Flue gas circulating system for incinerator

Abstract

A flue gas circulation system for an incinerator comprises a primary air fan, a secondary air fan, a secondary air fan, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe and a gas outlet pipe, and the air inlet end of the primary air fan is communicated with the outside to convey primary air to the primary air fan; the primary air preheater is communicated with the air outlet end of the primary fan so as to heat the conveyed primary air; the air inlet end of the flue gas circulating fan is communicated with the end, far away from the primary fan, of the primary air preheater, and the air outlet end of the flue gas circulating fan is communicated with the outside; and the electric control valve is arranged between the primary air preheater and the flue gas circulating fan so as to control the air volume of primary air. The structure is simple, the air door baffle and the pipeline are prevented from being corroded in the aspect of safety performance, and electricity for production can be effectively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of power plants, in particular to a flue gas circulation system for an incinerator. Background Art

[0002] In the related technology, most flue gas recirculation systems are designed with a sealed air system, which consists of a blower, an electric heater, a damper and a pipeline. The main functions are: 1. When the flue gas recirculation fan stops operating, the main and bypass dampers are not tight enough, and the flue gas in the furnace flows back to the outlet of the induced draft fan and is discharged to the chimney, resulting in abnormal flue gas data. After the high-pressure sealed air is introduced, it can be ensured that the flue gas does not flow back. 2. When the incinerator load is low, the low-frequency operation of the flue gas recirculation fan will cause the flue gas flow rate to be slow and produce condensed water. The hot air introduced into the recirculation pipeline can ensure the temperature in the pipe is stable, and the slow flue gas flow rate will not cause the temperature drop to produce condensed water to corrode the pipeline.

[0003] Therefore, existing sealed air systems all have problems such as high power consumption and high failure rate of electric heaters, making it difficult to ensure the normal operation of the flue gas recirculation system. Summary of the invention

[0004] The utility model aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the utility model proposes a flue gas circulation system for an incinerator, which has a simple structure and can not only avoid corrosion of the damper baffle and the pipeline in terms of safety performance, but also effectively save production electricity.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A flue gas circulation system for an incinerator, comprising:

[0007] A primary fan, wherein the air inlet end of the primary fan is connected to the outside and the primary air is transported from the primary fan;

[0008] A primary air preheater, the primary air preheater is connected to the air outlet of the primary fan to heat the delivered primary air;

[0009] a flue gas circulation fan, wherein an air inlet end of the flue gas circulation fan is connected to the primary air preheater at an end away from the primary air fan, and an air outlet end of the flue gas circulation fan is connected to the outside;

[0010] An electric regulating valve is arranged between the primary air preheater and the flue gas circulation fan to adjust the air volume.

[0011] In some embodiments, a connecting pipe is further included, through one end of which the primary air preheater is connected to the flue gas circulation fan.

[0012] In some embodiments, the wind pressure at the air outlet of the primary fan is 10 kPa.

[0013] In some embodiments, the temperature of the primary air at the air outlet of the primary air preheater is 200°C.

[0014] In some embodiments, a bypass air path is further included, and the air inlet end of the flue gas circulation fan is respectively connected to an end of the primary air preheater away from the primary fan and one end of the bypass air path, and the other end of the bypass air path is connected to the outside.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects:

[0016] 1. The utility model is used for the flue gas circulation system of the incinerator, which has a simple structure, not only avoiding the corrosion of the damper baffle and the pipeline in terms of safety performance, but also effectively saving production electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the flue gas circulation system in the embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in combination with the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of the technical solution for which protection is sought in the present invention.

[0021] Example:

[0022] like Figure 1As shown, this embodiment provides a flue gas circulation system for an incinerator, comprising:

[0023] A primary fan 1, the air inlet end of the primary fan 1 is connected to the outside to transport primary air from the primary fan 1;

[0024] A primary air preheater 2, the primary air preheater 2 is connected to the air outlet of the primary fan 1 to heat the delivered primary air;

[0025] A flue gas circulation fan 3, wherein an air inlet end of the flue gas circulation fan 3 is connected to the primary air preheater 2 at an end away from the primary fan 1, and an air outlet end of the flue gas circulation fan 3 is connected to the outside;

[0026] The electric regulating valve 4 is arranged between the primary air preheater 2 and the flue gas circulation fan 3 to control the air volume of the primary air.

[0027] In this embodiment, the structure is simple, which not only avoids corrosion of the damper baffle and the pipeline in terms of safety performance, but also effectively saves production electricity.

[0028] In this embodiment, the existing sealed fan system is first eliminated, and then the air inlet end of the flue gas circulation fan 3 is connected with the primary air preheater 2 at the end away from the primary fan 1, so that the primary fan 1, the primary air preheater 2, the electric regulating valve 4, and the flue gas circulation machine are connected in sequence, and the air volume of the primary air is controlled by the electric regulating valve 4, so that sufficient sealed air can be provided at any time. In this way, the stable operation of the flue gas recirculation pipeline system can be guaranteed through the coordinated action of stable primary air temperature and air pressure, thereby avoiding the abnormal environmental protection data caused by the backflow of flue gas in the furnace to the chimney due to the failure of the sealed air system, and at the same time, the constant air temperature of the flue gas recirculation pipeline can be guaranteed to avoid condensation water caused by temperature drop.

[0029] Furthermore, it also includes a connecting pipe 5, through which the primary air preheater 2 is connected to the flue gas circulation fan 3.

[0030] Preferably, the wind pressure at the air outlet of the primary fan 1 is 10 kPa.

[0031] Specifically, the temperature of the primary air at the air outlet of the primary air preheater 2 is 200°C.

[0032] In particular, a bypass air path is also included, and the air inlet end of the flue gas circulation fan 3 is respectively connected to the end of the primary air preheater 2 away from the primary fan 1 and one end of the bypass air path, and the other end of the bypass air path is connected to the outside.

[0033] In this embodiment, the wind pressure at the outlet of the primary fan 1 is 10kPa. Since the wind pressure of the flue gas in the circulating air duct in the shutdown state is 1kPa, the wind pressure at the outlet of the primary fan 1 is higher than the wind pressure in the flue gas recirculation air duct in the shutdown state. In addition, since the recirculation air temperature is 150℃ and the primary air preheater outlet air temperature is 200℃, the primary air preheater outlet air temperature is higher than the recirculation air temperature, thereby preventing condensation on the damper and pipeline and corroding the pipeline.

[0034] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A flue gas circulation system for an incinerator, characterized in that: include: A primary fan (1), wherein an air inlet end of the primary fan (1) is connected to the outside to transport primary air from the primary fan (1); A primary air preheater (2), the primary air preheater (2) being connected to the air outlet end of the primary air fan (1) to heat the delivered primary air; A flue gas circulation fan (3), wherein an air inlet end of the flue gas circulation fan (3) is connected to the primary air preheater (2) at an end away from the primary fan (1), and an air outlet end of the flue gas circulation fan (3) is connected to the outside; An electric regulating valve (4), wherein the electric regulating valve (4) is arranged between the primary air preheater (2) and the flue gas circulation fan (3) to control the air volume of the primary air.

2. A flue gas circulation system for an incinerator according to claim 1, characterized in that: It also comprises a connecting pipe (5), through which the primary air preheater (2) is connected to the flue gas circulation fan (3).

3. A flue gas circulation system for an incinerator according to claim 1, characterized in that: The wind pressure at the air outlet end of the primary fan (1) is 10 kPa.

4. A flue gas circulation system for an incinerator according to claim 1, characterized in that: The temperature of the primary air at the air outlet of the primary air preheater (2) is 200°C.

5. The flue gas circulation system for an incinerator according to claim 1, characterized in that: It also includes a bypass air path, wherein the air inlet end of the flue gas circulation fan (3) is respectively connected to an end of the primary air preheater (2) away from the primary fan (1) and one end of the bypass air path, and the other end of the bypass air path is connected to the outside.

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