A self-heating operation control method based on ARF mode and chemical looping combustion system

Abstract

The present invention relates to a self-heating operation control method and a chemical loop combustion system based on an ARF mode. The method comprises the following steps: Step 1, obtaining a heat load instruction requirement, controlling the fuel feed amount of the combustion reactor, and causing the temperature of the combustion reactor to change with the increase or decrease of the fuel amount; Step 2, if the temperature of the combustion reactor deviates from the set value, increasing or decreasing the circulation flow rate of the oxygen carrier is adjusted to increase or decrease the temperature of the combustion reactor to maintain the stability of the temperature of the combustion reactor; Step 3, increasing or decreasing the temperature of the air reactor by adjusting the circulation flow rate of the oxygen carrier to increase or decrease the temperature of the air reactor, so that the air reactor changes synchronously with the changes of the combustion reactor, and finally meeting the heat load instruction requirement. The present invention can prioritize the smooth operation of the chemical loop combustion system, and when the load changes, the temperature of the fuel reactor quickly reaches a stable state, thereby maintaining the self-heating stable operation of the chemical loop combustion system.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical looping combustion automatic control, and in particular relates to a self-heating operation control method based on an ARF mode and a chemical looping combustion system. Background Art

[0002] Chemical Looping Combustion (CLC) technology uses an oxygen carrier (OC) prepared from solid particles of metal oxides, which circulates between an air reactor (AR) and a fuel reactor (FR), transferring oxygen in the air to the fuel reactor in the form of lattice oxygen to react chemically with the fuel. Since the fuel does not come into contact with the air during the entire chemical looping combustion process, the carbon dioxide produced by combustion will not be diluted by other gases in the air (mainly nitrogen). Therefore, the carbon dioxide concentration at the outlet of the fuel reactor can reach more than 90%. There is no need to separate carbon dioxide from other gases and then capture them, and the carbon dioxide produced by the combustion reaction can be captured at low cost and low energy consumption. In summary, chemical looping combustion technology is a new combustion technology that can significantly reduce carbon dioxide emissions at low cost under the increasingly urgent situation of dual carbon requirements.

[0003] The oxygen carrier oxidation reaction in the AR is an exothermic reaction, while the fuel gasification and oxygen carrier reduction reaction in the FR is an endothermic reaction. During normal operation, the heat carrying capacity of the oxygen carrier is utilized to maintain the normal operating temperature of each reactor as it circulates between the FR and AR.

[0004] At present, most chemical looping devices use external heat sources (natural gas or electric heating) to maintain the temperature of AR and FR reactors to ensure the normal operation of the chemical looping device, and self-heating operation has not been achieved. The core problem is the inability to control the thermal balance between FR and AR reactors. Summary of the Invention

[0005] The purpose of the present invention is to provide a self-heating operation control method and a chemical looping combustion system based on the ARF method, so as to realize the self-heating operation of the chemical looping combustion system.

[0006] The present invention provides a self-heating operation control method based on the ARF method, comprising the following steps:

[0007] Step 1: Obtain heat load instruction requirements and control the fuel feed rate of the combustion reactor so that the temperature of the combustion reactor changes with the increase or decrease of the fuel amount;

[0008] Step 2: if the temperature of the combustion reactor deviates from the set value, the temperature of the combustion reactor is increased or decreased by adjusting the circulation flow rate of the oxygen carrier to maintain the stability of the temperature of the combustion reactor;

[0009] Step 3: by adjusting the oxygen carrier circulation flow rate to increase or decrease, the temperature of the air reactor is increased or decreased, so that the air reactor changes synchronously with the changes of the combustion reactor, and finally meets the heat load instruction requirement.

[0010] Furthermore, in step 1, the heat load controller obtains the heat load instruction requirement and issues a control instruction.

[0011] Furthermore, in step 1, the fuel control valve obtains the control instruction issued by the heat load controller to control the fuel feed amount of the combustion reactor.

[0012] Furthermore, in step 2, the fuel reactor temperature controller determines whether the temperature of the combustion reactor deviates from the set value, and if so, issues a control instruction.

[0013] Furthermore, in step 2, the oxygen carrier circulation flow control valve obtains a control instruction issued by the fuel reactor temperature controller to adjust the increase or decrease of the oxygen carrier circulation flow.

[0014] Furthermore, in step 1, when the heat load instruction is 4 MWth, the fuel feed rate is 0.8-1.2 t / h.

[0015] Furthermore, in step 2, the temperature setting value of the fuel reactor is 950° C., the flow rate is maintained at 1.5-2.5 m / s, the oxygen carrier circulation flow rate is 150-200 t / h, and the flow rate is maintained at 9-10 m / s.

[0016] The present invention also provides a chemical looping combustion system, comprising a combustion reactor, an air reactor, a heat load controller, a fuel control valve, a fuel reactor temperature controller, and an oxygen carrier circulation flow control valve; the heat load controller is connected to the combustion reactor via the fuel control valve; the combustion reactor and the air reactor are connected via the oxygen carrier circulation flow control valve; the combustion reactor is connected to the oxygen carrier circulation flow control valve via the fuel reactor temperature controller;

[0017] The heat load controller is used to obtain heat load instruction requirements and issue control instructions;

[0018] The fuel control valve is used to obtain the control instruction issued by the heat load controller, control the fuel feeding amount of the combustion reactor, and make the temperature of the combustion reactor change with the increase or decrease of the fuel amount;

[0019] The fuel reactor temperature controller is used to determine whether the temperature of the combustion reactor deviates from the set value, and if so, to issue a control instruction;

[0020] The oxygen carrier circulation flow control valve is used to obtain the control instruction issued by the fuel reactor temperature controller, adjust the increase or decrease of the oxygen carrier circulation flow rate, increase or decrease the temperature of the combustion reactor, and maintain the stability of the combustion reactor temperature;

[0021] The oxygen carrier circulation flow control valve is also used to increase or decrease the temperature of the air reactor while adjusting the oxygen carrier circulation flow, so that the air reactor changes synchronously with the changes of the combustion reactor and finally meets the heat load instruction requirements.

[0022] Furthermore, the heat load controller adopts a proportional-integral controller.

[0023] Furthermore, the fuel reactor temperature controller adopts a proportional-integral controller.

[0024] The above-described scheme, utilizing an ARF-based autothermal operation control method and chemical looping combustion system, prioritizes stable operation of the chemical looping combustion system and rapidly stabilizes the fuel reactor temperature during load fluctuations, maintaining the system's autothermal stable operation. Furthermore, the load response speed achieved in this tracking method utilizes the fuel reactor's heat storage capacity, allowing for rapid partial load adjustments within the allowable temperature fluctuation range of the fuel reactor.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of a self-heating operation control method based on the ARF method of the present invention;

[0027] Figure 2 This is a structural diagram of the chemical looping combustion system of the present invention. DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0029] Ginseng Figure 1As shown, this embodiment provides a self-heating operation control method based on ARF (Air Reactor Follow Mode, ARF, air reactor tracking mode), including the following steps:

[0030] Step S1, obtaining a heat load instruction requirement, controlling the fuel feed rate of the combustion reactor, and making the temperature of the combustion reactor change with the increase or decrease of the fuel rate;

[0031] Step S2, if the temperature of the combustion reactor deviates from the set value, the temperature of the combustion reactor is increased or decreased by adjusting the circulation flow rate of the oxygen carrier to maintain the stability of the temperature of the combustion reactor;

[0032] Step S3, by adjusting the oxygen carrier circulation flow rate to increase or decrease, the temperature of the air reactor is increased or decreased, so that the air reactor changes synchronously with the changes of the combustion reactor, and finally meets the heat load instruction requirement.

[0033] In a specific example, an adjustment instruction is output based on the deviation between the set value and the actual value. The relevant parameters are as follows: when the heat load instruction is 4MWth, the fuel feed rate is 0.8-1.2t / h, the fuel reactor temperature setting value is 950℃, the flow rate is maintained at 1.5-2.5m / s, the oxygen carrier circulation flow rate is 150-200t / h, and the flow rate is maintained at 9-10m / s.

[0034] Ginseng Figure 2 As shown, this embodiment also provides a chemical looping combustion system, wherein:

[0035] LOAD: heat load

[0036] LS: Heat load command

[0037] LC: Thermal load controller (proportional-integral controller)

[0038] FL_V: Fuel control valve

[0039] FRS: Fuel reactor temperature setpoint

[0040] TC: Fuel reactor temperature controller (proportional-integral controller)

[0041] OC_V: Oxygen carrier circulation flow control valve

[0042] FR: Combustion Reactor

[0043] AR: Air reactor.

[0044] The heat load controller is connected to the combustion reactor through the fuel control valve; the combustion reactor and the air reactor are connected through the oxygen carrier circulation flow control valve; the combustion reactor is connected to the oxygen carrier circulation flow control valve through the fuel reactor temperature controller;

[0045] The heat load controller is used to obtain heat load instruction requirements and issue control instructions;

[0046] The fuel control valve is used to obtain the control instruction issued by the heat load controller, control the fuel feeding amount of the combustion reactor, and make the temperature of the combustion reactor change with the increase or decrease of the fuel amount;

[0047] The fuel reactor temperature controller is used to determine whether the temperature of the combustion reactor deviates from the set value, and if so, to issue a control instruction;

[0048] The oxygen carrier circulation flow control valve is used to obtain the control instruction issued by the fuel reactor temperature controller, adjust the increase or decrease of the oxygen carrier circulation flow rate, increase or decrease the temperature of the combustion reactor, and maintain the stability of the combustion reactor temperature;

[0049] The oxygen carrier circulation flow control valve is also used to increase or decrease the temperature of the air reactor while adjusting the oxygen carrier circulation flow, so that the air reactor changes synchronously with the changes of the combustion reactor and finally meets the heat load instruction requirements.

[0050] First, based on the heat load command (LS), the heat load controller (LC) issues a command to adjust the fuel flow rate to the FR by adjusting the fuel control valve (FL_V). The temperature of the FR will change as the fuel flow rate increases or decreases.

[0051] At this time, the fuel reactor temperature controller (TC) continuously changes the opening of the oxygen carrier circulation flow control valve (OC_V) according to the size of the FR temperature deviation from the set value (FRS), adjusting the increase or decrease of the oxygen carrier circulation flow to maintain the stability of the FR temperature.

[0052] The increase or decrease of the oxygen carrier circulation flow rate will increase or decrease the temperature of the AR, thereby adapting to the needs of the heat load instruction and ultimately meeting the heat load instruction requirements.

[0053] From this we can see that this control method is to first let FR track the needs of the external load, and then make AR change synchronously with the changes in FR. Therefore, it is called the "air reactor following" control method.

[0054] This control method prioritizes the smooth operation of the chemical looping combustion system and rapidly stabilizes the fuel reactor temperature during load fluctuations, maintaining the system's self-heating and stable operation. Furthermore, this tracking method improves load response speed by leveraging the fuel reactor's thermal storage capacity. Within the acceptable temperature fluctuation range, this thermal storage capacity allows for rapid partial load adjustments.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A self-heating operation control method based on ARF mode, characterized in that: The steps include: Step 1: Obtain heat load instruction requirements and control the fuel feed rate of the combustion reactor so that the temperature of the combustion reactor changes with the increase or decrease of the fuel amount; Step 2: if the temperature of the combustion reactor deviates from the set value, the temperature of the combustion reactor is increased or decreased by adjusting the circulation flow rate of the oxygen carrier to maintain the stability of the temperature of the combustion reactor; Step 3: by adjusting the oxygen carrier circulation flow rate to increase or decrease, the temperature of the air reactor is increased or decreased, so that the air reactor changes synchronously with the changes of the combustion reactor, and finally meets the heat load instruction requirement.

2. The self-heating operation control method based on the ARF method according to claim 1 is characterized in that: In step 1, the heat load controller obtains the heat load instruction requirement and issues a control instruction.

3. The self-heating operation control method based on the ARF method according to claim 2 is characterized in that: In step 1, the fuel control valve obtains the control instruction issued by the heat load controller to control the fuel feed amount of the combustion reactor.

4. The self-heating operation control method based on the ARF method according to claim 3 is characterized in that: In step 2, the fuel reactor temperature controller determines whether the temperature of the combustion reactor deviates from the set value, and if so, issues a control instruction.

5. The self-heating operation control method based on the ARF method according to claim 4 is characterized in that: In step 2, the oxygen carrier circulation flow control valve obtains the control instruction issued by the fuel reactor temperature controller to adjust the increase or decrease of the oxygen carrier circulation flow.

6. The self-heating operation control method based on the ARF method according to claim 1 is characterized in that: In step 1, when the heat load instruction is 4MWth, the fuel feed rate is 0.8-1.2t / h.

7. The self-heating operation control method based on the ARF method according to claim 6, characterized in that: In step 2, the temperature setting value of the fuel reactor is 950° C., the flow rate is maintained at 1.5-2.5 m / s, the circulation flow rate of the oxygen carrier is 150-200 t / h, and the flow rate is maintained at 9-10 m / s.

8. A chemical looping combustion system, characterized in that: It includes a combustion reactor, an air reactor, a heat load controller, a fuel control valve, a fuel reactor temperature controller, and an oxygen carrier circulation flow control valve; the heat load controller is connected to the combustion reactor through the fuel control valve; the combustion reactor and the air reactor are connected through the oxygen carrier circulation flow control valve; the combustion reactor is connected to the oxygen carrier circulation flow control valve through the fuel reactor temperature controller; The heat load controller is used to obtain heat load instruction requirements and issue control instructions; The fuel control valve is used to obtain the control instruction issued by the heat load controller, control the fuel feeding amount of the combustion reactor, and make the temperature of the combustion reactor change with the increase or decrease of the fuel amount; The fuel reactor temperature controller is used to determine whether the temperature of the combustion reactor deviates from the set value, and if so, to issue a control instruction; The oxygen carrier circulation flow control valve is used to obtain the control instruction issued by the fuel reactor temperature controller, adjust the increase or decrease of the oxygen carrier circulation flow rate, increase or decrease the temperature of the combustion reactor, and maintain the stability of the combustion reactor temperature; The oxygen carrier circulation flow control valve is also used to increase or decrease the temperature of the air reactor while adjusting the oxygen carrier circulation flow, so that the air reactor changes synchronously with the changes of the combustion reactor and finally meets the heat load instruction requirements.

9. The chemical looping combustion system according to claim 8, characterized in that: The heat load controller adopts a proportional integral controller.

10. The chemical looping combustion system according to claim 9, characterized in that: The fuel reactor temperature controller adopts a proportional integral controller.

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