JPH04311796A - Apparatus for supplying high-temperature cwm - Google Patents

Abstract

PURPOSE:To provide the subject apparatus capable of preventing the clogging of the apparatus with CWM in the case of pressure lowering by placing a high-pressure reception drum to the upstream side of a transfer pipe to transfer a high-temperature CWM composed of slurried coal and water to a pressure furnace and placing a shut-off valve and a gas-injection part at the downstream side. CONSTITUTION:CWM composed of slurried coal and water is heated and supplied to a pressure furnace such as a coal gasification furnace and a pressurized fluidized layer boiler. The high-temperature CWM-supplying apparatus having the above function is provided with a CWM run tank 1 to store CWM composed of a mixture of coal and water, a charge pump 2 to transfer the coal-water slurry in the CWM run tank 1 with pressure, a heater 3 connected to the downstream side of the charge pump 2 and heating the coal-water slurry and a transfer pipe 5 to transfer the coal-water slurry heated with the heater 3 to a pressure furnace 4. A high-pressure reception drum 6 for releasing the coal-water slurry is branched from the upstream-side of the transfer pipe 5 and a shut-off valve 7 to shut off the flow of the coal-water slurry is placed at the downstream-side. A gas injection part 8 for injecting compressed gas is placed at the downstream side of the valve.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a high-temperature CWM supply device that heats CWM made of a slurry of coal and water and supplies it to a pressurized furnace such as a coal gasification furnace or a pressurized fluidized bed boiler.
This invention relates to a high-temperature CWM supply device that prevents CWM from clogging the device when the pressure inside the pressurized furnace suddenly drops.

0002

2. Description of the Related Art Conventionally, a pressurized furnace is equipped with a high-temperature CWM supply device that heats and supplies CWM which is a slurry of coal and water. This high-temperature CWM supply device produces CWM (coal/water slurry), which is made by mixing finely powdered coal and water and making it fluidized.
As shown in Fig. 2, there is a CWM run tank a for storing CWM, a charge pump b for pumping the CWM in this CWM run tank a, and a charge pump b. connected downstream of
It mainly consists of a heater c that heats the CWM, and a transfer pipe e that transfers the CWM heated by the heater c to a pressurizing furnace d.

[0003] This pressurized furnace d reacts CWM with an oxidizing agent such as oxygen or air, or a gasifying agent such as steam at high temperature, and gasifies or burns the coal-water slurry in the pressurized furnace. , the interior is 15 to increase the gasification processing capacity.
It is pressurized to a high pressure of ~45Kgf/cm2. In addition, the heater c is used to heat the CWM passing through it to reduce its viscosity and improve its fluidity, and is heated to 50 to 200°C using a heating fluid such as water vapor.
It is heated in the range of

[0004] To explain the general operating method of this high-temperature CWM supply device, first, when starting up, the CWM is checked so that it does not get clogged in the heater c or the transfer pipe e during transfer.
Room temperature, low concentration, low viscosity C with a small proportion of coal
WM is supplied to the pressure furnace d side by a charge pump b. Then, after the internal pressure of the pressurizing furnace d rises to a predetermined pressure, a heating fluid such as steam starts flowing into the heater c, and the CWM passing through it is heated in the range of 50 to 200°C. Next, the proportion of coal is gradually increased to increase the coal content concentration in the CWM to maintain a stable supply of high concentration CWM. Finally, when the supply of CWM is stopped, the proportion of coal in the CWM is reduced to lower the concentration, that is, the viscosity, and then the temperature is lowered and the supply is stopped.

[0005] That is, C in this CWM lan tank a
When the proportion of coal in WM increases by several percentage points, its viscosity increases rapidly, fluidity decreases, and the inside of the transfer pipe e becomes clogged. On the other hand, increasing the proportion of water in order to lower the viscosity of CWM has contradictory drawbacks, such as lowering the gasification efficiency and combustion efficiency in the pressurized furnace d. Therefore, this high temperature CW
The M supply device moderately heats the CWM with the heater c, suppresses the increase in the viscosity of the CWM without increasing the proportion of water, secures fluidity, and prevents the CWM from clogging the transfer pipe e. There is.

[0006]

[Problems to be Solved by the Invention] However, in the above-mentioned high-temperature CWM supply device, if the internal pressure of the pressurizing furnace d suddenly drops for some reason, the internal pressure of the heater c and the transfer pipe e will also drop at the same time. The saturated vapor pressure in the CWM flowing through it decreases and water rapidly evaporates, causing the CWM to solidify and lose its fluidity, which clogs the heater c and transfer pipe e, causing the high-temperature CWM supply device to fail. It may become blocked. In this case, the high-temperature CWM supply device must be completely disassembled to remove the clogged CWM, or if that is not possible, the high-temperature CWM supply device must be rebuilt, resulting in a large loss.

[0007] The present invention was devised to effectively solve these drawbacks, and its purpose is to prevent the heating heater c and the transfer pipe e from being damaged due to the sudden drop in the internal pressure of the pressurizing furnace d. Even if the internal pressure decreases at the same time, the C flowing through this
The present invention provides a high-temperature CWM supply device that can prevent WM from clogging inside and causing a blockage state.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a CWM run tank for storing a coal/water slurry which is a mixture of coal and water, and a coal/water slurry in the CWM run tank.
A charge pump that pumps the water slurry, a heater that is connected downstream of the charge pump and that heats the coal/water slurry, and a transfer pipe that transfers the coal/water slurry heated by the heater to the pressurizing furnace. In the high-temperature CWM supply device that heats the coal/water slurry in the CWM run tank and supplies it to the pressurizing furnace, a high-pressure receiving device is provided on the upstream side of the transfer piping and branches from this to release the coal/water slurry. In addition to providing a drum, a cutoff valve for blocking the flow of the coal/water slurry is provided on the downstream side of the transfer pipe, and further includes a gas injection part for injecting pressurized gas into the transfer pipe downstream of the cutoff valve. It is.

[0009]

[Operation] Since the present invention is constructed as described above, when the internal pressure of the pressurized furnace suddenly decreases, the shutoff valve operates to stop the flow of the coal/water slurry in the transfer pipe. At the same time, high-pressure gas is injected from the gas injection part into the transfer pipe on the downstream side of the shutoff valve, and all of the coal/water slurry flowing therein is transferred to the pressure furnace side. Therefore, the coal/water slurry will not clog the transfer pipe downstream of the shutoff valve. In addition, since the coal/water slurry in the transfer piping and heating heater upstream of the shutoff valve flows into the high-pressure receiving drum and is recovered, coal/water slurry is also contained in the transfer piping and heating heater upstream of the shutoff valve. No more clogging of water slurry.

0010

[Embodiment] An embodiment of the present invention will be described below.

FIG. 1 shows a high temperature CWM supply apparatus of the present invention. As shown in the figure, this high-temperature CWM supply device includes a CWM run tank 1 that stores CWM (coal/water slurry) that is a mixture of coal and water;
a charge pump 2 that pressurizes and transfers the CWM inside; a heater 3 connected downstream of this charge pump 2 that heats the CWM; and a CW heated by this heater 3.
Transfer piping 5 for transferring M to the pressurizing furnace 4, and this transfer piping 5
A high-pressure receiving drum 6 is provided on the upstream side of and branched from this, a cutoff valve 7 is provided on the downstream side of this transfer pipe 5 to shut off the flow of CWM, and a transfer pipe 5 downstream of this cutoff valve. It mainly consists of a gas injection part 8 that injects pressurized gas into the inside.

As described above, this pressurized furnace 4 gasifies or burns coal slurry in a pressurized furnace by reacting CWM with an oxidizing agent such as oxygen or air or a gasifying agent such as steam at high temperature. The inside is pressurized to a high pressure of about 15 to 45 Kgf/cm2 to increase gasification processing capacity.

The charge pump 2 pressurizes and transfers the CWM in the CWM run tank 1 to the pressure furnace 4 side via the heater 3 and the transfer pipe 5 to a high pressure higher than the pressure inside the furnace. Further, a CWM recovery path 10 equipped with a rupture disk 9 is provided on the outlet side of the charge pump 2, and a rupture disk 9 is provided to protect the device when the charge pump 2 develops an abnormality and the pressure exceeds a predetermined level. Disc 9 is torn.C
WM is collected again into CWM run tank 1.

Further, a heater 3 is provided downstream of the charge pump 2 via a check valve 11. This heater 3 allows the CWM pressure-fed from the charge pump 2 to pass through, and is heated by a heating fluid S such as water vapor.
CWM is heated in the range of 0 to 200°C to reduce its viscosity and improve its fluidity. The flow rate of this heating fluid S is controlled by a regulating valve 13 which is regulated by a thermometer 12 provided on the outlet side of the heater 3 . Further, the heating fluid S whose temperature has been lowered by heating the CWM becomes condensed water W and is discharged from the heater 3, and is heated again by a heating device (not shown) and becomes water vapor.
It is designed to be reused as a heating fluid S.

Furthermore, the transfer pipe 5 that connects the heater 3 and the pressure furnace 4 and that transfers the CWM heated by the heater 3 to the pressure furnace 4 side is provided with a transfer pipe 5 that connects the heater 3 and the pressure furnace 4 to transfer the CWM heated by the heater 3 to the pressure furnace 4 side. A shutoff valve 7 is provided for shutting off. This shutoff valve 7 is controlled by a pressure gauge 4a that measures the pressure inside the pressurized furnace 4, and when the pressure inside the pressurized furnace 4 suddenly decreases, it is activated instantaneously to prevent the flow of CWM inside the transfer pipe 5. It is designed to block. Further, a gas injection part 8 is provided in the transfer pipe 5 on the downstream side of the cutoff valve 7.
Simultaneously with the operation of the shutoff valve 7, pressurized gas G is injected into the transfer pipe 5 on the downstream side of the shutoff valve 7, and the CWM inside is forced to be transferred to the pressure furnace 4 side.

Further, one end of a branch pipe 5a is branched and connected to the transfer pipe 5 on the upstream side of the cutoff valve 7, and a high pressure receiving drum 6 is provided at the other end of the branch pipe 5a. Further, a branch cutoff valve 7a is provided in the middle of the branch pipe 5a, and opens instantly at the same time as the cutoff valve 7 closes in conjunction with the above cutoff valve 7, and opens inside the transfer pipe 5 on the upstream side of the cutoff valve 7. The CWM inside the heater 3 is made to flow toward the high-pressure receiving drum 6 side. The operating state of this branch cutoff valve 7a is opposite to that of the cutoff valve 7, and when the cutoff valve 7 is open in the normal state, it is in the closed state, and the CWM is in the high pressure receiving drum 6.
It is regulated to prevent it from flowing to the side. The inside of this high-pressure receiving drum 6 is controlled to approximately the same pressure as the inside of the transfer pipe 5 by pressurized gas, and the inside bottom is filled with cooling water for cooling the high-temperature CWM. That is, by maintaining the inside of the high-pressure receiving drum 6 at approximately the same pressure as the inside of the transfer pipe 5, when the branch cutoff valve 7a opens and the CWM flows to the high-pressure receiving drum 6 side, the CWM
This prevents the saturated vapor pressure of the CWM from rapidly decreasing and the water in the CWM evaporating before it flows into the high-pressure receiving drum 6, solidifying and losing fluidity, preventing it from flowing into the high-pressure receiving drum 6. . A spray nozzle 14 is provided at the upper part of the high-pressure receiving drum 6, and sprays cleaning water W' to supply cooling water into the high-pressure receiving drum 6.
The inside of the high-pressure receiving drum 6 is cleaned by discharging the WM. Further, the high pressure receiving drum 6 is provided with a pressure gauge 16 as well as a liquid level gauge 15, and the gas valve 17 and the exhaust valve 18 are controlled so that the pressure inside the high pressure receiving drum 6 becomes a predetermined pressure. . Furthermore, a discharge port 19 is provided at the lowest part of the high-pressure receiving drum 6 for discharging the cooling water W' and the cooled CWM accumulated inside.

Next, the operation of the present invention will be explained.

First, when performing normal operation, as in the past, at startup, the CWM is kept at room temperature, at a low concentration, with a small proportion of coal (approximately 60% Before and after) CWM with low viscosity is pressurized and supplied to the pressure furnace 4 side by the charge pump 2 to a pressure higher than the pressure inside the furnace. Then, when the internal pressure of the pressurizing furnace 4 rises above the minimum furnace internal pressure, a heating fluid such as steam starts to flow into the heater 3, and the CWM passing through it is heated in the range of 50 to 200°C. At this time, since the CWM is pressurized,
The water in CWM does not evaporate even at temperatures above 100°C. Next, in order to improve gasification efficiency and combustion efficiency, CWM
The concentration of CWM will be increased by gradually increasing the proportion of coal so that the viscosity of CWM does not exceed the transport limit. Finally, if the supply of CWM is to be stopped, the CWM
After reducing the proportion of coal in the coal to the same level as at startup to lower the concentration, that is, the viscosity, the heating temperature by the heater 3 is lowered and the operation is stopped. Therefore, during normal operation, the CWM does not get stuck in the device.

However, if the internal pressure of the pressurizing furnace 4 suddenly drops for some reason, the pressure gauge 4a provided in the pressurizing furnace 4 detects this and operates the shutoff valve 7 to stop the transfer. The transfer of CWM in the pipe 5 is cut off. Then, in conjunction with this, the gas valve 8a of the gas injection part 8 is activated, and the cutoff valve 7 is activated.
High-pressure gas G is injected into the transfer pipe 5 downstream of the shutoff valve 7 to pressurize all the CWMs before the moisture in the CWMs evaporates and the viscosity increases. This will spew out into the furnace 4. Therefore, the viscosity of the CWM in the transfer pipe 5 on the downstream side of the shutoff valve 7 increases and the pipe is prevented from becoming clogged.

Furthermore, when the shutoff valve 7 operates, the gas injection part 8
At the same time as the gas valve 8a of the branch pipe 5a, the branch cutoff valve 7 of the branch pipe 5a
a is activated and opened at the same time, and the heater 3 and the transfer pipe 5 are opened.
The high temperature CWM inside will be released to the high pressure receiving drum 6 side. Since the inside of this high-pressure receiving drum 6 is pressurized to approximately the same pressure as the inside of the device by pressurized gas, the saturated water vapor pressure in the high-temperature CWM received by this drum 6 does not drop and the water does not evaporate rapidly. , CWM liquidity is maintained and C
WM flows smoothly into the high-pressure receiving drum 6. The high-concentration CWM flowing into the high-pressure receiving drum 6 is cooled down to room temperature by the cooling water supplied inside the drum 6, and then discharged to the outside from the drain port 19 together with the cleaning water W' from the spray nozzle 14. It turns out. Therefore, the high-temperature CWM in the transfer pipe 5 and heater 3 on the upstream side of the shutoff valve 7 flows smoothly into the high-pressure receiving drum 6 without solidifying or reducing fluidity, so it is not clogged. . Then, similarly to the above-described normal operation stoppage, after gradually decreasing the proportion of coal in the CWM to lower the concentration, that is, the viscosity of the CWM, the heating temperature by the heater 3 is lowered and the operation is stopped.

As described above, in the present invention, when the internal pressure of the pressurized furnace 4 suddenly decreases, the shutoff valve 7 prevents the internal pressure from decreasing and prevents the viscosity of the CWM from increasing. By collecting the CWM in the high-pressure receiving drum 6, it is possible to prevent the CWM from becoming clogged in the apparatus. Therefore, there is no need to perform troublesome work such as disassembling and cleaning the device, and the cost and time cost of rebuilding the device is reduced.

[0022]

[Effects of the Invention] In summary, according to the present invention, it is possible to prevent the CWM from becoming clogged in the device, thereby eliminating the need for troublesome work such as disassembling and cleaning the device. At the same time, it has an excellent effect of reducing the cost and time cost of rebuilding the device.

[Brief explanation of drawings]

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

FIG. 2 is a schematic diagram showing a conventional high temperature CWM supply device.

[Explanation of symbols]

1 CWM run tank 2 Charge pump 3 Heater 4 Pressure furnace 5 Transfer piping 6 High pressure receiving drum 7 Shutoff valve 8 Gas injection part

Claims (1)

[Claims] Claim 1: A CWM run tank that stores a coal/water slurry that is a mixture of coal and water; a charge pump that pumps the coal/water slurry in the CWM run tank;・Equipped with a heater that heats the water slurry and a transfer pipe that transfers the coal/water slurry heated by the heater to the pressure furnace,
In the high-temperature CWM supply device that heats the coal/water slurry in the M-run tank and supplies it to the pressurizing furnace, a high-pressure receiving drum is provided on the upstream side of the transfer pipe to branch from this and release the coal/water slurry, A high-temperature system characterized by comprising a cutoff valve for blocking the flow of the coal/water slurry on the downstream side of the transfer pipe, and further comprising a gas injection part for injecting pressurized gas into the transfer pipe downstream of the cutoff valve. CWM supply device.