Contact-type photo-thermal steam generation system with heat transfer oil for heat transfer and solid heat storage
By using direct contact between thermal oil and solid heat storage medium in the photothermal steam generation system, the high cost of thermal oil and molten salt and freezing problems are solved, the heat storage capacity and heat exchange efficiency are improved, the system structure is simplified, and the system is reduced The cost.
Patent Information
- Application Number
- CN202420887911.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In the existing photothermal heating technology, the high cost of thermal conductivity oil and molten salts and the problems of freezing and decomposition, as well as the high cost and complexity caused by low heat transfer coefficient in solid heat storage mode.
Design a contact thermal oil heat transfer solid heat storage photothermal steam generation system. Through direct and sufficient contact between thermal oil and solid heat storage medium, steel pipes and fins are reduced, and thermal oil buffer tanks, heat collection fields, and heat storage are used. Components such as modules, evaporators and preheaters realize efficient storage and transfer of heat.
It reduces the overall system cost, avoids the risk of molten salt freezing, improves heat storage capacity and heat exchange efficiency, and simplifies the system structure.
Smart Images
Figure CN222210275U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a photothermal steam generating system with contact-type heat-conducting oil heat transfer and solid heat storage. Background Art
[0002] The current mainstream solar thermal heating technology uses heat transfer oil or molten salt for heat storage. Due to the high prices of heat transfer oil and molten salt, the economic benefits are poor. At the same time, molten salt will also cause low-temperature freezing and high-temperature decomposition problems. To solve this problem, electric heating and temperature monitoring measures are required, which increases the complexity and cost of the system. In the conventional solid heat storage mode, due to the low heat transfer coefficient of the heat storage medium, in order to improve the heat exchange efficiency, the surface area of the steel pipe must be increased, or the heat transfer fins must be added. However, this measure will greatly increase the amount of steel pipes used in the heat storage module, which will increase a lot of costs. Utility Model Content
[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a photothermal steam generation system with a contact-type heat transfer oil and solid heat storage having a reasonably designed structure, which is simple in system, reduces the overall cost and avoids the risk of molten salt freezing and blocking.
[0004] The technical solution adopted by the utility model to solve the above-mentioned problems is: a contact-type thermal oil heat transfer and solid heat storage photothermal steam generating system, characterized in that: it includes a thermal collecting field, a heat storage module, a thermal oil buffer tank, an evaporator, a preheater, a deaerator, a thermal oil pipeline in front of the evaporator and an external steam supply pipeline; the outlet of the thermal oil buffer tank is connected to the inlet of the thermal collecting field; the outlet of the thermal collecting field is connected to the inlet of the heat storage module and the thermal oil pipeline in front of the evaporator; the outlet of the heat storage module is connected to the inlet of the thermal oil buffer tank; the thermal oil pipeline in front of the evaporator is connected to the hot phase inlet of the evaporator, the hot phase outlet of the evaporator is connected to the hot phase inlet of the preheater, and the hot phase outlet of the preheater is connected to the inlet of the thermal oil buffer tank; the outlet of the deaerator is connected to the cold phase inlet of the preheater, the cold phase outlet of the preheater is connected to the cold phase inlet of the evaporator, and the cold phase outlet of the evaporator is connected to the external steam supply pipeline and the steam inlet of the deaerator.
[0005] The utility model provides a heat-conducting oil pump and a heat-conducting oil valve installed on the outlet of the heat-conducting oil buffer tank.
[0006] The outlet of the heat transfer oil buffer tank described in the utility model is connected to the inlet of the heat collection field through a cold oil pipeline, and the outlet of the heat storage module is connected to the inlet of the heat transfer oil buffer tank through the heat transfer oil pipeline after heat storage; it also includes a heat transfer oil bypass pipeline, one end of the heat transfer oil bypass pipeline is connected to the heat transfer oil pipeline after heat storage, and the other end is connected to the cold oil pipeline.
[0007] The utility model has a second heat transfer oil valve installed on the inlet of the heat collection field, and a third heat transfer oil valve installed on the outlet.
[0008] The utility model has a heat transfer oil valve four installed on the inlet of the heat storage module, and a heat transfer oil valve five installed on the outlet.
[0009] The utility model has a regulating valve installed on the heat-conducting oil pipeline in front of the evaporator.
[0010] In the utility model, a heat transfer oil valve six is installed on the heat transfer oil pipeline after heat storage, and a heat transfer oil valve seven is installed on the heat transfer oil bypass pipeline.
[0011] The outlet of the deaerator of the utility model is connected with the cold phase inlet of the preheater through a water supply pipeline, and a water supply pump is installed on the water supply pipeline.
[0012] The utility model has a steam valve and a steam regulating valve installed on the steam inlet of the deaerator.
[0013] In the utility model, a steam valve 2 is installed on the external steam supply pipeline 30 .
[0014] Compared with the prior art, the utility model has the following advantages and effects:
[0015] (1) The heat transfer oil and solid heat storage medium are in direct and full contact, which greatly reduces the steel pipes and fins in the traditional solid heat storage module and reduces the overall cost of the heat storage module;
[0016] (2) The direct and full contact between the heat transfer oil and the solid module reduces the end difference between the heat transfer oil and the solid heat storage medium, and increases the heat storage capacity of the heat storage module;
[0017] (3) Compared with molten salt heat storage, the system is simple, saves investment, and avoids the risk of molten salt freezing. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION
[0019] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.
[0020] The embodiment of the utility model includes a solar collector 01, a heat storage module 02, a thermal oil buffer tank 03, a thermal oil pump 04, an evaporator 05, a preheater 06, a deaerator 07, a water supply pump 08, a thermal oil valve 1 09, a cold oil pipeline 10, a thermal oil valve 2 11, a thermal oil valve 3 12, a hot oil pipeline 13, a thermal oil valve 4 14, a thermal oil valve 5 15, a thermal oil pipeline after heat storage 16, a thermal oil valve 6 17, a thermal oil valve 7 18, a regulating valve 19, a thermal oil pipeline 20 before the evaporator, a thermal oil pipeline 21 after the evaporator, a thermal oil pipeline 22 after the preheater, a cold desalted water pipeline 23, a water supply pipeline 24, a saturated water pipeline 25, a saturated steam pipeline 26, a steam valve 1 27, a steam regulating valve 28, a steam valve 29, an external steam pipeline 30 and a thermal oil bypass pipeline 31.
[0021] A thermal oil pump 04 and a thermal oil valve 1 09 are installed at the outlet of the thermal oil buffer tank 03, and the outlet of the thermal oil buffer tank 03 is connected to the inlet of the solar collector field 01 through a cold oil pipeline 10; a thermal oil valve 2 11 is installed at the inlet of the solar collector field 01, and a thermal oil valve 3 12 is installed at the outlet.
[0022] A thermal oil valve 14 is installed on the inlet of the heat storage module 02, and a thermal oil valve 15 is installed on the outlet; the outlet of the thermal collecting field 01 is connected with the inlet of the heat storage module 02 and the thermal oil pipeline 20 before the evaporator through the hot oil pipeline 13, and a regulating valve 19 is installed on the thermal oil pipeline 20 before the evaporator; the outlet of the heat storage module 02 is connected with the inlet of the thermal oil buffer tank 03 through the thermal oil pipeline 16 after heat storage, and a thermal oil valve 6 17 is installed on the thermal oil pipeline 16 after heat storage; one end of the thermal oil bypass pipeline 31 is connected to the thermal oil pipeline 16 after heat storage, and the other end is connected to the cold oil pipeline 10, and a thermal oil valve 7 18 is installed on the thermal oil bypass pipeline 31.
[0023] The heat transfer oil pipeline 20 before the evaporator is connected to the hot phase inlet of the evaporator 05, the hot phase outlet of the evaporator 05 is connected to the hot phase inlet of the preheater 06 through the heat transfer oil pipeline 21 after the evaporator, and the hot phase outlet of the preheater 06 is connected to the inlet of the heat transfer oil buffer tank 03 through the heat transfer oil pipeline 22 after the preheater.
[0024] The outlet of the deaerator 07 is connected to the cold phase inlet of the preheater 06 through the water supply pipe 24, on which a water supply pump 08 is installed. The cold phase outlet of the preheater 06 is connected to the cold phase inlet of the evaporator 05 through the saturated water pipe 25, and the cold phase outlet of the evaporator 05 is connected to the external steam supply pipe 30 and the steam inlet of the deaerator 07 through the saturated steam pipe 26. A steam valve 1 27 and a steam regulating valve 28 are installed on the steam inlet of the deaerator 07; a steam valve 2 29 is installed on the external steam supply pipe 30. The water inlet of the deaerator 07 is connected to the cold desalted water pipe 23.
[0025] The heat storage module 02 is provided with a heat storage channel inside. When the heat transfer oil flows through the heat storage module 02, the heat transfer oil is fully in contact with the heat storage medium. The heat transfer oil pump 04 is variable frequency, and the heat transfer oil pump flow is adjusted by controlling the hot oil temperature at the outlet of the heat collection field. The outlet of the evaporator 05 is saturated steam, and the feed water temperature in the deaerator is controlled by the steam regulating valve 28. The heat collection form of the heat collection field 01 can be a trough type or a linear Fresnel type.
[0026] This embodiment is only provided with one set of thermal oil pumps 04, which is 50% less than the traditional system. The heat storage and heat release process of the system can be realized by switching the thermal oil valve at the outlet of the pump group.
[0027] In this embodiment, the system collects heat during the day, and stores the heat in the heat storage module by adjusting and switching the regulating valve 19 and the thermal oil valve 4 14, and can also provide heat to the outside. In this embodiment, the system provides heat to the outside at night by closing the thermal oil valve 2 11, closing the thermal oil valve 6 17, opening the thermal oil valve 5 15, and opening the thermal oil valve 7 18.
[0028] The utility model uses heat transfer oil to absorb heat. During the heat storage process, the heat transfer oil flows through the heat storage medium. The heat transfer oil and the heat storage medium are in direct and full contact, and the heat is better transferred to the heat storage module. The system only needs to set up a heat transfer oil buffer tank to store a small amount of heat transfer oil for heat absorption. When releasing heat, the valve pipeline at the outlet of the heat transfer oil pump is switched to make the heat transfer oil flow through the heat storage module in reverse. After the heat transfer oil is fully heated, it is sent to the steam-water heat exchange system to achieve the output of saturated steam. The specific operation method is as follows:
[0029] When there is sunlight, the thermal oil pump 04 is used to transport the thermal oil in the thermal oil buffer tank 03 to the heat collecting field 01 for heat absorption. The hot thermal oil after heat absorption is sent to the evaporator 05 and the heat storage module 02 through the hot oil pipeline 13. At this time, the thermal oil valve 18 is closed. The frequency conversion of the thermal oil pump 04 controls the thermal oil flow to ensure that the hot oil outlet reaches the design temperature; the regulating capacity of the regulating valve 19 is used to control the saturated steam flow output to the outside and the heat storage amount. The thermal oil flows through the thermal oil pipeline 20 before the evaporator, and the heat is exchanged for saturated water in the evaporator 05, so that the evaporator produces saturated steam. The thermal oil after primary cooling passes through the thermal oil pipeline 21 after the evaporator and enters the preheater 06 for secondary cooling, and is returned to the thermal oil buffer tank 03 through the thermal oil pipeline 22 after the preheater to achieve circulation. The other path of heat transfer oil passes through the opened heat transfer oil valve four 14 to store the heat in the heat storage module 2. After the heat transfer oil is cooled, it is returned to the heat transfer oil buffer tank 03 through the heat transfer oil valve five 15 and the heat transfer oil valve six 17 to realize circulation.
[0030] At night or in the absence of light, if saturated steam needs to be generated, close the thermal oil valve two 11 and the thermal oil valve six 17, open the thermal oil valve seven 18 and the thermal oil valve five 15, and send the thermal oil to the heat storage module 02 through the thermal oil bypass pipe 31 to absorb heat. After absorbing heat, the hot oil pipeline passes through the evaporator 05 and the preheater 06 for heat exchange, and then circulates to the thermal oil buffer tank 03 through the thermal oil pipeline after the preheater to realize the heat release cycle.
[0031] The operation of the steam-water measurement system is described as follows: cold desalted water is sent to the deaerator 07, saturated steam is sent to the deaerator through steam valve 1 27 and steam regulating valve 28 to heat and deoxygenate the feed water, and the feed water is sent to the preheater 06 and evaporator 05 after the pressure is increased by the feed water pump 08, absorbs heat, generates saturated steam, and realizes external heat supply through steam valve 2 29.
[0032] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.
Claims
1. A contact-type thermal oil heat transfer solid heat storage photothermal steam generation system, characterized by: It includes a solar collector field, a heat storage module, a heat transfer oil buffer tank, an evaporator, a preheater, a deaerator, a heat transfer oil pipeline in front of the evaporator and an external steam supply pipeline; the outlet of the heat transfer oil buffer tank is connected to the inlet of the solar collector field; the outlet of the solar collector field is connected to the inlet of the heat storage module and the heat transfer oil pipeline in front of the evaporator; the outlet of the heat storage module is connected to the inlet of the heat transfer oil buffer tank; the heat transfer oil pipeline in front of the evaporator is connected to the hot phase inlet of the evaporator, the hot phase outlet of the evaporator is connected to the hot phase inlet of the preheater, and the hot phase outlet of the preheater is connected to the inlet of the heat transfer oil buffer tank; the outlet of the deaerator is connected to the cold phase inlet of the preheater, the cold phase outlet of the preheater is connected to the cold phase inlet of the evaporator, and the cold phase outlet of the evaporator is connected to the external steam supply pipeline and the steam inlet of the deaerator.
2. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: A heat transfer oil pump and a heat transfer oil valve are installed at the outlet of the heat transfer oil buffer tank.
3. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: The outlet of the heat transfer oil buffer tank is connected to the inlet of the heat collection field through a cold oil pipeline, and the outlet of the heat storage module is connected to the inlet of the heat transfer oil buffer tank through the heat transfer oil pipeline after heat storage; it also includes a heat transfer oil bypass pipeline, one end of the heat transfer oil bypass pipeline is connected to the heat transfer oil pipeline after heat storage, and the other end is connected to the cold oil pipeline.
4. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: A second heat transfer oil valve is installed at the inlet of the solar collector field, and a third heat transfer oil valve is installed at the outlet.
5. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: A heat transfer oil valve four is installed on the inlet of the heat storage module, and a heat transfer oil valve five is installed on the outlet.
6. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: A regulating valve is installed on the heat transfer oil pipeline before the evaporator.
7. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 3 is characterized by: A heat transfer oil valve 6 is installed on the heat transfer oil pipeline after heat storage, and a heat transfer oil valve 7 is installed on the heat transfer oil bypass pipeline.
8. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: The outlet of the deaerator is connected to the cold phase inlet of the preheater through a water supply pipe, and a water supply pump is installed on the water supply pipe.
9. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: A steam valve 1 and a steam regulating valve are installed on the steam inlet of the deaerator.
10. The contact-type heat transfer oil and solid heat storage photothermal steam generation system according to claim 1 is characterized in that: A steam valve 2 is installed on the external steam supply pipeline.