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 an ejector. 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 ejector is connected between the heat supply network water inlet valve and the water inlet of the dividing wall type heat exchanger. And an ejection opening of the ejector is connected between a water outlet of the dividing wall type heat exchanger and the heat supply network water outlet valve, 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 ejector. 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 heat network water export valve, wall type heat exchanger, heat network water import valve and ejector, heat network water export valve sets up in the outside of wall type heat exchanger water outlet, heat network water import valve sets up in the outside of wall type heat exchanger water inlet, the ejector is connected between heat network water import valve and the water inlet of wall type heat exchanger, and the injection port of ejector is connected between the water outlet of wall type heat exchanger and heat network water export valve, 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 the ejector.

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

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

[0008] Further, a controller is further included, and the controller is signal connected with the temperature sensor.

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

[0010] Further, the heat network water import valve is an electric valve, and the controller is control connected with the electric valve.

[0011] Further, a power supply is further included, and the power supply is electrically connected 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 heat network water export valve and the heat network 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 wall type heat exchanger heat exchanger after the hot water of wall type heat exchanger is drained back to the water inlet of wall type heat exchanger through the ejector, and the temperature of the heat network 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 8 is an ejector. 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", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" 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 specifically limited. In addition, the terms "mounting", "connecting", "connection" should be understood 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 shown in Figure 1 The present application provides a system for preventing condensate water from being generated 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 an ejector 8. 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 ejector 8 is connected between the heat network water inlet valve 4 and the water inlet of the partition wall type heat exchanger 2. The ejector 8 has a water inlet connected with the heat network water inlet valve 4, a water outlet connected with the water inlet of the partition wall type heat exchanger 2, and an injection port connected with the water outlet of the partition wall type heat exchanger 2. The injection port of the ejector 8 is connected between the water outlet of the partition wall type heat exchanger 2 and the heat network water outlet valve 1, so that at least part of the heated water flows back to the water inlet of the partition wall type heat exchanger 2 through the ejector 8. The ejector 8 is connected between the heat network water outlet and the water inlet connecting pipe of the partition wall type heat exchanger 2, and uses the pressure difference between the heat network water inlet and outlet pipes of the partition wall type heat exchanger 2 to provide the injection power at the water inlet of the heat network water to guide a part of the heat network water at the water outlet of the partition wall type heat exchanger 2 back to the water inlet connecting pipe of the partition wall type heat exchanger 2. The injection and mixing of water increases the temperature of the heat network water entering the partition wall type heat exchanger to above the dew point temperature of the flue gas, thereby solving the problem of condensate water.

[0023] In one aspect of the embodiment of the utility model, the water inlet of the partition wall heat exchanger 2 is provided with a temperature sensor 3. The temperature sensor 3 is used to measure the temperature of hot water mixed by the heat network water inlet pipe and the ejector 8 water outlet pipe. 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 heat exchanger according to the temperature measured by the temperature sensor 5, so as to adjust the ejector back flow, and ensure that the temperature of the heat network water entering the partition wall heat exchanger 2 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 power supply can also be used to power the electric valve, the alarm and other electrical appliances. Preferably, the power supply is a storage battery.

[0025] The partition wall 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. 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 heat exchanger 2 is overhauled, and to adjust the heat network water flow entering the partition wall 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, and 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: it 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 exchanger for heat supply network, comprising: a heat network water outlet valve (1), a heat exchanger (2), a heat network water inlet valve (4) and an ejector (8); 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 ejector (8) is connected between the heat network water inlet valve (4) and the water inlet of the heat exchanger (2), and the injection port of the ejector (8) is connected between the water outlet of the heat exchanger (2) and the heat network water outlet valve (1), so that at least part of the heat water after heat exchange flows back to the water inlet of the heat exchanger (2) through the ejector (8).

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

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 display.

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

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 controller is connected with an alarm.

6. 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.

7. 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 connected with the controller.

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 power supply is a storage battery.

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 exchanger (2) is a light pipe heat exchanger, a finned tube heat exchanger, a brazed heat exchanger or a fully welded plate heat exchanger.

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, The heat network water outlet valve (1) and the heat network water inlet valve (4) are ball valves or butterfly valves.

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