Fuel gas through-flow steam boiler with electric heating function

Abstract

The invention discloses a fuel gas through-flow steam boiler with an electric heating function, belongs to the technical field of steam boilers, and solves the problems that two forms of fuel gas heating and electric heating are combined in steam generation equipment of the steam boiler, and low-cost and stable steam supply is realized under the condition that heat storage equipment is not arranged. Comprising a water space allowing water to flow in and out, a combustion chamber arranged above the water space, a heat insulation barrel arranged at the top of the combustion chamber and communicated with the combustion chamber, a steam space arranged at the top of the combustion chamber and located on the outer ring of the heat insulation barrel, and a plurality of inner ring water pipes and outer ring water pipes communicating the steam space with the water space. A flange type electric heating pipe extending into the water space is arranged on the outer ring of the water space, and a gas burner communicating with the heat insulation barrel is installed at the top of the heat insulation barrel. According to the steam generating device of the steam boiler, the gas heating mode and the electric heating mode are combined in the steam generating device of the steam boiler, and under the condition that heat storage equipment is not arranged, low cost is achieved, and steam is stably supplied.

Description

Technical Field

[0001] The present invention relates to the technical field of steam boilers, and in particular to a gas-fired cross-flow steam boiler with an electric heating function. Background Art

[0002] Gas-fired through-flow steam boilers are highly efficient and compact steam generators. Water flowing through combustion-heated pipes instantly vaporizes, producing steam. With the addition of electric heating, the boiler can intelligently switch between gas and electric heating modes, allowing for complementary operation. This improves energy efficiency, reliability, and environmental friendliness, making it suitable for industrial or commercial applications requiring a stable steam supply.

[0003] Traditional gas-fired through-flow steam boilers experience reduced efficiency during periods of gas shortages or load fluctuations, and are unable to capitalize on off-peak electricity prices. Purely electric steam boilers have high energy consumption and operating costs, making them unsuitable for continuous, high-load demand. While through-flow boilers offer fast startup, they rely heavily on a single energy source and lack flexibility.

[0004] Therefore, it is necessary to combine gas heating and electric heating in the steam generating equipment of the steam boiler to achieve low-cost and stable steam supply without setting up heat storage equipment.

[0005] Therefore, a gas-fired cross-flow steam boiler with electric heating function is proposed to solve or alleviate the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a gas-fired cross-flow steam boiler with electric heating function.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A gas-fired cross-flow steam boiler with an electric heating function comprises a water space for water to flow in and out, a combustion chamber arranged above the water space, an insulating cylinder arranged at the top of the combustion chamber and connected thereto, a steam space arranged at the top of the combustion chamber and located on the outer ring of the insulating cylinder, and a plurality of inner and outer water pipes connecting the steam space and the water space. The outer ring of the water space is provided with a flange-type electric heating pipe extending therein, the top of the insulating cylinder is provided with a gas burner connected thereto, the feed end of the gas fuel machine is connected to the external gas through a gas valve, the steam space is provided with an air-equalizing orifice plate which divides it into two spaces, the top of the steam space is provided with a steam valve interface connected to the upper space, and the gas burner and the flange-type electric heating pipe are coupled together with a main controller.

[0008] Preferably, the water space is connected to a water supply valve interface and a sewage valve interface.

[0009] Preferably, the main controller is coupled to an electric, thermal and gas coordinated control system, which monitors the electric, thermal and gas coordinated control system in real time and, when it detects high-frequency, small-amplitude pressure oscillations caused by the mismatch between the start and stop of electric and thermal groups and the response speed of the gas valve in the 70-80% load range, dynamically generates a feedforward-feedback composite compensation signal, drives the gas valve to adjust after dead zone compensation and rate limitation, and realizes steam pressure control in combination with temperature adaptive adjustment and multi-mode smooth switching strategy.

[0010] Preferably, the electric, heat and gas coordinated control system includes a signal conditioning module, a time differential engine, a dual-channel analysis module, a dynamic compensation controller, and a valve control drive module; The signal output end of the signal conditioning module is connected to the first input end of the dual-channel analysis module, the differential output end of the time differential engine is connected to the second input end of the dual-channel analysis module, the RMS output end of the dual-channel analysis module is connected to the signal input end of the dynamic compensation controller, the compensation output end of the dynamic compensation controller is connected to the first input end of the valve-controlled drive module, the valve position output end of the valve-controlled drive module is connected to the control input end of the gas valve, and the gas valve is provided with a valve position sensor and a temperature sensor, the valve position sensor is connected to the feedback input end of the dynamic compensation controller, and the output end of the temperature sensor is connected to the temperature input end of the dynamic compensation controller. The main controller is coupled to the valve-controlled drive module, and the main controller is connected to the configuration input end of the time differential engine to transmit the electric heating configuration status signal.

[0011] Preferably, the signal conditioning module includes a pressure sensor provided on the steam space and with a probe extending into the steam space, an INA128P instrumentation amplifier, a first OPA2197ID operational amplifier, a second OPA2197ID operational amplifier, and an LTC1064-1CSW programmable filter, wherein the positive and negative terminals of the pressure sensor are respectively connected to the non-inverting and inverting input terminals of the INA128P instrumentation amplifier, the reference terminal of the INA128P instrumentation amplifier is grounded, the output terminal of the INA128P instrumentation amplifier is connected to the non-inverting input terminal of the first OPA2197ID operational amplifier, and the first OPA2197ID operational amplifier is connected to the positive input terminal of the first OPA2197ID operational amplifier. The non-inverting input of the A2197ID operational amplifier is connected to a capacitor and then grounded, the output of the first OPA2197ID operational amplifier is connected to the input of the LTC1064-1CSW programmable filter, the output of the LTC1064-1CSW programmable filter is connected to the non-inverting input of the second OPA2197ID operational amplifier, the output of the second OPA2197ID operational amplifier is connected to a capacitor and then grounded, the output of the second OPA2197ID operational amplifier is connected to its inverting input, and the output of the second OPA2197ID operational amplifier is connected to the dual-channel analysis module.

[0012] Preferably, the time differential engine includes an HCPL2630 optocoupler isolator, a 74HC123D monostable trigger, an AD8307ANZ logarithmic amplifier, and a 16 MHz crystal oscillator; The anode of the HCPL2630 optocoupler isolator is connected to the main controller to receive the electrothermal configuration signal, the cathode of the HCPL2630 optocoupler isolator is grounded, the power terminal of the HCPL2630 optocoupler isolator is connected to a +5V voltage, the output terminal of the HCPL2630 optocoupler isolator is connected to the input terminal of a 74HC123D monostable trigger, the ground terminal of the 74HC123D monostable trigger is grounded, the power terminal of the 74HC123D monostable trigger is connected to a +5V voltage, the 74HC123D monostable trigger is connected in parallel with a resistor and a capacitor and then grounded, the output terminal of the 74HC123D monostable trigger is connected to the input terminal of an AD8307ANZ logarithmic amplifier, the output terminal of the AD8307ANZ logarithmic amplifier is connected to a dual-channel analysis module as a differential output terminal, and the 16 MHz crystal oscillator is connected to the clock input terminal of the 74HC123D monostable trigger.

[0013] Preferably, the dual-channel analysis module includes a first AD633 analog multiplier, a second AD633 analog multiplier, a third OPA2197ID operational amplifier, and an RMS converter AD736JRZ; The input end of the first AD633 analog multiplier is connected to the output end of the signal conditioning module, the output end of the first AD633 analog multiplier is connected to the input end of the third OPA2197ID operational amplifier, the input end of the second AD633 analog multiplier is connected to the output end of the time differential engine, the output end of the second AD633 analog multiplier is connected to the input end of the third OPA2197ID operational amplifier, the output end of the third OPA2197ID operational amplifier is connected to the input end of the RMS converter AD736JRZ, and the output end of the RMS converter AD736JRZ is connected to the input end of the dynamic compensation controller.

[0014] Preferably, the dynamic compensation controller includes an AD534 analog multiplier, an INA188 instrumentation amplifier, an ADS1248IPW analog-to-digital converter, a CD4053 multiplexer, a first OPA2197IDR operational amplifier, and an X9C103S digital potentiometer; The input end of the AD534 analog multiplier is connected to the output end of the dual-channel analysis module, the other input end of the AD534 analog multiplier is connected to the output end of the INA188 instrumentation amplifier, the output end of the AD534 analog multiplier is connected to the common end of the CD4053 multiplexer, the input end of the INA188 instrumentation amplifier is connected to the output end of the valve position sensor, the output end of the CD4053 multiplexer is connected to the input end of the OPA2197IDR operational amplifier, the output end of the OPA2197IDR operational amplifier is reversely connected to its input end, the output end of the OPA2197IDR operational amplifier is connected to the input end of the X9C103S digital potentiometer, and the compensation output end of the X9C103S digital potentiometer outputs a compensation signal.

[0015] Preferably, the valve-controlled drive module includes a second OPA2197IDR operational amplifier, a third OPA2197IDR operational amplifier, a BUF634U buffer, a MOS tube, and an INA199A1 current detection amplifier; The input end of the second OPA2197IDR operational amplifier is connected to the output end of the dynamic compensation controller, the input end of the second OPA2197IDR operational amplifier is connected to the main controller, the output ends of the second OPA2197IDR operational amplifier and the third OPA2197IDR operational amplifier are connected to the input end of the BUF634U buffer, the output end of the BUF634U buffer is connected to the gate of the MOS switch, the source of the MOS tube is connected to ground after a series resistor, the drain of the MOS tube is connected to the main controller, the source of the MOS tube is connected to the input end of the INA199A1 current detection amplifier, and the output end of the INA199A1 current detection amplifier is connected to the main controller as a feedback output end.

[0016] The present invention has the following beneficial effects: The present invention can combine gas heating and electric heating in the steam generating equipment of the steam boiler, and realize low-cost and stable steam supply without setting up heat storage equipment. The electric heating and gas coordinated control system therein monitors the electric heating configuration changes and steam pressure fluctuations in real time and dynamically generates a feedforward-feedback composite compensation signal when detecting high-frequency small-amplitude pressure oscillations caused by the mismatch between the start and stop of electric heating groups and the response speed of the gas valve in the 70-80% load range. After dead zone compensation and rate limitation, the gas valve is driven for adjustment, and steam pressure control is realized by combining temperature adaptive adjustment and multi-mode smooth switching strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a structural block diagram of the electric, heat and gas coordinated control system in the present invention.

[0019] In the figure, 1. combustion chamber; 2. insulation tube; 3. gas burner; 4. water space; 5. flange-type electric heating tube; 6. water supply valve interface; 7. drain valve interface; 8. inner circle water pipe; 9. outer circle water pipe; 10. steam space; 11. air equalizing orifice plate; 12. steam valve interface; 13. signal conditioning module; 14. time differential engine; 15. dual-channel analysis module; 16. dynamic compensation controller; 17. valve control drive module; 18. main controller; 19. temperature sensor; 20. valve position sensor. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use, or are the orientation or position relationship commonly understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] A gas-fired steam boiler with electric heating function, such as Figure 1 As shown, it includes a water space 4 for water to flow in and out, a combustion chamber 1 arranged above the water space 4, an insulating tube 2 arranged at the top of the combustion chamber 1 and connected to the water space, a steam space 10 arranged at the top of the combustion chamber 1 and located at the outer circle of the insulating tube 2, and a number of inner circle water pipes 8 and outer circle water pipes 9 connecting the steam space 10 and the water space 4. The water space 4 is connected to a water supply valve interface 6 and a sewage valve interface 7. The outer circle of the water space 4 is provided with a flange-type electric heating pipe 5 extending therein. A gas burner 3 connected to the top of the insulating tube 2 is installed. The feed end of the gas fuel machine is connected to the gas through the gas valve. The steam space 10 is provided with an air-distributing orifice plate 11 that divides it into two layers of space, upper and lower. A steam valve interface 12 connected to the upper space is installed on the top of the steam space 10. The gas burner 3 and the flange-type electric heating pipe 5 are jointly coupled with a main controller 18.

[0027] The main controller 18 is coupled to an electric, thermal and gas coordinated control system. The electric, thermal and gas coordinated control system monitors the electric and thermal configuration changes and steam pressure fluctuations in real time. When it detects high-frequency, small-amplitude pressure oscillations caused by the mismatch between the start and stop of electric and thermal groups and the response speed of the gas valve in the 70-80% load range, it dynamically generates a feedforward-feedback composite compensation signal, drives the gas valve to adjust after dead zone compensation and rate limitation, and realizes steam pressure control by combining temperature adaptive adjustment and multi-mode smooth switching strategy.

[0028] like Figure 2 As shown, the electric, heat and gas coordinated control system includes a signal conditioning module 13, a time differential engine 14, a dual-channel analysis module 15, a dynamic compensation controller 16, and a valve control drive module 17; the signal output end of the signal conditioning module 13 is connected to the first input end of the dual-channel analysis module 15, the differential output end of the time differential engine 14 is connected to the second input end of the dual-channel analysis module 15, the RMS output end of the dual-channel analysis module 15 is connected to the signal input end of the dynamic compensation controller 16, the compensation output end of the dynamic compensation controller 16 is connected to the first input end of the valve control drive module 17, the valve position output end of the valve control drive module 17 is connected to the control input end of the gas valve, and the gas valve is provided with a valve position sensor 20 and a temperature sensor 19. The valve position sensor 20 is connected to the feedback input end of the dynamic compensation controller 16, and the output end of the temperature sensor 19 is connected to the temperature input end of the dynamic compensation controller 16. The main controller 18 is coupled to the valve control drive module 17 and connected to the configuration input end of the time differential engine 14 to transmit the electric and heat configuration state signal.

[0029] The signal conditioning module 13 includes a pressure sensor provided on the steam space 10 and with a probe extending into the steam space 10, an INA128P instrumentation amplifier, a first OPA2197ID operational amplifier, a second OPA2197ID operational amplifier, and an LTC1064-1CSW programmable filter. The positive and negative terminals of the pressure sensor are respectively connected to the non-inverting and inverting input terminals of the INA128P instrumentation amplifier, the reference terminal of the INA128P instrumentation amplifier is grounded, the output terminal of the INA128P instrumentation amplifier is connected to the non-inverting input terminal of the first OPA2197ID operational amplifier, and the first OP The non-inverting input of the A2197ID operational amplifier is connected to a capacitor and then grounded, the output of the first OPA2197ID operational amplifier is connected to the input of the LTC1064-1CSW programmable filter, the output of the LTC1064-1CSW programmable filter is connected to the non-inverting input of the second OPA2197ID operational amplifier, the output of the second OPA2197ID operational amplifier is connected to a capacitor and then grounded, the output of the second OPA2197ID operational amplifier is connected to its inverting input, and the output of the second OPA2197ID operational amplifier is connected to the dual-channel analysis module 15.

[0030] The time differential engine 14 includes an HCPL2630 optocoupler isolator, a 74HC123D monostable trigger, an AD8307ANZ logarithmic amplifier, and a 16MHz crystal oscillator; the anode of the HCPL2630 optocoupler isolator is connected to the main controller 18 to receive the electric heating configuration signal, the cathode of the HCPL2630 optocoupler isolator is grounded, the power terminal of the HCPL2630 optocoupler isolator is connected to the +5V voltage, and the output terminal of the HCPL2630 optocoupler isolator is connected to the input of the 74HC123D monostable trigger. The ground terminal of the 74HC123D monostable trigger is connected to ground, the power terminal of the 74HC123D monostable trigger is connected to a +5V voltage, the 74HC123D monostable trigger is connected to ground after being connected in parallel with a resistor and a capacitor, the output terminal of the 74HC123D monostable trigger is connected to the input terminal of the AD8307ANZ logarithmic amplifier, the output terminal of the AD8307ANZ logarithmic amplifier is connected to the dual-channel analysis module 15 as a differential output terminal, and the 16MHz crystal oscillator is connected to the clock input terminal of the 74HC123D monostable trigger.

[0031] The dual-channel analysis module 15 includes a first AD633 analog multiplier, a second AD633 analog multiplier, a third OPA2197ID operational amplifier, and an RMS converter AD736JRZ; the input end of the first AD633 analog multiplier is connected to the output end of the signal conditioning module 13, the output end of the first AD633 analog multiplier is connected to the input end of the third OPA2197ID operational amplifier, the input end of the second AD633 analog multiplier is connected to the output end of the time differential engine 14, the output end of the second AD633 analog multiplier is connected to the input end of the third OPA2197ID operational amplifier, the output end of the third OPA2197ID operational amplifier is connected to the input end of the RMS converter AD736JRZ, and the output end of the RMS converter AD736JRZ is connected to the input end of the dynamic compensation controller 16.

[0032] The dynamic compensation controller 16 includes an AD534 analog multiplier, an INA188 instrumentation amplifier, an ADS1248IPW analog-to-digital converter, a CD4053 multiplexer, a first OPA2197IDR operational amplifier, and an X9C103S digital potentiometer; the input end of the AD534 analog multiplier is connected to the output end of the dual-channel analysis module 15, the other input end of the AD534 analog multiplier is connected to the output end of the INA188 instrumentation amplifier, the output end of the AD534 analog multiplier is connected to the common end of the CD4053 multiplexer, the input end of the INA188 instrumentation amplifier is connected to the output end of the valve position sensor 20, the output end of the CD4053 multiplexer is connected to the input end of the OPA2197IDR operational amplifier, the output end of the OPA2197IDR operational amplifier is reversely connected to its input end, the output end of the OPA2197IDR operational amplifier is connected to the input end of the X9C103S digital potentiometer, and the compensation output end of the X9C103S digital potentiometer outputs a compensation signal.

[0033] The valve-controlled drive module 17 includes a second OPA2197IDR operational amplifier, a third OPA2197IDR operational amplifier, a BUF634U buffer, a MOS transistor, and an INA199A1 current detection amplifier. The input end of the second OPA2197IDR operational amplifier is connected to the output end of the dynamic compensation controller 16, the input end of the second OPA2197IDR operational amplifier is connected to the main controller 18, the output ends of the second OPA2197IDR operational amplifier and the third OPA2197IDR operational amplifier are connected to the input end of the BUF634U buffer, the output end of the BUF634U buffer is connected to the gate of the MOS switch, the source of the MOS transistor is connected to ground after a series resistor, the drain of the MOS transistor is connected to the main controller 18, the source of the MOS transistor is connected to the input end of the INA199A1 current detection amplifier, and the output end of the INA199A1 current detection amplifier is connected to the main controller 18 as a feedback output end.

[0034] When the electric, heat and gas coordinated control system is working, The signal conditioning module 13 pre-processes the pressure sensor signal and performs a first-order low-pass filter on the raw pressure sensor signal, where the current filtered value is equal to the filtered value at the previous moment multiplied by the attenuation coefficient, plus the current raw value multiplied by the complementary coefficient. It detects electric heating configuration change events and marks them as valid events when the load change exceeds the set threshold. It calculates the valve position change rate by taking the difference between the current valve position and the valve position in the previous period, dividing it by the time interval, and then multiplying it by an exponential attenuation coefficient based on the change. The time differential engine 14 detects the electric heating configuration change event, records the exact moment when the electric heating configuration changes, detects the exact moment when the subsequent pressure reaches a peak, and calculates the time difference between the above two moments; The dual-channel analysis module 15 performs pressure oscillation energy calculation and event time difference analysis. It calculates the pressure oscillation energy and determines the mismatch condition by averaging the square of the deviation between the pressure value and the average value within a set time window. When the load is within a preset range, the pressure oscillation energy exceeds the threshold, and the event time difference is greater than the set value, a response mismatch is confirmed. The dynamic compensation controller 16 generates an adaptive compensation signal, generates a feedforward compensation component, whose magnitude is proportional to the change in the electrothermal configuration and decays exponentially with time, and generates a feedback compensation component, which includes a proportional term proportional to the pressure deviation and an integral term of the integral of the pressure deviation. The integral gain is linearly adjusted according to the temperature change, and the integral gain increases by 1.5 thousandths for every degree increase in temperature. The valve control drive module 17 performs valve dynamic compensation and sends it to the main controller 18, performs dead zone compensation, increases the fixed offset when the total compensation signal is positive, and reduces the fixed offset when it is negative, implements rate limiting to ensure that the valve output change rate does not exceed 25% of the valve position change per second, outputs limiting processing, takes the upper limit when the compensation signal exceeds the upper limit, and takes the lower limit when it falls below the lower limit, and valve saturation detection, triggers the anti-saturation processing mechanism when the actual valve change rate is close to zero and the compensation signal exceeds the threshold; The control performance is quantified by counting the absolute value of the average pressure deviation within the set period. When the performance index exceeds the target value, the proportional gain is adjusted according to the change trend of the gain of the performance index. When the cumulative valve movement exceeds the threshold, the feedforward time constant is proportionally reduced. When the load is lower than 70%, proportional-integral control is adopted; when the load is between 70% and 80%, the adaptive compensation mode is adopted; when the load is higher than 80%, the feedforward dominant mode is adopted. A hybrid control strategy is adopted in the transition zone. The output value is the weighted sum of the outputs of the two modes, and the weight coefficient changes linearly with the load.

[0035] When the entire boiler is working, water is continuously added through the water supply valve interface 6. After the external water enters the water space 4, as the water volume increases, the water can spread upward through the inner circle water pipe 8 and the outer circle water pipe 9. During this process, when electric heating is required, the main controller 18 can control the flange electric heating tube 5 for electric heating, so that the water is converted into steam and enters the steam space 10. If it is necessary to convert it through the gas burner 3, the gas burner 3 works and burns to generate a large amount of heat into the combustion chamber 1, so that the water in the outer circle water pipe 8 and the outer circle water pipe 9 can be heat-exchanged to form steam and enter the steam space 10. After passing through the uniform air plate 11, the steam in the lower space of the steam space 10 can be uniformly entered into the upper space of the steam space 10, and finally leave through the steam valve interface 12. In this way, the entire boiler can realize the combination of combustion and electric heating, and in order to provide steam stably, it is coordinated through the electric heating and gas collaborative control system.

[0036] The electric, heat and gas coordinated control system realizes the identification and dynamic compensation of the mismatch between the electric and heat group start and stop and the gas valve adjustment response speed in the dual-source control of steam boilers.

[0037] After the electric, thermal and gas coordinated control system is started, the steam pressure signal collected in real time by the pressure sensor is input into the signal conditioning module 13, amplified by the INA128P instrument amplifier, and then subjected to noise filtering processing with a cutoff frequency of 0.2Hz by a first-order low-pass filter composed of the first OPA2197ID operational amplifier. Its algorithm follows the recursive relationship that the current filter value is equal to the filter value at the previous moment multiplied by the attenuation coefficient plus the current original value multiplied by the complementary coefficient, effectively suppressing high-frequency interference; at the same time, the electric heating configuration status signal is input into the time differential engine 14 through the HCPL2630 optocoupler isolator. The rising and falling edges of the configuration change are detected by the 74HC123D monostable trigger and the precise timestamp is recorded. The rate of change is then calculated by the AD8307ANZ logarithmic amplifier. When the load change is detected to exceed the 5% threshold, it is marked as a valid event.

[0038] The valve position feedback signal is differentially amplified by the INA188ID instrumentation amplifier and then input into the dynamic compensation controller 16.

[0039] The dual-channel analysis module 15 receives the pressure signal from the signal conditioning module 13 and the configuration change information from the time differential engine 14. It first calculates the pressure oscillation energy by quantifying the fluctuation intensity by averaging the square of the deviation between the pressure value and the average value within a 10-second time window. At the same time, it calculates the time difference between the configuration change moment and the subsequent pressure peak moment. When the system load is in the range of 68% to 82% and the pressure oscillation energy exceeds the threshold and the time difference is greater than 300ms, it is determined that a response mismatch has occurred.

[0040] The dynamic compensation controller 16 then starts the compensation mechanism. The feedforward compensation component generates an initial compensation amount of 30% of the change according to the exponential decay law based on the change in the electrothermal configuration and decays to zero within 400ms.

[0041] The feedback compensation component is generated based on the deviation between the set pressure and the actual pressure, and includes a proportional term and an integral term. The integral gain is automatically adjusted with temperature changes. The gain increases by 0.15% for every 1°C increase in temperature. The two components are superimposed and input into the valve control drive module 17. The module first performs dead zone compensation. When the total compensation signal is positive, a fixed offset of 1.5% is added. When it is negative, the offset is reduced by 1.5% to overcome the mechanical dead zone of the valve. The signal is then output to the main controller 18 through the BUF634U buffer and the MOS tube. The main controller controls the gas valve and strictly limits the valve opening change rate to no more than 25% of the valve position range per second to prevent overshoot of the actuator action, thereby achieving steam pressure control.

[0042] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A gas-fired cross-flow steam boiler with electric heating function, characterized in that: The invention comprises a water space (4) capable of inletting and outletting water, a combustion chamber (1) arranged above the water space (4), an insulating tube (2) arranged at the top of the combustion chamber (1) and connected thereto, a steam space (10) arranged at the top of the combustion chamber (1) and located at the outer ring of the insulating tube (2), and a plurality of inner ring water pipes (8) and outer ring water pipes (9) connecting the steam space (10) and the water space (4), wherein the outer ring of the water space (4) is provided with a flange-type electric heating pipe (5) extending therein, a gas burner (3) connected thereto is installed at the top of the insulating tube (2), a feed end of the gas fuel engine is connected to the gas through a gas valve, an air-distributing plate (11) is provided in the steam space (10) to separate it into an upper and a lower space, a steam valve interface (12) connected to the upper space is installed at the top of the steam space (10), and the gas burner (3) and the flange-type electric heating pipe (5) are coupled together with a main controller (18).

2. The gas-fired cross-flow steam boiler with electric heating function according to claim 1, characterized in that: The water space (4) is connected to a water supply valve interface (6) and a sewage valve interface (7).

3. The gas-fired cross-flow steam boiler with electric heating function according to claim 1, characterized in that: The main controller (18) is coupled to an electric, heat and gas coordinated control system. The electric, heat and gas coordinated control system monitors the electric and heat configuration changes and steam pressure fluctuations in real time and dynamically generates a feedforward-feedback composite compensation signal when detecting high-frequency small-amplitude pressure oscillations caused by the mismatch between the start and stop of the electric and heat groups and the response speed of the gas valve in the 70-80% load range. After dead zone compensation and rate limitation, the gas valve is driven to adjust, and steam pressure control is achieved by combining temperature adaptive adjustment and multi-mode smooth switching strategy.

4. The gas-fired cross-flow steam boiler with electric heating function according to claim 3, characterized in that: The electric, heat and gas coordinated control system includes a signal conditioning module (13), a time differential engine (14), a dual-channel analysis module (15), a dynamic compensation controller (16), and a valve control drive module (17); The signal output end of the signal conditioning module (13) is connected to the first input end of the dual-channel analysis module (15), the differential output end of the time differential engine (14) is connected to the second input end of the dual-channel analysis module (15), the RMS output end of the dual-channel analysis module (15) is connected to the signal input end of the dynamic compensation controller (16), the compensation output end of the dynamic compensation controller (16) is connected to the first input end of the valve control drive module (17), the valve position output end of the valve control drive module (17) is connected to the control input end of the gas valve, and the gas valve is provided with a valve position sensor (20) and a temperature sensor (19), the valve position sensor (20) is connected to the feedback input end of the dynamic compensation controller (16), and the output end of the temperature sensor (19) is connected to the temperature input end of the dynamic compensation controller (16). The main controller (18) is coupled to the valve control drive module (17), and the main controller (18) is connected to the configuration input end of the time differential engine (14) to transmit the electric heating configuration state signal.

5. The gas-fired cross-flow steam boiler with electric heating function according to claim 4, characterized in that: The signal conditioning module (13) includes a pressure sensor arranged on the steam space (10) and having a probe extending into the steam space (10), an INA128P instrumentation amplifier, a first OPA2197ID operational amplifier, a second OPA2197ID operational amplifier, and an LTC1064-1CSW programmable filter, wherein the positive and negative terminals of the pressure sensor are respectively connected to the in-phase and inverting input terminals of the INA128P instrumentation amplifier, the reference terminal of the INA128P instrumentation amplifier is grounded, the output terminal of the INA128P instrumentation amplifier is connected to the non-inverting input terminal of the first OPA2197ID operational amplifier, and the first The non-inverting input terminal of the OPA2197ID operational amplifier is connected to a capacitor and then grounded, the output terminal of the first OPA2197ID operational amplifier is connected to the input terminal of the LTC1064-1CSW programmable filter, the output terminal of the LTC1064-1CSW programmable filter is connected to the non-inverting input terminal of the second OPA2197ID operational amplifier, the output terminal of the second OPA2197ID operational amplifier is connected to a capacitor and then grounded, the output terminal of the second OPA2197ID operational amplifier is connected to its inverting input terminal, and the output terminal of the second OPA2197ID operational amplifier is connected to a dual-channel analysis module (15).

6. The gas-fired cross-flow steam boiler with electric heating function according to claim 4, characterized in that: The time differential engine (14) includes an HCPL2630 optocoupler isolator, a 74HC123D monostable trigger, an AD8307ANZ logarithmic amplifier, and a 16MHz crystal oscillator; The anode of the HCPL2630 optocoupler isolator is connected to the main controller (18) to receive the electrothermal configuration signal, the cathode of the HCPL2630 optocoupler isolator is grounded, the power terminal of the HCPL2630 optocoupler isolator is connected to a +5V voltage, the output terminal of the HCPL2630 optocoupler isolator is connected to the input terminal of the 74HC123D monostable trigger, the ground terminal of the 74HC123D monostable trigger is grounded, the power terminal of the 74HC123D monostable trigger is connected to a +5V voltage, the 74HC123D monostable trigger is connected to ground after being connected in parallel with a resistor and a capacitor, the output terminal of the 74HC123D monostable trigger is connected to the input terminal of the AD8307ANZ logarithmic amplifier, the output terminal of the AD8307ANZ logarithmic amplifier is connected to the dual-channel analysis module (15) as a differential output terminal, and the 16MHz crystal oscillator is connected to the clock input terminal of the 74HC123D monostable trigger.

7. The gas-fired cross-flow steam boiler with electric heating function according to claim 4, characterized in that: The dual-channel analysis module (15) includes a first AD633 analog multiplier, a second AD633 analog multiplier, a third OPA2197ID operational amplifier, and an RMS converter AD736JRZ; The input end of the first AD633 analog multiplier is connected to the output end of the signal conditioning module (13), the output end of the first AD633 analog multiplier is connected to the input end of the third OPA2197ID operational amplifier, the input end of the second AD633 analog multiplier is connected to the output end of the time differential engine (14), the output end of the second AD633 analog multiplier is connected to the input end of the third OPA2197ID operational amplifier, the output end of the third OPA2197ID operational amplifier is connected to the input end of the RMS converter AD736JRZ, and the output end of the RMS converter AD736JRZ is connected to the input end of the dynamic compensation controller (16).

8. The gas-fired cross-flow steam boiler with electric heating function according to claim 4, characterized in that: The dynamic compensation controller (16) includes an AD534 analog multiplier, an INA188 instrumentation amplifier, an ADS1248IPW analog-to-digital converter, a CD4053 multiplexer, a first OPA2197IDR operational amplifier, and an X9C103S digital potentiometer; The input end of the AD534 analog multiplier is connected to the output end of the dual-channel analysis module (15), the other input end of the AD534 analog multiplier is connected to the output end of the INA188 instrumentation amplifier, the output end of the AD534 analog multiplier is connected to the common end of the CD4053 multiplexer, the input end of the INA188 instrumentation amplifier is connected to the output end of the valve position sensor (20), the output end of the CD4053 multiplexer is connected to the input end of the OPA2197IDR operational amplifier, the output end of the OPA2197IDR operational amplifier is reversely connected to its input end, the output end of the OPA2197IDR operational amplifier is connected to the input end of the X9C103S digital potentiometer, and the compensation output end of the X9C103S digital potentiometer outputs a compensation signal.

9. The gas-fired cross-flow steam boiler with electric heating function according to claim 4, characterized in that: The valve-controlled drive module (17) includes a second OPA2197IDR operational amplifier, a third OPA2197IDR operational amplifier, a BUF634U buffer, a MOS tube, and an INA199A1 current detection amplifier; The input end of the second OPA2197IDR operational amplifier is connected to the output end of the dynamic compensation controller (16), the input end of the second OPA2197IDR operational amplifier is connected to the main controller (18), the output ends of the second OPA2197IDR operational amplifier and the third OPA2197IDR operational amplifier are connected to the input end of the BUF634U buffer, the output end of the BUF634U buffer is connected to the gate of the MOS switch, the source of the MOS tube is connected to the ground after being connected in series with a resistor, the drain of the MOS tube is connected to the main controller (18), the source of the MOS tube is connected to the input end of the INA199A1 current detection amplifier, and the output end of the INA199A1 current detection amplifier is connected to the main controller (18) as a feedback output end.

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