Steam generating equipment and operating method thereof

Abstract

Disclosed are a steam generating device that is exempt from inspection and an operating method thereof, wherein the steam generating device comprises: a first water pump, a condensing heat exchanger, a second water pump and a steam generating body that are connected in series in sequence; water flows through the first water pump, the condensing heat exchanger and the second water pump in sequence and enters the steam generating body; the first water pump has a water inlet end for inputting water, and the steam generating body has a steam output end for outputting steam and a smoke output end for outputting smoke; the smoke flow duct of the condensing heat exchanger is connected to the smoke output end; the lift of the first water pump is smaller than the lift of the second water pump and larger than the water resistance of the second heat exchange component.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steam generation, and in particular to a steam generation device and an operating method thereof. Background Art

[0002] Compared with traditional steam boilers, the inspection-free / report-free cross-flow gas steam generator has a faster steam production speed, is more energy-saving and environmentally friendly, and does not require installation inspection and annual boiler review. It is widely favored by the market and is widely used in national production and life, such as hotels, guesthouses, food processing, textiles, chemicals, feed processing and other industries.

[0003] The water volume calculation method, that is, the total geometric volume inside the inlet and outlet of the steam-water system, includes the entire pressure-bearing space volume from the water feed pump outlet to the steam outlet of the equipment. Based on this calculation method, the water volume of most cross-flow gas steam generators on the current market far exceeds 30 liters, and the condenser installed in the equipment is a pressure-bearing component, which has high pressure requirements and poses a considerable safety hazard. Summary of the Invention

[0004] To solve the above problems, the applicant filed an application on March 30, 2022 with application number 2022207372895, entitled Steam Generating Equipment and System Thereof. In order to reduce the volume of pressurized water, the system sets up multi-stage heat exchange on the circulating water circuit where the condensing heat exchanger is located, and then exchanges heat on the incoming water, thereby achieving energy saving and improving the reduction of pressurized water volume. However, the water in the circulating water circuit in this application needs to flow back into the water tank, and there will be a lot of impurities in the circulating water, which will affect the water quality of the water tank, not only affecting the normal service life of the equipment, but also affecting the steam quality. In addition, the complex piping design and the increase in the number of components used will also increase the probability of component damage and maintenance.

[0005] Furthermore, as stated in the previously applied patent, if the booster pump is moved downstream of the condenser, although the condenser does not require a pressure-bearing design and the pressurized water volume of the steam generator can be reduced, the complex flow channel design of the condenser will cause the pumping efficiency of the booster pump to decrease, and the water pumped by the booster pump cannot be supplied to the steam generator body in a timely manner or it is difficult to meet the water level control requirements of the steam generator body, and thus it cannot be actually applied.

[0006] In view of the above research, one purpose of the present disclosure is to provide a steam generating device and an operating method thereof, which can not only ensure the utilization rate of the heat of gas combustion, but also avoid affecting the steam generation rate and evaporation amount of the steam generator on the basis of improving the water volume and achieving true safety and exemption from inspection.

[0007] To achieve the above objectives, the present disclosure adopts the following technical solutions:

[0008] A steam generating device comprising:

[0009] A first heat exchange assembly is defined having a first flue gas flow channel and a steam generation flow channel; water in the steam generation flow channel exchanges heat with flue gas in the first flue gas flow channel to form steam; the first heat exchange assembly has a body water inlet end for inputting water and a flue gas outlet end for outputting flue gas;

[0010] A second heat exchange assembly is defined having a second flue gas flow channel and a preheating flow channel; the second flue gas flow channel is connected to the downstream of the first flue gas flow channel; 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 has a first water inlet end and a first water outlet end;

[0011] a first water pump connected to the upstream of the first water inlet; the lift of the first water pump is configured to be greater than the water resistance of the second heat exchange assembly;

[0012] A second water pump is connected between the first water outlet and the water inlet of the body and has a lift greater than that of the first water pump.

[0013] As one aspect of the present disclosure, the lift of the first water pump is less than 10m, and the lift of the second water pump is greater than 10m; further, the lift of the first water pump is greater than 2m and less than 10m, and the lift of the second water pump is greater than 40m; further, the lift of the first water pump is greater than 5m and less than 9m, and the lift of the second water pump is greater than 80m.

[0014] As one aspect of the present disclosure, it also includes an exhaust structure connected between the water inlet end of the body and the first water outlet end.

[0015] As one aspect of the present disclosure, the exhaust mechanism includes an automatic exhaust valve integrated on the second water pump.

[0016] As one aspect of the present disclosure, the water inlet end of the first water pump is configured to be connected to a water storage container; the second heat exchange component is a condensing heat exchanger; and the first heat exchange component is a steam generating body.

[0017] As one aspect of the present disclosure, the steam generating equipment includes: a controller, a flame detector for detecting the flame of a burner installed in the steam generating body; the controller electrically connects the flame detector and the first water pump, and is configured to keep the first water pump in an operating state when the flame detector detects a flame signal.

[0018] As one aspect of the present disclosure, the steam generating device includes a controller electrically connecting the first water pump and the second water pump and enabling the first water pump to start before the second water pump.

[0019] As one aspect of the present disclosure, the steam generating equipment includes: a liquid level sensor for detecting the liquid level of the steam generating body; the controller electrically connects 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.

[0020] As one aspect of the present disclosure, the internal geometric volume of the steam generating equipment between the water outlet end of the second water pump and the steam output end of the steam generating body is less than 30L.

[0021] A steam generating device comprises: a first water pump, a condensing heat exchanger, a second water pump, and a steam generating body connected in series in sequence; water flows through the first water pump, the condensing heat exchanger, and the second water pump in sequence and enters the steam generating body; the first water pump has a water inlet for inputting water, the steam generating body has a steam output end for outputting steam and a smoke output end for outputting smoke; the smoke flow passage of the condensing heat exchanger is connected to the smoke output end; the lift of the first water pump is smaller than the lift of the second water pump and greater than the water resistance of the second heat exchange component;

[0022] The steam generating body includes a shell, a heat exchange unit located inside the shell, and a burner extending into the combustion space formed by the heat exchange unit; one end of the burner is connected to a fan and a gas valve; the steam generating body is also provided with an ignition component for igniting the burner and a flame detector for sensing the flame of the burner; the steam generating body is also provided with a liquid level sensor for detecting the liquid level inside it.

[0023] As one aspect of the present disclosure, the lift of the first water pump is less than 10m, and the lift of the second water pump is greater than 10m; further, the lift of the first water pump is greater than 2m and less than 10m, and the lift of the second water pump is greater than 40m; further, the lift of the first water pump is greater than 5m and less than 9m, and the lift of the second water pump is greater than 80m.

[0024] As one aspect of the present disclosure, it further includes an exhaust structure connected between the steam generating body and the condensing heat exchanger. Specifically, the exhaust mechanism includes an automatic exhaust valve integrated on the second water pump.

[0025] A method for operating a steam generating device, comprising:

[0026] When the initial water level of the steam generator body is lower than the first water level, starting the first water pump to replenish water to the steam generator body, and the first water level is lower than the target working water level;

[0027] starting the second water pump when the water level of the steam generating body rises;

[0028] When the water replenishment of the steam generating body reaches a pump-stopping water level not lower than a target working water level, at least the second water pump is stopped;

[0029] Ignition; when there is a flame signal in the steam generating body, the first water pump remains in operation;

[0030] When the water level of the steam generator body drops to the target working water level or is located near the target working water level, the second water pump is started to maintain the water level of the steam generator body at the target working water level.

[0031] A method for operating a steam generating device, comprising: starting a first water pump to replenish water to the steam generating body when an initial water level of the steam generating body is lower than a first water level, the first water level being lower than a target operating water level;

[0032] The operating method further includes: when there is a flame signal in the steam generating body, and / or the gas control valve is in an open state, and / or the fan is at least in a stable operating state, the first water pump remains in an operating state.

[0033] As one aspect of the present disclosure, the second water pump is started when the water level of the steam generator body is raised, or the second water pump is started a predetermined time after the first water pump is started, and the second water pump and the first water pump continue to replenish water to the steam generator body together;

[0034] Preferably, it is determined that the water level of the steam generating body has increased when the water replenishment of the steam generating body reaches a first starting water level that is not lower than the first water level.

[0035] As one aspect of the present disclosure, it includes: when the water replenishment of the steam generator body reaches a pump-stop water level not lower than the target working water level, at least the second water pump is stopped; more specifically, the second water pump and the first water pump are stopped.

[0036] As one aspect of the present disclosure, it includes: ignition, starting the first water pump after detecting a flame signal; when the water level of the steam generator body drops 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 generator body at the target working water level.

[0037] As one aspect of the present disclosure, it includes: starting the fan when the water level of the steam generating body reaches the fan start water level or starting the fan after at least the second water pump is stopped, and igniting the fan after it runs for a predetermined time.

[0038] As an aspect of the present disclosure, it also includes: when the initial water level of the steam generating body is higher than the first water level and lower than the target working water level, starting the first water pump to replenish water to the steam generating body until the water replenished to the steam generating body reaches a preset water level to execute a preset process.

[0039] As one aspect of the present disclosure, the second water pump is started after starting the first water pump, or the second water pump is started at the same time as starting the first water pump. The first water pump and the second water pump simultaneously replenish water to the steam generating body until the water level of the steam generating body reaches a pump-stop water level that is not lower than the target working water level, and at least the second water pump is stopped.

[0040] As one aspect of the present disclosure, the first water pump is started by receiving a start instruction;

[0041] Specifically, when the initial water level of the steam generator body is lower than the first water level, the system enters a fault mode, issues an alarm signal and stops firing; upon receiving a start-up instruction, the system starts the first water pump to replenish water to the steam generator body;

[0042] When the water level of the steam generator body reaches an alarm release water level not lower than the first water level, it enters a reset state in which the fault alarm can be eliminated; when the water level of the steam generator body reaches a fan start water level in the fault alarm elimination state, the fan is started.

[0043] As an aspect of the present disclosure, it also includes: when the initial water level of the steam generating body is lower than the first water level or the target working water level, the first water pump is started to replenish water to the steam generating body until the water level reaches a pump-stop water level that is not lower than the target working water level, and the second water pump remains in a stopped state.

[0044] As an aspect of the present disclosure, it also includes: starting the fan when the initial water level of the steam generating body is not lower than the target working water level; igniting the fan after a predetermined time; starting the first water pump when a flame signal is detected; starting the second water pump according to a predetermined rule to maintain the water level of the steam generating body at the target working water level.

[0045] As one aspect of the present disclosure, starting the second water pump according to a predetermined rule is performed as follows: starting the second water pump when the water level of the steam generator body drops to a second starting water level, or starting the second water pump a predetermined time after the first water pump is started, or controlling the second water pump to start simultaneously with the first water pump.

[0046] In one embodiment of the present disclosure, a steam generating device is configured for dual-pump operation. A first water pump is placed in front of the condensing heat exchanger to offset the water resistance of the condensing heat exchanger. A second water pump placed downstream of the condensing heat exchanger is offset by the first water pump during operation due to the water resistance (pipeline resistance) of the condensing heat exchanger. As a result, the condensing heat exchanger has little effect on the pumping efficiency of the second water pump or even eliminates it. As a result, under the action of the dual pumps, water can be supplied to the steam generating body (furnace body) in a timely manner to meet the water level control requirements of the steam generating body.

[0047] In addition, the condensing heat exchanger is located upstream of the second water pump and does not require a pressure-bearing design. Therefore, the condensing heat exchanger (economizer) is not a pressure-bearing device, which can better improve the pressurized water volume, so that the internal geometric volume of the steam generating equipment from the water outlet of the second water pump to the steam output end of the steam generating body is less than 30L, thereby achieving true safety and exemption from inspection without affecting the steam generation rate and evaporation amount of the steam generator or steam boiler.

[0048] The present invention discloses an operating method for a steam generating device in accordance with an embodiment of the present invention. By controlling the start and stop of dual pumps, the idling of the second water pump (large pump) is avoided, water is quickly added to the furnace body, and the liquid level in the furnace body is maintained stable, so that the steam generating device can produce gas stably and efficiently.

[0049] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0050] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0051] It should be emphasized that the term "include / comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0053] Figure 1 This is a schematic diagram of a water path of a steam generating device according to an embodiment of the present disclosure;

[0054] Figure 2 is a three-dimensional structural diagram of a steam generating device according to an embodiment of the present disclosure;

[0055] Figure 3 yes Figure 2 Internal view of the furnace;

[0056] Figure 4 This is a flow chart of the operation of a steam generating device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to 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 in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0058] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0060] See also Figures 1 to 3 An embodiment of the present disclosure provides a steam generating device, which is applicable to but not limited to an inspection-free steam generator or steam boiler, and has a water volume of less than 30L.

[0061] The steam generating device includes a first heat exchange assembly, a second heat exchange assembly, a first water pump 100, and a second water pump 300. The first heat exchange assembly defines a first heat exchange assembly comprising a first flue gas flow channel and a steam generation channel. Water in the steam generation channel exchanges heat with flue gas in the first flue gas flow channel to form steam. The first heat exchange assembly has a water inlet 410 for inputting water and a flue gas outlet 420 for outputting flue gas.

[0062] The second heat exchange assembly comprises a second flue gas flow channel and a preheating channel. The second flue gas flow channel is connected downstream of the first flue gas flow channel. Water in the preheating channel exchanges heat with the flue gas in the second flue gas flow channel to be heated. The preheating channel has a first water inlet 210 and a first water outlet 211. In this embodiment, the water inlet and outlet are configured with flanged connections.

[0063] The first water pump 100 is connected upstream of the first water inlet 210. The water inlet of the first water pump 100 receives water from an external source and is configured to communicate with a water storage container. The water storage container can be provided by an external water tank, a water tower, or a water tank, and this disclosure is not limited thereto.

[0064] The lift 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 connected between the first water outlet 211 and the water inlet 410 of the steam generator body, and the lift of the second water pump 300 is greater than that of the first water pump 100. The first water pump 100, the condensing heat exchanger 200, the second water pump 300, and the steam generator body 400 are sequentially connected in series. Water flows through the first water pump 100, the condensing heat exchanger 200, the second water pump 300, and then enters the steam generator body 400.

[0065] The lift of the first water pump 100 is less than 10m, while the lift of the second water pump 300 is greater than 10m. Furthermore, the lift of the first water pump 100 is greater than 2m and less than 10m, while 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, while the lift of the second water pump 300 is greater than 80m, thereby ensuring water replenishment efficiency and steam output efficiency.

[0066] The internal geometric volume of the steam generating device from the water outlet 311 of the second water pump 300 to the steam output end 411 of the steam generating body 400 is less than 30L. The first water pump 100 is a fixed frequency pump, and the second water pump 300 is a variable frequency pump. Specifically, the second water pump 300 can be a multi-stage centrifugal variable frequency water pump to provide a larger head and form a pressurized waterway downstream thereof. Figure 1 The first water pump 100 is a 6m head fixed frequency pump, and the second water pump 300 is a 150m head booster pump (variable frequency pump). The upstream waterway of the second water pump 300 is a normal pressure pipeline (non-pressure pipeline), and the downstream waterway is a pressure pipeline.

[0067] In this embodiment, the steam generating device is a cross-flow steam generator. Specifically, the first heat exchange assembly includes a steam generating body 400 (furnace body 400) having a water inlet 410 for inputting water and a flue gas outlet 420 for outputting flue gas. The steam generating body 400 includes a shell 401, a heat exchange unit 450 located within the shell 401, and a burner 420 extending into a combustion space 455 enclosed by the heat exchange unit 450. The burner 420 is a tubular burner. The upper end of the steam generating body 400 defines an upper header 431, and the lower end defines a lower header 430. The heat exchange unit 450 is confined between the upper header 431 and the lower header 430. The heat exchange unit 450 is a single circle of multiple vertical heat exchange tubes arranged in a circumferential direction. The interior of the vertical heat exchange tubes forms a steam generation flow channel, and the exterior forms a first flue gas flow channel. The first flue gas flow channel is connected to the flue gas outlet 420. The steam generating body 400 is provided with only a single circle of vertical heat exchange tubes to reduce the water volume.

[0068] One end of the burner 420 ( Figure 2 The steam generator body 400 is also equipped with an ignition component, such as an ignition needle 481, for igniting the burner, and a flame detector, such as a flame probe 485, for sensing the burner flame. The ignition component and flame detector are fixedly mounted on the floor of the combustion chamber 455.

[0069] The steam generator body 400 is used to heat water to form steam. The structure of the steam generator body 400 can be found in the description of the Chinese patent application filed by the applicant on January 24, 2022, with application number 202210081118.6, entitled "Novel Cross-Flow Steam Generator or Steam Boiler and Heat Exchange Unit Thereof." Any repetition will be omitted.

[0070] In this embodiment, the second heat exchange component is a condensing heat exchanger 200 that recovers the waste heat of the flue gas at the flue gas output end 420 of the steam generator body 400. The first fluid flow channel includes an internal flow channel of the condensing heat exchange tube in the condensing heat exchanger 200, and the second flue gas flow channel is limited to the interior of the shell of the condensing heat exchanger 200. The condensing heat exchanger 200 is connected to a first water pump 100 that drives the fluid flow. The first water pump 100 is connected in series between the water inlet connector 50 (equipment water inlet end 50) and the water inlet end 210 (first water inlet end 210) of the first fluid flow channel. There is a flue gas inlet 220 on the condensing heat exchanger shell 201, which is connected to the flue gas output end 420 of the steam generator body 400. There is a smoke exhaust port 221 at the top of the condensing heat exchanger shell 201. The condensing heat exchanger 200 has a first water inlet 210 and a first water outlet 211. Multiple condensing heat exchange tubes are defined between the first water inlet 210 and the first water outlet 211. The first water inlet 210 and the water outlet of the first water pump 100 are connected via a first pipe 150. The water inlet of the first water pump 100 is connected to a water inlet connector 50 for external cold water input.

[0071] To achieve automatic control of the equipment, the steam generating equipment includes a controller. The controller is electrically connected to the flame detector (flame probe 485) and the first water pump 100. The controller is configured to maintain the first water pump 100 in operation when 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 activates the first water pump 100 before the second water pump 300 to prevent the second water pump 300 from idling. Of course, the controller can also activate the first water pump 100 and the second water pump 300 simultaneously.

[0072] The steam generator body 400 is further provided with a liquid level sensor 435 to detect the water level of the steam generator body 400. The controller is electrically connected to the second water pump 300 and the liquid level sensor 435. The controller controls the first water pump 100 and the second water pump 300 according to the water level detected by the liquid level sensor 435.

[0073] In this embodiment, the water inlet 310 of the second water pump 300 is connected to the first water outlet 211 of the condensing heat exchanger 200 through a second pipe 250, and the water outlet 311 of the second water pump 300 is connected to the main water inlet 410 of the steam generator body 400 through a third pipe 350. The main water inlet 410 is arranged at the bottom of the steam generator body 400 and is connected to the lower header 430. The steam output 411 is arranged at the top of the steam generator body 400 and is connected to the upper header 431. The smoke output 420 is arranged on the side wall of the steam generator body 400, forming a smoke exhaust outlet, and is fixedly connected to the smoke inlet 220 of the condensing heat exchanger 200 by a flange. A drain pipe 600 is also provided at the bottom of the lower header 430 of the steam generator body 400.

[0074] After further research, it was found that when the second water pump 300 is connected to the downstream of the condensing heat exchanger 200, the condensing heat exchanger 200 preheats the cold water, and the preheated water temperature can reach 70 degrees or above 80 degrees. This causes the gas in the water to precipitate or even vaporize to produce a large amount of gas flowing together. The gas gathers at the second water pump 300 to form bubble air masses, which not only causes cavitation problems and affects the service life of the pump, but also reduces the pump efficiency of the second water pump 300, making it impossible to supply water to the furnace body 400 in time, resulting in unstable liquid level in the furnace body 400 and inability to produce stable steam.

[0075] To avoid this problem, the steam generating device also includes an exhaust structure connected between the water inlet end 410 of the main 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 preset difference (starting pressure difference) of the external air pressure, and the internal gas is discharged to prevent the gas from being supplied to the furnace body 400. Specifically, the exhaust mechanism includes an automatic exhaust valve 350 integrated on the second water pump 300. The starting pressure difference of the automatic exhaust valve 350 is between 0.1mPa and 1mPa, which avoids the accumulation of internal gas and reduces cavitation on the second water pump 300. In addition, the exhaust structure can also be provided on the second pipe 250.

[0076] Combine Figure 1-Figure 3 ,like Figure 4 As shown, one embodiment of the present disclosure also provides a method for operating a steam generating device, which can be implemented as an operation control method and operated by a host computer and / or manual control. This operation method is applicable to, but not limited to, the steam generating device described in the above embodiment. It can also be applied to a steam generating water circuit structure using two pumps in series, achieving operation control of the two pumps and facilitating stable steam production.

[0077] In this embodiment, the operating method includes: when the initial water level in the steam generator body 400 is lower than a first water level (e.g., 20% water level), activating the first water pump 100 to replenish water to the steam generator body 400, wherein the first water level is lower than a target operating water level. The first water level is a fault alarm level, which can be lower than the target operating water level by at least 10% or 20%.

[0078] The target operating water level can be a water level range or water level value set as desired, and is not limited in the embodiments of the present disclosure. When the target operating water level is a range value, the lower or higher values ​​mentioned in the disclosed embodiments are lower than or higher than the target operating water level, respectively.

[0079] The first water pump 100 can be activated by the main unit of the device when certain conditions are met, or manually activated by a manual command. For example, when the water level in the steam generator body 400 falls below a first water level, the device enters a fault mode, issues an alarm signal, and shuts down. Upon receiving a start command, the first water pump 100 is activated to replenish water to the steam generator body 400.

[0080] Accordingly, when the initial water level of the steam generating body 400 reaches an alarm release water level that is not lower than the first water level, it enters a reset state in which the fault alarm can be eliminated. In the fault alarm elimination state, the fan 500 is started when the water level of the steam generating body 400 reaches the fan start water level, and the fan start water level is not higher than the target working water level. The alarm release water level is not higher than the fan start water level, and further, the alarm release water level is lower than the fan start water level. For example, the alarm release water level is equal to or slightly greater than the first start water level, and the fan start water level is slightly lower than the target working water level. In other feasible embodiments, the fan 500 can also be restarted after the first water pump 100 and the second water pump 300 are shut down.

[0081] To improve water replenishment efficiency, the second water pump 300 can be activated later under predetermined conditions to replenish water at a high flow rate and shorten the replenishment time. Specifically, the second water pump 300 can be activated when the water level in the steam generator body 400 rises, or it can be activated a predetermined time after the first water pump 100 is activated to prevent the second water pump 300 from idling. After the second water pump 300 is activated, it continues to replenish water to the steam generator body 400 together with the first water pump 100.

[0082] In this embodiment, the water level of the steam generator body 400 is determined to have increased when the water level in the steam generator body 400 reaches a first starting water level that is no less than the first water level. Alternatively, the water level in the steam generator body 400 is determined to have increased when the water level in the steam generator body 400 is higher than the initial water level (the water level before the first water pump 100 is activated). To simplify program control and ensure stable system operation, the first starting water level can be equal to the first water level, or it can be determined by adding a set value to the first water level. As an illustrative example, the set value can be set within 10% of the water level.

[0083] Of course, in other feasible embodiments, the second water pump 300 may not be started, and only the first water pump 100 may be operated until water is replenished to the pump stop water level, which is higher than the target operating water level. Alternatively, the first water pump 100 may be operated until ignition is performed, and the second water pump 300 may be started based on the second starting water level after ignition. For example, in one feasible embodiment, when the initial water level of the steam generator body 400 is lower than the first water level or the target operating water level, the first water pump 100 may be started to replenish water to the steam generator body 400 until a preset water level not lower than the target operating water level, and the second water pump 300 may remain in a stopped state. When the preset water level is reached, the fan 500 may be started, the ignition may be performed, or the first water pump 100 may enter a shutdown process.

[0084] In an unignited state, such as during shutdown, when the initial water level in the steam generator body 400 is higher than the first water level and lower than the target operating water level, the first water pump 100 and the second water pump 300 are simultaneously activated to replenish water to the steam generator body 400. Alternatively, the first water pump 100 is activated first and then the second water pump 300 is activated to replenish water to the steam generator body 400. However, when the initial water level in the steam generator body 400 is higher than the target operating water level, the first water pump 100 and the second water pump 300 are not activated immediately. After the fan is activated to perform the cleaning process and ignition is successful, the first water pump 100 and the second water pump 300 are activated according to the corresponding execution rules.

[0085] In this embodiment, when the steam generator body 400 is replenished with water and reaches a pump-stopping water level not lower than the target working water level, at least the second water pump 300 is stopped. More specifically, when the steam generator body 400 is replenished with water and reaches a pump-stopping water level not lower than the target working water level, the second water pump 300 and the first water pump 100 are stopped.

[0086] Following the above description, after the fan 500 is started, a cleaning process is performed, and the speed of the fan 500 is gradually stabilized. The fan 500 is started and ignited after a predetermined time. Accordingly, the operating method includes an ignition (process). In the ignition process, the gas valve 510 is started and ignition is performed through the ignition needle 481. After the (flame probe 485) detects the flame signal, the first water pump 100 is started, that is, the first water pump 100 is started after the ignition is successful. When the water level of the steam generating body 400 drops to the second starting 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 starting water level is equal to the target working water level, or the second starting water level is near the target working water level, which can be set by adding or subtracting a preset value from the target working water level. Preferably, the second starting water level is lower than the target working water level. For example, the second starting water level can be taken within the range of ±10% of the target working water level.

[0087] Of course, the starting method of the second water pump 300 is not limited to the above example. For example, the second water pump 300 can be started according to a predetermined rule to maintain the water level of the steam generating body 400 at the target working water level, wherein the starting of the second water pump 300 according to the predetermined rule is performed as follows: starting the second water pump 300 when the water level of the steam generating body 400 drops to the second starting water level, or starting the second water pump 300 after the first water pump 100 is started for a predetermined time, or controlling the second water pump 300 to start at the same time as the first water pump 100.

[0088] In the embodiment of the present disclosure, the cleaning process and the water replenishment process can be performed simultaneously or after the water replenishment process. In this embodiment, water replenishment is in progress when the cleaning process is started (the fan 500 is started), and the water replenishment is completed during the cleaning process and the pump is stopped. Accordingly, at the end of the cleaning process, the first water pump 100 and the second water pump 300 are in a pump-stop state.

[0089] It should be noted that the first water level, the first starting water level, the second starting water level, the fan starting water level, the alarm release water level, and the pump stop water level can all be set independently by humans, or can be determined based on the target working water level by adding or subtracting a set value. This disclosure does not limit this.

[0090] In a feasible embodiment, when it is detected that the initial water level of the steam generating body 400 is lower than the target working water level in the shutdown state, the first water pump 100 is started to replenish water to the steam generating body 400 until the water level is not lower than the target working water level, for example, replenishing water to the pump stop water level to stop the pump, or starting the fan 500 until the target working water level. During this process, the second water pump 300 remains in the shutdown state, and at this time, water is only replenished into the steam generating body 400 through the first water pump 100.

[0091] In this embodiment, the operating method further includes: when the steam generator body 400 is in a flame signal state, and / or the gas control valve is in an open state, and / or the fan 500 is at least in a stable operating state, the first water pump 100 remains in an operating state, regardless of the liquid level of the steam generating equipment. By setting corresponding startup conditions, the first water pump 100 can remain in operation when a flame signal is present (the burner is in a combustion state). Of course, the first water pump 100 can also remain in operation based on the open state of the gas valve 510. Furthermore, when the second water pump 300 is in an operating state, the first water pump 100 remains in an operating state. In this way, the first water pump 100 is always in an operating state when the second water pump 300 is in operation, thereby avoiding the presence of a vacuum between the two and ensuring the stable operation of the second water pump 300. Accordingly, the operating time of the first water pump 100 will be greater than the operating time of the second water pump 300.

[0092] Following the above description, when the main unit is not running and the initial water level of the steam generator body 400 is detected to be higher than the target working water level, and is determined to be higher than the fan start water level (since the initial water level is higher than the target working water level and must be higher than the fan start water level, there is no need to confirm whether it 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. After the cleaning process is completed, ignition is performed, and the first water pump 100 and the second water pump 300 are started in sequence according to the above description.

[0093] like Figure 4 In a specific embodiment shown, upon startup, the target operating water level is set at 60%. After a period of operation, due to conditions such as insufficient water supply, dry burning, or water leakage, the initial water level in the furnace body 400 (the water level before the first water pump 100 is activated) drops below 20% of the water level (hereinafter referred to as the 20% water level, the first water level, or water level A1). At this point, the device displays an alarm message or emits an audible or visual alarm signal via a display screen, alarm bell, or warning light. The furnace body 400 is shut down, and the fan 500, burner, first water pump 100, and second water pump 300 cease operation.

[0094] After maintenance, the furnace body 400 is not known to be short of water, and the second water pump 300 is not expected to idle. Therefore, water is replenished into the furnace body 400. The operator inputs a start command for the first water pump 100 to the main unit through an operating button, touch switch, or keyboard indicator. Upon receiving the input command, the main unit activates the first water pump 100. After activation, the first water pump 100 supplies water into the furnace body 400.

[0095] 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 has risen, and the water from the first water pump 100 enters the furnace body 400 through the second water pump 300, and it can be confirmed that the second water pump 300 is full of water. At this time, the device host (controller) starts the second water pump 300 to ensure that the second water pump 300 does not run idle. After the second water pump 300 is started, the first water pump 100 and the second water pump 300 jointly replenish water to the furnace body 400 to improve the water replenishment efficiency. In other feasible embodiments, the second water pump 300 can also be started a predetermined time after the first water pump 100 is started. The predetermined time can be more than 10s. For example, the second water pump 300 can be started 20s after the first water pump 100 is started.

[0096] When the first and second water pumps 100 and 300 jointly replenish water until the water level reaches 30% (the alarm contact level), the system enters a reset state, where the fault alarm can be cleared. At this point, the system can reset the fault alarm by operating buttons on the main unit or input components such as the touch screen or keyboard, returning to normal operating mode. Only in normal operating mode can the fan 500 and burner be started.

[0097] Continue to refer to Figure 4 , the first water pump 100 and the second water pump 300 jointly supply water to the furnace body 400 until the water level in the furnace body 400 reaches 50% water level (fan start water level, water level A5), then the fan 500 is started to perform the cleaning process, the gas in the furnace body 400 is discharged, and the speed of the fan 500 is stabilized, and the gas valve 510 remains closed. The cleaning process lasts for more than 10s (predetermined time), for example, the cleaning process is performed for 20 to 80s. During this process, the first water pump 100 and the second water pump 300 jointly supply water to the furnace body 400 until the water level in the furnace body 400 reaches 90% water level (pump stop water level, water level A3), and then stop. Due to the high flow rate of water supplied by the first water pump 100 and the second water pump 300, the pump stop water level is reached before the end of the cleaning process, and the first and second water pumps 300 have stopped.

[0098] After the cleaning process is complete, the main unit controls the opening of the gas valve 510 and the ignition of the burner. When the flame probe 485 detects a flame signal, it indicates successful ignition. Since the water level in the furnace 400 is now higher than the target operating level, only the first water pump 100 is activated, while the second water pump 300 remains off. As combustion progresses, the liquid level in the furnace 400 gradually decreases. When the liquid level in the furnace 400 reaches 55% (the second starting level in the operating mode, water level A4), the second water pump 300 is activated. Since the second water pump 300 is a variable frequency pump, its speed can be controlled using a closed-loop PID control method, such as PID control, to maintain the water level in the pump at 60% (the target operating level), ensuring stable, continuous, and efficient steam production.

[0099] When the initial water level in the furnace body 400 is not less than 20% (water level A1), a determination is made as to whether the initial water level in the furnace body 400 is less than 55% (preset water level, water level A2). If the initial water level in the furnace body 400 is less than 55%, the first water pump 100 and the second water pump 300 are simultaneously activated until the water level reaches 90% (the pump stop level, water level A3), and subsequent steps are performed as described above. Simultaneously, when the two pumps jointly replenish water until the water level in the furnace body 400 reaches 50% (the fan start level, water level A5), the fan 500 is activated to perform the cleaning step. If the initial water level itself is not less than the fan start level, the fan 500 is directly activated to perform the cleaning step.

[0100] 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 (the fan start water level, water level A5). When it is higher than the fan start water level, the fan 500 is started to perform the cleaning process, and subsequent processes are performed as described above.

[0101] It should be noted that in the embodiment of the present application, water level A2 and water level A5 are preferably greater than the fan start water level, and water level A2 is preferably directly used as the target working water level to simplify the judgment operation logic and ensure stable operation of the system.

[0102] Any numerical value cited herein includes all values ​​of the lower and upper values ​​in increments of one unit from the lower limit to the upper limit, and there is an interval of at least two units between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is set forth to be from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of the numerical values ​​listed between the minimum and maximum values ​​are explicitly set forth in this specification in a similar manner.

[0103] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. When used with a range, "about" or "approximately" 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 specified endpoints.

[0104] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." when describing a combination should include the identified elements, ingredients, components, or steps 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 a combination of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may," it is intended to indicate that any attribute described as "may" be optional.

[0105] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0106] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to be a disclaimer of such subject matter, nor should it be assumed that the inventors did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A steam generating device, characterized in that: include: A first water pump, a condensing heat exchanger, a second water pump, and a steam generator body are sequentially connected in series; water flows through the first water pump, the condensing heat exchanger, and the second water pump in sequence and enters the steam generator body; the first water pump has a water inlet for inputting water, and the steam generator body has a steam output end for outputting steam and a smoke output end for outputting smoke; the smoke flow channel of the condensing heat exchanger is connected to the smoke output end; the lift of the first water pump is smaller than the lift of the second water pump and greater than the water resistance of the condensing heat exchanger; The steam generating body includes a shell, a heat exchange unit located inside the shell, and a burner extending into the combustion space formed by the heat exchange unit; one end of the burner is connected to a fan and a gas valve; the steam generating body is also provided with an ignition component for igniting the burner and a flame detector for sensing the flame of the burner.

2. The steam generating device according to claim 1, wherein: The lift of the first water pump is less than 10m, and the lift of the second water pump is greater than 10m; or, the lift of the first water pump is greater than 2m and less than 10m, and the lift of the second water pump is greater than 40m; or, the lift of the first water pump is greater than 5m and less than 9m, and the lift of the second water pump is greater than 80m.

3. The steam generating device according to claim 1, wherein: It also includes an exhaust mechanism connected between the steam generating body and the condensing heat exchanger, and the exhaust mechanism includes an automatic exhaust valve integrated on the second water pump; the steam generating body is also provided with a liquid level sensor for detecting the liquid level inside it.

4. A method for controlling the operation of a steam generating device according to any one of claims 1 to 3, comprising: When the initial water level of the steam generator body is lower than the first water level, starting the first water pump to replenish water to the steam generator body, and the first water level is lower than the target working water level; starting the second water pump when the water level of the steam generating body rises; When the water replenishment of the steam generating body reaches a pump-stopping water level not lower than a target working water level, at least the second water pump is stopped; Ignition; when there is a flame signal in the steam generating body, the first water pump remains in operation; When the water level of the steam generator body drops to the target working water level or is located near the target working water level, the second water pump is started to maintain the water level of the steam generator body at the target working water level.

5. A method for operating a steam generating device according to any one of claims 1 to 3, comprising: When the initial water level of the steam generator body is lower than the first water level, starting the first water pump to replenish water to the steam generator body, and the first water level is lower than the target working water level; The operating method further includes: when there is a flame signal in the steam generating body, and / or the gas control valve is in an open state, and / or the fan is at least in a stable operating state, the first water pump remains in an operating state.

6. The operating method according to claim 5, wherein: include: When the water level of the steam generator body rises, the second water pump is started, or the second water pump is started a predetermined time after the first water pump is started, and the second water pump and the first water pump continue to supply water to the steam generator body together; When the water replenishment of the steam generating body reaches a first starting water level that is not lower than the first water level, it is determined that the water level of the steam generating body is increased.

7. The operating method according to claim 6, wherein: include: When the water replenishment of the steam generating body reaches a pump-stopping water level that is not lower than the target working water level, at least the second water pump is stopped.

8. The operating method according to claim 7, wherein: include: Ignition, start the first water pump after detecting the flame signal; when the water level of the steam generator body drops to the target working water level or a second starting water level near the target working water level, start the second water pump and maintain the water level of the steam generator body at the target working water level.

9. The operating method according to claim 7, wherein: include: The fan is started when the water level of the steam generating body reaches the fan starting water level or after at least the second water pump is stopped, and the fan is ignited after running for a predetermined time.

10. The operating method according to claim 5, wherein: It also includes: when the initial water level of the steam generating body is higher than the first water level and lower than the target working water level, starting the first water pump to replenish water to the steam generating body until the water replenished to the steam generating body reaches a preset water level to execute a preset process.

11. The operating method according to claim 10, wherein: The second water pump is started after starting the first water pump, or the second water pump is started at the same time as the first water pump. The first water pump and the second water pump simultaneously replenish water to the steam generating body until the water level of the steam generating body reaches a pump-stop water level that is not lower than the target working water level, and at least the second water pump is stopped.

12. The operating method according to claim 5, wherein: starting the first water pump by receiving a start instruction; When the initial water level of the steam generator body is lower than the first water level, the system enters a fault mode, issues an alarm signal and stops firing; upon receiving a start command, the system starts the first water pump to replenish water to the steam generator body; When the water level of the steam generator body reaches an alarm release water level not lower than the first water level, it enters a reset state in which the fault alarm can be eliminated; when the water level of the steam generator body reaches a fan start water level in the fault alarm elimination state, the fan is started.

13. The operating method according to claim 5, wherein: It also includes: when the initial water level of the steam generating body is lower than the first water level or the target working water level, starting the first water pump to replenish water to the steam generating body until the water level reaches a pump stop water level not lower than the target working water level, and the second water pump remains in a stopped state.

14. The operating method according to claim 5, wherein: It also includes: starting the fan when the initial water level of the steam generating body is not lower than the target working water level; igniting after a predetermined time of starting the fan; starting the first water pump when a flame signal is detected; starting the second water pump according to a predetermined rule to maintain the water level of the steam generating body at the target working water level.

15. The operating method according to claim 14, wherein: The starting of the second water pump according to a predetermined rule is performed as follows: starting the second water pump when the water level of the steam generator body drops to a second starting water level, or starting the second water pump a predetermined time after the first water pump is started, or controlling the second water pump to start simultaneously with the first water pump.

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