Steam supply heat storage system capable of circularly preheating

Abstract

The utility model discloses a steam supply heat storage system capable of circularly preheating, which comprises a water supply unit, a steam pocket unit, a steam supply unit and a heat storage unit, the heat storage unit comprises a heat storage module and a water jacket coated outside the heat storage module, and the water outlet end I of the water supply unit is communicated with the water inlet end of the steam pocket unit through a water supply pipeline; a water outlet end II of the water supply unit is communicated with a water inlet end of a water jacket of the heat storage unit through a water supply pipeline, and a water outlet end of the water jacket is communicated with a water inlet end I of the water supply unit to form a preheated water circulation loop; the water outlet end of the steam pocket unit is communicated with the heat exchange inlet end of the heat storage unit, and the heat exchange outlet end of the heat storage unit is communicated with the steam-liquid mixing inlet end of the steam pocket unit to form a steam supply heat circulation loop; a steam outlet port of the steam pocket unit communicates with the steam inlet end of the steam supply unit and is used for providing hot steam. The waste heat recovery device not only can realize waste heat recovery and improve the energy utilization efficiency, but also can prolong the service life of equipment and reduce the maintenance cost.

Description

Technical Field

[0001] The utility model relates to the technical field of heat storage, in particular to a steam supply and heat storage system capable of cyclic preheating. Background Art

[0002] Solid thermal storage electric boiler uses low-peak electricity at night (23:00-7:00, a total of 8 hours) to heat the heat storage medium to 800 degrees to store heat, and releases the heat on demand through the automatic control device during peak hours to achieve the effect of shifting peaks and filling valleys to reduce heating costs. It is widely used in residential buildings, office buildings, hotels, hospitals, schools, shopping malls, airports, stations, service areas, factories, farms, greenhouses and other places, and can provide them with the required heat energy.

[0003] However, while thermal storage electric boilers provide efficient energy utilization, they also have some technical defects and challenges. For example, since thermal storage electric boilers operate in a high temperature and high pressure environment for a long time, it is not only a huge challenge to the safety of the surrounding environment, but also because the heat exchange pipes in the thermal storage unit are in a high temperature difference environment for a long time, the service life of the heat exchange pipes is very limited and the maintenance cost is extremely high. In addition, during the actual operation of thermal storage electric boilers, some heat energy will inevitably be lost, resulting in low energy utilization. Utility Model Content

[0004] In order to solve the technical defects of the prior art, the utility model proposes a steam supply and heat storage system with cyclic preheating, which can not only realize waste heat recovery and improve energy utilization efficiency, but also extend equipment life and reduce maintenance costs.

[0005] The main technical solutions adopted in this utility model are:

[0006] A steam supply and heat storage system capable of cyclic preheating comprises a water supply unit, a steam drum unit, a steam supply unit and a heat storage unit, wherein the heat storage unit comprises a heat storage module and a water jacket covering the outside of the heat storage module, wherein:

[0007] The water outlet end I of the water supply unit is connected to the water inlet end of the drum unit through a water supply pipeline, and is used to supply water to the drum unit; the water outlet end II of the water supply unit is connected to the water inlet end of the water jacket of the heat storage unit through a water supply pipeline, and the water outlet end of the water jacket is connected to the water inlet end I of the water supply unit, forming a preheated water circulation loop;

[0008] The water outlet of the drum unit is connected to the heat exchange inlet of the heat storage unit, and the heat exchange outlet of the heat storage unit is connected to the steam-liquid mixing inlet of the drum unit to form a steam supply heat circulation loop;

[0009] The steam outlet port of the steam drum unit is connected to the steam inlet port of the steam supply unit for providing hot steam.

[0010] Preferably, the water supply unit comprises a normal pressure water tank, the top of the normal pressure water tank is provided with a water inlet end I and a water inlet end II, wherein the water inlet end I is connected with the water outlet end of the water jacket, the water inlet end II of the normal pressure water tank is connected with the user water supply through a float valve, the bottom of the normal pressure water tank is provided with a water outlet end I and a water outlet end II, which are connected with the steam drum unit and the water jacket respectively, and the top of the normal pressure water tank is provided with a vent, which is connected with the atmosphere.

[0011] Preferably, the normal pressure water tank is also provided with an overflow port.

[0012] Preferably, a pump unit I is provided on the water supply pipeline between the water supply unit and the drum unit, a pump unit II is provided on the water supply pipeline between the water supply unit and the water jacket, and both the pump unit I and the pump unit II are provided with a backflow cutoff device for preventing water backflow.

[0013] Preferably, the steam drum unit includes at least one steam drum, and each steam drum is respectively connected to the water supply unit, the steam supply unit and the heat storage unit, and the installation height of each steam drum is higher than the heat storage module in the heat storage unit.

[0014] Preferably, a pressure sensor and a temperature sensor are provided on the steam drum of the steam drum unit for real-time monitoring of the internal air pressure and temperature of the steam drum. A liquid level sensor is also provided inside the steam drum of the steam drum unit for real-time monitoring of the water level inside the steam drum.

[0015] Preferably, the heat exchange inlet end of the heat storage unit is located at the bottom end of the heat storage unit, and the heat exchange inlet end of the heat storage unit is connected to the heat exchange channel of the heat storage unit through a plurality of branch pipes, and the heat exchange outlet end of the heat storage unit is located at the top end of the heat storage unit, and the heat exchange outlet end of the heat storage unit is connected to the steam drum unit through a plurality of branch pipes.

[0016] Preferably, a temperature and pressure reducer is provided in the pipeline connecting the steam supply unit and the steam drum unit to prevent the transported hot steam from being overheated and overpressurized.

[0017] Preferably, a pressure relief safety valve is provided on the steam drum in the steam drum unit.

[0018] Beneficial effects: The utility model provides a steam supply and heat storage system capable of cyclic preheating, which has the following advantages:

[0019] (1) In the utility model, a heat storage module is used to convert low-peak electricity at night into thermal energy and then store it. Then, during the peak electricity consumption period, the steam supply heat circulation loop is used to release it as needed in the form of hot steam, thereby achieving the purpose of shifting the peak and filling the valley and reducing the heating cost.

[0020] (2) In the utility model, a preheated water circulation loop is used to recycle the heat energy dissipated from the heat storage module to the water jacket, thereby improving energy utilization. At the same time, by preheating the water in the water tank, the temperature difference between the water and the heat exchange pipe when it enters the heat storage module is reduced, and the thermal stress of the heat exchange pipe is reduced, which is beneficial to extending the service life of the heat exchange pipe and reducing the equipment maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the overall schematic diagram of the system of the utility model;

[0022] In order to clearly show the connection relationship between the system pipes, the water jacket and the heat storage module are placed in Figure 1 Separately expressed in the middle.

[0023] In the figure: water supply unit 1, normal pressure water tank 1-1, float valve 1-2, vent 1-3, overflow port 1-4, steam drum unit 2, steam drum 2-1, pressure sensor 2-2, temperature sensor 2-3, liquid level sensor 2-4, pressure relief safety valve 2-5, steam supply unit 3, temperature and pressure reduction 3-1, heat storage unit 4, heat storage module 4-1, water jacket 4-2, pump unit I5, stop valve I5-1, reflux valve 5-2, water pump 5-3, filter 5-4 and stop valve II5-5, pump unit II6. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in conjunction with the accompanying drawings and embodiments. The following description of the specific implementation is only exemplary, and it should be understood that the specific implementation described here is only used to explain the utility model, and is by no means a limitation of the utility model and its application or usage.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. On the contrary, when an element is referred to as being "directly" connected to another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc. indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. Embodiment 1:

[0027] With a heat storage unit of 1500*700*700mm and 0.8m 3 Take the steam drum of the heat storage unit as an example, where the heat storage temperature of the heat storage unit is 250-550℃, the heating rod parameters are 2.5KW, 220*1600mm, and the number of heat exchange pipes is: 5 pipes per group, a total of 2 groups. Based on the above heat storage unit and steam drum, Figure 1 As shown, this embodiment 1 discloses a steam supply and heat storage system with cyclic preheating, including a water supply unit 1, a steam drum unit 2, a steam supply unit 3 and a heat storage unit 4, wherein the heat storage unit 4 includes a heat storage module 4-1 and a water jacket 4-2 coated on the outside of the heat storage module 4-1, wherein:

[0028] The water outlet end I of the water supply unit 1 is connected to the water inlet end of the drum unit 2 through a water supply pipeline, so as to supply water to the drum unit; the water outlet end II of the water supply unit 1 is connected to the water inlet end of the water jacket 4-2 of the heat storage unit 4 through a water supply pipeline, and the water outlet end of the water jacket 4-2 is connected to the water inlet end I of the water supply unit 1, so as to form a preheated water circulation loop;

[0029] The water outlet of the drum unit 2 is connected to the heat exchange inlet of the heat storage unit 4, and the heat exchange outlet of the heat storage unit 4 is connected to the steam-liquid mixing inlet of the drum unit 2, forming a steam supply heat circulation loop;

[0030] The steam outlet port of the steam drum unit 2 is connected to the steam inlet port of the steam supply unit 3 for providing hot steam.

[0031] In this embodiment 1, the water supply unit 1 includes a normal pressure water tank 1-1, and the top of the normal pressure water tank 1-1 is provided with a water inlet end I and a water inlet end II, wherein the water inlet end I is connected with the water outlet end of the water jacket 4-2, and the water inlet end II of the normal pressure water tank 1-1 is connected with the user's water supply through a float valve 1-2, and the bottom of the normal pressure water tank is provided with a water outlet end I and a water outlet end II, which are connected to the steam drum unit 2 and the water jacket 4-2 respectively, and the top of the normal pressure water tank 1-1 is provided with a vent 1-3, which is connected to the atmosphere.

[0032] In order to prevent the water in the normal pressure water tank 1-1 from flowing out from the top after it is full, an overflow port 1-4 is also provided on the normal pressure water tank 1-1.

[0033] In this embodiment 1, a pump unit I5 is provided on the water supply pipeline between the water supply unit 1 and the drum unit 2, and a pump unit II6 is provided on the water supply pipeline between the water supply unit 1 and the water jacket 4-2, and both the pump unit I5 and the pump unit II6 are provided with a backflow cut-off device for preventing water backflow.

[0034] In this embodiment 1, the specific structure of the pump unit I5 and the pump unit II6 can be but not limited to the following structure: the pump unit I or the pump unit II includes two pump branches, and each pump branch includes a stop valve I5-1, a reflux valve 5-2, a water pump 5-3, a filter 5-4 and a stop valve II5-5 connected in series in sequence. Among them, one pump branch serves as the main water supply branch, and the other pump branch serves as a backup water supply branch to prevent the main water supply branch from failing.

[0035] In the present utility model, the pump unit I5 and the pump unit II6 can be selectively designed by those skilled in the art according to actual delivery requirements.

[0036] In this embodiment 1, the steam drum unit 2 includes a steam drum 2 - 1 , and the installation height of the steam drum 2 - 1 is higher than the heat storage module 4 - 1 in the heat storage unit 3 .

[0037] In order to further improve the safety and reliability of the system, a pressure sensor 2-2 and a temperature sensor 2-3 are provided on the steam drum 2-1 of this embodiment 1 for real-time monitoring of the internal air pressure and temperature of the steam drum 2-1. A liquid level sensor 2-4 is also provided inside the steam drum 2-1 for real-time monitoring of the water level inside the steam drum 2-1.

[0038] In this embodiment 1, the heat exchange inlet end of the heat storage unit 4 is located at the bottom end of the heat storage unit 4, and the heat exchange inlet end of the heat storage unit 4 is connected to the heat exchange channel of the heat storage unit 4 through a plurality of branch pipes, and the heat exchange outlet end of the heat storage unit 4 is located at the top end of the heat storage unit 4, and the heat exchange outlet end of the heat storage unit 4 is connected to the steam drum unit 2 through a plurality of branch pipes.

[0039] In this embodiment 1, a temperature and pressure reducer 3-1 is provided in the pipeline connecting the steam supply unit 3 and the steam drum unit 2 to prevent the transported hot steam from being overheated and overpressurized.

[0040] In this embodiment 1, in order to prevent the gas pressure in the steam drum 2-1 from being too high, a pressure relief safety valve 2-5 is also provided on the steam drum.

[0041] In the present invention, the size of the drum 2-1 can be set according to the actual heating demand and heat storage demand, and the drum 2-1 in the drum unit 2 can be but not limited to using one drum, and the number of drums can be designed according to actual needs. Each drum 2-1 is connected to the water supply unit 1, the steam supply unit 3 and the heat storage unit 4 respectively.

[0042] In the present invention, the size of the heat storage module 4-1 in the heat storage unit 4 and the size of the steam drum 2-1 in the steam drum unit 2 can be selectively designed by those skilled in the art according to actual heat storage and heating needs.

[0043] In the present invention, the heat storage module 4-1 is preferably a solid heat storage module, but is not limited to solid heat storage modules, and any existing heat storage device that can achieve heat storage and heat exchange can be applicable.

[0044] The working principle of the utility model is as follows:

[0045] like Figure 1 As shown, the direction indicated by the arrow is the flow direction of water or water vapor.

[0046] Preheating water circulation loop: The user supplies water to the normal pressure water tank, and the water is heated by the water jacket 4-2 under the action of the pump unit Ⅰ5, and then re-enters the normal pressure water tank 1-1, and this is repeated to form a circulating preheating loop. In the utility model, the circulating preheating loop can be always open for repeated cyclic preheating, which can not only realize waste heat recovery, improve thermal energy utilization efficiency, and save energy, but also prevent the heat storage module 4-1 from overheating by reducing the temperature of the water jacket 4-2 outside the heat storage module 4-1, which is conducive to increasing the service life of the equipment and reducing the operating cost of the equipment.

[0047] Steam supply heat circulation loop: water is supplied to the atmospheric pressure water tank 1-1 by the user, and the water is sent to the drum 2-1 at a certain flow rate for storage under the action of the pump body unit II. When it is necessary to provide hot steam for the steam supply unit, the water outlet port of the drum 2-1 can be opened. Since the installation position of the drum 2-1 is higher than the heat storage unit 4, there is a pressure difference in the water flow in the pipeline. Using this pressure difference, the water automatically flows to the heat exchange inlet end at the bottom of the heat storage unit 4, and enters the heat exchange channel through multiple layers of branches. The water entering the heat exchange channel is heated at high temperature by the heat storage module 4-1, vaporized to generate a vapor-liquid mixture including water vapor, and then collected through the heat exchange outlet end and enters the drum 2-1. After the vapor-liquid mixture entering the drum 2-1 is separated by vapor and liquid, the hot steam can enter the steam supply unit through the steam outlet port to realize steam heating. If the temperature of the hot steam entering the steam supply unit is too high and the air pressure is too high, the temperature and pressure reducer 3-1 can be used to reduce the temperature and pressure of the hot steam. The liquid water after gas-liquid separation can re-enter the heat storage unit 4 through the water outlet port for heat exchange cycle.

[0048] When the water level detected by the liquid level sensor 2-4 in the drum 2-1 is lower than the preset safety value, the atmospheric pressure water tank 1-1 can be controlled to replenish the drum 2-1. When the water level in the drum 2-1 is higher than the preset safety value, the water supply unit 1 can be controlled to stop supplying water to the drum 2-1.

[0049] In the present invention, the preheated water circulation loop and the steam supply heat circulation loop can work simultaneously or separately. The water preheated by the preheated water circulation loop flows into the steam supply heat circulation loop, which can reduce the temperature difference of the water entering the heat storage module 4-1, thereby avoiding thermal stress caused by different thermal expansion degrees of different parts of the material in the heat exchange channel, which is beneficial to prolonging the life of the equipment.

[0050] In the utility model, the heat storage unit can utilize the low-peak electricity at night (23:00-7:00, a total of 8 hours) to heat the heat storage module to a certain temperature (for example, 600°C) to store heat, and then release it on demand in the form of hot steam by utilizing the steam supply heat circulation loop during the peak electricity consumption period, so as to achieve the effect of shifting the peak and filling the valley, thereby reducing the heating cost.

[0051] In the present invention, in order to achieve effective control of water flow or steam in the pipeline, the skilled person in the art can set the existing valves, instruments and controllers in pipeline engineering such as stop valves, reflux valves, pressure gauges and flow controllers in the pipeline according to actual needs. In the present invention, the control system for controlling the heating of the system can be set based on the working principle of the present invention, which belongs to conventional technical means, so it is not described in detail.

[0052] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A steam supply and heat storage system with cyclic preheating, comprising a water supply unit, a steam drum unit, a steam supply unit and a heat storage unit, characterized in that: The heat storage unit comprises a heat storage module and a water jacket covering the outside of the heat storage module, wherein: The water outlet end I of the water supply unit is connected to the water inlet end of the drum unit through a water supply pipeline, and is used to supply water to the drum unit; the water outlet end II of the water supply unit is connected to the water inlet end of the water jacket of the heat storage unit through a water supply pipeline, and the water outlet end of the water jacket is connected to the water inlet end I of the water supply unit, forming a preheated water circulation loop; The water outlet of the drum unit is connected to the heat exchange inlet of the heat storage unit, and the heat exchange outlet of the heat storage unit is connected to the steam-liquid mixing inlet of the drum unit to form a steam supply heat circulation loop; The steam outlet port of the steam drum unit is connected to the steam inlet port of the steam supply unit for providing hot steam.

2. The cyclic preheating steam supply and heat storage system according to claim 1 is characterized in that: The water supply unit comprises a normal pressure water tank, the top of which is provided with a water inlet end I and a water inlet end II, wherein the water inlet end I is connected with the water outlet end of the water jacket, the water inlet end II of the normal pressure water tank is connected with the user water supply through a float valve, the bottom of the normal pressure water tank is provided with a water outlet end I and a water outlet end II, which are connected with the steam drum unit and the water jacket respectively, and the top of the normal pressure water tank is provided with a vent which is connected with the atmosphere.

3. The cyclic preheating steam supply and heat storage system according to claim 2 is characterized in that: The normal pressure water tank is also provided with an overflow port.

4. The cyclic preheating steam supply and heat storage system according to any one of claims 1 to 3, characterized in that: A pump unit I is arranged on the water supply pipeline between the water supply unit and the drum unit, and a pump unit II is arranged on the water supply pipeline between the water supply unit and the water jacket, and both the pump unit I and the pump unit II are provided with a backflow cutoff device for preventing water backflow.

5. The cyclic preheating steam supply and heat storage system according to claim 4 is characterized in that: The steam drum unit includes at least one steam drum, and each steam drum is connected to the water supply unit, the steam supply unit and the heat storage unit respectively, and the installation height of each steam drum is higher than the heat storage module in the heat storage unit.

6. The cyclic preheating steam supply and heat storage system according to claim 4 is characterized in that: The steam drum of the steam drum unit is provided with a pressure sensor and a temperature sensor for real-time monitoring of the internal air pressure and temperature of the steam drum. The steam drum of the steam drum unit is also provided with a liquid level sensor for real-time monitoring of the water level inside the steam drum.

7. The cyclic preheating steam supply and heat storage system according to claim 4 is characterized in that: The heat exchange inlet end of the heat storage unit is located at the bottom end of the heat storage unit, and the heat exchange inlet end of the heat storage unit is connected to the heat exchange channel of the heat storage unit through a plurality of branch pipes. The heat exchange outlet end of the heat storage unit is located at the top end of the heat storage unit, and the heat exchange outlet end of the heat storage unit is connected to the steam drum unit through a plurality of branch pipes.

8. The cyclic preheating steam supply and heat storage system according to claim 4, characterized in that: A temperature and pressure reducer is arranged in the pipeline connecting the steam supply unit and the steam drum unit to prevent the transported hot steam from being overheated and overpressurized.

9. The cyclic preheating steam supply and heat storage system according to claim 4, characterized in that: A pressure relief safety valve is arranged on the steam drum in the steam drum unit.

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