CN216203279U - Demineralized water tank and dry quenching system - Google Patents

Abstract

The utility model provides a demineralized water tank and a dry quenching system, wherein the demineralized water tank comprises: the box body is provided with an accommodating cavity for accommodating desalted water, the top of the box body is provided with a water inlet and an air outlet which are communicated with the accommodating cavity, the bottom of the box body is provided with a water outlet which is communicated with the accommodating cavity, the air outlet is communicated with the atmosphere, and the water outlet is communicated with the deoxygenation water-feeding pump; the isolation structure is arranged in the accommodating cavity, can float up and down along with the lifting of the liquid level of the demineralized water and is used for isolating the demineralized water from air in the accommodating cavity; the inlet tube, first end is connected in the water inlet, and the second end passes isolation structure and stretches into below the liquid level of demineralized water, and the mouth of pipe of the second end of inlet tube is close to the delivery port, makes the demineralized water that lets in by the inlet tube directly reach near delivery port in order in time to be siphoned away by the deoxidization feed pump, and then reduces the contact of demineralized water and oxygen in the atmosphere, is favorable to reducing the load of follow-up oxygen-eliminating device, saves supplementary deoxidization dosage for deaerator.

Description

Demineralized water tank and dry quenching system

Technical Field

The utility model relates to the technical field of dry quenching process equipment, in particular to a demineralized water tank and a dry quenching system.

Background

In a dry quenching system, a demineralized water tank is typically provided to store demineralized water, the source of which typically includes condensate returned by the condenser of the steam turbine and other water that may be recovered. The above-mentioned demineralized water tank generally adopts an open type tank, i.e. the top of the demineralized water tank is equipped with an exhaust port, and the interior of the demineralized water tank can be communicated with atmosphere through the exhaust port.

Still include the oxygen-eliminating device among the dry coke quenching system generally, oxygen-eliminating device and demineralized water tank intercommunication to be equipped with the deoxidization feed pump between the two, can carry out the deoxidization in sending the oxygen-eliminating device with the demineralized water pump in the demineralized water tank through the deoxidization feed pump, the demineralized water after the deoxidization gets into the boiler as boiler feed water. If the oxygen-eliminating device adopts the atmospheric oxygen-eliminating device, the water quality requirement to the boiler feedwater under the high temperature high pressure condition can't be satisfied to its deoxidization effect, consequently need set up supplementary deoxidization device in order to assist the deoxidization through the medicament in the low reaches of oxygen-eliminating device to guarantee that boiler feedwater quality of water is up to standard.

Because the condenser of the steam turbine has a certain deoxidization effect on the condensed water, the oxygen content of the part of the condensed water is lower. However, because the demineralized water tank is communicated with the atmosphere through the exhaust port, after the condensed water is sprayed into the demineralized water tank, because the condensed water is in direct contact with the atmosphere, oxygen in the air can be dissolved into the condensed water, so that the oxygen content in the condensed water is increased, and the load of a subsequent deaerator and the amount of the medicament consumed by the auxiliary deaerating device can be increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to at least solve one of the technical problems in the prior art and provides a demineralized water tank and a dry quenching system.

In a first aspect, the present invention provides a demineralized water tank for storing demineralized water and pumping the demineralized water to a deaerator by a deaerating feed pump, the demineralized water tank comprising: the box body is provided with an accommodating cavity for accommodating desalted water, the top of the box body is provided with a water inlet and an air outlet which are communicated with the accommodating cavity, the bottom of the box body is provided with a water outlet which is communicated with the accommodating cavity, the air outlet is communicated with the atmosphere, and the water outlet is communicated with the deoxygenation water-feeding pump; the isolation structure is arranged in the accommodating cavity, can float up and down along with the lifting of the liquid level of the demineralized water and is used for isolating the demineralized water from air in the accommodating cavity; the inlet tube, the first end of inlet tube is connected in the water inlet, and the second end of inlet tube passes isolation structure and stretches into below the liquid level of demineralized water, and the mouth of pipe of the second end of inlet tube is close to the delivery port, makes the demineralized water that lets in by the inlet tube directly reach near delivery port in order in time to be siphoned away by the deoxidization feed pump.

Furthermore, the pipe orifice of the second end of the water inlet pipe and the water outlet are positioned on the same horizontal plane; and/or a preset distance is reserved between the pipe orifice of the second end of the water inlet pipe and a vertical plane where the water outlet is located and passing through the center of the accommodating cavity, wherein the ratio of the preset distance to the inner diameter of the accommodating cavity is less than or equal to 1/4.

Furthermore, the isolation structure is hermetically connected with the water inlet pipe, and the isolation structure is hermetically connected with the cavity wall of the accommodating cavity.

Further, isolation structure includes a plurality of floaters, and after a plurality of floaters were placed at the holding intracavity, each floater can float on the liquid level of demineralized water, and the mutual contact is in order to form the isolation layer between a plurality of floaters.

Furthermore, the bottom of the box body is provided with a sewage draining outlet communicated with the accommodating cavity, and the water outlet is higher than the horizontal plane where the sewage draining outlet is located.

Further, still include the level gauge, the first end of level gauge is fixed in isolating structure's top, and the second end of level gauge passes isolating structure and stretches into below the liquid level of demineralized water, is equipped with the overflow mouth on the lateral wall of box, and the overflow mouth is higher than the first end place horizontal plane of level gauge, and perhaps, the overflow mouth is in on the same horizontal plane with the first end of level gauge.

Furthermore, the top of the box body is provided with a light-transmitting part which can be selectively opened or closed, and when the light-transmitting part is opened, external light enters the accommodating cavity from the light-transmitting part.

Furthermore, the top of the box body is provided with an exhaust pipe, the exhaust pipe comprises a straight pipe section and a bent pipe section, two ends of the straight pipe section are respectively connected with the box body and the bent pipe section, the bent pipe section is bent downwards, and an opening of the bent pipe section, which is far away from one end of the straight pipe section, forms an exhaust port.

In a second aspect, the utility model further provides a dry quenching system, which comprises a desalted water tank, a deoxygenation water feed pump, a deoxygenator, a boiler water feed pump and a boiler, which are sequentially communicated, wherein the desalted water in the desalted water tank is pumped into the deoxygenator through the deoxygenation water feed pump to be deoxygenated, and the deoxygenated desalted water is pumped into the boiler through the boiler water feed pump after being deoxygenated, wherein the desalted water tank is the desalted water tank.

Further, the system also comprises a steam turbine and a condenser, wherein the steam turbine and the condenser are sequentially communicated between the boiler and the demineralized water tank, the demineralized water after being deoxidized exchanges heat in the boiler to form steam, and the steam sequentially passes through the steam turbine and the condenser to form condensate water and returns to the demineralized water tank.

The utility model has the following beneficial effects:

the utility model provides a demineralized water tank which comprises a tank body, an isolation structure and a water inlet pipe, wherein the tank body is provided with an accommodating cavity, the top of the tank body is provided with a water inlet and an air outlet which are communicated with the accommodating cavity, the bottom of the tank body is provided with a water outlet which is communicated with the accommodating cavity, the air outlet is communicated with the atmosphere, the water outlet is communicated with a deoxygenation water feeding pump, and the demineralized water in the accommodating cavity can be sucked away from the water outlet and pumped into a deoxygenation device under the action of the deoxygenation water feeding pump.

The isolation structure is arranged in the accommodating cavity. The isolation structure can float on the surface of the demineralized water and can float up and down along with the lifting of the surface of the demineralized water. Isolation structure mainly used keeps apart the air of demineralized water and holding intracavity, can avoid the atmosphere to cause the pollution to demineralized water on the one hand, and on the other hand can reduce demineralized water and atmospheric area of contact in order to reduce the influence of atmosphere to demineralized water oxygen content to be favorable to improving boiler feedwater quality, guarantee the safe operation of boiler.

The first end of the water inlet pipe is connected and communicated with the water inlet, and the second end of the water inlet pipe penetrates through the isolation structure and stretches into the position below the liquid level of the demineralized water. Simultaneously, the mouth of pipe of the second end of inlet tube is close to the delivery port to the messenger directly reaches near delivery port by the demineralized water that the inlet tube lets in order in time to be siphoned away by the deoxidization feed pump, and then reduces the contact of demineralized water with oxygen in the atmosphere as far as possible, reduces oxygen content in the demineralized water, is favorable to reducing the load of follow-up oxygen-eliminating device, saves supplementary deoxidization dosage for the deaerator, improves the boiler quality of supplying water.

Drawings

FIG. 1 is a schematic view of a structure of a demineralized water tank according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the demineralized water tank of FIG. 1;

fig. 3 is a schematic diagram of a configuration of a dry quenching system according to one embodiment of the utility model.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the brine tank and the dry quenching system provided by the present invention will be described in detail below with reference to the accompanying drawings.

It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.

As shown in fig. 3, the present invention provides a demineralized water tank 100 for storing demineralized water, which is mainly used for recovering water such as condensed water returned from a condenser 800 of a steam turbine 700, additional demineralized water according to the requirement of a dry quenching system, and the like. The above-described demineralized water tank 100 may be deoxygenated by pumping demineralized water into a deoxygenator 300 by a deoxygenated feed pump 200. If the oxygen content in the desalted water after being deoxidized by the deaerator 300 can not meet the water quality requirement of boiler feed water, the deaerator needs to be assisted by medicaments in the auxiliary deaerator 400. Finally, the deoxygenated, demineralized water is fed into the boiler 600 as boiler feed water for subsequent operations.

As shown in fig. 1 and 2, in some embodiments, the demineralized water tank 100 includes a tank body 10, the tank body 10 having a receiving chamber 11 for receiving demineralized water, a top of the tank body 10 being provided with an inlet 12 and an outlet 13 communicating with the receiving chamber 11, and a bottom of the tank body 10 being provided with an outlet 14 communicating with the receiving chamber 11. The exhaust port 13 is connected to the atmosphere, and the accommodating chamber 11 is connected to the atmosphere through the exhaust port 13 (i.e., the demineralized water tank 100 is an open type demineralized water tank). The water inlet 12 may be in communication with the condenser 800, other devices capable of being recovered by the demineralized water tank 100, and devices for replenishing water. The water outlet 14 is communicated with the deoxygenation water-feeding pump 200, and the deoxygenation water-feeding pump 200 can suck the demineralized water in the accommodating cavity 11 away from the water outlet 14 to pump the demineralized water into the deoxygenator 300.

The demineralized water tank 100 further includes an isolation structure 20, the isolation structure 20 being disposed in the receiving chamber 11. The isolation structure 20 may float above the surface of the demineralized water and may float up and down as the surface of the demineralized water rises and falls. Isolation structure 20 mainly used keeps apart the air in demineralized water and the holding chamber 11, can avoid the atmosphere to cause the pollution to demineralized water on the one hand, and on the other hand can reduce demineralized water and atmospheric area of contact in order to reduce the influence of atmosphere to demineralized water oxygen content to be favorable to improving boiler feedwater quality, guarantee boiler 600's safe operation.

The demineralized water tank 100 further includes an inlet tube 30, a first end of the inlet tube 30 being connected to and in communication with the inlet port 12, and a second end of the inlet tube 30 passing through the isolation structure 20 and extending below the surface of the demineralized water. Simultaneously, the mouth of pipe of the second end of inlet tube 30 is close to delivery port 14 to the messenger directly reaches near delivery port 14 by the demineralized water that inlet tube 30 let in and in time siphons away with can being siphoned away by deoxidization feed pump 200, and then reduces the contact of demineralized water with oxygen in the atmosphere as far as possible, reduces the oxygen content in the demineralized water, is favorable to reducing the load of follow-up oxygen-eliminating device 300, saves supplementary deoxidization of deaerator 400 dosage, improves boiler feed water quality. It should be noted that, in other embodiments, the auxiliary deaerator 400 may not be provided, and only the deaerator 300 may be used to deaerate the demineralized water, and at this time, the above-mentioned arrangement still can play a role in reducing the load of the subsequent deaerator 300 and improving the quality of the boiler feed water.

It should be noted that fig. 2 shows a vertical plane a where the water outlet 14 is located and passing through the center of the accommodating chamber 11, and a vertical plane B (perpendicular to the opening direction of the water outlet 14) perpendicular to the vertical plane a divides the accommodating chamber 11 into two areas. By "the orifice of the second end of the inlet conduit 30 is close to the outlet 14" it is understood that the orifice of the second end of the inlet conduit 30 is located in the containing chamber 11 in the same area as the outlet 14, which is separated by the vertical plane B.

It should be noted that the specific distance between the nozzle of the second end of the water inlet pipe 30 and the vertical plane B is not limited, for example, the ratio of the distance between the nozzle of the second end of the water inlet pipe 30 and the vertical plane B to the inner diameter of the accommodating chamber 11 may be greater than 1/4, and the larger the distance between the nozzle of the second end of the water inlet pipe 30 and the vertical plane B, the closer the nozzle of the second end of the water inlet pipe 30 is to the water outlet 14.

As shown in fig. 1 and 2, in some embodiments, the orifice of the second end of the inlet conduit 30 is substantially in the same horizontal plane as the outlet 14. Herein, "substantially in the same horizontal plane" is understood to mean that the nozzle at the second end of the inlet conduit 30 is located in a plane that is flush with the center of the outlet port 14, any position between the top edge of the outlet port 14 and the center thereof, or any position between the bottom edge of the outlet port 14 and the center thereof. This arrangement enables the desalinated water introduced through the inlet pipe 30 to be more easily sucked away from the outlet port 14.

As shown in fig. 2, in some embodiments, a predetermined distance L is provided between the nozzle of the second end of the water inlet pipe 30 and a vertical plane a where the water outlet 14 is located and passes through the center of the accommodating chamber 11, wherein a ratio of the predetermined distance L to the inner diameter of the accommodating chamber 11 is equal to or less than 1/4. The above arrangement ensures that the mouth of the second end of the inlet tube 30 is close to the outlet 14, so that the demineralized water introduced through the inlet tube 30 is directly sucked away from the outlet 14. It should be noted that in some embodiments, the nozzle of the second end of the water inlet pipe 30 may be located in the vertical plane a, and the value of the preset distance L is zero.

It should be noted that the number of the water inlets 12 is not limited to one shown in the figures, and in other embodiments, the number of the water inlets 12 may be multiple, in which case, each water inlet 12 is connected to the position below the liquid level of the demineralized water by the water inlet pipe 30, and the setting heights of the nozzles at the second ends of the multiple water inlet pipes 30 may be the same or different.

In some embodiments, the isolation structure 20 is hermetically connected to the water inlet pipe 30, and the isolation structure 20 is hermetically connected to the wall of the accommodating chamber 11. The term "hermetically connected" means that the isolation structure 20 is tightly fitted with the water inlet pipe 30 and the wall of the accommodating chamber 11, and no gap exists or the gap is within an allowable range, so as to ensure the isolation effect of the isolation structure 20 on the desalted water and the air in the accommodating chamber 11. Further, as shown in fig. 1, the isolation structure 20 includes a plurality of floating balls, and the specific number of the floating balls is based on the level of the demineralized water which can be fully paved. After a plurality of floaters were placed in holding chamber 11, each floater can float on the liquid level of demineralized water, and the mutual contact is in order to form the isolation layer between a plurality of floaters, when guaranteeing to keep apart the effect, the structure is simpler to arrange more easily. Wherein, the specific shape and structure of the floating ball are not limited. For example, the cross-section of the float ball may be circular or hexagonal; or, the floater can include the spheroid and set up at the cover border of spheroid circumference, and the gap between the adjacent floater can be sheltered from through covering the border overlap.

Of course, the specific structure of the isolation structure 20 is not limited to this, and in other embodiments not shown in the drawings, the isolation structure 20 may also be other structures capable of achieving an isolation effect, such as a floating plate, an isolation film, and the like. Furthermore, the manner of the airtight connection between the isolating structure 20 and the water inlet pipe 30 and the wall of the accommodating chamber 11 is not limited. For example, the isolation structure 20 includes a plurality of flexible isolation strips and a plurality of floating balls, wherein one of the flexible isolation strips is tightly attached to the outer peripheral wall of the water inlet pipe 30 for a circle, the other flexible isolation strip is tightly attached to the cavity wall of the accommodating cavity 11 for a circle, the plurality of floating balls are fully paved in the space between the two flexible isolation strips, and the surface shape of the flexible isolation strips changes under the action of external force, so that the flexible isolation strips can be more suitable for the shape of the floating balls in contact with the flexible isolation strips, and are in tight contact with the floating balls.

In some embodiments, as shown in fig. 1, the bottom of the box 10 is provided with a sewage draining outlet 15 communicated with the accommodating chamber 11, and the water outlet 14 is higher than the horizontal plane of the sewage draining outlet 15. The soil discharge opening 15 may be selectively opened or closed. Because the impurities in the desalted water generally precipitate on the bottom wall of the accommodating cavity 11, the height of the sewage discharge outlet 15 is set to be lower (for example, the sewage discharge outlet is arranged close to the bottom wall of the accommodating cavity 11), so that the precipitated impurities can be discharged smoothly during sewage discharge; setting the height of the outlet 14 higher (e.g., higher than the drain outlet 15) ensures that the demineralized water will not carry impurities out together when it exits.

As shown in FIG. 1, in some embodiments, the demineralized water tank 100 further includes a level gauge 40, a first end of the level gauge 40 being secured above the isolation structure 20, and a second end of the level gauge 40 passing through the isolation structure 20 and extending below the surface of the demineralized water. The level gauge 40 may be any type of contact level gauge, such as a magnetic flip-flop level gauge, a magnetic float level gauge, or the like. The level of the demineralized water in the demineralized water tank 100 can be measured in real time by the level meter 40. In some embodiments, a regulating valve 900 is further disposed between the deaerating water feed pump 200 and the deaerator 300, and in general, the deaerating water feed pump 200 is always in an operating state, that is, the demineralized water in the demineralized water tank 100 is always discharged, and the regulating valve 900 can regulate the demineralized water discharge amount of the demineralized water tank 100 through the deaerating water feed pump 200 in real time according to the liquid level condition in the deaerator 300. The demineralized water inflow of the demineralized water tank 100 is adjusted according to the real-time liquid level data measured by the liquid level meter 40, so that the liquid level of the demineralized water in the demineralized water tank 100 is maintained within a certain range.

Further, an overflow port 16 is disposed on a side wall of the tank 10, and the overflow port 16 is higher than a horizontal plane where the first end of the liquid level meter 40 is located, or the overflow port 16 and the first end of the liquid level meter 40 are located on the same horizontal plane. Wherein, the first end of the liquid level meter 40 is the highest position where the liquid level meter 40 can perform liquid level measurement. The overflow 16 is normally open and the overflow 16 is used to drain the demineralized water when the level of the demineralized water is at the level of the overflow 16, thus avoiding an excessively high level of demineralized water (which would normally be above the measuring range of the level gauge 40).

In some embodiments, as shown in fig. 1, the top of the box 10 is provided with an exhaust pipe 18, the exhaust pipe 18 comprises a straight pipe section and a bent pipe section, two ends of the straight pipe section are respectively connected with the box 10 and the bent pipe section, the bent pipe section is bent downwards, and a pipe opening of one end of the bent pipe section far away from the straight pipe section forms the exhaust port 13. At this time, the opening direction of the exhaust port 13 is downward, and the exhaust port 13 is in a normally open state, so that the impurities in the external environment can be prevented from entering the accommodating cavity 11 through the exhaust port 13. Since the overflow port 16 is also in a normally open state, it may be provided in a similar configuration.

In some embodiments, the shape of the cross-section of the housing 10 is not limited, and may be, for example, circular, rectangular, or other shapes. A ladder stand is provided on the outer wall of the tank body 10 so that it is convenient for a worker to climb to the top of the demineralized water tank 100 for operation. In addition, the demineralized water tank 100 is a plurality of adjacent settings usually, can connect through the platform between the top region of adjacent demineralized water tank 100 to be convenient for the staff to walk about between adjacent demineralized water tank 100, it is more convenient.

As shown in fig. 1, in some embodiments, the bottom of the tank 10 is provided with a manhole 19, and the manhole 19 can be selectively opened or closed. When the manhole 19 is opened, a worker may perform operations such as maintenance, assembly, cleaning, etc. of the desalination tank 100 through the manhole 19. The top of the case 10 is provided with a light-transmitting portion 17, and the light-transmitting portion 17 can be selectively opened or closed. When the light-transmitting portion 17 is opened, external light enters the accommodating cavity 11 from the light-transmitting portion 17, so that a worker can conveniently operate or observe the accommodating cavity 11. The specific structure of the light transmitting portion 17 is not limited. For example, the device can comprise a light transmission hole and a light-shading shielding plate arranged on the light transmission hole, wherein the light-shading shielding plate can be manually or automatically controlled to rotate to open or close; alternatively, it may include a light-transmitting plate and a light-shielding shutter stacked above the light-transmitting plate, the light-shielding shutter being manually or automatically controlled to slide to open or close.

As shown in fig. 3, the utility model further provides a dry quenching system, which comprises a demineralized water tank 100, a deoxygenation water feed pump 200, a deoxygenator 300, a boiler water feed pump 500 and a boiler 600, which are sequentially communicated, wherein the demineralized water in the demineralized water tank 100 is pumped into the deoxygenator 300 through the deoxygenation water feed pump 200 to be deoxygenated, and the deoxygenated demineralized water is pumped into the boiler 600 through the boiler water feed pump 500, wherein the demineralized water tank 100 is the above demineralized water tank 100. In the specific embodiment shown in the figure, the deaerator 300 and the boiler feed water pump 500 are further provided with an auxiliary deaerator 400, and if the oxygen content in the desalted water after being deaerated by the deaerator 300 cannot meet the water quality requirement of the boiler feed water, the auxiliary deaerator 400 is required to be deaerated by a medicament.

Further, as shown in fig. 3, in some embodiments, the coke dry quenching system further includes a steam turbine 700 and a steam condenser 800, the steam turbine 700 and the steam condenser 800 are sequentially communicated between the boiler 600 and the demineralized water tank 100, the deoxidized demineralized water exchanges heat in the boiler 600 to form steam, and the steam sequentially passes through the steam turbine 700 and the steam condenser 800 to form condensed water and is returned to the demineralized water tank 100. It should be noted that what is shown in fig. 3 is specifically a portion mainly used for waste heat recovery in the dry quenching system, the boiler 600 is a waste heat boiler, the deaerated demineralized water exchanges heat with the circulating gas used for cooling the red coke in the dry quenching system in the boiler 600 to form steam, the steam carries heat in the circulating gas (i.e., heat in the red coke) at this time, the steam enters the steam turbine 700, the steam turbine 700 performs work outwards to generate power, and exhaust steam generated by the steam turbine 700 is condensed into condensed water through the condenser 800 and then returns to the demineralized water tank 100.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the utility model, and these modifications and improvements are also considered to be within the scope of the utility model.

Claims (10)

1. A demineralized water tank for storing demineralized water and pumping the demineralized water to a deaerator by a deaerating feed pump, characterized in that the demineralized water tank comprises:

the box body is provided with an accommodating cavity for accommodating the desalted water, the top of the box body is provided with a water inlet and an air outlet which are communicated with the accommodating cavity, the bottom of the box body is provided with a water outlet which is communicated with the accommodating cavity, the air outlet is communicated with the atmosphere, and the water outlet is communicated with the deoxidizing water-feeding pump;

the isolation structure is arranged in the accommodating cavity, can float up and down along with the lifting of the liquid level of the demineralized water, and is used for isolating the demineralized water from the air in the accommodating cavity;

the inlet tube, the first end of inlet tube connect in the water inlet, the second end of inlet tube passes isolation structure stretches into extremely below the liquid level of demineralized water, just the mouth of pipe of the second end of inlet tube is close to the delivery port makes by the inlet tube lets in demineralized water directly reachs near delivery port with can the deoxidization feed pump in time siphons away.

2. The demineralized water tank of claim 1 wherein the orifice of the second end of the inlet conduit is in the same horizontal plane as the outlet; and/or a preset distance is reserved between the pipe orifice of the second end of the water inlet pipe and a vertical plane where the water outlet is located and passes through the center of the accommodating cavity, wherein the ratio of the preset distance to the inner diameter of the accommodating cavity is less than or equal to 1/4.

3. The demineralized water tank of claim 1 wherein the isolation structure is in sealed connection with the inlet tube and the isolation structure is in sealed connection with the wall of the receiving chamber.

4. The demineralized water tank of claim 1 wherein said isolation structure includes a plurality of floating balls, each of said floating balls is capable of floating on the surface of the demineralized water when said floating balls are placed in said receiving cavity, and said floating balls contact each other to form an isolation layer.

5. The demineralized water tank of claim 1 characterized in that the bottom of the tank body is provided with a drain outlet communicated with the accommodating cavity, and the water outlet is higher than the horizontal plane of the drain outlet.

6. The demineralized water tank of claim 1, further comprising a liquid level meter, wherein a first end of the liquid level meter is fixed above the isolation structure, a second end of the liquid level meter passes through the isolation structure and extends below the surface of the demineralized water, an overflow port is arranged on a side wall of the tank body, and the overflow port is higher than a horizontal plane where the first end of the liquid level meter is located, or the overflow port and the first end of the liquid level meter are located on the same horizontal plane.

7. The demineralized water tank of claim 1 wherein the top of the tank body is provided with a light-transmitting portion, the light-transmitting portion can be selectively opened or closed, and when the light-transmitting portion is opened, external light enters the accommodating cavity from the light-transmitting portion.

8. The demineralized water tank of claim 1, wherein an exhaust pipe is arranged at the top of the tank body, the exhaust pipe comprises a straight pipe section and a bent pipe section, two ends of the straight pipe section are respectively connected with the tank body and the bent pipe section, the bent pipe section is bent downwards, and a pipe orifice of one end of the bent pipe section, which is far away from the straight pipe section, forms the exhaust port.

9. The utility model provides a dry quenching system, its characterized in that, including desalination water tank, deoxidization feed water pump, oxygen-eliminating device, boiler feed water pump and the boiler that communicates in proper order, the demineralized water in the desalination water tank passes through deoxidization feed water pump send to carry out the deoxidization in the oxygen-eliminating device, after the deoxidization the demineralized water passes through boiler feed water pump send to in the boiler, wherein, the desalination water tank be any one of claim 1 to 8 the desalination water tank.

10. The dry quenching system of claim 9, further comprising a steam turbine and a condenser, wherein the steam turbine and the condenser are sequentially communicated between the boiler and the demineralized water tank, the demineralized water after being deoxygenated exchanges heat in the boiler to form steam, and the steam sequentially passes through the steam turbine and the condenser to form condensed water and returns to the demineralized water tank.

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