Efficient rotary heat exchange system applied to heat recovery of high-temperature solid materials

Abstract

The utility model discloses an efficient rotary heat exchange system applied to heat recovery of high-temperature solid materials, which comprises a primary rotary heat exchanger and a secondary rotary heat exchanger which are in cascade connection, and a low-temperature molten salt tank is connected onto a primary rotary heat exchanger low-temperature molten salt inlet pipeline of the primary rotary heat exchanger. A high-temperature molten salt tank is connected to a first-stage rotary heat exchanger high-temperature molten salt outlet pipeline of the first-stage rotary heat exchanger, and a molten salt heat exchange mechanism is arranged between the high-temperature molten salt tank and the low-temperature molten salt tank; and demineralized water is connected to a second-stage rotary heat exchanger demineralized water inlet pipeline of the second-stage rotary heat exchanger, a deaerator is connected to a second-stage rotary heat exchanger demineralized water outlet pipeline, and the deaerator is connected with the fused salt heat exchange mechanism to exchange heat with the high-temperature fused salt. The heat recovery system improves the overall waste heat recovery efficiency of the system, can be suitable for the characteristics of physical form irregularity, material supply discontinuity and the like of high-temperature materials, and achieves efficient recovery of heat of the high-temperature solid materials.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature solid material recovery, and more specifically relates to an efficient heat exchange and conversion system applied to the heat recovery of high-temperature solid materials. Background Art

[0002] In the production process links of industries such as metallurgy, electric power, petrochemical, cement, and non-ferrous metals, there are production links where a large amount of high-temperature solid materials need to be cooled.

[0003] Regarding the cooling of high-temperature solid materials, at present, some waste heat recovery measures have been taken in the production process links of some industries to preliminarily recover the heat carried by them, but the recovery efficiency is very low, and the efficient recovery of heat has not been achieved.

[0004] In addition, for the cooling of a large part of high-temperature solid materials, due to many factors such as the irregular physical form of high-temperature solid materials, the non-continuity of materials, and the instability of the material quantity, it is temporarily impossible to effectively recover and utilize the heat carried by them.

[0005] Therefore, it is necessary to develop a heat exchange system and equipment that can efficiently recover the heat of various forms of high-temperature solid materials and realize industrial application, so as to greatly improve the comprehensive energy utilization rate of enterprises and reduce the direct operation cost. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to provide an efficient heat exchange and conversion system applied to the heat recovery of high-temperature solid materials, which can be applicable to the characteristics such as the irregular physical form of high-temperature materials and the non-continuity of material supply, and realize the efficient recovery of the heat of high-temperature solid materials.

[0007] To solve the above technical problems, the technical solutions adopted by the utility model are as follows.

[0008] An efficient heat exchange and conversion system applied to the heat recovery of high-temperature solid materials includes a primary rotary heat exchanger and a secondary rotary heat exchanger connected in cascade for heat recovery of high-temperature materials. A low-temperature molten salt tank is connected to the low-temperature molten salt inlet pipe of the primary rotary heat exchanger of the primary rotary heat exchanger, and a high-temperature molten salt tank is connected to the high-temperature molten salt outlet pipe of the primary rotary heat exchanger of the primary rotary heat exchanger. A molten salt heat exchange mechanism is arranged between the high-temperature molten salt tank and the low-temperature molten salt tank for recovering the heat of the high-temperature molten salt; Demineralized water for heat exchange with high-temperature materials is introduced into the demineralized water inlet pipe of the secondary rotary heat exchanger of the secondary rotary heat exchanger. An deaerator for removing oxygen from the high-temperature demineralized water is connected to the demineralized water outlet pipe of the secondary rotary heat exchanger. The deaerator is connected to the molten salt heat exchange mechanism to perform heat exchange with the high-temperature molten salt.

[0009] Further optimize the technical solution. The molten salt heat exchange mechanism includes a molten salt superheater, a molten salt evaporator, and a molten salt economizer that are sequentially connected to the high-temperature molten salt tank and used for heat exchange with the deaerated water output from the deaerator. The molten salt outlet pipe of the molten salt economizer is connected to the low-temperature molten salt tank, and the deaerated water inlet pipe of the molten salt economizer is connected to the deaerator.

[0010] Further optimize the technical solution. A steam drum for steam-water separation is provided on the deaerated water outlet pipe of the molten salt economizer. The steam drum is connected to the molten salt evaporator through the deaerated water inlet pipe and the deaerated water outlet pipe of the molten salt evaporator. The steam inlet pipe of the molten salt superheater is connected to the steam outlet end of the steam drum.

[0011] Further optimize the technical solution. A high-temperature molten salt pump for sending high-temperature molten salt into the molten salt superheater is provided on the molten salt inlet pipe connecting the high-temperature molten salt tank and the molten salt superheater.

[0012] Further optimize the technical solution. A deaerator water pump for sending high-temperature deaerated water into the molten salt economizer is provided on the deaerated water inlet pipe connecting the deaerator and the molten salt economizer.

[0013] Further optimize the technical solution. A low-temperature molten salt pump for sending low-temperature molten salt in the low-temperature molten salt tank into the first-stage rotary heat exchanger is provided on the low-temperature molten salt inlet pipe of the first-stage rotary heat exchanger.

[0014] Further optimize the technical solution. An auxiliary heater for heating the molten salt in the low-temperature molten salt tank is provided in the low-temperature molten salt tank.

[0015] Due to the adoption of the above technical solutions, the technical progress achieved by the present utility model is as follows.

[0016] An efficient heat recovery system for high-temperature solid materials provided by the present utility model. The high-temperature solid materials enter the first-stage rotary heat exchanger, and the heat of the high-temperature solid materials is efficiently recovered through molten salt, ensuring the safety and stability of the equipment. After being cooled, the high-temperature solid materials enter the second-stage rotary heat exchanger, where they are deeply cooled and the waste heat is recovered through deaerated water, while the makeup water of the heat exchange system is fully preheated, thereby improving the overall waste heat recovery efficiency of the system. It can adapt to the characteristics of irregular physical forms and discontinuous material supply of high-temperature materials, and achieve efficient heat recovery of high-temperature solid materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present utility model.

[0018] Wherein: 1. Primary rotary heat exchanger, 11. Low-temperature molten salt inlet pipe of the primary rotary heat exchanger, 12. Low-temperature molten salt outlet pipe of the primary rotary heat exchanger, 2. Secondary rotary heat exchanger, 21. Demineralized water inlet pipe of the secondary rotary heat exchanger, 22. Demineralized water outlet pipe of the secondary rotary heat exchanger, 3. High-temperature molten salt tank, 31. High-temperature molten salt pump, 4. Molten salt steam superheater, 41. Molten salt inlet pipe of the molten salt steam superheater, 42. Molten salt outlet pipe of the molten salt steam superheater, 5. Molten salt evaporator, 51. Molten salt outlet pipe of the molten salt evaporator, 6. Molten salt economizer, 61. Molten salt outlet pipe of the molten salt economizer, 7. Low-temperature molten salt tank, 71. Low-temperature molten salt pump, 72. Auxiliary heater, 8. Deaerator, 81. Deaerator water pump, 82. Demineralized water inlet pipe of the molten salt economizer, 9. Steam drum, 91. Demineralized water outlet pipe of the molten salt economizer, 92. Demineralized water inlet pipe of the molten salt evaporator, 93. Demineralized water outlet pipe of the molten salt evaporator, 94. Steam inlet pipe of the molten salt steam superheater, 95. Steam outlet pipe of the molten salt steam superheater. Detailed implementation mode

[0019] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] An efficient regenerative heat exchange system applied to the heat recovery of high-temperature solid materials, in combination with Figure 1 As shown, it includes a primary rotary heat exchanger 1 and a secondary rotary heat exchanger 2. The primary rotary heat exchanger 1 and the secondary rotary heat exchanger 2 are connected in a cascaded manner. The inlet end of the primary rotary heat exchanger 1 is used for feeding high-temperature materials, the outlet end of the primary rotary heat exchanger 1 is connected to the inlet end of the secondary rotary heat exchanger 2, and the outlet end of the secondary rotary heat exchanger 2 is the outlet end of low-temperature materials. The low-temperature solid materials coming out of the secondary rotary heat exchanger 2 can be transported to a centralized storage site for storage by mechanical conveying or truck transportation.

[0021] The heat exchange medium of the primary rotary heat exchanger 1 is molten salt. By utilizing the physical property that molten salt is not easily vaporized, while efficiently recovering the heat of high-temperature solid materials, the safety and stability of the equipment can also be ensured. The heat exchange medium of the secondary rotary heat exchanger 2 is demineralized water. While deeply cooling and recovering the waste heat of high-temperature solid materials, the makeup water of the heat exchange system can also be fully preheated, thereby improving the overall waste heat recovery efficiency of the system.

[0022] A low-temperature molten salt tank 7 is connected to the low-temperature molten salt inlet pipe 11 of the primary rotary heat exchanger of the primary rotary heat exchanger 1, and a high-temperature molten salt tank 3 is connected to the high-temperature molten salt outlet pipe 12 of the primary rotary heat exchanger of the primary rotary heat exchanger 1. A molten salt heat exchange mechanism is arranged between the high-temperature molten salt tank 3 and the low-temperature molten salt pipe 7 to recover the heat of the high-temperature molten salt.

[0023] A low-temperature molten salt pump 71 is provided on the low-temperature molten salt inlet pipeline 11 of the first-stage rotary heat exchanger to send the low-temperature molten salt in the low-temperature molten salt tank 7 into the first-stage rotary heat exchanger 1.

[0024] An auxiliary heater 72 is arranged in the low-temperature molten salt tank 7 to heat the molten salt in the low-temperature molten salt tank. When the system is started, the molten salt is melted, and at the same time, the temperature in the low-temperature molten salt tank can be controlled during the operation of the system to prevent the molten salt in the low-temperature molten salt tank from crystallizing due to too low temperature.

[0025] Demineralized water is connected to the demineralized water inlet pipeline 21 of the second-stage rotary heat exchanger 2 of the second-stage rotary heat exchanger to exchange heat with high-temperature materials. A deaerator 8 is connected to the demineralized water outlet pipeline 22 of the second-stage rotary heat exchanger to remove the oxygen in the high-temperature demineralized water. The deaerator 8 is connected to the molten salt heat exchange mechanism to conduct heat exchange between the demineralized water and the molten salt.

[0026] The molten salt heat exchange mechanism includes a molten salt steam superheater 4, a molten salt evaporator 5, and a molten salt economizer 6 that are sequentially connected to the high-temperature molten salt tank 3, and is used to conduct heat exchange with the demineralized water output by the deaerator 8. The molten salt economizer molten salt outlet pipeline 61 of the molten salt economizer 6 is connected to the low-temperature molten salt tank 7.

[0027] The molten salt economizer demineralized water inlet pipeline 82 of the molten salt economizer 6 is connected to the deaerator 8. A steam drum 9 is arranged on the molten salt economizer demineralized water outlet pipeline 91 of the molten salt economizer 6 for steam-water separation. The steam drum 9 is connected to the molten salt evaporator 5 through the molten salt evaporator demineralized water inlet pipeline 92 and the molten salt evaporator demineralized water outlet pipeline 93. The molten salt steam superheater steam inlet pipeline 94 of the molten salt steam superheater 4 is connected to the steam outlet end of the steam drum 9. The molten salt steam superheater steam outlet pipeline 95 of the molten salt steam superheater 4 is used to output high-temperature steam.

[0028] A high-temperature molten salt pump 31 is arranged on the molten salt steam superheater molten salt inlet pipeline 41 connected between the high-temperature molten salt tank 3 and the molten salt steam superheater 4 to send the high-temperature molten salt in the high-temperature molten salt tank into the molten salt steam superheater 4. The molten salt steam superheater molten salt outlet pipeline 42 of the molten salt steam superheater 4 is connected to the molten salt evaporator 5. The molten salt evaporator molten salt outlet pipeline 51 of the molten salt evaporator 5 is connected to the molten salt economizer 6.

[0029] A deaerator water pump 81 is arranged on the molten salt economizer demineralized water inlet pipeline 82 connected between the deaerator 8 and the molten salt economizer 6 to send the high-temperature deaerated water into the molten salt economizer 6.

[0030] The high-temperature solid materials of the present utility model sequentially pass through the primary rotary heat exchanger 1 and the secondary rotary heat exchanger 2. After the molten salt and the demineralized water recover the large amount of heat carried by the high-temperature solid materials in a stepped manner, the high-temperature solid materials are cooled into low-temperature materials.

[0031] When the system is started, the molten salt is added into the low-temperature molten salt tank 7, and the molten salt is melted by the auxiliary heater 72. After the molten salt is completely melted, the low-temperature molten salt pump 71 is started, and the melted low-temperature molten salt is sent to the primary rotary heat exchanger 1 through the low-temperature molten salt inlet pipeline 11 of the primary rotary heat exchanger. After absorbing the heat carried by the high-temperature materials, the high-temperature molten salt is then sent to the high-temperature molten salt tank 3 through the high-temperature molten salt outlet pipeline 12 of the primary rotary heat exchanger; the high-temperature molten salt in the high-temperature molten salt tank 3 is transported out through the high-temperature molten salt pump 31, and sequentially passes through the molten salt superheater 4, the molten salt evaporator 5, and the molten salt economizer 6 and then enters the low-temperature molten salt tank 7.

[0032] The demineralized water enters the secondary rotary heat exchanger 2 through the demineralized water inlet pipeline 21 of the secondary rotary heat exchanger, absorbs the heat carried by the high-temperature materials to preheat the demineralized water, and then is sent to the deaerator 8 through the demineralized water outlet pipeline 22 of the secondary rotary heat exchanger; the deaerator 8 deaerates the demineralized water, and then sends it to the molten salt economizer 6 through the deaerator water pump 81 to further heat the demineralized water by absorbing the heat of the high-temperature molten salt; then it is sent to the steam drum 9 through the demineralized water outlet pipeline 91 of the molten salt economizer; the water in the steam drum is connected to the molten salt evaporator 5 through the demineralized water inlet pipeline 92 of the molten salt evaporator, absorbs the heat of the high-temperature molten salt in the molten salt evaporator 5 and then is sent back to the steam drum 9 through the demineralized water outlet pipeline 93 of the molten salt evaporator; the steam in the steam drum 9 is sent to the molten salt superheater 4 through the steam inlet pipeline 94 of the molten salt superheater, the steam absorbs the heat of the high-temperature molten salt to generate superheated steam, and then is sent to the subsequent steam-using equipment through the steam outlet pipeline 95 of the molten salt superheater.

Claims

1. An efficient heat exchange and conversion system applied to heat recovery of high-temperature solid materials, characterized in that: It includes a first-stage rotary heat exchanger (1) and a second-stage rotary heat exchanger (2) connected in cascade for heat recovery of high-temperature materials. A low-temperature molten salt tank (7) is connected to the first-stage rotary heat exchanger low-temperature molten salt inlet pipe (11) of the first-stage rotary heat exchanger (1). A high-temperature molten salt tank (3) is connected to the first-stage rotary heat exchanger high-temperature molten salt outlet pipe (12) of the first-stage rotary heat exchanger (1). A molten salt heat exchange mechanism for heat recovery of high-temperature molten salt is arranged between the high-temperature molten salt tank (3) and the low-temperature molten salt tank (7); Demineralized water for heat exchange of high-temperature materials is introduced into the second-stage rotary heat exchanger demineralized water inlet pipe (21) of the second-stage rotary heat exchanger (2). A deaerator (8) for removing oxygen from high-temperature demineralized water is connected to the second-stage rotary heat exchanger demineralized water outlet pipe (22). The deaerator (8) is connected to the molten salt heat exchange mechanism to perform heat exchange with high-temperature molten salt.

2. The high-efficiency heat exchange system for heat recovery of high-temperature solid materials according to claim 1, wherein: The molten salt heat exchange mechanism includes a molten salt superheater (4), a molten salt evaporator (5), and a molten salt economizer (6) that are sequentially connected to the high-temperature molten salt tank (3) and used for heat exchange with the demineralized water output from the deaerator. The molten salt economizer molten salt outlet pipe (61) of the molten salt economizer (6) is connected to the low-temperature molten salt tank (7). The molten salt economizer demineralized water inlet pipe (82) of the molten salt economizer (6) is connected to the deaerator (8).

3. The high-efficiency heat exchange system for heat recovery of high-temperature solid materials according to claim 2, characterized in that: A steam drum (9) for steam-water separation is arranged on the molten salt economizer demineralized water outlet pipe (91) of the molten salt economizer (6). The steam drum (9) is connected to the molten salt evaporator (5) through the molten salt evaporator demineralized water inlet pipe (92) and the molten salt evaporator demineralized water outlet pipe (93). The molten salt superheater steam inlet pipe (94) of the molten salt superheater (4) is connected to the steam outlet end of the steam drum (9).

4. The high-efficiency heat exchange system for heat recovery of high-temperature solid materials according to claim 2, characterized in that: A high-temperature molten salt pump (31) for sending high-temperature molten salt into the molten salt superheater (4) is arranged on the molten salt superheater molten salt inlet pipe (41) connected between the high-temperature molten salt tank (3) and the molten salt superheater (4).

5. The high-efficiency heat exchange system for heat recovery of high-temperature solid materials according to claim 2, characterized in that: A deaerator water pump (81) for sending high-temperature deaerated water into the molten salt economizer (6) is arranged on the molten salt economizer demineralized water inlet pipe (82) connected between the deaerator (8) and the molten salt economizer (6).

6. The high-efficiency heat exchange system for heat recovery of high-temperature solid materials according to claim 1, wherein: A low-temperature molten salt pump (71) for sending low-temperature molten salt in the low-temperature molten salt tank (7) into the first-stage rotary heat exchanger (1) is arranged on the first-stage rotary heat exchanger low-temperature molten salt inlet pipe (11).

7. The high-efficiency heat exchange and conversion system applied to heat recovery of high-temperature solid materials according to claim 1, wherein: An auxiliary heater (72) for heating the molten salt in the low-temperature molten salt tank is arranged in the low-temperature molten salt tank (7).

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