Power supply system of small incineration power plant

Abstract

The utility model discloses a power supply system of a small-sized incineration power plant, relates to the technical field of incineration power generation, and mainly aims to solve the problems that a power supply system of an existing incineration power generation project is large in occupied area and high in cost. Comprising a first transformer, a second transformer, a first high-voltage switch cabinet, a second high-voltage switch cabinet, a first low-voltage wire inlet cabinet, a second low-voltage wire inlet cabinet, a middle switch cabinet, a first-section low-voltage power supply bus, a second-section low-voltage power supply bus, a low-voltage closed power supply bus bridge and a high-voltage power supply bus, the first high-voltage switch cabinet, the first transformer and the first low-voltage wire inlet cabinet are connected in series between a high-voltage power supply bus and a section of low-voltage power supply bus; the second high-voltage switch cabinet, the second transformer and the second low-voltage wire inlet cabinet are connected in series between the high-voltage power supply bus and the two-section low-voltage power supply bus; and the low-voltage closed power supply bus bridge and the middle switch cabinet are connected in series between the first-section low-voltage power supply bus and the second-section low-voltage power supply bus.

Description

Technical Field

[0001] The present application relates to the technical field of incineration power generation, and in particular to a power supply system for a small incineration power plant. Background Art

[0002] Incineration power generation is one of the key waste treatment measures in my country. Incineration power generation mainly involves incinerating solid waste and using the flue gas generated by incineration to generate electricity. This waste treatment method has the characteristics of saving land, significant reduction effect, and waste heat can be recycled.

[0003] At present, most of the existing county-level waste incineration projects are small-scale domestic waste incineration projects with a capacity of less than 200 tons. Such projects have the characteristics of high investment per ton and small land area, which puts forward high requirements on investment cost and occupied area. As an important part of domestic waste incineration projects, the power supply system has a large land area and high investment costs of electrical equipment such as communication cables and switch cabinets, which have also become problems that need to be solved urgently. Utility Model Content

[0004] In view of this, the utility model provides a power supply system for a small incineration power plant, the main purpose of which is to improve the problem that the power supply system of the existing incineration power generation project occupies a large area and has a high cost.

[0005] According to one aspect of the utility model, a power supply system for a small incineration power plant is provided, comprising:

[0006] The first transformer, the second transformer, the first high-voltage switchgear, the second high-voltage switchgear, the first low-voltage incoming line cabinet, the second low-voltage incoming line cabinet, the intermediate switchgear, a section of low-voltage power supply bus, a second section of low-voltage power supply bus, a low-voltage enclosed power supply bus bridge, and a high-voltage power supply bus;

[0007] The first high-voltage switch cabinet, the first transformer, and the first low-voltage incoming line cabinet are connected in series between the high-voltage power supply bus and the section of low-voltage power supply bus;

[0008] The second high-voltage switch cabinet, the second transformer, and the second low-voltage incoming line cabinet are connected in series between the high-voltage power supply bus and the second-section low-voltage power supply bus;

[0009] The low-voltage enclosed power supply bus bridge and the intermediate switch cabinet are connected in series between the first section of the low-voltage power supply bus and the second section of the low-voltage power supply bus;

[0010] The one section of low-voltage power supply bus and the two sections of low-voltage power supply bus are used to supply power to low-voltage power loads;

[0011] The intermediate switch cabinet is used to switch the power supply transformer of the one-section low-voltage power supply bus or the two-section low-voltage power supply bus.

[0012] Preferably, the system further comprises a generator set;

[0013] The output end of the generator set is electrically connected to the high-voltage power supply bus.

[0014] Preferably, the generator set is a steam turbine generator set.

[0015] Preferably, the generator set is not equipped with a separate starting power supply.

[0016] Preferably, the system further comprises a high voltage distribution cabinet;

[0017] The output end of the high-voltage power distribution cabinet is electrically connected to the input end of the high-voltage power load, and is used to supply power to the high-voltage power load, wherein the high-voltage power load includes an induced draft fan.

[0018] Preferably, the system further comprises a low voltage distribution cabinet;

[0019] The input end of the low-voltage power distribution cabinet is electrically connected to the one-stage low-voltage power supply bus or the two-stage low-voltage power supply bus;

[0020] The output end of the low-voltage power distribution cabinet is electrically connected to the low-voltage power load.

[0021] Preferably, the first transformer and the second transformer are both step-down transformers with a rated capacity of 1250 kVA or 1600 kVA.

[0022] Preferably, the intermediate switch cabinet includes a self-closing relay, and the self-closing relay is used to automatically connect the low-voltage closed power supply bus bridge when the first transformer or the second transformer is shut down.

[0023] Preferably, the low-voltage power load includes a garbage hoisting device, an incinerator, a slag machine, a slag crane, and a boiler.

[0024] By means of the above technical solution, the technical solution provided by the embodiment of the utility model has at least the following advantages:

[0025] The utility model provides a power supply system of a small incineration power plant. Compared with the prior art, the utility model embodiment is connected in series between the high-voltage power supply bus and the one-stage low-voltage power supply bus through the first high-voltage switch cabinet, the first transformer, and the first low-voltage incoming line cabinet; the second high-voltage switch cabinet, the second transformer, and the second low-voltage incoming line cabinet are connected in series between the high-voltage power supply bus and the two-stage low-voltage power supply bus; the low-voltage closed power supply bus bridge and the intermediate switch cabinet are connected in series between the one-stage low-voltage power supply bus and the two-stage low-voltage power supply bus; the one-stage low-voltage power supply bus and the two-stage low-voltage power supply bus are used to supply power to low-voltage power loads; the intermediate switch cabinet is used to switch the power supply transformer of the one-stage low-voltage power supply bus or the two-stage low-voltage power supply bus, while satisfying the mutual backup of the transformers, reducing the number of transformers, switch cabinets and related cables, thereby reducing the floor space and investment cost of the power supply system.

[0026] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A schematic diagram showing the structure of a power supply system of a small incineration power plant provided by an embodiment of the utility model is shown;

[0029] Figure 2 The present invention shows a schematic diagram of the structure of the power supply system of a small-scale incineration power plant in the prior art. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0031] The utility model embodiment provides a power supply system for a small incineration power plant, such as Figure 1 As shown, including:

[0032] A first transformer 101, a second transformer 102, a first high-voltage switchgear 103, a second high-voltage switchgear 104, a first low-voltage incoming line cabinet 105, a second low-voltage incoming line cabinet 106, an intermediate switchgear 107, a first section of low-voltage power supply bus 108, a second section of low-voltage power supply bus 109, a low-voltage enclosed power supply bus bridge 110, and a high-voltage power supply bus 111.

[0033] Among them, the first high-voltage switch cabinet 103, the first transformer 101, and the first low-voltage incoming line cabinet 105 are connected in series between the high-voltage power supply bus 111 and a section of low-voltage power supply bus 108 to form a first low-voltage power supply section. In this first low-voltage power supply section, the first high-voltage switch cabinet 103 is used to control the on-off of the circuit between the high-voltage power supply bus 111 and the input end of the first transformer 101, and the first low-voltage incoming line cabinet 105 is used to control the on-off of the circuit between the input end of the first transformer 101 and a section of low-voltage power supply bus 108. The second high-voltage switch cabinet 104, the second transformer 102, and the second low-voltage incoming line cabinet 106 are connected in series between the high-voltage power supply bus 111 and the second section of low-voltage power supply bus 109 to form a second low-voltage power supply section. In this second low-voltage power supply section, the second high-voltage switch cabinet 104 is used to control the on-off of the circuit between the high-voltage power supply bus 111 and the input end of the second transformer 102, and the second low-voltage incoming line cabinet 106 is used to control the on-off of the circuit between the input end of the second transformer 102 and the second-section low-voltage power supply bus 109.

[0034] The low-voltage enclosed power supply bus bridge 110 and the intermediate switch cabinet 107 are connected in series between a first section of low-voltage power supply bus 108 and a second section of low-voltage power supply bus 109; the first section of low-voltage power supply bus 108 and the second section of low-voltage power supply bus 109 are used to supply power to low-voltage power loads. The intermediate switch cabinet 107 is used to switch the power supply transformer of the first section of low-voltage power supply bus 108 or the second section of low-voltage power supply bus 109. For example, when the first transformer 101 needs to be repaired or fails, it is necessary to control the first high-voltage switch cabinet 103 to disconnect the circuit between the high-voltage power supply bus 111 and the input end of the first transformer 101, and control the first low-voltage incoming line cabinet 105 to disconnect the circuit between the input end of the first transformer 101 and a section of low-voltage power supply bus 108, and control the intermediate switch cabinet 107 to connect the circuit between the second section of low-voltage power supply bus 109 and a section of low-voltage power supply bus 108, that is, to connect the circuit between the output end of the second transformer 102 and a section of low-voltage power supply bus 108, so as to switch the power supply transformer of a section of low-voltage power supply bus 108 from the first transformer 101 to the second transformer 102. Among them, the low-voltage enclosed power supply bus bridge 110 is a 380V or 220V enclosed bus bridge.

[0035] It should be noted that if Figure 2The figure shows the transformer connection scheme of the existing small-scale incineration power plant power supply system. The scheme is equipped with three low-voltage plant transformers, of which two are operating transformers and the other is a standby transformer. Compared with the existing scheme, this scheme reduces one commonly used transformer, and at the same time, it reduces one 10kV high-voltage switch cabinet, one 380V low-voltage incoming line cabinet, and several connecting cables, which greatly reduces the equipment investment, thereby reducing the floor space of the power supply system and reducing the equipment investment cost.

[0036] In an embodiment of the utility model, the system further comprises a generator set;

[0037] The output end of the generator set is electrically connected to the high-voltage power supply bus.

[0038] The high-voltage power supply bus is electrically connected to the output end of the generator set inside the incineration power plant, and the 10kV high-voltage electric energy generated by the generator set supplies power to the high-voltage power supply bus, realizing an internal circulation mode in which the power used in the plant is supplied by the power generated by the plant itself.

[0039] In the embodiment of the utility model, the generator set is a steam turbine generator set.

[0040] The heat energy carried by the high-temperature flue gas generated by the incineration furnace burning garbage is converted into electrical energy through the steam turbine generator set. The output voltage of the steam turbine generator set can be 10kV.

[0041] In the embodiment of the utility model, the generator set is not equipped with a separate starting power supply.

[0042] The starting power supply of the generator set is started by the power supply system in reverse, and no separate starting power supply is provided. When the generator stops and needs to be restarted, the auxiliary equipment used to drive the generator set to work is equivalent to an electricity user, and the power supply system supplies power to the above auxiliary equipment to complete the reverse drive of the generator set and realize the function of the starting power supply.

[0043] In an embodiment of the utility model, the system further comprises a high voltage distribution cabinet;

[0044] The output end of the high-voltage power distribution cabinet is electrically connected to the input end of the high-voltage power load, and is used to supply power to the high-voltage power load.

[0045] Among them, the high-voltage power load includes the induced draft fan. Since the power voltage level of the induced draft fan is 10kV, the power supply input end of the induced draft fan is directly connected to the high-voltage power supply bus to realize the power supply of the factory induced draft fan.

[0046] In an embodiment of the utility model, the system further comprises a first low-voltage power distribution cabinet and a second low-voltage power distribution cabinet;

[0047] The input end of the first low-voltage distribution cabinet is electrically connected to a section of low-voltage power supply bus, and the input end of the second low-voltage distribution cabinet is electrically connected to a second section of low-voltage power supply bus;

[0048] The output ends of the first low-voltage power distribution cabinet and the second low-voltage power distribution cabinet are electrically connected to the low-voltage power load.

[0049] Among them, low-voltage factory motors, generally Class I motors and Class II and III motors of 75kW and above are directly powered by low-voltage distribution cabinets, centrally and automatically controlled by distributed control systems, and emergency stop control buttons are installed on site. Other small-capacity equipment is distributed by local power distribution boxes in the factory according to functional areas. Among them, low-voltage power loads include garbage hoisting devices, incinerators, slag machines, slag cranes, boilers, etc., which are not specifically limited in the embodiments of the present invention.

[0050] In the embodiment of the utility model, the first transformer and the second transformer are both step-down transformers with a rated capacity of 1250 kVA or 1600 kVA.

[0051] Among them, the low-voltage voltage level of the factory power is 380V, so a step-down transformer with a rated capacity of 1250kVA is used to convert 10kV high-voltage electricity into 380V low-voltage electricity, or a step-down transformer with a rated capacity of 1600kVA is used to convert 10kV high-voltage electricity into 380V low-voltage electricity, and supply it to a low-voltage power supply bus and a 380V distribution section of a second low-voltage power supply bus. The low-voltage electrical equipment is connected to the first power supply bus, and the low-voltage section of the factory power is connected in a single-bus segmented manner. Among them, the transformer can be a dry-type transformer (SCB epoxy resin cast dry-type transformer or SGB10 non-encapsulated H-class insulation dry-type transformer), or an oil-immersed transformer, which is not specifically limited in the embodiments of the present invention.

[0052] In an embodiment of the utility model, the intermediate switch cabinet includes a self-closing relay.

[0053] Among them, the automatic switching relay is used to automatically connect the low-voltage closed power supply bus bridge when the first transformer or the second transformer is shut down. That is, the first transformer and the second transformer are backup for each other. During normal operation, both transformers are in operation. When one of the transformers fails or needs to be shut down, the automatic switching relay automatically controls the current transformer's power load to be transferred to the output end of the other transformer.

[0054] The utility model provides a power supply system of a small incineration power plant. Compared with the prior art, the utility model embodiment is connected in series between the high-voltage power supply bus and the one-stage low-voltage power supply bus through the first high-voltage switch cabinet, the first transformer, and the first low-voltage incoming line cabinet; the second high-voltage switch cabinet, the second transformer, and the second low-voltage incoming line cabinet are connected in series between the high-voltage power supply bus and the two-stage low-voltage power supply bus; the low-voltage closed power supply bus bridge and the intermediate switch cabinet are connected in series between the one-stage low-voltage power supply bus and the two-stage low-voltage power supply bus; the one-stage low-voltage power supply bus and the two-stage low-voltage power supply bus are used to supply power to low-voltage power loads; the intermediate switch cabinet is used to switch the power supply transformer of the one-stage low-voltage power supply bus or the two-stage low-voltage power supply bus, while satisfying the mutual backup of the transformers, reducing the number of transformers, switch cabinets and related cables, thereby reducing the floor space and investment cost of the power supply system.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element 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.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A power supply system for a small incineration power plant, characterized in that: include: The first transformer, the second transformer, the first high-voltage switchgear, the second high-voltage switchgear, the first low-voltage incoming line cabinet, the second low-voltage incoming line cabinet, the intermediate switchgear, a section of low-voltage power supply bus, a second section of low-voltage power supply bus, a low-voltage enclosed power supply bus bridge, and a high-voltage power supply bus; The first high-voltage switch cabinet, the first transformer, and the first low-voltage incoming line cabinet are connected in series between the high-voltage power supply bus and the section of low-voltage power supply bus; The second high-voltage switch cabinet, the second transformer, and the second low-voltage incoming line cabinet are connected in series between the high-voltage power supply bus and the second-section low-voltage power supply bus; The low-voltage enclosed power supply bus bridge and the intermediate switch cabinet are connected in series between the first section of the low-voltage power supply bus and the second section of the low-voltage power supply bus; The one section of low-voltage power supply bus and the two sections of low-voltage power supply bus are used to supply power to low-voltage power loads; The intermediate switch cabinet is used to switch the power supply transformer of the one-section low-voltage power supply bus or the two-section low-voltage power supply bus.

2. The power supply system of a small incineration power plant according to claim 1, characterized in that: The system also includes a generator set; The output end of the generator set is electrically connected to the high-voltage power supply bus.

3. The power supply system of a small incineration power plant according to claim 2, characterized in that: The generator set is a steam turbine generator set.

4. The power supply system of a small incineration power plant according to claim 3, characterized in that: The generator set is not equipped with a separate starting power supply.

5. The power supply system of a small incineration power plant according to claim 1, characterized in that: The system also includes a high voltage distribution cabinet; The output end of the high-voltage power distribution cabinet is electrically connected to the input end of the high-voltage power load, and is used to supply power to the high-voltage power load, wherein the high-voltage power load includes an induced draft fan.

6. The power supply system of a small incineration power plant according to claim 5, characterized in that: The system also includes a first low-voltage power distribution cabinet and a second low-voltage power distribution cabinet; The input end of the first low-voltage power distribution cabinet is electrically connected to the one-stage low-voltage power supply busbar, and the input end of the second low-voltage power distribution cabinet is electrically connected to the two-stage low-voltage power supply busbar; The output ends of the first low-voltage power distribution cabinet and the second low-voltage power distribution cabinet are electrically connected to the low-voltage power load.

7. The power supply system of a small incineration power plant according to claim 1, characterized in that: The first transformer and the second transformer are both step-down transformers with a rated capacity of 1250 kVA or 1600 kVA.

8. The power supply system of a small incineration power plant according to claim 1, characterized in that: The intermediate switch cabinet includes an automatic relay, which is used to automatically connect the low-voltage closed power supply bus bridge when the first transformer or the second transformer is shut down.

9. The power supply system of a small incineration power plant according to any one of claims 1 to 8, characterized in that: The low-voltage power load includes a garbage hoisting device, an incinerator, a slag machine, a slag crane, and a boiler.

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