Operation control system and method for flue gas waste heat

Abstract

The invention relates to the technical field of flue gas waste heat utilization, in particular to a flue gas waste heat operation control system and method.The flue gas waste heat operation control system comprises a first fan assembly, a second fan assembly, a third fan assembly and a fourth fan assembly, and the second fan assembly comprises a right first air heater and a right second air heater. The first fan assembly and the second fan assembly are arranged in parallel to increase the adjusting space of the whole system, and meanwhile, the controllers are arranged to cope with flue gas at different load states and different temperatures, so that the flue gas can reach the emission standard temperature all the time.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas waste heat utilization, and particularly to an operation control system and method for flue gas waste heat. Background Art

[0002] A flue gas waste heat utilization system is a heat exchange system that recovers and utilizes the waste heat of the flue gas at the outlet of the air preheater, including a low-temperature economizer, a warm air heater, a heat medium water circulation pump, etc. The low-temperature economizer uses low-temperature condensate to absorb the waste heat of the flue gas, and the heated condensate after heat absorption is transported to the hot air of the warm air heater.

[0003] The traditional flue gas waste heat utilization system has only one operation mode, which uses a low-temperature economizer to absorb the waste heat of the flue gas to heat the condensate, and there are problems such as a small adjustment space, a relatively high flue gas temperature at the outlet of the low economizer under high load, and a relatively low flue gas temperature at the outlet of the low economizer under low load. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: An operation control system for flue gas waste heat, including,

[0006] A first fan assembly, including a left first warm air heater and a left second warm air heater; and,

[0007] A second fan assembly, including a right first warm air heater and a right second warm air heater.

[0008] As a preferred embodiment of the operation control system for flue gas waste heat of the present invention, wherein: an A1 controller is provided on the inner wall of the left first warm air heater, and an A2 controller is provided below the A1 controller on the inner wall of the left first warm air heater.

[0009] As a preferred embodiment of the operation control system for flue gas waste heat of the present invention, wherein: an A3 controller is provided on the inner wall of the left second warm air heater, and an A4 controller is further provided below the A3 controller on the inner wall of the left second warm air heater.

[0010] As a preferred embodiment of the operation control system for flue gas waste heat of the present invention, wherein: an A5 controller is further provided below the A4 controller on the inner wall of the left second warm air heater.

[0011] As a preferred embodiment of the operation control system for flue gas waste heat of the present invention, wherein: an A6 controller is further provided below the A5 controller on the inner wall of the left second warm air heater.

[0012] As a preferred embodiment of the operation control system for the waste heat of flue gas of the present invention, the following is provided: A B1 controller is provided on the inner wall of the right first air preheater, and a B2 controller is provided below the B1 controller on the inner wall of the right first air preheater.

[0013] As a preferred embodiment of the operation control system for the waste heat of flue gas of the present invention, the following is provided: A B3 controller is provided on the inner wall of the right second air preheater, and a B4 controller is provided below the B3 controller on the inner wall of the right second air preheater.

[0014] As a preferred embodiment of the operation control system for the waste heat of flue gas of the present invention, the following is provided: A B5 controller is provided below the B4 controller on the inner wall of the right second air preheater.

[0015] As a preferred embodiment of the operation control system for the waste heat of flue gas of the present invention, the following is provided: A B6 controller is provided below the B5 controller on the inner wall of the right second air preheater.

[0016] Advantages of the present invention: By providing the first fan assembly and the second fan assembly and arranging them in parallel, the adjustment space of the overall system is increased. At the same time, by providing each controller, flue gas at different temperatures under different load conditions can be dealt with, so that the flue gas can always reach the emission standard temperature.

[0017] To solve the above technical problems, the present invention also provides the following technical solution: An operation control method for the waste heat of flue gas, including,

[0018] The flue gas passes through the left first air preheater and the left second air preheater respectively. The left first air preheater and the left second air preheater absorb the heat of the flue gas and transfer the heat to the right first air preheater and the right second air preheater respectively;

[0019] The right first air preheater and the right second air preheater absorb the heat and transfer the heat to the air passing through the right first air preheater and the right second air preheater to increase the air temperature.

[0020] Advantages of the present invention: By the cooperation of the left first air preheater, the left second air preheater, the right first air preheater and the right second air preheater, the temperatures of the flue gas and the fresh air are adjusted, so that the two can enter the designated machine at the standard temperature to improve the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1This is the overall structure schematic diagram of the present invention.

[0023] Figure 2 This is the structure schematic diagram of the first fan assembly in the present invention.

[0024] Figure 3 This is the structure schematic diagram of the second fan assembly in the present invention. Detailed implementation manners

[0025] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings of the specification.

[0026] In the following description, many specific details are set forth to facilitate a thorough understanding of the present invention. However, the present invention may be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0028] Embodiment 1

[0029] Refer to Figures 1 to 3 , which is the first embodiment of the present invention. This embodiment provides an operating control system for flue gas waste heat.

[0030] The first fan assembly 100 includes a left first air preheater 101 and a left second air preheater 102. Among them, both the left first air preheater 101 and the left second air preheater 102 are connected to a forced draft fan. The forced draft fan is mainly used to convey flue gas into the left first air preheater 101 and the left second air preheater 102. At the same time, corresponding pipes are also provided in the left first air preheater 101 and the left second air preheater 102. When the flue gas passes through these pipes, the condensed water in the pipes will absorb the heat of the flue gas to reduce the temperature of the flue gas, facilitating subsequent treatment of the flue gas.

[0031] The second fan assembly 200 includes a right first warm air heater 201 and a right second warm air heater 202. Among them, the right first warm air heater 201 and the right second warm air heater 202 are also respectively connected with a blower, and this blower will transport air into the right first warm air heater 201 and the right second warm air heater 202 to form fresh air. At the same time, pipes are also arranged in the right first warm air heater 201 and the right second warm air heater 202, and these pipes are connected to the above-mentioned pipes. However, after the condensed water in the above-mentioned pipes absorbs enough heat, it will move into the pipes of the right first warm air heater 201 and the right second warm air heater 202. In this way, when the fresh air passes through the right first warm air heater 201 and the right second warm air heater 202, it will be heated by the hot water in the pipes. In this way, when the air enters the boiler, it will not reduce the temperature of the boiler, thereby improving the working efficiency of the boiler. At the same time, the first fan assembly 100 is arranged in parallel with the second fan assembly 200, which improves the adjustment space of the overall system.

[0032] Embodiment 2

[0033] Refer to Figures 1 to 3 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment. The difference is that it solves the problems of higher flue gas temperature at high load and lower flue gas temperature at low load.

[0034] An A1 controller 103 is arranged on the inner wall of the left first warm air heater 101, and an A2 controller 104 is arranged below the A1 controller 103 on the inner wall of the left first warm air heater 101. An A3 controller 105 is arranged on the inner wall of the left second warm air heater 102, and an A4 controller 106 is further arranged below the A3 controller 105 on the inner wall of the left second warm air heater 102. An A5 controller 107 is further arranged below the A4 controller 106 on the inner wall of the left second warm air heater 102. An A6 controller 108 is further arranged below the A5 controller 107 on the inner wall of the left second warm air heater 102. Among them, when the flue gas passes through the left first warm air heater 101 and the left second warm air heater 102, a detection element will detect the temperature of the flue gas. At this time, at high load, the flue gas temperature will be very high. When the A1 controller 103 and the A2 controller 104 detect the high temperature, they will transmit the data to the computer. At this time, the computer will divide the A3 controller 105, the A4 controller 106, the A5 controller 107, and the A6 controller 108 into a high-temperature section and a low-temperature section respectively. At this time, the A3 controller 105 and the A4 controller 106 in the high-temperature section will not start and will be in a cut-off state for the time being. The A5 controller 107 and the A6 controller 108 will control the water temperature in the water pipes of the left first warm air heater 101 and the left second warm air heater 102. At this time, the A5 controller 107 and the A6 controller 108 will transmit the data to the water source delivery device to reduce the water temperature of the return condensate, and absorb the temperature of the flue gas through the relatively low-temperature return condensate, thereby reducing the temperature of the discharged flue gas;

[0035] Under low load conditions, when the flue gas temperature fails to reach the emission standard, the computer will cut off the A5 controller 107 and the A6 controller 108, and transmit data to the water source delivery device through the A3 controller 105 and the A4 controller 106 to increase the water temperature of the returned condensate water it delivers. At this time, the flue gas can be heated, so that the flue gas temperature reaches the emission standard.

[0036] The inner wall of the right first air preheater 201 is provided with a B1 controller 203. Below the B1 controller 203 on the inner wall of the right first air preheater 201, a B2 controller 204 is provided. The inner wall of the right second air preheater 202 is provided with a B3 controller 205. Below the B3 controller 205 on the inner wall of the right second air preheater 202, a B4 controller 206 is provided. Below the B4 controller 206 on the inner wall of the right second air preheater 202, a B5 controller 207 is provided. Below the B5 controller 207 on the inner wall of the right second air preheater 202, a B6 controller 208 is provided. Correspondingly, when the A3 controller 105 and the A4 controller 106 are cut off, the B3 controller 205 and the B4 controller 206 will also be cut off. At this time, the returned condensate water after being heated by the flue gas is allowed by the B5 controller 207 and the B6 controller 208 to enter the right first air preheater 201 and the right second air preheater 202. At this time, when the forced draft fan delivers fresh air to the right first air preheater 201 and the right second air preheater 202, the fresh air can be heated.

[0037] When the A5 controller 107 and the A6 controller 108 are cut off, the B3 controller 205 and the B4 controller 206 will allow the water source delivery device to directly deliver the relatively high-temperature returned condensate water to the right first air preheater 201 and the right second air preheater 202 to heat the fresh air.

[0038] Embodiment 3

[0039] Refer to Figures 1 to 3 , which is the third embodiment of the present invention. This embodiment provides an operating control system method for the waste heat of flue gas.

[0040] Specifically, the flue gas passes through the left first air preheater and the left second air preheater respectively. The left first air preheater and the left second air preheater absorb the heat of the flue gas and transfer the heat to the right first air preheater and the right second air preheater respectively.

[0041] The right first air preheater and the right second air preheater absorb the heat and transfer the heat to the air passing through the right first air preheater and the right second air preheater to increase the air temperature.

[0042] Among them, each air heater is connected with a corresponding valve. When it is necessary to cut off the high-temperature section or the low-temperature section, the corresponding valve will close to control the corresponding water flow into different air heaters.

[0043] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (e.g., changes in the dimensions, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, colors, orientations, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number or position of discrete elements may be altered or changed. Accordingly, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures that perform the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0044] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently contemplated best mode of carrying out the present invention or those that are not relevant to the implementation of the present invention).

[0045] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without undue experimentation, such development efforts will be a routine task of design, manufacturing and production.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A flue gas waste heat operation control system, characterized in that: include, The first fan assembly (100) comprises a left first air heater (101) and a left second air heater (102); and The second fan assembly (200) includes a right first air heater (201) and a right second air heater (202).

2. The operation control system of flue gas waste heat according to claim 1, characterized in that: An A1 controller (103) is arranged on the inner wall of the left first air heater (101), and an A2 controller (104) is arranged on the inner wall of the left first air heater (101) below the A1 controller (103).

3. The operation control system of flue gas waste heat according to claim 2, characterized in that: An A3 controller (105) is arranged on the inner wall of the left second air heater (102), and an A4 controller (106) is also arranged on the inner wall of the left second air heater (102) below the A3 controller (105).

4. The operation control system of flue gas waste heat according to claim 3, characterized in that: An A5 controller (107) is also provided on the inner wall of the left second air heater (102) below the A4 controller (106).

5. The operation control system of flue gas waste heat according to claim 4, characterized in that: An A6 controller (108) is also provided on the inner wall of the left second air heater (102) below the A5 controller (107).

6. The operation control system of flue gas waste heat according to claim 5, characterized in that: A B1 controller (203) is arranged on the inner wall of the right first air heater (201), and a B2 controller (204) is arranged on the inner wall of the right first air heater (201) below the B1 controller (203).

7. The operation control system of flue gas waste heat according to claim 6, characterized in that: A B3 controller (205) is arranged on the inner wall of the right second air heater (202), and a B4 controller (206) is arranged on the inner wall of the right second air heater (202) below the B3 controller (205).

8. The operation control system of flue gas waste heat according to claim 7, characterized in that: A B5 controller (207) is provided on the inner wall of the right second air heater (202) below the B4 controller (206).

9. The operation control system of flue gas waste heat according to claim 8, characterized in that: A B6 controller (208) is provided on the inner wall of the right second air heater (202) below the B5 controller (207).

10. A flue gas waste heat operation control method, characterized in that: The device comprises an operation control system for waste heat of flue gas as claimed in any one of claims 1 to 9, and The flue gas passes through the first left air heater and the second left air heater respectively, the first left air heater and the second left air heater absorb the heat of the flue gas and transfer the heat to the first right air heater and the second right air heater respectively; The right first air heater and the right second air heater absorb heat and transfer the heat to the wind passing through the right first air heater and the right second air heater, thereby increasing the wind temperature.

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