CN115614722A

CN115614722A - Steam generating plant and method for operating the same

Info

Publication number: CN115614722A
Application number: CN202211262740.3A
Authority: CN
Inventors: 朱高涛; 段毅
Original assignee: Anhui Hot Well Energy Saving Technology Co ltd
Current assignee: Anhui Rejing Boiler Co ltd
Priority date: 2022-09-15
Filing date: 2022-10-15
Publication date: 2023-01-17
Anticipated expiration: 2042-10-15
Also published as: CN115614722B; CN218914889U

Abstract

Disclosed are a steam generating apparatus and an operating method thereof, the steam generating apparatus including: the first water pump, the heat exchanger, the second water pump and the steam generating body are communicated in series; the water flow sequentially flows through the first water pump, the heat exchanger and the second water pump to enter the steam generation body; the steam generating body is provided with a steam output end for outputting steam and a flue gas output end for outputting flue gas; a flue gas flow passage of the heat exchanger is communicated with the flue gas output end; the lift of the first water pump is smaller than that of the second water pump and larger than the water resistance of the heat exchanger; and a buffer container with a water containing space inside is communicated between the water inlet end of the heat exchanger and the water inlet end of the second water pump, and the buffer container is also provided with a communicating structure which communicates the water containing space with the outside at least when the water level inside the buffer container is lower than a preset water level.

Description

Steam generating plant and method for operating the same

Cross reference to related citations

The present application claims priority from chinese patent application No. 202211125202.X entitled "steam generating apparatus" filed on 9/15/2022, the entire contents of which are incorporated herein by reference.

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

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Under the call of national energy conservation and emission reduction, the steam generating equipment accelerates the development to 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 generally exceeds the standard, and particularly after the 2020-version boiler regulation 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 the whole pressure-bearing space from an outlet of a feed pump to a steam outlet of equipment is determined.

In order to solve the above problems, the applicant filed an invention patent application with application number 2008650411 named as a steam generation device and an operation method thereof on 21/7/2022. However, the following problems are found during use:

1. the double pumps are directly connected in series, bubbles are generated in water after the condenser (condensing heat exchanger) is heated, although an exhaust valve is arranged on a booster pump of the steam generating equipment in a matching way, the problem that the bubbles cannot be removed in time exists under the condition of large air quantity, and water replenishing is difficult;

2. the double pumps are directly connected in series, so that the instantaneous lift and the flow difference are large, the large pump is easy to pump vacuum, and the water replenishing fails;

3. the water supplement logic of the double-pump scheme has the defect that when multiple machines work in parallel and the external pipeline connected with the furnace body has pressure, water cannot be smoothly supplemented into the furnace body by only using a small pump, a large pump is required to do work together for water supplement, but the intervention time of the large pump cannot be judged.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions in the present specification and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present specification.

Disclosure of Invention

In view of the above problems, an object of the present disclosure is to provide a steam generating apparatus or a control method of a steam generating apparatus, so as to solve at least one of the above problems, not only ensure the utilization rate of the combustion heat of the gas, but also avoid affecting the steam generating speed and the evaporation capacity of the steam generator on the basis of improving the water volume and realizing real safety and no detection.

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

a steam generating apparatus comprising: the first water pump, the heat exchanger, the second water pump and the steam generating body are sequentially communicated in series; the water flow sequentially flows through the first water pump, the heat exchanger and the second water pump and enters the steam generation body; the steam generating body is provided with a steam output end for outputting steam and a flue gas output end for outputting flue gas;

a flue gas flow passage of the heat exchanger is communicated with the flue gas output end; the lift of the first water pump is smaller than that of the second water pump and larger than the water resistance of the heat exchanger;

and a buffer container with a water containing space inside is communicated between the water inlet end of the heat exchanger and the water inlet end of the second water pump.

As a preferred embodiment, the buffer container is further provided with a communication structure for communicating the water containing space with the outside when the water level inside the buffer container is at least lower than a preset water level.

As a preferred embodiment, the buffer container is further provided with a communication structure which communicates with the outside when the internal pressure thereof is greater than the first pump head.

As a preferred embodiment, the communicating structure communicates with the outside atmosphere when the water level inside the water containing space is lower than a preset water level.

In a preferred embodiment, the buffer container is a buffer water storage tank communicated with the upstream of the second water pump and the downstream of the heat exchanger.

As a preferred embodiment, the volume of the buffer container is between 1L and 500L, and further, the volume of the buffer container is between 20L and 50L.

As a preferred embodiment, the communication structure is configured to communicate with the outside atmosphere when the water level is below a predetermined level and to be disconnected from the outside atmosphere when above the predetermined level.

In a preferred embodiment, the communication structure is a normally open automatic exhaust valve provided in an upper portion of the buffer container.

In a preferred embodiment, the communication structure is a communication hole provided in an upper portion of the buffer container.

In a preferred embodiment, the communicating structure is located at a position more than 50% of the height from the inner bottom surface of the buffer container.

As a preferred embodiment, the buffer vessel is integrated in the heat exchanger; the heat exchanger comprises a heat exchanger shell and a flue gas pipeline which is arranged in the heat exchanger shell in a penetrating way; and a water containing space of the buffer container is formed between the heat exchanger shell and the flue gas pipeline.

As a preferred embodiment, the bottom of the buffer container is also communicated with a pollution discharge structure capable of controlling the switch.

As a preferred embodiment, the buffer container is further provided with at least one water level detecting meter;

the steam generating equipment is also provided with a controller which is electrically connected with the water level detecting meter, the first water pump and the second water pump; the controller is used for starting the first water pump to replenish water into the buffer container under the condition that the water level in the buffer container is lower than a second preset water level.

As a preferred embodiment, the controller is further configured to start the second water pump to replenish water into the steam generating body when the water level of the steam generating body is lower than the water replenishing water level and the water level in the buffer container is higher than a first predetermined water level; the first predetermined water level is greater than or equal to a second predetermined water level.

As a preferred embodiment, the controller is further configured to simultaneously start the first water pump and the second water pump to replenish water into the steam generating body when the water level of the steam generating body is lower than the water replenishing water level and the water level in the buffer container is higher than a first predetermined water level; the first predetermined water level is greater than or equal to a second predetermined water level.

As a preferred embodiment, the controller is configured to start the first water pump to replenish water into the buffer container when the water level of the steam generating body is lower than the water replenishing water level and the water level in the buffer container is lower than a second predetermined water level, and start the second water pump to replenish water into the steam generating body when the water level of the buffer container reaches the first predetermined water level; the second predetermined water level is less than or equal to the first predetermined water level.

A relay heat transfer buffer for steam generating equipment comprises a first pump, a second pump and a steam generating body, wherein the first pump, the second pump and the steam generating body are sequentially connected in series; the steam generating body is provided with a steam output end for outputting steam and a flue gas output end for outputting flue gas;

the relay heat transfer buffer comprises a water flow space and a smoke flowing space which can exchange heat; the water flow space is used for being communicated between the first pump and the second pump; the flue gas input end of the flue gas flowing space is communicated with the flue gas output end;

the thermal heat transfer buffer is provided with a water containing space with the volume of 1L-500L at the downstream of the water inlet end of the water flow space and the upstream of the second pump, and preferably, the volume of the water containing space is 20L-50L.

As a preferred embodiment, the heat transfer buffer comprises a condensing heat exchanger with the water flow space and a flue gas flowing space, and a buffer water storage tank with the water containing space; and the water inlet end of the buffer water storage tank is communicated with the water outlet end of the condensation heat exchanger.

In a preferred embodiment, the height of the buffer water storage tank is more than 0.2m and less than 1.5 m; the cross-sectional area of the water containing space of the buffering water storage tank is more than 100 square centimeters.

As a preferred embodiment, the thermal heat transfer buffer comprises a heat exchange shell and a flue gas pipeline arranged in the heat exchange shell in a penetrating way; a water flow space is formed between the flue gas pipeline and the inner wall of the heat exchange shell; the water flow space constitutes the water containing space.

As a preferred embodiment, the buffer container is further provided with a communication structure for communicating the water containing space with the outside of the water containing space when the water level inside the buffer container is at least lower than a preset water level.

As a preferred embodiment, the buffer container is further provided with a communication structure that communicates with the outside when the internal pressure thereof is greater than a predetermined pressure such as the first pump head.

As a preferred embodiment, the communication structure is configured to communicate with the atmosphere when the water level is below a predetermined level and to be disconnected from the atmosphere when the water level is above the predetermined level.

In a preferred embodiment, the communication structure is a normally open automatic vent valve provided in an upper portion of the buffer container.

In a preferred embodiment, the bottom of the buffer container is also communicated with a pollution discharge structure capable of controlling opening and closing.

A steam generating apparatus comprising: the relay heat transfer buffer as described above.

Has the advantages that:

the steam generation equipment of this disclose an embodiment sets up the double pump operation, through at the leading first water pump of heat exchanger to offset the water resistance of heat exchanger, the second water pump of heat exchanger low reaches is arranged in to the back because the water resistance (the pipeline resistance) of heat exchanger offsets in order to be offset by first water pump when moving, and then the heat exchanger is less or even eliminates to the pump efficiency influence of second water pump, and then can in time supply water to steam generation body (furnace body) under the double pump effect, satisfies the requirement that steam generation body was to water level control.

And the heat exchanger is positioned at the upstream of the second water pump, a pressure-bearing design is not needed, and then the heat exchanger (an energy saver) does not belong to a pressure-bearing device, so that the pressure-bearing water volume can be better improved, the internal geometric volume of the steam generation equipment from the water outlet end of the second water pump to the steam output end of the steam generation body is below 30L, and the steam generation speed and the evaporation capacity of a steam generator or a steam boiler are prevented from being influenced on the basis of real safety and no inspection.

According to the operation method of the steam generation equipment disclosed by the embodiment of the disclosure, the idling of the second water pump (large pump) is avoided by controlling the starting and stopping of the double pumps, water is rapidly supplemented into the furnace body, the liquid level in the furnace body is maintained to be stable, and the steam generation equipment can stably and efficiently generate gas.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the 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 more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 diagram of a water circuit of a steam generating device according to the prior art;

FIG. 2 is a schematic water circuit diagram of a steam generation apparatus of one embodiment of the present disclosure;

FIG. 3 is a schematic view of the buffer container of FIG. 2;

FIG. 4 is a schematic illustration of a water circuit of a steam generating apparatus according to another embodiment of the present disclosure;

FIG. 5 is a schematic diagram of the relay heat transfer buffer of FIG. 4;

fig. 6 is a schematic structural view of a steam generating apparatus according to another embodiment of the present disclosure.

Detailed Description

In order to make those skilled in the art better understand the technical solutions of the present invention, 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 a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It will be understood that when an element is referred to as being "disposed 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 denote a single embodiment.

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. 2, one embodiment of the present disclosure provides a steam generating apparatus suitable for, but not limited to, a non-inspection steam generator or steam boiler having a water volume 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, the first heat exchange assembly is limited with a first flue gas runner and a first heat exchange assembly of a 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 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 of the preheating flow channel exchanges heat with the flue gas of the second flue gas flow channel to be heated. The preheating flow passage 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 communicate with a water inlet container. The water intake container may be provided by an external water tank, or may be provided by a water tower or tank 30a, although 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 body water inlet end, 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 can be a multi-stage centrifugal variable-frequency water pump so as to provide a large lift and form a pressure-bearing water path at the downstream of the pump. 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. 6, 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 member 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.

For the structure of the steam generating body 50, reference may be made to the description of the applicant in the chinese patent application with the application number 202281118.6 entitled "new type through-flow steam generator or steam boiler and its heat exchange unit" filed on 24.01.2022, and the repeated descriptions are omitted.

In order to realize the automatic control operation of the equipment, the steam generating equipment comprises: and a controller. The steam generating body 50 is further provided with a liquid level sensor to acquire the water level of the steam generating body 50. The controller is electrically connected with the second water pump 40 and the liquid level sensor. The controller controls the first and second water pumps 10 and 40 according to the water level detected by the water level sensor.

When the second water pump 40 communicates with the downstream of the heat exchanger 20, the heat exchanger 20 preheats cold water, and the preheated water temperature can reach 70 degrees or more than 80 degrees, so that gas in water is precipitated and even gasified to generate a large amount of gas to flow together, and researches find that the gas is easy to gather at the second water pump 40 to form a bubble air mass, thereby not only forming the cavitation problem and influencing the service life of the pump, but also reducing the pumping efficiency of the second water pump 40, and being incapable of supplying water to the furnace body in time, so that the liquid level of the furnace body is unstable and the gas cannot be stably produced. Although a vent valve 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 the present embodiment, a buffer container 30 having a water containing space 32 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 32 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 35 for communicating the water containing space 32 with the outside at least when the water level inside the buffer container is lower than a preset water level. The communicating structure 35 has a function of exhausting air, and therefore, may be referred to as an exhaust structure. The water containing space 32 provides a containing space for the water after heat exchange or heat exchange with the flue gas, and correspondingly, the separated gas is gathered and released in the water containing space 32. Further, the communicating structure 35 allows a gas release/accumulation space to be always present above the liquid surface when the water level is not at a predetermined level (for example, when the water level is not fully stored), thereby discharging the gas. 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 35 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 tolerance and separate out great scene, still can not exist gaseous entering second water pump 40 and lead to idling, 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 35 communicates with the atmosphere outside thereof at least when the water level inside the water containing space 32 is lower than a preset level. The communicating structure 35 may be in communication with other containers than the buffer container 30, such as a gas collecting container, a drain pipe, or may be in direct communication with the atmosphere. The communication structure 35 is closed when the internal water level of the water containing volume 32 is higher than a preset water level. The preset water level may be more than 50% of the water containing space 32, or the preset water level may be 70% or 100%, for example, when the water is full, the communicating structure 35 is closed to form the closed water containing space 32. As the pressure inside the water containing space 32 increases by the suction of the second water pump 40 and the gas evolution, the water level of the water containing space 32 gradually decreases until the communicating structure 35 (automatic exhaust valve) is reopened.

In other embodiments, the communicating structure 35 may also be in communication with the outside, i.e., even above the preset water level, the communicating structure 35 may also be in communication with the outside. For example, the communicating structure 35 is a communicating 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 be communicated with a drain pipe to drain the overflow.

In this embodiment, the buffer container 30 is a tank structure, which stores warm water after heat exchange with flue gas or heat exchange, and further provides a heat preservation measure outside the buffer container 30 to prevent heat dissipation. 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 communication structure 35 is configured to communicate with the atmosphere when the water level is lower than a predetermined water level and to be disconnected from the atmosphere when the water level is higher than the predetermined water level. It can be understood that, when the buffer container 30 is in a water-free state or a water-deficient state, the communicating structure 35 is opened, and at this time, in the process of inputting water into the buffer container, the communicating structure 35 is kept in an open state, so that gas can escape without pressure, the gas content of the water entering the second water pump 40 is reduced, and the hidden trouble that the second water pump 40 cannot supplement water due to idling is eliminated.

The communicating structure 35 is a normally open type exhaust valve 35 (e.g., a normally open type automatic exhaust valve) disposed at the upper end of the buffer container 30. The communicating structure 35 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 which is linked with the plugging valve core, and floats upwards when the liquid level rises to a predetermined liquid level (water level) Shi Fupiao 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 of the second water pump 40 due to large air volume can be avoided.

It should be noted that, in a possible embodiment, the buffer container 30 is further provided with a communication structure 35 communicating with the outside when the internal pressure thereof is higher than the head of the first water pump 10. For example, the buffer container 30 is further provided with a communicating structure 35 that communicates with the outside when the internal pressure (pressure difference from the outside atmosphere) thereof is greater than 0.4 Pa. The communicating structure 35 can be a normally closed exhaust valve 35, that is, the communicating structure 35 is closed when the water level inside the communicating structure is low, and as the gas is precipitated and accumulated, the pressure is increased to reach the opening pressure (0.4 MPa, 1MPA and the like) of the communicating structure 35, and the communicating structure 35 is opened to exhaust the gas. The opening pressure of the communicating structure 35 may be set lower to avoid pressure build-up.

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

In this embodiment, the input interface (water inlet end 301) of the buffer container 30 communicated with the heat exchanger is higher than the output interface (output end 302) 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 302) of the buffer container 30 is close to the bottom thereof or disposed at the bottom thereof, for example, the water outlet end thereof is lower than 50% of the height position of the water containing space (relative to the bottom surface of the water containing space 32). In order to facilitate cleaning the buffer container 30, the bottom of the buffer container 30 is also communicated with a pollution discharge structure 37 capable of controlling opening and closing. The drain structure 37 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 36 such as a water level probe. The water level detector 36 is disposed at the top of the buffer container 30 and detects whether water or a 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 first preset water level such as 60% water level is reached), 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 36 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 36 is conducted when the supplement water in the buffer container 30 reaches a certain liquid level, the second water pump 40 is started, and at the moment, the first water pump 10 and the second water pump 40 operate 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 35 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 be continuously reduced until the communication structure 35 is opened again, and in the process, the second water pump 40 can continuously and stably suck the warm water with the separated gas, so that the problem that water cannot be supplemented due to idling is avoided. In a state where the communication structure 35 is opened or the water containing space 32 (water containing exhaust space) is communicated with the outside, the flow rate of the first water pump 10 is larger 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 36, 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 water replenishing mode, firstly, water is replenished into the buffer container 30, the water is replenished into the steam generation body 50 through the second water pump 40 after reaching a certain liquid level, and the preheated water is slowly exhausted through the buffer container 30, so that the problem of incapability of replenishing water is solved.

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 (steam generating body water replenishing level) and the water level in the buffer container 30 is higher than the first predetermined water level (large pump start level), the second water pump 40 and the first water pump 10 are simultaneously started to replenish water into the steam generating body 50.

In addition, the second water pump 40 is always in a starting state when water is supplemented into the steam generating body 50, so that the problem that water cannot be smoothly supplemented into the furnace body by a small pump alone due to 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 time, and only the buffer container 30 meets the water level in the water replenishing mode, that is, the second water pump 40 (large pump) is relied on to replenish water to the steam generation body 50 in the embodiment.

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 water level is greater than or equal to the second predetermined water 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 is lower than a water replenishing water level (entering a 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.

As shown in fig. 6, in the present embodiment, the second heat exchange assembly is a condensing heat exchanger 20 for recovering the flue gas waste heat 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 communicates 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 tank 30 is a buffer water storage tank 30a connected to the upstream of the second water pump 40 and the downstream of the heat exchanger 20. The height of the buffer water storage tank 30a is lower than that of the condensing heat exchanger 20, and the buffer water storage tank 30a is disposed below the condensing heat exchanger 20. The height of the buffer water storage tank 30a is more than 0.2m and less than 1.5 m; the cross-sectional area of the water containing space 32 of the buffer water storage tank 30a is more than 100 square centimeters. For example, the water-containing space 32 of the buffer container 30 is a cylindrical cavity having 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 30a through a second pipeline, and the water inlet end of the buffer water storage tank 30a 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. The bottom of the lower header of the steam generating body 50 is also provided with a drain pipe.

In order to further avoid the problem of gas evolution, the steam generating device further comprises a communicating structure 35 communicated with the upstream of the water inlet end of the body. The communication structure 35 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 35 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 35 includes an automatic air release valve 35 (a normally closed air release valve 35) integrated with 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.

In one possible embodiment as shown in fig. 4 and 5, a buffer container 30b of a new structure is provided. The buffer vessel 30b is integrated in the heat exchanger 20. The heat exchanger 20 comprises a shell 31 (21) and a flue gas pipeline 23 arranged in the shell 31 (21) in a penetrating way; the inner flow path of the flue gas duct 23 provides a second flue gas flow path (flue gas flow space). A preheating flow channel (water flow space) is formed between the shell 31 (21) and the flue gas pipe 23, and the preheating flow channel forms a water containing space 32, that is, the water containing space 32 of the buffer container 30 is formed between the shell 31 (21) and the flue gas pipe 23.

In this embodiment, the buffer container 30 and the heat exchanger 20 form an integrated structure, and unlike the condensing heat exchanger in the previous embodiment in which cold water flows through the tube, the heat exchanger 20 (30 b) is a fire tube type normal pressure (condensing) heat exchanger in which flue gas flows through the tube 23 and cold water flows through the tube 23 for preheating. Accordingly, the space outside the tube is both the preheating flow channel and the water containing space 32. The heat exchanger housing 21 is also an outer shell 31 of the buffer container 30, and in this case, the flue gas duct 23 is inserted into the buffer container 30 to heat water in the buffer container 30. The gas in the water is discharged to the atmosphere through the communicating structure 35 at the upper end of the buffer container 30. When the communicating structure 35 is in the open state, the upper portion of the liquid surface of the water containing space 32 is at atmospheric pressure.

As shown in connection with fig. 2-4. An embodiment of the present disclosure also provides a control method of a steam generating apparatus, which can be performed as an operation control method and controls operation by a control host and/or a human. The operation method is suitable for but not limited to the steam generating equipment in the embodiment, and can be suitable for a serial steam generating waterway structure adopting double pumps, so that the operation control of the double pumps is realized, and the stable output of steam is facilitated.

In the control method, the first water pump 10 is started to replenish water into the buffer container 30 when the water level in the buffer container 30 is lower than a second predetermined water level. The second predetermined water level is a water replenishing level of the buffer container 30.

In this embodiment, when the water level of the steam generating body 50 is lower than the water replenishing water level and the water level in the buffer container 30 is higher than the first predetermined water level, the second water pump 40 is started to replenish water into the steam generating body 50. The first predetermined water level may be equal to or greater than the second predetermined water level.

Preferably, the first predetermined water level and the second predetermined water level are respectively equal to or higher than 50% of the maximum water level (maximum water level) in the buffer container 30, for example, the first predetermined water level and the second predetermined water level are respectively equal to 85% and 65% of the maximum water level of the buffer container 30. As will be seen from the above description, the first predetermined level is preferably equal to the second predetermined level.

In other possible embodiments, the refill water level (second predetermined water level) is below 50& max water level in the buffer container 30, for example, the refill water level (second predetermined water level) may be 40% of the max water level of the buffer container 30. That is, in the water replenishing mode of the steam generating body 50, when it is detected that the water in the buffer container 30 is higher than 85%, the first water pump and the second water pump can be directly and simultaneously started to replenish water to the steam generating body 50; when the water in the buffer container 30 is detected to be lower than 40%, the first water pump is started to replenish water into the buffer container 30.

The control method has simple logic and strong reliability, and is suitable for water vapor supply under different scenes.

In a specific embodiment, the first water pump 10 is started to replenish water into the buffer container 30 when the water level of the steam generating body 50 is lower than the water replenishing water level and the water level in the buffer container 30 is lower than a second predetermined water level, and the second water pump 40 is started to replenish water into the steam generating body 50 when the water level in the buffer container 30 is higher than the first predetermined water level. The second predetermined water level is above 60% of the maximum water level (maximum water level) in the buffer container 30, for example, the second predetermined water level may be 85% of the maximum water level of the buffer container 30. The second predetermined level is equal to the first predetermined level.

In a preferred embodiment of the present disclosure, a relay heat transfer buffer is also provided. The relay heat transfer buffer is suitable for use in the steam generating apparatus described above. Wherein, the relay heat transfer buffer comprises a water flow space and a smoke flowing space which can exchange heat. The water flow space is used for communicating between the first water pump 10 and the second water pump 40. The flue gas input end 24 of the flue gas flow space is adapted to communicate with the flue gas output end 55. The heat and power transfer buffer is provided with a water containing space 32 with the volume of 1L-500L at the downstream of the water inlet end of the water flow space (the water inlet end of the heat exchanger 20) and the upstream of the second water pump 40, and preferably, the volume of the water containing space 32 is 20L-50L.

In the present embodiment, the water flow space provides the water containing space 32, or the water containing space 32 is communicated with the downstream of the water flow space, and generally, the water flow space is communicated with the downstream of the water inlet end (the water inlet end of the preheating flow passage) of the water flow space. The heat transfer buffer includes the second heat exchange assembly and the buffer container 30 in the above embodiment, the water flow space may refer to the description of the preheating flow channel, the flue gas flow space refers to the description of the second flue gas flow channel, the contents of the above embodiments may be fully incorporated herein, and repeated details are not repeated.

In the embodiment shown in fig. 2, 3 and 6, the heat transfer buffer comprises a condensing heat exchanger 20 having the water flow space and the flue gas flow space, and a buffer water storage tank 30a having the water containing space 32. The water inlet end of the buffer water storage tank 30a is communicated with the water outlet end of the condensing heat exchanger 20. The water outlet end of the buffer water storage tank 30a is communicated with the water inlet end of the second water pump 40. The buffer water storage tank 30a is communicated between the condensing heat exchanger 20 and the second water pump 40. The top of the buffer water storage tank 30a is provided with a normally open type automatic exhaust valve 35 as a communicating structure 35 communicating with the outside atmosphere to exhaust the gas. The top of the buffer water storage tank 30a is also provided with a liquid level meter to detect the liquid level of the inner water containing space 32. The bottom of the buffer water storage tank 30a is also communicated with a pollution discharge structure 37 capable of controlling opening and closing. In the present embodiment, the first water pump 10, the condensing heat exchanger 20, the buffer water storage tank 30a, the second water pump 40, and the steam generating body 50 are sequentially connected in series.

In the embodiment shown in fig. 5, the thermodynamic heat transfer buffer integrates the buffer vessel 30 with the heat exchanger 20 to form a heat pipe type heat exchanger 20. Wherein, the heat transfer buffer of heating power includes heat transfer casing, wears to locate flue gas pipeline 23 in the heat transfer casing. The inner lumen of the flue gas duct 23 forms a flue gas flow space. The flue gas input 24 of the flue gas duct 23 is below the flue gas output 25. A water flow space is formed between the flue gas pipeline 23 and the inner wall of the heat exchange shell. The water flow space constitutes the water containing space 32. At this time, a buffer cavity is formed inside the heat exchange shell, and is heated by the flue gas pipeline, so that gas in water is separated out and is discharged outwards through the exhaust valve 35 at the top.

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 include 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 about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

All articles and references disclosed, including patent applications and publications, are incorporated by reference herein for all purposes. The term "consisting essentially of …" describing a combination shall include the identified elements, components, parts or steps as well as other elements, components, parts or steps that 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 described attributes 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 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 subject matter.

Claims

1. A steam generating apparatus, comprising: the first water pump, the heat exchanger, the second water pump and the steam generating body are communicated in series; the water flow sequentially flows through the first water pump, the heat exchanger and the second water pump to enter the steam generation body; the steam generating body is provided with a steam output end for outputting steam and a flue gas output end for outputting flue gas;

a flue gas channel of the heat exchanger is communicated with the flue gas output end; the lift of the first water pump is smaller than that of the second water pump and larger than the water resistance of the heat exchanger;

2. The steam generating apparatus as claimed in claim 1, wherein the buffer container is further provided with a communication structure for communicating the water containing space with the outside when the water level inside the buffer container is lower than a preset water level.

3. The steam generating apparatus of claim 1, wherein the buffer container is further provided with a communication structure communicating with the outside when the internal pressure thereof is greater than a predetermined pressure.

4. The steam generating apparatus of claim 2, wherein the communication structure is communicated with the external atmosphere when the water level inside the water containing space is lower than a preset level.

5. The steam generating apparatus of claim 1, wherein the buffer tank is a buffer water storage tank in communication with an upstream of the second water pump and a downstream of the heat exchanger.

6. The steam generating apparatus of claim 1, wherein the buffer vessel has a volume of between 1L and 500L, and further wherein the buffer vessel has a volume of between 20L and 50L.

7. The steam generating apparatus of claim 1, wherein the communication structure is configured to communicate with the external atmosphere when the water level is below a predetermined water level and to be disconnected from the external atmosphere when the water level is above the predetermined water level.

8. The steam generating apparatus of claim 1, wherein the communication structure is a normally open type automatic exhaust valve provided at an upper portion of the buffer container.

9. The steam generating apparatus of claim 1, wherein the communication structure is a communication hole provided at an upper portion of the buffer container.

10. The steam generating apparatus of claim 1, wherein the communication structure is located at a height of more than 50% from an inner bottom surface of the buffer container.

11. A steam generating apparatus as defined in claim 1, wherein the buffer vessel is integrated with the heat exchanger; the heat exchanger comprises a shell and a flue gas pipeline arranged in the shell; and a water containing space of the buffer container is formed between the shell and the flue gas pipeline.

12. The steam generating apparatus of claim 1, wherein the bottom of the buffer container is further communicated with a drain structure that can be controlled to open and close.

13. The steam generating apparatus of claim 1, wherein the buffer container is further provided with at least one water level detecting gauge;

14. The steam generating apparatus of claim 13, wherein the controller is further configured to activate a second water pump to replenish water into the steam generating body if the water level of the steam generating body is below a level of replenished water and the water level in the buffer container is above a first predetermined level; the first predetermined water level is greater than or equal to a second predetermined water level.

15. The steam generating apparatus of claim 13, wherein the controller is further configured to simultaneously activate the first and second water pumps to replenish water into the steam generating body when the water level of the steam generating body is below a level of replenishing water and the water level in the buffer container is above a first predetermined level; the first predetermined water level is greater than or equal to a second predetermined water level.

16. The steam generating apparatus as claimed in claim 13, wherein the controller is adapted to start the first water pump to replenish water into the buffer container in case that the water level of the steam generating body is lower than the replenishing water level and the water level in the buffer container is lower than a second predetermined water level, and start the second water pump to replenish water into the steam generating body until the water level of the buffer container reaches the first predetermined water level; the second predetermined water level is less than or equal to the first predetermined water level.

17. A method of operating a steam generating apparatus as claimed in any one of claims 1 to 16, comprising: and starting the first water pump to replenish water into the buffer container under the condition that the water level in the water containing space is lower than a second preset water level.

18. The method of operation of claim 17, further comprising: starting a second water pump to supplement water into the steam generation body under the condition that the water level of the steam generation body is lower than a water supplement water level and the water level in the buffer container is higher than a first preset water level; the first predetermined water level is greater than or equal to a second predetermined water level; further, the first water pump and the second water pump are started simultaneously to supplement water into the steam generation body.