Solid heat storage and direct supply integrated heating device

Abstract

This patent provides an integrated heating device for solid heat storage and direct supply. Its heat storage body includes an array formed by stacking multiple heat storage brick units. Each heat storage brick unit includes a first hole and a second hole, and the first hole and the second hole penetrate through the heat storage brick unit; a heating wire passes through the second hole and bypasses the first hole and passes outside the first hole. This patent combines the advantages of solid heat storage for deep peak shaving of coal-fired units in thermal power plants during the heating period and electrode boilers into an organic whole, expanding the scope of use, reducing equipment investment, and improving the flexibility of deep peak shaving and heating supply.

Description

Technical Field

[0001] This patent belongs to the field of energy technology and relates to a heat supply device integrating solid heat storage and direct supply. In particular, it is a heat supply device suitable for deep peak shaving of coal-fired units in thermal power plants during the heating period. Background Art

[0002] In the prior art, various heat storage devices have emerged. Their main working principle is to convert electrical energy into thermal energy and store it in the heat storage device.

[0003] Among them, solid heat storage, heat storage tank heat storage, and electrode boilers are three methods among many solutions in the thermal power flexibility transformation technology. Solid heat storage and heat storage tank heat storage supply heat through the heat of the heat storage device during peak shaving difficult periods, reducing the forced heat supply output; during periods with peak shaving surplus, the surplus heat is stored to achieve "thermal power decoupling". Electrode boilers convert excess electrical energy into thermal energy and supply it to users in a timely manner during peak shaving.

[0004] In the prior art, the solid heat storage device has the characteristics of small occupied space and large energy density, while the electrode boiler has no heat storage function, and the heat storage tank can store heat but has a large volume. Although the solid heat storage device has many advantages, the solid heat storage device does not have the direct supply function of the electrode furnace. When releasing energy, it can only release the energy in one heat storage unit completely, and cannot supply heat directly according to needs to achieve electric heat supply. Moreover, the released heat is also in units of heat storage units, so there are certain defects in flexibility. Summary of the Invention

[0005] The purpose of this patent is to provide a heat supply device for deep peak shaving of a coal-fired unit in a thermal power plant that integrates solid energy storage and direct heat supply, outputs heating hot water, and has automatic control.

[0006] To solve the above problems, the technical solutions provided by this patent include:

[0007] A heat supply device integrating solid heat storage and direct supply, including a chamber, the interior of the chamber includes a storage space; a circulation air duct, in which a wind-water heat exchanger and a fan are provided. The circulation air duct includes an inner circulation air duct and an outer circulation air duct. The path of the inner circulation air duct passes through the heat storage body, and the outer circulation air duct is communicated with the inner circulation air duct; a heat storage body, the heat storage body includes an array formed by stacking a plurality of heat storage brick units. Each heat storage brick unit includes a first hole and a second hole, and the first hole and the second hole penetrate through the heat storage brick unit; a heating wire passes through the second hole and bypasses the first hole and passes outside the first hole.

[0008] Preferably, the first hole is formed in the middle of a heat storage brick unit, and the second hole is formed in the upper and lower parts of the heat storage brick unit.

[0009] Preferably, the first holes are formed in the upper and lower parts of the regenerative brick unit, and the second holes can also be formed in the middle of the regenerative brick unit.

[0010] Preferably, one regenerative brick unit is composed of two regenerative bricks, the upper and the lower. Half holes are respectively formed on the contact surfaces of the upper and lower regenerative bricks, so as to form the first hole by splicing.

[0011] Preferably, the upper and lower half holes of the second hole are formed on the contact surfaces of the upper and lower two regenerative brick units, so as to form the second hole by splicing.

[0012] Preferably, on one side of the regenerative brick unit, the number of the second holes is more than two.

[0013] Preferably, the first hole can be formed to have a width wider than that of the second hole, so as to facilitate taking away more heat in the direct supply mode.

[0014] Preferably, the second holes are in clearance fit with the heating wires; connection gaps are formed between multiple second holes.

[0015] Preferably, the heating wires pass through the second holes of one regenerative brick unit, extend downward at the front end of the regenerative brick unit to the second holes below the regenerative brick unit and pass through the second holes, and extend downward at the rear end of the next regenerative brick unit, and so on.

[0016] Preferably, the heat insulation layer encloses the chamber on the periphery.

[0017] This patent integrates the advantages of solid heat storage of coal-fired power plants during the heating period for deep peak shaving and electric (electrode) boilers into an organic whole, expands the scope of use, reduces equipment investment, and improves the flexibility of deep peak shaving and heating supply. Description of the Drawings

[0018] Figure 1 is a structural diagram of an integrated heating device for solid heat storage and direct supply in a specific embodiment of this patent;

[0019] Figure 2 is a structural diagram of an integrated heating device for solid heat storage and direct supply in a specific embodiment of this patent;

[0020] Figure 3 is a structural diagram of the heat storage body in a specific embodiment of this patent;

[0021] Figure 4 is an enlarged structural diagram of the heat storage body;

[0022] Figure 5 is the front view of a single regenerative brick;

[0023] Figure 6 It is a top view of a single-piece heat storage brick. Detailed implementation manners

[0024] The technical solutions described in this patent include various specific embodiments and modifications made to various specific embodiments. In this detailed implementation manner, these technical solutions are exemplarily elaborated by combining with the accompanying drawings, so that the inventive concept, technical features, effects of technical features, etc. of this patent become more obvious through the description of these specific implementation manners. However, it should be pointed out that the protection scope of this patent should obviously not be limited to the content described in these embodiments, but can be implemented in various ways under the inventive concept of this patent.

[0025] In the description of this detailed implementation manner, the following reading references need to be noted to accurately understand the meaning expressed by the text in this detailed implementation manner:

[0026] First of all, for the accompanying drawings of this patent, the same or corresponding elements, etc. will be represented by the same reference numerals. Therefore, for the reference numerals or the names of elements, etc. that have appeared before, they may not be explained again later. And, in this detailed implementation manner, if terms such as "first", "second", etc. are used to modify various elements or elements, then in the case of not being specifically specified, "first" and "second" do not represent order, but only distinguish these elements or elements from each other. In addition, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" also refer not only to the singular but also to the plural forms.

[0027] Furthermore, "comprising" or "including" should be understood as an open-ended description, which does not exclude the existence of other components on the basis of the components that have been described; moreover, when a layer, region or component is said to be "formed on", "disposed on" another layer, region or component "above", this layer, region or component can be directly or indirectly formed on the said another layer, region or component. Similarly, when using similar terms such as "connected", "coupled" to express the relationship between two elements, without special limitation, it can be directly connected or indirectly connected. The relationship between the two elements connected by the term "and / or" can be a relationship of "and" or a relationship of "or".

[0028] In addition, to illustrate the technical solutions of this patent, the dimensions of the elements described in the accompanying drawings of this patent do not represent the dimensional proportional relationship of the actual elements, and will be enlarged or reduced in this patent for the convenience of expression. This detailed implementation manner provides an integrated heat supply device for solid heat storage and direct supply, as Figure 1 shown. The device includes:

[0029] Outer shell

[0030] A plurality of components of the heating device are accommodated in the housing. A heat insulation layer 7 is formed on the inner wall of the housing, and the heat insulation layer can keep the heat inside the integrated heat storage and direct supply heating device from being easily lost.

[0031] Compartment

[0032] A chamber 11 is formed in the housing. The chamber forms a sealed space, and the sealed space is substantially enclosed. A solid heat storage body 4 is arranged in the chamber. The solid heat storage body is preferably arranged in the middle of the chamber. On one side of the solid heat storage body is a heating medium inlet area, and on the other side is a heating medium outlet area. The heating medium is preferably air or other gaseous forms for easy flow. The heating medium in the heating medium inlet area is usually a heating medium with a lower temperature. After the heating medium is heated by the solid heat storage body, it is discharged through the heat release medium outlet area. The heating medium inlet area and the heating medium outlet area are connected through a channel in the middle of the heat storage body inside the chamber, and the heating medium inlet area and the heating medium outlet area are connected through a duct outside the chamber. In this way, the heating medium inside the chamber flows from the heating medium inlet area to the heating medium outlet area, and circulates from the heating medium outlet area to the heating medium inlet area outside the chamber, thereby forming a heating medium circulation channel.

[0033] The heat insulation layer 7 encloses the chamber peripherally to preserve the heat in the chamber and avoid energy loss. In this specific embodiment, as Figure 1 shown, an air inlet channel 5 and an air outlet channel 6 are formed on the wall of the chamber, as Figure 1As shown, the air inlet channel is arranged on one side wall of the chamber, making the structure of the solid heat storage furnace more compact. However, for different air flow paths, the air inlet channel and the air outlet channel can also be arranged on other walls, or they can be arranged on different walls. Inside the chamber, an internal circulation air duct is formed between the air inlet channel 5 and the air outlet channel 6. In the internal circulation air duct, air flows from the air inlet channel 5 towards the air outlet channel 6, and a part of the path of the internal circulation air duct passes through the heat storage body, thereby taking away the heat in the heat storage body. Outside the chamber, an external circulation air duct is formed between the air outlet channel 6 and the air inlet channel 5. A wind-water heat exchanger is arranged in the external circulation air duct, so as to utilize the heat carried out by the gas in the internal circulation air duct to heat the water in the wind-water heat exchanger to provide energy output. In this embodiment, a fan 2 is arranged in the external circulation air duct. The fan is connected to a controller (preferably a PLC controller). Through the control of the controller, the fan adjusts the air flow state in the circulation air duct, thereby realizing heat storage, direct supply heating or other working modes.

[0034] Except for communicating with the chamber at the air inlet channel and the air outlet channel, the external circulation air duct is basically isolated from the chamber. Figure 1 A preferred way of isolation is given in [description], that is, the air duct is arranged on the outer periphery of the chamber, which can not only achieve sufficient isolation but also ensure a reasonable overall occupied volume of the solid heat storage boiler. However, those skilled in the art can also set other air duct structures according to the actual site environment requirements.

[0035] Heat storage body

[0036] In order to achieve both heat storage and direct supply functions simultaneously, the structure of the heat storage body has been correspondingly improved in this specific embodiment.

[0037] In this specific embodiment, as Figure 4 shown, the heat storage body includes a plurality of stacked heat storage brick units, and the plurality of heat storage brick units form a heat storage brick array. In this specific embodiment, each heat storage brick unit includes a first hole 8 that penetrates through the heat storage brick; and a second hole 9, and the heating wire passes through the second hole, while the heating wire passes outside the first hole. Through the above structure, the heating wire in the second hole has a greater contact length with the heat storage brick, so it is convenient to heat the heat storage brick. Since there is no heating wire passing through the first hole, it is convenient for ventilation. When the power of the fan is increased, a strong air flow can be formed, taking out more heat of the heating wire, and then passing through the air outlet to contact the heat exchanger, heating the water in the heat exchanger, thereby achieving a technical effect similar to direct supply of heat while only storing a small amount of heat in the heat storage brick.

[0038] Further preferably, the first hole is formed in the middle of a heat storage brick unit, and the second hole is formed in the upper and lower parts of the heat storage brick unit. This facilitates processing into the required hole shape. In addition, the first hole can also be formed in the upper and lower parts of the heat storage brick unit, and the second hole can also be formed in the middle of the heat storage brick unit. In fact, as Figure 2 shown, with different division methods of the heat storage brick unit, they respectively correspond to the descriptions of the above two hole positions.

[0039] Preferably, the heat storage brick unit is composed of two upper and lower heat storage bricks. Half holes are respectively formed on the contact surfaces of the two upper and lower heat storage bricks, so as to be spliced into the first hole. This is more convenient for forming the structure of the first hole and facilitates installation and processing. The second hole forms upper and lower half holes on the contact surface of the upper and lower two heat storage brick units, so as to be spliced into the second hole. Preferably, on one side of the heat storage brick unit, the number of the second holes is more than two, preferably three, which can improve the heating effect on the heat storage brick during heating. And the first hole can be formed to have a width wider than that of the second hole, which is convenient for taking away more heat in the direct supply mode. Further preferably, the second hole is in clearance fit with the heating wire; a connection gap 10 is formed between multiple second holes, which can also facilitate taking away more heat in the direct supply mode.

[0040] The heating wire passes through the second hole of a heat storage brick unit, extends downward at the front end of the heat storage brick unit to the second hole below the heat storage brick unit and passes through the second hole, and extends downward at the rear end of the next heat storage brick unit. And so on, which can string up each divided heat storage brick through the heating wire and improve the stability of the heat storage brick.

[0041] Usage process

[0042] During the power grid peak shaving period, according to the instruction of the PLC controller, the switch cabinet is powered on, the heating wire 3 is electrified to heat the heat storage body 4, the fan 2 is started, the low-temperature air blows into the furnace body from the air inlet channel 5 and circulates to the air outlet channel 6 in the arrow direction. At this time, the low-temperature air is heated by the heater and the heat storage body to become high-temperature air, and the high-temperature air heats the heating water through the air-water heat exchanger 1, and the heating water is sent to the end user through the circulation pump.

[0043] ⑴ Heat storage function: The power is turned on, the heating wire 3 is electrified to heat the heat storage body 4, and the fan 2 is not started. As the heating time of the 3# heat storage brick extends, the heat storage body 4 absorbs more and more heat, and the temperature also rises to 600 °C, achieving the heat storage purpose. The main component of the material of the heat storage body 4 is magnesium oxide (MgO), and the specific heat capacity is 1.05 KJ / KG·°C. The heating device is composed of many heat storage bodies (see the external view of the heat storage body 4).

[0044] ⑵、Both heat storage and heat supply: When the power supply is turned on, the heating wire 3 is energized to heat the heat storage body 4, and the fan 2 is started. The low-temperature wind blows into the furnace body from the air inlet channel 5 and circulates to the air outlet channel 6 in the direction of the arrow. At this time, the low-temperature wind is heated by the heater and the heat storage body to become high-temperature wind. The high-temperature wind heats the heating water through the air-water heat exchanger 1, and the heating water is delivered to the end user through the circulation pump. By controlling the air volume of the fan, part of the heat energy emitted by the heating wire 3 passes through the air-water heat exchanger 1 to heat the heating water, and the remaining part of the heat energy is used for heat storage in the heat storage body 4.

[0045] ⑶. The ratio of maximum output power to input power is greater than 90%: by optimizing the heat exchange area of ​​the air-water heat exchanger 1, the air supply volume of the fan 2, and the heat dissipation capacity of the heat storage body 4, when the furnace temperature reaches a certain temperature, the output power is equal to the input power, and it has the same direct heating characteristics as an electric (electrode) boiler.

[0046] (4) Neither heat storage nor heat supply: During the non-peak load time of the power grid, the switch cabinet is disconnected from the power supply according to the instruction of the PLC controller, the heating wire 3 stops heating, and the heat storage body 4 does not store heat; when the fan 2 stops running, the heating is also interrupted.

[0047] This patent combines the advantages of solid heat storage and electric (electrode) boilers for deep peak regulation of coal-fired units in thermal power plants during the heating period into an organic whole, expanding the scope of use, reducing equipment investment, and improving the flexibility of deep peak regulation and heating supply.

[0048] The above is only a specific implementation method of this patent. Any modifications and replacements made to this patent under the invention concept of this patent should be included in the protection scope of this patent.

Claims

1. An integrated heating device for solid heat storage and direct supply, characterized in that including a chamber, the interior of which includes a storage space; a circulation air duct, in which a wind-water heat exchanger and a fan are provided. The circulation air duct includes an inner circulation air duct and an outer circulation air duct. The path of the inner circulation air duct passes through a heat storage body, and the outer circulation air duct is communicated with the inner circulation air duct; a heat storage body, which includes an array formed by stacking a plurality of heat storage brick units. Each heat storage brick unit includes a first hole and a second hole, and the first hole and the second hole penetrate through the heat storage brick unit; a heating wire passes through the second hole and bypasses the first hole and passes by the outside of the first hole; the heating wire in the second hole has a greater contact length with the heat storage brick, so it is convenient to heat the heat storage brick, and no heating wire passes through the first hole, so it is convenient for ventilation; wherein, the width of the first hole is wider than that of the second hole, which is convenient for taking away more heat in the direct supply mode; the heating wire passes through the second hole of one heat storage brick unit, extends downward at the front end of the heat storage brick unit to the second hole below the heat storage brick unit and passes through the second hole, and extends downward at the rear end of the next heat storage brick unit, and so on; a wind-water heat exchanger is provided in the outer circulation air duct, and the water in the wind-water heat exchanger is heated by the heat carried out by the gas in the inner circulation air duct; a fan is provided in the outer circulation air duct, and the fan is connected to a controller. Through the control of the controller, the fan adjusts the air flow state in the circulation air duct, so as to realize the working modes of heat storage and direct supply heating.

2. The integrated heating device for solid heat storage and direct supply according to claim 1, characterized in that, The first hole is formed in the middle of one heat storage brick unit, and the second hole is formed in the upper and lower parts of the heat storage brick unit.

3. The integrated heating device for solid heat storage and direct supply according to claim 1, characterized in that, The first hole is formed in the upper and lower parts of the heat storage brick unit, and the second hole is formed in the middle of the heat storage brick unit.

4. The integrated heat storage and direct supply heating device according to claim 3, characterized in that, One heat storage brick unit is composed of two upper and lower heat storage bricks, and half holes are respectively formed on the contact surfaces of the two upper and lower heat storage bricks, so as to form a first hole by splicing.

5. The integrated heating device for solid heat storage and direct supply according to claim 3, characterized in that The second hole forms upper and lower half holes on the contact surfaces of the upper and lower two heat storage brick units, so as to form a second hole by splicing.

6. The integrated heat storage and direct supply heating device according to claim 5, characterized in that On one side of the heat storage brick unit, the number of the second holes is more than two.

7. The integrated heating device for solid heat storage and direct supply according to claim 2, characterized in that, The second hole is in clearance fit with the heating wire; a connecting gap is formed between a plurality of second holes.

8. The integrated heating device for solid heat storage and direct supply according to claim 1, characterized in that, A heat preservation layer closes the chamber on the periphery.

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