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

Abstract

The invention 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] The present invention relates to the detection and prevention of flue gas corrosion in gas boilers, and in particular to a full-process flue gas corrosion detection and prevention system for gas boilers. Background Art

[0002] Gas boilers are important equipment for industrial and civil heating, and are widely used due to their high efficiency, energy saving, cleanliness and environmental protection. However, during the combustion process of gas boilers, sulfur, nitrogen and other elements in the fuel can generate SO2, NO x , CO2 and other acidic gases. When these gases combine with water vapor in the flue gas, they will form highly corrosive acidic solutions (such as sulfuric acid, nitric acid, carbonic acid, etc.), which will cause serious corrosion to the heating surface at the rear of the boiler, economizers, chimneys and other equipment. Therefore, how to effectively detect and prevent the corrosion of gas boiler flue gas is a key issue to ensure the safe and stable operation of the boiler. At present, the anti-corrosion of gas boilers mainly adopts technical means such as spraying anti-corrosion coatings, flue gas condensation recovery, and fuel desulfurization and denitrification. However, these anti-corrosion efficiency is low, the technical operation cost is high, and it is easy to cause secondary pollution such as waste slag and wastewater.

[0003] CN106442299 B discloses "a flue gas low-temperature corrosion detection system", which controls the temperature of the corrosion sample by controlling the water temperature in the boiler return water pipe to predict the low-temperature flue gas acid corrosion at the tail of the coal-fired power station boiler. CN112763399 B discloses "a method for detecting the risk area of ​​flue gas corrosion on the low-temperature heating surface of the boiler", which obtains the boundary conditions of the low-temperature heating surface at the tail of the boiler and the flue gas heat transfer area by detection, and uses fluid mechanics to calculate the pressure distribution and temperature field of the flue gas on the boiler heating surface to determine the corrosion probability. However, the detection system for flue gas corrosion of gas boilers has problems such as a single detection position. If the flue gas corrosion system is optimized, detection points are set at different positions of the gas boiler system, and it is crucial to realize the detection and prevention of flue gas corrosion in the entire process of the gas boiler. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a gas boiler full-process flue gas corrosion detection and prevention system. The system can insert corrosion sensors for detection at different locations where corrosion occurs, and remotely drive the system to inject alkali solution according to the feedback signal to perform reasonable corrosion prevention and control. The key technical problems of high operating costs and the installation of complex detection devices that damage the internal flue, economizer, chimney and other parts of the boiler are solved.

[0005] The specific technical solution of the present invention is to provide a gas boiler full-process flue gas corrosion detection and prevention system, characterized in that it includes: a gas boiler detection module (111), an economizer detection module (222), a chimney detection module (333), a flue gas corrosion control module (444), a flue Ⅰ (4) and a flue Ⅱ (5); The gas boiler detection module (111) comprises a gas boiler (1), an insulating circuit (6), a corrosion detector I (71), a corrosion detector II (72), a corrosion sheet I (81), a corrosion sheet II (82), a flue gas recirculation pipeline (18), a heat network return pipe I (19), a heat network return pipe II (20), a heat network water supply pipe I (21) and a heat network water supply pipe II (22); the heat network return 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 heat network water supply pipe I (21), the heat network water supply pipe I (21) is connected to the heat network water supply pipe II (22), the heat network return pipe II (20), the gas boiler (1), and the heat network water supply pipe II (22) are connected in sequence; The energy saver detection module (222) comprises an energy saver (2), a corrosion detector III (73), a corrosion sheet III (83), an alkali liquid tank (11), an alkali liquid control valve (12), a pH value sensor (17) and a drainage pipe (23); the alkali liquid tank (11), the alkali liquid control valve (12) and the energy saver (2) are connected in sequence, and the pH value sensor (17) is connected to the drainage pipe (23) at the lower end of the energy saver (2); The chimney detection module (333) comprises a chimney (3), a corrosion detector IV (74), a corrosion sheet IV (84), a cathode protection device (13) and an anode sacrificial material (14), wherein the cathode 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) comprises a signal acquisition controller (15), a computer (16), the insulation 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 solution control valve (12), the corrosion detector III (73), the corrosion detector IV (74), the cathode protection device (13) and the pH sensor (17); the insulation 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 cathode protection device (13) and the pH sensor (17) are connected to the signal acquisition controller (15) as signal input ends; the signal acquisition controller (15) outputs a signal to the alkali solution control valve (12); and the signal acquisition controller (15) is connected to the computer (16).

[0006] As a further embodiment of the present invention, the corrosion detector I (71), the corrosion sheet I (81) and the insulating circuit (6) are installed in the smoke transfer chamber at the front end inside the gas boiler (1), the corrosion detector II (72) and the corrosion sheet II (82) are installed in the smoke transfer chamber at the rear end inside the gas boiler (1), and the corrosion detector III (73) and the corrosion sheet III (83) are installed in the rear end flue inside the economizer (2).

[0007] The working principle of the present invention is as follows: corrosion detector I, corrosion detector II, corrosion sheet I, and corrosion sheet II detect the corrosion situation in the gas boiler and transmit the signal to the signal acquisition controller. When condensed water appears in the smoke chamber of the gas boiler, the insulating circuit is turned on and conducts electricity, and transmits the signal to the signal acquisition controller. The flue gas sensor I detects the flue gas composition 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 staff adjusts the air-fuel ratio and the amount of flue gas recirculation according to the operating parameters to avoid corrosion in the boiler. A part of the return water from the heat network is used to cool the corrosion detector I and the corrosion detector II. The pH detector The pH value of the condensed water in the economizer II is detected. The corrosion detector III and the corrosion sheet III detect the corrosion rate of the flue gas condensation area of ​​the economizer, and transmit the signal to the signal acquisition controller. The signal acquisition controller controls the opening of the alkali solution control valve to adjust the amount of alkali solution sprayed from the alkali solution tank to the economizer, so that the condensed water of the economizer is neutral. The corrosion detector IV and the corrosion sheet IV detect the flue gas corrosion in the chimney, and transmit the signal to the signal acquisition controller. The anti-corrosion measure in the chimney is the cathodic protection method of the 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.

[0008] The effective gains of the present invention are as follows: by establishing a full-process corrosion detection module, each detection module detects the corrosion rate, outputs a signal to a signal acquisition controller, and the signal acquisition controller transmits it to a computer, so as to achieve accurate evaluation and calculate the best operating conditions for guidance. When the corrosion rate in a certain area is too fast, the computer can promptly issue an alarm to prompt the staff to make timely adjustments; and 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 can be reduced, and pollutant emissions can be reduced, which has good environmental protection, energy saving and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0010] Figure 1 It is a schematic diagram of the system flow of the present invention.

[0011] In the figure: gas boiler detection module (111); economizer detection module (222); chimney detection module (333); flue gas corrosion control module (444); gas boiler (1); economizer (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 sheet Ⅰ (81); corrosion sheet Ⅱ (82); corrosion sheet Ⅲ (83); corrosion Piece IV (84); water cooler (9); flue gas sensor I (101); flue gas sensor II (102); alkali liquid tank (11); alkali liquid control valve (12); cathode protection device (13); anode sacrificial material (14); signal acquisition controller (15); computer (16); pH sensor (17); flue gas recirculation pipeline (18); heating network return pipe I (19); heating network return pipe II (20); heating network water supply pipe I (21); heating network water supply pipe II (22); drainage pipeline (23). DETAILED DESCRIPTION

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0013] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0014] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1:

[0015] A gas boiler full-process flue gas corrosion detection and prevention system. The system can insert corrosion sensors for detection at different locations where corrosion occurs, and remotely drive the system to inject alkali solution according to the feedback signal to carry out reasonable corrosion prevention and control. It solves the key technical problems of high operating costs and the installation of complex detection devices that damage the internal flue, economizer, chimney and other parts of the boiler.

[0016] The specific technical solution of the present invention is to provide a gas boiler full-process flue gas corrosion detection and prevention system, characterized in that it includes: a gas boiler detection module (111), an economizer detection module (222), a chimney detection module (333), a flue gas corrosion control module (444), a flue Ⅰ (4) and a flue Ⅱ (5); The gas boiler detection module (111) comprises a gas boiler (1), an insulating circuit (6), a corrosion detector I (71), a corrosion detector II (72), a corrosion sheet I (81), a corrosion sheet II (82), a flue gas recirculation pipeline (18), a heat network return pipe I (19), a heat network return pipe II (20), a heat network water supply pipe I (21) and a heat network water supply pipe II (22); the heat network return 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 heat network water supply pipe I (21), the heat network water supply pipe I (21) is connected to the heat network water supply pipe II (22), the heat network return pipe II (20), the gas boiler (1), and the heat network water supply pipe II (22) are connected in sequence; The energy saver detection module (222) comprises an energy saver (2), a corrosion detector III (73), a corrosion sheet III (83), an alkali liquid tank (11), an alkali liquid control valve (12), a pH value sensor (17) and a drainage pipe (23); the alkali liquid tank (11), the alkali liquid control valve (12) and the energy saver (2) are connected in sequence, and the pH value sensor (17) is connected to the drainage pipe (23) at the lower end of the energy saver (2); The chimney detection module (333) comprises a chimney (3), a corrosion detector IV (74), a corrosion sheet IV (84), a cathode protection device (13) and an anode sacrificial material (14), wherein the cathode 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) comprises a signal acquisition controller (15), a computer (16), the insulation 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 solution control valve (12), the corrosion detector III (73), the corrosion detector IV (74), the cathode protection device (13) and the pH sensor (17); the insulation 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 cathode protection device (13) and the pH sensor (17) are connected to the signal acquisition controller (15) as signal input ends; the signal acquisition controller (15) outputs a signal to the alkali solution control valve (12); and the signal acquisition controller (15) is connected to the computer (16).

[0017] As a further embodiment of the present invention, the corrosion detector I (71), the corrosion sheet I (81) and the insulating circuit (6) are installed in the smoke transfer chamber at the front end inside the gas boiler (1), the corrosion detector II (72) and the corrosion sheet II (82) are installed in the smoke transfer chamber at the rear end inside the gas boiler (1), and the corrosion detector III (73) and the corrosion sheet III (83) are installed in the rear end flue inside the economizer (2).

[0018] The specific implementation process of the present invention is as follows: in the smoke transfer chamber at the front end of the gas boiler (1), smoke condensation is likely to occur. The corrosion sheet I (81) in the smoke transfer chamber at the front end forms a closed loop with the corrosion detector I (71). The corrosion sheet I (81) is reduced in volume due to corrosion, which increases the resistance and transmits a signal to the corrosion detector I (71). The corrosion detector I (71) transmits the identified signal to the signal acquisition controller (15). When condensed water is generated in the smoke transfer chamber at the front end, the insulating circuit (6) becomes conductive. The insulating circuit (6) transmits smoke condensation information to the signal acquisition controller (15). The corrosion sheet II (82) in the smoke transfer chamber at the rear end of the boiler and the corrosion detector II ( 72) detects the corrosion condition in the high temperature area of ​​the gas boiler (1), and the corrosion detector II (72) transmits the signal to the signal acquisition controller (15); since the flue gas temperature in the furnace of the gas boiler (1) is relatively high, the corrosion detector I (71) and the corrosion detector II (72) are easily damaged, so the heat network return water is used to cool them; 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), and the signal acquisition controller (15) outputs it to the computer (16), and calculates the appropriate air-fuel ratio parameters and flue gas recirculation volume parameters, so as to provide the operator with the gas boiler (1) operation guidance and avoid corrosion in the gas boiler (1).

[0019] The corrosion detector III (73) and the corrosion sheet III (83) detect the corrosion condition of the rear end of the economizer (2) and transmit the signal to the signal acquisition controller (15). The pH sensor (17) detects the pH value of the condensate of the economizer (2) and transmits the signal to the signal acquisition controller (15). The flue gas sensor II (102) detects the flue gas composition 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 solution control valve (12), adjusts the opening of the alkali solution control valve (12), controls the amount of alkali solution delivered from the alkali solution tank (15) to the economizer (2), and ensures that the condensate of the economizer (2) is neutral.

[0020] The corrosion detector IV (74) and the corrosion sheet IV (84) detect the flue gas corrosion in the chimney (3) and transmit the signal to the signal acquisition controller (15). The anti-corrosion measure in 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).

[0021] It should be noted that when the signal acquisition controller (15) identifies 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.

[0022] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gas boiler full-process flue gas corrosion detection and prevention system, characterized in that: include: Gas boiler detection module (111), economizer detection module (222), chimney detection module (333), flue gas corrosion control module (444), flue Ⅰ (4) and flue Ⅱ (5); The gas boiler detection module (111) comprises a gas boiler (1), an insulating circuit (6), a corrosion detector I (71), a corrosion detector II (72), a corrosion sheet I (81), a corrosion sheet II (82), a flue gas recirculation pipeline (18), a heat network return pipe I (19), a heat network return pipe II (20), a heat network water supply pipe I (21) and a heat network water supply pipe II (22); the heat network return 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 heat network water supply pipe I (21), the heat network water supply pipe I (21) is connected to the heat network water supply pipe II (22), the heat network return pipe II (20), the gas boiler (1), and the heat network water supply pipe II (22) are connected in sequence; The energy saver detection module (222) comprises an energy saver (2), a corrosion detector III (73), a corrosion sheet III (83), an alkali liquid tank (11), an alkali liquid control valve (12), a pH value sensor (17) and a drainage pipe (23); the alkali liquid tank (11), the alkali liquid control valve (12) and the energy saver (2) are connected in sequence, and the pH value sensor (17) is connected to the drainage pipe (23) at the lower end of the energy saver (2); The chimney detection module (333) comprises a chimney (3), a corrosion detector IV (74), a corrosion sheet IV (84), a cathode protection device (13) and an anode sacrificial material (14), wherein the cathode 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) comprises a signal acquisition controller (15), a computer (16), the insulation 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 solution control valve (12), the corrosion detector III (73), the corrosion detector IV (74), the cathode protection device (13) and the pH sensor (17); the insulation 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 cathode protection device (13) and the pH sensor (17) are all connected to the signal acquisition controller (15) as signal input ends, the signal acquisition controller (15) outputs a signal to the alkali solution control valve (12), and the signal acquisition controller (15) is connected to the computer (16).

2. According to claim 1, the gas boiler full-process flue gas corrosion detection and prevention system is characterized in that: The corrosion detector I (71), the corrosion sheet I (81) and the insulating circuit (6) are installed in the smoke transfer chamber at the front end inside the gas boiler (1), the corrosion detector II (72) and the corrosion sheet II (82) are installed in the smoke transfer chamber at the rear end inside the gas boiler (1), and the corrosion detector III (73) and the corrosion sheet III (83) are installed in the rear end flue inside the economizer (2).

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