System for preventing dividing wall type flue gas heat exchanger from generating condensate water

Abstract

The utility model provides a system for preventing a dividing wall type flue gas heat exchanger from generating condensate water. The system comprises a heat supply network water outlet valve, a dividing wall type heat exchanger, a heat supply network water inlet valve and a water mixing pipe. The heat supply network water outlet valve is arranged on the outer side of a water outlet of the dividing wall type heat exchanger, the heat supply network water inlet valve is arranged on the outer side of a water inlet of the dividing wall type heat exchanger, and the water mixing pipe is connected between the heat supply network water inlet valve and the water inlet of the dividing wall type heat exchanger. A drainage port of the water mixing pipe is connected between a water outlet of the dividing wall type heat exchanger and the heat supply network water outlet valve, and the height of the water mixing pipe is higher than that of the dividing wall type heat exchanger, so that at least one part of hot water subjected to heat exchange flows back to a water inlet of the dividing wall type heat exchanger through the water mixing pipe. The temperature of heat supply network water entering the dividing wall type heat exchanger is increased in a water mixing mode, the temperature of the water inlet can be increased to be above the dew point temperature of smoke, and the problem of condensate water is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of partition wall type flue gas heat exchanger, especially to a system for preventing condensate water from being produced in the partition wall type flue gas heat exchanger. BACKGROUND

[0002] At present, many natural gas boilers for heating are equipped with partition wall type flue gas heat exchangers at the flue gas outlet, in which the flue gas at the outlet of the boiler is directly exchanged with the low-temperature heat network return water, so as to fully utilize the heat of the flue gas at a relatively high temperature and improve the energy utilization rate. The structural forms mainly include the tube fin type, the fully welded plate type, the brazing type, etc. The flue gas and the hot water flow in opposite directions, and the flue gas at about 200 DEG C can be reduced to below 100 DEG C. There is a large amount of water vapor in the flue gas produced by the combustion of natural gas, and the volume fraction is about 17%, and the dew point temperature is about 57 DEG C to 58 DEG C. When the inlet temperature of the hot water is lower than the dew point temperature, condensate water will inevitably be produced in the local position. The harm is that, since there are nitrogen oxides and carbon dioxide in the flue gas, the condensate water is acidic, the PH value is about 3 to 4, and the partition wall type heat exchanger will be corroded, thereby affecting the service life of the partition wall type heat exchanger. In addition, the gap between the plates of the partition wall type heat exchanger with the brazing or fully welded structure is small, and when the condensate water is produced, the resistance on the flue gas side will be greatly increased, which will affect the output of the burner, and even the explosion-proof door will be opened.

[0003] In order to solve the corrosion problem of the condensate water of the partition wall type flue gas heat exchanger on the heat exchanger, the current conventional method is to use corrosion-resistant materials such as stainless steel and ND steel, and to set a condensate water discharge pipe at the bottom of the heat exchanger, so as to discharge the condensate water in time, or to reduce the flow of the hot water and increase the outlet temperature of the flue gas. However, even if these measures are taken, since the hot water and the flue gas are exchanged in opposite directions, when the temperature of the hot water is lower than the dew point temperature in the flue gas, condensate water will inevitably be produced on the heat exchange surface at the local position of the hot water inlet. The gap formed by the weld of the heat exchange surface at the position where the condensate water is produced will cause electrochemical corrosion, and the heat exchange surface will be corroded from the outside to the inside, thereby affecting the safe and stable operation of the equipment and the service life. Therefore, how to avoid the occurrence of condensate water in the partition wall type flue gas heat exchanger has become a technical problem to be solved in the field. UTILITY MODEL CONTENTS

[0004] The utility model discloses to the deficiency of prior art, the utility model provides a system for preventing condensate water from being produced in the partition wall type flue gas heat exchanger.

[0005] The utility model provides a system for preventing condensate water from being produced by the wall type flue gas heat exchanger, including hot net water export valve, wall type heat exchanger, hot net water import valve and mixed water pipe, hot net water export valve sets up in the outside of wall type heat exchanger water outlet, hot net water import valve sets up in the outside of wall type heat exchanger water inlet, mixed water pipe is connected between hot net water import valve and wall type heat exchanger's water inlet, and the drainage of mixed water pipe is connected between wall type heat exchanger water outlet and hot net water export valve, wherein, the height that mixed water pipe sets is higher than the height of wall type heat exchanger, so that at least a part of the hot water after heat exchange is backflowed to the water inlet of wall type heat exchanger through mixed water pipe.

[0006] Further, a temperature sensor is installed on the water inlet of the wall type heat exchanger.

[0007] Further, the temperature sensor is connected with a display.

[0008] Further, a controller is further included, which is in signal connection with the temperature sensor.

[0009] Further, the controller is connected with an alarm.

[0010] Further, the hot net water import valve is an electric valve, and the controller is in control connection with the electric valve.

[0011] Further, a power supply is further included, which is in electrical connection with the controller.

[0012] Further, the power supply is a storage battery.

[0013] Further, the wall type heat exchanger is a light pipe heat exchanger, a finned tube heat exchanger, a brazed heat exchanger or a fully welded plate heat exchanger.

[0014] Further, the hot net water export valve and the hot net water import valve are ball valves or butterfly valves.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model discloses a mixed water pipe to drain the hot water after heat exchange of the wall type heat exchanger back to the water inlet of the wall type heat exchanger, so that the temperature of the hot net water entering the wall type heat exchanger is improved in the mixed water mode, the temperature of the water inlet of the wall type heat exchanger can be improved to above the dew point temperature of flue gas, so that the production of condensate water is effectively avoided, and the problem of condensate water is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Figure 1 The structure diagram of the system for preventing the partition wall type flue gas heat exchanger from generating condensate water is shown.

[0018] In the drawings, 1 is a heat network water outlet valve, 2 is a partition wall type heat exchanger, 3 is a temperature sensor, 4 is a heat network water inlet valve, and 9 is a mixed water pipe. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0021] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly specified. In addition, the terms "mounting", "connecting", "connection" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] As Figure 1 The utility model discloses a system for preventing condensate water from being produced in a partition wall type flue gas heat exchanger, which comprises a heat network water outlet valve 1, a partition wall type heat exchanger 2, a heat network water inlet valve 4 and a mixing water pipe 9. The heat network water outlet valve 1 is arranged outside the water outlet of the partition wall type heat exchanger 2, the heat network water inlet valve 4 is arranged outside the water inlet of the partition wall type heat exchanger 2, and the mixing water pipe 9 is connected between the heat network water inlet valve 4 and the water inlet of the partition wall type heat exchanger 2. The mixing water pipe 9 has a water inlet connected to the heat network water inlet valve 4, a water outlet connected to the water inlet of the partition wall type heat exchanger 2, and a drainage port connected to the water outlet of the partition wall type heat exchanger 2. The drainage port of the mixing water pipe 9 is connected between the water outlet of the partition wall type heat exchanger 2 and the heat network water outlet valve 1. The height of the mixing water pipe 9 is higher than the height of the partition wall type heat exchanger 2, and the height difference H depends on the resistance of the heat network water side of the partition wall type heat exchanger 2. The temperature of the heat network water inlet pipe of the partition wall type heat exchanger 2 is low, and the density of the water is large. The temperature of the outlet pipe of the partition wall type heat exchanger 2 is high, and the density of the water is small. Therefore, the density difference between the mixing water pipe 9 and the outlet pipe of the partition wall type heat exchanger 2 forms a natural circulation power. The circulation power can guide a part of the heat network water from the outlet of the partition wall type heat exchanger 2 back to the mixing water pipe 9, and mix the water from the heat network water inlet in the mixing water pipe 9, thereby increasing the temperature of the heat network water entering the partition wall type heat exchanger. When the temperature is higher than the dew point temperature of the flue gas, the problem of condensate water can be solved.

[0023] In one aspect of the embodiment of the utility model, the water inlet of the partition wall type heat exchanger 2 is provided with a temperature sensor 3. The temperature sensor 3 is used for measuring the temperature of hot water mixed by the heat network water inlet pipe and the water outlet pipe of the mixing water pipe 9. Preferably, the temperature sensor 3 is connected with a display for displaying the real-time water temperature. Preferably, the utility model further comprises a controller, the controller is signal connected with the temperature sensor 3 for receiving the water temperature signal. When the water temperature is lower than the dew point of flue gas, the alarm connected with the controller will give an alarm prompt. Further preferably, the heat network water inlet valve 4 is an electric valve, and the controller is control connected with the electric valve. The controller adjusts the opening of the heat network water inlet valve 4 of the partition wall type heat exchanger according to the temperature measured by the temperature sensor 5, so as to adjust the pressure and flow of the heat network water entering the mixing water pipe 9, and ensure that the temperature of the heat network water entering the partition wall type heat exchanger 2 after mixing in the mixing water pipe 9 is higher than the dew point temperature of flue gas.

[0024] At the same time, in order to ensure the power supply, the utility model further comprises a power supply, and the power supply is electrically connected with the controller. The electric valve 4, the alarm and other electrical appliances can also be powered, and preferably, the power supply is a storage battery.

[0025] The partition wall type heat exchanger 2 is a light pipe type heat exchanger, a finned tube type heat exchanger, a brazed type heat exchanger or a fully welded plate type heat exchanger. The heat network water outlet valve 1 and the heat network water inlet valve 4 are ball valves or butterfly valves. The functions are to shut off when the partition wall type heat exchanger 2 is overhauled, and to adjust the flow of the heat network water entering the partition wall type heat exchanger 2.

[0026] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A system for preventing the generation of condensate in a wall-type flue gas heat exchanger, characterized in that, The utility model relates to a heat exchange device for heat supply network, which comprises a heat network water outlet valve (1), a heat exchanger (2), a heat network water inlet valve (4) and a mixing pipe (9). The heat network water outlet valve (1) is arranged outside the water outlet of the heat exchanger (2), the heat network water inlet valve (4) is arranged outside the water inlet of the heat exchanger (2), the mixing pipe (9) is connected between the heat network water inlet valve (4) and the water inlet of the heat exchanger (2), and the drainage opening of the mixing pipe (9) is connected between the water outlet of the heat exchanger (2) and the heat network water outlet valve (1), wherein the height of the mixing pipe (9) is higher than the height of the heat exchanger (2), so that at least part of the heated water flows back to the water inlet of the heat exchanger (2) through the mixing pipe (9). A temperature sensor (3) is arranged on the water inlet of the heat exchanger (2).

2. The system for preventing the generation of condensate water in a regenerative flue gas heat exchanger according to claim 1, characterized in that, The temperature sensor (3) is connected with a display.

3. The system for preventing the generation of condensate water in a regenerative flue gas heat exchanger according to claim 2, characterized in that, The temperature sensor (3) is connected with a controller.

4. The system for preventing the generation of condensate water in a regenerative flue gas heat exchanger according to claim 2, characterized in that, The controller is connected with an alarm.

5. The system for preventing the generation of condensate water in a regenerative flue gas heat exchanger according to claim 4, characterized in that, The heat network water inlet valve (4) is an electric valve, and the controller is connected with the electric valve.

6. The system for preventing the generation of condensate water in a regenerative flue gas heat exchanger according to claim 4, characterized in that, A power supply is further arranged, and the power supply is connected with the controller.

7. The system for preventing the generation of condensate water in a regenerative flue gas heat exchanger according to claim 4, characterized in that, The power supply is a storage battery.

8. The system for preventing the generation of condensate water in a wall-type flue gas heat exchanger according to claim 7, characterized in that, The heat exchanger (2) is a light pipe heat exchanger, a finned tube heat exchanger, a brazed heat exchanger or a fully welded plate heat exchanger.

9. The system for preventing the generation of condensate water in a regenerative flue gas heat exchanger according to claim 1, characterized in that, The heat network water outlet valve (1) and the heat network water inlet valve (4) are ball valves or butterfly valves.

10. The system for preventing the generation of condensate water in a wall-type flue gas heat exchanger according to any one of claims 1 to 9, characterized in that, ​

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