industrial water is delivered to the permeate buffer tank 12 by the return line 25, which can reduce the concentration of some insoluble inorganic salts in the system pipeline, reduce the salt deposition of the insoluble inorganic salts in the system pipeline, so that the permeate can smoothly flow in the system pipeline and is delivered to the back spray unit 3 for combustion and evaporation.
Referring to fig. 4, the back spray unit 3 sequentially includes an electromagnetic flow meter 31, a pressure gauge 32, a spray gun regulating valve 33 and a compressed air pressure reducing valve 36 according to the flow direction of the permeate; the input end of the spray gun regulating valve 33 is connected with the output end of the conveying unit 2, and the output end of the spray gun regulating valve 33 is connected with the output end of the spray gun 34.
The input end of the compressed air reducing valve 36 is connected with the input end of air, and the output end of the compressed air reducing valve 36 is connected with the input end of the spray gun 34.
The pressure gauge 32 can constantly monitor the pressure in the system pipeline, and a worker can adjust the flow rate of the spray gun regulating valve 33 through pressure feedback of the pressure gauge 32, so that the pressure in the system pipeline can be kept stable; the electromagnetic flowmeter 31 can count instantaneous flow and accumulated flow, reflect the condition of pipeline blockage from the side, and work personnel can dredge the pipeline in time, thereby reducing the condition of pipeline blockage.
The input end of the spray gun 34 is provided with a spray gun regulating valve 33, and the spray gun regulating valve 33 can further regulate the flow and pressure of the penetrating fluid in the pipeline, so that the pressure of the spray gun 34 is stable, the penetrating fluid can be dispersed into a plurality of tiny liquid drops, the penetrating fluid can be uniformly sprayed in the hearth 35, and the combustion and the evaporation are carried out in the hearth 35.
The compressed air pressure reducing valve 36 can keep the working pressure inside the spray gun 34 low, and the penetrating fluid generally flows through the air nozzle of the spray gun 34 at a high flow rate with the working pressure of compressed air of 0.3Mpa-0.6Mpa, so that a partial vacuum is formed around the nozzle, the penetrating fluid is sucked into the vacuum space by the compressed air, and the penetrating fluid is atomized into fine fog drops and uniformly sprayed into the hearth 35.
It should be noted that the number of the back-spraying units 3 is two, wherein the input end of one of the back-spraying units 3 is connected to the output end of the first branch, and the input end of the other back-spraying unit 3 is connected to the output end of the third branch.
Two back-spraying units 3 are arranged, so that the percolate concentrated solution back-spraying system with stable pressure can simultaneously treat a large amount of penetrating fluid, and the treatment efficiency of the penetrating fluid is improved. In the permeate concentrate back-spraying system, each back-spraying unit 3 is connected with one conveying unit 2, the two back-spraying units 3 are independent from each other, and when one back-spraying unit 3 fails, the operation of the whole permeate concentrate back-spraying system cannot be influenced.
Two spray guns 34 are arranged on two sides of the hearth 35, each spray gun 34 is provided with an independent pressure gauge 32 and a spray gun regulating valve 33, the pressure gauge 32 can constantly monitor the pressure of the branch pipeline, and the spray gun regulating valve 33 is adjusted through pressure feedback of the branch pipeline, so that the atomization effect of the spray guns 34 is ensured, and penetrating fluid can be uniformly sprayed into the hearth 35. And when one of the spray guns 34 fails, the operation of the other spray guns 34 is not affected.
Other configurations and operations of a pressure stabilized permeate concentrate back-spray system according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A pressure-stabilized percolate concentrate back-spraying system is characterized by sequentially comprising a water supply unit, a conveying unit and a back-spraying unit according to the circulation direction of a percolate;
the output end of the water supply unit is connected with the input end of the conveying unit, and the water supply unit is used for providing penetrating fluid; the output end of the conveying unit is connected with the input end of the back spray unit, the conveying unit conveys penetrating fluid to the back spray unit, and the back spray unit is used for carrying out incineration treatment on the penetrating fluid;
the conveying unit is provided with a backflow device, and the backflow device is used for adjusting the pressure in the system;
the back spray unit is provided with a spray gun and a hearth, the spray gun sprays penetrating fluid to the hearth, and the hearth is used for evaporating the penetrating fluid.
2. A pressure stabilized permeate concentrate back flush system according to claim 1 wherein said water supply unit comprises a primary filter and a permeate buffer tank, said primary filter having an input connected to an output of said permeate reservoir and said primary filter having an output connected to an input of said permeate buffer tank.
3. The system of claim 2 wherein the feed unit comprises two secondary filters, a first branch, a second branch and a third branch in sequence, depending on the direction of permeate flow;
the input ends of the two secondary filters are connected with the output end of the penetrating fluid cache tank, the two secondary filters form a parallel branch, and the two secondary filters are connected in parallel to form the input end of the conveying unit;
the output end of one of the two-stage filters is connected with the first branch, the output end of the other one of the two-stage filters is connected with the second branch, the third branch is respectively connected with the output ends of the two-stage filters, the third branch, the first branch and the second branch form a parallel branch, and the first branch, the second branch and the third branch are connected in parallel to form the output end of the conveying unit;
the first branch, the second branch and the third branch comprise Y-shaped filters and pressurizing pumps; the output end of the secondary filter is connected with the input end of the Y-shaped filter, the output end of the Y-shaped filter is connected with the input end of the pressure pump, and the output end of the pressure pump is connected with the input end of the reflux device and the input end of the back-spraying unit respectively.
4. The system of claim 3 wherein the first, second and third branches each include an electrically operated three-way valve having one input connected to the output of the secondary filter, another input connected to the industrial water output, and an output connected to the input of the Y-filter.
5. A pressure stabilised permeate concentrate recirculation system according to claim 3 wherein the recirculation means comprises a recirculation line and a recirculation control valve;
the input end of the backflow pipeline is respectively connected with the output end of the first branch and the output end of the third branch, and the output end of the backflow pipeline is connected with the input end of the penetrating fluid cache tank;
the backflow regulating valve is installed at the input end of the backflow pipeline and used for regulating the flowing direction of penetrating fluid in the backflow pipeline.
6. A pressure stabilised permeate concentrate backspray system according to claim 3 wherein the backspray unit further comprises a lance adjustment valve and a compressed air relief valve;
the input end of the spray gun regulating valve is connected with the output end of the conveying unit, and the output end of the spray gun regulating valve is connected with the output end of the spray gun;
the input of compressed air relief pressure valve links to each other with the input of air, the output of compressed air relief pressure valve links to each other with the input of spray gun.
7. The system of claim 6 wherein an electromagnetic flow meter and pressure gauge are provided between the booster pump and the lance regulator valve;
the electromagnetic flowmeter is used for counting the flow in the pipeline, and the pressure gauge is used for measuring the pressure in the pipeline.
8. A pressure stabilised permeate concentrate recirculation system according to claim 3 wherein the primary filter is fitted with a pressure transducer at both its input and output and the secondary filter is fitted with a pressure transducer at both its input and output;
the pressure transmitter is used for measuring the pressure difference between the inlet and the outlet of the primary filter or the secondary filter.
9. A pressure stabilised permeate concentrate recirculation system according to claim 3 wherein the number of said recirculation units is two, wherein the input of one of said recirculation units is connected to the output of said first branch and the input of the other of said recirculation units is connected to the output of said third branch.
10. A pressure stabilised permeate concentrate recirculation system according to claim 7 wherein two lances are provided on either side of the hearth, the lances having pressure gauges and lance control valves at their inputs.
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