Methanol and carbon dioxide generator with multi-section fire full premixed combustion

Abstract

The utility model relates to a multi-section fire full premixed combustion methanol carbon dioxide generator which comprises a methanol positive displacement pump, a servo fan, a methanol vaporizer, a mixer and a combustor, and a gas outlet of the servo fan is connected with a first gas inlet of the mixer; a liquid outlet of the methanol positive displacement pump is connected with a liquid inlet of the methanol vaporizer; a gas outlet of the methanol vaporizer is connected with a second gas inlet of the mixer; an outlet of the mixer is connected with the combustor; and the controller is used for controlling the rotating speed of the servo fan and the flow of the methanol displacement pump. According to the utility model, the pulse generator is controlled by the controller, and the pulse generator outputs two paths of pulse signals to respectively control the pulse number of the servo motor of the servo fan and the pulse number of the motor of the methanol displacement pump, so that the rotating speed of the servo fan and the flow of the methanol displacement pump are controlled; and the flow of the air and the methanol steam entering the mixer at the same time is controlled, so that the mixed gas entering the combustor can be completely combusted.

Description

Technical Field

[0001] This utility model belongs to the technical field of carbon dioxide generators, and specifically relates to a methanol carbon dioxide generator with multi-stage premixed combustion. Background Technology

[0002] Organic matter combustion to produce carbon dioxide is a method of carbon dioxide generation used in greenhouse agriculture abroad. It involves burning organic matter to produce carbon dioxide, which is then applied to the greenhouse to adjust the carbon dioxide concentration and meet the plant's carbon dioxide requirements, thereby increasing yield. Therefore, the carbon dioxide gas applied in the greenhouse is also called gaseous fertilizer, or simply gas fertilizer.

[0003] Methanol combustion generates carbon dioxide to supply the photosynthetic needs of greenhouse crops. In practice, the combustion power needs to be adjusted to meet different combustion intensities and achieve varying supply rates of carbon dioxide per unit time. Since carbon dioxide production via combustion requires complete combustion, otherwise large amounts of harmful gases, such as combustion byproducts, will be generated, posing a threat to both crops and operators.

[0004] Currently, the combustion of gaseous fuels can be achieved by automatically controlling the air ratio to achieve different fuel flow rates through air-fuel ratio valves, making it very convenient to adjust the combustion intensity. However, in methanol gasification combustion, the gas temperature after methanol gasification is high, far exceeding the allowable operating temperature of the air-fuel ratio valve. Furthermore, methanol corrodes and swells the rubber diaphragm of the air-fuel ratio valve that automatically adjusts the air-fuel ratio. Therefore, the technical solution of using an air-fuel ratio valve is not suitable for adjusting the air-fuel ratio in methanol gasification combustion.

[0005] Current liquid fuel combustion systems typically employ multi-stage combustion to adjust combustion power, which involves installing nozzles with varying flow rates on the burner. Figure 1 As shown, different flow rate nozzles are combined to adjust the fuel injection quantity, achieving different thermal power outputs. For complete combustion, the damper size needs to be adjusted according to the fuel injection quantity to ensure adequate combustion air supply. Furthermore, the air-fuel ratio is adjusted based on the gas composition measured by a flue gas analyzer to achieve complete combustion. For small burners, space constraints prevent the arrangement of multiple nozzles, making power adjustment difficult. Therefore, they typically operate with single-stage ignition output, meaning the power is fixed and not adjustable.

[0006] The inventor previously disclosed a carbon dioxide fertilizer generator, Chinese patent CN215774425U, which consists of a frame, a combustion-supporting blower, a forced-air fully premixed burner, a combustion chamber, a flue gas mixer, a flue gas fan, a methanol electric vaporizer, and a fuel pump. However, this design is a single-stage combustion system with only one type of combustion power output. Utility Model Content

[0007] The purpose of this invention is to provide a methanol-carbon dioxide generator with multi-stage premixed combustion, which can adjust different combustion power to achieve different supply rates of carbon dioxide gas per unit time.

[0008] To achieve the above objectives, the present invention employs a multi-stage, fully premixed combustion methanol-carbon dioxide generator, comprising a methanol volumetric pump, a servo fan, a methanol vaporizer, a mixer, and a burner. The outlet of the servo fan is connected to the first inlet of the mixer via a flange; the outlet of the methanol volumetric pump is connected to the inlet of the methanol vaporizer; the outlet of the methanol vaporizer is connected to the second inlet of the mixer; and the outlet of the mixer is connected to the burner.

[0009] It also includes a controller for controlling the rotational speed of the servo fan and the flow rate of the methanol volumetric pump.

[0010] Preferably, the controller is connected to two pulse generators via communication or electrical connection; the two pulse generators are electrically connected to the servo motor of the servo fan and the servo motor of the methanol volumetric pump, respectively; the two pulse generators output two pulse signals, corresponding to the servo motor of the servo fan and the servo motor of the methanol volumetric pump, respectively.

[0011] Preferably, the controller stores n combinations of two-channel pulse counts, which can adjust different combustion power of the burner.

[0012] This invention discloses a multi-stage premixed combustion methanol-carbon dioxide generator, which has the following advantages compared with the prior art: A controller controls a pulse generator, which outputs two pulse signals to control the pulse count of the servo motor of the servo fan and the pulse count of the methanol volumetric pump motor, thereby controlling the speed of the servo fan and the flow rate of the methanol volumetric pump. This, in turn, controls the flow rates of air and methanol vapor entering the mixer simultaneously, ensuring complete combustion of the mixture entering the burner and preventing carbon monoxide production. When the combustion intensity needs to be changed, the controller calls the data of each combustion stage stored internally, and controls the speed of the servo fan and the flow rate of the methanol volumetric pump through the pulse generator, changing the methanol flow rate and air volume in the burner, thus changing the combustion intensity. Complete combustion is achieved in each combustion stage, producing pure carbon dioxide gas. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a multi-stage methanol burner in the prior art;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of a methanol-carbon dioxide generator.

[0016] Figure 4 This is a schematic diagram of the mixer and burner structure. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] like Figures 2-4 As shown, a multi-stage, fully premixed combustion methanol-carbon dioxide generator includes a methanol volumetric pump 1, a servo fan 2, a methanol vaporizer 3, a mixer 4, a burner 5, and a controller.

[0019] The outlet of the servo fan 2 is connected to the first inlet of the mixer 4 via a flange, allowing air to be introduced into the mixer 4. The outlet of the methanol volumetric pump 1 is connected to the inlet of the methanol vaporizer 3 via a pipeline. The inlet of the methanol volumetric pump 1 is connected to the fuel tank, drawing methanol from the fuel tank and pumping it into the methanol vaporizer 3, where the methanol vaporizer 3 vaporizes the liquid methanol. The methanol volumetric pump 1 is a pulse-type volumetric pump, such as a stepper motor-driven volumetric pump. The outlet of the methanol vaporizer 3 is connected to the second inlet of the mixer 4 via a pipeline. The mixer 4 has a venturi structure, mixing air and methanol vapor. The outlet of the mixer 4 is connected to the burner 5, which can be a surface burner. The uniformly mixed combustible gas is ejected from the densely distributed injection holes on the surface of the burner 5, ignited by an ignition device, forming a flame around the burner 5, and producing carbon dioxide after combustion.

[0020] The controller is used to control the rotational speed of the servo fan 2 and the flow rate of the methanol volumetric pump 1. The controller is connected to two pulse generators via communication or electrical connection. The two pulse generators are electrically connected to the servo motors of the servo fan 2 and the methanol volumetric pump 1, respectively. The two pulse generators output two pulse signals, which correspond to the servo motors of the servo fan 2 and the methanol volumetric pump 1, respectively. The controller controls the two pulse generators, and the two pulse generators output two pulse signals. The pulse frequency of the two pulse signals can be adjusted by the two pulse generators. The two pulse signals control the number of pulses of the servo motor of the servo fan 2 and the number of pulses of the motor of the methanol volumetric pump 1, thereby controlling the rotational speed of the servo fan 2 and the flow rate of the methanol volumetric pump 1, and thus controlling the flow rate of air and methanol vapor entering the mixer 4 at the same time, so that the mixture entering the burner 5 can be completely burned and carbon monoxide is avoided.

[0021] The controller's storage module stores n combinations of two-way pulse counts. Specifically, it stores the pulse counts of multiple servo motors of the servo blower 2 and the pulse counts of the methanol volumetric pump 1 motor at various combustion power levels. These combinations correspond to different air-fuel ratios for different combustion intensities. The methanol vapor flow rate is divided into multiple segments, and the air volume corresponds to the equivalence ratio of complete fuel combustion with the methanol vapor flow rate of each segment. By storing multiple pairs of methanol vapor flow rate and air volume ratios in the controller, different combustion power can be adjusted, and complete combustion can also be achieved. For example, using a 4-stage combustion mode, the minimum flow rate is 1 kg / h of methanol, with incremental combustion in 0.5 kg increments. The four segments are 1, 1.5, 2, 2.5, and 3 kg. The pulse counts of the methanol volumetric pump 1 motor corresponding to the four methanol vapor flow rates and the pulse counts of the servo motors of the servo blower 2 corresponding to the complete combustion air volume are input into the storage module for use when adjusting the combustion intensity.

[0022] The method of using this utility model is as follows: First, start the methanol vaporizer 3. When the temperature of the methanol vaporizer 3 reaches the set temperature, the methanol volumetric pump 1 starts to continuously inject liquid methanol into the methanol vaporizer 3. The methanol liquid begins to vaporize. The methanol liquid passes through the methanol vaporizer 3 and reaches the outlet of the methanol vaporizer 3 completely vaporized. At this time, the vaporized methanol gas enters the mixer 4 and is premixed with the equivalent air supplied by the servo blower 2 in the mixer 4. The fuel supply of the methanol volumetric pump 1 delivers fuel to the vaporizer for vaporization at a given flow rate. At the same time as the methanol gas enters the mixer 4, the servo blower 2 also supplies the equivalent air to the mixer 4 for premixing. When the mixed gas reaches the burner 5, it is ignited by the ignition device. The flame detection device detects the flame, indicating that the ignition is successful. The methanol and air then burn at the set combustion intensity. When it is necessary to change the combustion intensity, the controller issues a command or receives a remote control command, calls the data of each combustion stage stored in the controller, controls the speed of the servo fan 2 and the flow rate of the methanol volumetric pump 1 through the pulse generator, changes the methanol flow rate and air volume in the burner 5, changes the combustion intensity, achieves complete combustion in each combustion stage, and produces pure carbon dioxide gas.

Claims

1. A multi-stage premixed combustion methanol-carbon dioxide generator, comprising a methanol volumetric pump (1), a servo fan (2), a methanol vaporizer (3), a mixer (4), and a burner (5), wherein the outlet of the servo fan (2) is connected to the first inlet of the mixer (4); the outlet of the methanol volumetric pump (1) is connected to the inlet of the methanol vaporizer (3); the outlet of the methanol vaporizer (3) is connected to the second inlet of the mixer (4); and the outlet of the mixer (4) is connected to the burner (5). Its features are, It also includes a controller for controlling the rotational speed of the servo fan (2) and the flow rate of the methanol volumetric pump (1).

2. The methanol-carbon dioxide generator with multi-stage premixed combustion according to claim 1, characterized in that, The controller is connected to two pulse generators via communication or electrical connection; the two pulse generators are electrically connected to the servo motor of the servo fan (2) and the servo motor of the methanol volumetric pump (1), respectively; the two pulse generators output two pulse signals, which correspond to the servo motor of the servo fan (2) and the servo motor of the methanol volumetric pump (1), respectively.

3. The methanol-carbon dioxide generator with multi-stage premixed combustion according to claim 2, characterized in that, The controller stores n combinations of two-path pulse counts, which can adjust the different combustion power of the burner (5).

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