CN111810933A

CN111810933A - Forced circulation evaporation system

Info

Publication number: CN111810933A
Application number: CN202010676378.9A
Authority: CN
Inventors: 谢君辉; 刘东平; 何华明; 薛凤丽
Original assignee: Zhejiang Junhua Shiye New Energy Equipment Co ltd
Current assignee: Zhejiang Junhua Shiye New Energy Equipment Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-10-23

Abstract

The application discloses a forced circulation evaporation system, which comprises a separator, a circulating water pump and a heater, wherein the circulating water pump and the heater are arranged on a circulating pipeline; the circulating water pump is arranged on a pipeline between the water distribution box and the separator, and the steam collection box is communicated with the separator; a water flow protection switch for detecting flow and a hot water throttling device for controlling flow are arranged on an evaporation pipeline between the heating pipe and the water distribution box, and the hot water throttling device is controlled by the water flow protection switch; the separator is connected with a water replenishing pipeline, and a water replenishing pump is arranged on the water replenishing pipeline. Through the setting of knockout drum and steam collection box, eliminate the influence of water fluctuation, outlet pressure change, in addition rivers protection switch and hot water throttling arrangement, the distribution of each parallel pipeline of effectual assurance is even.

Description

Forced circulation evaporation system

Technical Field

The application relates to the technical field of boiler water circulation systems, in particular to a forced circulation evaporation system.

Background

Forced circulation evaporators are circulated with an external power, and the solution is forced by a pump in one direction through a heating tube at a speed of 2-5 m/s. In forced circulation evaporation systems, the flow of working fluid (the medium substance that converts thermal energy and mechanical energy into each other) is pushed by the head of the circulation pump.

At present, the evaporation system of domestic evaporators mostly adopts a single-cycle multiplying power (namely, a through-flow type) mode, and adopts a structure that one water pump corresponds to one evaporation pipeline, namely, the water pump sends water in a separator into a heating pipe for heating, then forms water vapor and sends the water vapor back to the upper part of the separator for steam-water separation.

When multiple pipelines are operated in parallel, because each pipeline is driven by one water pump, resistance and heat transfer deterioration caused by scale and resistance increase caused by volume expansion caused by working medium phase change easily occur the phenomenon of uneven pipeline distribution caused by factors such as uneven combustion heat density, large water supply fluctuation, load change, outlet pressure change and the like.

Disclosure of Invention

In order to solve the uneven distribution problem that many pipelines connect in parallel and cause, this application provides a forced circulation's vaporization system.

The application provides an evaporation system of forced circulation adopts following technical scheme:

a forced circulation evaporation system comprises a separator, a circulating water pump and a heater, wherein the circulating water pump and the heater are arranged on a circulating pipeline, a water distribution box and a steam collection box are further arranged on the circulating pipeline, a plurality of evaporation pipelines are arranged between the water distribution box and the steam collection box, the heater comprises heating pipes, the number of the heating pipes is the same as that of the evaporation pipelines, and each evaporation pipeline is provided with a heating pipe; the circulating water pump is arranged on a pipeline between the water distribution box and the separator, and the steam collection box is communicated with the separator;

a water flow protection switch for detecting flow and a hot water throttling device for controlling flow are arranged on an evaporation pipeline between the heating pipe and the water distribution box, and the hot water throttling device is controlled by the water flow protection switch;

and the separator is connected with a water replenishing pipeline, and a water replenishing pump is arranged on the water replenishing pipeline.

Through adopting above-mentioned technical scheme, through the setting of knockout drum and steam collection box for can fall into a plurality of parallelly connected pipelines with the pipeline all the way, and all drive through a circulating water pump between the pipeline, so can effectual guarantee feedwater fluctuation, export pressure change can not lead to the fact the uneven phenomenon of distribution between the parallelly connected pipeline. On this basis, set up rivers protection switch and hot water throttling arrangement again, when the circumstances such as the combustion heat density is inhomogeneous, load change caused the distribution uneven, rivers protection switch can detect and adjust through the control to hot water throttling arrangement to the distribution of each parallel pipeline of effectual assurance is even.

More preferably: the bottom of the separator is provided with a drain outlet, the drain outlet is connected with a timing drain pipe, and the timing drain pipe is provided with a timing electromagnetic valve.

Through adopting above-mentioned technical scheme, carry out the blowdown regularly to the separator, deposit impurity discharge with the large granule for keep the impurity of separator water-logging not stockpiled too high, thereby can slow down the interior scale deposit phenomenon of circulating line.

More preferably: a siphon device is arranged on the separator and comprises a horizontally arranged drain pipe and a horn pipe connected to the drain pipe, a small throttling hole for communicating the drain pipe and the horn pipe penetrates through the side wall of the drain pipe, and the aperture of the small throttling hole is smaller than the inner diameter of the horn pipe;

one end of the horn pipe, which is far away from the sewage discharge pipe, is upwards inserted into the separator, one end of the horn pipe, which is far away from the sewage discharge pipe, is provided with an oblique notch, and the side wall of one side, which is close to the sewage discharge pipe, of the oblique notch is provided with a horn groove;

the position of the sewage discharge pipe is lower than the low water level of the separator, and the normal water level of the separator is positioned between the upper end and the lower end of the horn groove.

Through adopting above-mentioned technical scheme, the water level of separator divide into low water level, normal water level and high water level, and when normal use, the water level is located between low water level and the high water level, and consequently, the water level is higher than the lowest of loudspeaker groove, and siphon device forms the siphon effect, the continuous discharge of moisture of the salt highest point in the separator during with normal operation to reduce the salinity of moisture in the separator, thereby slow down the interior scale deposit phenomenon of circulating line during normal operation.

More preferably: the separator comprises a cylinder body, wherein a steam outlet, a steam water inlet connected with a steam collecting box and a water outlet connected with a circulating water pump are arranged on the cylinder body, the cylinder body comprises an upper cylinder body and a lower cylinder body which are communicated with each other, the steam water inlet is arranged on the side wall of the upper end of the upper cylinder body, the axial line of the steam water inlet deviates from the axial line of the upper cylinder body, a separating inner cylinder is arranged on an upper cover plate of the upper cylinder body, the length of the separating inner cylinder is smaller than that of the upper cylinder body, and a steam outlet communicated with the separating inner cylinder is arranged on the upper cover plate; the water outlet is arranged on the lower barrel.

Through adopting above-mentioned technical scheme, steam gets into and carries out the rotation separation in the barrel, and the steam that density is light in the steam gets rid of to the center, gets into the separation inner tube by separation inner tube lower part to carry out gravity separation once more in the separation inner tube, and the great water of density then adheres to the wall and flows downwards and gets into down in the barrel, can effectual improvement steam-water separation effect under the dual function through gravity and screw force, thereby the water content of effectual reduction steam.

More preferably: the diameter of the lower barrel is smaller than that of the upper barrel, a conical connecting section is arranged between the lower barrel and the upper barrel, the top of the conical connecting section is connected with the upper barrel, and the bottom of the conical connecting section is connected with the lower barrel; the inner side walls of the lower barrel and the conical connecting section are at least provided with a water stabilizing plate, and the surface of the water stabilizing plate is positioned on the axis of the lower barrel.

By adopting the technical scheme, the steam space is larger due to different designs, and a better separation effect can be achieved; simultaneously because rotatory inertial force acts on, the water that separates has certain speed, consequently blocks through steady water board in order to weaken the momentum for the momentum of water can not assault the aquatic in the lower barrel, in order to reach the effect of stabilizing separator water space water level.

More preferably: the lower extreme of water stabilizing plate is supported and is located on the delivery port, just the bottom of water stabilizing plate is along the width gradually big setting of barrel axis direction down.

Through adopting above-mentioned technical scheme, can restrain the production of delivery port whirl when water to the stability of guarantee water level that can be further.

More preferably: the separator is characterized by further comprising a water level meter sleeve, wherein a liquid level meter, the bottom and the lower barrel are arranged at the top of the water level meter sleeve, an exhaust pipe is connected between the side wall of the conical connecting section and the side wall of the water level meter sleeve, and the two ends of the exhaust pipe are respectively communicated with the conical connecting section and the water level meter sleeve.

Through adopting above-mentioned technical scheme, set up the level gauge in the water level gauge sleeve pipe, can reduce the influence of water level stability to the level gauge to make the detection of level gauge more accurate.

More preferably: the exhaust pipe extends towards the conical connecting section and is connected with a water level gauge stabilizing cover, and an opening which is arranged downwards is formed in the water level gauge stabilizing cover.

Through adopting above-mentioned technical scheme, the setting of cover is stabilized to the fluviograph, forms the opening of giving vent to anger of blast pipe down, and then avoids inside steam to cause to get into the fluviograph sleeve pipe from the blast pipe because of the rotation to influence the detection accuracy of fluviograph.

More preferably: be provided with continuous water supply equipment on the moisturizing pipeline, continuous water supply equipment is including parallelly connected governing valve and the constant current subassembly that sets up, the governing valve is controlled by the level gauge, the constant current subassembly includes constant current solenoid valve and the moisturizing throttling arrangement that is used for measuring flow, constant current solenoid valve sets up with moisturizing throttling arrangement series connection.

By adopting the technical scheme, the water supplementing quantity of the constant flow component is well adjusted according to the rated evaporation quantity of water in the separator, the water supplementing quantity is slightly lower than the rated evaporation quantity, so that the normal recycling of the separator is ensured, the water supplementing throttling device can ensure that small-flow continuous water supply is carried out, the water supply fluctuation is small, the flow change is not large, and the normal state can be in a state of being opened and supplemented with water all the time. When the water level in the separator is lower than the low water level due to water supply fluctuation caused by other factors such as load change and the like, the regulating valve is started to regulate, so that the normal operation of the water level in the separator between the low water level and the high water level is ensured.

More preferably: and the separation inner cylinder is provided with an overflow small hole.

Through adopting above-mentioned technical scheme for water on the separation inner tube can flow out from the overflow aperture, avoids steam to get into the atmospheric pressure that forms from the bottom and leads to water to be difficult for flowing downwards under the action of gravity, thereby leads to the steam water content to increase.

Drawings

FIG. 1 is a first structural schematic diagram of the first embodiment, which shows the structure of the inner part of the cylinder body and a water stabilizing plate;

FIG. 2 is a schematic structural diagram II of the first embodiment, which shows the structure of the inner part of the cylinder body and the water stabilizing plate;

FIG. 3 is a top view of the first embodiment;

FIG. 4 is a schematic structural view of the second embodiment;

FIG. 5 is a schematic structural view of a siphon device according to a second embodiment;

FIG. 6 is a schematic diagram of a third embodiment;

FIG. 7 is a schematic diagram of a fourth embodiment.

In the figure, 100, separator; 110. an upper cylinder body; 111. an upper cover plate; 112. a steam outlet; 120. a lower cylinder body; 121. a lower cover plate; 122. a water outlet; 123. a sewage draining outlet; 130. a steam-water inlet; 140. separating the inner barrel; 141. overflow small holes; 150. a tapered connecting section; 160. a water stabilizing plate; 170. a water gauge sleeve; 171. an exhaust pipe; 180. a liquid level meter; 190. a water gauge stabilizing cover; 191. an opening; 200. a siphon device; 210. a blow-off pipe; 211. a small orifice; 220. a flare tube; 221. a bevel notch; 222. a horn slot; 220. a timing electromagnetic valve; 300. a water replenishing pump; 400. a continuous water supply device; 410. adjusting a valve; 420. a constant flow component; 421. a constant flow solenoid valve; 422. a water replenishing throttling device; 500. a water circulating pump; 600. a water collection tank; 710. a water flow protection switch; 720. a hot water throttling device; 800. a heater; 810. heating a tube; 820. an electric resistance; 900. a steam collection box.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

Example 1: a separator, as shown in fig. 1, comprises a cylinder body which is divided into an upper cylinder body 110, a lower cylinder body 120 and a conical connecting section 150, wherein the upper cylinder body 110 and the lower cylinder body 120 are both cylindrical, the diameter of the upper cylinder body 110 is larger than that of the lower cylinder body 120, and the conical connecting section 150 connects the upper cylinder body 110 and the lower cylinder body 120.

An upper cover plate 111 is arranged at the top of the upper cylinder 110 for sealing, a steam inlet 130 is arranged on the side wall of the upper cylinder 110, and the steam inlet 130 is positioned at the top of the upper cylinder 110. Wherein, the axis of the steam inlet 130 is deviated from the axis of the upper cylinder 110, so that the steam can automatically form a spiral force after entering from the steam inlet 130.

The upper cover plate 111 is provided with a steam outlet 112, and the steam outlet 112 is communicated with the upper cylinder 110. The inner side of the upper cover plate 111 is provided with a separation inner cylinder 140, the steam outlet 112 and the upper cylinder 110 are coaxially arranged, and the diameter of the separation inner cylinder 140 is larger than that of the steam outlet 112. The length of the separation inner cylinder 140 is less than that of the upper cylinder 110, and the specific length and diameter are determined according to actual conditions. The bottom of the separation inner cylinder 140 is provided with an opening 191, a plurality of overflow small holes 141 are distributed on the side wall of the separation inner cylinder 140, the overflow small holes 141 penetrate through the side wall of the separation inner cylinder 140, the number of the overflow small holes 141 is 3 in the embodiment, and the overflow small holes 141 are located at the lower half position of the separation inner cylinder 140 and are uniformly distributed around the axial lead of the separation inner cylinder 140 (the uniform distribution is a preferable mode, and can be non-uniform or not arranged at the same horizontal position).

As shown in fig. 1 and 2, the tapered coupling segment 150 includes an upper cylindrical portion coupled to the upper cylinder 110 and a lower tapered portion coupled to the lower cylinder 120. The bottom of the lower cylinder 120 is provided with a lower cover plate 121, the lower cover plate 121 is provided with a water outlet 122 and a sewage outlet 123, the water outlet 122 is arranged at the center of the lower cover plate 121, the sewage outlet 123 is positioned at one side of the water outlet 122, and the water outlet 122 extends into the lower cylinder 120 and is higher than the sewage outlet 123 on the lower cover plate 121. A water replenishing opening (not shown in the figure) is arranged on the side wall of the lower cylinder 120 near the lower cover plate 121.

As shown in fig. 2 and 3, a water stabilizing plate 160 is disposed on the inner side wall of the lower cylinder 120 and the conical connection section 150, the surface of the water stabilizing plate 160 is located on the axial line of the lower cylinder 120, the lower end of the water stabilizing plate 160 abuts against the water outlet 122, and the bottom of the water stabilizing plate 160 is gradually wider along the axial line of the lower cylinder 120.

As shown in fig. 2, a water level meter sleeve 170 is disposed at one side of the cylinder, a liquid level meter 180 is disposed at the top of the water level meter sleeve 170, the bottom of the water level meter sleeve is communicated with the inside of the lower cylinder 120, an exhaust pipe 171 is connected between the side wall of the conical connection section 150 and the side wall of the water level meter sleeve 170, and two ends of the exhaust pipe 171 are respectively communicated with the conical connection section 150 and the water level meter sleeve 170. The exhaust pipe 171 extends into the conical connection section 150 to connect with a water level gauge stabilizing cover 190, and the water level gauge stabilizing cover 190 is provided with a downward opening 191.

The working principle is as follows: the steam water is fed from the steam water inlet 130 and enters the upper cylinder 110 for rotary separation, the steam with light density in the steam water is thrown to the center and enters the separation inner cylinder 140 from the lower part of the separation inner cylinder 140, and the steam is sent out from the steam outlet 112. Water drops are formed on the inner wall of the separation inner cylinder 140, larger water flows downwards along the wall to enter the lower cylinder 120, and part of water flows out of the overflow small holes 141 under the action of steam pressure.

The dense water flows downward while rotating on the upper cylinder 110 due to the rotational inertia force, and after the water enters the lower cylinder 120 of the tapered coupling section 150, the water still has a certain velocity, and is blocked by the water stabilizing plate 160 to reduce momentum, thereby flowing downward in the vertical direction.

Example 2: as shown in fig. 4 and 5, the difference from embodiment 1 is that a siphon device 200 is disposed on the separator 100, the siphon device 200 includes a drain pipe 210 and a flared pipe 220, the drain pipe 210 is horizontally disposed, and the position of the drain pipe 210 is lower than the low water level of the separator 100, one end of the flared pipe 220 is vertically connected to the drain pipe 210, a small throttling hole 211 for communicating the drain pipe 210 and the flared pipe 220 is disposed on the sidewall of the drain pipe 210 in a penetrating manner, and the aperture of the small throttling hole 211 is smaller than the inner diameter of the flared pipe 220.

One end of the flared tube 220, which is far away from the sewage pipe 210, is obliquely inserted upwards into the lower barrel 120, one end of the flared tube 220, which is far away from the sewage pipe 210, is provided with a beveled cut 221, the beveled cut 221 is provided with a flared groove 222 on the side wall, which is close to the sewage pipe 210, the flared groove 222 is in an upward flared shape, and the normal water level of the separator 100 is located between the upper end and the lower end of the flared groove 222.

The working principle is as follows: the difference from the embodiment is that continuous drainage is achieved by the siphon device 200, that is, the water level of the separator 100 is divided into a low water level, a normal water level and a high water level, and during normal use, the water level is between the low water level and the high water level, therefore, the water level is higher than the lowest position of the trumpet-shaped groove 222, the siphon device 200 forms a siphon effect, and water at the highest position of salt in the separator 100 is continuously drained during normal operation.

Example 3: a forced circulation evaporation system, as shown in figure 6, comprises a circulating water pump 500, a heater 800, a water replenishing pump 300 and the separator 100 in the embodiment 1, wherein water from a soft water tank enters a water replenishing pipeline, is sent into the separator 100 from a water replenishing port through the water replenishing pump 300, and is pumped into the circulating pipeline by the circulating water pump 500 through a water outlet 122, is heated by the heater 800 and then is sent into the separator 100 from a steam water inlet.

The continuous water supply device 400 is arranged on a water supply pipeline between the water replenishing pump 300 and the separator 100, the continuous water supply device 400 comprises an adjusting valve 410 and a constant flow component 420 which are arranged in parallel, the adjusting valve 410, the constant flow component 420 and the water replenishing pump 300 are connected through a three-way pipe, and the adjusting valve 410 is an electromagnetic valve and is controlled by the liquid level meter 180 of the separator 100 to be opened and closed. The constant flow assembly 420 includes a constant flow solenoid valve 421 and a water supply throttling device 422, the constant flow solenoid valve 421 is connected in series with the water supply throttling device 422, and the water supply throttling device 422 is the prior art.

A water distribution box and a steam collection box 900 are arranged on the circulating pipeline, a plurality of evaporation pipelines are arranged between the water distribution box and the steam collection box 900, and three parallel pipelines are taken as an example in the present case. Heater 800 includes three heating tubes 810, and each evaporating line is provided with a heating tube 810. A water flow protection switch 710 and a hot water throttling device 720 are arranged on an evaporation pipeline between the heating pipe 810 and the water collecting tank 600, the water flow protection switch 710 is used for detecting the medium flow, and the hot water throttling device 720 is controlled by the water flow protection switch 710 to control the medium flow. An electric resistance 820 is provided on an evaporation line between the heating pipe 810 and the steam collection box 900 to detect a temperature, and heating by the heater 800 may be stopped when the temperature is too high.

A timing drain pipe is connected to the drain outlet 123, a timing solenoid valve 220 is arranged on the timing drain pipe, and sewage is discharged into the trench through the timing drain pipe.

The working principle is as follows: the water in the separator 100 is pumped by the circulating water pump 500 and sent into the water collection tank 600, and is sent into three evaporation management after being divided in the water collection tank 600, and is sent into the heating pipe 810 to be heated after passing through the hot water throttling device 720 and the water flow protection switch 710, and the steam and water formed after heating are sent into the steam collection tank 900 to be collected and then sent into the separator 100 from the steam and water inlet to be subjected to steam and water separation.

Example 4: the difference from embodiment 3 is that the separator 100 of embodiment 2 is used in this embodiment, and the drain pipe 210 of the siphon device 200 discharges water into the trench.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A forced circulation evaporation system comprises a separator (100), a circulating water pump (500) and a heater (800) which are arranged on a circulating pipeline, and is characterized in that: a water distribution box and a steam collection box (900) are further arranged on the circulating pipeline, a plurality of evaporation pipelines are arranged between the water distribution box and the steam collection box (900), the heater (800) comprises heating pipes (810) the number of which is the same as that of the evaporation pipelines, and each evaporation pipeline is provided with one heating pipe (810); the circulating water pump (500) is arranged on a pipeline between the water distribution box and the separator (100), and the steam collection box (900) is communicated with the separator (100);

a water flow protection switch (710) for detecting flow and a hot water throttling device (720) for controlling flow are arranged on evaporation pipelines between the heating pipe (810) and the water distribution box, and the hot water throttling device (720) is controlled by the water flow protection switch (710);

the separator (100) is connected with a water replenishing pipeline, and a water replenishing pump (300) is arranged on the water replenishing pipeline.

2. A forced circulation evaporation system as claimed in claim 1, wherein: the bottom of the separator (100) is provided with a sewage outlet (123), the sewage outlet (123) is connected with a timing sewage pipe, and the timing sewage pipe is provided with a timing electromagnetic valve (220).

3. A forced circulation evaporation system as claimed in claim 1 or 2, wherein: a siphon device (200) is arranged on the separator (100), the siphon device (200) comprises a horizontally arranged drain pipe (210) and a flared pipe (220) connected to the drain pipe (210), a small throttling hole (211) for communicating the drain pipe (210) and the flared pipe (220) penetrates through the side wall of the drain pipe (210), and the aperture of the small throttling hole (211) is smaller than the inner diameter of the flared pipe (220);

one end of the flared tube (220), which is far away from the sewage discharge pipe (210), is upwards inserted into the separator (100), one end of the flared tube (220), which is far away from the sewage discharge pipe (210), is provided with a bevel cut (221), and the side wall of one side, which is close to the sewage discharge pipe (210), of the bevel cut (221) is provided with a flared groove (222);

the position of the sewage discharge pipe (210) is lower than the low water level of the separator (100), and the normal water level of the separator (100) is positioned between the upper end and the lower end of the horn groove (222).

4. A forced circulation evaporation system as claimed in claim 2, wherein: the separator (100) comprises a cylinder body, wherein a steam outlet (112), a steam water inlet (130) connected with a steam collection tank (900) and a water outlet (122) connected with a circulating water pump (500) are arranged on the cylinder body, the cylinder body comprises an upper cylinder body (110) and a lower cylinder body (120) which are communicated with each other, the steam water inlet (130) is arranged on the side wall of the upper end of the upper cylinder body (110), the axial line of the steam water inlet (130) deviates from the axial line of the upper cylinder body (110), a separating inner cylinder (140) is arranged on an upper cover plate (111) of the upper cylinder body (110), the length of the separating inner cylinder (140) is smaller than that of the upper cylinder body (110), and the steam outlet (112) communicated with the separating inner cylinder (140) is arranged on the upper cover plate (111); the water outlet (122) is arranged on the lower cylinder body (120).

5. A forced circulation evaporation system according to claim 4, wherein: the diameter of the lower cylinder body (120) is smaller than that of the upper cylinder body (110), a conical connecting section (150) is arranged between the lower cylinder body (120) and the upper cylinder body (110), the top of the conical connecting section (150) is connected with the upper cylinder body (110), and the bottom of the conical connecting section is connected with the lower cylinder body (120); the inner side walls of the lower cylinder (120) and the conical connecting section (150) are at least provided with a water stabilizing plate (160), and the surface of the water stabilizing plate (160) is positioned on the axis of the lower cylinder (120).

6. A forced circulation evaporation system as claimed in claim 5, wherein: the lower end of the water stabilizing plate (160) is abutted to the water outlet (122), and the width of the bottom of the water stabilizing plate (160) along the axial lead direction of the lower cylinder body (120) is gradually increased.

7. A forced circulation evaporation system according to claim 4, wherein: the separator (100) further comprises a water level meter sleeve (170), the top of the water level meter sleeve (170) is provided with a liquid level meter (180), the bottom of the water level meter sleeve is communicated with the interior of the lower barrel (120), an exhaust pipe (171) is connected between the side wall of the conical connecting section (150) and the side wall of the water level meter sleeve (170), and two ends of the exhaust pipe (171) are communicated with the conical connecting section (150) and the water level meter sleeve (170) respectively.

8. A forced circulation evaporation system as claimed in claim 7, wherein: the exhaust pipe (171) extends towards the conical connecting section (150) and is connected with a water level gauge stabilizing cover (190), and an opening (191) arranged downwards is formed in the water level gauge stabilizing cover (190).

9. A forced circulation evaporation system as claimed in claim 7 or 8, wherein: be provided with continuous water supply installation (400) on the moisturizing pipeline, continuous water supply installation (400) are including parallelly connected governing valve (410) and the constant flow subassembly (420) that sets up, governing valve (410) are controlled by level gauge (180), constant flow subassembly (420) are including constant flow solenoid valve (421) and be used for detecting the moisturizing throttling arrangement (422) of flow, constant flow solenoid valve (421) and moisturizing throttling arrangement (422) series connection set up.

10. A forced circulation evaporation system according to claim 4, wherein: the separating inner cylinder (140) is provided with overflow small holes (141).