CN218846111U

CN218846111U - Steam generating equipment and liquid level measurer thereof

Info

Publication number: CN218846111U
Application number: CN202223037966.1U
Authority: CN
Inventors: 段毅
Original assignee: Anhui Rejing Boiler Co ltd
Current assignee: Anhui Rejing Boiler Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-04-11
Anticipated expiration: 2032-11-15

Abstract

Disclosed are a steam generating apparatus and a liquid level measurer thereof, the liquid level measurer including: a first measurement assembly comprising: a first measuring tube and a liquid level meter for detecting the liquid level inside the first measuring tube; the first measurement pipe having a first upper end and a first lower end below the first upper end; the first measuring pipe is also provided with an upper communicating structure close to the first upper end and a lower communicating structure close to the first lower end; the upper communicating structure and the lower communicating structure are used for communicating the first measuring pipe with a steam generating body for generating steam; a second measurement assembly comprising: a second measuring tube and a detecting piece for detecting the liquid level inside the second measuring tube; the second measuring pipe is provided with an upper communicating part which is used for communicating the second measuring pipe with the first measuring pipe and a lower communicating part which is positioned below the upper communicating part; the upper and lower communicating portions are located below a middle height position between the upper communicating structure and the lower communicating structure.

Description

Steam generating equipment and liquid level measurer thereof

Technical Field

The present disclosure relates to the field of steam generation technologies, and in particular, to a steam generation device and an operation method thereof.

Background

Under the call of national energy conservation and emission reduction, the steam generating equipment is accelerated to develop into a full-premixing condensing type with high efficiency and low emission. Especially, compared with the traditional steam boiler, the monitoring-free/report-free through-flow type gas steam generator has the advantages of higher steam production speed, energy conservation and environmental protection, no need of installation of report and check and annual boiler examination, wide market favor, and wide application in national production and life, such as hotels, food processing, textile, chemical industry, feed processing and other industries.

However, the actual water volume of the inspection-free through-flow gas steam generator in the existing market is generally over standard, and particularly after the 2020-version boiler specification is issued and implemented, a water volume calculation mode, namely the geometric total volume in an inlet and an outlet of a steam-water system, including the internal volume of all pressure-bearing spaces from an outlet of a feed pump to a steam outlet of equipment is determined, and based on the calculation mode, the water volume of most of the through-flow gas steam generators in the existing market is far over 30 liters and does not meet the inspection-free standard of the boiler specification.

The conventional through-flow gas steam generator is provided with a liquid level measurer to measure the height of the water level in the through-flow gas steam generator, so that the safety problems of dry burning and the like caused by too low water level are avoided. However, the current liquid level measurement device is of a double-pipe structure, is communicated with the inside of the steam generator by utilizing the principle of a communicating vessel, is used as a rear-end pressure bearing assembly, has larger assembly space, can occupy certain water volume, and is not beneficial to reaching the inspection-free standard of a pot gauge.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, it is an object of the present disclosure to provide a steam generating device and a liquid level gauge thereof that can improve water volume.

In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows:

a liquid level gauge for a steam generating apparatus, the liquid level gauge comprising:

a first measurement assembly comprising: a first measuring tube and a liquid level meter for detecting the liquid level inside the first measuring tube; the first measurement pipe having a first upper end and a first lower end below the first upper end; the first measuring pipe is also provided with an upper communicating structure close to the first upper end and a lower communicating structure close to the first lower end; the upper communicating structure and the lower communicating structure are used for communicating the first measuring pipe with a steam generating body for generating steam;

a second measurement assembly comprising: a second measuring tube and a detecting piece for detecting the liquid level inside the second measuring tube; the second measuring pipe is provided with an upper communicating part which is used for communicating the second measuring pipe with the first measuring pipe and a lower communicating part which is positioned below the upper communicating part; the upper and lower communicating portions are located below a middle height position between the upper communicating structure and the lower communicating structure.

As one aspect of the present application, the upper and lower communication portions are located above the lower communication structure; the second measurement pipe is located below an intermediate height position between the upper and lower communicating ends.

As one aspect of the present application, one of the first upper end and the first lower end is a plugging end, and the other is inserted with a liquid level meter; the second measurement pipe having a second upper end and a second lower end below the second upper end; one of the second upper end and the second lower end is blocked, and the other end is inserted into a detection piece;

the upper communication structure comprises an upper connector tube vertically communicated with the first measuring tube and a connecting flange fixedly arranged at the tube end of the upper connector tube; the lower communication structure comprises a lower interface pipe vertically communicated with the first measuring pipe and a connecting flange fixedly arranged at the pipe end of the lower interface pipe and the upper interface pipe;

specifically, the liquid level meter is inserted into the first measuring pipe from the first lower end upwards; the detecting member is inserted into the second measuring tube from the second upper end downward.

As one aspect of the present application, a perpendicular projection length of the second measurement pipe in a direction in which the first measurement pipe extends is less than half of the first measurement pipe, and further, a perpendicular projection length of the second measurement pipe is less than half of a distance between the upper communicating structure and the lower communicating structure; further, the second measurement pipe has a vertical projection length less than one third of the distance between the upper and lower communicating structures

As one aspect of the present application, the second measurement pipe is disposed in parallel with the first measurement pipe; the inner diameter of the second measuring pipe is 20-35mm, and the inner diameter of the first measuring pipe is 40-60mm; further, the inner diameter of the second measuring pipe is 25-30mm, and the inner diameter of the first measuring pipe is 42-50mm.

As one aspect of the present application, the upper communication portion includes an upper communication pipe that communicates the first measurement pipe and the second measurement pipe; the lower communicating part comprises a lower communicating pipe for communicating the first measuring pipe and the second measuring pipe; the distance between the upper communicating pipe and the lower communicating pipe is less than one fourth of the distance between the upper communicating structure and the lower communicating structure.

As an aspect of the present application, the liquid level meter is a capacitive liquid level meter; the detection piece is a liquid level probe.

As an aspect of the present application, the upper communicating pipe and the lower communicating pipe are parallel and vertically communicate with the first measuring pipe and the second measuring pipe;

the length of the first measuring tube is more than 400mm and less than 1000 mm; the length of the second measurement pipe is more than 80mm and less than 300 mm; the distance between the upper communicating pipe and the lower communicating pipe is more than 40mm and less than 250 mm; the inner diameter of the upper communicating pipe is more than 10 mm; the length of the upper communicating pipe is more than 40mm, and more specifically, the length of the upper communicating pipe is more than 60mm.

As one aspect of the present application, the downcomer communicates with the lower end of the second measurement duct through a 90 degree elbow joint; the first measuring pipe is arranged below the lower communicating part and is also communicated with a sewage discharge structure.

A steam generating apparatus comprising:

a steam generating body for generating steam, having an upper header, a lower header, and a heat exchange unit between the upper header and the lower header; the heat exchange unit comprises a plurality of vertical heat exchange tubes which are distributed along the circumferential direction;

a liquid level gauge as described in any of the above; the liquid level measurer is communicated with different height positions of the steam generating body through an upper communicating structure and a lower communicating structure.

Has the advantages that:

according to the steam generating device and the liquid level measurer thereof disclosed by the embodiment of the disclosure, the pressure-bearing water volume of the steam device can be improved, the internal geometric volume of the steam generating device from the water outlet end of the second water pump to the steam output end of the steam generating body is reduced to be below 30L, the manufacturing materials of the liquid level measurer are reduced, and the manufacturing cost is further saved.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic view of the internal structure of a steam generating apparatus according to an embodiment of the present disclosure;

FIG. 2 is another view of FIG. 1;

FIG. 3 is an elevation view of the liquid level gauge of FIG. 1;

FIG. 4 is a labeled view of FIG. 3;

FIG. 5 is a right side view of FIG. 3;

FIG. 6 is a partial cross-sectional view of FIG. 3;

FIG. 7 is an elevation view of a liquid level gauge provided by another embodiment of the present disclosure.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 6, one embodiment of the present disclosure provides a steam generating apparatus and a liquid level measuring device thereof. The steam generating equipment is applicable to, but not limited to, a non-inspection type steam generator or a steam boiler, and the water volume of the steam generating equipment is below 30L.

The steam generating apparatus includes: the heat exchanger comprises a first heat exchange assembly, a second heat exchange assembly, a first water pump 10 and a second water pump 40. Wherein, first heat exchange assembly has limited first flue gas runner and the first heat exchange assembly of steam generation runner. And the water in the steam generation channel exchanges heat with the flue gas in the first flue gas channel to form steam. The first heat exchange assembly is provided with a body water inlet end for inputting water and a smoke output end for outputting smoke. The steam generating apparatus has a casing 100, and a first heat exchange assembly, a second heat exchange assembly, a first water pump 10, and a second water pump 40 are located inside the casing 100.

The second heat exchange assembly is limited with a second flue gas flow channel (flue gas flowing space) and a preheating flow channel (water flow space). The second flue gas runner is communicated with the downstream of the first flue gas runner. And the water in the preheating flow channel exchanges heat with the flue gas in the second flue gas flow channel to be heated. The preheating flow channel is provided with a first water inlet end and a first water outlet end. In this embodiment, the water inlet end and the water outlet end are configured with flange connection structures.

The first water pump 10 is communicated with the upstream of the first water inlet end. The water inlet end of the first water pump 10 is externally supplied with water and is configured to be communicated with a water inlet container. The water inlet container may be provided by an external water tank, or may be provided by a water tower or a water tank, and the disclosure is not limited thereto.

The head of the first water pump 10 is configured to be greater than the water resistance of the second heat exchange assembly. The second water pump 40 is communicated between the first water outlet end and the water inlet end of the body, and the lift of the second water pump 40 is larger than that of the first water pump 10. The first water pump 10, the heat exchanger 20 (one embodiment of the second heat exchange assembly), the second water pump 40, and the steam generating body 50 (one embodiment of the first heat exchange assembly) are sequentially (sequentially) communicated in series. The water flow sequentially passes through the first water pump 10, the heat exchanger 20 and the second water pump 40 to enter the steam generating body 50.

The lift of the first water pump 10 is less than 10m, and the lift of the second water pump 40 is greater than 10m. Further, the lift of the first water pump 10 is greater than 2m and less than 10m, and the lift of the second water pump 40 is greater than 40m. Furthermore, the lift of the first water pump 10 is greater than 5m and smaller than 9m, and the lift of the second water pump 40 is greater than 80m, so that the water supplementing efficiency and the steam output efficiency are ensured.

The inner geometric volume of the steam generating device from the water outlet end of the second water pump 40 to the steam output end of the steam generating body 50 is below 30L. The first water pump 10 is a fixed-frequency pump, the second water pump 40 is a variable-frequency pump, and specifically, the second water pump 40 may be a multi-stage centrifugal variable-frequency pump to provide a large lift and form a pressure-bearing water path downstream thereof. As shown in fig. 1, the first water pump 10 is a 6 m-head fixed-frequency pump, and the second water pump 40 is a 150 m-head booster pump (variable-frequency pump). The upstream waterway of the second water pump 40 is a normal pressure pipeline (unpressurized pipeline), and the downstream waterway thereof is a pressurized pipeline.

In this embodiment, the steam generating device is a once-through steam generator. Specifically, as shown in fig. 1 and 2, the first heat exchange assembly includes a steam generating body 50 (furnace body) having a body water inlet end for inputting water and a flue gas output end 55 for outputting flue gas. The steam generating body 50 serves to heat water to generate steam. Specifically, the steam generating body 50 includes a housing, a heat exchanging unit disposed in the housing, and a burner extending into a combustion space defined by the heat exchanging unit. The combustor is a cylindrical combustor. The steam generating body 50 has an upper header defined at an upper end thereof and a lower header defined at a lower end thereof. The heat exchange unit is defined between the upper header and the lower header. The heat exchange unit is a plurality of vertical heat exchange tubes which are arranged along the circumferential direction in a single circle. A steam generation flow channel is formed inside the vertical heat exchange tube, and a first flue gas flow channel is formed outside the vertical heat exchange tube. The first flue gas flow channel is communicated with the flue gas output end. The steam generating body 50 is provided with only a single turn of vertical heat exchange tubes to reduce water volume.

One end (generally the lower end) of the burner is communicated with a fan 60, and the fan 60 is communicated with a gas valve. The fan 60 has a gas inlet and an air inlet, the air inlet is connected to a filter, and the gas inlet is connected to a gas valve. Also provided in the steam generating body 50 are an ignition part such as an ignition needle for ignition of the burner and a flame detector such as a flame probe for sensing the flame of the burner. The ignition component and the flame detector are fixedly arranged on the bottom plate of the combustion space.

With regard to the structure of the steam generating body 50, reference may be made to the description of the chinese patent application with the application number 202281118.6 entitled "novel through-flow steam generator or steam boiler and heat exchange unit thereof" filed by the applicant at 24.01/2022, and the repeated description is not repeated.

In order to realize the automatic control operation of the equipment, the steam generating equipment comprises: and a controller. The steam generating body 5050 is further provided with a liquid level gauge to obtain the water level of the steam generating body 5050. The controller is electrically connected to the second water pump 40 and the liquid level measuring device. The controller controls the first and second water pumps 10 and 40 according to the water level detected by the liquid level measurer. The water level of the steam generating body 50 can be monitored in real time by the liquid level measurer.

The liquid level measuring device 36 for a steam generating apparatus is a double tube type measuring device. Specifically, the liquid level measurer 36 includes: a first measuring assembly 1 and a second measuring assembly 2.

The first measuring assembly 1 comprises: a first measuring tube 5 and a level gauge 70 for detecting the level of liquid inside said first measuring tube 5; the first measuring tube 5 has a first upper end 11 and a first lower end 12 below the first upper end 11; the first measuring tube 5 is further provided with an upper communicating structure 15 near the first upper end 11 and a lower communicating structure 16 near the first lower end 12; the upper communication structure 15 and the lower communication structure 16 are used for communicating the first measuring pipe 5 with the steam generating body 50 for generating steam. Go up connectivity 15 and connectivity 16 intercommunication first survey buret 5 and the not co-altitude position of the steam generation body 50 that is used for steam generation, realize the intercommunication ware formula intercommunication of first survey buret 5 and steam generation body 50, the liquid level in the first survey buret 5 can keep unanimous with the inside liquid level of steam generation body 50 in real time.

The second measuring assembly 2 comprises: a second measuring pipe 6 and a detecting piece for detecting the liquid level inside the second measuring pipe 6; the second measuring pipe 6 is provided with at least one connection which connects the second measuring pipe 6 to the first measuring pipe 5. The at least one communication is located below an intermediate height position between the upper and

lower communication structures

15, 16. The second measuring component 2 is used for detecting the low liquid level condition of the steam generating body 50, and is indirectly communicated with the steam generating body 50 by virtue of the first measuring component 1.

The liquid level measuring device of the embodiment reduces the position of at least one communicating part (all communicating parts) so as to reduce the water volume entering the second measuring assembly 2, thereby reducing the pressure-bearing water volume of the steam generating equipment and being convenient for reaching the inspection-free standard. In addition, by reducing the position of the communication portion, the length of the pipe section required by the second measuring assembly 2 is low, which is beneficial to reducing the manufacturing cost.

Further, the second measurement pipe 6 is provided with two communicating parts that communicate the second measurement pipe 6 with the first measurement pipe 5: the upper communicating part and the lower communicating part are positioned below the upper communicating part. The upper and lower communicating portions are located below a middle height position between the upper communicating structure and the lower communicating structure and above the lower communicating structure.

And, the liquid level measurement ware of this embodiment can carry out low water level monitoring through the low water level monitoring of second measuring component 2 through the steam water level of first measuring component 1 real-time supervision through the dual water level monitoring structure that sets up first measuring component 1 and second measuring component 2, promotes the factor of safety of low water level warning, ensures steam boiler's safety in utilization.

In the steam generating device shown in fig. 2, the steam generating device has an upper header 58 and a lower header 57. The heat exchange unit is installed between the upper header 58 and the lower header 57. The heat exchange unit is provided with a plurality of vertical heat exchange tubes which are arranged in parallel along the circumferential direction, and the upper ends and the lower ends of the plurality of heat exchange tubes are respectively communicated with the upper header 58 and the lower header 57. The upper end of the vertical heat exchange tube is led into the upper header 58, and the upper communicating structure 15 is led into the upper header 58 of the steam generating equipment, so that air is exhausted into the upper header 58 when water enters the inside of the steam generating equipment, and air blockage in the first measuring tube 5 is avoided. The lower communicating structure 16 is communicated with the vertical heat exchange tube or the lower header 57, and the lower communicating structure 16 is used for supplementing water into the first measuring tube 5 and communicating the heat exchange units.

The specific communication positions of the upper and

lower communication structures

15 and 16 and the steam generating body 50 are not limited, and the first measuring assembly 1 can be communicated with the heat exchange unit of the steam generating body 50 through the upper and lower communication structures 16 in a communicating vessel mode.

In the present embodiment, the second measuring tube 6 has a second upper end 25 and a second lower end 26 located below said second upper end 25. One of the first upper end 11 and said first lower end 12 is a stopper end, the other one being inserted with a level gauge 70. One of the second upper end 25 and said second lower end 26 is blocked and the other is inserted into the detecting member (not shown). The level gauge 70 can be inserted into the first measuring pipe 5 from the first upper end 11 or the first lower end 12, the level gauge 70 in this embodiment being inserted into said first measuring pipe 5 from said first lower end 12 upwards.

The liquid level gauge 70 is a drop-in type capacitance liquid level gauge, and the detection member is a liquid level probe. The capacitive level gauge and the level probe are inserted into the first measuring tube 5 and the second measuring tube 6, respectively. The gauge 70 is longer than the detecting member, and the respective tube bodies have lengths substantially equal to those of the first measuring tube 5 and the second measuring tube 6. The liquid level meter 70 can measure and monitor the liquid level in the first measuring pipe 5 in real time. The detector element (level probe) can measure the lowest liquid level (predetermined level) in the second measuring tube 6. For example: when the liquid level of surveying buret 6 at the second exceeded minimum liquid level, it keeps switching on to detect the piece by the submergence, it surpasss minimum liquid level to show steam generation equipment's liquid level, and then do not carry out extremely low liquid level warning, and when the liquid level of surveying buret 6 at the second was less than minimum liquid level, the liquid level was less than the detection piece, the detection piece exposes the disconnection (cuts off and switches on) from the aquatic, send corresponding signal of telecommunication and show that steam generation equipment's liquid level is less than minimum liquid level, the controller received this corresponding alarm module of signal of telecommunication control and carries out extremely low liquid level warning, avoid dry combustion method.

The portion of the level gauge 70 inserted into the first measurement pipe 5 has a diameter of 10-25mm, and further, 15-19mm. The diameter of the portion of the detecting member inserted into the second measuring pipe 6 is 3.0 to 6.5mm, and further, the diameter is 4.0 to 5.0mm.

In order to avoid liquid accumulation in the first measuring tube 5 and waste liquid formation, the first measuring tube 5 is further provided with a drainage structure 49 in communication with the lower communication structure 16. The test element in this embodiment is inserted from the second upper end 25 down into the second measuring tube 6. The first measurement duct 5 extends downwardly beyond the lower communication structure 16 and communicates with a sewage drain structure 49 between its lower port and the lower communication structure 16. The sewage draining structure 49 comprises a sewage draining pipe vertically communicated with the first measuring pipe 5, and a sewage draining valve is arranged on the sewage draining pipe.

The second measuring tube 6 is further provided with at least one communication portion communicating the second measuring tube 6 with the first measuring tube 5. At least one communication portion (21, 22) is located below an intermediate height position between the upper and

lower communication structures

15, 16. To avoid liquid entrapment, at least one communication is located above the lower communication structure 16. All the communication portions are located below the intermediate height position between the upper communication structure 15 and the lower communication structure 16. In fig. 3, the AA line is taken as an identification line of the intermediate height position between the upper and lower communicating

structures

15 and 16, that is, two communicating portions are located below the AA height line.

The upper and lower connections are located below an intermediate height between the upper connection 15 and the lower connection 16, i.e. the second measuring tube 6 is connected to the first measuring tube 5 only by means of connections, while the section above the upper connection is spaced apart from the first measuring tube 5. By reducing the height of the connections, the length of the second measurement pipe 6 can likewise be reduced, said second measurement pipe 6 being located, in the present embodiment, below an intermediate height position between the upper 15 and lower 16 communicating structures (intermediate position therebetween).

Specifically, in order to reduce the occupied water volume, the vertical projection length of the second measurement pipe 6 in the extending direction of the first measurement pipe 5 is less than half of the first measurement pipe 5, and further, the vertical projection length of the second measurement pipe 6 is less than half of the distance between the upper communicating structure 15 and the lower communicating structure 16; furthermore, the second measuring tube 6 has a vertically projected length which is less than one third of the distance between the upper and lower communicating

structures

15, 16.

In the present embodiment, the first measurement pipe 5 and the second measurement pipe 6 are both straight pipes. The second measuring tube 6 is arranged parallel to the first measuring tube 5. The second measuring tube 6 and the first measuring tube 5 extend vertically in parallel, and accordingly the perpendicular projection length of the second measuring tube 6 in the direction of extension of the first measuring tube 5 is also the length of the second measuring tube 6 itself (vertical extension length). In order to reduce the water volume occupied by the level meter, the inner diameter of the second measuring tube is smaller than the inner diameter of the first measuring tube. Specifically, the inner diameter of the second measuring tube is 20-35mm, and the inner diameter of the first measuring tube is 40-60mm. Further, the inner diameter of the second measuring pipe is 25-30mm, and the inner diameter of the first measuring pipe is 42-50mm.

In this embodiment, the upper communication structure 15 includes an upper mouthpiece vertically communicating with the first measurement pipe 5 and a connecting flange fixedly disposed at a pipe end of the upper mouthpiece. The lower communicating structure 16 comprises a lower interface pipe vertically communicated with the first measuring pipe 5 and a connecting flange fixedly arranged at the pipe end of the lower upper interface pipe. The upper communicating structure 15 is close to the first upper end 11, the distance between the upper communicating structure and the first upper end 11 is about 100mm (+ -20 mm), the first upper end 11 is plugged by a plug, and the first lower end 12 can be inserted into a liquid level meter 70 to detect the liquid level in the first measuring pipe 5. The first survey buret 5 through upper and

lower intercommunication structure

15, 16, can keep with the intercommunication of heat transfer unit (heat exchange tube), through the principle of linker, its inside liquid level reflects heat transfer unit's liquid level in real time, measures the liquid level in the first survey buret 5 through level gauge 70 and can learn the liquid level in the steam generation body 50 to control the operation of first water pump 10, second water pump 40.

The at least one communicating portion includes an upper communicating pipe 21 (upper communicating portion) communicating the first measuring pipe 5 and the second measuring pipe 6, and a lower communicating pipe 22 (lower communicating portion) communicating the first measuring pipe 5 and the second measuring pipe 6. The upper communication tube 21 is adjacent to the second upper end 25, and the lower communication tube 26 is adjacent to the second lower end 26. At this time, the number of the communicating portions is two, the lower communicating pipe 22 feeds water into the first measuring pipe 5, and the upper communicating pipe 21 exhausts air to avoid air blockage. The upper communicating pipe 21 and the lower communicating pipe 22 are parallel and vertically communicated with the first measuring pipe 5. The upper communicating pipe 21 and the lower communicating pipe 22 are both located below the middle height position (AA height line) and above the lower communicating structure 16. The distance between the upper communicating pipe 21 and the lower communicating pipe 22 is less than one fourth of the distance between the upper communicating structure 15 and the lower communicating structure 16.

For example, the pitch L1 between the upper communication structure 15 and the lower communication structure 16 is 400mm or more and 1000mm or less. The distance L3 between the upper communication pipe 21 and the lower communication pipe 22 is 40mm or more and 250mm or less. The length L2 of the second measurement pipe 6 is above 80mm and below 300 mm; the inner diameter D of the upper communication pipe 21 is 10mm or more. The length L4 of the upper communication pipe 21 is 40mm or more, and more specifically, the length L4 of the upper communication pipe 21 is 60mm or more.

Bearing in mind the above, the lower end (second lower end 26) of the second measurement pipe 6 is a plugged end, and the upper and

lower communication tubes

21, 22 are located between the second upper end 25 and the second lower end 26. The second measuring tube 6 is integrally a vertical tube section. In other possible embodiments, the lower end of the second measurement duct 6 may communicate directly with the downcomer 22, for example, the downcomer 22 communicates with the lower end of the second measurement duct 6 via a 90 degree elbow joint.

In the present embodiment, the first measurement pipe 5 and the level gauge 70 constitute the first measurement assembly 1 of the steam generating body 50. The second measuring tube 6 and the detector element constitute a second measuring unit 2 which is used to monitor the low liquid level and to emit an alarm signal, for example, if the level is below a certain level the detector element is switched on and emits a low liquid level alarm signal, and the machine is shut down. Under the normal operating condition, the second is surveyed buret 6 and is full liquid level state, through last communicating pipe 21 with inside gas outgoing, avoid holding back breath and can't advance water and lead to the wrong report alert.

The second measuring assembly 2 constitutes a complement to the first measuring assembly 1, both constituting a double monitoring of low liquid levels. The second measuring component 2 depends on the lower communicating pipe 22 to inwardly intake water, and outwards exhaust through the upper communicating pipe 21, and then the liquid level can keep linking with the second survey buret 6, carries out low liquid level monitoring in real time, and especially the second measuring component 2 can effectively monitor the possible condition that low liquid level takes place under the condition that first measuring component 1 became invalid, carries out low liquid level warning, avoids the boiler dry combustion method.

In one possible embodiment, another second measuring assembly 2' is proposed as shown in fig. 7. The second measuring tube 6 is an inclined tube, the lower end of which is directly communicated with the first measuring tube 5, and the upper end of which is an open end and is inserted with a detection piece. In the present embodiment, the number of the communicating portions is 1, which is the lower end of the second measurement pipe 6, integrally with the second measurement pipe 6. The length of the inclined tube is less than half of the length of the first measuring tube 5, so that the water volume can be reduced. The upper end of the inclined tube type second measuring component 2' is inserted into the detecting piece and is blocked by the detecting piece.

Further research shows that although the measuring assembly shown in fig. 7 can reduce the water volume, the problem of air blockage occurs at a certain probability in the water supplementing process, and along with the increase of the water level, the upper end of the inclined tube type second measuring tube 6 is blocked by the detected piece, the gas in the inclined tube type second measuring tube cannot be discharged, the water level cannot be consistent with the first measuring tube 5, water cannot be supplemented, and the problem of false alarm of low water level occurs. In order to avoid the above problems, the present disclosure provides the liquid level measuring device of the above embodiment as shown in fig. 1 to 6, which is not described herein again.

Bearing the above description, when the second water pump 40 communicates in the low reaches of heat exchanger 20, heat exchanger 20 preheats cold water, the temperature of water after preheating can reach more than 70 degrees or 80 degrees, this just makes aquatic gas precipitate even gasification produces a large amount of gas and flows together, research discovery, gas gathers in second water pump 40 department easily and forms the bubble air pocket, not only forms the cavitation erosion problem, influences the life of pump, can reduce second water pump 40 pump efficiency moreover, can't in time supply water to the furnace body, lead to the furnace body liquid level unstability, can't produce vapour steadily. Although a vent valve 45 may be integrated into the second water pump 40, there may still be instances of untimely venting in situations where large amounts of gas are being generated.

In order to avoid the above problem, in this embodiment, a buffer container 30 having a water containing space therein is further communicated between the water inlet end of the heat exchanger 20 and the water inlet end of the second water pump 40. The warm water enters the water containing space to be gathered and slowly flowed, and the gas is separated out to avoid entering the second water pump 40. Wherein, the buffer container 30 is further provided with a communicating structure for communicating the water containing space with the outside at least when the water level inside the buffer container is lower than a preset water level. This communicating structure has a function of exhausting air, and therefore, may be referred to as an exhaust structure. The water containing space provides a containing space for water after heat exchange or heat exchange with the flue gas, and correspondingly, separated gas is gathered and released in the water containing space. In addition, due to the existence of the communication structure, when the water level is not higher than a certain level (for example, water is not fully stored), a gas releasing and gathering space can be always arranged above the liquid level, and the gas is discharged. The buffer container 30 and the heat exchanger 20 are both communicated with the downstream of the first water pump 10, and the pressure head of the first water pump 10 is smaller than 1Bar, so that the heat exchanger 20 and the buffer container 30 are not pressure-bearing.

More preferably, this connectivity structure keeps when the water level is low and outside intercommunication, for normally opening the structure, and then need not opening pressure to gaseous release, separates out and can outwards escape, and then even be applied to the great scene of tolerance separation out, still can not have gaseous entering second water pump 40 and lead to idle running, the problem of moisturizing difficulty.

In the present embodiment, the buffer container 30 is communicated with the upstream of the second water pump 40 and the downstream of the heat exchanger 20, that is, the buffer container 30 is communicated between the water inlet end of the second water pump 40 and the water inlet end of the heat exchanger 20. The communicating structure is communicated with the outside atmosphere at least when the water level in the water containing space is lower than the preset water level. The communicating structure may communicate with other vessels than the buffer vessel 30, such as a gas collecting vessel, a drain line, or directly communicate with the atmosphere. The communication structure is closed when the internal water level of the water containing volume 32 is higher than a preset water level. The preset water level can be more than 50% of the water containing space, or 70% or 100% of the water containing space, for example, when the water is full, the communication structure is closed to form a closed water containing space. As the pressure inside the water containing space increases by the suction of the second water pump 40 and the gas evolution, the water level of the water containing space gradually decreases until the communicating structure (automatic exhaust valve) is reopened.

In other embodiments, the communication structure may also remain in communication with the exterior, i.e., even above the preset water level, the communication structure may also be in communication with the exterior. For example, the communication structure is a communication hole communicating with the atmosphere, which is provided at an upper portion (e.g., a top portion) of the buffer container 30 and overflows to the outside when the buffer container is filled with water, but the exhaust hole may communicate with a drain pipe to drain the overflowing water.

In this embodiment, the buffer container 30 is a tank structure, and the storage of the buffer container stores warm water after heat exchange or heat exchange with flue gas, so as to avoid heat dissipation, and further the buffer container 30 is externally provided with a heat preservation measure. The volume of the buffer container 30 is between 1L and 500L, and further, the volume of the buffer container 30 is between 20L and 50L.

The communicating structure is configured to communicate with the atmosphere when the water level is below a predetermined water level and to be disconnected from the atmosphere when above the predetermined water level. It can be understood that, when the buffer container 30 is in the no-water state or the little-water state, the communicating structure is opened, and at this time, in the process of inputting water into the buffer container, the communicating structure is kept in the opened state, so that gas can escape without pressure, the gas content of the entering water in the second water pump 40 is reduced, and the hidden trouble that the second water pump 40 can not supply water due to idling is eliminated.

The communicating structure is a normally open type exhaust valve 35 (e.g., a normally open type automatic exhaust valve) disposed at an upper end of the buffer container 30. The communicating structure is located at a position more than 70% of the height from the inner bottom surface of the buffer container 30. As shown in fig. 3, the vent valve 35 is installed at the top of the buffer container 30, and the vent valve 35 may be provided with a float linked with the plugging valve core, and when the liquid level rises to a predetermined liquid level (water level), the float floats to drive the plugging valve core to close the vent valve 35, thereby preventing the buffer container 30 from overflowing outwards. The second water pump 40 is communicated with the buffer container 30, water in the buffer container 30 is pumped by the second water pump 40, and the risk of idle cavitation caused by large air flow of the second water pump 40 can also be avoided.

Of course, in order to avoid water leakage due to excessive water inflow, the communication structure preferably employs a normally open type automatic exhaust valve 35.

In this embodiment, the input interface (water inlet end) of the buffer container 30 communicated with the heat exchanger is higher than the output interface (output end) communicated with the second water pump 40. This further prevents the second water pump 40 from being unable to pump water. The output end (water outlet end) of the buffer container 30 is near or disposed at the bottom thereof, for example, the water outlet end thereof is lower than the height position of 50% of the water containing space (relative to the bottom surface of the water containing space). In order to facilitate cleaning of the buffer container 30, the bottom of the buffer container 30 is also communicated with a pollution discharge structure capable of controlling the switch. The drain structure may include a drain line and a drain valve disposed on the drain line.

The buffer container 30 is also provided with a water level detecting gauge such as a water level probe. The water level detector is disposed at the top of the buffer container 30 to detect whether water or liquid level exists in the buffer container 30. When the boiler (the steam generating body 50) is in water shortage and gives an alarm, whether the buffer container 30 is conducted or not is detected through the water level detector, if the water level in the buffer container 30 is detected to reach the standard (the water level reaches a first preset water level such as 60 percent of water level), the first water pump 10 and the second water pump 40 are started to operate simultaneously, and the first water pump 10 and the second water pump 40 operate simultaneously to supplement water into the steam generating body 50. If the water level detecting meter detects that the buffer container 30 is lack of water, the first water pump 10 is started to supplement water into the buffer container 30, idle rotation of the second water pump 40 is avoided, the water level detecting meter is conducted when the water supplement reaches a certain liquid level in the buffer container 30, the second water pump 40 is started again, and at the moment, the first water pump 10 and the second water pump 40 run simultaneously to supplement water into the steam generating body 50.

The first water pump 10 has a small lift (head) and a flow rate greater than that of the second water pump 40, and the two pumps can keep a water replenishing state in the buffer container 30 when operating simultaneously until the communicating structure is closed, and the flow rate of the first water pump 10 can be suppressed due to the existence of fluid back pressure. Along with the gas separation, the water level in the buffer container 30 will continuously drop until the communicating structure is opened again, and in the process, the second water pump 40 can continuously and stably suck the warm water of the separated gas, so that the problem that water cannot be supplemented due to idling is avoided. In a state where the communication structure is opened or the water containing space (water containing exhaust space) is communicated with the outside, the flow rate of the first water pump 10 is greater than the flow rate of the second water pump 40.

In this embodiment, the steam generating device is further provided with a controller electrically connected to the water level detector, the first water pump 10 and the second water pump 40. The controller starts the first water pump 10 to replenish water into the buffer container 30 when the water level (initial water level in the state where the dual pump is not started) in the buffer container 30 is lower than a second predetermined water level (buffer container water replenishing water level, small pump start water level). In the moisturizing mode, through moisturizing in to buffer container 30 earlier, reach certain liquid level after rethread second water pump 40 moisturizing in to steam generation body 50, preheated water has carried out the slow flow through buffer container 30 and has been discharged, and then avoids the problem of unable moisturizing.

The controller is configured to start the second water pump 40 to replenish water into the steam generating body 50 when the water level of the steam generating body 50 (the initial water level in the non-activated state of the dual pump) is lower than the water replenishing water level (the water replenishing water level of the steam generating body) and the water level in the buffer container 30 is higher than a first predetermined water level (a large pump activation water level).

Further, when the water level of the steam generating body 50 is lower than the water replenishing level (which can be measured by the level meter 36) and the water level in the buffer container 30 is higher than the first predetermined water level (the large pump start water level), the second water pump 40 and the first water pump 10 are simultaneously started to replenish water into the steam generating body 50.

Moreover, when water is supplied to the steam generating body 50, the second water pump 40 is always in a starting state, so that the problem that water cannot be smoothly supplied to the furnace body by a small pump only due to the pressure of an external pipeline connected with the furnace body when a plurality of machines work in parallel can be avoided. The control logic of the controller is simple, the second water pump 40 does not need to judge the intervention opportunity, and only the buffer container 30 needs to meet the water level in the water supplementing mode, that is, the second water pump 40 (big pump) is relied on in the embodiment to supplement water to the steam generating body 50.

Steam generation equipment in this embodiment relies on setting up buffer container 30 between first water pump 10 and second water pump 40, avoids directly establishing ties the double pump and do not have the buffering, through buffer container 30 with middle rivers buffering, directly influences first water pump 10 when avoiding second water pump 40 to start, consequently, can effectively avoid first water pump 10 and second water pump 40 because of the two instantaneous head, the big pump evacuation that leads to of flow difference, the problem of moisturizing failure.

In this embodiment, the first predetermined level is greater than or equal to the second predetermined level. Preferably, the first predetermined water level is equal to the second predetermined water level, that is, the controller starts the first and second water pumps 10 and 40 to supplement water to the steam generating body 50 when the water level in the buffer container 30 is higher than the first predetermined water level. The controller starts the first water pump 10 to supplement water into the buffer container 30 when the water level in the buffer container 30 is lower than a first preset water level, and starts the second water pump 40 when the water level reaches the first preset water level, and the first water pump 10 and the second water pump 10 operate simultaneously to supplement water to the steam generating body 50.

Under the condition that the first preset water level is higher than the second preset water level, the controller starts the second water pump 40 to supplement water to the steam generation body 50 when the water level in the buffer container 30 is higher than the first preset water level, starts the first water level 10 to supplement water to the buffer container 30 when the water level is reduced to the second preset water level, and simultaneously operates the first water pump 10 and the second water pump 40 to supplement water to the steam generation body 50. The first water pump and the second water pump can be started simultaneously under the condition that the water level in the buffer container 30 is between the first preset water level and the second preset water level, or the first water level is started independently, or the second water pump is started independently.

The controller is further configured to start the first water pump 10 to replenish water into the buffer container 30 when the water level of the steam generating body 50 (obtained by the liquid level measurer 36) is lower than the water replenishing water level (entering the water replenishing mode) and the water level in the buffer container 30 is lower than a second predetermined water level, and start the second water pump 40 to replenish water into the steam generating body 50 when the water level in the buffer container 30 reaches the first predetermined water level. Specifically, the first predetermined water level and the second predetermined water level may be above the maximum water level of the 50% water containing space.

Bearing in mind the above description, in the present embodiment, the second heat exchange assembly is a condensing heat exchanger 20 for recovering the residual heat of the flue gas at the flue gas output end of the steam generating body 50. The first fluid flow path comprises an internal flow path of a condensing heat exchange tube in the condensing heat exchanger 20, and the second flue gas flow path is defined in the interior of the shell of the condensing heat exchanger 20 and is positioned between the condensing heat exchange tube and the shell of the condensing heat exchanger 20. The condensing heat exchanger 20 is communicated with a first water pump 10 for driving the fluid to flow. The first water pump 10 is connected in series between the water inlet connection (the water inlet end of the device) and the water inlet end (the first water inlet end) of the first fluid flow path. The shell 21 of the condensing heat exchanger 20 has a flue gas inlet (flue gas input) which is communicated with a flue gas output 55 of the steam generating body 50. The top of the shell 21 of the condensing heat exchanger 20 is provided with a smoke outlet (smoke output). The condensing heat exchanger 20 has a first water inlet end and a first water outlet end, with a plurality of condensing heat exchange tubes defined therebetween in series or in parallel. The first water inlet end is communicated with the water outlet end of the first water pump 10 through a first pipeline, and the water inlet end of the first water pump 10 is communicated with a water inlet connector to input external cold water.

In the present embodiment, the buffer container 30 is a buffer water storage tank communicated with the upstream of the second water pump 40 and the downstream of the heat exchanger 20. The height of the buffer water storage tank 30 is lower than that of the condensing heat exchanger 20, and the buffer water storage tank 30 is disposed below the condensing heat exchanger 20. The height of the buffer water storage tank 30 is more than 0.2m and less than 1.5 m; the cross-sectional area of the water containing space of the buffer water storage tank 30 is more than 100 square centimeters. For example, the water-containing space of the buffer container 30 is a cylindrical cavity with a diameter of 100-300mm and a height of about 500mm (+ -100 mm).

The water inlet end of the second water pump 40 is communicated with the water outlet end (water outlet port) of the buffer water storage tank 30 through a second pipeline, and the water inlet end of the buffer water storage tank 30 is communicated with the first water outlet end of the heat exchanger 20 through a pipeline. The water outlet end of the second water pump 40 is communicated with the water inlet end of the steam generating body 50 through a third pipeline. The water inlet end of the body is arranged at the bottom of the steam generating body 50 and communicated with the lower header. The steam output end is arranged at the top of the steam generating body 50 and communicated with the upper header. The flue gas output end is arranged on the side wall of the steam generating body 50, forms a flue gas outlet and is fixedly connected with the flue gas inlet of the heat exchanger 20 through a flange. A drain pipe is further provided at the bottom of the lower header of the steam generating body 50.

In order to further avoid the problem of gas separation, the steam generating equipment also comprises a communicating structure communicated with the upstream of the water inlet end of the body. The communication structure is located between the water inlet end of the steam generating body 50 and the water inlet end of the heat exchanger 20. In one embodiment, the communicating structure is activated when the internal gas pressure exceeds the external gas pressure by a predetermined difference (activation pressure difference) to discharge the internal gas and prevent the gas from being supplied to the furnace body. Specifically, the communication structure includes an automatic exhaust valve (a normally closed exhaust valve) integrated in the second water pump 40. The starting pressure difference of the automatic exhaust valve 35 is 0.1mPa to 1mPa, so that internal gas accumulation is avoided, and cavitation of the second water pump 40 is reduced.

Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges are inclusive of the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the indicated endpoints.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of 8230comprises the elements, components or steps identified and other elements, components or steps which do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the attributes described that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed inventive subject matter.

Claims

1. A liquid level gauge for a steam generating apparatus, the liquid level gauge comprising:

2. The fluid level gauge of claim 1, wherein the upper and lower communication portions are located above the lower communication structure; the second measurement pipe is located below a mid-height position between the upper and lower communicating portions.

3. The fluid level gauge of claim 1, wherein one of the first upper end and the first lower end is a blocking end, and the other is inserted with a fluid level gauge; the second measurement pipe having a second upper end and a second lower end below the second upper end; one of the second upper end and the second lower end is blocked, and the other end is inserted into a detection piece;

the upper communication structure comprises an upper mouthpiece which is vertically communicated with the first measuring pipe and a connecting flange which is fixedly arranged at the pipe end of the upper mouthpiece; the lower communicating structure comprises a lower interface pipe and a connecting flange, wherein the lower interface pipe is vertically communicated with the first measuring pipe, and the connecting flange is fixedly arranged at the end of the lower upper interface pipe.

4. The fluid level gauge of claim 3, wherein the fluid level gauge is inserted upwardly into the first measuring tube from the first lower end; the detecting piece is inserted into the second measuring pipe from the second upper end downwards.

5. A liquid level gauge as defined in claim 1, wherein a perpendicular projection length of the second measuring tube in a direction of extension of the first measuring tube is less than half of the length of the first measuring tube.

6. The fluid level gauge of claim 5, wherein the second measurement tube has a perpendicular projection length less than half of the spacing between the upper and lower communicating structures.

7. The fluid level gauge of claim 5, wherein the second measurement duct has a perpendicular projection length less than one third of the distance between the upper and lower communicating structures.

8. The liquid level gauge of claim 5, wherein the second measuring tube is disposed parallel to the first measuring tube; the second measuring tube has an inner diameter of 20-35mm, and the first measuring tube has an inner diameter of 40-60mm.

9. A liquid level gauge as claimed in claim 8, wherein the second measuring tube has an inner diameter of 25-30mm and the first measuring tube has an inner diameter of 42-50mm.

10. The liquid level measurer as claimed in claim 1, wherein the upper communication part comprises an upper communication pipe communicating the first measuring pipe and the second measuring pipe; the lower communicating part comprises a lower communicating pipe which communicates the first measuring pipe and the second measuring pipe; the distance between the upper communicating pipe and the lower communicating pipe is less than one fourth of the distance between the upper communicating structure and the lower communicating structure.

11. The fluid level gauge of claim 1, wherein the fluid level gauge is a capacitive fluid level gauge; the detection piece is a liquid level probe.

12. The liquid level measurer as claimed in claim 10, wherein the upper communicating tube and the lower communicating tube are parallel and vertically communicate the first measuring tube and the second measuring tube;

the length of the first measuring tube is more than 400mm and less than 1000 mm; the length of the second measurement pipe is more than 80mm and less than 300 mm; the distance between the upper communicating pipe and the lower communicating pipe is more than 40mm and less than 250 mm; the inner diameter of the upper communicating pipe is more than 10 mm; the length of the upper communicating pipe is more than 40 mm.

13. The liquid level measurer as claimed in claim 12, wherein the length of the upper communicating pipe is more than 60mm.

14. The fluid level gauge as claimed in claim 10, wherein said downcomer communicates with the lower end of said second gauge tube through a 90 degree elbow joint; the first measuring pipe is arranged below the lower communicating part and is also communicated with a sewage discharge structure.

15. A steam generating apparatus, comprising:

a steam generating body for generating steam, having an upper header, a lower header, and a heat exchange unit between the upper header and the lower header; the heat exchange unit comprises a plurality of vertical heat exchange tubes which are arranged along the circumferential direction;

a liquid level gauge as claimed in any one of claims 1 to 14; the liquid level measurer is communicated with different height positions of the steam generating body through an upper communicating structure and a lower communicating structure.