CN217978748U - Steam generating apparatus - Google Patents

Abstract

Disclosed is a report-free steam generating apparatus, wherein the steam generating apparatus comprises: a first heat exchange assembly defining a first flue gas channel and a steam generation channel; 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 flue gas output end for outputting flue gas; a second heat exchange assembly defining a second flue gas channel and a preheat channel; the second flue gas channel is communicated with the downstream of the first flue gas channel; 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; the first water pump is communicated with the upstream of the first water inlet end; the head of the first water pump is configured to be larger than the water resistance of the second heat exchange component; and the second water pump is communicated between the first water outlet end and the water inlet end of the body, and the lift of the second water pump is greater than that of the first water pump.

Description

Steam generating apparatus

Technical Field

The disclosure relates to the technical field of steam generation, in particular to steam generation equipment 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 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.

Disclosure of Invention

The applicant is for solving above-mentioned problem, and application number 2022207372895 that applies for 3, 30 of 2022 is named steam generation equipment and system thereof, and this system sets up multistage heat transfer on the circulating water route at condensation heat exchanger place in order to reduce the confined water volume, and then carries out the heat transfer to intaking, realizes energy-conservation, improves and reduces the confined water volume. However, the water in the circulation water route in this application need flow back to the water tank in, and can have more impurity in the circulation water, influences water tank quality of water, not only influences the normal life of equipment, influences the steam quality moreover. In addition, the complicated pipeline design and the increased number of used components also result in increased probability of damage and maintenance of the used components.

Furthermore, as said in the patent of the previous application, if the booster pump is moved to the downstream of the condenser, although the condenser does not need a pressure-bearing design and can reduce the pressure-bearing water volume of the steam generator, the pumping efficiency of the booster pump is reduced due to the complex flow channel design of the condenser, the pumped water of the booster pump cannot be supplied to the steam generator body in time or cannot meet the requirement of water level control of the steam generator body, and thus cannot be practically applied.

In view of the above research, an object of the present disclosure is to provide a steam generating apparatus and an operating method thereof, which can not only ensure the utilization rate of combustion heat of gas, but also avoid affecting the steam generating speed and evaporation capacity of a steam generator on the basis of improving water volume and realizing real safety inspection-free.

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

a steam generating apparatus comprising:

a first heat exchange assembly defining a first flue gas channel and a steam generation channel; 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;

a second heat exchange assembly defining a second flue gas channel and a preheat channel; the second flue gas channel is communicated with the downstream of the first flue gas channel; 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;

the first water pump is communicated with the upstream of the first water inlet end; the head of the first water pump is configured to be larger than the water resistance of the second heat exchange assembly;

and the second water pump is communicated between the first water outlet end and the water inlet end of the body, and the lift of the second water pump is greater than that of the first water pump.

As an aspect of the present disclosure, the head of the first water pump is less than 10m, and the head of the second water pump is greater than 10m; furthermore, the lift of the first water pump is more than 2m and less than 10m, and the lift of the second water pump is more than 40m; furthermore, the lift of the first water pump is more than 5m and less than 9m, and the lift of the second water pump is more than 80m.

As one aspect of the disclosure, the water outlet device further comprises an air exhaust structure communicated between the water inlet end of the body and the first water outlet end.

As one aspect of the present disclosure, the air exhaust structure includes an automatic air exhaust valve integrated on the second water pump.

As one aspect of the disclosure, the water inlet end of the first water pump is configured to be communicated with a water storage container; the second heat exchange assembly is a condensing heat exchanger; the first heat exchange assembly is a steam generation body.

As one aspect of the present disclosure, the steam generating apparatus includes: a controller for detecting a flame detector of a flame of a burner installed in the steam generating body; the controller is electrically connected with the flame detector and the first water pump and is configured to enable the first water pump to keep in a running working state under the condition that the flame detector detects a flame signal.

As one aspect of the present disclosure, the steam generating apparatus includes a controller electrically connecting the first water pump and the second water pump and causing the first water pump to be activated prior to the second water pump.

As one aspect of the present disclosure, the steam generating apparatus includes: a liquid level sensor for detecting the liquid level of the steam generating body; the controller is electrically connected with the second water pump and the liquid level sensor; the controller controls the first water pump and the second water pump according to the water level detected by the liquid level sensor.

As an aspect of the present disclosure, an inner 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 below 30L.

A steam generating apparatus comprising: the first water pump, the condensation heat exchanger, the second water pump and the steam generation body are sequentially connected in series; the water flow sequentially flows through the first water pump, the condensing heat exchanger and the second water pump and enters the steam generation body; the first water pump is provided with a water inlet end for inputting water, and 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 condensing 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 second heat exchange component;

the steam generating body comprises a shell, a heat exchange unit positioned in the shell and a burner extending into a combustion space formed by the enclosing of the heat exchange unit; one end of the combustor is communicated with the fan and the gas valve; an ignition component for igniting the burner and a flame detector for sensing the flame of the burner are also arranged in the steam generating body; the steam generation body is also provided with a liquid level sensor for detecting the liquid level inside the steam generation body.

As an aspect of the present disclosure, the head of the first water pump is less than 10m, and the head of the second water pump is greater than 10m; further, the lift of the first water pump is more than 2m and less than 10m, and the lift of the second water pump is more than 40m; furthermore, the lift of the first water pump is more than 5m and less than 9m, and the lift of the second water pump is more than 80m.

As an aspect of the disclosure, the steam generator further includes an exhaust structure communicated between the steam generating body and the condensing heat exchanger, and in particular, the exhaust structure includes an automatic exhaust valve integrated on the second water pump.

A method of operating a steam generating apparatus, comprising:

when the initial water level of the steam generating body is lower than a first water level (for example, 20% water level), starting the first water pump to replenish water to the steam generating body, wherein the first water level is lower than a target working water level;

starting the second water pump when the water level of the steam generating body is lifted;

when the water replenishing of the steam generation body reaches a pump stopping water level which is not lower than the target working water level, at least stopping the second water pump;

igniting; the first water pump keeps running under the condition that the flame signal exists in the steam generating body;

and when the water level of the steam generation body is reduced to a target working water level or is positioned near the target working water level, starting the second water pump, and maintaining the water level of the steam generation body at the target working water level.

A method of operating a steam generating apparatus comprising: under the condition that the initial water level of the steam generation body is lower than a first water level, starting the first water pump to supplement water to the steam generation body, wherein the first water level is lower than a target working water level;

the operating method further comprises: and under the condition that a flame signal exists in the steam generating body, and/or a gas control valve is in an open state, and/or a fan is at least in a stable running state, the first water pump keeps running and working.

As one aspect of the present disclosure, includes: when the water level of the steam generation body is raised, starting the second water pump, or starting the second water pump after the first water pump is started for a preset time, wherein the second water pump and the first water pump jointly continue to supply water to the steam generation body;

preferably, it is determined that the water level of the steam generating body is raised when the water supply of the steam generating body reaches a first start water level not lower than the first water level.

As one aspect of the present disclosure, includes: when the water replenishing of the steam generating body reaches a pump stopping water level which is not lower than the target working water level, at least stopping the second water pump; more specifically, the second water pump and the first water pump are stopped.

As one aspect of the present disclosure, includes: igniting, and starting a first water pump after detecting a flame signal; and when the water level of the steam generation body is reduced to a target working water level or a second starting water level near the target working water level, starting the second water pump, and maintaining the water level of the steam generation body at the target working water level.

As one aspect of the present disclosure, includes: and starting the fan when the water level of the steam generation body reaches the fan starting water level or starting the fan after at least stopping the second water pump, and igniting after the fan operates for a preset time.

As an aspect of the present disclosure, further comprising: and when the initial water level of the steam generation body is higher than the first water level and lower than the target working water level, starting a first water pump to replenish water to the steam generation body until the water replenishing of the steam generation body reaches a preset water level to execute a preset process.

As an aspect of the present disclosure, the second water pump is started after the first water pump is started, or the second water pump is started while the first water pump is started, the first water pump and the second water pump simultaneously supply water to the steam generating body until the water level of the steam generating body reaches a pump stop water level not lower than a target working water level, and at least the second water pump is stopped.

As one aspect of the present disclosure, the first water pump is started by receiving a start instruction;

specifically, when the initial water level of the steam generating body is lower than a first water level, the steam generating body enters a fault mode, sends out an alarm signal and stops fire; starting a first water pump to replenish water to the steam generation body when a starting instruction is received;

entering a reset state capable of eliminating fault alarm when the water level of the steam generating body reaches an alarm relieving water level which is not lower than a first water level; and starting the fan when the water level of the steam generation body reaches the fan starting water level in the state of eliminating the fault alarm.

As an aspect of the present disclosure, further comprising: and when the initial water level of the steam generation body is lower than the first water level or the target working water level, starting the first water pump to supplement water to the steam generation body until the water level reaches a pump stopping water level which is not lower than the target working water level, and keeping the second water pump in a stopping state.

As an aspect of the present disclosure, further comprising: starting a fan when the initial water level of the steam generation body is not lower than the target working water level; igniting after starting the fan for preset time; starting a first water pump when a flame signal is detected; and starting a second water pump according to a preset rule, and maintaining the water level of the steam generation body at the target working water level.

As an aspect of the disclosure, the starting the second water pump according to the predetermined rule is performed as: and starting the second water pump when the water level of the steam generation body is reduced to a second starting water level, or starting the second water pump after the first water pump is started for a preset time, or controlling the second water pump and the first water pump to be started simultaneously.

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

And the condensing heat exchanger is positioned at the upstream of the second water pump, a pressure-bearing design is not needed, and then the condensing 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 generating equipment from the water outlet end of the second water pump to the steam output end of the steam generating body is below 30L, and the steam generating 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 disclosure are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the disclosure may be employed. It is to be understood that the embodiments of the present disclosure 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 disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive exercise.

FIG. 1 is a schematic water circuit diagram of a steam generating apparatus according to an embodiment of the present disclosure;

FIG. 2 is a perspective view of a steam generating apparatus according to an embodiment of the present disclosure;

FIG. 3 is an interior view of the furnace of FIG. 2;

FIG. 4 is a flow chart of operation of a steam generation facility according to one embodiment of the present disclosure.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

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 disclosure belongs. The terminology used herein in the description of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. 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 3, one embodiment of the present disclosure provides a steam generating apparatus, which is suitable for, but not limited to, a non-inspection type steam generator or a steam boiler, and has a water volume below 30L.

The steam generating apparatus includes: a first heat exchange assembly, a second heat exchange assembly, a first water pump 100, and a second water pump 300. 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 has a body water inlet end 410 for inputting water and a flue gas output end 420 for outputting flue gas.

The second heat exchange assembly is limited with a second flue gas flow channel and a preheating flow channel. The second flue gas channel is communicated with the downstream of the first flue gas channel; 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 path has a first water inlet end 210 and a first water outlet end 211. In this embodiment, the water inlet end and the water outlet end are configured with flange connection structures.

The first water pump 100 is connected to the upstream of the first water inlet end 210. The water inlet end of the first water pump 100 is externally supplied with water and is configured to communicate with a water storage container. The water storage 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 100 is configured to be greater than the water resistance of the second heat exchange assembly. The second water pump 300 is communicated between the first water outlet end 211 and the body water inlet end 410, and the lift of the second water pump 300 is greater than the lift of the first water pump 100. The first water pump 100, the condensing heat exchanger 200, the second water pump 300 and the steam generating body 400 are sequentially communicated in series. The water flows through the first water pump 100, the condensing heat exchanger 200, and the second water pump 300 in sequence to enter the steam generating body 400.

The lift of the first water pump 100 is less than 10m, and the lift of the second water pump 300 is greater than 10m. Further, the lift of the first water pump 100 is greater than 2m and less than 10m, and the lift of the second water pump 300 is greater than 40m. Furthermore, the lift of the first water pump 100 is greater than 5m and less than 9m, and the lift of the second water pump 300 is greater than 80m, so that the water replenishing efficiency and the steam output efficiency are ensured.

The inner geometric volume of the steam generating device from the water outlet 311 of the second water pump 300 to the steam output 411 of the steam generating body 400 is below 30L. The first water pump 100 is a fixed-frequency pump, the second water pump 300 is a variable-frequency pump, and specifically, the second water pump 300 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 100 is a 6 m-head fixed-frequency pump, and the second water pump 300 is a 150 m-head booster pump (variable-frequency pump). The upstream waterway of the second water pump 300 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, the first heat exchange assembly includes a steam generating body 400 (furnace body 400) having a body water inlet end 410 for inputting water and a flue gas output end 420 for outputting flue gas. The steam generating body 400 includes a housing 401, a heat exchange unit 450 located in the housing 401, and a burner 420 extended into a combustion space 455 defined by the heat exchange unit 450. The burner 420 is a can burner. The steam generating body 400 has an upper header 431 defined at an upper end thereof and a lower header 430 defined at a lower end thereof. The heat exchange unit 450 is defined between the upper header 431 and the lower header 430. The heat exchange unit 450 is a plurality of vertical heat exchange tubes arranged in a single circle along the circumferential direction. 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 in communication with the flue gas output 420. The steam generating body 400 is provided with only a single turn of vertical heat exchanging pipe to reduce the water capacity.

One end (the lower end in fig. 2) of the burner 420 is communicated with a fan 500, and the fan 500 is communicated with a gas valve 510. The fan 500 has a gas inlet and an air inlet, the air inlet is connected with a filter 550, and the gas inlet is connected with a gas valve 510. Also provided in the steam generating body 400 are an ignition part such as an ignition needle 481 for ignition of the burner and a flame detector such as a flame probe 485 that senses the flame of the burner. The ignition element and the flame detector are fixedly mounted on the floor of the combustion space 455.

The steam generating body 400 serves to heat water to form steam. With regard to the structure of the steam generating body 400, reference may be made to the description of the applicant in the chinese patent application with the publication number 202210081118.6, filed on 24.01.2022, entitled "novel through-flow steam generator or steam boiler and heat exchange unit thereof", and the repeated description is omitted.

In this embodiment, the second heat exchange assembly is a condensing heat exchanger 200 for recovering the flue gas waste heat at the flue gas output end 420 of the steam generating body 400. The first fluid flow path comprises the internal flow path of the condensing heat exchange tubes within the condensing heat exchanger 200 and the second flue gas flow path is defined within the interior of the shell of the condensing heat exchanger 200. The condensing heat exchanger 200 is connected to a first water pump 100 for driving a fluid to flow. The first water pump 100 is connected in series between the water inlet connection 50 (the device inlet end 50) and the inlet end 210 of the first fluid flow path (the first inlet end 210). The condensing heat exchanger shell 201 has a flue gas inlet 220 which is in communication with a flue gas outlet 420 of the steam generating body 400. The top of the condensing heat exchanger shell 201 has an exhaust port 221. The condensing heat exchanger 200 has a first water inlet end 210 and a first water outlet end 211, and a plurality of condensing heat exchange tubes connected in series or in parallel are defined between the first water inlet end 210 and the first water outlet end 211. The first water inlet end 210 is communicated with the water outlet end of the first water pump 100 through the first pipeline 150, and the water inlet end of the first water pump 100 is communicated with the water inlet joint 50 to input external cold water.

In order to realize the automatic control operation of the equipment, the steam generating equipment comprises: and a controller. The controller is electrically connected with the flame detector (flame probe 485) and the first water pump 100, and the controller is configured to keep the first water pump 100 in a running working state under the condition that the flame detector detects a flame signal. The controller is electrically connected to the first water pump 100 and the second water pump 300, and the first water pump 100 is started before the second water pump 300, so as to prevent the second water pump 300 from idling. Of course, the controller may also activate the first and second water pumps 100 and 300 at the same time.

The steam generating body 400 is further provided with a liquid level sensor 435 to acquire the water level of the steam generating body 400. The controller is electrically connected to the second water pump 300 and the liquid level sensor 435. The controller controls the first and second water pumps 100 and 300 according to the water level detected by the level sensor 435.

In this embodiment, the water inlet end 310 of the second water pump 300 is communicated with the first water outlet end 211 of the condensing heat exchanger 200 through the second pipe 250, and the water outlet end 311 of the second water pump 300 is communicated with the water inlet end 410 of the steam generating body 400 through the third pipe 350. The body water inlet end 410 is provided at the bottom of the steam generating body 400 to communicate with the lower header 430. The steam outlet 411 is provided at the top of the steam generating body 400 to communicate with the upper header 431. The flue gas outlet 420 is disposed on the sidewall of the steam generating body 400 to form a flue gas outlet, and is fixedly connected to the flue gas inlet 220 of the condensing heat exchanger 200 via a flange. A drain pipe 600 is further provided at the bottom of the lower header 430 of the steam generating body 400.

Further research shows that when the second water pump 300 is communicated with the downstream of the condensation heat exchanger 200, the condensation heat exchanger 200 preheats cold water, the preheated water temperature can reach 70 degrees or more than 80 degrees, so that gas in the water is separated out and even gasified to generate a large amount of gas which flows together, the gas is gathered at the second water pump 300 to form a bubble air mass, the cavitation problem is solved, the service life of the pump is influenced, the pump efficiency of the second water pump 300 can be reduced, the water cannot be supplied to the furnace body 400 in time, the liquid level of the furnace body 400 is unstable, and the steam cannot be stably produced.

To avoid this problem, the steam generating apparatus further comprises an air discharging structure communicated between the water inlet end 410 of the body and the first water outlet end 211. The exhaust structure is located between the steam generating body 400 and the condensing heat exchanger 200. The exhaust structure is activated when the internal air pressure exceeds the external air pressure by a preset difference (activation pressure difference), and exhausts the internal air to prevent the air from being supplied to the furnace body 400. Specifically, the exhaust structure includes an automatic exhaust valve 350 integrated with the second water pump 300. The starting pressure difference of the automatic exhaust valve 350 is 0.1 mPa-1 mPa, so that the internal gas is prevented from being accumulated, and the cavitation of the second water pump 300 is reduced. In addition, an exhaust structure may also be disposed on the second duct 250.

Referring to fig. 4 in conjunction with fig. 1 to 3, an embodiment of the present disclosure also provides an operation method of a steam generating apparatus, which may 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 this embodiment, the operating method includes: in case that the initial water level of the steam generating body 400 is lower than a first water level (for example, 20% water level), which is lower than a target working water level, the first water pump 100 is started to supplement water to the steam generating body 400. The first water level is a fault alarm water level, and can be lower than the target working water level by more than 10% difference water level or more than 20% difference water level.

The target operating water level may be a water level range or a water level value set as desired, and the embodiment of the present disclosure is not limited. When the target operating level is a range of values, the values below or above the target operating level in the disclosed embodiments are below the lower threshold and above the upper threshold.

The first water pump 100 may be started by the apparatus main body when corresponding conditions are satisfied, or may be manually started by manually inputting an instruction. Illustratively, when the water level of the steam generating body 400 is lower than a first water level, a fault mode is entered, an alarm signal is given and fire is stopped; and when receiving a starting instruction, starting the first water pump 100 to supplement water to the steam generating body 400.

Accordingly, when the initial water level of the steam generating body 400 reaches the alarm release water level not lower than the first water level, a reset state in which the malfunction alarm is eliminated is entered. And starting the fan 500 when the water level of the steam generation body 400 reaches the fan starting water level in the fault alarm elimination state, wherein the fan starting water level is not higher than the target working water level. The alarm relieving water level is not higher than the fan starting water level, and further, the alarm relieving water level is lower than the fan starting water level. For example, the alarm release water level is equal to or slightly higher than the first start water level, and the fan start water level is slightly lower than the target working water level. In other possible embodiments, the fan 500 may be started after the first and second water pumps 100 and 300 are stopped.

In order to improve the water replenishing efficiency, the second water pump 300 may be started later under a predetermined condition to replenish water at a high flow rate, thereby shortening the water replenishing time. Specifically, the second water pump 300 is started when the water level of the steam generating body 400 rises, or the second water pump 300 is started after the first water pump 100 is started for a predetermined time, so as to prevent the second water pump 300 from idling. After the second water pump 300 is started, the second water pump 300 and the first water pump 100 together supply water to the steam generating body 400.

In this embodiment, when the water in the steam generating body 400 reaches a first start water level not lower than the first water level, it is determined that the water level of the steam generating body 400 is increased. Alternatively, when the water level of the steam generating body 400 is higher than the initial water level (the water level before the first water pump 100 is started), it is determined that the water level of the steam generating body 400 is raised. For simple program control and stable operation of the system, the first start water level may be equal to the first water level, or determined by adding a set value based on the first water level. Schematically illustrated by way of example: the set value may be set within the 10% water level.

Of course, in other possible embodiments, the second water pump 300 may not be activated, and only the first water pump 100 may be operated until the water is supplemented to the pump stop water level, which is higher than the target working water level, or the first water pump 100 may be operated until the ignition is performed, and the second water pump 300 may be activated according to the second activated water level after the ignition is performed. For example, in one possible embodiment, when the initial water level of the steam generating body 400 is lower than the first water level or the target operation water level, the first water pump 100 is activated to replenish water to the steam generating body 400 until a preset water level is not lower than the target operation water level, and the second water pump 300 is maintained in a stopped state. When the preset water level is reached, the fan 500 is started or ignited or the first water pump 100 is stopped.

In case of non-ignition such as shutdown, when the initial water level of the steam generating body 400 is higher than the first water level and lower than the target working water level, the first water pump 100 and the second water pump 300 are simultaneously started to replenish water to the steam generating body 400, or the first water pump 100 is started first and then the second water pump 300 is started to replenish water to the steam generating body 400. When the initial water level of the steam generating body 400 is higher than the target working water level, the first water pump 100 and the second water pump 300 are not started at the first time, and after the blower is started to perform the cleaning process and the ignition is successfully performed, the first water pump 100 and the second water pump 300 are started according to the corresponding execution rules.

In this embodiment, at least the second water pump 300 is stopped when the water is replenished from the steam generating body 400 to a pump stop water level not lower than the target working water level. More specifically, when the water is replenished from the steam generating body 400 to the pump stop level not lower than the target operation level, the second water pump 300 and the first water pump 100 are stopped.

As described above, the cleaning process is performed after the fan 500 is started, and the rotation speed of the fan 500 is gradually stabilized. The blower 500 is ignited after being started for a predetermined time. Accordingly, the method of operation includes ignition (process). In the ignition process, the gas valve 510 is actuated to ignite the ignition needle 481. The first water pump 100 is started after the flame signal is detected (flame probe 485), that is, the first water pump 100 is started after the ignition is successful. When the water level of the steam generating body 400 is lowered to a second start water level, the second water pump 300 is started and the water level of the steam generating body 400 is maintained at the target working water level. The second start water level is equal to the target working water level, or the second start water level is located near the target working water level, which may be set by adding or subtracting a preset value to the target working water level, and preferably, the second start water level is lower than the target working water level. For example, the second start-up water level may be a value within a range of ± 10% of the target working water level.

Of course, the starting manner of the second water pump 300 is not limited to the above example, for example, the second water pump 300 may be started according to a predetermined rule, and the water level of the steam generating body 400 is maintained at the target working water level, wherein the starting of the second water pump 300 according to the predetermined rule is performed as: when the water level of the steam generating body 400 is lowered to a second starting water level, the second water pump 300 is started, or the second water pump 300 is started after the first water pump 100 is started for a predetermined time, or the second water pump 300 and the first water pump 100 are controlled to be started simultaneously.

In the embodiment of the present disclosure, the cleaning process and the water replenishing process may be performed simultaneously, or may be performed after the water replenishing process. In this embodiment, the water supply is ongoing when the cleaning process is started (the blower 500 is started), and the pump is stopped when the water supply is finished during the cleaning process, and accordingly, the first water pump 100 and the second water pump 300 are in the pump stop state when the cleaning process is finished.

It should be noted that the first water level, the first start water level, the second start water level, the fan start water level, the alarm release water level, and the pump stop water level may all be set independently by a human, or may be determined by adding or subtracting a set value based on the target working water level, which is not limited in this disclosure.

In a possible embodiment, when the initial water level of the steam generating body 400 is detected to be lower than the target working water level in the shutdown state, the first water pump 100 is activated to supply water to the steam generating body 400 until the water level is not lower than the target working water level, for example, the water is supplied to the pump-shutdown water level to stop the pump, or the fan 500 is activated until the target working water level, in the process, the second water pump 300 keeps the shutdown state, and at this time, only the first water pump 100 supplies water to the steam generating body 400.

In this embodiment, the operating method further includes: in the case that a flame signal is present in the steam generating body 400, and/or the gas control valve is in an open state, and/or the fan 500 is at least in a steady operation state, the first water pump 100 maintains an operation working state regardless of the liquid level condition of the steam generating device. By setting the respective start-up conditions, the first water pump 100 can be kept in operation in the presence of a flame signal (the burner is in a burning state), and of course, the first water pump 100 can be kept in operation according to the open state of the gas valve 510. And, under second water pump 300 running state, first water pump 100 keeps the running state, so, guarantees that second water pump 300 is in running state at the first water pump 100 inevitable when the operation to avoid having the vacuum between the two, guarantee second water pump 300's steady operation. Accordingly, the first water pump 100 may be operated for a longer period of time than the second water pump 300.

When the initial water level of the steam generation body 400 detected in the state where the main machine is not in operation is higher than the target operating water level, and it is determined that the initial water level is higher than the fan start water level (since the initial water level is inevitably higher than the fan start water level when the initial water level is higher than the target operating water level, it is also possible to determine whether the initial water level is higher than the fan start water level), the fan 500 is started to perform the cleaning process without starting the first water pump 100 and the second water pump 300, the ignition is performed after the cleaning process is completed, and the first water pump 100 and the second water pump 300 are sequentially started according to the above description.

In one embodiment shown in fig. 4, the target operating level is set to a 60% water level at power-on. After the operation for a period of time, the initial water level (the water level before the first water pump 100 is started) in the furnace body 400 is lower than the 20% height water level (the 20% water level for short, the first water level, the water level A1) due to conditions such as insufficient water supply, dry burning, water leakage and the like, at this time, the device displays alarm information or sends out alarm signals such as sound, light and the like through the display screen or the alarm bell and the alarm lamp device, the furnace body 400 is closed, and the fan 500, the burner, the first water pump 100 and the second water pump 300 stop operating.

After the maintenance, since the water shortage condition in the furnace body 400 cannot be known, whether the second water pump 300 is idle or not can be determined, and at the moment, water is supplemented into the furnace body 400. An operator inputs a starting instruction of the first water pump 100 to the equipment host through an operation button, a touch switch or a keyboard lamp, and the equipment host controls the first water pump 100 to start after receiving the input instruction. After the first water pump 100 is started, water is supplied into the furnace body 400.

When the water level in the furnace body 400 reaches the 25% water level, it indicates that the water level in the furnace body 400 is elevated, and the water of the first water pump 100 enters the furnace body 400 through the second water pump 300, so that it can be confirmed that the second water pump 300 is full of water. At this time, the apparatus main unit (controller) starts the second water pump 300, and it is ensured that the second water pump 300 does not idle. After the second water pump 300 is started, the first water pump 100 and the second water pump 300 supplement water to the furnace body 400 together, and the water supplementing efficiency is improved. In other possible embodiments, the second water pump 300 may be started after the first water pump 100 is started for a predetermined time, which may be 10s or more, for example, the second water pump 300 may be started after the first water pump 100 is started for 20 s.

When the water level of the first water pump 100 and the water level of the second water pump 300 are supplemented to 30% water level (alarm contact water level), the first water pump enters a reset state capable of eliminating fault alarm, at the moment, the fault alarm is eliminated by operating a button on the equipment host or input components such as a touch screen and a keyboard, and the first water pump enters a normal working mode. In the normal operation mode, the fan 500 and the burner may be allowed to start up.

With continued reference to fig. 4, when the first water pump 100 and the second water pump 300 supply water to the furnace body 400 together until the water level of the furnace body 400 reaches 50% of the water level (fan start water level, water level A5), the fan 500 is started to perform a cleaning process, so as to discharge the gas in the furnace body 400, stabilize the rotation speed of the fan 500, and keep the gas valve 510 closed. The cleaning process continues for 10 seconds (predetermined time) or more, and is performed for 20 to 80 seconds, for example. In this process, the first water pump 100 and the second water pump 300 supply water to the furnace body 400 together until the water level of the furnace body 400 reaches 90% (pump stop water level, water level A3). The first and second water pumps 300 and 100 are stopped when the pump stop water level is reached before the cleaning process is completed based on the high flow rate of the water supplied by both the first and second water pumps 300 and 100.

After the cleaning process is finished, the gas valve 510 is opened under the control of the equipment host, ignition is controlled to be conducted on the burner, the flame probe 485 shows that the ignition is successful when detecting a flame signal, and only the first water pump 100 is started at the moment because the furnace body 400 is at a high water level higher than the target working water level at the moment, and the second water pump 300 keeps in a closed state. Along with the combustion, the liquid level of the furnace body 400 is gradually reduced, and when the liquid level of the furnace body 400 is reduced to 55% of the liquid level (a second starting liquid level in the working mode, the water level A4), the second water pump 300 is started. Since the second water pump 300 is a variable frequency pump, the rotating speed of the second water pump 300 can be controlled by a PID such as a closed-loop control, and the water level of the pump body can be maintained at 60% (target working water level) to stably, continuously and efficiently produce steam.

And when the initial water level of the furnace body 400 is not lower than the 20% water level (water level A1), it is judged whether the initial water level of the furnace body 400 is lower than 55% (preset water level, water level A2). When the initial water level of the furnace body 400 is lower than the 55% water level, the first water pump 100 and the second water pump 300 are simultaneously started until the water level reaches the 90% water level (pump stop water level, water level A3), and the subsequent processes are performed as described above. Meanwhile, when the water is supplemented by the double pumps together until the water level of the furnace body 400 reaches 50% of the water level (the fan start water level, the water level A5), the fan 500 is started to perform the cleaning process. When the initial water level itself is not lower than the blower start water level, the blower 500 is directly started to perform the cleaning process.

When the initial water level of the furnace body 400 is higher than the 55% water level, it is determined whether the initial water level is higher than the 50% water level (fan start-up water level, water level A5), the fan 500 is started up to perform the cleaning process when the initial water level is higher than the fan start-up water level, and the subsequent processes are performed as described above.

It should be noted that, in the embodiment of the present application, the water level A2 and the water level A5 are preferably greater than the fan starting water level, and the water level A2 preferably directly adopts the target working water level, so as to simplify the judgment operation logic and ensure the stable operation of the system.

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 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 8230to describe a combination shall include the identified element, ingredient, component or step and other elements, ingredients, components 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 (11)

1. A steam generating apparatus, comprising:

a first heat exchange assembly defining a first flue gas channel and a steam generation channel; 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 flue gas output end for outputting flue gas;

a second heat exchange assembly defining a second flue gas channel and a preheat channel; the second flue gas channel is communicated with the downstream of the first flue gas channel; 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;

the first water pump is communicated with the upstream of the first water inlet end; the head of the first water pump is configured to be larger than the water resistance of the second heat exchange component;

and the second water pump is communicated between the first water outlet end and the water inlet end of the body, and the lift of the second water pump is greater than that of the first water pump.

2. A steam generating plant as claimed in claim 1, wherein the first water pump has a head of less than 10m and the second water pump has a head of more than 10m.

3. A steam generating plant as claimed in claim 1, wherein the first water pump has a head of more than 2m and less than 10m and the second water pump has a head of more than 40m.

4. A steam generating apparatus as claimed in claim 1 wherein the first water pump has a head greater than 5m and less than 9m and the second water pump has a head greater than 80m.

5. The steam generating apparatus of claim 1, further comprising an exhaust structure in communication between the body water inlet end and the first water outlet end.

6. The steam generating apparatus of claim 5, wherein the exhaust structure comprises an automatic exhaust valve integrated with the second water pump.

7. The steam generating apparatus of claim 1, wherein a water inlet end of the first water pump is configured to communicate with a water storage container; the second heat exchange assembly is a condensing heat exchanger; the first heat exchange assembly is a steam generation body.

8. The steam generating apparatus of claim 7, wherein the steam generating apparatus comprises: a controller for detecting a flame detector of a burner installed in the steam generating body; the controller is electrically connected with the flame detector and the first water pump and is configured to enable the first water pump to keep a running working state under the condition that the flame detector detects a flame signal.

9. The steam generating apparatus of claim 1, wherein the steam generating apparatus comprises a controller electrically connecting the first water pump and the second water pump and causing the first water pump to start before the second water pump.

10. The steam generating apparatus of claim 8, wherein the steam generating apparatus comprises: a liquid level sensor for detecting the liquid level of the steam generating body; the controller is electrically connected with the second water pump and the liquid level sensor; and the controller controls the first water pump and the second water pump according to the water level detected by the liquid level sensor.

11. The steam generating device of claim 7, wherein an 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 below 30L.

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