JPH0513698B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a regeneration device for a catalyst for refining fuel gas containing sulfides such as coal gasification gas, and in particular to prevention of deterioration in the durability of the catalyst during regeneration, and furthermore, a method for reducing heat generated during combustion treatment. It is about effective utilization.

From a long-term perspective of resource utilization, it has been proposed to gasify coal, which has large reserves, and use it for power generation and other purposes. It is necessary to purify and remove it from the viewpoint of preventing damage to the water and preventing pollution. For example, as shown in Fig. 1, in the desulfurization tower 1, a desulfurization agent such as a catalyst or a reactant containing iron, manganese, or other well-known metals, or sulfides or carbonates thereof, is used to remove hydrogen sulfide as a sulfide. At the same time, the desulfurizing agent 2a after desulfurization is brought into contact with the desulfurizing agent 2a, and is purified by removing it as a sulfide.The desulfurizing agent 2b after desulfurization is sent to the regeneration tower 3, where it is combusted and regenerated with air or oxygen-containing gas blown there. A method of reuse is adopted. In the figure, 4 is the inlet of the high-temperature gas to be purified to the desulfurization tower 1, 5 is the outlet, and 6
7 is an inlet of air or a gas containing oxygen to the regeneration tower 3, 7 is an outlet, 8 is a desulfurizing agent conveying system, and 9 is an air flow conveying device.

By the way, in the combustion treatment of sulfides in the regeneration tower 3, when a fixed bed, that is, a fixed amount of desulfurizing agent is sent intermittently to the regeneration tower 3, the combustion gas enters from the bottom and burns from the bottom to the top, as shown in Figure 1. A large amount of heat is generated as the reaction occurs. Furthermore, a device such as a moving bed that continuously transports the desulfurizing agent at a required speed similarly generates a large amount of heat. For this reason, the desulfurizing agent melts due to the generated heat, greatly reducing durability. In order to prevent this, it is desirable to use a fluidized bed, that is, to perform combustion treatment while stirring the desulfurization agent, in order to avoid deterioration in the durability of the desulfurization agent, but this method does not follow load fluctuations when used for power generation. It is difficult to perform good gas purification.
That is, in the case of a fluidized bed, a certain amount of conveying air flow is required in order to stir the desulfurization agent to be regenerated. Therefore, due to load fluctuations, the amount of fuel gas and therefore the amount of sulfide contained in the gas increases, and if the flow rate exceeds the flow rate required for stirring, it becomes difficult to perform regeneration. Gas purification will no longer be possible. However, in the past, the advantage of fixed beds and moving beds, which can quickly feed desulfurization agents to the desulfurization tower in response to load fluctuations, i.e., the amount of fuel gas, has been ignored because of the reduction in the durability of the regenerated desulfurization agent due to heat. Therefore, fluidized beds are currently being used, which have poor ability to follow load fluctuations.

The object of the present invention is to provide a regeneration method that prevents the generation of a large amount of heat during combustion processing in the regeneration tower, and enables the adoption of a moving bed in the regeneration tower that has excellent ability to follow load fluctuations. Next, the details will be explained using the drawings.

The feature of the present invention is that a heat exchanger or a heat recovery device is installed in the regeneration tower to remove a large amount of heat generated during combustion treatment in the regeneration tower of the moving bed within the temperature range in which sulfide treatment is often performed. This makes it possible to apply fixed beds and moving beds to equipment that requires the ability to follow load fluctuations, such as gasifiers for power generation.

FIG. 2 is a schematic system diagram of an embodiment of the present invention applied to desulfurization regeneration using a moving bed.
Inside, a regenerated desulfurization agent 2 consisting of a chamber 10
A plurality of conveyance paths 11 of b are formed in parallel, and at the same time, a heat exchanger 12 having a length spanning almost the entire length of the parallel conveyance paths is provided respectively, and these are connected to a heat recovery device 13. , other parts with the same reference numerals as those in FIG. 1 indicate equivalent parts.

In this way, the desulfurization agent 2b to be regenerated can be transferred to the desulfurization tower 1.
From there, it is transported within the transport system 8 in the direction of the arrow and enters the transport path 11 within the regeneration tower 3. The combustion treatment gas 14 enters from the inlet 6, passes through the side surface of the chamber 10, enters the conveyance path 11, passes through the chamber 10 one after another, and enters, for example, a sulfur recovery device (not shown) from the outlet 7. The gases 14 are brought into contact within each conveyance path 11 and subjected to combustion processing, and the heat generated at this time is collected in a heat recovery device 13 via a heat exchanger 12 and used. Therefore, even if the desulfurizing agent is moved using a moving bed, it does not generate a large amount of heat that melts the desulfurizing agent or reduces its durability, as in the case of conventional methods, and it can respond well to load fluctuations. This makes it possible to realize a gas furnace with high performance, and since the generated heat is effectively used, the thermal efficiency of the furnace can be increased.

Figure 3 shows the experimental results showing the temperature rise due to combustion treatment in the case of a fixed bed in relation to time, and shows the experimental setup using the electric furnace shown in Figure 4, which simulates a fixed bed. I used to follow him. As is clear from Fig. 3, conveyance path 1
The thickness l of the regenerated desulfurization agent 2b in 1 is 2 cm,
As the size increases to 4cm and 7cm, the temperature initially increases to 500℃.
As the combustion process progresses, the temperature reaches approximately 750°C, 1100°C, or even higher after 10 minutes, resulting in a thermal runaway state. Therefore, providing a heat recovery device to absorb the generated heat as in the present invention is important for preventing deterioration in the durability of the desulfurizing agent and for better regeneration. This will greatly contribute to the adoption of moving beds in refinery equipment.

As is clear from the above description, according to the present invention, it is possible to apply a moving bed with excellent ability to follow load fluctuations to convey the desulfurization agent in gas purification equipment, especially when coal gasification gas is used as fuel. This will greatly contribute to improving the performance of power generation gas furnaces.

[Brief explanation of the drawing]

Fig. 1 is a schematic system diagram of a conventional gas purification device, Fig. 2 is a schematic system diagram showing an embodiment of the present invention, and Fig. 3 is a schematic system diagram showing an embodiment of the present invention.
The figure is a diagram showing the relationship between temperature and time in the regeneration tower, and FIG. 4 is a schematic diagram showing the experimental equipment. DESCRIPTION OF SYMBOLS 1... Desulfurization tower, 2a, 2b... Desulfurization agent and regenerated desulfurization agent, 3... Regeneration tower, 4... High temperature fuel gas inlet, 5... Outlet, 6... Combustion processing gas inlet, 7...
...Outlet, 8...Desulfurizing agent conveyance system, 9...Air flow conveyance device, 10...Chamber, 11...Conveyance path,
12... Heat exchanger, 13... Heat recovery device, 14...
Gas for combustion processing.

Claims (1)

[Claims] 1. A moving bed type regeneration device that is provided with a conveyance path equipped with a chamber and conveys the regenerated desulfurization agent from above to the bottom by gravity, in a direction intersecting the desulfurization regeneration agent along almost the entire length of the conveyance path, The chamber is formed so that the combustion processing gas passes through it, and the combustion processing gas circulation path outside the transport path of the desulfurization agent to be regenerated has a length extending parallel to the transport path and extending almost the entire length of the transport path. A heat exchanger is provided, and the heat exchanger is configured to absorb reaction heat from the exhaust gas so that the processing temperature of the desulfurizing agent to be regenerated becomes an appropriate temperature over the entire length of the conveyance path. Desulfurization agent regeneration equipment for purifying gas containing sulfides.