Integrated evaporator with controllable evaporation medium temperature

Abstract

The utility model relates to the technical field of evaporators, in particular to an integrated evaporator with controllable evaporation medium temperature, which comprises a cylindrical barrel and a shell formed by end sockets at two ends, the interior of the shell is divided into a gas phase space and a liquid phase space from top to bottom and is provided with a preheating tube bundle and an evaporation tube bundle, and a liquid baffle is arranged in the shell. The liquid baffle is arranged between a water outlet of the cold water conveying pipeline and a heat medium outlet of the evaporation tube bundle in the axial direction, the end of the liquid baffle is attached to the barrel to divide the liquid phase space into a temperature adjusting space and an evaporation space, and the cold water conveying pipeline is communicated with the interior of the temperature adjusting space from the outside of the barrel. And a water outlet of the preheating tube bundle is also communicated into the temperature adjusting space range through a hot water conveying pipeline. The technical problems that in the prior art, an evaporator is low in heat exchange efficiency and large in power consumption at the initial operation stage and during low-load operation are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, in particular to an integrated evaporator capable of adjusting the temperature of an evaporating medium. Background Art

[0002] In the prior art, when valley electricity is used to heat molten salt for heat storage, and then molten salt is used to exchange heat with water to generate steam for industrial heating, the temperature difference between the inlet and outlet of the molten salt in the evaporator is generally large. Conventional evaporation systems often require the installation of preheaters, evaporators, steam drums, and superheaters to achieve the function of heating and evaporating normal temperature water into superheated steam. The system has many devices, a complex system, a large footprint, and a large investment. It also requires many heating devices and pipelines, and has a high operating cost. In some special application scenarios, if the outlet temperature of the evaporator heat medium is too low, it will cause risks such as solidification and equipment dew point corrosion.

[0003] The utility model with application number CN202222311509.0 discloses a combined evaporator that can be used for molten salt heat storage to produce low and medium pressure steam and an evaporation system containing the evaporator. The shell of the combined evaporator is provided with gas phase space and liquid phase space distributed up and down. The gas phase space is provided with a preheating tube bundle that uses gas phase space steam to preheat the accumulated water in the liquid phase space. The liquid phase space is not provided with an evaporation tube bundle to heat the liquid phase space water supply. An overheating tube bundle is also arranged between the gas phase space and the steam outlet of the evaporator to heat the steam. A circulating heating pipe is provided at the bottom of the shell to heat the water supply of the liquid phase space during the startup phase. The evaporation system includes the above-mentioned combined evaporator, a high-temperature molten salt tank, a low-temperature molten salt tank, a starting electric heater and a starting circulating pump. The outlet of the high-temperature molten salt tank is respectively connected to the outlet end of the overheating tube bundle and the evaporation tube bundle. In the initial use of the evaporator and under low load conditions, due to the large margin of the preheating tube bundle area, the evaporation medium temperature at the outlet of the preheating tube bundle is high, resulting in reduced heat exchange efficiency of the evaporator, increased demand for heat medium flow, and increased power consumption. Utility Model Content

[0004] In order to mainly solve the technical problems of low heat exchange efficiency and high power consumption in the initial stage of evaporator operation and low load operation in the prior art, the utility model proposes an integrated evaporator with controllable evaporation medium temperature.

[0005] An integrated evaporator with controllable evaporation medium temperature comprises a shell formed by a cylinder and heads at both ends, the interior of the shell is divided into a gas phase space and a liquid phase space from top to bottom, and is provided with a preheating tube bundle and an evaporation tube bundle, the preheating tube bundle is arranged at the top of the gas phase space, and uses the high-temperature steam in the gas phase space to preheat the evaporation medium in the pipeline, the evaporation tube bundle is arranged at the bottom of the liquid phase space, and is used for heat exchange between the heat medium and the evaporation medium, a liquid baffle is arranged in the shell, the liquid baffle is axially arranged between the water outlet of the cold water delivery pipeline and the heat medium outlet of the evaporation tube bundle, the end of the liquid baffle is fitted with the cylinder to divide the liquid phase space into a temperature adjustment space and an evaporation space, so that cold and hot water can flow to the evaporation tube bundle and can be fully mixed at the same time, a cold water delivery pipeline is connected from the outside of the cylinder to the temperature adjustment space, and the water outlet of the preheating tube bundle is also connected to the temperature adjustment space through the hot water delivery pipeline.

[0006] The height of the above-mentioned liquid baffle is set to be no lower than the liquid level of the evaporator, and a plurality of flow holes are provided at the bottom, so that the cold and hot water can be fully mixed and flow to the evaporation space through the flow holes, and it is ensured that when the flow holes are blocked, the mixed cold and hot water can still flow from the top of the liquid baffle to the evaporation tube bundle to avoid accidents.

[0007] A hot water distributor is provided at the water outlet of the hot water delivery pipe, and a cold water distributor is provided at the water outlet of the cold water delivery pipe, and the water outlets of the hot water distributor and the cold water distributor are arranged opposite to each other. The hot water distributor and the cold water distributor are both one or more pipes with small holes, which can evenly spray cold water or hot water into the temperature control space, so that the cold water and hot water are mixed more evenly.

[0008] The above-mentioned evaporation tube bundle includes a first inlet header, a first serpentine tube bundle, a first support plate, and a first outlet header. The first inlet header and the first outlet header both have openings downwardly passing through the through cylinder and are welded to the cylinder. The first serpentine tube bundle is welded between the first inlet header and the first outlet header, and the first serpentine tube bundle is supported by the first support plate; the preheating tube bundle includes a second inlet header, a second serpentine tube bundle, a second support plate, and a second outlet header. The second inlet header and the second outlet header both have openings upwardly passing through the cylinder and are welded thereto. The second serpentine tube bundle is welded between the second inlet header and the second outlet header and is supported by the second support plate. Both ends of the second outlet header are closed, but the end located outside the cylinder is connected by a flange and a flange cover, and the bottom of the second outlet header is connected to the hot water delivery pipeline.

[0009] The beneficial effects of the utility model include: by arranging a liquid baffle between the water outlet of the cold water delivery pipe and the heat medium outlet of the evaporation tube bundle, the cold and hot water can be fully mixed on one side of the liquid baffle before flowing to the evaporation tube bundle, thereby solving the technical problems of low heat exchange efficiency and high power consumption in the initial stage of evaporator operation and low load operation in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural cross-sectional view of an integrated evaporator with controllable evaporation medium temperature according to the utility model.

[0011] Figure 2 This is a front view of the liquid baffle plate of Example 2 of the integrated evaporator with controllable evaporation medium temperature of the utility model.

[0012] Figure 3 The utility model is a side view of the liquid baffle plate of the integrated evaporator with controllable evaporation medium temperature.

[0013] Figure 4 The utility model is a schematic diagram of a heat exchange system of an integrated evaporator with controllable evaporation medium temperature.

[0014] Markings in the figure are: 1-cylinder, 2-head, 3-preheating tube bundle, 4-evaporation tube bundle, 5-liquid baffle, 51-flow hole, 6-cold water delivery pipeline, 61-cold water distributor, 7-hot water delivery pipeline, 71-hot water distributor. DETAILED DESCRIPTION

[0015] The utility model is described below in conjunction with the accompanying drawings.

[0016] Embodiment 1:

[0017] like Figure 1 As shown, this embodiment provides an integrated evaporator with controllable evaporation medium temperature, including a shell formed by a cylinder 1 and end caps 2 at both ends, the interior of the shell is divided into a gas phase space and a liquid phase space from top to bottom, the heat exchange in the evaporator is mainly carried out by heat exchange between the gas phase space and the liquid phase space, and a preheating tube bundle 3 and an evaporation tube bundle 4 are provided, the evaporation tube bundle 4 is provided at the bottom of the liquid phase space, the evaporation medium mainly exchanges heat with the heat medium through the evaporation tube bundle 4, and at the same time, the gaseous evaporation medium carrying heat in the gas phase space can preheat the evaporation medium in the preheating tube bundle 3 in a cooling state, In addition, a liquid baffle 5 is provided in the shell, wherein the liquid baffle 5 is axially arranged between the water outlet of the cold water delivery pipe 6 and the heat medium outlet of the evaporation tube bundle 4 and the end portion is in contact with the cylinder 1. The liquid baffle 5 divides the liquid phase space into a temperature control space and an evaporation space, so that cold and hot water can be fully mixed in the temperature control space and flow to the evaporation space while being maintained at a certain temperature. The cold water delivery pipe 6 is connected from the outside of the cylinder 1 to the liquid phase space, and the water outlet of the preheating tube bundle 3 is also connected to the temperature control space through the hot water delivery pipe 7 to ensure that the cold and hot evaporation media can be fully mixed.

[0018] Furthermore, a hot water distributor 71 is provided at the water outlet of the hot water delivery pipe 7, and a cold water distributor 61 is provided at the water outlet of the cold water delivery pipe 6, and the water outlets of the hot water distributor 71 and the cold water distributor 61 are arranged opposite to each other. The hot water distributor 71 and the cold water distributor 61 are both one or more pipes with small holes, which can evenly spray the cold and hot evaporating media into the temperature control space so that the cold and hot evaporating media are fully mixed. By adjusting the flow rates of the two water supply lines, the temperature of the evaporating medium can be maintained within a controllable range.

[0019] Furthermore, the evaporation tube bundle 4 includes a first inlet header 41, a first serpentine tube bundle 42, a first support plate 43, and a first outlet header 44. The first inlet header 41 and the first outlet header 44 are both opened downward through the cylinder 1 and welded thereto. The first serpentine tube bundle 42 is welded between the first inlet header 41 and the first outlet header 44, and the first serpentine tube bundle 42 is supported by the first support plate 43. The heat medium enters from the first inlet header 41 and finally flows out from the first outlet header 44, so that sufficient heat exchange can be performed between the heat medium and the evaporation medium, while preventing the inlet heat medium temperature from being too low to cause the outlet The preheating tube bundle 3 includes a second inlet header 31, a second serpentine tube bundle 32, a second support plate 33, and a second outlet header 34. The second inlet header 31 and the second outlet header 34 are both opened upward through the cylinder 1 and are welded thereto. The second serpentine tube bundle 32 is welded between the second inlet header 31 and the second outlet header 34 and is supported by the second support plate 33. Both ends of the second outlet header 34 are closed, but one end located outside the cylinder 1 is connected by a flange and a flange cover. The bottom of the second outlet header 34 is connected to the hot water delivery pipeline 7, so that the evaporation medium can be fully preheated while flowing in the preheating tube bundle 3.

[0020] When the utility model is put into use, during the operation of the equipment, the heat medium circulates in the equipment through the evaporation tube bundle 4, and the evaporation medium circulates in the equipment through the preheating tube bundle 3, so as to realize the heat exchange between the heat medium and the evaporation medium, specifically: the heat medium enters the first serpentine tube bundle 42 through the first inlet header 41, and then flows out through the first outlet header 44, and the evaporation medium in a cooled state, specifically cold water, enters the cylinder from outside the cylinder through two pipes, enters the second serpentine tube bundle 32 through the second inlet header 31, and is preheated by the gaseous evaporation medium carrying heat in the gas phase space, and is heated to hot water, and then flows to the hot water through the second outlet header 34. The hot water is sprayed to the temperature control space through the hot water delivery pipeline 7 through the hot water distributor 71; the other way flows to the cold water distributor 61 through the cold water delivery pipeline 6 and is sprayed to the temperature control space. The cold water and hot water sprayed by the hot water distributor 71 and the cold water distributor 61, which are relatively located, are initially mixed and accumulated on the left side of the liquid baffle 5 as shown in the figure. After accumulating to the height of the liquid baffle 5, the excess evaporation medium will pass over the liquid baffle 5 and flow to the evaporation tube bundle 4. After heat exchange with the heat medium in the evaporation tube bundle 4, it evaporates into gaseous high-temperature water vapor. After preheating the evaporation medium in the preheating tube bundle 3, it is discharged from the equipment through the steam outlet pipe, completing the heat exchange between the heat medium and the evaporation medium.

[0021] Embodiment 2:

[0022] like Figure 1-3 As shown, this embodiment provides an integrated evaporator with controllable evaporation medium temperature, wherein the height of the liquid baffle 5 is set to be no lower than the evaporator liquid level, and a plurality of flow holes 51 are provided at the bottom, so that the cooling state and the preheated evaporation medium can be fully mixed and then flow to the evaporation space through the flow holes 51.

[0023] The rest is the same as Example 1.

[0024] When the utility model is put into use, the cooling state and the preheated evaporation medium are collected on the left side of the liquid baffle plate 5 as shown in the figure after the process described in Example 1, and after being fully mixed, they flow to the evaporation tube bundle 4 through the multiple flow holes at the bottom of the liquid baffle plate 5 to exchange heat with the heat medium. The whole process is more stable than the heat exchange process described in Example 1; when the flow hole 51 is blocked due to an accident or other faults, the accumulated evaporation medium can still flow to the evaporation tube bundle 4 through the opening at the top of the liquid baffle plate 5, which can reduce the probability of accidents.

[0025] Compared with the prior art, the integrated evaporator with controllable evaporation medium temperature proposed in the utility model has the following advantages: by arranging a liquid baffle, a hot water distributor and a cold water distributor on one side of the evaporation medium in the liquid phase space in the evaporator, the evaporation medium can be preheated while the evaporation medium in the cooled state can be fully mixed with the preheated evaporation medium to ensure that their temperatures are stabilized at a more appropriate value, and the flow rates of the two evaporation media can be adjusted to achieve control of the temperature of the mixed evaporation medium, thereby solving the technical problems of low heat exchange efficiency and high power consumption in the initial stage of operation and low-load operation of the evaporator in the prior art.

Claims

1. An integrated evaporator with controllable evaporation medium temperature, comprising a shell formed by a cylinder (1) and end caps (2) at both ends, wherein the interior of the shell is divided into a gas phase space and a liquid phase space, and is provided with a preheating tube bundle (3) and an evaporation tube bundle (4), wherein the preheating tube bundle (3) is arranged at the top of the gas phase space, and the evaporation tube bundle (4) is arranged at the bottom of the liquid phase space, and is characterized in that: A liquid baffle (5) is arranged in the shell, a cold water delivery pipe (6) is connected from the outside of the cylinder (1) to the temperature control space, and the water outlet of the preheating tube bundle (3) is also connected to the temperature control space through a hot water delivery pipe (7). The liquid baffle (5) is axially arranged between the water outlet of the cold water delivery pipe (6) and the heat medium outlet of the evaporation tube bundle (4), and the end of the liquid baffle (5) is in contact with the cylinder (1) to divide the liquid phase space into a temperature control space and an evaporation space.

2. The integrated evaporator with controllable evaporation medium temperature according to claim 1, characterized in that: The height of the liquid baffle plate (5) is set to be no lower than the liquid level of the evaporator, and a plurality of flow holes (51) are arranged at the bottom.

3. The integrated evaporator with controllable evaporation medium temperature according to claim 1, characterized in that: A hot water distributor (71) is provided at the water outlet of the hot water delivery pipe (7), and a cold water distributor (61) is provided at the water outlet of the cold water delivery pipe (6), and the water outlets of the hot water distributor (71) and the cold water distributor (61) are arranged opposite to each other, and the hot water distributor (71) and the cold water distributor (61) are both one or more pipes with small holes.

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