JPH06184569A - High-temperature cwm feeder - Google Patents

Abstract

PURPOSE:To prevent the subject equipment from being plugged by CWM by providing a transfer pipe upstream of a CWM shut-off valve which interrupts the flow of CWM with a CWM discharge exit branching from the transfer pipe. CONSTITUTION:The objective equipment is equipped with a CWM tank 1 for storing a coal/water slurry prepared by mixing coal with water, a charge pump 2 for pumping CWM in the CWM tank under pressure, a slurry heater connected to the downstream of the charge pump 2 and used for heating CWM, and a transport pipe 5 for transporting the CWM heated with the slurry heater 3 to the burner section 4a of a spouted bed gasifier 4. Further, it is provided with CWM shut-off valves 15 and 15' for interrupting the flow of coal and the flow of the aqueous slurry on the downstream of the transport pipe 5 and a CWM discharge exit 6 which branches from the transport pipe 5 on the upstream of the shut-off value 15 and discharges the coal/water slurry in the slurry heater, while keeping it in a high-pressure state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature CWM feeder for heating a CWM obtained by slurrying coal and water and supplying it to a spouted bed type coal gasification furnace, and more particularly to shutting down the coal gasification furnace. The present invention relates to a high temperature CWM supply device that prevents the CWM from being clogged in the device when the pressure suddenly drops.

[0002]

2. Description of the Related Art Conventionally, a spouted bed gasification furnace is provided with a high temperature CWM supply device for heating and supplying a CWM obtained by converting coal and water into a slurry. This high-temperature CWM feeder heats coal-water slurry (hereinafter referred to as CWM) fluidized by mixing coal and water pulverized to a particle size of 0.1 mm or less and supplies it to a jet-bed gasifier. As shown in FIG. 2, the CWM tank a for storing the CWM and the CWM tank a
Charge pump b for pumping CWM in WM tank a
Connected to the downstream side of this charge pump b,
And a transfer pipe e for transferring the CWM heated by the slurry heater c to the spouted bed gasification furnace d.

This spouted bed type gasification furnace d is composed of CWM and oxygen,
It produces hydrogen and carbon monoxide by reacting a gasifying agent such as water vapor at a high temperature, and the inside is pressurized to a high pressure of about 15 to 45 Kgf / cm ² to enhance the gasification treatment capacity. . Further, the slurry heater c heats the CWM passing therethrough in the range of 50 to 200 ° C. by a heating fluid such as steam.

Explaining how to operate this high-temperature CWM supply device, first, at startup, the room temperature CWM is supplied to the jet bed gasification furnace d side by the charge pump b.
Next, after the internal pressure of the coal gasification furnace d rises to a predetermined pressure, a heating fluid such as steam is started to flow through the slurry heater c, and the CWM passing through this is heated in the range of 50 to 200 ° C. When the supply of CWM is stopped, the slurry heater is stopped, the temperature of CWM is gradually lowered, and after returning to room temperature, the gasification furnace is stopped.

That is, the CWM in this CWM tank a
Is usually mixed at a ratio of 65% coal and 35% water, and its viscosity is about 1000 cp, but when the ratio of coal increases by a few%, its viscosity sharply increases and the fluidity decreases. However, the slurry heater c and the transfer pipe e are clogged. On the other hand, if the proportion of water is increased to reduce the viscosity of the CWM, there is a drawback that the gasification efficiency in the spouted bed gasification furnace d is reduced. On the other hand, CWM has the property of decreasing the viscosity as the temperature increases. Therefore, this high temperature CWM supply device uses the slurry heater c to
Since the viscosity of the CWM can be lowered by heating the CWM, it is possible to use a CWM having a higher concentration than usual, and it is possible to enhance the gasification efficiency.

[0006]

By the way, in the above-mentioned high temperature CWM supply apparatus, when the internal pressure of the spouted bed gasification furnace d is suddenly lowered for some reason, the internal pressures of the slurry heater c and the transfer pipe e are simultaneously decreased. Since the pressure is rapidly reduced, the water in the CWM flowing therethrough is flushed and only the coal content of the CWM remains, which is clogged in the slurry heater c and the transfer pipe e and causes a blockage state. Therefore, in this case, the high temperature CWM feeder is completely decomposed to remove the clogged coal, or if it is impossible,
The WM feeder had to be recreated, which was a great financial and time loss.

Therefore, the present invention has been devised in order to effectively solve these drawbacks, and its purpose is to provide a slurry heater and a transfer pipe even if the internal pressure of a jet bed gasification furnace drops sharply. High-temperature C that has achieved the prevention of clogging due to clogging of coal in flowing CWM.
A WM supply device is provided.

[0008]

To achieve the above object, the present invention provides a CWM tank for storing a coal / water slurry in which coal and water are mixed, and a charge for pumping the coal / water slurry in the CWM tank. A pump, a slurry heater connected to the downstream side of the charge pump for heating the coal / water slurry, and a transfer pipe for transferring the coal / water slurry heated by the slurry heater to a jet bed gasifier. C
In a high temperature CWM supply device that heats coal / water slurry in a WM tank and supplies it to a spouted bed gasifier, a CWM that blocks the flow of coal / water slurry downstream of the transfer pipe.
A cut-off valve is provided, and a CWM discharge section is provided to branch to a transfer pipe upstream of the CWM cut-off valve to discharge the coal / water slurry in the transfer pipe and in the slurry heater to the outside while maintaining the high pressure. Is.

[0009]

Since the present invention is configured as described above, when the internal pressure of the spouted bed type gasification furnace suddenly drops, the CWM shut-off valve closes to seal the inside of the transfer pipe and prevent depressurization. At the same time, the amount of coal
The water slurry flows to the CWM discharge part and is sequentially discharged from the inside of the transfer pipe. Therefore, flushing does not occur in the transfer pipe downstream of the CWM shutoff valve and the coal is not clogged, and troublesome work such as disassembling and cleaning the transfer pipe can be omitted.

[0010]

EXAMPLE An example of the present invention will be described below.

FIG. 1 shows a high temperature CWM supply apparatus according to the present invention. As shown in the figure, this high-temperature CWM feeder is a CWM tank 1 for storing CWM in which coal and water are mixed, a charge pump 2 for pressurizing and transferring the CWM in the CWM tank 1, and a downstream of the charge pump 2. Connected to the side of the slurry heater 3 for heating the CWM, and the CWM heated by the slurry heater 3 is connected to the jet bed gasification furnace 4
It mainly comprises a transfer pipe 5 for transferring to the burner part 4a, and a CWM discharge part 6 provided downstream of the transfer pipe 5 and branched therefrom.

As described above, the jet bed gasifier has the following features.
CWM is reacted with a gasifying agent such as oxygen or water vapor at high temperature to generate hydrogen or carbon monoxide. The inside is subjected to a high pressure of about 15 to 45 Kgf / cm ² to enhance the gasification treatment capacity. Is under pressure.

The charge pump 2 is a C in the CWM tank 1.
While paying out WM, slurry heater 3 and transfer pipe 5
To the burner section 4a side of the spouted bed gasification furnace 4 through
It is transferred after being pressurized to about Kgf / cm ² .

The slurry heater 3 allows the CWM pressure-fed from the charge pump 2 to pass through, and heats the CWM in the range of 50 to 200 ° C. by a high temperature heating fluid S such as steam to reduce its viscosity and improve fluidity and fluidity. The reaction efficiency in the spouted bed gasification furnace 4 is improved. It should be noted that the heating fluid S whose temperature has been lowered by heating the CWM becomes condensed water W, is discharged from the slurry heater 3, is heated again by a heating device (not shown) to become steam, and is reused as the heating fluid S. Has become.

From the branch portion of the transfer pipe 5 and the CWM discharge portion 6, one end is connected to the CWM tank 1 and the CW is connected.
If the M recovery pipe 7 is provided in a branched manner and the CWM is not heated, the CWM flowing in the transfer pipe 5 is introduced by controlling the recovery cutoff valve 8 provided on the transfer pipe 5 side. It can be collected in the CWM tank 1.

The burner section 4a of the jet bed gasification furnace 4
The transfer pipe 5 connected to the
Two CWM shut-off valves 15 and 1 that instantly shut off the flow of M
5'is provided in parallel, and these are interlocked.
The CWM shutoff valves 15 and 15 'are adapted to automatically and instantaneously and simultaneously close when the jet bed gasifier 4 is urgently stopped for some reason. As a result, the inside of the transfer pipe 5 is hermetically closed so that no sudden pressure drop occurs.

The reason for providing the two CWM shutoff valves 15 and 15 'is to completely shut off the flow of the CWM in the transfer pipe 5. That is, as described above, since the CWM in the transfer pipe 5 is heated to a very high pressure by the slurry heater 3, it is impossible to completely shut off the CWM flow with only one shutoff valve. Therefore, some leakage of CWM may occur. Therefore, it goes without saying that only one high-performance shut-off valve having a high shut-off performance and capable of completely shutting off the flow of the high-pressure CWM may be used.

The CWM discharge part 6 includes a CWM discharge pipe 9 branched from the transfer pipe 5 on the upstream side of the CWM shutoff valve 15, and a CWM discharge pipe 9.
A discharge first cutoff valve 10 provided on the transfer pipe 5 side of the WM discharge pipe 9, and a CW on the downstream side of the discharge first cutoff valve 10.
Mixer 11 provided in the middle of M discharge pipe 9 and having a cooling water introduction valve 17 for introducing cooling water, pressure reducing valve 12 and second discharge cutoff valve 13 provided at the other end of CWM discharge pipe 9.
And a slurry discharge tank 14 provided at the other end of the CWM discharge pipe 9, and as described above, the jet bed gasification furnace is stopped and the CWM cutoff valves 15 and 15 'are shut off. At this time, the high temperature and high pressure CWM in the transfer pipe 5 is introduced, cooled while maintaining the pressure, and discharged to the outside.

The recovery shutoff valve 8 and the discharge first shutoff valve 10 are interlocked with the CWM shutoff valves 15 and 15 '.
When the CWM cutoff valves 15 and 15 'are open, both the collection cutoff valve 8 and the discharge first cutoff valve 10 are closed, and the CWM cutoff valves 15 and 15' are closed. In this case, one of the recovery cutoff valve 8 and the discharge first cutoff valve 10 is opened, and the CWM in the transfer pipe 5 flows to the CWM recovery pipe 7 side or the CWM discharge pipe 9 side. That is, in this embodiment, the CWM shutoff valve 15,
When the CWM in the transfer pipe 5 is at a relatively low temperature (for example, 80 ° C. or less) when the 15 ′ is instantly closed and the CWM does not flash even when the pressure is reduced, only the recovery cutoff valve 8 side is opened. When the CWM in the transfer pipe 5 is made to flow to the CWM recovery pipe 7 side, and the CWM is at a high temperature (80 ° C. or higher), and the flash is likely to occur when decompressing this, the first shutoff valve 10 side for discharge Open only CWM discharge pipe 9
It is designed to run to the side. In addition, the second shutoff valve for discharge 1
3, the pressure reducing valve 12 and the cooling water introduction valve 17 are interlocked with the first discharge shutoff valve 10, and in principle coincide with the opening / closing operation of the first discharge shutoff valve 10. In addition, the first shutoff valve 10 for discharge
When is closed, cooling water having a water pressure of 7 kg / cm ² is sealed in the CWM discharge pipe 9 by the cooling water introduced from the cooling water introduction valve 17.

Next, the operation of this embodiment will be described.

First, before starting the jet gasification furnace 4, the CWM is used.
The recovery cutoff valve 8 of the recovery pipe 7 is opened, a required CWM is allowed to flow, and the recovery cutoff valve 8 is closed at the time of ignition.
5, 15 'are opened, CWM is sent to the fluidized bed gasification furnace 4, gasification is started, and the internal pressure is raised. Next, when the internal pressure of the spouted bed gasification furnace 4 rises to about 20 Kgf / cm ² , the heating fluid S such as steam is started to flow through the slurry heater 3 and the CWM passing through this is within the range of 50 to 200 ° C. To heat. When a high-concentration CWM is used, unless the CWM is heated by the slurry heater 3, the pressure loss at the transfer pipe 5 and the slurry heater 3 becomes large, and the pressure at the outlet of the charge pump 2 may become too high. In this case, the internal pressure of the jet bed gasification furnace 4 is maintained at about 15 kgf / cm ² and the CWM is maintained.
After the start of heating, the internal pressure of the spouted bed gasification furnace 4 is raised to the required 20 kgf / cm ² . By adopting such an operation method, it is possible to supply a high-concentration CWM capable of improving the reaction efficiency in the spouted bed gasification furnace. When the supply of CWM is stopped, the heating temperature of the slurry heater 3 is lowered to reduce the CW even if the pressure in the transfer pipe 5 is lowered.
The supply of the M will be stopped after the M is not flushed.

However, when the fluidized bed gasification furnace 4 suddenly stops for some reason or when the pressure drops sharply, the CWM shut-off valves 15 and 15 'are instantaneously activated simultaneously to transfer the pipe 5 The inside is sealed to prevent the pressure inside the transfer pipe 5 from dropping sharply. Then, in conjunction with this, either one of the collection shutoff valve 8 and the discharge first shutoff valve 10 is opened to circulate and collect the high temperature CWM in the transfer pipe 5 or discharge it to the outside. That is, at this time, when the temperature of the CWM in the transfer pipe 5 is 80 ° C. or less and the flush is difficult to occur even if the pressure is lowered to some extent, the recovery cutoff valve 8 side is opened and the CWM is transferred to the CWM recovery pipe 7. And to stop the supply of the CWM in the transfer pipe 5 after the temperature is lowered by the slurry heater 3 in the same manner as when the jet bed gasification furnace 4 is stopped. Become.

However, when the temperature of the CWM is 80 ° C. or higher, the CWM has a high pressure.
When flowing to the recovery pipe 7 side, a flush phenomenon occurs and the transfer pipe 5 and the CWM recovery pipe 7 are clogged. Therefore, CW
When the temperature of M is 80 ° C. or higher, only the discharge first cutoff valve 10 of the CWM discharge part 6 is opened and this is made to flow to the CWM discharge part 6. In the CWM discharge section 6, the high temperature CWM flowing through the CWM discharge pipe 9 after passing through the discharge first shut-off valve 10 includes the mixer 1 equipped with the cooling water introduction valve 17.
After being mixed with the cooling water introducing valve 17 in 1 and cooled, the cooling water further passes through the CWM discharge pipe 9 and the pressure reducing valve 13 to reduce the pressure, and then the second discharge shutoff valve 1
After passing through 2, the slurry is discharged from the end to the slurry discharge tank 14. Also, at this time, the CWM of the CWM discharge unit 6
Since the inside of the discharge pipe 9 is kept at a high pressure by the cooling water that has been sealed in advance and the pressure reducing valve 13, the first discharge shutoff valve 10 and the discharge second shutoff valve 12 are opened to open the CWM discharge pipe 9.
Through the CWM, the pressure in the transfer pipe 5 does not suddenly decrease, and there is no concern that the CWM will be flushed in the transfer pipe 5. Then, as in the case where the operation of the above-mentioned jet bed gasification furnace 4 is stopped, the heating temperature by the slurry heater 3 is lowered so that the CWM in the transfer pipe 5 does not cause a flush, and then the supply thereof is stopped. At the same time, the first shutoff valve 10 for discharge is closed to stop the flow of CWM into the CWM discharge pipe 9, and thereafter, the supply of the cooling water from the cooling water introduction valve 17 is continued and the first discharge water is discharged. Shut-off valve 1
After discharging the remaining CWM in the CWM discharge pipe 9 and the mixer 11 on the downstream side of 0 to the slurry discharge tank 14, the second discharge cutoff valve 12 is closed to seal the inside of the CWM discharge pipe 9,
After the water pressure in the M discharge pipe 9 reaches a predetermined pressure, the cooling water introduction valve 17 is closed to fill the CWM discharge pipe 9 with the predetermined pressure of cooling water.

As described above, according to the present invention, the CWM shutoff valves 15, 15 'for shutting off the CWM flow are provided downstream of the transfer pipe 5.
In addition to the above, a CWM discharge portion 6 for branching the transfer pipe 5 upstream of the CWM cutoff valves 15 and 15 'from the transfer pipe 5 and discharging the high temperature and high pressure CWM in the transfer pipe 5 and the slurry heater 3 to the outside is provided. By doing so, the CWM in the device
Is prevented from being flushed, and it is possible to prevent it from becoming clogged and blocked. Therefore, it is not necessary to perform troublesome work such as disassembling and cleaning work of the device, and the cost and time cost of newly rebuilding the device are reduced.

[0025]

As described above, in short, according to the present invention, it is possible to prevent the CWM from being clogged in the device to be in a closed state, so that it is not necessary to carry out a troublesome work such as disassembling and cleaning work. It has an excellent effect that the cost and time cost of remaking the device are reduced and the reliability and durability of the device are improved.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention.

FIG. 2 is an overall schematic view showing a conventional high temperature CWM supply device.

[Explanation of symbols]

 1 CWM tank 2 Charge pump 3 Slurry heater 4 Jet bed gasifier 5 Transfer pipe 6 CWM discharge part 15,15 'CWM shutoff valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Abe 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office

Claims (1)

[Claims] 1. A CWM tank for storing a coal / water slurry in which coal and water are mixed, a charge pump for pumping the coal / water slurry in the CWM tank, and a downstream side of the charge pump, which is connected to the coal. A slurry heater for heating the water slurry, and a transfer pipe for transferring the coal / water slurry heated by the slurry heater to the jet bed gasification furnace, and the coal / water slurry in the CWM tank is heated to form the jet bed type In a high temperature CWM supply device for supplying to a gasification furnace, a CW for cutting off the flow of coal / water slurry downstream of the transfer pipe
An M cutoff valve is provided, and a CWM discharge unit is provided to branch to a transfer pipe upstream of the CWM cutoff valve to discharge coal / water slurry in the transfer pipe and in the slurry heater to the outside while maintaining high pressure. High temperature CWM characterized by
Supply device.