Annular cooler waste heat recovery system

Abstract

The present invention provides a ring cooler waste heat recovery system, comprising a waste heat exchange boiler disposed above a sintering ring cooler. The sintering ring cooler is provided with a first smoke inlet and a first smoke outlet, and the waste heat exchange boiler is provided with a second smoke inlet and a second smoke outlet. Furthermore, a hot smoke delivery pipe is connected between the first smoke outlet and the second smoke inlet, and a cold smoke circulation pipe is connected between the second smoke outlet and the first smoke inlet. The ring cooler waste heat recovery system provided by the present invention can address the low power generation efficiency and high energy waste problems of existing ring cooler waste heat recovery power generation systems.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and more particularly to a waste heat recovery system for a ring cooler. Background Art

[0002] In the power generation process of thermal power plants, sintering machines are usually used to generate electricity. According to the cooling method of sintered ore, sintering machines can be divided into belt cooling sintering machines and ring cooling sintering machines.

[0003] In the actual power generation process, in order to save energy, it is usually necessary to use the waste heat of the sintering furnace for secondary power generation. The corresponding waste heat power generation methods are belt cooling sintering waste heat power generation and ring cooling sintering waste heat power generation.

[0004] For the power generation from waste heat of ring-cooled sintering, the temperature of the high-temperature zone 1 of the ring cooler is about 400℃-450℃, and the temperature of the high-temperature zone 2 is about 350℃-400℃. The working principle of the existing power generation from waste heat of ring-cooled sintering is mainly to utilize the waste heat of the flue gas in the high-temperature area without affecting the cooling process of the sintered ore.

[0005] Specifically, the existing ring-cooled sintering waste heat recovery power generation system mainly recycles and utilizes the waste heat from the front high-temperature area of ​​the cooled sintered ore, then takes in air in a stepped manner and exchanges heat through a waste heat boiler, and finally converts the heat of the flue gas into medium-temperature and medium-pressure steam, which is connected to a new air-supplemented steam turbine generator set to drive the new generator to generate electricity.

[0006] At present, for the existing annularly cooled sintering waste heat recovery power generation system, the annularly cooled sintering furnace and the waste heat boiler belong to two different manufacturers. Due to the process characteristics of the annularly cooled sintering furnace (such as high temperature), the annularly cooled sintering furnace and the waste heat boiler need to be manufactured separately and arranged at a relatively long distance. Therefore, the flue distance between the two is relatively far, often 100m-200m. According to the engineering experience of 1℃ / 10m loss, it will seriously waste energy.

[0007] Based on the above technical problems, a new type of ring-cooled sintering waste heat recovery power generation system layout is urgently needed to reduce energy waste and increase power generation. Summary of the Invention

[0008] In view of the above problems, the object of the present invention is to provide a device that can solve the problems of low power generation efficiency and high energy waste in the existing annular cooler waste heat recovery power generation system.

[0009] The ring cooler waste heat recovery system provided by the present invention comprises a waste heat exchange boiler arranged above a sintering ring cooler, wherein the sintering ring cooler is provided with a first smoke inlet and a first smoke outlet, and the waste heat exchange boiler is provided with a second smoke inlet and a second smoke outlet; and

[0010] A hot smoke delivery pipe is connected between the first smoke outlet and the second smoke inlet, and a cold smoke circulation pipe is connected between the second smoke outlet and the first smoke inlet.

[0011] In addition, a preferred solution is that the hot smoke conveying pipe includes a first rising pipe, a second rising pipe and a transverse connecting pipe; wherein,

[0012] The transverse connecting pipe is connected between the first rising pipe and the second rising pipe. One end of the first rising pipe away from the transverse connecting pipe is connected to the first smoke outlet. One end of the second rising pipe away from the transverse connecting pipe is connected to the second smoke inlet.

[0013] In addition, a preferred solution is that a first bypass flue is provided at the top end of the first riser, and a first baffle door is provided on the first bypass flue.

[0014] In addition, a preferred solution is that an ash discharge port is provided at the bottom end of the second riser.

[0015] In addition, a preferred solution is that the cold smoke circulation duct includes a first circulation flue and a second circulation flue connected to each other; wherein the first circulation flue is connected to the second smoke outlet, and the second circulation flue is connected to the first smoke inlet; and,

[0016] A circulation fan is provided on the first circulation flue, and a booster fan is provided on the second circulation flue.

[0017] In addition, a preferred solution is that a second bypass flue is provided at a position near the second smoke outlet of the first circulating flue, and a third bypass flue is provided at a position near the second circulating flue of the first circulating flue; and a second baffle door is provided in both the second bypass flue and the third bypass flue.

[0018] In addition, a preferred solution is that a third baffle door is connected between the first circulation flue and the second circulation flue.

[0019] In addition, a preferred solution is that at least two first smoke inlets are provided on the sintering ring cooler, and at least two air outlets are provided on the second circulating flue, each of which is connected to the first smoke inlets; and

[0020] The booster fan is arranged in each outlet.

[0021] In addition, a preferred solution is that the sintering ring cooler includes a high temperature zone 1 and a high temperature zone 2, and the hot smoke conveying pipeline is connected between the high temperature zone 1 and the waste heat exchange boiler and between the high temperature zone 2 and the waste heat exchange boiler.

[0022] In addition, a preferred solution is to provide a heat exchange pipe in the waste heat exchange boiler, wherein the inlet end of the heat exchange pipe is connected to an external water supply device, and the outlet end of the heat exchange pipe is connected to an external power generation steam collection device.

[0023] Compared with the prior art, the waste heat recovery system of the annular cooler according to the present invention has the following beneficial effects:

[0024] The ring cooler waste heat recovery system provided by the present invention arranges the waste heat exchange boiler directly above the sintering ring cooler, so that the high-temperature flue gas generated by the sintering ring cooler can be directly introduced into the waste heat exchange boiler through the hot smoke conveying pipe. The high-temperature flue gas forms low-temperature flue gas after heat exchange inside the waste heat exchange boiler, and the low-temperature flue gas is reintroduced into the sintering ring cooler through the cold smoke circulation pipe to complete the flue gas circulation. This compact circulation arrangement can greatly shorten the transmission distance of the flue gas, improve the heat exchange efficiency, increase the steam yield, and increase the power generation. In addition, by arranging a flue bypass in the hot smoke conveying pipe and the cold smoke circulation pipe, it can cope with any emergency accidents without affecting the operation of the main ring cooling process. In addition, this compact circulation arrangement can save the horizontal arrangement space of the waste heat exchange boiler, which has promotion and guiding significance for the transformation, expansion and new construction projects.

[0025] To achieve the above and related ends, one or more aspects of the present invention include features that will be described in detail below and particularly pointed out in the claims. The following description and the accompanying drawings set forth certain exemplary aspects of the present invention in detail. However, these aspects are merely indicative of the various ways in which the principles of the present invention may be employed. Furthermore, the present invention is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By referring to the following description and claims in conjunction with the accompanying drawings, and with a more complete understanding of the present invention, other objects and results of the present invention will become more apparent and readily understood. In the accompanying drawings:

[0027] Figure 1 is a three-dimensional diagram of a waste heat recovery system for an annular cooler according to an embodiment of the present invention;

[0028] Figure 2 A pipeline connection diagram of a waste heat recovery system for an annular cooler according to an embodiment of the present invention;

[0029] Figure 3 This is a partially enlarged view of the hot smoke conveying pipe according to an embodiment of the present invention.

[0030] Figure numerals: sintering ring cooler 1, high temperature zone 1 11, high temperature zone 2 12, first smoke inlet 13, hot smoke conveying pipeline 2, first riser 21, transverse connecting pipe 22, second riser 23, first bypass flue 24, ash discharge port 25, waste heat exchange boiler 3, heat exchange pipeline 31, first circulation flue 4, second bypass flue 41, circulation fan 42, third bypass flue 43, third baffle door 5, second circulation flue 6, booster fan 61.

[0031] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0032] In the following description, for illustrative purposes, numerous specific details are set forth to provide a comprehensive understanding of one or more embodiments. However, it will be apparent that the embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate description of one or more embodiments.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance; in addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Figure 1 The three-dimensional structure of the waste heat recovery system of the ring cooler according to the embodiment of the present invention is shown. Figure 2 The pipe connection structure of the waste heat recovery system of the ring cooler according to an embodiment of the present invention is shown. Figure 3 The figure shows a partially enlarged structure of a hot smoke conveying duct according to an embodiment of the present invention.

[0035] Combine Figures 1 to 3As shown together, the present invention provides a waste heat exchange boiler 3 directly arranged above the sintering ring cooler 1 of the thermal power plant, wherein the sintering ring cooler 1 is used to cool the high-temperature sintered ore generated by the thermal power plant and generate high-temperature flue gas, and the waste heat exchange boiler 3 is used to exchange heat with the high-temperature flue gas generated by the sintering ring cooler 1, thereby transferring the heat of the high-temperature flue gas to the outside to transmit cold water, and extracting hot steam, which is supplied to the power generation device of the thermal power plant for secondary power generation.

[0036] Specifically, it is necessary to set a first smoke inlet 13 and a first smoke outlet on the sintering ring cooler 1, and set a second smoke inlet and a second smoke outlet on the waste heat exchange boiler 3; and a hot smoke conveying pipe 2 is connected between the first smoke outlet and the second smoke inlet, and a cold smoke circulation pipe is connected between the second smoke outlet and the first smoke inlet 13. In the actual process, the high-temperature flue gas generated by the sintering ring cooler 1 is directly introduced into the waste heat exchange boiler 3 through the hot smoke conveying pipe 2. The high-temperature flue gas forms low-temperature flue gas after heat exchange inside the waste heat exchange boiler 3. The low-temperature flue gas is re-introduced into the sintering ring cooler 1 through the cold smoke circulation pipe to complete the flue gas circulation. In this way, not only can the heat in the flue gas be fully utilized, but also a circulating flue gas transmission system can be formed to accelerate the flow of flue gas, thereby improving the heat exchange efficiency.

[0037] In addition, in a specific embodiment of the present invention, the hot smoke conveying pipe 2 may include a first riser 21, a second riser 23 and a transverse connecting pipe 21; wherein the transverse connecting pipe 21 is connected between the first riser 21 and the second riser 23, and the end of the first riser 21 away from the transverse connecting pipe 21 is connected to the first smoke outlet, and the end of the second riser 23 away from the transverse connecting pipe 21 is connected to the second smoke inlet.

[0038] This design not only enables hot smoke to be connected between the sintering ring cooler 1 and the waste heat exchange boiler 3, but also enables the hot smoke conveying pipe 2 to have an N-shaped structure. Compared with a vertical pipe, this pipe with an N-shaped structure can effectively prevent the soot generated in the waste heat exchange boiler 3 from falling and blocking the hot smoke conveying pipe 2, thereby avoiding reducing the heat exchange efficiency or even causing accidents.

[0039] Of course, in order to further prevent the soot generated in the waste heat exchange boiler 3 from falling and blocking the hot smoke conveying pipe 2, an ash discharge port 25 can also be provided at the bottom end of the second riser 23. In actual processing, the second riser 23 can be regularly discharged through the ash discharge port 25 to prevent excessive accumulation of soot at the bottom end of the second riser 23.

[0040] In addition, to cope with emergencies, a first bypass flue 24 can be provided at the top of the first riser 21, and a first baffle door can be provided on the first bypass flue 24. In actual operation, when an emergency occurs, such as a blockage in the hot smoke conveying pipe 2 or a failure in a device or pipe connected to the hot smoke conveying pipe 2, the first baffle door can be opened promptly to promptly guide the hot smoke generated by the sintering ring cooler 1 into the relevant external backup equipment through the first bypass flue 24.

[0041] In addition, in another specific embodiment of the present invention, in order to achieve cold smoke connection between the sintering ring cooler 1 and the waste heat exchange boiler 3, the cold smoke circulation pipe may include a first circulation flue 4 and a second circulation flue 6 connected to each other near the end; wherein the first circulation flue 4 is connected to the second smoke outlet, and the second circulation flue 6 is connected to the first smoke inlet 13.

[0042] In addition, in order to speed up the circulation of cold smoke, a circulation fan 42 can be provided on the first circulation flue 4, and a booster fan 61 can be provided on the second circulation flue 6. By providing the circulation fan 42 and the booster fan 61, the flow speed of the flue gas in the cold smoke circulation duct can be significantly improved, thereby accelerating the heat exchange efficiency of the entire ring cooler waste heat recovery system.

[0043] Of course, to cope with emergencies, a second bypass flue 41 can be provided near the second smoke outlet of the first circulating flue 4, and a third bypass flue 43 can be provided near the second circulating flue 6 of the first circulating flue 4. Furthermore, second baffle doors can be provided in both the second bypass flue 41 and the third bypass flue 43. In practice, when an emergency occurs, the second or third baffle door 5 can be promptly opened, and the cold flue gas generated by the waste heat exchange boiler 3 can be promptly directed to the relevant backup equipment outside through the second or third bypass flue 41 or 43.

[0044] In addition, a third baffle door 5 can be connected between the first circulation flue 4 and the second circulation flue 6. When an emergency occurs and the second bypass flue 41 is used to shoot cold smoke, the third baffle door 5 is needed to block the connection between the first circulation flue 4 and the second circulation flue 6.

[0045] During the actual production process, in order to further accelerate the transmission of flue gas, multiple (at least two) first smoke inlets 13 can be set on the sintering ring cooler 1, and multiple (at least two) air outlets respectively connected to each first smoke inlet 13 are set on the second circulating flue 6; and a corresponding booster fan 61 needs to be set in each outlet to accelerate the transmission of flue gas.

[0046] Specifically, to achieve heat exchange with the high-temperature flue gas, a heat exchange pipe 31 must be installed within the waste heat exchange boiler 3. Furthermore, the inlet of the heat exchange pipe 31 must be connected to an external water supply, while the outlet of the heat exchange pipe 31 must be connected to an external power generation steam collection device. During the actual waste heat recovery process, the high-temperature flue gas generated by the sintering ring cooler 1 vaporizes the external water supply into water vapor through heat exchange with the heat exchange pipe 31. This water vapor is then introduced into the external power generation steam collection device for secondary power generation. The high-temperature flue gas is converted to low-temperature flue gas and circulated through the cold flue gas circulation pipe.

[0047] It should be noted that two high-temperature zones are usually provided inside the sintering ring cooler 1, including a high-temperature zone 11 and a high-temperature zone 2 12. Furthermore, a hot smoke conveying pipe 2 is connected between the high-temperature zone 11 and the waste heat exchange boiler 3, and between the high-temperature zone 2 12 and the waste heat exchange boiler 3. Two heat exchange pipes 31 corresponding to the high-temperature zone 11 and the high-temperature zone 2 12 are provided inside the waste heat exchange boiler 3. In actual operation, the temperature of the high-temperature zone 11 is approximately 400°C-450°C, and the temperature of the high-temperature zone 2 12 is approximately 350°C-400°C. Through this design, the high-temperature zone 11 and the high-temperature zone 2 12 can be separately heat exchanged, thereby improving the heat exchange efficiency.

[0048] From the above specific embodiments, it can be seen that the waste heat recovery system for the annular cooler provided by the present invention has at least the following advantages:

[0049] 1. By placing the waste heat exchange boiler directly above the sintering ring cooler, the high-temperature flue gas generated by the sintering ring cooler can be directly introduced into the waste heat exchange boiler through the hot flue gas transmission pipeline. After heat exchange in the waste heat exchange boiler, the high-temperature flue gas forms low-temperature flue gas, which is then reintroduced into the sintering ring cooler through the cold flue gas circulation pipeline, completing the flue gas circulation. This compact circulation arrangement can significantly shorten the flue gas transmission distance (primarily shortening the high-temperature flue gas pipeline in front of the waste heat exchange boiler and shortening the high-temperature flue gas pipeline after the waste heat exchange boiler), improving heat exchange efficiency, increasing steam production, and increasing power generation.

[0050] 2. By setting up flue bypass in the hot smoke conveying pipe and the cold smoke circulation pipe, it is possible to deal with any emergency accidents without affecting the operation of the main ring cooling process.

[0051] 3. This compact circulation layout can save the horizontal layout space of the waste heat exchange boiler, and has promotion and guiding significance for renovation, expansion and new construction projects.

[0052] As above Figures 1 to 3The annular cooler waste heat recovery system according to the present invention is described by way of example. However, those skilled in the art will appreciate that various improvements can be made to the annular cooler waste heat recovery system described above without departing from the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the contents of the appended claims.

Claims

1. A waste heat recovery system for an annular cooler, characterized in that: It comprises a waste heat exchange boiler arranged above a sintering ring cooler, wherein the sintering ring cooler is provided with a first smoke inlet and a first smoke outlet, and the waste heat exchange boiler is provided with a second smoke inlet and a second smoke outlet; and A hot smoke delivery pipe is connected between the first smoke outlet and the second smoke inlet, and a cold smoke circulation pipe is connected between the second smoke outlet and the first smoke inlet; The hot smoke conveying pipe has an N-shaped structure, and includes a first ascending pipe, a second ascending pipe and a transverse connecting pipe; wherein the transverse connecting pipe is connected between the first ascending pipe and the second ascending pipe, and the end of the first ascending pipe away from the transverse connecting pipe is connected to the first smoke outlet, and the end of the second ascending pipe away from the transverse connecting pipe is connected to the second smoke inlet.

2. The waste heat recovery system for annular cooler according to claim 1, characterized in that: A first bypass flue is provided at the top end of the first ascending pipe, and a first baffle door is provided on the first bypass flue.

3. The waste heat recovery system for annular cooler according to claim 1, characterized in that: An ash discharge port is provided at the bottom end of the second rising pipe.

4. The waste heat recovery system for annular cooler according to claim 1, characterized in that: The cold smoke circulation duct includes a first circulation flue and a second circulation flue connected to each other; wherein the first circulation flue is connected to the second smoke outlet, and the second circulation flue is connected to the first smoke inlet; and A circulation fan is provided on the first circulation flue, and a booster fan is provided on the second circulation flue.

5. The waste heat recovery system for annular cooler according to claim 4, characterized in that: A second bypass flue is provided at a position of the first circulating flue close to the second smoke outlet, and a third bypass flue is provided at a position of the first circulating flue close to the second circulating flue; and second baffle doors are provided in both the second bypass flue and the third bypass flue.

6. The waste heat recovery system for annular cooler according to claim 4, characterized in that: A third baffle door is connected between the first circulation flue and the second circulation flue.

7. The waste heat recovery system for annular cooler according to claim 4, characterized in that: There are at least two first smoke inlets on the sintering ring cooler, and at least two air outlets respectively connected to the first smoke inlets are provided on the second circulating flue; and The booster fan is arranged in each outlet.

8. The waste heat recovery system for annular cooler according to any one of claims 1 to 7, characterized in that: The sintering ring cooler includes a high-temperature zone 1 and a high-temperature zone 2. The hot smoke conveying pipeline is connected between the high-temperature zone 1 and the waste heat exchange boiler, and between the high-temperature zone 2 and the waste heat exchange boiler.

9. The waste heat recovery system for annular cooler according to claim 8, characterized in that: A heat exchange pipe is provided in the waste heat exchange boiler, wherein the inlet end of the heat exchange pipe is connected to an external water supply device, and the outlet end of the heat exchange pipe is connected to an external power generation steam collecting device.

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