Condensate water corrosion prevention heat exchange device for flue of gas-fired boiler

Abstract

The invention relates to the technical field of gas-fired boiler anti-corrosion equipment, and provides a condensate water corrosion prevention heat exchange device for a gas-fired boiler flue. Comprising a first heat exchange chamber, a second heat exchange chamber, a neutralizing liquid-heat supply network return water heat exchanger, a stirring motor, a neutralizing liquid pump, a neutralizing liquid discharge pipe, an alkali liquid outlet pipe, an alkali liquid tank, a neutralizing liquid outlet pipe, a nozzle, a heat supply network return water pipe, an alkali liquid control valve, a controller, a primary / secondary network water replenishing pipe, a primary / secondary network water replenishing valve and other structures and components. Flue gas sequentially flows to all the heat exchange chambers, step-by-step utilization of flue gas waste heat is achieved, an alkali liquor tank is installed to neutralize acid liquid generated in the operation process of the boiler, meanwhile, a part of neutralizing liquid generated by neutralizing the acid liquid heats secondary net return water, heat of the neutralizing liquid is sprayed to fin heat pipes through nozzles after the neutralizing liquid is utilized, and the heat exchange efficiency is improved. And the fin heat pipe is prevented from being corroded by residual acid liquid, so that not only is the corrosion of the generated harmful acid condensate on equipment efficiently avoided, but also the condensate is subjected to waste recycling, and the energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of gas boiler anti-corrosion equipment, and in particular to a gas boiler flue anti-condensation water corrosion heat exchange device. Background Art

[0002] In order to improve air quality, coal-fired boilers are gradually being replaced by gas-fired boilers. The main component of natural gas is methane (about 90%), so the flue gas produced by the combustion of natural gas contains a large amount of water vapor and carries a large amount of latent heat. In order to improve energy utilization, the waste heat of the flue gas is generally recycled. However, when the flue gas temperature reaches the dew point temperature, CO2 and NOx react chemically with the condensed H20 in the boiler, and the generated acidic condensed water will cause corrosion to the boiler. If the temperature is increased to avoid condensation of water vapor in the flue gas, the waste heat of the flue gas will be wasted to a large extent.

[0003] CN 211400316 U discloses "a novel gas boiler condensate collection system", which collects the condensate of the boiler, the condensate of the economizer, and the condenser into the condensate collector through the water inlet pipe to prevent the condensate from corroding the boiler in the boiler; CN 211232925 U discloses "a flue gas pipeline", which achieves the anti-corrosion effect by applying anti-corrosion paint, and uses the heat-conducting net to absorb the heat of the flue gas to realize the waste heat utilization of the flue gas. However, the current gas boiler anti-condensate corrosion is still not ideal. For example, when the condensate is introduced into a specific recovery area to recover the condensate, it will cause corrosion to the discharge pipeline. At the same time, the condensate may adhere to the pipe wall, the removal effect is not ideal, the anti-corrosion material is unevenly applied, there are dead corners, and the cost is high. Summary of the invention

[0004] The present invention proposes a gas boiler flue anti-condensate corrosion heat exchange device, which solves the problems in the related technology of incomplete discharge of condensate in the boiler and incomplete spraying of anti-corrosion materials, resulting in high investment in boiler anti-corrosion effect but unsatisfactory anti-corrosion effect. At the same time, it can maximize the use of waste heat of flue gas and improve resource utilization.

[0005] The technical solution of the present invention is as follows: A heat exchange device for preventing condensate corrosion in a gas boiler flue, comprising a first heat exchange chamber (1), a second heat exchange chamber (2), a neutralizing liquid-heating network return water heat exchanger (3), a stirring motor (4), a neutralizing liquid pump (5), a neutralizing liquid discharge pipe (6), an alkali liquid outlet pipe (7), an alkali liquid tank (8), a neutralizing liquid outlet pipe (9), a nozzle (91), a heat network return water pipe (10), an alkali liquid control valve (11), a controller (12), a primary / secondary network water supply pipe (13), and a primary / secondary network water supply valve (14); The first heat exchange chamber (1) comprises a first finned heat pipe (16), a first water inlet main pipe (17), and a first water outlet main pipe (18); The second heat exchange chamber (2) comprises a liquid storage tank (15), a liquid collection tank (26), a second finned heat pipe (19), a second water inlet main pipe (20), and a second water outlet main pipe (21); The liquid storage tank (15) comprises a stirrer (22), a liquid level meter (23), and a first pH value sensor (24); The liquid storage tank (15) is located at the lower part of the second heat exchange chamber (2), the stirrer (22) is installed at the bottom end of the liquid storage tank (15), and the shaft of the stirrer (22) is connected to the shaft of the stirring motor (4) by a key; The liquid collecting pool (26) is installed above the liquid storage pool (15) and below the second fin heat pipe (19); One end of the neutralization liquid discharge pipe (6) leads to the liquid storage tank (15), the other end of the neutralization liquid discharge pipe (6) is connected to the hot side inlet of the neutralization liquid-heat network return water heat exchanger (3), and the neutralization liquid pump (5) is installed on the neutralization liquid discharge pipe (6); One end of the neutralizing liquid outlet pipe (9) is connected to the hot side outlet of the neutralizing liquid-heat network return water heat exchanger (3), and the other end of the neutralizing liquid outlet pipe (9) leads to the top of the first heat exchange chamber (1), and a plurality of branch pipes of the neutralizing liquid outlet pipe (9) are evenly distributed with a plurality of nozzles (91); The heat network return water pipe (10) is connected to the cold side inlet of the neutralizing liquid-heat network return water heat exchanger (3), and the second water inlet main pipe (20) is connected to the cold side outlet of the neutralizing liquid-heat network return water heat exchanger (3); The alkali liquid tank (8) is connected to the alkali liquid outlet pipe (7), the alkali liquid outlet pipe (7) leads into the liquid storage tank (15), and the alkali liquid control valve (11) is installed on the alkali liquid outlet pipe (7); The primary / secondary network water supply pipe (13) is connected to the bottom of the liquid storage tank (15), and the primary / secondary network water supply valve (14) is installed on the primary / secondary network water supply pipe (13).

[0006] The wall surface of the liquid collecting pool (26) has a certain slope, and a second pH value sensor (25) is installed in the liquid outlet pipe at the bottom end of the liquid collecting pool (26).

[0007] The controller (12) is connected to the liquid level meter (23), the first pH value sensor (24), the second pH value sensor (25), the alkali solution control valve (11), and the primary / secondary network water supply valve (14); The first pH sensor (24) measures the pH value of the neutralized liquid in the liquid storage tank (15), and the second pH sensor (25) measures the pH value of the liquid in the liquid collection tank (26). The first pH sensor (24) and the second pH sensor (25) send signals to the controller (12). The controller (12) calculates the pH difference between the first pH sensor (24) and the second pH sensor (25) and outputs a signal to the alkali liquid control valve (11). The alkali liquid control valve (11) adjusts the valve opening according to the pH difference. At the same time, the liquid level meter (23) sends a signal to the controller (12), and the primary / secondary network water supply valve (14) receives the signals sent by the first pH value sensor (24) and the liquid level meter (23) from the controller (12) at the same time; when the pH value of the neutralized liquid measured by the first pH value sensor (24) is not neutral, the primary / secondary network water supply valve (14) does not open; when the liquid level meter (23) measures that the liquid level reaches a liquid level threshold, the primary / secondary network water supply valve (14) increases its opening.

[0008] The second finned heat pipe (19) in the first heat exchange chamber (1) is placed horizontally, and the fin surface of the second finned heat pipe (19) is parallel to the direction of flue gas flow and perpendicular to the ground to facilitate the dripping of condensate.

[0009] The working principle of the present invention is as follows: the flue gas flows from the first heat exchange chamber to the second heat exchange chamber for sequential heat exchange. The temperature of the first heat exchange chamber is higher than the dew point temperature of the flue gas. At this time, the flue gas will not produce acidic condensate, and the flue gas will be used for the first waste heat recovery. The temperature of the second heat exchange chamber is lower than the dew point temperature of the flue gas. At this time, the flue gas will produce acidic condensate, and the second heat exchange chamber will recover a large amount of latent heat. The condensate will drip along the vertical fins due to gravity to the liquid collection pool, and then drip into the liquid storage pool after being collected together. At the same time, the alkali valve is opened, and the alkali tank is cooled by alkali. The liquid outlet pipe discharges alkali liquid into the liquid storage tank to neutralize the acidic condensed water. The motor drives the stirrer to evenly mix the condensed water and the alkali liquid. After neutralization, part of the condensed water can be used as primary / secondary network replenishment water, and the other part is used as the heat medium of the neutralizing liquid-heat network return water heat exchanger to heat the secondary network return water flowing through the heat network return water pipe. The secondary network return water then passes through the second heat exchange chamber and the first heat exchange chamber in turn for heating. The neutralized liquid after heat exchange is sprayed onto the finned heat pipe in the second heat exchange chamber through the nozzle of the neutralizing liquid outlet pipe to prevent the finned heat pipe from being corroded by residual acidic liquid.

[0010] The beneficial effects of the present invention are as follows: In order to solve the problems of unsatisfactory boiler anti-corrosion effect and low utilization rate of flue gas waste heat in the related technology, the first heat exchange chamber and the second heat exchange chamber are installed to realize the step-by-step utilization of flue gas waste heat. An alkali liquid tank is installed, and the alkali liquid in the alkali liquid tank neutralizes the acidic liquid generated during the operation of the boiler. At the same time, part of the neutralized liquid generated by neutralizing the acidic liquid is used to heat the secondary network return water, utilizing the heat of the neutralized liquid. Then, the neutralized liquid is sprayed onto the fin heat pipe through the nozzle to avoid the fin heat pipe from being corroded by residual acidic liquid. The other part of the neutralized liquid can be used as primary / secondary network replenishment water. It is achieved that during the operation of the boiler, not only the harmful acidic condensate generated is effectively avoided from corroding the equipment, but also the condensate is recycled and reused as waste to save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] Figure 1 It is an overall schematic diagram of the heat exchange device for preventing condensate corrosion of the flue of a gas boiler according to the present invention; Figure 2 It is a schematic diagram of the internal structure of the heat exchange device for preventing condensate corrosion of the flue of a gas boiler according to the present invention; Figure 3 It is a schematic diagram of the internal structure of the heat exchange device for preventing condensed water corrosion in the flue of a gas boiler according to the present invention from another direction; Figure 4 It is a schematic diagram of a control system of a heat exchange device for preventing condensate corrosion in a gas boiler flue according to the present invention.

[0013] In the figure: a first heat exchange chamber (1); a second heat exchange chamber (2); a neutralizing liquid-heat network return water heat exchanger (3); a stirring motor (4); a neutralizing liquid pump (5); a neutralizing liquid discharge pipe (6); an alkali liquid outlet pipe (7); an alkali liquid tank (8); a neutralizing liquid outlet pipe (9); a nozzle (91); a heat network return water pipe (10); an alkali liquid control valve (11); a controller (12); a primary / secondary network water supply pipe (13); a primary / secondary network water supply valve (14); a liquid storage tank (15); a first finned heat pipe (16); a first water inlet main pipe (17); a first water outlet main pipe (18); a second finned heat pipe (19); a second water inlet main pipe (20); a second water outlet main pipe (21); a stirrer (22); a liquid level meter (23); a first pH value sensor (24); a second pH value sensor (25); and a liquid collection tank (26). DETAILED DESCRIPTION

[0014] 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.

[0015] 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".

[0016] 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 it can be indirectly connected 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.

[0017] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0018] The present invention provides a heat exchange device for preventing condensate corrosion in a gas boiler flue, comprising a first heat exchange chamber (1), a second heat exchange chamber (2), a neutralizing liquid-heat network return water heat exchanger (3), a stirring motor (4), a neutralizing liquid pump (5), a neutralizing liquid discharge pipe (6), an alkali liquid outlet pipe (7), an alkali liquid tank (8), a neutralizing liquid outlet pipe (9), a nozzle (91), a heat network return water pipe (10), an alkali liquid control valve (11), a controller (12), a primary / secondary network water supply pipe (13), and a primary / secondary network water supply valve (14); The first heat exchange chamber (1) comprises a first finned heat pipe (16), a first water inlet main pipe (17), and a first water outlet main pipe (18); The second heat exchange chamber (2) comprises a liquid storage tank (15), a liquid collection tank (26), a second finned heat pipe (19), a second water inlet main pipe (20), and a second water outlet main pipe (21); The liquid storage tank (15) comprises a stirrer (22), a liquid level meter (23), and a first pH value sensor (24); The liquid storage tank (15) is located at the lower part of the second heat exchange chamber (2), the stirrer (22) is installed at the bottom end of the liquid storage tank (15), and the shaft of the stirrer (22) is connected to the shaft of the stirring motor (4) by a key; The liquid collecting pool (26) is installed above the liquid storage pool (15) and below the second fin heat pipe (19); One end of the neutralization liquid discharge pipe (6) leads to the liquid storage tank (15), the other end of the neutralization liquid discharge pipe (6) is connected to the hot side inlet of the neutralization liquid-heat network return water heat exchanger (3), and the neutralization liquid pump (5) is installed on the neutralization liquid discharge pipe (6); One end of the neutralizing liquid outlet pipe (9) is connected to the hot side outlet of the neutralizing liquid-heat network return water heat exchanger (3), and the other end of the neutralizing liquid outlet pipe (9) leads to the top of the first heat exchange chamber (1), and a plurality of branch pipes of the neutralizing liquid outlet pipe (9) are evenly distributed with a plurality of nozzles (91); The heat network return water pipe (10) is connected to the cold side inlet of the neutralizing liquid-heat network return water heat exchanger (3), and the second water inlet main pipe (20) is connected to the cold side outlet of the neutralizing liquid-heat network return water heat exchanger (3); The alkali liquid tank (8) is connected to the alkali liquid outlet pipe (7), the alkali liquid outlet pipe (7) leads into the liquid storage tank (15), and the alkali liquid control valve (11) is installed on the alkali liquid outlet pipe (7); The primary / secondary network water supply pipe (13) is connected to the bottom of the liquid storage tank (15), and the primary / secondary network water supply valve (14) is installed on the primary / secondary network water supply pipe (13).

[0019] The wall surface of the liquid collecting pool (26) has a certain slope, and a second pH value sensor (25) is installed in the liquid outlet pipe at the bottom end of the liquid collecting pool (26).

[0020] The controller (12) is connected to the liquid level meter (23), the first pH value sensor (24), the second pH value sensor (25), the alkali solution control valve (11), and the primary / secondary network water supply valve (14); The first pH sensor (24) measures the pH value of the neutralized liquid in the liquid storage tank (15), and the second pH sensor (25) measures the pH value of the liquid in the liquid collection tank (26). The first pH sensor (24) and the second pH sensor (25) send signals to the controller (12). The controller (12) calculates the pH difference between the first pH sensor (24) and the second pH sensor (25) and outputs a signal to the alkali liquid control valve (11). The alkali liquid control valve (11) adjusts the valve opening according to the pH difference. At the same time, the liquid level meter (23) sends a signal to the controller (12), and the primary / secondary network water supply valve (14) receives the signals sent by the first pH value sensor (24) and the liquid level meter (23) from the controller (12) at the same time; when the pH value of the neutralized liquid measured by the first pH value sensor (24) is not neutral, the primary / secondary network water supply valve (14) does not open; when the liquid level meter (23) measures that the liquid level reaches a liquid level threshold, the primary / secondary network water supply valve (14) increases its opening.

[0021] The second finned heat pipe (19) in the first heat exchange chamber (1) is placed horizontally, and the fin surface of the second finned heat pipe (19) is parallel to the direction of flue gas flow and perpendicular to the ground to facilitate the dripping of condensate. Embodiment 1:

[0022] The present invention provides a heat exchange device for preventing condensate corrosion in a gas boiler flue, comprising a first heat exchange chamber (1), a second heat exchange chamber (2), a neutralizing liquid-heat network return water heat exchanger (3), a stirring motor (4), a neutralizing liquid pump (5), a neutralizing liquid discharge pipe (6), an alkali liquid outlet pipe (7), an alkali liquid tank (8), a neutralizing liquid outlet pipe (9), a nozzle (91), a heat network return water pipe (10), an alkali liquid control valve (11), a controller (12), a primary / secondary network water supply pipe (13), and a primary / secondary network water supply valve (14); The first heat exchange chamber (1) comprises a first finned heat pipe (16), a first water inlet main pipe (17), and a first water outlet main pipe (18); The second heat exchange chamber (2) comprises a liquid storage tank (15), a liquid collection tank (26), a second finned heat pipe (19), a second water inlet main pipe (20), and a second water outlet main pipe (21); The liquid storage tank (15) comprises a stirrer (22), a liquid level meter (23), and a first pH value sensor (24); The liquid storage tank (15) is located at the lower part of the second heat exchange chamber (2), the stirrer (22) is installed at the bottom end of the liquid storage tank (15), and the shaft of the stirrer (22) is connected to the shaft of the stirring motor (4) by a key; The liquid collecting pool (26) is installed above the liquid storage pool (15) and below the second fin heat pipe (19); One end of the neutralization liquid discharge pipe (6) leads to the liquid storage tank (15), the other end of the neutralization liquid discharge pipe (6) is connected to the hot side inlet of the neutralization liquid-heat network return water heat exchanger (3), and the neutralization liquid pump (5) is installed on the neutralization liquid discharge pipe (6); One end of the neutralizing liquid outlet pipe (9) is connected to the hot side outlet of the neutralizing liquid-heat network return water heat exchanger (3), and the other end of the neutralizing liquid outlet pipe (9) leads to the top of the first heat exchange chamber (1), and a plurality of branch pipes of the neutralizing liquid outlet pipe (9) are evenly distributed with a plurality of nozzles (91); The heat network return water pipe (10) is connected to the cold side inlet of the neutralizing liquid-heat network return water heat exchanger (3), and the second water inlet main pipe (20) is connected to the cold side outlet of the neutralizing liquid-heat network return water heat exchanger (3); The alkali liquid tank (8) is connected to the alkali liquid outlet pipe (7), the alkali liquid outlet pipe (7) leads into the liquid storage tank (15), and the alkali liquid control valve (11) is installed on the alkali liquid outlet pipe (7); The primary / secondary network water supply pipe (13) is connected to the bottom of the liquid storage tank (15), and the primary / secondary network water supply valve (14) is installed on the primary / secondary network water supply pipe (13).

[0023] The wall surface of the liquid collecting pool (26) has a certain slope, and a second pH value sensor (25) is installed in the liquid outlet pipe at the bottom end of the liquid collecting pool (26).

[0024] The controller (12) is connected to the liquid level meter (23), the first pH value sensor (24), the second pH value sensor (25), the alkali solution control valve (11), and the primary / secondary network water supply valve (14); The first pH sensor (24) measures the pH value of the neutralized liquid in the liquid storage tank (15), and the second pH sensor (25) measures the pH value of the liquid in the liquid collection tank (26). The first pH sensor (24) and the second pH sensor (25) send signals to the controller (12). The controller (12) calculates the pH difference between the first pH sensor (24) and the second pH sensor (25) and outputs a signal to the alkali liquid control valve (11). The alkali liquid control valve (11) adjusts the valve opening according to the pH difference. At the same time, the liquid level meter (23) sends a signal to the controller (12), and the primary / secondary network water supply valve (14) receives the signals sent by the first pH value sensor (24) and the liquid level meter (23) from the controller (12) at the same time; when the pH value of the neutralized liquid measured by the first pH value sensor (24) is not neutral, the primary / secondary network water supply valve (14) does not open; when the liquid level meter (23) measures that the liquid level reaches a liquid level threshold, the primary / secondary network water supply valve (14) increases its opening.

[0025] The second finned heat pipe (19) in the first heat exchange chamber (1) is placed horizontally, and the fin surface of the second finned heat pipe (19) is parallel to the direction of flue gas flow and perpendicular to the ground to facilitate the dripping of condensate.

[0026] The working principle is as follows: the flue gas flows through the first heat exchange chamber (1) to the second heat exchange chamber (2) for sequential heat exchange. The temperature of the first heat exchange chamber (1) is higher than the dew point temperature of the flue gas. At this time, the flue gas does not produce acidic condensate, and the flue gas performs the first waste heat recovery. The temperature of the second heat exchange chamber (2) is lower than the dew point temperature of the flue gas. At this time, the flue gas produces acidic condensate. The second heat exchange chamber (2) recovers a large amount of latent heat. Due to the effect of gravity, the condensate drips along the vertical fins into the liquid collection pool (26). A second pH sensor (25) is installed at the bottom of the liquid collection pool (26) to detect the pH value of the dripping condensate. The condensate then flows into the liquid storage tank (15). At the same time, The alkali liquid control valve (11) is opened, the alkali liquid tank (8) discharges alkali liquid into the liquid storage tank (15) through the alkali liquid outlet pipe to neutralize the acidic condensed water, the motor (4) drives the stirrer (22) to evenly stir the condensed water and the alkali liquid, the first pH value sensor (24) detects the pH value of the condensed liquid after neutralization, the first pH value sensor (24) and the second pH value sensor (25) send signals to the controller, the controller (12) calculates the pH value difference measured by the first pH value sensor (24) and the second pH value sensor (25), the controller (12) then outputs the signal to the alkali liquid control valve (11), and the alkali liquid control valve (11) adjusts the opening according to the pH value difference. After neutralization, a portion of the condensed water can be used as primary / secondary network replenishment water, and the other portion is used as the heat medium of the neutralizing liquid-heat network return water heat exchanger (3) to heat the secondary network return water flowing through the heat network return water pipe. The secondary network return water then passes through the second heat exchange chamber (2) and the first heat exchange chamber (1) in sequence for heating. The neutralized liquid after heat exchange is sprayed onto the finned heat pipe in the second heat exchange chamber (2) through the nozzle (91) of the neutralizing liquid outlet pipe (9) to prevent the finned heat pipe from being corroded by residual acidic liquid.

[0027] At the same time, the liquid level meter sends a signal to the controller (12), and the primary / secondary network water supply valve receives signals from the first pH value sensor (24) and the liquid level meter (23) from the controller (12) at the same time. When the pH value of the neutralizing liquid measured by the first pH value sensor (24) is not neutral, the primary / secondary network water supply valve (14) does not open. When the liquid level measured by the liquid level meter (23) reaches a liquid level threshold, the primary / secondary network water supply valve (14) increases its opening.

[0028] The preferred embodiments of the present invention are merely illustrative. The preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made based on the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and use the invention.

Claims

1. A heat exchange device for preventing condensed water corrosion in a gas boiler flue, characterized in that: It comprises a first heat exchange chamber (1), a second heat exchange chamber (2), a neutralizing liquid-heat network return water heat exchanger (3), a stirring motor (4), a neutralizing liquid pump (5), a neutralizing liquid discharge pipe (6), an alkali liquid outlet pipe (7), an alkali liquid tank (8), a neutralizing liquid outlet pipe (9), a nozzle (91), a heat network return water pipe (10), an alkali liquid control valve (11), a controller (12), a primary / secondary network water supply pipe (13), and a primary / secondary network water supply valve (14); The first heat exchange chamber (1) comprises a first finned heat pipe (16), a first water inlet main pipe (17), and a first water outlet main pipe (18); The second heat exchange chamber (2) comprises a liquid storage tank (15), a liquid collection tank (26), a second finned heat pipe (19), a second water inlet main pipe (20), and a second water outlet main pipe (21); The liquid storage tank (15) comprises a stirrer (22), a liquid level meter (23), and a first pH value sensor (24); The liquid storage tank (15) is located at the lower part of the second heat exchange chamber (2), the stirrer (22) is installed at the bottom end of the liquid storage tank (15), and the shaft of the stirrer (22) is connected to the shaft of the stirring motor (4) by a key; The liquid collecting pool (26) is installed above the liquid storage pool (15) and below the second fin heat pipe (19); One end of the neutralization liquid discharge pipe (6) leads to the liquid storage tank (15), the other end of the neutralization liquid discharge pipe (6) is connected to the hot side inlet of the neutralization liquid-heat network return water heat exchanger (3), and the neutralization liquid pump (5) is installed on the neutralization liquid discharge pipe (6); One end of the neutralizing liquid outlet pipe (9) is connected to the hot side outlet of the neutralizing liquid-heat network return water heat exchanger (3), and the other end of the neutralizing liquid outlet pipe (9) leads to the top of the first heat exchange chamber (1), and a plurality of branch pipes of the neutralizing liquid outlet pipe (9) are evenly distributed with a plurality of nozzles (91); The heat network return water pipe (10) is connected to the cold side inlet of the neutralizing liquid-heat network return water heat exchanger (3), and the second water inlet main pipe (20) is connected to the cold side outlet of the neutralizing liquid-heat network return water heat exchanger (3); The alkali liquid tank (8) is connected to the alkali liquid outlet pipe (7), the alkali liquid outlet pipe (7) leads into the liquid storage tank (15), and the alkali liquid control valve (11) is installed on the alkali liquid outlet pipe (7); The primary / secondary network water supply pipe (13) is connected to the bottom of the liquid storage tank (15), and the primary / secondary network water supply valve (14) is installed on the primary / secondary network water supply pipe (13).

2. The gas boiler flue anti-condensation water corrosion heat exchange device according to claim 1 is characterized in that: The wall surface of the liquid collecting pool (26) has a certain slope, and a second pH value sensor (25) is installed in the liquid outlet pipe at the bottom end of the liquid collecting pool (26).

3. The gas boiler flue anti-condensation water corrosion heat exchange device according to claim 1, characterized in that: The controller (12) is connected to the liquid level meter (23), the first pH value sensor (24), the second pH value sensor (25), the alkali solution control valve (11), and the primary / secondary network water supply valve (14); The first pH sensor (24) measures the pH value of the neutralized liquid in the liquid storage tank (15), and the second pH sensor (25) measures the pH value of the liquid in the liquid collection tank (26). The first pH sensor (24) and the second pH sensor (25) send signals to the controller (12). The controller (12) calculates the pH difference between the first pH sensor (24) and the second pH sensor (25) and outputs a signal to the alkali liquid control valve (11). The alkali liquid control valve (11) adjusts the valve opening according to the pH difference. At the same time, the liquid level meter (23) sends a signal to the controller (12), and the primary / secondary network water supply valve (14) receives the signals sent by the first pH value sensor (24) and the liquid level meter (23) from the controller (12) at the same time; when the pH value of the neutralized liquid measured by the first pH value sensor (24) is not neutral, the primary / secondary network water supply valve (14) does not open; when the liquid level meter (23) measures that the liquid level reaches a liquid level threshold, the primary / secondary network water supply valve (14) increases its opening.

4. The gas boiler flue anti-condensation water corrosion heat exchange device according to claim 1, characterized in that: The second finned heat pipe (19) in the first heat exchange chamber (1) is placed horizontally, and the fin surface of the second finned heat pipe (19) is parallel to the direction of flue gas flow and perpendicular to the ground to facilitate the dripping of condensate.

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