Circulating heat storage system for steam heat supply

Abstract

The utility model discloses a circulating heat storage system for steam heat supply, which comprises a water storage unit, a steam pocket unit, a steam supply unit and a heat exchange unit, and is characterized in that the water storage unit is communicated with the water inlet end of the steam pocket unit through a water supply pipeline and is used for supplying water to the steam pocket unit; a steam pocket descending pipe of the steam pocket unit communicates with the heat exchange inlet end of the heat exchange unit and is used for providing a heat exchange medium for the heat exchange unit, and the heat exchange outlet end of the heat exchange unit communicates with the steam-liquid mixing inlet end of the steam pocket unit and is used for providing mixed steam and liquid after heat exchange for the steam pocket unit; a steam outlet port I of the steam pocket unit is communicated with the steam inlet end of the steam supply unit and used for providing hot steam, and a steam outlet port II of the steam pocket unit is communicated with the steam inlet end of the water storage unit through a backflow pipeline and used for preheating water in the water storage unit. According to the utility model, not only can the safety and reliability of equipment operation be improved, but also the heat energy of hot steam can be fully utilized, waste heat recovery is realized, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat storage, in particular to a circulating heat storage system for steam heating. Background Art

[0002] Thermal storage electric boilers mainly use the electricity during the off-peak hours at night to heat water and store heat energy, and then release the heat energy during the day or during peak hours for heating or hot water. This method not only improves the utilization rate of the equipment, but also reduces the initial investment cost of the equipment. At the same time, due to the use of off-peak electricity, it also plays a role in peak-shaving and valley-filling, saving electricity, and reducing the emission of harmful gases in the city.

[0003] As a complex system, the thermal storage electric boiler involves the coordinated work of multiple parts and components. If there are defects or deficiencies in the design and manufacturing process of these parts and components, the risk of equipment failure may increase. Since the thermal storage electric boiler will generate a high temperature and high pressure environment during operation, this environment is very sensitive to the equipment. If the equipment cannot withstand the high temperature and high pressure environment, it may cause equipment damage or safety accidents. Utility Model Content

[0004] In order to solve the technical defects of the prior art, the utility model proposes a circulating heat storage system for steam heating, which can not only improve the safety and reliability of equipment operation, but also make full use of the thermal energy of hot steam, realize waste heat recovery, and improve energy utilization efficiency.

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

[0006] A circulating heat storage system for steam heating comprises: a water storage unit, a drum unit, a steam supply unit and a heat exchange unit, wherein the water storage 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 drum downcomer of the drum unit is connected to the heat exchange inlet end of the heat exchange unit, and is used to provide heat exchange medium to the heat exchange unit; the heat exchange outlet end of the heat exchange unit is connected to the steam-liquid mixed inlet end of the drum unit, and is used to provide the drum unit with mixed steam and liquid after heat exchange; the steam outlet port I of the drum unit is connected to the steam inlet end of the steam supply unit, and is used to provide hot steam; the steam outlet port II of the drum is connected to the steam inlet end of the water storage unit through a reflux pipeline, and is used to preheat the water in the water storage unit.

[0007] Preferably, a pump unit is provided on the water supply pipeline between the water storage unit and the drum unit, and a backflow cutoff device is provided in the pump unit to prevent water backflow.

[0008] Preferably, the pump body unit includes two pump body branches, and each pump body branch includes a stop valve I, a reflux valve, a water pump, a filter and a stop valve II which are connected in series in sequence, and the stop valve I is located at one end close to the steam drum unit, and the stop valve II is located at one end close to the water storage unit.

[0009] Preferably, the steam drum unit includes at least one steam drum, and each steam drum is respectively connected to the water storage unit, the steam supply unit and the heat exchange unit, and the installation position of each steam drum is higher than the heat exchange unit.

[0010] Preferably, a steam drum downcomer is provided at the bottom of the steam drum of the steam drum unit, a steam outlet port I and a steam outlet port II are provided at the top of the steam drum, and a pressure transmitter and a temperature transmitter 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 water level sensor is also provided inside the steam drum of the steam drum unit for real-time monitoring of the water storage position inside the steam drum.

[0011] Preferably, the heat exchange unit includes a heat storage module, and the heat exchange inlet end of the heat exchange unit is located at the bottom end of the heat storage module, and the heat exchange inlet end of the heat exchange unit is connected to the heat exchange channel of the heat storage module through a plurality of branch pipes, and the heat exchange outlet end of the heat exchange unit is located at the top end of the heat storage module, and the heat exchange outlet end of the heat exchange unit is connected to the steam drum unit through a plurality of branch pipes.

[0012] 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.

[0013] Preferably, the steam drum in the steam drum unit and the water tank in the water storage unit are both provided with pressure relief safety valves.

[0014] Preferably, a controllable valve is provided on the reflux pipeline for controlling the switch of the reflux pipeline.

[0015] Preferably, a liquid level sensor is provided on the water tank of the water storage unit for monitoring the water level in the water tank in real time.

[0016] Beneficial effects: The utility model provides a circulating heat storage system for steam heating, which has the following advantages:

[0017] (1) In the utility model, the over-pressure water vapor in the steam drum can be returned to the water tank by using the return pipe to preheat the water in the water tank, which not only realizes the safe pressure relief of the steam drum, but also can effectively recover the heat of the excess water vapor and improve the energy utilization rate.

[0018] (2) In the utility model, a water pressure difference is formed by setting the installation positions of the steam drum and the heat exchange unit, and the pressure difference is used to form a heat exchange cycle between the steam drum and the heat exchange unit, so that the heat energy stored in the heat exchange unit during off-peak hours is released during peak hours of electricity consumption, thereby achieving the purpose of peak shaving and valley filling and saving electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall system structure of the utility model.

[0020] In the figure: water storage unit 1, water tank 1-1, liquid level sensor 1-2, steam drum unit 2, steam drum 2-1, pressure transmitter 2-2, temperature transmitter 2-3, water level sensor 2-4, steam supply unit 3, temperature reducer 3-1, heat exchange unit 4, heat storage module 4-1, reflux pipe 5, controllable valve 5-1, pump unit 6, stop valve I 6-1, reflux valve 6-2, water pump 6-3, filter 6-4, stop valve II 6-5, regulating valve 7, water flow meter 8, pressure relief safety valve 9. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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. Example

[0024] The solid thermal storage module with the size of 1425*700*700mm and 0.3m 3 Take the steam drum as an example, where the heat storage temperature of the heat exchange unit is 250-650℃, the heating rod parameters are 2.5KW, 220*1600mm, and the number of heat exchange pipes is: 5 pipes per group, a total of 4 groups. Based on the above solid heat storage module and steam drum, Figure 1 As shown, this embodiment 1 discloses a circulating heat storage system for steam heating, including a water storage unit 1, a drum unit 2, a steam supply unit 3 and a heat exchange unit 4, wherein the water storage unit 1 is connected to the water inlet end of the drum unit 2 through a water supply pipe, and is used to supply water to the drum unit 2; the drum downcomer (i.e., the water outlet end) of the drum unit 2 is connected to the heat exchange inlet end of the heat exchange unit 4, and is used to provide heat exchange medium (i.e., water supply) to the heat exchange unit 4; the heat exchange outlet end of the heat exchange unit 4 is connected to the steam-liquid mixed inlet end of the drum unit 2, and is used to provide the drum unit 2 with mixed steam and liquid after heat exchange; the steam outlet port I of the drum unit 2 is connected to the steam inlet end of the steam supply unit 3, and is used to provide hot steam; the steam outlet port II of the drum is connected to the steam inlet end of the water storage unit 1 through a reflux pipe 5, and is used to preheat the water in the water storage unit 1.

[0025] In order to ensure that the water in the water storage unit 1 can effectively enter the steam drum unit 2, in this embodiment 1, a pump body unit 6 is arranged on the water supply pipeline between the water storage unit 1 and the steam drum unit 2, and a backflow cut-off device is arranged in the pump body unit 6 to prevent water backflow.

[0026] In this embodiment 1, the pump body unit includes two pump body branches, and each pump body branch includes a stop valve I 6-1, a reflux valve 6-2, a water pump 6-3, a filter 6-4 and a stop valve II 6-5 connected in series in sequence, and the stop valve I 6-1 is located at one end close to the drum unit 2, and the stop valve II 6-5 is located at one end close to the water storage unit 1. One of the pump body branches is used as the main water supply branch to supply water in the water storage unit to the drum unit. The other pump body branch is used as a backup water supply branch to prevent the main water supply branch from failing and affecting the system heating efficiency, which is conducive to improving the reliability of the system.

[0027] The pump unit 6 in the present invention can be but not limited to the above structure, and any existing device that can provide conveying power for the fluid can be applicable.

[0028] In this embodiment 1, a regulating valve 7 and a water flow meter 8 are further provided on the pipeline connecting the pump unit 6 and the drum unit 2 to adjust the water supply of the drum unit 2.

[0029] In this embodiment 1, the steam drum unit 2 includes a steam drum 2 - 1 , and the installation position of the steam drum 2 - 1 is higher than the heat exchange unit 4 .

[0030] In this embodiment 1, a steam drum downcomer is provided at the bottom of the steam drum 2-1, a steam outlet port I and a steam outlet port II are provided at the top of the steam drum 2-1, and a pressure transmitter 2-2 and a temperature transmitter 2-3 are provided on the steam drum 2-1 for real-time monitoring of the internal air pressure and temperature of the steam drum 2-1. A water level sensor 2-4 is also provided inside the steam drum 2-1 for real-time monitoring of the water storage position inside the steam drum 2-1.

[0031] In this embodiment 1, the heat exchange unit 4 includes a heat storage module 4-1, and the heat exchange inlet end of the heat exchange unit 4 is located at the bottom end of the heat storage module 4-1, and the heat exchange inlet end of the heat exchange unit 4 is connected to the heat exchange channel of the heat storage module 4-1 through a plurality of branch pipes, and the heat exchange outlet end of the heat exchange unit 4 is located at the top end of the heat storage module 4-1, and the heat exchange outlet end of the heat exchange unit 4 is connected to the steam drum unit 2 through a plurality of branch pipes.

[0032] In this embodiment 1, a multi-layer branch is used to connect the drum downcomer of the drum unit 2 with the heat exchange channel of the heat exchange unit 4, which is conducive to evenly distributing water to the heat exchange unit and improving the heat exchange uniformity. At the same time, a control valve can be set on each branch to adjust the steam flow by controlling the number of flow branches.

[0033] In order to improve the safety and reliability of the steam supply unit, 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.

[0034] In order to prevent the gas pressure in the steam drum or the water storage unit from being too high and exceeding the safety limit, a pressure relief safety valve 9 is provided on the steam drum 2 - 1 in the steam drum unit and the water tank 1 - 1 in the water storage unit 1 .

[0035] In this embodiment 1, a controllable valve 5 - 1 is provided on the reflux pipeline 5 for controlling the opening and closing of the reflux pipeline 5 .

[0036] In this embodiment 1, a liquid level sensor 1-2 is provided on the water tank 1-1 of the water storage unit 1 for real-time monitoring of the water level in the water tank.

[0037] In the utility model, the water tank 1-1 in the water storage unit 1 is a closed water tank, which is connected to the user's water supply pipeline and is used to buffer water supply, which is beneficial to improve the stability of water supply of the drum 2-1. At the same time, the reflux pipe 5 is connected to the steam outlet port II of the drum 2-1, and the reflux hot steam can be used to preheat the water in the water tank 1-1, thereby improving the utilization rate of thermal energy and the heat exchange efficiency of the heat exchange unit.

[0038] The working principle of the utility model is as follows:

[0039] like Figure 1As shown, the direction indicated by the arrow is the flow direction of water or water vapor. First, the user supplies water to store a certain liquid level in the water tank 1-1 of the water storage unit 1, and then the pump unit 6 is used to send the water to the drum 2-1 at a certain flow rate for storage. When it is necessary to provide hot steam for the steam supply unit 3, the drum downcomer of the drum 2-1 can be opened. Since the installation position of the drum 2-1 is higher than the heat exchange 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 exchange unit 4, and is evenly distributed into the heat exchange channel through multiple layers of branches. The water entering the heat exchange channel is vaporized at high temperature to generate a vapor-liquid mixture including water vapor, and then enters the drum 2-1 after being collected through the heat exchange outlet end. After entering the drum 2-1, the hot steam can enter the steam supply unit 3 through the steam outlet port I after the vapor-liquid separation device inside the drum is separated into vapor and liquid, so as to realize steam heating. If the temperature and pressure of the hot steam entering the steam supply unit 3 are 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 the vapor-liquid separation can re-enter the heat exchange unit 4 through the steam drum downcomer for circulation heat exchange.

[0040] When the pressure value in the drum 2-1 exceeds a certain range, part of the hot steam can be first transported from the steam outlet port II to the water tank 1-1 of the water storage unit 1 through the reflux pipe 5. On the one hand, the pressure value in the drum 2-1 can be reduced to achieve safe pressure relief. On the other hand, the waste heat utilization rate can be improved. The water in the water tank 1-1 is preheated so that after it enters the heat exchange unit 4 through the drum 2-1, the temperature difference between the water and the heat exchange channel can be reduced, which is not only conducive to improving the heat exchange efficiency, but also can protect the solid heat exchange tube from cracking due to heat exchange, thereby extending the service life of the equipment. In the utility model, in addition to opening the steam outlet port II for pressure relief and reflux when pressure relief is required, the steam outlet port II can also be opened during normal operation to preheat the water in the water tank 1-1.

[0041] When the water level detected by the water level sensor 2-4 in the drum 2-1 is lower than the preset safety value, the water storage unit 1 can be controlled to replenish the drum. When the water level in the drum 2-1 is higher than the preset safety value, the water storage unit 1 can be controlled to stop supplying water to the drum 2-1.

[0042] When the water level detected by the liquid level sensor 1-2 in the water tank 1-1 in real time is lower than a preset value, the user water supply can be controlled to replenish the water tank 1-1. When the water level in the water tank 1-1 is higher than a preset value, the user water supply can be stopped.

[0043] In the utility model, the size of the steam drum can be set according to the actual heating demand and heat storage demand, and the steam drum in the steam drum unit can be but not limited to using one steam drum, and the number of steam drums can be designed according to actual needs. Each steam drum is connected to the water storage unit, the steam supply unit and the heat exchange unit respectively.

[0044] In the present invention, the heat storage device in the heat exchange unit is preferably a vertical heat storage solid module, but is not limited to the above heat storage device, and existing heat storage devices are applicable. The water in the drum can enter the heat exchange unit through the drum downcomer by using the pressure difference, or a pump device can be set in the connecting pipeline between the heat exchange inlet end of the heat exchange unit and the drum downcomer for forced circulation. The specific setting method can be set by those skilled in the art according to actual needs.

[0045] In the present invention, in order to achieve effective control of water flow or steam in the pipeline, the technicians in this field can set the existing valves, instruments and controllers in pipeline engineering such as stop valves, reflux valves, pressure gauges, flow transmitters, temperature transmitters, pressure transmitters, liquid level transmitters and pressure stabilizing containers 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.

[0046] 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.

[0047] 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 circulating heat storage system for steam heating, characterized in that: include: A water storage unit, a steam drum unit, a steam supply unit and a heat exchange unit, wherein the water storage unit is connected to the water inlet end of the steam drum unit through a water supply pipe, so as to supply water to the steam drum unit; the steam drum downcomer of the steam drum unit is connected to the heat exchange inlet end of the heat exchange unit, so as to provide heat exchange medium to the heat exchange unit; the heat exchange outlet end of the heat exchange unit is connected to the steam-liquid mixed inlet end of the steam drum unit, so as to provide the steam drum unit with mixed steam and liquid after heat exchange; the steam outlet port I of the steam drum unit is connected to the steam inlet end of the steam supply unit, so as to provide hot steam; the steam outlet port II of the steam drum is connected to the steam inlet end of the water storage unit through a reflux pipe, so as to preheat the water in the water storage unit.

2. The circulating heat storage system for steam heating according to claim 1, characterized in that: A pump unit is arranged on the water supply pipeline between the water storage unit and the drum unit, and a backflow cut-off device is arranged in the pump unit to prevent water backflow.

3. The circulating heat storage system for steam heating according to claim 2, characterized in that: The pump body unit includes two pump body branches, and each pump body branch includes a stop valve I, a reflux valve, a water pump, a filter and a stop valve II which are connected in series in sequence, and the stop valve I is located at one end close to the steam drum unit, and the stop valve II is located at one end close to the water storage unit.

4. The circulating heat storage system for steam heating according to claim 1, characterized in that: The steam drum unit includes at least one steam drum, and each steam drum is connected to the water storage unit, the steam supply unit and the heat exchange unit respectively, and the installation position of each steam drum is higher than the heat exchange unit.

5. The circulating heat storage system for steam heating according to any one of claims 1 to 4, characterized in that: A steam drum downcomer is arranged at the bottom of the steam drum of the steam drum unit, a steam outlet port I and a steam outlet port II are arranged at the top of the steam drum, and a pressure transmitter and a temperature transmitter are arranged 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 water level sensor is also arranged inside the steam drum of the steam drum unit for real-time monitoring of the water storage position inside the steam drum.

6. The circulating heat storage system for steam heating according to any one of claims 1 to 4, characterized in that: The heat exchange unit includes a heat storage module, and a heat exchange inlet end of the heat exchange unit is located at the bottom end of the heat storage module, and the heat exchange inlet end of the heat exchange unit is connected to the heat exchange channel of the heat storage module through a plurality of branch pipes, and a heat exchange outlet end of the heat exchange unit is located at the top end of the heat storage module, and the heat exchange outlet end of the heat exchange unit is connected to the steam drum unit through a plurality of branch pipes.

7. The circulating heat storage system for steam heating according to any one of claims 1 to 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.

8. The circulating heat storage system for steam heating according to any one of claims 1 to 4, characterized in that: The steam drum in the steam drum unit and the water tank in the water storage unit are both provided with pressure relief safety valves.

9. The circulating heat storage system for steam heating according to any one of claims 1 to 4, characterized in that: The reflux pipeline is provided with a controllable valve for controlling the switch of the reflux pipeline.

10. The circulating heat storage system for steam heating according to any one of claims 1 to 4, characterized in that: The water tank of the water storage unit is provided with a liquid level sensor for real-time monitoring of the water level in the water tank.

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