Electric heating device for guaranteeing low-nitrogen denitration of boiler

Abstract

The utility model discloses an electric heating device for guaranteeing low-nitrogen denitration of a boiler. A first condensate water tank and a second condensate water tank are respectively connected with the boiler; the control assembly comprises a first three-way pipeline, a second three-way pipeline, a first electromagnetic valve and a second electromagnetic valve. The first three-way pipeline is connected with the boiler, the first end of the first connecting pipe and the first condensate water tank. The second three-way pipeline is respectively connected with the boiler, the first end of the second connecting pipe and the second condensate water tank; the second end of the first connecting pipe and the second end of the second connecting pipe are both connected with the electric heating assembly. Condensate water in the first condensate water tank and the second condensate water tank is heated through the electric heating assembly, it is guaranteed that the temperature of the condensate water is higher than 60 DEG C, and therefore the problem that due to the fact that the temperature of the condensate water is too low, boiler nitrogen oxide emission cannot meet the requirement is solved. And the working efficiency of the electric heating device for guaranteeing the low-nitrogen denitration of the boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-nitrogen combustion of boilers, and more specifically, to an electric heating device for ensuring low-nitrogen denitrification of boilers. Background Art

[0002] In recent years, the low-nitrogen denitrification technology for gas boilers is mainly divided into two mainstream technologies: flue gas external circulation technology and flue gas condensation low-nitrogen energy-saving technology. When the condensing water temperature used in the flue gas condensation low-nitrogen energy-saving technology is higher than 60°C, the equipment can reach a stable operating state and the nitrogen oxide emissions will continue to meet <30mg / Nm 3 When the boiler is in intermittent operation, the heating process of the condensed water cannot be quickly heated due to the limitation of the boiler startup time, and the condensed water temperature drops, which causes the boiler nitrogen oxide emission concentration to exceed the standard. When the condensed water temperature does not meet the use requirements, the boiler nitrogen oxide emission does not meet the <30mg / Nm 3 requirements.

[0003] Therefore, how to provide an electric heating device for ensuring low-nitrogen denitrification of boilers has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] One purpose of the utility model is to provide a new technical solution for an electric heating device for ensuring low-nitrogen denitrification of a boiler.

[0005] According to a first aspect of the utility model, there is provided an electric heating device for ensuring low-nitrogen denitration of a boiler, comprising: a boiler, a condensing component, an electric heating component, a control component, a first connecting pipe and a second connecting pipe;

[0006] The condensation assembly comprises a first condensation water tank and a second condensation water tank, wherein the first condensation water tank and the second condensation water tank are respectively connected to the boiler;

[0007] The electric heating assembly is connected to the first condensation water tank and the second condensation water tank respectively, and is used to heat the condensation water in the first condensation water tank and the second condensation water tank;

[0008] The control component includes a first three-way pipe, a second three-way pipe, a first solenoid valve and a second solenoid valve, wherein the first three-way pipe is respectively connected to the boiler, the first end of the first connecting pipe and the first condensed water tank, and the first solenoid valve is arranged on the first connecting pipe; the second three-way pipe is respectively connected to the boiler, the first end of the second connecting pipe and the second condensed water tank, and the second solenoid valve is arranged on the second connecting pipe; the second end of the first connecting pipe and the second end of the second connecting pipe are both connected to the electric heating component

[0009] Optionally, the control component also includes a circulating pump, and the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a third connecting pipe, the water inlet end of the circulating pump is respectively connected to the first connecting pipe and the second connecting pipe, the circulating pump is arranged on the third connecting pipe, and the second end of the third connecting pipe is connected to the electric heating component.

[0010] Optionally, the control component also includes a third solenoid valve and a fourth solenoid valve, and the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a fourth connecting pipe and a fifth connecting pipe, the fourth connecting pipe is respectively connected to the first three-way pipe and the first condensate water tank, the fifth connecting pipe is respectively connected to the second three-way pipe and the second condensate water tank, and the third solenoid valve and the fourth solenoid valve are respectively arranged on the fourth connecting pipe and the fifth connecting pipe.

[0011] Optionally, the power of the electric heating component is 10 kW.

[0012] Optionally, connecting holes are respectively provided on the side walls of the first condensate water tank and the second condensate water tank, and the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a connecting pipe, both ends of the connecting pipe are respectively connected to the connecting holes, and the electric heating component is connected to the middle position of the connecting pipe.

[0013] Optionally, the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a fan, and air inlets are respectively provided on the side walls of the first condensation water tank and the second condensation water tank, and the fan introduces flue gas into the first condensation water tank and the second condensation water tank through the air inlets.

[0014] Optionally, the connecting hole is located below the air inlet.

[0015] The beneficial effects of the utility model are:

[0016] The utility model connects the electric heating component to the first condensation water tank and the second condensation water tank respectively, and connects the first three-way pipe to the boiler, the first end of the first connecting pipe and the first condensation water tank respectively, and the first solenoid valve is arranged on the first connecting pipe; the second three-way pipe is connected to the boiler, the first end of the second connecting pipe and the second condensation water tank respectively, and the second solenoid valve is arranged on the second connecting pipe; the second end of the first connecting pipe and the second end of the second connecting pipe are both connected to the electric heating component. When the boiler stops working, the condensation water in the first condensation water tank and the second condensation water tank is heated by the electric heating component to ensure that the temperature of the condensation water is higher than 60°C, thereby avoiding the problem that the boiler nitrogen oxide emission does not meet the requirements due to the condensation water temperature being too low, and effectively improving the working efficiency of the electric heating device used to ensure the low nitrogen denitration of the boiler.

[0017] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0019] Figure 1 This is a structural diagram of the electric heating device used to ensure low-nitrogen denitrification of boilers according to the utility model.

[0020] The markings in the figure are as follows: 1. Boiler; 2. Condensation component; 21. First condensation water tank; 22. Second condensation water tank; 23. Connection hole; 3. Electric heating component; 4. Control component; 41. First three-way pipe; 42. Second three-way pipe; 43. First solenoid valve; 44. Second solenoid valve; 45. Circulation pump; 46. Third solenoid valve; 47. Fourth solenoid valve; 5. First connecting pipe; 6. Second connecting pipe; 7. Third connecting pipe; 8. Fourth connecting pipe; 9. Fifth connecting pipe; 101. Connecting pipe. DETAILED DESCRIPTION

[0021] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0022] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0023] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0024] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0025] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0026] like Figure 1 As shown, an embodiment of the utility model provides an electric heating device for ensuring low-nitrogen denitrification of a boiler, comprising: a boiler 1, a condensing component 2, an electric heating component 3, a control component 4, a first connecting pipe 5 and a second connecting pipe 6.

[0027] The condensation assembly 2 includes a first condensation water tank 21 and a second condensation water tank 22, which are respectively connected to the boiler 1. The boiler 1 is used to heat the condensed water in the first condensation water tank 21 and the second condensation water tank 22 to make the water temperature of the condensed water higher than 60°C to meet the nitrogen oxide emission to continuously meet <30mg / Nm 3 requirements.

[0028] The electric heating component 3 is connected to the first condensation water tank 21 and the second condensation water tank 22 respectively, and is used to heat the condensation water in the first condensation water tank 21 and the second condensation water tank 22 .

[0029] It should be noted that when the electric heating device for ensuring low-nitrogen denitrification of the boiler of the utility model is just started, it takes a certain amount of time for the boiler 1 to heat the condensed water in the first condensed water tank 21 and the second condensed water tank 22 to 60°C. If the flue gas is treated with condensed water with a temperature less than 60°C, it is easy to cause excessive nitrogen compounds, thereby causing nitrogen oxide emissions to exceed 30 mg / Nm 3 .

[0030] Therefore, when the electric heating device for ensuring low-nitrogen denitrification of the boiler of the utility model is just started or intermittently operated, the condensed water in the first condensed water tank 21 and the second condensed water tank 22 is heated by the electric heating component 3 respectively, so that the water temperature of the condensed water in the first condensed water tank 21 and the second condensed water tank 22 is higher than 60°C, thereby meeting the use requirements of the condensed water.

[0031] When the boiler 1 is in a continuous operation state, the electric heating component 3 stops heating the condensed water in the first condensed water tank 21 and the second condensed water tank 22 .

[0032] The control component 4 includes a first three-way pipe 41, a second three-way pipe 42, a first solenoid valve 43 and a second solenoid valve 44. The first three-way pipe 41 is respectively connected to the boiler 1, the first end of the first connecting pipe 5 and the first condensate water tank 21, and the first solenoid valve 43 is arranged on the first connecting pipe 5. The first solenoid valve 43 is used to control the opening or closing of the first connecting pipe 5; the second three-way pipe 42 is respectively connected to the boiler 1, the first end of the second connecting pipe 6 and the second condensate water tank 22, and the second solenoid valve 44 is arranged on the second connecting pipe 6. The second solenoid valve 44 is used to control the opening or closing of the second connecting pipe 6; the second end of the first connecting pipe 5 and the second end of the second connecting pipe 6 are both connected to the electric heating component 3.

[0033] Specifically, when the boiler 1 is running intermittently, the first solenoid valve 43 and the second solenoid valve 44 are opened at the same time, and the electric heating component 3 is started to make the first connecting pipe 5 and the second connecting pipe 6 conductive, so that the condensed water in the first condensed water tank 21 and the second condensed water tank 22 are respectively introduced into the first connecting pipe 5 and the second connecting pipe 6, so that the condensed water is heated by the electric heating component 3, and after being heated to 60°C, it is reintroduced into the first condensed water tank 21 and the second condensed water tank 22.

[0034] When the boiler 1 is in a continuous operation state, the first solenoid valve 43 and the second solenoid valve 44 are closed at the same time, and the electric heating component 3 is turned off to stop heating the condensed water in the first condensed water tank 21 and the second condensed water tank 22 .

[0035] It should be noted that the electric heating component 3 can be a heater or other heating tools, and there is no limitation here, as long as it can heat the condensed water in the condensation component 2 to a preset temperature.

[0036] The utility model connects the electric heating assembly 3 to the first condensation water tank 21 and the second condensation water tank 22 respectively, and connects the first three-way pipe 41 to the boiler 1, the first end of the first connecting pipe 5 and the first condensation water tank 21 respectively, and the first solenoid valve 43 is arranged on the first connecting pipe 5; the second three-way pipe 42 is connected to the boiler 1, the first end of the second connecting pipe 6 and the second condensation water tank 22 respectively, and the second solenoid valve 44 is arranged on the second connecting pipe 6; the second end of the first connecting pipe 5 and the second end of the second connecting pipe 6 are both connected to the electric heating assembly 3. When the boiler 1 stops working, the condensation water in the first condensation water tank 21 and the second condensation water tank 22 is heated by the electric heating assembly 3 to ensure that the temperature of the condensation water is higher than 60°C, thereby avoiding the problem that the nitrogen oxide emission of the boiler 1 does not meet the requirements due to the low condensation water temperature, and effectively improving the working efficiency of the electric heating device for ensuring low nitrogen denitration of the boiler of the utility model.

[0037] In one embodiment of the electric heating device for ensuring low-nitrogen denitrification of the boiler of the utility model, the control component 4 also includes a circulating pump 45, and the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a third connecting pipe 7, and the water inlet end of the circulating pump 45 is respectively connected to the first connecting pipe 5 and the second connecting pipe 6, and the circulating pump 45 is arranged on the third connecting pipe 7, and the second end of the third connecting pipe 7 is connected to the electric heating component 3.

[0038] Specifically, the circulation pump 45 pumps the condensed water in the first connecting pipe 5 and the second connecting pipe 6 into the third connecting pipe 7 and introduces it into the electric heating component 3 .

[0039] The utility model connects the water inlet end of the circulation pump 45 to the first connecting pipe 5 and the second connecting pipe 6 respectively, and the circulation pump 45 is arranged on the third connecting pipe 7. The second end of the third connecting pipe 7 is connected to the electric heating component 3, thereby improving the transmission efficiency of condensed water and ensuring that the condensed water can be continuously transmitted to the electric heating component 3 for heating.

[0040] In one embodiment of the electric heating device for ensuring low-nitrogen denitrification of the boiler according to the utility model, the control component 4 also includes a third solenoid valve 46 and a fourth solenoid valve 47. The electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a fourth connecting pipe 8 and a fifth connecting pipe 9. The fourth connecting pipe 8 is respectively connected to the first three-way pipe 41 and the first condensate water tank 21, and the fifth connecting pipe 9 is respectively connected to the second three-way pipe 42 and the second condensate water tank 22. The third solenoid valve 46 and the fourth solenoid valve 47 are respectively arranged on the fourth connecting pipe 8 and the fifth connecting pipe 9. The third solenoid valve 46 is used to control the opening or closing of the fourth connecting pipe 8, and the fourth solenoid valve 47 is used to control the opening or closing of the fifth connecting pipe 9.

[0041] Specifically, when the boiler 1 is running intermittently, the first solenoid valve 43, the second solenoid valve 44, the third solenoid valve 46 and the fourth solenoid valve 47 are opened at the same time, and the electric heating component 3 is started, so that the fourth connecting pipe 8 is connected to the first connecting pipe 5, and the fifth connecting pipe 9 is connected to the second connecting pipe 6, so that the condensed water in the first condensed water tank 21 and the second condensed water tank 22 can be smoothly introduced into the electric heating component 3.

[0042] When the boiler 1 is in a continuous operation state, the first solenoid valve 43, the second solenoid valve 44, the third solenoid valve 46 and the fourth solenoid valve 47 are closed at the same time, and the electric heating component 3 is turned off to stop heating the condensed water in the first condensed water tank 21 and the second condensed water tank 22.

[0043] The utility model connects the fourth connecting pipe 8 to the first three-way pipe 41 and the first condensation water tank 21 respectively, and the fifth connecting pipe 9 to the second three-way pipe 42 and the second condensation water tank 22 respectively, and the third solenoid valve 46 and the fourth solenoid valve 47 are respectively arranged on the fourth connecting pipe 8 and the fifth connecting pipe 9, thereby avoiding the problem of condensation water flowing into the fourth connecting pipe 8 and the fifth connecting pipe 9 when the boiler 1 is in a continuous operation state, thereby reducing the total amount of condensation water and causing the condensation water temperature to deviate.

[0044] In one embodiment of the electric heating device for ensuring low-nitrogen denitrification of boilers of the utility model, the power of the electric heating component 3 is 10 kW.

[0045] In this embodiment, the volume of the first condensation water tank 21 and the second condensation water tank 22 is 0.6m 3, control the power of the electric heating component 3 to meet the needs of condensed water heat dissipation in extreme environments. After heat balance calculation, the power of the electric heating component 3 is selected to be 10kW.

[0046] In one embodiment of the electric heating device for ensuring low-nitrogen denitrification of the boiler according to the utility model, connecting holes 23 are respectively provided on the side walls of the first condensation water tank 21 and the second condensation water tank 22. The electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a connecting pipe 101, both ends of the connecting pipe 101 are respectively connected to the connecting holes 23, and the electric heating component 3 is connected to the middle position of the connecting pipe 101.

[0047] The utility model connects the two ends of the connecting pipe 101 with the connecting holes 23 respectively, and connects the electric heating component 3 with the middle position of the connecting pipe 101, so that the condensed water heated by the electric heating component 3 can be reintroduced into the first condensed water tank 21 and the second condensed water tank 22, thereby improving the transportation efficiency of the condensed water.

[0048] In one embodiment of the electric heating device for ensuring low-nitrogen denitrification of the boiler according to the utility model, the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a fan (not shown in the figure), and air inlets (not shown in the figure) are respectively provided on the side walls of the first condensation water tank 21 and the second condensation water tank 22, and the fan introduces flue gas into the first condensation water tank 21 and the second condensation water tank 22 through the air inlets.

[0049] The utility model provides air inlets on the side walls of the first condensation water tank 21 and the second condensation water tank 22 respectively, and the fan introduces the flue gas into the first condensation water tank 21 and the second condensation water tank 22 through the air inlets, so that the condensed water treats the flue gas, so that the nitrogen oxide emission continues to meet the requirement of <30mg / Nm 3 requirements.

[0050] In one embodiment of the electric heating device for ensuring low-nitrogen denitrification of boilers according to the utility model, the connecting hole 23 is located below the air inlet. This arrangement avoids overflow of the first condensation water tank 21 and the second condensation water tank 22 due to heating and boiling, and at the same time avoids interference of the fan with the flow direction of the condensed water.

[0051] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An electric heating device for ensuring low nitrogen denitration of boilers, characterized in that: include: A boiler, a condensing component, an electric heating component, a control component, a first connecting pipe and a second connecting pipe; The condensation assembly comprises a first condensation water tank and a second condensation water tank, wherein the first condensation water tank and the second condensation water tank are respectively connected to the boiler; The electric heating assembly is connected to the first condensation water tank and the second condensation water tank respectively, and is used to heat the condensation water in the first condensation water tank and the second condensation water tank; The control component includes a first three-way pipe, a second three-way pipe, a first solenoid valve and a second solenoid valve. The first three-way pipe is respectively connected to the boiler, the first end of the first connecting pipe and the first condensate water tank, and the first solenoid valve is arranged on the first connecting pipe; the second three-way pipe is respectively connected to the boiler, the first end of the second connecting pipe and the second condensate water tank, and the second solenoid valve is arranged on the second connecting pipe; the second end of the first connecting pipe and the second end of the second connecting pipe are both connected to the electric heating component.

2. The electric heating device for ensuring low-nitrogen denitrification of boilers according to claim 1 is characterized in that: The control component also includes a circulating pump, and the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a third connecting pipe. The water inlet end of the circulating pump is respectively connected to the first connecting pipe and the second connecting pipe. The circulating pump is arranged on the third connecting pipe, and the second end of the third connecting pipe is connected to the electric heating component.

3. The electric heating device for ensuring low nitrogen denitrification of boiler according to claim 1 is characterized in that: The control component also includes a third solenoid valve and a fourth solenoid valve, and the electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a fourth connecting pipe and a fifth connecting pipe, the fourth connecting pipe is respectively connected to the first three-way pipe and the first condensate water tank, the fifth connecting pipe is respectively connected to the second three-way pipe and the second condensate water tank, and the third solenoid valve and the fourth solenoid valve are respectively arranged on the fourth connecting pipe and the fifth connecting pipe.

4. The electric heating device for ensuring low-nitrogen denitrification of boilers according to claim 1 is characterized in that: The power of the electric heating component is 10 kW.

5. The electric heating device for ensuring low-nitrogen denitrification of boilers according to claim 1 is characterized in that: Connecting holes are respectively arranged on the side walls of the first condensation water tank and the second condensation water tank. The electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a connecting pipe, both ends of the connecting pipe are respectively connected to the connecting holes, and the electric heating component is connected to the middle position of the connecting pipe.

6. The electric heating device for ensuring low-nitrogen denitrification of boilers according to claim 5 is characterized in that: The electric heating device for ensuring low-nitrogen denitrification of the boiler also includes a fan. Air inlets are respectively provided on the side walls of the first condensation water tank and the second condensation water tank. The fan introduces flue gas into the first condensation water tank and the second condensation water tank through the air inlets.

7. The electric heating device for ensuring low-nitrogen denitrification of boilers according to claim 6 is characterized in that: The connecting hole is located below the air inlet.

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