Heat storage combustion system with preheating function and inlet and outlet airflow switching method of heat storage combustion system

Abstract

The invention discloses a heat storage combustion system with a preheating function and an inlet and outlet airflow switching method of the heat storage combustion system. The system mainly comprises a heat exchanger (14), a high-temperature stop valve (15), a high-temperature regulating valve (16), a combustion chamber (1), a 1 # heat storage chamber (2), a 2 # heat storage chamber (3), a 3 # heat storage chamber (4) and inlet and outlet airflow switching devices (5, 6, 7, 8, 9, 10, 11, 12 and 13). Through the preheating systems (14, 15 and 16) of the heat storage combustion device and the reasonable control over the airflow direction when the airflow switching devices (5, 6, 7, 8, 9, 10, 11, 12 and 13) are switched, the inlet gas temperature is effectively increased, and the blow-by phenomenon between inlet high-concentration waste gas and outlet purified air is prevented, so that the efficiency of the heat storage combustion device is improved, and the removal efficiency of the waste gas is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal storage combustion, and in particular to a thermal storage combustion system with a preheating function and an inlet and outlet airflow switching method thereof. Background Art

[0002] The working principle of the heat storage combustion device is to use high-temperature oxidation reaction to convert organic matter into harmless carbon dioxide and water, and to treat pollutants in the combustion chamber. First, the high-temperature gas generated by combustion passes through a special ceramic heat storage body to heat it up and store heat. Then, the exhaust gas passes through the ceramic body that has stored heat through valve switching, transferring heat to the exhaust gas. The organic exhaust gas is switched through the lifting valve, and the ceramic is used as a heat exchanger carrier to repeatedly exchange heat, thereby saving fuel consumption when the exhaust gas is heated and reducing operating costs; In traditional heat storage combustion devices, industrial gas usually enters directly without a preheating device, and the switching sequence of the lift valves generally adopts three timings. In the first timing, the air inlet lift valve of the 1# heat storage chamber is opened, and the back-blowing and air outlet lift valves are closed; the back-blowing lift valve of the 2# heat storage chamber is opened, and the air inlet and air outlet lift valves are closed; the air outlet lift valve of the 3# heat storage chamber is opened, and the back-blowing and air inlet lift valves are closed. In the second timing, the back-blowing lift valve of the 1# heat storage chamber is opened, and the air inlet and air outlet lift valves are closed; the air outlet lift valve of the 2# heat storage chamber is opened, and the air inlet and back-blowing lift valves are closed; the air inlet lift valve of the 3# heat storage chamber is opened, and the back-blowing and air outlet lift valves are closed. In the third timing, the air outlet lift valve of the 1# heat storage chamber is opened, and the air inlet and back-blowing lift valves are closed; the air inlet lift valve of the 2# heat storage chamber is opened, and the air outlet and back-blowing lift valves are closed; the back-blowing lift valve of the 3# heat storage chamber is opened, and the air inlet and air outlet lift valves are closed; However, this method has some problems, one of which is that the intake lift valve and the outlet lift valve may complete the opening and closing action at the same time in the same box. In this case, cross-flow may occur between the intake and outlet, which may cause high-concentration exhaust gas in the intake to mix into the outlet purified gas, reducing the treatment efficiency; for this reason, we have introduced a heat storage combustion system with preheating function and its inlet and outlet airflow switching method. Summary of the invention

[0003] The object of the present invention is to provide a heat storage combustion system with a preheating function and a method for switching the inlet and outlet airflows thereof, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a thermal storage combustion system with a preheating function and a method for switching inlet and outlet airflows thereof, wherein a preheating system is added in front of a traditional thermal storage combustion device, and the preheating system indirectly heats the gas that originally directly enters the thermal storage combustion device through a heat exchanger by using the high-temperature gas in its own combustion chamber, so that the temperature of the gas that originally directly enters the thermal storage combustion device is increased to about 100 degrees Celsius, thereby reducing the humidity and low-temperature dew point corrosion performance of the gas that originally directly enters the thermal storage combustion device, and increasing the corrosion resistance and service life of the thermal storage combustion device; Secondly, the lifting valve adopts a six-time switching method: this switching method can avoid the intake lifting valve and the exhaust lifting valve from completing the switching action at the same time in the same box, so that the high-concentration exhaust gas in the intake air will not be mixed into the exhaust purified gas.

[0005] Compared with the prior art, the beneficial effects of the present invention are: through the preheating system before the heat storage combustion device and the reasonable control of the airflow direction and flow rate when the box is switched, the intake gas temperature is effectively increased and the cross-flow phenomenon between the intake high-concentration exhaust gas and the exhaust purified air is prevented, thereby improving the efficiency of the heat storage combustion device, and improving the exhaust gas removal efficiency and the service life of the device.

[0006] The six-sequence switching method of the preheating system and the lifting valve of the heat storage combustion device can be regarded as a technological advancement, which improves the corrosion resistance of the combustion device and improves the exhaust gas treatment efficiency. This improvement not only improves the overall performance of the equipment, but also helps to reduce the impact on the environment, meets the needs of modern society for sustainable development, and has good application prospects and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of a heat storage combustion system with a preheating function according to the present invention; Figure 2 A schematic diagram of a method for switching a heat storage combustion system having a preheating function according to the present invention; Figure 3 A second schematic diagram of a switching method for a heat storage combustion system having a preheating function according to the present invention; Figure 4 The third schematic diagram of the switching method of the heat storage combustion system of the preheating function of the present invention; Figure 5 A fourth schematic diagram of a method for switching a heat storage combustion system having a preheating function according to the present invention; Figure 6 A fifth schematic diagram of a method for switching a heat storage combustion system with a preheating function according to the present invention; Figure 7 Schematic diagram of the sixth method for switching the heat storage combustion system with the preheating function of the present invention.

[0008] In the figure: 1, combustion chamber; 2, 1# regenerator; 3, 2# regenerator; 4, 3# regenerator; 5, 1# regenerator blowback lift valve; 6, 1# regenerator air inlet lift valve; 7, 1# regenerator air outlet lift valve; 8, 2# regenerator blowback lift valve; 9, 2# regenerator air inlet lift valve; 10, 2# regenerator air outlet lift valve; 11, 3# regenerator blowback lift valve Lifting valve; 12. 3# heat storage chamber air inlet lifting valve; 13. 3# heat storage chamber air outlet lifting valve; 14. Heat exchanger; 15. High-temperature cut-off valve; 16. High-temperature regulating valve. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] See also Figure 1-7 The present invention provides a technical solution: a thermal storage combustion system with a preheating function and a method for switching inlet and outlet airflows thereof. The preheating system of the thermal storage combustion device uses the high-temperature purified gas in its own combustion chamber to adjust the flow through a high-temperature cut-off valve and a high-temperature regulating valve, and then indirectly heats the gas that originally directly enters the thermal storage combustion device through a plate heat exchanger, so that the temperature of the gas that originally directly enters the thermal storage combustion device is increased to about 100 degrees Celsius, thereby reducing the humidity and low-temperature dew point corrosion performance of the gas that originally directly enters the thermal storage combustion device, and increasing the corrosion resistance and service life of the thermal storage combustion device; The switching sequence of the lifting valve adopts six time sequence switching, that is, six switching methods are repeated in a cycle; the lifting valve adopts six switching methods, and the cyclic switching is as follows: The first switching method: 1# heat storage chamber: the air inlet lift valve is open, and the back-blowing and air outlet lift valves are closed; 2# heat storage chamber: the air outlet lift valve is open, and the back-blowing and air inlet lift valves are closed; 3# heat storage chamber: the back-blowing lift valve is open, and the air inlet and air outlet lift valves are closed; The second switching method: 1# heat storage chamber: the air inlet lift valve is open, and the back-blowing and air outlet lift valves are closed; 2# heat storage chamber: the back-blowing lift valve is open, and the air inlet and air outlet lift valves are closed; 3# heat storage chamber: the air outlet lift valve is open, and the back-blowing and air inlet lift valves are closed; The third switching method: 1# heat storage chamber: back-blowing lift valve is open, and air inlet and air outlet lift valves are closed; 2# heat storage chamber: air inlet lift valve is open, and back-blowing and air outlet lift valves are closed; 3# heat storage chamber: air outlet lift valve is open, and back-blowing and air inlet lift valves are closed; The fourth switching method: 1# heat storage chamber: the outlet lift valve is open, and the inlet and back-blowing lift valves are closed; 2# heat storage chamber: the inlet lift valve is open, and the back-blowing and outlet lift valves are closed; 3# heat storage chamber: the back-blowing lift valve is open, and the inlet and outlet lift valves are closed; The fifth switching method: 1# heat storage chamber: the outlet lift valve is open, and the inlet and back-blowing lift valves are closed; 2# heat storage chamber: the back-blowing lift valve is open, and the inlet and outlet lift valves are closed; 3# heat storage chamber: the inlet lift valve is open, and the back-blowing and outlet lift valves are closed; The sixth switching method: 1# heat storage chamber: back-blowing lift valve is opened, and the air inlet and outlet lift valves are closed; 2# heat storage chamber: the air outlet lift valve is opened, and the back-blowing and air inlet lift valves are closed; 3# heat storage chamber: the air inlet lift valve is opened, and the back-blowing and air outlet lift valves are closed; Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat storage combustion system with preheating function and an inlet and outlet airflow switching method thereof, characterized in that: The preheating function is mainly achieved by the high-temperature gas in the combustion chamber (1) of the heat storage combustion device passing through a high-temperature pipeline, a high-temperature cut-off valve (15), a high-temperature regulating valve (16), and then passing through a plate heat exchanger (14) to indirectly heat the gas that originally directly enters the heat storage chamber (2, 3, 4), and the heated gas passes through the inlet and outlet air flow switching device (5, 6, 7, 8, 9, 10, 11, 12, 13).

2. A heat storage combustion system with preheating function and an inlet and outlet airflow switching method thereof according to claim 1, characterized in that: The high-temperature flue needs to be opened and welded in the combustion chamber (1) of the heat storage combustion device, and a high-temperature shut-off valve (15) and a high-temperature regulating valve (16) are welded and installed on the high-temperature pipeline in sequence. The high-temperature shut-off valve (15) is a switch quantity and mainly plays the role of shutting off the high-temperature gas, and the high-temperature regulating valve (16) is an analog quantity and mainly plays the role of regulating the flow rate of the high-temperature gas. The heat exchanger adopts a plate heat exchanger (14), and the plate heat exchanger (14) mainly plays the role of indirect heating.

3. The activated carbon adsorption device for catalytic combustion gas adsorption according to claim 1, characterized in that: The airflow switching device (5, 6, 7, 8, 9, 10, 11, 12, 13) is divided into three parts. The first part is the airflow switching device (5, 6, 7) of the 1# heat storage chamber. The 1# heat storage chamber backflush lift valve (5), the 1# heat storage chamber air inlet lift valve (6), and the 1# heat storage chamber air outlet lift valve (7) are connected to the bottom of the 1# heat storage chamber (2) through a pipeline. By switching the switch states of the 1# heat storage chamber backflush lift valve (5), the 1# heat storage chamber air inlet lift valve (6), and the 1# heat storage chamber air outlet lift valve (7), the inlet and outlet of the gas into the 1# heat storage chamber (2) are changed. The second part is the airflow switching device (8, 9, 10) of the 2# heat storage chamber. The 2# heat storage chamber backflush lift valve (8), the 2# heat storage chamber air inlet lift valve (9), and the 2# heat storage chamber air outlet lift valve (7) are connected to the bottom of the 1# heat storage chamber (2) through a pipeline. The valve (10) is connected to the lower part of the 2# heat storage chamber (3) through a pipeline, and the inlet and outlet of gas into the 2# heat storage chamber (3) are changed by switching the switch states of the 2# heat storage chamber back-blowing lift valve (8), the 2# heat storage chamber air inlet lift valve (9), and the 2# heat storage chamber air outlet lift valve (10); the third part is the air flow switching device (11, 12, 13) of the 3# heat storage chamber, and the 3# heat storage chamber back-blowing lift valve (11), the 3# heat storage chamber air inlet lift valve (12), and the 3# heat storage chamber air outlet lift valve (13) are connected to the lower part of the 3# heat storage chamber (4) through a pipeline, and the inlet and outlet of gas into the 3# heat storage chamber (4) are changed by switching the switch states of the 3# heat storage chamber back-blowing lift valve (11), the 3# heat storage chamber air inlet lift valve (12), and the 3# heat storage chamber air outlet lift valve (13).

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