A condensing gas steam boiler water supply system and its usage method

Abstract

A condensing gas steam boiler water supply system and its usage method belong to the technical field of gas steam boilers, and solve the technical problem of unreasonable design of the existing boiler water supply pipeline. The solution is as follows: A condensing gas steam boiler water supply system includes a drum, an electrode type water level gauge, a boiler controller, a soft water tank, a condenser, an economizer, a first water pump, a second water pump and connecting water pipes; the electrode type water level gauge is arranged on the side wall of the drum, and the electrode type water level gauge is electrically connected to the boiler controller; the economizer and the condenser are arranged along the flowing direction of the boiler flue gas, and there is a spacing distance between the economizer and the condenser. The present invention utilizes the combined action of the boiler electrode type water level gauge, the boiler controller and the solenoid valve to enable reliable water supply to the drum, and the economizer and the condenser can be fully cooled, so that the flue gas temperature can be reduced to about 50 °C, meeting the energy saving requirements; at the same time, the economizer and the condenser can be flexibly put into operation and taken out of service, facilitating maintenance and replacement.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas steam boilers, and specifically relates to a condensing gas steam boiler water supply system and a method for using the same. Background Art

[0002] Gas steam boilers are widely used in industrial production and social life. According to the requirements of relevant boiler specifications, economizers and condensers are installed in the tail flue of most gas steam boilers to reduce the boiler flue gas temperature, obtain a higher boiler thermal efficiency, and improve the economy of boiler operation.

[0003] According to different user usage scenarios, the load change range of condensing gas steam boilers is relatively large, and the water supply to the boiler drum is intermittent. As important components of the condensing boiler, the steam condenser and the economizer are independently arranged on the rear flue of the boiler body and should be reliably cooled at any load of the boiler so that the flue gas temperature can reach about 50°C. A reasonable design of the boiler water supply pipeline is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] The main purpose of the present invention is to overcome the deficiencies in the prior art, solve the problems existing in the prior art, and provide a condensing gas steam boiler water supply system and a method for using the same.

[0005] The present invention is achieved through the following technical solutions: A condensing gas steam boiler water supply system includes a boiler drum, an electrode type water level gauge, a boiler controller, a soft water tank, a condenser, an economizer, a first water pump, a second water pump, and connecting water pipes; the electrode type water level gauge is arranged on the side wall of the boiler drum, and the electrode type water level gauge is electrically connected to the boiler controller; the economizer and the condenser are arranged in sequence along the direction of boiler flue gas flow, wherein:

[0006] The water outlet of the soft water tank is communicated with a horizontal interface of a first three-way joint through a connecting water pipe, another horizontal interface of the first three-way joint is communicated with the water inlet of the first water pump through a connecting water pipe, the water outlet of the first water pump is communicated with a horizontal interface of a second three-way joint through a connecting water pipe, another horizontal interface of the second three-way joint is communicated with a horizontal interface of a third three-way joint, another horizontal interface of the third three-way joint is communicated with a horizontal interface of a fourth three-way joint through a connecting water pipe, another horizontal interface of the fourth three-way joint is communicated with a horizontal interface of a fifth three-way joint through a connecting water pipe, another horizontal interface of the fifth three-way joint is communicated with a horizontal interface of a four-way joint through a connecting water pipe, and another horizontal interface of the four-way joint is communicated with the water inlet of the soft water tank through a connecting water pipe;

[0007] The vertical interface of the first three-way joint is connected to the water inlet of the second feed pump through a connecting water pipe, and the water outlet of the second feed pump is connected to the vertical interface of the second three-way joint through a connecting water pipe;

[0008] The vertical interface of the third three-way joint is connected to the condenser water inlet through a connecting water pipe, and the condenser water outlet is connected to the vertical interface of the fourth three-way joint through a connecting water pipe; the vertical interface of the fifth three-way joint is connected to the economizer water inlet through a connecting water pipe, and the economizer water outlet is connected to a vertical interface of the four-way joint through a connecting water pipe, and the other vertical interface of the four-way joint is connected to the water inlet of the boiler drum through a connecting water pipe;

[0009] Stop valves are installed on the connecting water pipes between the first three-way joint and the first feed pump, between the first feed pump and the second three-way joint, between the first three-way joint and the second feed pump, between the second feed pump and the second three-way joint, between the third three-way joint and the fourth three-way joint, between the third three-way joint and the condenser, between the condenser and the fourth three-way joint, between the fifth three-way joint and the economizer, between the economizer and the four-way joint, and between the fifth three-way joint and the four-way joint;

[0010] Solenoid valves are installed on the connecting water pipe between the four-way joint and the soft water tank, and a solenoid valve and a check valve are installed on the connecting water pipe between the four-way joint and the boiler drum.

[0011] A method for using a condensing gas steam boiler water supply system. When the gas steam boiler is in normal or abnormal working conditions, according to the water level in the boiler drum, by controlling the opening and closing of the valves on the connecting pipes between the condenser, economizer and the boiler drum, water supply to the boiler through different water supply pipelines is achieved. The "normal working condition" of the gas steam boiler refers to: the operating parameters (pressure and temperature) of the gas steam boiler are stable, the combustion condition is good (the flame form is normal and the combustion efficiency is high), the operating sound is normal, and all components are intact, and the gas steam boiler is in a normal working state as a whole; the "abnormal working condition" of the gas steam boiler refers to: the economizer or condenser of the boiler leaks, or even the economizer or condenser does not work, and the economizer or condenser needs to be isolated from the system.

[0012] Furthermore, the method for using the condensing gas steam boiler water supply system specifically includes the following usage methods under different working conditions:

[0013] 1. Under the normal working condition of the gas steam boiler:

[0014] 1) When the drum water level is within the normal water level range (note: the position of the "normal water level" is different for boilers of different models, but the rated range of the "normal water level" corresponding to the boiler model will be clearly stated when the boiler leaves the factory), the boiler is supplied with water through the first water supply pipeline. The first water supply pipeline is as follows: close the stop valve between the third three-way joint and the fourth three-way joint, the stop valve between the fifth three-way joint and the four-way joint, and the solenoid valve between the four-way joint and the soft water tank. At the same time, close the stop valve between the first three-way joint and the first water pump, and between the first water pump and the second three-way joint, or close the stop valve between the first three-way joint and the second water pump, and between the second water pump and the second three-way joint. Open the remaining valves; the water in the soft water tank is pressurized by the first water pump or the second water pump and flows through the condenser and the economizer in sequence and then enters the drum;

[0015] 2) When the drum water level is at least 30 mm above the upper limit of the normal water level (i.e., in the high water level range), the boiler feed water returns to the soft water tank through the first water supply bypass. The first water supply bypass is as follows: close the stop valve between the third three-way joint and the fourth three-way joint, the stop valve between the fifth three-way joint and the four-way joint, and the solenoid valve between the four-way joint and the drum. At the same time, close the stop valve between the first three-way joint and the first water pump, and between the first water pump and the second three-way joint, or close the stop valve between the first three-way joint and the second water pump, and between the second water pump and the second three-way joint. Open the remaining valves; the water in the soft water tank is pressurized by the first water pump or the second water pump and flows through the condenser and the economizer in sequence and then returns to the soft water tank;

[0016] 2. Condenser disconnection under abnormal working conditions of the gas steam boiler:

[0017] 1) When the drum water level is within the normal water level range, the boiler is supplied with water through the second water supply pipeline. The second water supply pipeline is as follows: close the stop valve between the third three-way joint and the condenser, the stop valve between the condenser and the fourth three-way joint, the stop valve between the fifth three-way joint and the four-way joint, and the solenoid valve between the four-way joint and the soft water tank. At the same time, close the stop valve between the first three-way joint and the first water pump, and between the first water pump and the second three-way joint, or close the stop valve between the first three-way joint and the second water pump, and between the second water pump and the second three-way joint. Open the remaining valves; the water in the soft water tank is pressurized by the first water pump or the second water pump and flows through the economizer and then enters the drum;

[0018] 2) When the drum water level is at least 30 mm above the upper limit of the normal water level, the boiler feed water returns to the soft water tank through the second feed water bypass. The second feed water bypass is as follows: close the stop valves between the third three-way joint and the condenser, between the condenser and the fourth three-way joint, between the fifth three-way joint and the four-way joint, and the solenoid valve between the four-way joint and the drum. At the same time, close the stop valves between the first three-way joint and the first feed water pump, and between the first feed water pump and the second three-way joint, or close the stop valves between the first three-way joint and the second feed water pump, and between the second feed water pump and the second three-way joint. Open the remaining valves. The water in the soft water tank is pressurized by the first feed water pump or the second feed water pump, flows through the economizer, and then returns to the soft water tank.

[0019] 3. When the economizer is taken out of service under abnormal operating conditions of the gas steam boiler:

[0020] 1) When the drum water level is within the normal water level range, the boiler is supplied with water through the third feed water pipeline. The third feed water pipeline is as follows: close the stop valve between the third three-way joint and the fourth three-way joint, the stop valve between the fifth three-way joint and the economizer, the stop valve between the economizer and the four-way joint, and the solenoid valve between the four-way joint and the soft water tank. At the same time, close the stop valves between the first three-way joint and the first feed water pump, and between the first feed water pump and the second three-way joint, or close the stop valves between the first three-way joint and the second feed water pump, and between the second feed water pump and the second three-way joint. Open the remaining valves. The water in the soft water tank is pressurized by the first feed water pump or the second feed water pump, flows through the condenser, and then enters the drum.

[0021] 2) When the drum water level is at least 30 mm above the upper limit of the normal water level, the boiler feed water returns to the soft water tank through the third feed water bypass. The third feed water bypass is as follows: close the stop valve between the third three-way joint and the fourth three-way joint, the stop valve between the fifth three-way joint and the economizer, the stop valve between the economizer and the four-way joint, and the solenoid valve between the four-way joint and the drum. At the same time, close the stop valves between the first three-way joint and the first feed water pump, and between the first feed water pump and the second three-way joint, or close the stop valves between the first three-way joint and the second feed water pump, and between the second feed water pump and the second three-way joint. Open the remaining valves. The water in the soft water tank is pressurized by the first feed water pump or the second feed water pump, flows through the condenser, and then returns to the soft water tank.

[0022] 4. When the condenser and the economizer are taken out of service under abnormal operating conditions of the gas steam boiler:

[0023] 1), when the drum water level is within the normal water level range, the boiler is supplied with water through the fourth water supply pipeline. The fourth water supply pipeline is as follows: close the stop valves between the third three-way joint and the condenser, between the condenser and the fourth three-way joint, between the fifth three-way joint and the economizer, between the economizer and the four-way joint, and the solenoid valve between the four-way joint and the soft water tank. At the same time, close the stop valves between the first three-way joint and the first water pump, between the first water pump and the second three-way joint, or close the stop valves between the first three-way joint and the second water pump, between the second water pump and the second three-way joint. Open the remaining valves; the water in the soft water tank is pressurized by the first water pump or the second water pump and then enters the drum;

[0024] 2), when the condenser and the economizer are disconnected under abnormal operating conditions of the gas steam boiler, and the drum water level is at least 30 mm above the upper limit of the normal water level, the boiler feed water returns to the soft water tank through the fourth feed water bypass. The fourth feed water bypass is as follows: close the stop valves between the third three-way joint and the condenser, between the condenser and the fourth three-way joint, between the fifth three-way joint and the economizer, between the economizer and the four-way joint, and the solenoid valve between the four-way joint and the drum. At the same time, close the stop valves between the first three-way joint and the first water pump, between the first water pump and the second three-way joint, or close the stop valves between the first three-way joint and the second water pump, between the second water pump and the second three-way joint. Open the remaining valves; the water in the soft water tank is pressurized by the first water pump or the second water pump and then returns to the soft water tank.

[0025] The beneficial effects of the present invention are:

[0026] In the present invention, the design of the feed water pipeline of the condensing gas steam boiler can adapt to various load conditions of the boiler. By the combined action of the boiler electrode water level gauge, the boiler controller, and the solenoid valve, the drum can be reliably supplied with water, and the economizer and the condenser can be fully cooled, so that the flue gas temperature can be reduced to about 50 °C, meeting the energy-saving requirements; at the same time, the economizer and the condenser can be flexibly put into operation and disconnected, facilitating maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0029] As Figure 1A condensate gas steam boiler water supply system shown in the figure includes a boiler drum 1, an electrode type water level gauge 2, a boiler controller 3, a soft water tank 4, a condenser 5, an economizer 6, a first feed water pump 9, a second feed water pump 7 and connecting water pipes; the electrode type water level gauge 2 is arranged on the side wall of the boiler drum 1, and the electrode type water level gauge 2 is electrically connected with the boiler controller 3; the economizer 6 and the condenser 5 are arranged along the flow direction of the boiler flue gas, and there is a distance interval between the economizer 6 and the condenser 5, where:

[0030] The water outlet of the soft water tank 4 is communicated with a horizontal interface of a first three-way joint 8 through a connecting water pipe, another horizontal interface of the first three-way joint 8 is communicated with the water inlet of the first feed water pump 9 through a connecting water pipe, the water outlet of the first feed water pump 9 is communicated with a horizontal interface of a second three-way joint 10 through a connecting water pipe, another horizontal interface of the second three-way joint 10 is communicated with a horizontal interface of a third three-way joint 11, another horizontal interface of the third three-way joint 11 is communicated with a horizontal interface of a fourth three-way joint 12 through a connecting water pipe, another horizontal interface of the fourth three-way joint 12 is communicated with a horizontal interface of a fifth three-way joint 13 through a connecting water pipe, another horizontal interface of the fifth three-way joint 13 is communicated with a horizontal interface of a four-way joint 14 through a connecting water pipe, and another horizontal interface of the four-way joint 14 is communicated with the water inlet of the soft water tank 4 through a connecting water pipe;

[0031] The vertical interface of the first three-way joint 8 is communicated with the water inlet of the second feed water pump 7 through a connecting water pipe, and the water outlet of the second feed water pump 7 is communicated with the vertical interface of the second three-way joint 10 through a connecting water pipe;

[0032] The vertical interface of the third three-way joint 11 is communicated with the water inlet of the condenser 5 through a connecting water pipe, and the water outlet of the condenser 5 is communicated with the vertical interface of the fourth three-way joint 12 through a connecting water pipe; the vertical interface of the fifth three-way joint 13 is communicated with the water inlet of the economizer 6 through a connecting water pipe, the water outlet of the economizer 6 is communicated with a vertical interface of the four-way joint 14 through a connecting water pipe, and another vertical interface of the four-way joint 14 is communicated with the water inlet of the boiler drum 1 through a connecting water pipe;

[0033] Stop valves are installed on the connecting water pipes between the first three-way joint 8 and the first feed water pump 9, between the first feed water pump 9 and the second three-way joint 10, between the first three-way joint 8 and the second feed water pump 7, between the second feed water pump 7 and the second three-way joint 10, between the third three-way joint 11 and the fourth three-way joint 12, between the third three-way joint 11 and the condenser 5, between the condenser 5 and the fourth three-way joint 12, between the fifth three-way joint 13 and the economizer 6, between the economizer 6 and the four-way joint 14, and between the fifth three-way joint 13 and the four-way joint 14;

[0034] An electromagnetic valve is installed on the connecting water pipe between the four-way joint 14 and the soft water tank 4, and an electromagnetic valve and a check valve are installed on the connecting water pipe between the four-way joint 14 and the boiler drum 1.

[0035] A method for using a water supply system of a condensing gas steam boiler. When the gas steam boiler is in normal or abnormal working conditions, according to the water level in the boiler drum 1, by controlling the opening and closing of the valves on the connecting pipes between the condenser 5, the economizer 6 and the boiler drum 1, water supply to the boiler is achieved through different water supply pipes. The method for using the water supply system of the condensing gas steam boiler specifically includes the following methods for use in different working conditions:

[0036] 1) When the gas steam boiler is in normal working conditions and the water level in the boiler drum 1 is within the normal water level range, water is supplied to the boiler through the first water supply pipe;

[0037] 2) When the gas steam boiler is in normal working conditions and the water level in the boiler drum 1 is at least 30 mm above the upper limit of the normal water level, the boiler feed water returns to the soft water tank 4 through the first water supply bypass;

[0038] 3) When the condenser 5 is taken out of service under abnormal working conditions of the gas steam boiler and the water level in the boiler drum 1 is within the normal water level range, water is supplied to the boiler through the second water supply pipe;

[0039] 4) When the condenser 5 is taken out of service under abnormal working conditions of the gas steam boiler and the water level in the boiler drum 1 is at least 30 mm above the upper limit of the normal water level, the boiler feed water returns to the soft water tank 4 through the second water supply bypass;

[0040] 5) When the economizer 6 is taken out of service under abnormal working conditions of the gas steam boiler and the water level in the boiler drum 1 is within the normal water level range, water is supplied to the boiler through the third water supply pipe;

[0041] 6) When the economizer 6 is taken out of service under abnormal working conditions of the gas steam boiler and the water level in the boiler drum 1 is at least 30 mm above the upper limit of the normal water level, the boiler feed water returns to the soft water tank 4 through the third water supply bypass;

[0042] 7) When the condenser 5 and the economizer 6 are taken out of service under abnormal working conditions of the gas steam boiler and the water level in the boiler drum 1 is within the normal water level range, water is supplied to the boiler through the fourth water supply pipe;

[0043] 8) When the condenser 5 and the economizer 6 are taken out of service under abnormal working conditions of the gas steam boiler and the water level in the boiler drum 1 is at least 30 mm above the upper limit of the normal water level, the boiler feed water returns to the soft water tank 4 through the fourth water supply bypass;

[0044] The present invention includes the following groups of circulating pipelines:

[0045] First feed water pipeline: Close the stop valves between the third three-way joint 11 and the fourth three-way joint 12, between the fifth three-way joint 13 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the soft water tank 4. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7 and flows through the condenser 5 and the economizer 6 in sequence and then enters the boiler drum 1.

[0046] First feed water bypass: The first feed water bypass closes the stop valves between the third three-way joint 11 and the fourth three-way joint 12, between the fifth three-way joint 13 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the boiler drum 1. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7 and flows through the condenser 5 and the economizer 6 in sequence and then returns to the soft water tank 4.

[0047] Second feed water pipeline: Close the stop valves between the third three-way joint 11 and the condenser 5, between the condenser 5 and the fourth three-way joint 12, between the fifth three-way joint 13 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the soft water tank 4. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7 and flows through the economizer 6 and then enters the boiler drum 1.

[0048] Second feed water bypass: Close the stop valves between the third three-way joint 11 and the condenser 5, between the condenser 5 and the fourth three-way joint 12, between the fifth three-way joint 13 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the boiler drum 1. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7 and flows through the economizer 6 and then returns to the soft water tank 4.

[0049] Third feed water pipeline: Close the stop valves between the third three-way joint 11 and the fourth three-way joint 12, between the fifth three-way joint 13 and the economizer 6, between the economizer 6 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the soft water tank 4. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, and between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, and between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7, flows through the condenser 5, and then enters the boiler drum 1.

[0050] Third feed water bypass: Close the stop valves between the third three-way joint 11 and the fourth three-way joint 12, between the fifth three-way joint 13 and the economizer 6, between the economizer 6 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the boiler drum 1. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, and between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, and between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7, flows through the condenser 5, and then returns to the soft water tank 4.

[0051] Fourth feed water pipeline: Close the stop valves between the third three-way joint 11 and the condenser 5, between the condenser 5 and the fourth three-way joint 12, between the fifth three-way joint 13 and the economizer 6, between the economizer 6 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the soft water tank 4. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, and between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, and between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7 and then enters the boiler drum 1.

[0052] Fourth feed water bypass: The fourth feed water bypass closes the stop valves between the third three-way joint 11 and the condenser 5, between the condenser 5 and the fourth three-way joint 12, between the fifth three-way joint 13 and the economizer 6, between the economizer 6 and the four-way joint 14, and the solenoid valve between the four-way joint 14 and the boiler drum 1. At the same time, close the stop valves between the first three-way joint 8 and the first feed water pump 9, and between the first feed water pump 9 and the second three-way joint 10, or close the stop valves between the first three-way joint 8 and the second feed water pump 7, and between the second feed water pump 7 and the second three-way joint 10. Open the remaining valves. The water in the soft water tank 4 is pressurized by the first feed water pump 9 or the second feed water pump 7 and then returns to the soft water tank 4.

[0053] Working principle and process of the present invention:

[0054] When the condensing gas steam boiler is in the high-load working condition, the feed water volume of the boiler is adapted to the evaporation volume, the boiler water level is within the normal water level range, and the boiler feed water enters the drum after passing through the condenser 5 and the economizer 6;

[0055] When the condensing gas steam boiler is in the low-load working condition, the feed water volume of the boiler is greater than the evaporation volume, and the boiler water level will continuously rise. When it reaches the high water level, the high water level signal provided by the electrode type water level gauge 2, through the boiler controller 3, makes the boiler feed water return to the soft water tank 4 through the bypass; as the boiler continues to operate, the boiler water level gradually drops. When it reaches the low water level, the low water level signal provided by the electrode type water level gauge 2, through the boiler controller 3, makes the boiler feed water enter the drum 1.

[0056] As mentioned above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A method for using a condensing gas steam boiler water supply system, characterized in that: A condensing gas steam boiler water supply system comprises a boiler drum (1), an electrode water level gauge (2), a boiler controller (3), a soft water tank (4), a condenser (5), an economizer (6), a first water supply pump (9), a second water supply pump (7) and a connecting water pipe; the electrode water level gauge (2) is arranged on the side wall of the boiler drum (1), and the electrode water level gauge (2) is electrically connected to the boiler controller (3); the economizer (6) and the condenser (5) are arranged in sequence along the flow direction of boiler flue gas, and the system is characterized in that: The water outlet of the soft water tank (4) is connected to a horizontal interface of the first three-way joint (8) through a connecting water pipe, the other horizontal interface of the first three-way joint (8) is connected to the water inlet of the first water supply pump (9) through a connecting water pipe, the water outlet of the first water supply pump (9) is connected to a horizontal interface of the second three-way joint (10) through a connecting water pipe, the other horizontal interface of the second three-way joint (10) is connected to a horizontal interface of the third three-way joint (11), the other horizontal interface of the third three-way joint (11) is connected to a horizontal interface of the fourth three-way joint (12) through a connecting water pipe, the other horizontal interface of the fourth three-way joint (12) is connected to a horizontal interface of the fifth three-way joint (13) through a connecting water pipe, the other horizontal interface of the fifth three-way joint (13) is connected to a horizontal interface of the four-way joint (14) through a connecting water pipe, and the other horizontal interface of the four-way joint (14) is connected to the water inlet of the soft water tank (4) through a connecting water pipe; The vertical interface of the first three-way joint (8) is connected to the water inlet of the second water supply pump (7) through a connecting water pipe, and the water outlet of the second water supply pump (7) is connected to the vertical interface of the second three-way joint (10) through a connecting water pipe; The vertical interface of the third three-way joint (11) is connected to the water inlet of the condenser (5) through a connecting water pipe, and the water outlet of the condenser (5) is connected to the vertical interface of the fourth three-way joint (12) through a connecting water pipe; the vertical interface of the fifth three-way joint (13) is connected to the water inlet of the economizer (6) through a connecting water pipe, and the water outlet of the economizer (6) is connected to a vertical interface of the four-way joint (14) through a connecting water pipe, and the other vertical interface of the four-way joint (14) is connected to the water inlet of the boiler drum (1) through a connecting water pipe; Shut-off valves are installed on the connecting water pipes between the first three-way joint (8) and the first water supply pump (9), between the first water supply pump (9) and the second three-way joint (10), between the first three-way joint (8) and the second water supply pump (7), between the second water supply pump (7) and the second three-way joint (10), between the third three-way joint (11) and the fourth three-way joint (12), between the third three-way joint (11) and the condenser (5), between the condenser (5) and the fourth three-way joint (12), between the fifth three-way joint (13) and the economizer (6), between the economizer (6) and the four-way joint (14), and between the fifth three-way joint (13) and the four-way joint (14); A solenoid valve is installed on the connecting water pipe between the four-way joint (14) and the soft water tank (4), and a solenoid valve and a check valve are installed on the connecting water pipe between the four-way joint (14) and the boiler drum (1); When the gas steam boiler is working normally: 1) When the water level of the boiler drum (1) is within the normal water level range, water is supplied to the boiler through the first water supply pipeline, wherein the first water supply pipeline is: closing the stop valve between the third three-way joint (11) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the four-way joint (14), and the solenoid valve between the four-way joint (14) and the soft water tank (4), and simultaneously closing the stop valve between the first three-way joint (8) and the first water supply pump (9), and between the first water supply pump (9) and the second three-way joint (10), or simultaneously closing the stop valve between the first three-way joint (8) and the second water supply pump (7), and between the second water supply pump (7) and the second three-way joint (10), and the remaining valves are opened; the water in the soft water tank (4) is pressurized by the first water supply pump (9) or the second water supply pump (7) and flows through the condenser (5) and the economizer (6) in sequence, and then enters the boiler drum (1); 2) When the water level of the boiler drum (1) exceeds the upper limit of the normal water level by at least 30 mm, the boiler feed water returns to the soft water tank (4) through the first feed water bypass. The first feed water bypass is as follows: the stop valve between the third three-way joint (11) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the four-way joint (14), and the solenoid valve between the four-way joint (14) and the boiler drum (1) are closed, and the stop valve between the first three-way joint (8) and the first feed water pump (9), and between the first feed water pump (9) and the second three-way joint (10) are closed at the same time, or the stop valve between the first three-way joint (8) and the second feed water pump (7), and between the second feed water pump (7) and the second three-way joint (10) are closed at the same time, and the other valves are opened; the water in the soft water tank (4) is pressurized by the first feed water pump (9) or the second feed water pump (7) and flows through the condenser (5) and the economizer (6) in sequence, and then returns to the soft water tank (4); When the gas steam boiler is not working properly, the condenser (5) is disconnected: 1) When the water level of the boiler drum (1) is within the normal water level range, water is supplied to the boiler through the second water supply pipeline, wherein the second water supply pipeline is as follows: the stop valve between the third three-way joint (11) and the condenser (5), the stop valve between the condenser (5) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the four-way joint (14), and the solenoid valve between the four-way joint (14) and the soft water tank (4) are closed, and the stop valve between the first three-way joint (8) and the first water supply pump (9), between the first water supply pump (9) and the second three-way joint (10) are closed at the same time, or the stop valve between the first three-way joint (8) and the second water supply pump (7), between the second water supply pump (7) and the second three-way joint (10) are closed at the same time, and the other valves are opened; the water in the soft water tank (4) is pressurized by the first water supply pump (9) or the second water supply pump (7) and flows through the economizer (6) before entering the boiler drum (1); 2) When the water level of the boiler drum (1) exceeds the upper limit of the normal water level by at least 30 mm, the boiler feed water returns to the soft water tank (4) through the second feed water bypass. The second feed water bypass is as follows: the stop valve between the third three-way joint (11) and the condenser (5), the stop valve between the condenser (5) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the four-way joint (14), and the solenoid valve between the four-way joint (14) and the boiler drum (1) are closed, and the stop valve between the first three-way joint (8) and the first feed water pump (9), between the first feed water pump (9) and the second three-way joint (10) are closed, or the stop valve between the first three-way joint (8) and the second feed water pump (7), between the second feed water pump (7) and the second three-way joint (10) are closed at the same time, and the other valves are opened; the water in the soft water tank (4) is pressurized by the first feed water pump (9) or the second feed water pump (7) and flows through the economizer (6) and then returns to the soft water tank (4); When the gas steam boiler is not operating normally, the economizer (6) is disconnected: 1) When the water level of the boiler drum (1) is within the normal water level range, water is supplied to the boiler through the third water supply pipeline, wherein the third water supply pipeline is: closing the stop valve between the third three-way joint (11) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the economizer (6), the stop valve between the economizer (6) and the four-way joint (14), and the solenoid valve between the four-way joint (14) and the soft water tank (4); and simultaneously closing the stop valve between the first three-way joint (8) and the first water supply pump (9), between the first water supply pump (9) and the second three-way joint (10), or simultaneously closing the stop valve between the first three-way joint (8) and the second water supply pump (7), between the second water supply pump (7) and the second three-way joint (10), and the remaining valves are opened; the water in the soft water tank (4) is pressurized by the first water supply pump (9) or the second water supply pump (7) and then flows through the condenser (5) and enters the boiler drum (1); 2) When the water level of the boiler drum (1) exceeds the upper limit of the normal water level by at least 30 mm, the boiler feed water returns to the soft water tank (4) through the third feed water bypass. The third feed water bypass is as follows: the stop valve between the third three-way joint (11) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the economizer (6), the stop valve between the economizer (6) and the four-way joint (14), and the solenoid valve between the four-way joint (14) and the boiler drum (1) are closed, and the stop valve between the first three-way joint (8) and the first feed water pump (9), between the first feed water pump (9) and the second three-way joint (10) or the stop valve between the first three-way joint (8) and the second feed water pump (7), between the second feed water pump (7) and the second three-way joint (10) are closed at the same time, and the other valves are opened; the water in the soft water tank (4) is pressurized by the first feed water pump (9) or the second feed water pump (7) and flows through the condenser (5) and then returns to the soft water tank (4); When the gas steam boiler is not working normally, the condenser (5) and the economizer (6) are disconnected: 1) When the water level of the boiler drum (1) is within the normal water level range, water is supplied to the boiler through the fourth water supply pipeline. The fourth water supply pipeline is as follows: the stop valve between the third three-way joint (11) and the condenser (5), the stop valve between the condenser (5) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the economizer (6), the stop valve between the economizer (6) and the four-way joint (14), and the solenoid valve between the four-way joint (14) and the soft water tank (4) are closed, and the stop valve between the first three-way joint (8) and the first water supply pump (9), between the first water supply pump (9) and the second three-way joint (10) are closed at the same time, or the stop valve between the first three-way joint (8) and the second water supply pump (7), between the second water supply pump (7) and the second three-way joint (10) are closed at the same time, and the other valves are opened; the water in the soft water tank (4) enters the boiler drum (1) after being pressurized by the first water supply pump (9) or the second water supply pump (7); 2) When the water level of the boiler drum (1) is in the high water level range and exceeds the upper limit of the normal water level by at least 30 mm, the boiler feed water returns to the soft water tank (4) through the fourth feed water bypass. The fourth feed water bypass is: closing the stop valve between the third three-way joint (11) and the condenser (5), the stop valve between the condenser (5) and the fourth three-way joint (12), the stop valve between the fifth three-way joint (13) and the economizer (6), the stop valve between the economizer (6) and the four-way joint (14), and the four-way joint (15). The solenoid valve between the first water supply pump (4) and the boiler drum (1) is closed, and the stop valves between the first three-way joint (8) and the first water supply pump (9) and between the first water supply pump (9) and the second three-way joint (10) are closed at the same time, or the stop valves between the first three-way joint (8) and the second water supply pump (7) and between the second water supply pump (7) and the second three-way joint (10) are closed at the same time, and the remaining valves are opened; the water in the soft water tank (4) is pressurized by the first water supply pump (9) or the second water supply pump (7) and then returns to the soft water tank (4).

Images