CN112781023B - Steam boiler capable of remotely controlling liquid level difference to switch heating - Google Patents

Steam boiler capable of remotely controlling liquid level difference to switch heating Download PDF

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Publication number
CN112781023B
CN112781023B CN202010519375.4A CN202010519375A CN112781023B CN 112781023 B CN112781023 B CN 112781023B CN 202010519375 A CN202010519375 A CN 202010519375A CN 112781023 B CN112781023 B CN 112781023B
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electric heater
liquid level
heating
heat
data
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CN112781023A (en
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陈璐瑶
齐龙
吴芷红
麻晓飞
陈燕慧
高永强
沈保山
刘治彩
张爱云
其他发明人请求不公开姓名
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Shandong Jiaotong University
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Shandong Jiaotong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/18—Applications of computers to steam boiler control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/12—Forms of water tubes, e.g. of varying cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/34—Adaptations of boilers for promoting water circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/78—Adaptations or mounting of level indicators

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention provides a steam boiler capable of remotely controlling liquid level difference to switch heating, which comprises an electric heating device and a steam drum, wherein a first liquid level sensor and a second liquid level sensor are respectively arranged in a first pipe box and a second pipe box, a controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits accumulated data of liquid level difference or liquid level difference change to the cloud server and then transmits the accumulated data to the client through the cloud server, a user can select an automatic control or manual control working mode at the client, and the controller controls heating according to the working mode selected by the user. The invention realizes the automatic control of the heater by the accumulation of the liquid level difference or the change of the liquid level difference through the controller, saves energy, achieves the best efficiency, improves the intellectualization of the heat exchange system and realizes the remote portable monitoring.

Description

Steam boiler capable of remotely controlling liquid level difference to switch heating
Technical Field
The invention relates to steam generation equipment, in particular to an intermittent vibration descaling boiler.
Background
Boilers are mechanical devices that use the heat energy of a fuel or other energy source to heat water into steam. The steam generator has wide application field and is widely applied to places such as clothing factories, dry cleaning shops, restaurants, bunkers, canteens, restaurants, factories and mines, bean product factories and the like. In applicant's prior application, a new coil type electric heating coil, such as CN106123306A, was developed and studied to vibrate the elastic tube bundle due to the expansion of the fluid therein caused by heating, thereby achieving heating and descaling effects.
However, in applications where it is found that continuous heating of the electric heater results in fluid stability of the internal electric heating means, i.e. the fluid is not flowing or is flowing very little, or the flow is stable, the vibration performance of the coil is greatly reduced, and thus the efficiency of the coil for descaling and heating is affected.
In the prior application, referring to fig. 6, the coil is vibrated by intermittent heating, but the intermittent heating may result in heating failure for a period of time, resulting in a reduction in heating power. Therefore, the invention is improved, adopts a more reasonable heating mode and improves the heating efficiency.
However, in the application, it is found that the continuous heating of the electric heater can cause the fluid of the internal electric heating device to form stability, i.e. the fluid does not flow or flows little, or the flow is stable, so that the vibration performance of the coil is greatly weakened, thereby affecting the descaling of the coil and the heating efficiency, and for this reason, the inventor researches and develops a new water heater capable of generating periodic or temperature pressure vibration, and has already made patent application.
However, in practice it has been found that by varying the vibration of the tube bundle either constantly or periodically in dependence on the temperature and pressure, hysteresis can occur and the cycle can be too long or too short. Therefore, the invention improves the previous application and intelligently controls the vibration, so that the fluid in the fluid can realize frequent vibration, and good descaling and heating effects can be realized.
In the prior application, a heating method of a heater is studied, but the degree of intellectualization is not high, and remote control cannot be realized.
Disclosure of Invention
The invention provides an electric heating boiler with a novel heating device, aiming at the defects of a steam boiler in the prior art. This boiler can carry out long-range portable intelligent control according to the parameter, improves heat utilization effect and scale removal effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a steam boiler capable of remotely controlling liquid level difference to switch heating comprises an electric heating device and a steam drum, wherein the electric heating device is arranged in the steam drum, the steam drum comprises a water inlet pipe and a steam outlet, the electric heating device comprises a first pipe box, a second pipe box and a coil pipe, the coil pipe is communicated with the first pipe box and the second pipe box to form closed circulation of heating fluid, and an electric heater is arranged in the first pipe box; the number of the coil pipes is one or more, each coil pipe comprises a plurality of arc-shaped pipe bundles, the central lines of the arc-shaped pipe bundles are arcs taking the first pipe box as a concentric circle, and the end parts of the adjacent pipe bundles are communicated, so that the end parts of the pipe bundles form free ends of the pipe bundles; a first electric heater and a second electric heater are respectively arranged in the first channel box and the second channel box; filling phase-change fluid in the first channel and/or the second channel; it is characterized in that a first liquid level sensing element and a second liquid level sensor are respectively arranged in the first channel box and the second channel box, the liquid level detection device is used for detecting the liquid levels of fluids in the first channel box and the second channel box, the first liquid level sensing element and the second liquid level sensing element are in data connection with the controller, the controller extracts the liquid level data of the first liquid level sensing element or the second liquid level sensor according to a time sequence, the liquid level difference or the accumulation of the liquid level difference change is obtained through the comparison of the liquid level data of the adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the accumulated data of the temperature difference or the temperature difference change to the cloud server, and then the accumulated data is transmitted to the client through the cloud server, a user can select an automatic control or manual control working mode at the client, and the controller controls heating according to the working mode selected by the user.
Preferably, in a manual control working mode, a user obtains temperature difference or accumulated data of temperature difference changes according to a client, a control signal is manually input into the client, the control signal is transmitted to the central controller through the cloud server, and the central controller controls heating according to the signal input by the client.
Preferably, in the automatic control operation mode, the controller controls the first electric heater and the second electric heater to alternately heat when the threshold value is lower.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, if the temperature of the first temperature sensor in the previous period is T1 and the temperature of the adjacent subsequent period is T2, if T1 is T2, the heating is judged according to the following conditions:
if the temperature T1 is higher than the temperature of the first data and is lower than the threshold value, the controller controls the first electric heater to stop heating and the second electric heater to heat; wherein the first data is greater than the temperature of the phase change fluid after the phase change occurs; if the temperature of the second data is less than or equal to T1, when the temperature is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat;
when the second electric heater heats and the first electric heater does not heat, if the temperature of the second temperature sensor in the previous time period is T1, the temperature of the second temperature sensor in the next subsequent time period is T2, and if T1 is T2, the heating is judged according to the following conditions:
If the T1 is greater than the temperature of the first data and is lower than the threshold value, the controller controls the second electric heater to stop heating, and the first electric heater heats; if the temperature of the second data is less than or equal to T1, when the temperature is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat;
the first data is temperature data in a fully heated state, and the second data is temperature data in which heating is not performed or heating is started.
The invention has the following advantages:
1. according to the invention, through improving the prior art, the automatic control of the heater by accumulation of the liquid level difference or the change of the liquid level difference is realized through cloud control, the energy is saved, the best efficiency is achieved, the intellectualization of a heat exchange system is improved, and the remote portable monitoring is realized.
2. The electric heating device can judge that the evaporation of the internal fluid is basically saturated and the volume of the internal fluid is not changed greatly through the liquid level difference by the liquid level difference or the accumulated liquid level difference before and after the liquid level sensing element detects, under the condition, the internal fluid is relatively stable, the vibration of the tube bundle is reduced, and therefore adjustment is needed to be carried out, the tube bundle is vibrated, and heating is switched. Causing the fluid to undergo a change in direction to effect vibration. The stable state of the fluid is judged according to the liquid level difference or the accumulation of the change of the liquid level difference, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.
3. The invention designs a layout of an electric heating device with a novel structure in a steam drum, which can further improve the heating efficiency.
4. The invention increases the heating power of the coil pipe periodically and continuously and reduces the heating power, so that the heated fluid can generate the volume which is continuously in a changing state after being heated, and the free end of the coil pipe is induced to generate vibration, thereby strengthening heat transfer.
5. The invention optimizes the optimal relationship of the parameters of the coil pipe through a large amount of experiments and numerical simulation, thereby realizing the optimal heating efficiency.
Description of the drawings:
fig. 1 is a top view of an electric heating apparatus of the present invention.
Fig. 2 is a front view of the electric heating apparatus.
Fig. 3 is a schematic layout of an electric heating device arranged in a circular steam drum.
Fig. 4 is a schematic diagram of the coil arrangement.
Fig. 5 is a schematic view of a steam drum structure.
Fig. 6 is a background art drawing.
Fig. 7 is a control flow diagram.
In the figure: 1. coil pipe, 2, first pipe box, 3, free end, 4, free end, 5, inlet tube, 6, steam outlet, 7, free end, 8, second pipe box, 9, connecting point, 10, electric heating device, 11, steam pocket, 12 pipe bundles, 13 electric heater.
Detailed Description
A boiler comprising an electric heating device 10, a steam drum 11, said electric heating device 10 being arranged in the steam drum 11, said steam drum 11 comprising a water inlet tube 5 and a steam outlet 6. The steam outlet 6 is arranged at the upper part of the steam drum.
Preferably, the steam drum is of cylindrical construction.
Fig. 1 shows a top view of an electric heating apparatus 10, as shown in fig. 1, the electric heating apparatus 10 includes a first pipe box 2, a second pipe box 8 and a coil 1, the coil 1 is communicated with the first pipe box 2 and the second pipe box 8, a fluid circulates in the first pipe box 2, the second pipe box 8 and the coil 1 in a closed manner, electric heaters 131, 132 are disposed in the electric heating apparatus 10, and the electric heater 13 is used for heating the fluid in the electric heating apparatus 10 and then heating water in a steam drum by the heated fluid.
As shown in fig. 1-2, a first electric heater 131 and a second electric heater 132 are provided in the first and second header tanks 2 and 8, respectively; the first channel box 2 and/or the second channel box 8 are filled with phase-change fluid; the number of the coil pipes 1 is one or more, each coil pipe 1 comprises a plurality of circular arc-shaped pipe bundles 12, the central lines of the circular arc-shaped pipe bundles 12 are circular arcs taking the first pipe box 2 as a concentric circle, the end parts of the adjacent pipe bundles 12 are communicated, and fluid forms serial flow between the first pipe box 2 and the second pipe box 8, so that the end parts of the pipe bundles form free ends 3 and 4 of the pipe bundles; the fluid is phase-change fluid, vapor-liquid phase-change liquid, the first electric heater 131 and the second electric heater 132 are in data connection with a controller, and the controller controls the first electric heater 131 and the second electric heater 132 to switch heating.
Preferably, the first and second headers 2 and 8 are provided along a height direction.
It has been found in research and practice that continuous power-stable heating of the electric heater results in a stable fluid formation of the internal electric heating means, i.e. the fluid is not flowing or has little fluidity, or the flow is stable, resulting in a greatly reduced vibrational performance of the coil 1, thereby affecting the efficiency of descaling and heating of the coil 1. There is therefore a need for an improvement to the electrical heating coil described above as follows.
In the inventor's prior application, a periodic heating manner is proposed, in which the electric heaters 131 and 132 in the first and second tube boxes are continuously switched to heat by the periodic heating manner, so as to continuously promote the vibration of the coil, thereby improving the heating efficiency and the descaling effect. However, adjusting the vibration of the tube bundle with a fixed periodic variation can lead to hysteresis and too long or too short a period. Therefore, the invention improves the previous application and intelligently controls the vibration, so that the fluid in the fluid can realize frequent vibration, and good descaling and heating effects can be realized.
The invention provides a novel electric heating boiler capable of intelligently controlling vibration, aiming at the defects in the technology studied in advance. This boiler can improve heating efficiency to realize fine scale removal and heating effect.
Vibration adjustment by automatically switching heating components based on pressure difference
Preferably, a first pressure sensor and a second pressure sensor are respectively arranged in the first channel box 2 and the second channel box 8 and used for detecting pressures in the first channel box and the second channel box, the first pressure sensor and the second pressure sensor are in data connection with a controller, the controller extracts measured pressure data of the first pressure sensor or the second pressure sensor according to a time sequence, pressure difference or accumulation of pressure difference change is obtained through comparison of the pressure data of adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the accumulated data of the pressure difference or the pressure difference change to the cloud server and then transmits the accumulated data to the client through the cloud server, the client is a mobile phone, the mobile phone is provided with an APP program, and a user can select an automatic control or manual control working mode at the client, the controller controls the heating according to the operating mode selected by the control client.
Preferably, in the manual control working mode, the user obtains accumulated data of the pressure difference or the pressure difference change according to the client, a control signal is manually input at the client, and then the control signal is transmitted to the central controller through the cloud server, and the central controller controls heating according to the signal input by the client.
According to the invention, the heater is automatically controlled through the accumulation of the pressure difference or the pressure difference change by the mobile phone APP client and the controller, so that the energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.
Preferably, in the automatic control operation mode, the controller controls the first electric heater 131 and the second electric heater 132 to alternately perform heating when the threshold value is lower.
Preferably, when the first electric heater heats and the second electric heater does not heat, the pressure detected by the first pressure sensing element is controlled by the controller to stop heating and heat the second electric heater if the pressure in the previous time period is P1 and the pressure in the next time period is P2, and if P1< P2, the values of P2-P1 are lower than the threshold value; when the second electric heater heats and the first electric heater does not heat, the pressure detected by the second pressure sensing element is P1 if the pressure in the previous time period is P1 and the pressure in the next time period is P2, and if P1< P2, the numerical value of P2-P1 is lower than the threshold value, the controller controls the second electric heater to stop heating and the first electric heater to heat.
Preferably, P1 and P2 are higher than the pressure of the phase-change fluid after the phase-change, and preferably higher than or equal to 0.9 times the pressure at which the phase-change fluid undergoes a sufficient phase change. At this time, it is judged whether or not the phase change fluid is sufficiently heated.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so that the fluid in the electric heater is ensured to be fully subjected to phase change.
The pressure difference of the successive time periods detected by the pressure sensing element can basically saturate the evaporation of the fluid in the first channel or the second channel under the condition of meeting a certain pressure, and the volume of the internal fluid is not changed greatly. Therefore, the new electric heater is started to perform alternate heating by detecting the change of the pressure difference in the first channel box and the second channel box, and the heating effect and the descaling effect are increased.
The stable state of the fluid is judged according to the pressure difference or the accumulation of the pressure difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.
The current first electric heater and the current second electric heater are determined to be in a heating state or a non-heating state through sequential pressure size judgment, and therefore the running state of the first electric heater and the running state of the second electric heater are determined according to different situations.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, if the pressure of the first pressure sensor in the previous period is P1 and the pressure of the adjacent subsequent period is P2, if P1 is P2, the heating is judged according to the following conditions:
if the pressure of the P1 is greater than the pressure of the first data, and the pressure is lower than the threshold value, the controller controls the first electric heater to stop heating, and the second electric heater to start heating. Wherein the first data is greater than the pressure of the phase-change fluid after the phase change; preferably the first data is 0.9 times the pressure at which the phase change fluid substantially changes phase;
if the pressure of the second data is less than or equal to P1, when the pressure is lower than the threshold value, the controller controls the first electric heater to continue heating, and the second electric heater does not heat; wherein the second data is 1.1 times the pressure at which the phase change fluid does not undergo a phase change.
Preferably, when the first electric heater does not perform heating and the second electric heater performs heating, if the pressure of the second pressure sensor in the previous time period is P1 and the pressure of the second pressure sensor in the next following time period is P2, if P1 is P2, the heating is judged according to the following conditions:
If the pressure of the P1 is greater than the pressure of the first data, and the pressure is lower than the threshold value, the controller controls the second electric heater to stop heating, and the first electric heater starts heating. Wherein the first data is greater than the pressure of the phase-change fluid after the phase change; preferably the first data is 0.9 times the pressure at which the phase change fluid substantially changes phase;
if the pressure of the second data is less than or equal to P1, when the pressure is lower than the threshold value, the controller controls the second electric heater to continue heating, and the first electric heater does not heat; wherein the second data is 1.1 times the pressure at which the phase change fluid does not undergo a phase change.
The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. The judgment of the pressure is also used for determining whether the current electric heater is in a heating state or a non-heating state, so that the operation state of the electric heater is determined according to different conditions.
Preferably, n pressure sensing elements are arranged in the first pipe box 2 or the second pipe box 8, and the pressure P in the current time period is calculated sequentiallyiPressure Q of the preceding periodi-1Difference D ofi＝Pi-Qi-1And for n pressure differences DiPerforming arithmetic cumulative summation
Figure BDA0002531397520000061
When the value of Y is lower than the set threshold value, the controller controls the first electric heater and the second electric heater to heat or not heat according to the value of Y.
When the first electric heater heats and the second electric heater does not heat, the controller calculates Y according to the data measured by the first pressure sensing element, preferably, when Y is greater than 0, and is lower than a threshold value, the controller controls the first electric heater to stop heating and the second electric heater to start heating; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, the controller calculates Y according to the data measured by the second pressure sensing element, preferably, when Y is greater than 0, and is lower than the threshold value, the controller controls the second electric heater to stop heating and the first electric heater to start heating. If Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a just heating state through sequential pressure size judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, the period of time during which the pressure is measured is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 100-1000 Pa, preferably 500 Pa.
Preferably, the pressure value may be an average pressure value over a period of the time period. The pressure at a certain moment in time may also be used. For example, preferably both are pressures at the end of the time period.
Secondly, automatically switching a heating component to adjust vibration based on temperature difference
Preferably, a first temperature sensor and a second temperature sensor are respectively arranged in the first channel box 2 and the second channel box 8 and used for detecting the temperature in the first channel box and the second channel box, the first temperature sensor and the second temperature sensor are in data connection with a controller, the controller extracts the temperature data of the first temperature sensor or the second temperature sensor according to a time sequence, the temperature difference or the accumulation of the temperature difference change is obtained through the comparison of the temperature data of adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the accumulated temperature difference or the temperature difference change data to the cloud server and then transmits the accumulated temperature difference or the temperature difference change data to the client through the cloud server, the client is a mobile phone, the mobile phone is provided with an APP program, and a user can select an automatic control or manual control working mode at the client, the controller controls the heating according to the operating mode selected by the control client.
Preferably, in a manual control working mode, a user obtains temperature difference or accumulated data of temperature difference changes according to a client, a control signal is manually input into the client, the control signal is transmitted to the central controller through the cloud server, and the central controller controls heating according to the signal input by the client.
According to the invention, through the mobile phone APP client side and the controller, the heater is automatically controlled through the temperature difference or the accumulated temperature difference change, so that the energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.
Preferably, in the automatic control operation mode, the controller controls the first electric heater 131 and the second electric heater 132 to alternately perform heating when the threshold value is lower.
Through the temperature difference or the accumulated temperature difference of the preceding and following time periods detected by the temperature sensing element, the evaporation of the fluid inside can be judged to be basically saturated through the temperature difference, and the volume of the fluid inside is basically not changed much. So that the fluid undergoes a flow change to thereby effect vibration.
The stable state of the fluid is judged according to the temperature difference or the accumulation of the temperature difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, the controller controls the first electric heater to stop heating and the second electric heater to perform heating if the temperature detected by the first temperature sensing element is T1 in the previous period and the temperature in the adjacent subsequent period is T2, and if T1< T2, the temperature is lower than a threshold value, and at this time, preferably, T1 and T2 are greater than or equal to the temperature of the phase-change fluid after the phase-change fluid has undergone phase-change, and at this time, whether the phase-change fluid has been sufficiently heated is determined. If T1> T2, the controller controls the first electric heater to heat and the second electric heater to not heat when the threshold value is lower.
Preferably, when the second electric heater heats and the first electric heater does not heat, the controller controls the second electric heater to stop heating if the temperature detected by the second temperature sensing element is T1 in the previous period and T2 in the next period, and if T1< T2, the temperature is lower than a threshold value, and when the first electric heater heats, preferably, T1 and T2 are greater than or equal to the temperature of the phase-change fluid after the phase-change fluid changes, and whether the phase-change fluid is sufficiently heated is determined. If T1> T2, the controller controls the second electric heater to heat and the first electric heater does not heat when the threshold value is lower.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so as to ensure that the fluid in the electric heater fully carries out phase change.
The current electric heater is determined to be in a heating state, a full heating period or a just heating period through sequential temperature judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, if the temperature of the first temperature sensor in the previous time period is T1 and the temperature of the first temperature sensor in the next subsequent time period is T2, if T1 is T2, the heating is judged according to the following conditions:
if the temperature T1 is higher than the temperature of the first data and is lower than the threshold value, the controller controls the first electric heater to stop heating and the second electric heater to heat; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase; if T1 is less than or equal to the temperature of the second data, which is less than or equal to the temperature at which the phase change fluid does not change, and is lower than the threshold value, the controller controls the first electric heater to heat and the second electric heater to not heat.
Preferably, when the second electric heater performs heating and the first electric heater does not perform heating, if the temperature of the second temperature sensor in the previous period is T1 and the temperature of the second temperature sensor in the next subsequent period is T2, if T1 is T2, the heating is judged according to the following conditions:
if the temperature T1 is higher than the temperature of the first data and is lower than the threshold value, the controller controls the second electric heater to stop heating, and the first electric heater carries out heating; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase; if T1 is equal to or lower than the temperature of the second data, which is equal to or lower than the temperature at which the phase change of the phase-change fluid does not occur, and the temperature is lower than the threshold value, the controller controls the second electric heater to heat and the first electric heater not to heat.
The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. The above-mentioned temperature determination also determines whether the current electric heater is in a sufficient heating state or a just-heated state, and determines the operation state of the electric heater according to different situations.
Preferably, n first temperature sensing elements or n second temperature sensing elements are arranged in the first tube box 2 or the second tube box 8, and the temperature T of the current time period is calculated sequentiallyiTemperature Q of the preceding time periodi-1Difference D ofi＝Ti-Qi-1And for n temperature differences DiPerforming arithmetic cumulative summation
Figure BDA0002531397520000091
When the value of Y is lower than the set threshold value, the controller controls the first electric heater and the second electric heater to heat or not heat according to the value of Y.
When the first electric heater heats and the second electric heater does not heat, the controller calculates Y according to the temperature data measured by the first temperature sensing element, preferably, when Y is greater than 0, and is lower than a threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, the controller calculates Y according to the temperature data measured by the second temperature sensing element, preferably, when Y is greater than 0, and is lower than a threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a heating state just beginning through sequential temperature size judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if Y is 0, heating is judged according to the following:
when the first electric heater is used for heating and the second electric heater is not used for heating, the temperature data measured by the first temperature sensing element of the controller is calculated, if T isiIf the arithmetic mean of the first data is higher than the temperature of the first data, the controller controls the first electric heater not to heat and the second electric heater to heat when the arithmetic mean of the first data is lower than the threshold; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the temperature at which the phase change fluid substantially changes phase;
if T isiIs less than the temperature of the second data, the controller controls the first electric heater to heat and the second electric heater to not heat when the temperature of the second data is less than the threshold value, wherein the second data is less than or equal to the temperature at which the phase change of the phase change fluid does not occur.
When the second electric heater is heating and the first electric heater is not heating, the controller calculates the temperature data measured by the second temperature sensing element, if T is iWhen the arithmetic mean of the first data is higher than the temperature of the first data and is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; wherein the first data is greater than the temperature of the phase change fluid after the phase change occurs; preferably the temperature at which the phase change fluid substantially changes phase;
if T isiIs less than the temperature of the second data, the controller controls the second electric heater to heat when the temperature is lower than the threshold value, and the first electric heater does not heat, wherein the second data is less than or equal to the temperature at which the phase change fluid does not change phase.
The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. The above-mentioned temperature determination also determines whether the current electric heater is in a sufficient heating state or in a heating state just started, and determines the operation state of the electric heater according to different situations.
Preferably, the period of time for measuring the temperature is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-10 degrees Celsius, preferably 4 degrees Celsius.
Preferably, the temperature value may be an average temperature value over a period of the time period. The temperature at a certain moment in time may also be used. For example, preferably both are temperatures at the end of the time period.
Third, adjust vibration based on liquid level difference is from autonomy switching heating element
Preferably, a first liquid level sensing element and a second liquid level sensor are respectively arranged in the first channel box and the second channel box and used for detecting liquid levels of fluids in the first channel box and the second channel box, the first liquid level sensing element and the second liquid level sensing element are in data connection with a controller, the controller extracts liquid level data of the first liquid level sensing element or the second liquid level sensor according to a time sequence, accumulation of liquid level difference or liquid level difference change is obtained through comparison of the liquid level data of adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the accumulation data of the liquid level difference or the liquid level difference change to the cloud server, the accumulation data are transmitted to the client through the cloud server, the client is a mobile phone, an APP program is installed on the mobile phone, and a user can select an automatic control or manual control working mode at the client, the controller controls the heating according to the operating mode selected by the control client.
Preferably, in a manual control working mode, a user obtains accumulated data of the liquid level difference or the change of the liquid level difference according to the client, a control signal is manually input at the client, and then the control signal is transmitted to the central controller through the cloud server, and the central controller controls heating according to the signal input by the client.
According to the invention, through the mobile phone APP client side and the controller, the heater is automatically controlled through accumulation of the liquid level difference or the change of the liquid level difference, so that the energy is saved, the best efficiency is achieved, the intellectualization of a heat exchange system is improved, and the remote portable monitoring is realized.
Preferably, in the automatic control operation mode, the controller controls the first electric heater 131 and the second electric heater 132 to alternately perform heating when the threshold value is lower.
Through the liquid level difference of the front time and the back time or the accumulated liquid level difference detected by the liquid level sensing element, the evaporation of the internal fluid can be judged to be basically saturated through the liquid level difference, and the volume of the internal fluid is basically not changed greatly. Causing the fluid to undergo a change in direction to effect vibration.
The stable state of the fluid is judged according to the liquid level difference or the accumulation of the change of the liquid level difference, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.
Preferably, when the first electric heater heats and the second electric heater does not heat, the liquid level detected by the first liquid level sensing element is preferably controlled by the controller not to heat and the second electric heater heats if the liquid level in the previous time period is L1 and the liquid level in the next time period is L2, and if L1> L2, the liquid level is lower than the threshold value; in this case, it is preferable that L1 and L2 are not more than the liquid level of the phase-change fluid after the phase change, and it is determined whether or not the phase-change fluid is sufficiently heated. If L1< L2, then below the threshold, the controller controls the first electric heater to heat and the second electric heater to not heat.
Preferably, when the first electric heater does not perform heating and the second electric heater performs heating, the liquid level detected by the second liquid level sensing element is preferably controlled by the controller not to perform heating and the first electric heater performs heating if the liquid level in the previous time period is L1 and the liquid level in the adjacent subsequent time period is L2 and if L1> L2 is lower than a threshold value; at this time, it is preferable that TL1 and L2 be equal to or less than the liquid level of the phase-change fluid after the phase change, and at this time, it is determined whether or not the phase-change fluid is sufficiently heated. If L1< L2, then below the threshold, the controller controls the second electric heater to heat and the first electric heater does not heat.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so as to ensure that the fluid in the electric heater fully carries out phase change.
The current electric heater is determined to be in a sufficient heating state or a heating state just beginning through sequential liquid level judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if the liquid level of the preceding period is L1, the liquid level of the adjacent succeeding period is L2, and if L1 is L2, heating is judged according to the following:
When the first electric heater heats and the second electric heater does not heat, the liquid level detected by the first liquid level sensing element is lower than a threshold value if L1 is smaller than the liquid level of the first data or L1 is 0, the controller controls the first electric heater not to heat and the second electric heater to heat; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed; if L1 is greater than or equal to the level of the second data, which is less than or equal to the level at which the phase change fluid does not undergo phase change, and is lower than the threshold value, the controller controls the first electric heater to heat and the second electric heater to not heat.
When the second electric heater heats and the first electric heater does not heat, the liquid level detected by the second liquid level sensing element is lower than the threshold value if L1 is smaller than the liquid level of the first data or L1 is 0, the controller controls the second electric heater not to heat and the first electric heater heats; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed; and if the L1 is greater than or equal to the liquid level of the second data, the controller controls the second electric heater to heat and the first electric heater to not heat when the L1 is lower than the threshold value, wherein the second data is less than or equal to the liquid level at which the phase-change fluid does not change phase.
The first data is liquid level data in a fully heated state, including liquid level of dry-out, and the second data is liquid level data of no heating or beginning heating. Through the judgment of the liquid level, whether the current electric heater is in a heating state or a non-heating state is also determined, so that the operation state of the electric heater is determined according to different conditions.
Preferably, n liquid level sensing elements are arranged in the first channel box 2 or the second channel box 8, and the liquid level L in the current time period is calculated in sequenceiWith the liquid level Q of the preceding periodi-1Difference D ofi＝Li-Qi-1And for n liquid level differences DiPerforming arithmetic cumulative summation
Figure BDA0002531397520000121
When the value of Y is lower than a set threshold value, the controller controls the first electric heater and the second electric heater to heat or not heat.
When the first electric heater heats and the second electric heater does not heat, the liquid level detected by the first liquid level sensing element is preferably Y >0, and if Y is less than a threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, the liquid level detected by the second liquid level sensing element is preferably Y >0, and if Y is less than the threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a just heating state through the sequential liquid level judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if Y is 0, heating is judged according to the following:
when the first electric heater is used for heating and the second electric heater is not used for heating, the liquid level detected by the first liquid level sensing element is LiIf the arithmetic mean of the first data is less than the liquid level of the first data or 0, the controller controls the first electric heater not to heat and the second electric heater to heat when the arithmetic mean of the first data and the second data is lower than the threshold value; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably a level at which the phase change fluid is substantially phase-changed; if L isiIf the arithmetic mean of the first data and the second data is larger than the liquid level of the second data, the controller controls the first electric heater to heat and the second electric heater to not heat when the arithmetic mean of the first data and the second data is lower than the threshold value, wherein the second data is smaller than or equal to the liquid level at which the phase change fluid does not change phase.
When the second electric heater is used for heating and the first electric heater is not used for heating, the liquid level detected by the second liquid level sensing element is LiIf the arithmetic mean of the first data is less than the liquid level of the first data or 0, the controller controls the second electric heater not to heat and the first electric heater to heat when the arithmetic mean of the first data is less than the threshold value; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably a level at which the phase change fluid is substantially phase-changed; if L is iIf the arithmetic mean of the first data and the second data is larger than the liquid level of the second data, the controller controls the second electric heater to heat when the arithmetic mean of the first data and the second data is lower than the threshold value, and the first electric heater does not heat, wherein the second data is smaller than or equal to the liquid level at which the phase change fluid does not change phase.
The first data is liquid level data in a fully heated state, including liquid level of dry-out, and the second data is liquid level data of no heating or beginning heating. The judgment of the liquid level also determines whether the current electric heater is in a sufficient heating state or a just heating state, so that the running state of the electric heater is determined according to different conditions.
Preferably, the period of time for which the measurement is also made is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-10 mm, preferably 4 mm.
Preferably, the water level value may be an average water level value over a period of the time period. The water position at a certain moment in time may also be used. Such as preferably both water levels at the end of the time period.
Adjusting vibration based on speed automatic switching heating component
Preferably, a speed sensing element is arranged inside the free end of the tube bundle and used for detecting the flow velocity of fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, the controller extracts speed data according to a time sequence, the speed data in adjacent time periods are compared to obtain the speed difference or the accumulation of the speed difference change, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits the accumulated speed data of the speed difference or the speed difference change to the cloud server and then transmits the accumulated speed data to the client through the cloud server, the client is a mobile phone, an APP program is installed on the mobile phone, a user can select an automatic control or manual control working mode at the client, and the controller controls heating according to the working mode selected by the control client.
Preferably, in a manual control working mode, a user obtains the speed difference or the accumulated data of the speed difference change according to the client, a control signal is manually input at the client, and then the control signal is transmitted to the central controller through the cloud server, and the central controller controls heating according to the signal input by the client.
According to the invention, through the mobile phone APP client side and the controller, the heater is automatically controlled through the speed difference or the accumulated speed difference change, so that the energy is saved, the best efficiency is achieved, the intellectualization of the heat exchange system is improved, and the remote portable monitoring is realized.
Preferably, in the automatic control operation mode, the controller controls the first electric heater 131 and the second electric heater 132 to alternately perform heating when the threshold value is lower.
In this case, the internal fluid is relatively stable, and the tube bundle vibration is poor, and therefore, it is necessary to adjust the tube bundle vibration to switch the heating member. So that the fluid undergoes a change in flow direction and a change in volume to effect vibration.
The stable state of the fluid is judged according to the speed difference or the accumulation of the speed difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.
When the first electric heater performs heating and the second electric heater does not perform heating, preferably, if the speed of the previous time period is V1 and the speed of the adjacent subsequent time period is V2, and if V1< V2, the speed is lower than the threshold value, the controller controls the first electric heater not to perform heating and the second electric heater to perform heating; if V1> V2, the controller controls the first electric heater to heat and the second electric heater to not heat when the threshold value is lower.
When the second electric heater heats and the first electric heater does not heat, preferably, if the speed of the previous time period is V1 and the speed of the adjacent subsequent time period is V2, and if V1< V2, the speed is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; if V1> V2, the controller controls the second electric heater to heat and the first electric heater to not heat when the threshold value is lower.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so as to ensure that the fluid in the electric heater fully carries out phase change.
The current electric heater is determined to be in a sufficient heating state or a just heating state through the sequential speed judgment, so that the running states of different electric heaters are determined according to different conditions.
Preferably, if the speed of the preceding time period is V1, the speed of the adjacent following time period is V2, and if V1 is V2, heating is judged according to the following:
when the first electric heater heats and the second electric heater does not heat, if the speed of V1 is higher than the speed of the first data and is lower than the threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the first data is the speed at which the phase change fluid is substantially phase changed; if the speed of V1 is less than or equal to the speed of the second data, the controller controls the first electric heater to heat and the second electric heater to not heat when the speed is less than the threshold value, wherein the speed of the second data is less than or equal to the speed at which the phase change fluid does not change phase.
When the second electric heater heats and the first electric heater does not heat, if the speed of V1 is higher than the speed of the first data and is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the first data is the speed at which the phase change fluid is substantially phase changed; if the speed of V1 is less than or equal to the speed of the second data, the speed of the second data is less than or equal to the speed of the phase-change fluid which does not change phase, the controller controls the second electric heater to heat when the speed of the second data is less than the threshold value, and the first electric heater does not heat.
The first data is speed data of a sufficient heating state, and the second data is speed data of no heating or heating beginning. The above determination of the speed is also used to determine whether the current electric heater is in a fully heated state or a just heated state, so as to determine the operation state of the electric heater according to different situations.
Preferably, the number of the speed sensing elements is n, and the speed V of the current time period is calculated in sequenceiAnd the previous time speed Qi-1Difference D ofi＝Vi-Qi-1And for n speed differences DiPerforming arithmetic cumulative summation
Figure BDA0002531397520000141
When the value of Y is lower than the set thresholdWhen the value is positive, the controller controls the electric heater to stop heating or continue heating.
When the first electric heater heats and the second electric heater does not heat, preferably, when Y is greater than 0 and is lower than the threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, preferably, when Y is greater than 0 and is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a just heating state through the judgment of the speed, so that the running state of the electric heater is determined according to different conditions.
Preferably, if Y is 0, heating is judged according to the following:
when the first electric heater is heating and the second electric heater is not heating, if V isiIf the arithmetic mean of the first and second data is higher than the speed of the first data, the controller controls the first electric heater not to heat and the second electric heater to heat when the arithmetic mean of the first and second data is lower than the threshold; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the rate at which the phase change fluid changes phase substantially; if ViIs less than the speed of the second data, the controller controls the first electric heater to heat and the second electric heater to not heat when the speed of the second data is less than the speed of the second electric heater, wherein the second data is less than or equal to the speed at which the phase change of the phase change fluid does not occur.
When the second electric heater is heating and the first electric heater is not heating, if V isiIf the arithmetic mean of the first data is higher than the speed of the first data, the controller controls the second electric heater not to heat and the first electric heater to heat when the arithmetic mean of the first data is lower than the speed of the first data; wherein the first data is greater than the phase The speed of the phase-change fluid after phase change; preferably the rate at which the phase change fluid substantially changes phase; if ViIs less than the speed of the second data, the controller controls the second electric heater to heat when the speed is lower than the threshold value, and the first electric heater does not heat, wherein the second data is less than or equal to the speed at which the phase change fluid does not change phase.
The first data is speed data of a sufficiently heated state, and the second data is speed data of no heating or heating just started. The judgment of the speed is also used for determining whether the current electric heater is in a heating state or a non-heating state, so that the operation state of the electric heater is determined according to different conditions.
Preferably, the period of time for measuring the speed is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-3 m/s, preferably 2 m/s.
Preferably, the speed value may be an average pressure value over a period of the time period. The speed at a certain moment in time may also be used. For example, preferably both are speeds at the end of the time period.
Preferably, the speed sensing element is disposed at the free end. Through setting up at the free end, can perceive the speed change of free end to realize better control and regulation.
Preferably, the pipe diameter of the first pipe box 2 is equal to that of the second pipe box 8. The pipe diameters of the first pipe box and the second pipe box are equal, so that the fluid can be ensured to be subjected to phase change in the first box body and keep the same transmission speed as the second pipe box.
Preferably, the connection position 9 of the coil pipe at the first header is lower than the connection position of the second header and the coil pipe. This ensures that steam can rapidly enter the second header upwards.
Preferably, the bottom parts of the first channel box and the second channel box are provided with return pipes, so that the fluid condensed in the first channel box and the second channel box can quickly flow.
Preferably, the first and second headers are arranged in a height direction, the coil pipe is provided in plural numbers in the height direction of the first header, and a pipe diameter of the coil pipe is gradually reduced from top to bottom.
Preferably, the pipe diameter of the coil pipe is gradually decreased and gradually increased along the direction from the top to the bottom of the first pipe box.
The pipe diameter range through the coil pipe increases, can guarantee that more steam passes through upper portion and gets into first, two boxes, guarantees that the distribution of steam is even in all coil pipes, further reinforces the heat transfer effect for the whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.
Preferably, the number of the coil pipes is plural along the height direction of the first header, and the distance between the adjacent coil pipes is increased from the top to the bottom.
Preferably, the distance between the coils increases along the height direction of the first header.
The interval range through the coil pipe increases, can guarantee that more steam passes through upper portion and gets into first, two boxes, guarantees that the distribution of steam is even in all coil pipes, further strengthens heat transfer effect for the whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.
Preferably, as shown in fig. 7, the steam drum is a drum with a circular cross section, and a plurality of electric heating devices are arranged in the steam drum.
Preferably, as shown in fig. 7, one of the plurality of electric heating devices disposed in the steam drum is disposed at the center of the steam drum to become a central electric heating device, and the others are distributed around the center of the steam drum to become peripheral electric heating devices. Through the structural design, the fluid in the steam pocket can fully achieve the vibration purpose, and the heat exchange effect is improved.
Preferably, the heating power of the single peripheral electric heating means is smaller than the heating power of the central electric heating means. Preferably, the heating power of the individual peripheral electric heating means is 0.6-0.9 times, preferably 0.75 times, the heating power of the central electric heating means. Through such design for the center reaches bigger vibration frequency, forms central vibration source, thereby influences all around, reaches better enhancement heat transfer and scale removal effect.
Preferably, on the same horizontal heat exchange section, the fluid needs to achieve uniform vibration, and uneven heat exchange distribution is avoided. It is therefore necessary to distribute the amount of heating power among the different electric heating devices reasonably. Experiments show that the heating power ratio of the central electric heating device to the peripheral tube bundle electric heating device is related to two key factors, wherein one of the two key factors is the distance between the peripheral electric heating device and the center of the steam drum (namely the distance between the circle center of the peripheral electric heating device and the circle center of the central electric heating device) and the diameter of the steam drum. Therefore, the invention optimizes the optimal proportional distribution of the pulsating flow according to a large number of numerical simulations and experiments.
Preferably, the radius of the inner wall of the steam drum is B, the center of the central electric heating device is arranged at the center of the circular section of the steam drum, the distance from the center of the peripheral electric heating device to the center of the circular section of the steam drum is S, the centers of adjacent peripheral electric heating devices are respectively connected with the center of the circular section, the included angle formed by the two connecting lines is a, the heating power of the peripheral electric heating device is W2, and the heating power of a single central electric heating device is W1, so that the following requirements are met:
W1/W2 ═ a-B Ln (B/S); ln is a logarithmic function;
a, b are coefficients, where 1.9819< a <1.9823,0.5258< b < 0.5264;
1.25<B/S<2.1；
1.6<W1/W2<1.9。
wherein 35 ° < a <80 °.
Preferably, the number of the four-side distribution is 4-5.
Preferably, B is 1600-2400 mm, preferably 2000 mm; s is 1200-2000 mm, preferably 1700 mm; the diameter of the heat exchange tube is 12-20 mm, preferably 16 mm; the outermost diameter of the pulsating coil is 300-. The diameter of the riser is 100-116 mm, preferably 108 mm, the height of the riser is 1.8-2.2 m, preferably 2 m, and the spacing between adjacent pulse tubes is 65-100 mm. Preferably around 80 mm.
The total heating power is preferably 6000-14000W, and more preferably 7500W.
More preferably, a is 1.9821 and b is 0.5261.
The steam outlet is arranged in the middle of the upper wall of the steam drum.
Preferably, the box body has a circular cross section, and is provided with a plurality of electric heating devices, wherein one electric heating device is arranged at the center of the circular cross section and the other electric heating devices are distributed around the center of the circular cross section.
The coils 1 are in one or more groups, each group of coils 1 comprises a plurality of circular arc-shaped tube bundles 12, the central lines of the circular arc-shaped tube bundles 12 are circular arcs of concentric circles, and the ends of the adjacent tube bundles 12 are communicated, so that the ends of the coils 1 form tube bundle free ends 3, 4, such as the free ends 3, 4 in fig. 2.
Preferably, the heating fluid is a vapor-liquid phase-change fluid.
Preferably, the first header 2, the second header 8, and the coil 1 are all of a circular tube structure.
Preferably, the tube bundle of the coil 1 is an elastic tube bundle.
The heat exchange coefficient can be further improved by arranging the tube bundle of the coil 1 with an elastic tube bundle.
Preferably, the concentric circles are circles centered on the center of the first header 2. I.e. the tube bundle 12 of the coil 1 is arranged around the centre line of the first tube box 2.
As shown in fig. 4, the tube bundle 12 is not a complete circle, but rather leaves a mouth, thereby forming the free end of the tube bundle. The angle of the arc of the mouth part is 65-85 degrees, namely the sum of included angles b and c in figure 5 is 65-85 degrees.
Preferably, the ends of the tube bundle on the same side are aligned in the same plane, with the extension of the ends (or the plane in which the ends lie) passing through the median line of the first tube box 2.
Further preferably, the electric heater 13 is an electric heating rod.
Preferably, the first end of the inner tube bundle of the coil 1 is connected to the first tube box 2, the second end is connected to one end of the adjacent outer tube bundle, one end of the outermost tube bundle of the coil 1 is connected to the second tube box 8, and the ends of the adjacent tube bundles are connected to form a serial structure.
The plane in which the first end is located forms an angle c of 40-50 degrees with the plane in which the centre lines of the first and second headers 2, 8 are located.
The plane of the second end forms an angle b of 25-35 degrees with the plane of the centre lines of the first and second headers 2, 8.
Through the design of the preferable included angle, the vibration of the free end is optimal, and therefore the heating efficiency is optimal.
As shown in fig. 5, there are 4 tube bundles of coil 1, with tube bundles A, B, C, D in communication. Of course, the number is not limited to four, and a plurality of the connecting structures are provided as required, and the specific connecting structure is the same as that in fig. 5.
The number of the coil pipes 1 is multiple, and the plurality of coil pipes 1 are respectively and independently connected with the first pipe box 2 and the second pipe box 8, that is, the plurality of coil pipes 1 are in a parallel structure.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (2)

1. A steam boiler capable of remotely controlling liquid level difference to switch heating comprises an electric heating device and a steam drum, wherein the electric heating device is arranged in the steam drum, the steam drum comprises a water inlet pipe and a steam outlet, the electric heating device comprises a first pipe box, a second pipe box and a coil pipe, the coil pipe is communicated with the first pipe box and the second pipe box to form closed circulation of heating fluid, and an electric heater is arranged in the first pipe box; the number of the coil pipes is one or more, each coil pipe comprises a plurality of arc-shaped pipe bundles, the central lines of the arc-shaped pipe bundles are arcs taking the first pipe box as a concentric circle, and the end parts of the adjacent pipe bundles are communicated, so that the end parts of the pipe bundles form free ends of the pipe bundles; a first electric heater and a second electric heater are respectively arranged in the first channel box and the second channel box; filling phase-change fluid in the first channel and/or the second channel; it is characterized in that a first liquid level sensor and a second liquid level sensor are respectively arranged in the first channel box and the second channel box, the liquid level detection device is used for detecting the liquid levels of fluids in the first channel box and the second channel box, the first liquid level sensor and the second liquid level sensor are in data connection with the controller, the controller extracts the liquid level data of the first liquid level sensor or the second liquid level sensor according to a time sequence, the liquid level difference or the accumulation of the liquid level difference change is obtained through the comparison of the liquid level data of the adjacent time periods, the controller is connected with a cloud server, the cloud server is connected with a client, the controller transmits accumulated data of the liquid level difference or the liquid level difference change to the cloud server and then transmits the accumulated data to the client through the cloud server, a user can select an automatic control or manual control working mode at the client, and the controller controls heating according to the working mode selected by the user; in the automatic control working mode, when the liquid level difference or the accumulated data of the change of the liquid level difference is lower than a threshold value, the controller controls the first electric heater and the second electric heater to alternately heat.
2. The boiler as claimed in claim 1, wherein when the first electric heater performs heating and the second electric heater does not perform heating, the first level sensor detects a level of liquid, which is L2 if the level of liquid in a preceding period is L1 and the level of liquid in an adjacent succeeding period is L2, and when the level of liquid is lower than a threshold value if L1> L2, the controller controls the first electric heater not to perform heating and the second electric heater to perform heating; if L1< L2, when the accumulated data of the liquid level difference or the change of the liquid level difference is lower than a threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat;
when the first electric heater does not heat and the second electric heater heats, the liquid level detected by the second liquid level sensor is L1 if the liquid level in the previous time period is L2 and the liquid level in the next subsequent time period is L3832, if L1 is greater than L2, the liquid level is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater heats; if L1< L2, the controller controls the second electric heater to heat and the first electric heater does not heat when the threshold value is lower.
CN202010519375.4A 2020-06-09 2020-06-09 Steam boiler capable of remotely controlling liquid level difference to switch heating Expired - Fee Related CN112781023B (en)

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