Full-flow flue gas corrosion detection, prevention and control system for gas-fired boiler

Abstract

The utility model relates to the field of flue gas corrosion of gas-fired boilers, and provides a full-flow flue gas corrosion detection, prevention and control system for a gas-fired boiler. Comprising a gas-fired boiler detection module, an energy saver detection module, a chimney detection module, a flue gas corrosion control module and a flue. Different corrosion sensors are arranged on all the modules, so that the smoke corrosion state of all key parts of the gas boiler can be obtained in real time. According to different corrosion parameters, the control system can automatically adjust the operation parameters of the gas-fired boiler, the remote driving system adjusts the addition amount of alkali liquor, early warning information is sent out in time, and the corrosion risk is reduced. According to the system, by optimizing boiler operation parameters and anti-corrosion measures, fuel consumption is reduced, pollutant emission is reduced, and the system has good environment-friendly and energy-saving performance and economical efficiency.

Description

Technical Field

[0001] This invention relates to the detection and control of flue gas corrosion in gas-fired boilers, specifically to a full-process flue gas corrosion detection and control system for gas-fired boilers. Background Technology

[0002] Gas-fired boilers are widely used as important equipment for industrial and residential heating due to their advantages such as high efficiency, energy saving, and clean environmental protection. However, during the combustion process, elements such as sulfur and nitrogen in the fuel can generate SO2 and NO. x Flue gas contains acidic gases such as CO2. When these gases combine with water vapor in the flue gas, they form highly corrosive acidic solutions (such as sulfuric acid, nitric acid, and carbonic acid), causing severe corrosion to boiler heating surfaces, economizers, chimneys, and other equipment. Therefore, effectively detecting and controlling flue gas corrosion in gas-fired boilers is crucial for ensuring their safe and stable operation. Currently, corrosion prevention in gas-fired boilers mainly employs techniques such as spraying anti-corrosion coatings, flue gas condensation recovery, and fuel desulfurization and denitrification. However, these methods are inefficient, have high operating costs, and easily cause secondary pollution such as waste residue and wastewater.

[0003] CN106442299 B discloses a "low-temperature flue gas corrosion detection system," which controls the temperature of corrosion samples by controlling the water temperature in the boiler return water pipe to predict low-temperature flue gas acid corrosion at the tail end of a coal-fired power plant boiler. CN112763399 B discloses a "detection method for flue gas corrosion risk areas on low-temperature heating surfaces of boilers," which obtains the boundary conditions of the low-temperature heating surface and flue gas heat transfer area at the boiler tail end through detection, and uses fluid dynamics calculations to obtain the pressure distribution and temperature field of the flue gas on the boiler heating surface to determine the corrosion probability. However, detection systems for flue gas corrosion in gas-fired boilers suffer from problems such as limited detection locations. Optimizing the flue gas corrosion system by setting detection points at different locations within the gas-fired boiler system to achieve full-process flue gas corrosion detection and control is crucial. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a full-process flue gas corrosion detection and control system for gas-fired boilers. This system can insert corrosion sensors at different locations where corrosion occurs and remotely drive the system to inject alkaline solution based on feedback signals for appropriate corrosion control. It solves the key technical problems of high operating costs and the damage to internal boiler components such as flues, economizers, and chimneys caused by complex detection device installation.

[0005] The specific technical solution of the present invention is to provide a whole-process flue gas corrosion detection and control system for gas-fired boilers, characterized in that it includes: a gas-fired boiler detection module (111), an energy-saving device detection module (222), a chimney detection module (333), a flue gas corrosion control module (444), flue I (4) and flue II (5);

[0006] The gas boiler detection module (111) includes a gas boiler (1), an insulation circuit (6), a corrosion detector I (71), a corrosion detector II (72), a corrosion plate I (81), a corrosion plate II (82), a flue gas recirculation pipe (18), a heating network return water pipe I (19), a heating network return water pipe II (20), a heating network supply water pipe I (21), and a heating network supply water pipe II (22). The heating network return water pipe I (19) is connected to the corrosion detector I (71) and the corrosion detector II (72) respectively. The corrosion detector I (71) and the corrosion detector II (72) are both connected to the heating network supply water pipe I (21). The heating network supply water pipe I (21) is connected to the heating network supply water pipe II (22). The heating network return water pipe II (20), the gas boiler (1), and the heating network supply water pipe II (22) are connected in sequence.

[0007] The energy-saving device detection module (222) includes an energy-saving device (2), a corrosion detector III (73), a corrosion plate III (83), an alkali tank (11), an alkali control valve (12), a pH sensor (17), and a drainage pipe (23); the alkali tank (11), the alkali control valve (12), and the energy-saving device (2) are connected in sequence, and the pH sensor (17) is connected to the drainage pipe (23) at the lower end of the energy-saving device (2);

[0008] The chimney detection module (333) includes a chimney (3), a corrosion detector IV (74), a corrosion plate IV (84), a cathodic protection device (13), and an anode sacrificial material (14). The cathodic protection device (13) and the chimney (3) form a closed loop. The flue gas sensor I (101) is installed on the flue I (4), and the flue gas sensor II (102) is installed on the flue II (5).

[0009] The flue gas corrosion control module (444) includes a signal acquisition controller (15), a computer (16), the insulating circuit (6), the corrosion detector I (71), the corrosion detector II (72), the flue gas sensor I (101), the flue gas sensor II (102), the alkali control valve (12), the corrosion detector III (73), the corrosion detector IV (74), the cathodic protection device (13), and the pH sensor (17). The insulating circuit (6), the corrosion detector I (71), the corrosion detector II (72), the flue gas sensor I (101), the flue gas sensor II (102), the corrosion detector III (73), the corrosion detector IV (74), the cathodic protection device (13), and the pH sensor (17) are all connected to the signal acquisition controller (15) as signal input terminals. The signal acquisition controller (15) outputs a signal to the alkali control valve (12). The signal acquisition controller (15) is connected to the computer (16).

[0010] As a further embodiment of the present invention, the corrosion detector I (71), corrosion plate I (81) and insulating circuit (6) are installed in the flue gas chamber at the front end of the gas boiler (1), the corrosion detector II (72) and the corrosion plate II (82) are installed in the flue gas chamber at the rear end of the gas boiler (1), and the corrosion detector III (73) and the corrosion plate III (83) are installed in the flue gas duct at the rear end of the energy saver (2).

[0011] The working principle of this invention is as follows: Corrosion detector I, corrosion detector II, corrosion plate I, and corrosion plate II detect the corrosion situation inside the gas-fired boiler and transmit the signal to the signal acquisition controller. When condensate appears in the flue gas chamber of the gas-fired boiler, the insulating circuit becomes conductive due to connection and transmits the signal to the signal acquisition controller. Flue gas sensor I detects the composition of flue gas in the chimney and transmits the signal to the signal acquisition controller. The signal acquisition controller transmits the signal to the computer and calculates the optimal operating parameters. The operator adjusts the air-fuel ratio and the amount of flue gas recirculation according to the operating parameters to avoid corrosion inside the boiler. A portion of the return water from the heating network is used to cool corrosion detector I and corrosion detector II. A pH detector... The pH value of the condensate in Eco-converter II is detected. Corrosion detector III and corrosion plate III detect the corrosion rate in the flue gas condensation zone of Eco-converter and transmit the signal to the signal acquisition controller. The signal acquisition controller controls the opening of the alkali control valve to adjust the amount of alkali sprayed from the alkali tank to Eco-converter, so that the condensate in Eco-converter is neutral. Corrosion detector IV and corrosion plate IV detect the flue gas corrosion in the chimney and transmit the signal to the signal acquisition controller. The corrosion prevention measure in the chimney is the cathodic protection method of sacrificial anode. When the anode sacrificial material is exhausted, the cathodic protection device transmits the signal to the signal acquisition controller. The signal acquisition controller outputs the signal to the computer, and the computer issues an alarm to replace the anode sacrificial material.

[0012] The effective benefits of this invention are as follows: By establishing a full-process corrosion detection module, each detection module detects the corrosion rate and outputs signals to a signal acquisition controller, which then transmits the signals to a computer. This enables accurate assessment and calculation of optimal operating conditions for guidance. When the corrosion rate in a certain area is too fast, the computer can issue an alarm in a timely manner to prompt staff to make timely adjustments. Furthermore, different anti-corrosion countermeasures are proposed for different areas, which can greatly reduce the occurrence of corrosion. By optimizing boiler operating parameters and anti-corrosion measures, fuel consumption and pollutant emissions are reduced, resulting in good environmental protection, energy saving, and economic benefits. Attached Figure Description

[0013] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0014] Figure 1 This is a schematic diagram of the system flow of the present invention.

[0015] In the diagram: Gas boiler detection module (111); Energy saver detection module (222); Chimney detection module (333); Flue gas corrosion control module (444); Gas boiler (1); Energy saver (2); Chimney (3); Flue I (4); Flue II (5); Insulation circuit (6); Corrosion detector I (71), Corrosion detector II (72); Corrosion detector III (73); Corrosion detector IV (74); Corrosion plate I (81); Corrosion plate II (82); Corrosion plate III (83); Corrosion Plate IV (84); Water cooler (9); Flue gas sensor I (101); Flue gas sensor II (102); Alkali tank (11); Alkali control valve (12); Cathodic protection device (13); Anode sacrificial material (14); Signal acquisition controller (15); Computer (16); pH sensor (17); Flue gas recirculation pipeline (18); Heating network return water pipe I (19); Heating network return water pipe II (20); Heating network supply water pipe I (21); Heating network supply water pipe II (22); Drainage pipeline (23). Detailed Implementation

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0017] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0018] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1:

[0019] A comprehensive flue gas corrosion detection and control system for gas-fired boilers. This system can insert corrosion sensors at different locations where corrosion occurs and remotely drive the system to inject alkaline solution based on feedback signals for appropriate corrosion control. It solves key technical problems such as high operating costs and the damage to internal boiler components like flues, economizers, and chimneys caused by complex detection device installation.

[0020] The specific technical solution of the present invention is to provide a whole-process flue gas corrosion detection and control system for gas-fired boilers, characterized in that it includes: a gas-fired boiler detection module (111), an energy-saving device detection module (222), a chimney detection module (333), a flue gas corrosion control module (444), flue I (4) and flue II (5);

[0021] The gas boiler detection module (111) includes a gas boiler (1), an insulation circuit (6), a corrosion detector I (71), a corrosion detector II (72), a corrosion plate I (81), a corrosion plate II (82), a flue gas recirculation pipe (18), a heating network return water pipe I (19), a heating network return water pipe II (20), a heating network supply water pipe I (21), and a heating network supply water pipe II (22). The heating network return water pipe I (19) is connected to the corrosion detector I (71) and the corrosion detector II (72) respectively. The corrosion detector I (71) and the corrosion detector II (72) are both connected to the heating network supply water pipe I (21). The heating network supply water pipe I (21) is connected to the heating network supply water pipe II (22). The heating network return water pipe II (20), the gas boiler (1), and the heating network supply water pipe II (22) are connected in sequence.

[0022] The energy-saving device detection module (222) includes an energy-saving device (2), a corrosion detector III (73), a corrosion plate III (83), an alkali tank (11), an alkali control valve (12), a pH sensor (17), and a drainage pipe (23); the alkali tank (11), the alkali control valve (12), and the energy-saving device (2) are connected in sequence, and the pH sensor (17) is connected to the drainage pipe (23) at the lower end of the energy-saving device (2);

[0023] The chimney detection module (333) includes a chimney (3), a corrosion detector IV (74), a corrosion plate IV (84), a cathodic protection device (13), and an anode sacrificial material (14). The cathodic protection device (13) and the chimney (3) form a closed loop. The flue gas sensor I (101) is installed on the flue I (4), and the flue gas sensor II (102) is installed on the flue II (5).

[0024] The flue gas corrosion control module (444) includes a signal acquisition controller (15), a computer (16), the insulating circuit (6), the corrosion detector I (71), the corrosion detector II (72), the flue gas sensor I (101), the flue gas sensor II (102), the alkali control valve (12), the corrosion detector III (73), the corrosion detector IV (74), the cathodic protection device (13), and the pH sensor (17). The insulating circuit (6), the corrosion detector I (71), the corrosion detector II (72), the flue gas sensor I (101), the flue gas sensor II (102), the corrosion detector III (73), the corrosion detector IV (74), the cathodic protection device (13), and the pH sensor (17) are all connected to the signal acquisition controller (15) as signal input terminals. The signal acquisition controller (15) outputs a signal to the alkali control valve (12). The signal acquisition controller (15) is connected to the computer (16).

[0025] As a further embodiment of the present invention, the corrosion detector I (71), corrosion plate I (81) and insulating circuit (6) are installed in the flue gas chamber at the front end of the gas boiler (1), the corrosion detector II (72) and the corrosion plate II (82) are installed in the flue gas chamber at the rear end of the gas boiler (1), and the corrosion detector III (73) and the corrosion plate III (83) are installed in the flue gas duct at the rear end of the energy saver (2).

[0026] The specific implementation process of the present invention is as follows: In the flue gas transfer chamber at the front end of the gas boiler (1), flue gas condensation is likely to occur. The corrosion plate I (81) in the flue gas transfer chamber at the front end forms a closed loop with the corrosion detector I (71). The corrosion plate I (81) is reduced in volume due to corrosion, which increases the resistance and transmits the signal to the corrosion detector I (71). The corrosion detector I (71) transmits the identified signal to the signal acquisition controller (15). When condensate is generated in the flue gas transfer chamber at the front end, the insulating circuit (6) becomes conductive. The insulating circuit (6) transmits the flue gas condensation information to the signal acquisition controller (15). The corrosion plate II (82) in the flue gas transfer chamber at the rear end of the boiler and the corrosion detector II ( 72) The corrosion of the high-temperature zone of the gas boiler (1) is detected. The corrosion detector II (72) transmits the signal to the signal acquisition controller (15). Since the flue gas temperature in the gas boiler (1) is high, the corrosion detector I (71) and corrosion detector II (72) are easily damaged. Therefore, the heat network return water is used to cool them down. The flue gas sensor I (101) detects the flue gas composition in the flue I (4) and transmits the signal to the signal acquisition controller (15). The signal acquisition controller (15) outputs to the computer (16) and calculates the appropriate air-fuel ratio parameters and flue gas recirculation parameters to provide the operator with operation guidance for the gas boiler (1) and avoid corrosion in the gas boiler (1).

[0027] The corrosion detector III (73) and corrosion plate III (83) detect the corrosion at the rear end of the energy saver (2) and transmit the signal to the signal acquisition controller (15). The pH sensor (17) detects the pH value of the condensate in the energy saver (2) and transmits the signal to the signal acquisition controller (15). The flue gas sensor II (102) detects the composition of the flue gas in the flue II (5) and transmits the signal to the signal acquisition controller (15). The signal acquisition controller (15) outputs a signal to the alkali control valve (12) to adjust the opening of the alkali control valve (12) and control the amount of alkali delivered from the alkali tank (15) to the energy saver (2) to ensure that the condensate in the energy saver (2) is neutral.

[0028] The corrosion detector IV (74) and corrosion plate IV (84) detect the corrosion of flue gas inside the chimney (3) and transmit the signal to the signal acquisition controller (15). The corrosion prevention measure inside the chimney (3) is the cathodic protection method of sacrificial anode. When the anode sacrificial material (14) is exhausted, the cathodic protection device (13) transmits the signal to the signal acquisition controller (15). The signal acquisition controller (15) outputs the signal to the computer (16), and the computer (16) issues an alarm to replace the anode sacrificial material (14).

[0029] It should be noted that when the signal acquisition controller (15) detects that the corrosion rate of any area detected by corrosion detector I (71), corrosion detector II (72), corrosion detector III (73) and corrosion detector IV (74) is too fast, the computer (16) will issue an alarm signal to prompt the staff to make timely adjustments.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A full-process flue gas corrosion detection and control system for gas-fired boilers, characterized in that, include: Gas boiler testing module (111), energy saver testing module (222), chimney testing module (333), flue gas corrosion control module (444), flue I (4) and flue II (5); The gas boiler detection module (111) includes a gas boiler (1), an insulation circuit (6), a corrosion detector I (71), a corrosion detector II (72), a corrosion plate I (81), a corrosion plate II (82), a flue gas recirculation pipe (18), a heating network return water pipe I (19), a heating network return water pipe II (20), a heating network supply water pipe I (21), and a heating network supply water pipe II (22). The heating network return water pipe I (19) is connected to the corrosion detector I (71) and the corrosion detector II (72) respectively. The corrosion detector I (71) and the corrosion detector II (72) are both connected to the heating network supply water pipe I (21). The heating network supply water pipe I (21) is connected to the heating network supply water pipe II (22). The heating network return water pipe II (20), the gas boiler (1), and the heating network supply water pipe II (22) are connected in sequence. The energy-saving device detection module (222) includes an energy-saving device (2), a corrosion detector III (73), a corrosion plate III (83), an alkali tank (11), an alkali control valve (12), a pH sensor (17), and a drainage pipe (23); the alkali tank (11), the alkali control valve (12), and the energy-saving device (2) are connected in sequence, and the pH sensor (17) is connected to the drainage pipe (23) at the lower end of the energy-saving device (2); The chimney detection module (333) includes a chimney (3), a corrosion detector IV (74), a corrosion plate IV (84), a cathodic protection device (13), and an anode sacrificial material (14). The cathodic protection device (13) and the chimney (3) form a closed loop. The flue gas sensor I (101) is installed on the flue I (4), and the flue gas sensor II (102) is installed on the flue II (5). The flue gas corrosion control module (444) includes a signal acquisition controller (15), a computer (16), the insulating circuit (6), the corrosion detector I (71), the corrosion detector II (72), the flue gas sensor I (101), the flue gas sensor II (102), the alkali control valve (12), the corrosion detector III (73), the corrosion detector IV (74), the cathodic protection device (13), and the pH sensor (17). The insulating circuit (6), the corrosion detector I (71), the corrosion detector II (72), the flue gas sensor I (101), the flue gas sensor II (102), the corrosion detector III (73), the corrosion detector IV (74), the cathodic protection device (13), and the pH sensor (17) are all connected to the signal acquisition controller (15) as signal input terminals. The signal acquisition controller (15) outputs a signal to the alkali control valve (12). The signal acquisition controller (15) is connected to the computer (16).

2. The whole-process flue gas corrosion detection and control system for gas-fired boilers according to claim 1, characterized in that, The corrosion detector I (71), corrosion plate I (81) and insulating circuit (6) are installed in the flue gas chamber at the front end of the gas boiler (1), the corrosion detector II (72) and corrosion plate II (82) are installed in the flue gas chamber at the rear end of the gas boiler (1), and the corrosion detector III (73) and corrosion plate III (83) are installed in the flue gas duct at the rear end of the energy saver (2).

Images