A waste heat boiler system and a kiln system

Abstract

The present invention discloses a waste heat boiler system and a kiln system. The waste heat boiler system includes a flue gas passage, a first bypass passage, and a denitration reaction device. The flue gas passage is sequentially provided with a first valve and a second valve along the flowing direction of the flue gas. The denitration reaction device is installed in the flue gas passage and is located between the first valve and the second valve. The denitration reaction device is provided with a denitration catalyst. The kiln system includes the waste heat boiler system. The waste heat boiler system simplifies the equipment structure by arranging the denitration reaction device in the flue gas passage. When the denitration catalyst loses its activity, the first valve and the second valve can be closed and the third valve can be opened, so that the flue gas flows out through the flue gas inlet, the first bypass passage, and the flue gas outlet in sequence. Maintenance personnel can then perform maintenance work on the flue gas passage between the first valve and the second valve and replace the denitration catalyst, realizing the function of replacing the denitration catalyst in real time and facilitating maintenance and replacement.

Description

Technical Field

[0001] The present invention is used in the technical field of glass waste heat boilers, and particularly relates to a waste heat boiler system and a kiln system. Background Art

[0002] A glass kiln waste heat boiler is a set of waste heat boilers installed on the tail flue of a glass kiln, which can achieve the purpose of recovering waste flue gas heat and protecting the environment. During the glass processing, a denitration system is required for the waste heat boiler to denitrate the flue gas generated by the glass kiln. Since the denitration catalyst in the denitration system loses its activity during use, the denitration catalyst needs to be replaced in a timely manner. However, during the glass processing, the glass waste heat boiler can only operate continuously without stopping the furnace, so the traditional waste heat boiler system can only use medium-temperature (380°C - 400°C) SCR catalysts arranged outside the furnace to denitrate the flue gas. This way of arranging the denitration catalyst outside the furnace makes the structure of the waste heat boiler system extremely complex, prone to blockage, and the high-temperature part of the flue gas passage cannot be denitrated, resulting in untimely acid removal and serious corrosion of the front part of the flue gas passage. Summary of the Invention

[0003] An object of the present invention is to solve at least one of the technical problems existing in the prior art, and provide a waste heat boiler system and a kiln system, which can place the denitration catalyst in the flue gas passage and at the same time realize the function of replacing the denitration catalyst in real time, solve the problem of blockage of the denitration catalyst, and facilitate the maintenance and replacement work.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] In a first aspect, a waste heat boiler system includes a flue gas passage, a first bypass passage, and a denitration reaction device. The flue gas passage has a flue gas inlet and a flue gas outlet. The flue gas passage is sequentially provided with a first valve and a second valve along the flow direction of the flue gas. The denitration reaction device is installed in the flue gas passage and is located between the first valve and the second valve. The denitration reaction device is provided with a denitration catalyst. One end of the first bypass passage is connected to the flue gas passage on the side of the first valve close to the flue gas inlet, and the other end of the first bypass passage is connected to the flue gas passage on the side of the second valve close to the flue gas outlet. A third valve is provided on the first bypass passage.

[0006] In combination with the first aspect, in some implementations of the first aspect, a first water tube evaporator, a heat pipe evaporator, and a second water tube evaporator are successively arranged in the flue gas passage between the denitration reaction device and the second valve. One end of the heat pipe evaporator is connected to a boiler drum, water is provided in the boiler drum, and the other end of the heat pipe evaporator extends into the flue gas passage. A third water tube evaporator is arranged in the flue gas passage between the second valve and the first bypass passage.

[0007] In combination with the first aspect and the above implementations, in some implementations of the first aspect, a second bypass passage is further included. One end of the second bypass passage is connected to the flue gas passage between the second water tube evaporator and the second valve, and the other end of the second bypass passage is connected to the flue gas passage at the flue gas outlet. A fourth valve is provided on the second bypass passage, and a maintenance opening is provided in the flue gas passage at the third water tube evaporator.

[0008] In combination with the first aspect and the above implementations, in some implementations of the first aspect, first converging sections are provided on both sides of the first valve in the flue gas passage, and the first converging sections converge in the direction close to the first valve. Second converging sections are provided on both sides of the second valve in the flue gas passage, and the second converging sections converge in the direction close to the second valve.

[0009] In combination with the first aspect and the above implementations, in some implementations of the first aspect, an induced draft fan is further included. A first cold air inlet is provided on the side of the first valve in the flue gas passage close to the flue gas inlet, and a second cold air inlet is provided on the side of the second valve in the flue gas passage close to the flue gas outlet. The induced draft fan is used to introduce air into the first cold air inlet and the second cold air inlet, and fifth valves are provided at both the first cold air inlet and the second cold air inlet.

[0010] In combination with the first aspect and the above implementations, in some implementations of the first aspect, the first valve, the second valve, the third valve, the fourth valve, and the fifth valve all include electric valves.

[0011] In combination with the first aspect and the above implementations, in some implementations of the first aspect, an ammonia injection device is provided at the flue gas inlet, ammonia water is provided in the ammonia injection device, and the ammonia injection device is used to spray the ammonia water into the flue gas passage.

[0012] In combination with the first aspect and the above implementations, in some implementations of the first aspect, a spray cooling device is provided at the flue gas outlet, a spray liquid is provided in the spray cooling device, and the spray cooling device is used to spray the spray liquid into the flue gas passage.

[0013] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, a drain opening is provided at the flue gas outlet of the flue gas passage, and a drain valve is provided on the drain opening.

[0014] In a second aspect, a kiln system includes the waste heat boiler system according to any one of the implementation manners of the first aspect.

[0015] One of the technical solutions in the above technical solutions has at least the following advantages or beneficial effects: The waste heat boiler system in this technical solution simplifies the equipment structure by arranging a denitration reaction device in the flue gas passage, and the flue gas can react quickly with the denitration catalyst to solve the problem of blockage of the denitration catalyst. At the same time, by adopting the method of connecting the first bypass passage to both ends of the flue gas passage, when the denitration catalyst loses its activity, the first valve and the second valve can be closed and the third valve can be opened, so that the flue gas flows out through the flue gas inlet, the first bypass passage, and the flue gas outlet in sequence to enter the next process. The maintenance personnel can then perform maintenance work on the flue gas passage between the first valve and the second valve and replace the denitration catalyst in the denitration reactor, realizing the function of replacing the denitration catalyst in real time and facilitating maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the drawings:

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0018] Figure 2 is Figure 1 a front view schematic diagram of the shown embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0020] In the present invention, if directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding" do not include the corresponding number; understandings such as "above", "below", "within" include the corresponding number. In the description of the present invention, if there is a description of "first" and "second", they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0022] In the present invention, unless otherwise clearly defined, terms such as "arranged", "installed", "connected" should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

[0023] See Figure 1 , an embodiment of the present invention provides a waste heat boiler system, including a flue gas passage 1, a first bypass passage 2 and a denitration reaction device 3. The flue gas passage 1 has a flue gas inlet 11 and a flue gas outlet 12. The flue gas passage 1 is sequentially provided with a first valve 41 and a second valve 42 along the flow direction of the flue gas, that is, the flue gas passage 1 is sequentially provided with a flue gas inlet 11, a first valve 41, a second valve 42 and a flue gas outlet 12 along the flow direction of the flue gas. The denitration reaction device 3 is installed in the flue gas passage 1 and is located between the first valve 41 and the second valve 42, which can simplify the equipment structure. A denitration catalyst is provided in the denitration reaction device 3. When the flue gas flows into the flue gas passage 1, it can quickly react with the denitration catalyst to carry out denitration and acid removal, avoiding blockage and corrosion of the flue gas passage 1. One end of the first bypass passage 2 is connected to the flue gas passage 1 on the side of the first valve 41 close to the flue gas inlet 11, and the other end of the first bypass passage 2 is connected to the flue gas passage 1 on the side of the second valve 42 close to the flue gas outlet 12. A third valve 43 is provided on the first bypass passage 2 to control the opening or closing of the first bypass passage 2. When it is not necessary to replace the denitration catalyst or perform other maintenance work (that is, when the waste heat boiler is in a normal working state), the third valve 43 is closed and the first valve 41 and the second valve 42 are opened, and the flue gas can flow out through the flue gas passage 1 and the flue gas outlet 12 in sequence after entering through the flue gas inlet 11; when it is necessary to replace the denitration catalyst or perform other maintenance work, the third valve 43 is opened and the first valve 41 and the second valve 42 are closed, and the flue gas can flow out through the first bypass passage 2 and the flue gas outlet 12 in sequence after entering through the flue gas inlet 11, so as to facilitate the switching between the maintenance replacement mode and the normal working mode.

[0024] In the waste heat boiler system of this technical solution, by arranging a denitration reaction device 3 in the flue gas passage 1, the equipment structure is simplified, and the flue gas can react quickly with the denitration catalyst, solving the problem of blockage of the denitration catalyst. At the same time, the first bypass passage 2 is connected to both ends of the flue gas passage 1. When the denitration catalyst loses its activity, the first valve 41 and the second valve 42 can be closed, and the third valve 43 can be opened, so that the flue gas flows out through the flue gas inlet 11, the first bypass passage 2, and the flue gas outlet 12 in sequence to enter the next process. Maintenance personnel can then perform maintenance work on the flue gas passage 1 between the first valve 41 and the second valve 42 and replace the denitration catalyst in the denitration reactor, realizing the function of replacing the denitration catalyst in real time and facilitating maintenance and replacement.

[0025] See Figure 1 and Figure 2 , in some embodiments, a first water tube evaporator 51, a heat pipe evaporator 52, and a second water tube evaporator 53 are sequentially arranged between the denitration reaction device 3 and the second valve 42 in the flue gas passage 1, that is, the first valve 41, the denitration reaction device 3, the first water tube evaporator 51, the heat pipe evaporator 52, the second water tube evaporator 53, and the second valve 42 are arranged in sequence along the flue gas flow direction. Placing the denitration reaction device 3 in front of each evaporator can use the high-temperature denitration catalyst to denitrate the flue gas, with high denitration efficiency and high sulfur resistance. In addition, performing denitration work at the high-temperature stage of the waste heat boiler, that is, the front part of the waste heat boiler, can effectively avoid the problem of corrosion of the front part of the waste heat boiler caused by denitration in the middle of the traditional waste heat boiler, reducing equipment costs.

[0026] See Figure 1 , one end of the heat pipe evaporator 52 is connected to the drum 54, water is provided in the drum 54, and the other end of the heat pipe evaporator 52 extends into the flue gas passage 1 to absorb the heat in the flue gas passage 1 through the heat pipe evaporator 52. The water in the drum 54 flows through the heat pipes of the heat pipe evaporator 52 into the flue gas passage 1 to absorb the heat of the flue gas and evaporate. After the water evaporates to form steam, it flows back to the drum 54 in the reverse direction and condenses into water in the drum 54, and so on. By using the two-way fluid to circulate in the heat pipes of the heat pipe evaporator 52 and the drum 54, the purpose of efficient heat transfer can be achieved. Specifically, the temperature of the flue gas entering from the flue gas inlet 11 is about 450°C - 500°C. The first water tube evaporator 51 exchanges heat with the high-temperature flue gas to reduce the flue gas temperature. When the flue gas temperature cools to 350°C - 380°C, the heat pipe evaporator 52 can cool it. The flue gas in this temperature range can ensure that the heat pipes do not burst and at the same time achieve efficient heat exchange. The heat pipe evaporator 52 absorbs the heat of the flue gas and reduces the flue gas to about 270°C - 300°C, and then the second water tube evaporator 53 cools the flue gas to about 240°C - 270°C.

[0027] See Figure 1 andFigure 2 Between the second valve 42 and the first bypass passage 2 of the flue gas passage 1, a third water tube evaporator 55 is provided. After the flue gas passes through the second water tube evaporator 53 and then through the third water tube evaporator 55, it can be cooled to 170°C - 200°C, meeting the temperature requirements of the next process such as desulfurization. By making full use of the advantages of strong water tube stability of the water tube evaporator and high heat pipe heat transfer coefficient of the heat pipe evaporator 52, and by mixing the use of heat pipes and water tubes in the flue gas passage 1 and reasonably setting the distribution positions of the heat pipe evaporator 52 and the water tube evaporator, the problems of heat pipe burst and low heat pipe life can be solved, the working stability can be improved, and at the same time, the temperature can be effectively reduced, and the use cost of the waste heat boiler can be reduced.

[0028] See Figure 1 In some embodiments, the waste heat boiler system further includes a second bypass passage 6. One end of the second bypass passage 6 is connected between the second water tube evaporator 53 and the second valve 42 of the flue gas passage 1, and the other end of the second bypass passage 6 is connected to the flue gas passage 1 at the flue gas outlet 12. A fourth valve 44 is provided on the second bypass passage 6, and a maintenance port 13 is provided on the flue gas passage 1 at the third water tube evaporator 55. When the flue gas passage 1 can be used normally, the fourth valve 44 is closed, and the flue gas is cooled by the third water tube evaporator 55 and then flows out from the flue gas outlet 12; when a failure occurs in the third water tube evaporator 55 in the flue gas passage 1, the second valve 42 can be closed and the fourth valve 44 can be opened, so that the flue gas passes through the second water tube evaporator 53 and then flows to the flue gas outlet 12 through the second bypass passage 6, and the maintenance personnel can repair the third water tube evaporator 55 through the maintenance port 13, meeting the requirement of continuous operation of the kiln furnace.

[0029] When problems such as the inactivation of the denitration catalyst activity in the flue gas passage 1 or the failure of the third water tube evaporator 55 occur, it is necessary to stop the operation of the flue gas passage 1 and make the flue gas flow through the first bypass passage 2 or the second bypass passage 6. See Figure 1 In some embodiments, a spray cooling device 71 is provided at the flue gas outlet 12. The spray cooling device 71 is provided with a spray liquid, and the spray cooling device 71 is used to spray the spray liquid onto the flue gas passage 1 to cool the temperature of the flue gas and reduce the exhaust gas temperature to below 200°C.

[0030] See Figure 1 In some embodiments, a drain port 72 is provided at the flue gas outlet 12 of the flue gas passage 1 to drain the spray liquid in the flue gas passage 1. A drain valve 73 is provided on the drain port 72 to facilitate controlling the drainage according to the usage situation.

[0031] See Figure 1, in some embodiments, the waste heat boiler system further includes an induced draft fan. A first cold air inlet 81 is provided on one side of the first valve 41 close to the flue gas inlet 11 in the flue gas passage 1, and a second cold air inlet 82 is provided on one side of the second valve 42 close to the flue gas outlet 12 in the flue gas passage 1. The induced draft fan is used to introduce cold air into the first cold air inlet 81 and the second cold air inlet 82, and a fifth valve 45 is provided at each of the first cold air inlet 81 and the second cold air inlet 82. When the flue gas flows through the first bypass passage 2, the fifth valve 45 can be opened so that the cold air flows into the first bypass passage 2 through the first cold air inlet 81 and the second cold air inlet 82 to cool the flue gas and reduce the flue gas temperature.

[0032] See Figure 1 , in some embodiments, an ammonia injection device 74 is provided at the flue gas inlet 11. Ammonia water is provided in the ammonia injection device 74, and the ammonia injection device 74 is used to spray the ammonia water into the flue gas passage 1. When the flue gas passage 1 is operating normally, the ammonia water can be sprayed at the flue gas inlet 11 of the flue gas passage 1, which is suitable for rapid denitrification in a high-temperature environment and meets the use requirements of the waste heat boiler of the glass furnace.

[0033] See Figure 1 and Figure 2 , in some embodiments, first converging sections 14 are provided on both sides of the first valve 41 in the flue gas passage 1. The first converging sections 14 converge in the direction close to the first valve 41 to facilitate the installation of the first valve 41. Second converging sections 15 are provided on both sides of the second valve 42 in the flue gas passage 1. The second converging sections 15 converge in the direction close to the second valve 42 to facilitate the installation of the second valve 42.

[0034] In some embodiments, the first valve 41, the second valve 42, the third valve 43, the fourth valve 44 and the fifth valve 45 all include electric valves, which facilitate the control of the opening and closing of each valve.

[0035] Another embodiment of the present invention provides a furnace system including a waste heat boiler system. Since the waste heat boiler system has been described in detail above, it will not be repeated here.

[0036] In the description of this specification, the description with reference to terms such as "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0037] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A waste heat boiler system, characterized in that, It includes an induced draft fan, a flue gas passage, a first bypass passage and a denitration reaction device. The flue gas passage has a flue gas inlet and a flue gas outlet. Along the flow direction of the flue gas, a first valve and a second valve are sequentially arranged in the flue gas passage. The denitration reaction device is installed in the flue gas passage and is located between the first valve and the second valve. A denitration catalyst is provided in the denitration reaction device. One end of the first bypass passage is connected to the flue gas passage on the side of the first valve close to the flue gas inlet, and the other end of the first bypass passage is connected to the flue gas passage on the side of the second valve close to the flue gas outlet. A third valve is provided on the first bypass passage. A first water tube evaporator, a heat pipe evaporator and a second water tube evaporator are sequentially arranged in the flue gas passage between the denitration reaction device and the second valve. One end of the heat pipe evaporator is connected to a boiler drum, and water is provided in the boiler drum. The other end of the heat pipe evaporator extends into the flue gas passage. It further includes a second bypass passage. One end of the second bypass passage is connected to the flue gas passage between the second water tube evaporator and the second valve, and the other end of the second bypass passage is connected to the flue gas passage at the flue gas outlet. A fourth valve is provided on the second bypass passage. A third water tube evaporator is provided in the flue gas passage between the second valve and the first bypass passage; A first cold air inlet is provided on the side of the first valve in the flue gas passage close to the flue gas inlet, and a second cold air inlet is provided on the side of the second valve in the flue gas passage close to the flue gas outlet. The induced draft fan is used to introduce cold air into the first cold air inlet and the second cold air inlet. Fifth valves are provided at both the first cold air inlet and the second cold air inlet; Among them, the temperature of the flue gas entering from the flue gas inlet is set at 450°C - 500°C. The first water tube evaporator exchanges heat with the high-temperature flue gas to reduce the flue gas temperature. When the flue gas temperature cools to 350°C - 380°C, the heat pipe evaporator cools the flue gas.

2. The waste heat boiler system according to claim 1, wherein: An inspection opening is provided in the flue gas passage at the third water tube evaporator.

3. The waste heat boiler system according to claim 1, wherein: The first valve, the second valve, the third valve, the fourth valve and the fifth valve all include electric valves.

4. The waste heat boiler system according to claim 1, wherein: First converging sections are provided on both sides of the first valve in the flue gas passage. The first converging sections converge towards the first valve. Second converging sections are provided on both sides of the second valve in the flue gas passage. The second converging sections converge towards the second valve.

5. The waste heat boiler system according to claim 1, characterized in that: A ammonia injection device is provided at the flue gas inlet. Ammonia water is provided in the ammonia injection device. The ammonia injection device is used to spray the ammonia water into the flue gas passage.

6. The waste heat boiler system according to claim 1, wherein: A spray cooling device is provided at the flue gas outlet. Spray liquid is provided in the spray cooling device. The spray cooling device is used to spray the spray liquid into the flue gas passage.

7. The waste heat boiler system according to claim 6, characterized in that: A drain opening is provided in the flue gas passage at the flue gas outlet. A drain valve is provided on the drain opening.

8. A kiln system, characterized in that: It includes the waste heat boiler system according to any one of claims 1 to 7.

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