Bed material energy storage system capable of being coupled with circulating fluidized bed boiler

Abstract

The utility model relates to a bed material energy storage system capable of being coupled with a circulating fluidized bed boiler. The bed material energy storage system comprises a cyclone separator, a material returning device and a multi-bin energy storage bubbling bed. Wherein the cyclone separator can be a separator in an original unit, the cyclone separator mainly plays a role in gas-solid separation, under the action of centrifugal force, bed materials are rotationally separated to the bottom along the outer wall of the cyclone separator, and flue gas leaves the separator from a center cylinder of the cyclone separator and enters a tail flue of the boiler. And the bed material separated by the cyclone separator enters the material returning device through the vertical pipe. Bed materials in the material returning device enter the multi-branch-bin energy storage bubbling bed, and heating and heat release are achieved on the bed materials through the multi-branch-bin energy storage bubbling bed. The utility model mainly aims to provide a bed material energy storage method capable of being coupled with a circulating fluidized bed boiler, so that the huge heat storage capacity of the bed material of the circulating fluidized bed boiler can be fully utilized.

Description

Technical Field

[0001] The utility model relates to a circulating fluidized bed boiler, in particular to a bed material energy storage method that can be coupled with the circulating fluidized bed boiler. Background Art

[0002] With the continuous growth of fluctuating and intermittent renewable energy generation, the power system requires greater flexibility to accommodate variable renewable energy. Technological advances are now requiring thermal power plants to provide a wider range of peak and valley pressure reduction capabilities. For thermal power units providing high-parameter industrial steam, ensuring stable industrial steam supply imposes upper load limits, impacting capacity pricing and peak-shaving revenue. Furthermore, the lower load limit is constrained by environmental parameter adjustments at low boiler loads. Circulating fluidized bed boiler ash circulation systems offer significant heat storage capacity, but current technological limitations prevent them from being effective in peak and valley pressure reduction. Utility Model Content

[0003] The main purpose of the utility model is to provide a bed material energy storage system that can be coupled with a circulating fluidized bed boiler, so as to fully utilize the huge heat storage capacity of the bed material of the circulating fluidized bed boiler.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a bed material energy storage system that can be coupled with a circulating fluidized bed boiler, including a cyclone separator, a return material device and a multi-compartment energy storage bubbling bed, wherein the air inlet of the cyclone separator is connected to the furnace, and the discharge port of the cyclone separator is connected to the return material device through a vertical pipe. The return material device is provided with a No. 1 compartment and a No. 2 compartment, the No. 1 compartment is connected to the external bed through a No. 1 conical valve, and the No. 2 compartment is connected to the multi-compartment energy storage bubbling bed through a No. 2 conical valve, and each compartment in the multi-compartment energy storage bubbling bed is respectively provided with an industrial steam supply heating surface, which can heat the water vapor in the steam-water system.

[0005] Preferably, the steam-water system includes a deaerator water tank, an energy storage water supply pump, an energy storage steam-water separator, an energy storage circulating water pump and an energy storage bottom header. The water in the deaerator water tank is pressurized by the energy storage water supply pump and then replenished into the energy storage steam-water separator. The energy storage steam-water separator circulates the separated water to the energy storage bottom header through the energy storage circulating water pump. The water in the energy storage bottom header is heated by the heating surface in the multi-compartment energy storage bubbling bed to form saturated steam and saturated water to the energy storage steam-water separator.

[0006] The beneficial effects of the utility model are:

[0007] 1. Improve energy efficiency:

[0008] When the unit is under low load or requires deep peak regulation, thermal energy is stored in a multi-compartment energy storage bubbling bed. When the unit is in the high load stage, the stored thermal energy is used to heat the steam generated by the steam-water system to meet industrial steam supply needs. This can avoid energy waste and improve overall energy utilization efficiency.

[0009] 2. Enhance the peak load regulation capability of the units:

[0010] The method of the utility model uses bed material energy storage to enable the unit to more flexibly adjust energy output when the load changes, especially during deep peak regulation, and can provide stable thermal energy support, thereby enhancing the peak regulation capability and operational stability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0012] Figure 1 It is a flow chart of the material circulation of the utility model;

[0013] Figure 2 This is a flow chart of the soda system of the present utility model.

[0014] Description of Reference Numerals

[0015] 1. Circulating fluidized bed boiler primary air chamber; 2. Furnace; 3. Cyclone separator;

[0016] 4. Standpipe; 5. Return feeder; 6. Cone valve No. 2; 7. Cone valve No. 1;

[0017] 8. Return pipe of return device;

[0018] 11. Ash channel at the entrance of multi-storage energy storage bubbling bed; 12. Industrial steam supply heating surface 1;

[0019] 13. Industrial steam supply heating surface 2; 14. Industrial steam supply heating surface 3;

[0020] 101. Deaerator water tank; 102. Energy storage water supply pump;

[0021] 103. Energy storage steam-water separator; 104. Energy storage circulating water pump;

[0022] 105. Energy storage bottom header; 106. Multi-compartment energy storage bubbling bed wrapped wall tube evaporation heating surface;

[0023] 108. Energy storage first-stage desuperheater; 110. Energy storage second-stage desuperheater;

[0024] 112. Energy storage industrial steam supply pressure regulating valve; 113. Original industrial steam supply pipeline. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] like Figure 1 and Figure 2 As shown, this embodiment provides a bed material energy storage system that can be coupled with a circulating fluidized bed boiler, including a cyclone separator 3, a recycler 5, and a multi-bin energy storage bubbling bed 10. Among them, the cyclone separator 3 can adopt the separator in the original unit. The cyclone separator 3 mainly plays the role of gas-solid separation. Under the action of centrifugal force, the bed material (and circulating ash, the circulating fluidized bed boiler primary air chamber 1 is blown into the furnace 2, the ash in the furnace 2 enters the cyclone separator 3, and the ash is separated by the cyclone separator 3 to form bed material) rotates and separates to the bottom along the outer wall of the cyclone separator 3, and the flue gas leaves the separator from the central tube of the cyclone separator 3 and enters the boiler tail flue. The bed material separated by the cyclone separator 3 enters the recycler 5 through the riser 4. In this embodiment, a No. 1 conical valve 7 and a No. 2 conical valve 6 are respectively installed at each end of the return feeder 5. A No. 1 chamber and a No. 2 chamber are located within the return feeder 5. The No. 1 chamber is connected to the external bed via the No. 1 conical valve 7, while the No. 2 chamber is connected to the No. 2 conical valve 6. The No. 2 conical valve 6 is connected to the multi-bin energy storage bubbling bed 10 via the inlet ash duct 11. Through the double-conical valve return feeder 5, bed material flows smoothly from the cyclone separator 3 to the furnace 2, while flue gas in the furnace 2 is prevented from flowing back into the cyclone separator 3. Furthermore, the double-conical valve return feeder 5 can flexibly distribute the amount of bed material entering the external bed and the multi-bin energy storage bubbling bed 10. By controlling the opening of the No. 1 conical valve 7, the amount of bed material entering the external bed is controlled, thereby achieving control over both the bed temperature and the steam temperature. By controlling the second cone valve 6, that is, controlling the bed material flow entering the multi-compartment energy storage bubbling bed 10, that is, controlling the energy storage rate, it is also possible to ensure that the bed temperature in the furnace 2 changes gently without affecting the normal operation of the boiler.

[0027] An industrial steam supply heating surface is arranged in the multi-compartment energy storage bubbling bed 10, which can heat the steam of the steam-water system. The steam-water system is connected to the original industrial steam supply pipeline 113 through the energy storage industrial steam supply pipeline.

[0028] During the heating phase, i.e., when the unit is under low load or requires deep peak regulation, each compartment of the multi-compartment energy storage bubbling bed 10 is ventilated to enter the bubbling bed state, and the industrial steam supply entering the multi-compartment energy storage bubbling bed 10 maintains a minimum cooling flow rate. Then, the bed material amount in the multi-compartment energy storage bubbling bed 10 is gradually increased by controlling the No. 2 cone valve 6. At the same time, the bed material temperature is gradually increased by heating the industrial steam supply heating surface. When the bed material temperature in the multi-compartment energy storage bubbling bed 10 approaches the bed material temperature in the return feeder 5, the No. 2 cone valve 6 is closed. Next, the fluidization dampers of each compartment of the multi-division energy storage bubbling bed 10 are closed to stop the fluidization of the bed material in the multi-division energy storage bubbling bed 10. At the same time, the industrial gas supply entering the multi-division energy storage bubbling bed 10 is maintained at the minimum cooling flow rate for 20 minutes, and then the energy storage industrial steam supply pipeline is closed. Finally, when a cooling ash shell is formed around the industrial steam supply heating surface in the multi-division energy storage bubbling bed 10, the heating of the industrial steam supply heating surface of the multi-division energy storage bubbling bed 10 is stopped, so that the multi-division energy storage bubbling bed 10 enters the energy storage stage.

[0029] During the heat release phase, that is, when the unit is in the high-load phase, first, the energy storage industrial steam supply pipeline entering the multi-storage energy storage bubbling bed 10 is opened, and then the fluidizing dampers of each compartment of the multi-storage energy storage bubbling bed 10 are ventilated, so that the multi-storage energy storage bubbling bed 10 enters the bubbling bed state; then, the industrial steam supply circuit provided by the unit's exhaust is cut off, and the hot bed material of the multi-storage energy storage bubbling bed 10 is used to heat the steam generated by the steam-water system to meet the industrial steam supply. In addition, when the unit is in the high-load phase, as the temperature of the bed material in the multi-storage energy storage bubbling bed 10 gradually decreases, the industrial steam supply circuit provided by the unit's exhaust is opened, and the steam production of the multi-storage energy storage bubbling bed 10 is mixed with the industrial steam supply in the industrial steam supply circuit provided by the unit's exhaust to supply steam together. When the bed material temperature in the multi-storage energy storage bubbling bed 10 drops to a preset temperature, the heat release phase ends, and the multi-storage energy storage bubbling bed 10 re-enters the energy storage phase. That is, when the demand for industrial steam supply is low, only the multi-compartment energy storage bubbling bed 101 can be fluidized, with industrial steam supply heating surface 12 activated, and combined with the energy storage primary desuperheater 108 to maintain the steam supply temperature. As the bed material temperature in the multi-compartment energy storage bubbling bed 101 decreases, and when the industrial steam supply temperature requirement cannot be met, the multi-compartment energy storage bubbling bed 102 is fluidized in turn, and the energy storage secondary desuperheater 110 is coordinated to reduce the water temperature, controlling the industrial steam supply temperature to meet user needs. This is achieved by activating industrial steam supply heating surface 2 13. Similarly, the multi-compartment energy storage bubbling bed 103 can be activated as needed, enabling industrial steam supply heating surface 3 14 to operate. This solution increases energy storage time while reducing fluidization wind energy consumption. When the heat release phase ends, the energy storage industrial steam supply pressure regulating valve 112 is closed.

[0030] In this embodiment, the steam-water system includes a deaerator water tank 101, an energy storage water supply pump 102, an energy storage steam-water separator 103, an energy storage circulating water pump 104, and an energy storage bottom header 105. The water in the deaerator water tank 101 is pressurized by the energy storage water supply pump 102 and then replenished into the energy storage steam-water separator 103. The energy storage steam-water separator 103 circulates the separated water to the energy storage bottom header 105 via the energy storage circulating water pump 104. The water in the energy storage bottom header 105 is heated by the evaporation and heating surface 106 of the wall-wrapped tubes of the multi-compartment energy storage bubbling bed 10, forming saturated steam and saturated water that are then transported to the energy storage steam-water separator 103. The evaporation and heating surface 106 of the wall-wrapped tubes constitutes the outer wall structure of the multi-compartment energy storage bubbling bed 10, is sprayed with wear-resistant paint, and is wrapped with insulation material and an iron shell. After separation in the energy storage steam-water separator 103, the saturated steam enters the industrial steam supply heating surface 12 and is heated to superheated steam that meets the requirements of industrial users. When the superheated steam temperature exceeds the user's requirements, the industrial steam supply temperature is controlled by the energy storage primary desuperheater 108. Simultaneously, the industrial steam supply pressure is controlled to meet the user's requirements by the industrial steam supply pressure regulating valve and the variable frequency energy storage industrial steam and water supply pump. The steam then merges with the original industrial steam supply pipeline 113 and is supplied to the user.

[0031] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A bed material energy storage system capable of being coupled with a circulating fluidized bed boiler, characterized in that: It includes a cyclone separator, a recycler and a multi-compartment energy storage bubbling bed, wherein the air inlet of the cyclone separator is connected to the furnace, the discharge port of the cyclone separator is connected to the recycler through a vertical pipe, and the recycler is provided with a No. 1 compartment and a No. 2 compartment, the No. 1 compartment is connected to the external bed through a No. 1 conical valve, and the No. 2 compartment is connected to the multi-compartment energy storage bubbling bed through a No. 2 conical valve, and each compartment in the multi-compartment energy storage bubbling bed is respectively provided with an industrial steam supply heating surface, and the industrial steam supply heating surface can heat the water vapor in the steam-water system.

2. A bed material energy storage system capable of being coupled with a circulating fluidized bed boiler according to claim 1, characterized in that: The steam-water system includes a deaerator water tank, an energy storage water supply pump, an energy storage steam-water separator, an energy storage circulating water pump and an energy storage bottom header. The water in the deaerator water tank is pressurized by the energy storage water supply pump and then replenished into the energy storage steam-water separator. The energy storage steam-water separator circulates the separated water to the energy storage bottom header through the energy storage circulating water pump. The water in the energy storage bottom header is heated by the heating surface in the multi-compartment energy storage bubbling bed to form saturated steam and saturated water that are sent to the energy storage steam-water separator.

Images