Kiln waste heat exchange device

Abstract

The utility model relates to the technical field of heat exchange equipment, and discloses a kiln waste heat exchange device which comprises a first water tank, a second water tank, a first heat source pipe, a second heat source pipe, a third heat source pipe and heat exchange terminal equipment. The saturated hot water is conveyed to the first water tank; the second heat source pipe is communicated with the water inlet end of the heat exchange terminal equipment and the first water tank; the top of the second water tank is communicated with the outside, the third heat source pipe is communicated with the first water tank and the second water tank, and the outlet end of the third heat source pipe is immersed below the liquid level of the second water tank so that high-temperature steam of the first water tank can be conveyed to the second water tank. According to the kiln waste heat exchange device, the utilization efficiency and safety of kiln waste heat can be improved, and the heat exchange effect is stabilized.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchange equipment technical field especially relates to a kiln waste heat heat exchange device. BACKGROUND

[0002] In the building ceramic kiln, there are many schemes of waste heat utilization, such as using the cooled waste heat to heat combustion-supporting air, using the cooled waste heat to dry kiln, etc., which help to use energy more efficiently and save energy.

[0003] However, some waste heat utilization schemes still have problems such as unstable heat exchange effect and potential safety hazards.

[0004] For example, the existing technology applies waste heat to the process of atomizing and heating slurry into granular raw materials to reduce the energy consumption of raw material granulation. Specifically, cold water is sent into the cooling section of the kiln for heating, and then high-temperature hot water is directly sent into the heat exchange terminal equipment. This heat exchange method is not easy to control the temperature of hot water. Since the heat exchange area of hot water is fixed and the high-temperature heat source is also fixed, when the water quantity is large, the water temperature will be reduced; when the water quantity is small, the water temperature will be high, and high-temperature and high-pressure steam is easy to be produced, which affects the safety of the pipeline and the heat exchange effect of the heat exchange terminal equipment. SUMMARY

[0005] The technical problem to be solved by the utility model is to provide a kiln waste heat heat exchange device to improve the utilization efficiency and safety of kiln waste heat and stabilize the heat exchange effect.

[0006] To solve the above technical problems, the utility model provides a kiln waste heat heat exchange device, which comprises a first water tank, a second water tank, a first heat source pipe, a second heat source pipe, a third heat source pipe and a heat exchange terminal equipment,

[0007] The first heat source pipe is used for conveying the cooling water of the second water tank to the kiln to form saturated hot water and conveying the saturated hot water to the first water tank.

[0008] The second heat source pipe is connected between the water inlet end of the heat exchange terminal equipment and the first water tank.

[0009] The top of the second water tank is communicated with the outside, the third heat source pipe is connected between the first water tank and the second water tank, and the outlet end of the third heat source pipe is submerged below the liquid level of the second water tank to convey the high-temperature steam of the first water tank to the second water tank.

[0010] As an improvement of the above scheme, at least one of the first heat source pipe and the second heat source pipe is provided with a flow divider plate submerged in the liquid in the tank at the outlet end.

[0011] As the improvement of the above-mentioned scheme, the center of the shunt plate is provided with a through hole communicated with the first heat source pipe or the second heat source pipe, and a plurality of filter holes are arranged on the shunt plate in the circumferential direction of the through hole.

[0012] As the improvement of the above-mentioned scheme, a plurality of array layers formed by the filter holes are arranged on the shunt plate, each of the array layers is arranged around the through hole, the diameter of the filter hole of the array layer gradually increases from the center of the shunt plate to the edge, and the number of array layers gradually increases from the center of the shunt plate to the edge.

[0013] As the improvement of the above-mentioned scheme, the first water tank is closed, and the third heat source pipe is provided with a preset distance from the liquid surface of the first water tank.

[0014] As the improvement of the above-mentioned scheme, the first water tank is provided with a first water level sensor, the first heat source pipe is provided with a first water pump, and the first water pump and the first water level sensor are connected with a first controller.

[0015] As the improvement of the above-mentioned scheme, the second heat source pipe is provided with a second water pump, and the second water pump and the heat exchange terminal device are connected with a second controller.

[0016] As the improvement of the above-mentioned scheme, the heat exchange terminal device is further provided with a first cold water pipe communicated with the second water tank.

[0017] As the improvement of the above-mentioned scheme, the second water tank is further provided with a second cold water pipe and a second water level sensor, the second cold water pipe is communicated with an external water source, the second cold water pipe is provided with an electromagnetic valve, and the electromagnetic valve and the second water level sensor are connected with a third controller.

[0018] As the improvement of the above-mentioned scheme, the bottom of the first water tank and the bottom of the second water tank are provided with a sewage valve.

[0019] The present application has the following advantages:

[0020] This utility model discloses a waste heat exchange device for a kiln. The medium (cooling water) in the second water tank is fed through the kiln cooling section via a first heat source pipe, forming a heat source (saturated hot water) which is then introduced into the first water tank. High-temperature steam from the saturated hot water in the first water tank is transported by a third heat source pipe to the area below the liquid surface in the second water tank, where it exchanges heat with the cooling water. This significantly reduces the amount of high-temperature steam entering the second heat source pipe and the heat exchange terminal equipment from the first water tank, improving pipeline and equipment safety. It also avoids heat loss, improving heat recycling efficiency. The high-temperature liquid water in the first water tank is transported to the heat exchange terminal equipment via the second heat source pipe, enabling the reuse of waste heat from the kiln. Simultaneously, the high-temperature liquid water is stored in the first water tank, ensuring a stable and controllable flow rate of heat source delivered to the heat exchange terminal equipment, thus improving the stability of the equipment's heat exchange. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of a waste heat exchange device for a kiln according to the present invention;

[0022] Figure 2 This is a schematic diagram of the first structure of the first diverter plate;

[0023] Figure 3 This is a schematic diagram of the second structure of the first flow divider;

[0024] Figure 4 This is a schematic diagram of the first structure of the second diverter plate;

[0025] Figure 5 This is a schematic diagram of the second structure of the second diverter plate. Detailed Implementation

[0026] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0027] Figures 1 to 5 As shown, this utility model discloses an embodiment of a waste heat exchange device for a kiln, including a first water tank 1, a second water tank 2, a first heat source pipe 3, a second heat source pipe 4, a third heat source pipe 5, and a heat exchange terminal device 6. The first heat source pipe 3 is used to transport the cooling water from the second water tank 2 to the kiln 7 to form saturated hot water, and then transport the saturated hot water to the first water tank 1. The second heat source pipe 4 connects the inlet end of the heat exchange terminal device 6 to the first water tank 1 to transport the high-temperature liquid water in the saturated hot water of the first water tank 1 to the heat exchange terminal device 6. The top of the second water tank 2 is provided with an exhaust pipe 21 that communicates with the outside atmosphere. The outlet end of the third heat source pipe 5 is submerged below the liquid surface of the second water tank 2 to transport the high-temperature steam in the saturated hot water of the first water tank 1 to the second water tank 2.

[0028] Since the kiln 7 is a high energy consumption and high carbon emission equipment, the building ceramic kiln 7 has utilized most of the waste heat in the processes before and after the kiln 7, but the cooling section 71 of the kiln 7 still has a lot of waste heat that has not been utilized, so the cooling water in the first heat source pipe 3 is transported to the cooling section 71 of the roller kiln to exchange heat, forming saturated hot water in a high temperature state. The saturated hot water has high temperature liquid water itself and also carries a part of high temperature steam.

[0029] It should be noted that the temperature of the cooling section 71 of the kiln 7 reaches 300-500℃, and by increasing or decreasing the pipe length of the first heat source pipe 3 passing through the cooling section 71 of the kiln 7, the temperature of the medium in the first heat source pipe 3 passing through the cooling section 71 can be adjusted. The part of the first heat source pipe 3 passing through the cooling section 71 in the embodiment should meet the requirement that the medium in the first heat source pipe 3 passing through the cooling section 71 reaches a saturated high temperature state, that is, the temperature of the medium stored in the first water tank 1 is basically the same as the temperature of the medium transported into the first heat source pipe 3, which can ensure the stability of the medium temperature in the first water tank 1.

[0030] In the embodiment, the medium (i.e. cooling water) of the second water tank 2 is transported through the cooling section 71 by the first heat source pipe 3 to form a heat source (i.e. saturated hot water) that is transported into the first water tank 1. The high temperature steam in the saturated hot water in the first water tank 1 is transported below the liquid surface of the second water tank 2 by the third heat source pipe 5 to exchange heat with the cooling water of the second water tank 2. On the one hand, the high temperature steam transported from the first water tank 1 into the second heat source pipe 4 and the heat exchange terminal equipment 6 is greatly reduced, which helps to improve the safety of the pipeline and equipment. On the other hand, heat loss is avoided, which helps to improve the efficiency of heat recycling. The high temperature liquid water in the first water tank 1 is transported to the heat exchange terminal equipment 6 by the second heat source pipe 4, realizing the reuse of the waste heat of the kiln 7. At the same time, the high temperature liquid water is stored in the first water tank 1, so that the flow of the heat source transported to the heat exchange terminal equipment 6 is stable and controllable, which improves the stability of the equipment heat exchange.

[0031] The outlet end of the first heat source pipe 3 is immersed below the liquid surface of the first water tank 1, the outlet end of the second heat source is immersed below the liquid surface of the second water tank 2, and the first heat source pipe 3 is provided with a first flow dividing plate 31 immersed in the liquid in the first water tank 1 at the outlet end, and the third heat source pipe 5 is provided with a second flow dividing plate 51 immersed in the liquid in the second water tank 2 at the outlet end.

[0032] The center of the first flow dividing plate 31 is provided with a first through hole 311 in communication with the first heat source pipe 3, and a plurality of first filter holes 312 are arranged on the first flow dividing plate 31 along the circumference of the first through hole 311; the center of the second flow dividing plate 51 is provided with a second through hole 511 in communication with the third heat source pipe 5, and a plurality of second filter holes 512 are arranged on the second flow dividing plate 51 along the circumference of the second through hole 511.

[0033] The saturated hot water is divided into high-temperature liquid water and high-temperature steam by the first shunt plate 31 in the first water tank 1. The saturated hot water can ensure the stability of the liquid temperature in the first water tank 1, and the excess heat will be transported to the second water tank 2 in the form of high-temperature steam through the third heat source pipe 5 to avoid heat loss. The first through hole 311 of the first shunt plate 31 helps to break bubbles, promotes the floating of high-temperature steam, and is transported to the second water tank 2 by the third heat source pipe 5, further reducing the high-temperature steam into the second heat source pipe 4 and the heat exchange terminal equipment 6, and improving the safety of the pipeline and equipment. The high-temperature steam is divided by the second shunt plate 51 in the second water tank 2. The second shunt plate 51 expands the contact area of the high-temperature steam and the liquid in the second water tank 2, which can improve the heat exchange efficiency of the second water tank 2. At the same time, the second filter hole 512 on the second shunt plate 51 helps to break large bubbles and form countless small bubbles, further increasing the heat exchange area and improving the heat exchange efficiency.

[0034] The first shunt plate 31 in the first water tank 1 is provided with a first through hole 311 communicated with the first heat source pipe 3. The saturated hot water of the first heat source pipe 3 is injected into the liquid in the first water tank 1 by the first through hole 311 of the first shunt plate 31. Since the saturated hot water transported by the first heat source pipe 3 is immersed in the liquid in the first water tank 1, a large number of bubbles will be generated. The shunt plate of the embodiment is preferably horizontally arranged. The first shunt plate 31 is provided with a plurality of array layers formed by the first filter hole 312. Specifically, the first shunt plate 31 is provided with a first array layer a, a second array layer b, a third array layer c and a fourth array layer d arranged from the center to the edge of the first shunt plate 31. Each array layer is arranged around the first through hole 311, and each array layer is provided with at least two rows of arrays. The diameter of the first filter hole 312 of the array layer from the center to the edge of the first shunt plate 31 gradually increases, and the number of arrays of the array layer from the center to the edge of the first shunt plate 31 gradually increases, so as to divide the high-temperature hot water or high-temperature steam as much as possible, accelerate the separation of high-temperature steam and high-temperature hot water, and reduce the high-temperature steam into the second heat source pipe 4.

[0035] The second water tank 2 in the second embodiment is provided with a second through hole 511 communicating with the third heat source pipe 5, and the high-temperature steam of the third heat source pipe 5 is injected downward into the liquid in the second water tank 2 through the second through hole 511 of the second distribution plate 51. Since the saturated hot water transported by the third heat source pipe 5 is immersed in the liquid in the second water tank 2, a large number of bubbles will be generated. The second distribution plate 51 in the embodiment is preferably horizontally arranged, and is provided with a plurality of array layers formed by second filter holes 512. Specifically, the second distribution plate 51 is provided with a first array layer e, a second array layer f, a third array layer g and a fourth array layer h arranged in sequence from the center to the edge of the second distribution plate 51. Each array layer is arranged around the through hole, and each array layer is provided with at least two rows of arrays. The diameters of the second filter holes 512 of the array layers gradually increase from the center to the edge of the second distribution plate 51, and the number of arrays of the array layers gradually increases from the center to the edge of the second distribution plate 51, so as to divert the high-temperature hot water or high-temperature steam as much as possible, break the large bubbles into countless small bubbles, increase the heat exchange area, realize gas-liquid separation, and avoid the bubbles entering the first heat source pipe 3, thereby affecting the stability and safety of the heat exchange effect of the first heat source pipe 3 and the kiln 7.

[0036] The first water tank 1 in the embodiment is a sealed water tank, which can send high-temperature steam to the second water tank 2 through the pressure of the internal medium itself, thereby reducing the power equipment for transporting high-temperature steam.

[0037] The control systems in the embodiment are preferably controlled by PLC, and are closed-loop control to reduce manual operation. The first water tank 1 is provided with a first water level sensor 11, and the first heat source pipe 3 is provided with a first water pump 32. The first water pump 32 and the first water level sensor 11 are connected with a first PLC controller 81. The first water level sensor 11 always monitors the water level of the first water tank 1. When the water level of the first water tank 1 is insufficient, the first water pump 32 is controlled by the first PLC controller 81 to increase the hot water flow, so as to supplement the water level of the first water tank 1.

[0038] The second heat source pipe 4 provides heat source for the heat exchange terminal device 6, and is provided with a second water pump 41. The second water pump 41 and the heat exchange terminal device 6 are connected with a second PLC controller 82. The heat exchange terminal device 6 in the embodiment is taken as an example of a mud heat exchanger used in the process of mud atomization heating and granulation. Since the temperature of the hot water in the first water tank 1 is stable, the heat required by the mud heat exchanger can be realized by adjusting the hot water flow. The second heat source pipe 4 controls the hot water flow by the second PLC controller 82 and the second water pump 41, so that the second heat source pipe 4 transports hot water with constant temperature and controllable flow to the mud heat exchanger, thereby ensuring the stable operation of the mud heat exchanger.

[0039] The water outlet end of the heat exchange terminal device 6 is communicated with the second water tank 2 through a first cold water pipe 9 to realize circulation.

[0040] The bottom of the first water tank 1 is provided with a first sewage valve 12, and the bottom of the second water tank 2 is provided with a second sewage valve 24.

[0041] The utility model discloses utilize the cooling section 71 waste heat (saturated hot water) of kiln 7, through first heat source pipe 3 with saturated hot water into first water tank 1, after the bubble breaking of first shunt plate 31, finally send to heat exchange terminal device 6, to improve the mud processing temperature, and send to the liquid temperature constant, flow controllable of heat exchange terminal device 6, the high temperature steam in first water tank 1 is passed into second water tank 2, and after the heat exchange of the medium of second water tank 2, discharges again through exhaust pipe 21, realizes the full use of heat, and the circulating water that passes through heat exchange terminal device 6 enters second water tank 2, forms circulation.

[0042] In conclusion, the utility model has the following beneficial effects:

[0043] 1, the hot water temperature constant that goes to heat exchange terminal device 6, and flow controllable, can guarantee the stability of heat exchange terminal device 6 heat exchange,

[0044] 2, the outlet end of first heat source pipe 3 is equipped with first shunt plate 31 in first water tank 1, can break bubble, promote high temperature steam and high temperature hot water separation, reduce the high temperature steam of second heat source pipe 4 and heat exchange terminal device 6 inflow, improve heat exchange equipment safety,

[0045] 3, third heat source pipe 5 is equipped with second shunt plate 51 in second water tank 2, can break bubble, increase high temperature steam and water heat exchange area, improve heat exchange efficiency,

[0046] 4, the whole system is PLC control, and is closed loop control, and the automation degree is high.

[0047] The above only discloses a preferred embodiment of the utility model, and of course cannot limit the right range of the utility model, therefore the equivalent change made according to the utility model right claim still belongs to the range covered by the utility model.

Claims

1. A kiln waste heat heat exchanging device, characterized in that, The first water tank, the second water tank, the first heat source pipe, the second heat source pipe, the third heat source pipe and the heat exchange terminal device, The first heat source pipe is used for conveying the cooling water of the second water tank to a kiln to form saturated hot water, and conveying the saturated hot water to the first water tank; The second heat source pipe is connected between the water inlet end of the heat exchange terminal device and the first water tank; The top of the second water tank is communicated with the outside, the third heat source pipe is connected between the first water tank and the second water tank, and the outlet end of the third heat source pipe is immersed below the liquid level of the second water tank, so as to convey the high-temperature steam of the first water tank to the second water tank.

2. The kiln waste heat heat exchanging device according to claim 1, characterized in that, At least one of the first heat source pipe and the second heat source pipe is provided with a flow dividing plate immersed in the liquid in the tank at the outlet end.

3. The kiln waste heat heat exchanging device as claimed in claim 2, wherein, The center of the flow dividing plate is provided with a through hole communicated with the first heat source pipe or the second heat source pipe, and a plurality of filter holes are arranged on the flow dividing plate in the circumferential direction of the through hole.

4. The kiln waste heat heat exchanging device as claimed in claim 3, wherein A plurality of array layers formed by the filter holes are arranged on the flow dividing plate, each array layer surrounds the through hole, the diameter of the filter holes of the array layers gradually increases from the center to the edge of the flow dividing plate, and the number of arrays of the array layers gradually increases from the center to the edge of the flow dividing plate.

5. The kiln waste heat heat exchanging device as claimed in claim 1, wherein, The first water tank is closed, and the third heat source pipe is provided with a predetermined distance from the liquid level of the first water tank.

6. The kiln waste heat heat exchanging device as claimed in claim 1, wherein The first water tank is provided with a first water level sensor, the first heat source pipe is provided with a first water pump, and the first water pump and the first water level sensor are connected with a first controller.

7. The kiln waste heat heat exchanging device as claimed in claim 1, wherein, The second heat source pipe is provided with a second water pump, and the second water pump and the heat exchange terminal device are connected with a second controller.

8. The kiln waste heat heat exchanging device as claimed in claim 1, wherein, The water outlet end of the heat exchange terminal device is communicated with the second water tank through a first cold water pipe.

9. The kiln waste heat heat exchanging device as claimed in claim 1, wherein, The second water tank is further provided with a second cold water pipe and a second water level sensor, the second cold water pipe is communicated with an external water source, the second cold water pipe is provided with a solenoid valve, and the solenoid valve and the second water level sensor are connected with a third controller.

10. The kiln waste heat heat exchanging device as claimed in claim 1, wherein, The bottom of the first water tank and the bottom of the second water tank are provided with a blowdown valve.

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