CN209974693U - Hot feeding coal water slurry coal gasification structure - Google Patents
Hot feeding coal water slurry coal gasification structure Download PDFInfo
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- CN209974693U CN209974693U CN201920676459.1U CN201920676459U CN209974693U CN 209974693 U CN209974693 U CN 209974693U CN 201920676459 U CN201920676459 U CN 201920676459U CN 209974693 U CN209974693 U CN 209974693U
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Abstract
A hot feed coal water slurry coal gasification structure comprises a coal water slurry storage tank, wherein an outlet of the coal water slurry storage tank is connected with an inlet of a coal water slurry pump through a coal water slurry main pipe, an outlet of the coal water slurry pump is connected with a coal water slurry inlet of a coal water slurry preheating device through a coal water slurry main pipe, a coal water slurry outlet of the coal water slurry preheating device is connected with a coal water slurry inlet of a gasification furnace through a coal water slurry main pipe, an oxygen inlet of the gasification furnace is connected with an oxygen pipeline, and a synthesis gas outlet of the; the heat source inlet of the coal water slurry preheating device is connected with the outlet of the heat source fluid inlet pipeline, the heat source fluid inlet pipeline is provided with a second valve, and the heat source outlet of the coal water slurry preheating device is connected with the inlet of the heat source fluid outlet pipeline; the utility model is easier to be used for upgrading and reforming the coal gasification of the traditional coal water slurry, and the reforming cost and the reforming difficulty are relatively small; meanwhile, the coal water slurry preheating device is more suitable for preheating the shear thinning non-Newtonian fluid with higher viscosity of the coal water slurry.
Description
Technical Field
The utility model belongs to the technical field of the coal chemical industry, concretely relates to hot feeding coal slurry coal gasification structure.
Background
The coal gasification technology is a leading technology of coal chemical industry, the entrained flow bed pressurized gasification technology of the coal water slurry in the coal gasification technology is relatively mature and reliable, and the seeking and adopting of a more reasonable and efficient coal water slurry utilization way can certainly greatly improve the economic benefit of coal gasification. The normal temperature feeding mode of the coal water slurry is adopted in the common coal water slurry gasification, and the coal water slurry needs to absorb a large amount of heat to vaporize the contained moisture after entering a gasification furnace and reaches the gasification temperature; such a feeding mode has adverse effects on the coal water slurry gasification efficiency, the coal water slurry atomization effect and the stability of the gasification process. And a coal water slurry preheating device is added in the coal water slurry gasification structure, the coal water slurry is preheated to a certain degree before entering the gasification furnace, the inlet temperature is properly increased, the coal water slurry reaches a hot feeding state, the coal water slurry can be atomized in the gasification furnace more easily, the gasification process is more stable, the gasification efficiency is higher, and the oxygen consumption is reduced.
The coal gasification structure for preheating/heating coal water slurry disclosed at present mainly recovers heat energy in black water generated by chilling in the gasification process to heat the coal water slurry, and ignores the condition that part of the coal gasification process recovers the heat of synthesis gas by adopting a waste heat boiler process instead of the chilling process; in addition, various waste heat which can be utilized in a factory can be used as a heat source for heating the coal water slurry, the possibility of utilizing other waste heat of the factory is not considered in the structures, and the utilization of the heat energy in the black water generated by chilling has larger transformation difficulty and transformation cost; in addition, most of the structures do not relate to a specific device for heating water coal slurry, and the conventional heat exchanger is difficult to be suitable as a water coal slurry preheating device due to the unique fluid characteristics of the water coal slurry.
Coal water slurry is a viscous non-newtonian fluid with a large apparent viscosity that decreases with increasing shear rate, and has a significant effect on the pressure drop that the coal water slurry flows through the preheater. Therefore, in order to ensure the pressure of the coal water slurry inlet during the coal water slurry preheating process and simultaneously consider the reduction of the transformation difficulty of the coal water slurry gasification system, the pressure drop of the coal water slurry should be reduced as much as possible when the same preheating effect is achieved. In a common bow-shaped baffle plate heat exchanger, the flow of fluid in a shell side is Z-shaped, and throttling and flow dead zones are easily generated in the flow, so that the shell side pressure drop is large, the heat transfer coefficient of a membrane is low, and scaling is easily caused, therefore, the heat exchanger is not suitable for being used as a coal water slurry preheating device. The spiral baffle heat exchanger can effectively improve the defects of the bow-shaped baffle heat exchanger because the shell side fluid spirally flows around the axis of the tube bundle. But the gap exists at the lap joint of two adjacent baffle plates in the shell pass in the traditional spiral baffle plate heat exchanger, and the gap can form a quick fluid passage, so that the fluid on the shell side is locally short-circuited, especially for coal water slurry with high viscosity, the leakage flow from the gap is easier, the heat transfer is not facilitated, and the spiral baffle plate heat exchanger is not suitable for serving as a coal water slurry preheating device.
Disclosure of Invention
In order to overcome the shortcoming of the prior art, the utility model aims to provide a hot feeding coal slurry coal gasification structure is used for the upgrading transformation of traditional coal slurry coal gasification more easily, and transformation cost and degree of difficulty are less relatively to can select multiple mill's used heat as the heat source of preheating the coal slurry, coal slurry preheating device novel structure simultaneously, be more suitable for the higher shear thinning non-Newtonian fluid of this kind of viscosity of preheating the coal slurry.
In order to achieve the above object, the utility model discloses a technical scheme be:
a hot feeding coal water slurry coal gasification structure comprises a coal water slurry storage tank 1, wherein an outlet of the coal water slurry storage tank 1 is connected with an inlet of a coal water slurry pump 2 through a coal water slurry main pipe 7, an outlet of the coal water slurry pump 2 is connected with a coal water slurry inlet of a coal water slurry preheating device 3 through a coal water slurry main pipe 7, a coal water slurry outlet of the coal water slurry preheating device 3 is connected with a coal water slurry inlet of a gasification furnace 4 through a coal water slurry main pipe 7, an oxygen inlet of the gasification furnace 4 is connected with an oxygen pipeline 11, and a synthetic gas outlet of the gasification furnace 4;
the heat source inlet of the coal water slurry preheating device 3 is connected with the outlet of a heat source fluid inlet pipeline 8, a second valve 6 is arranged on the heat source fluid inlet pipeline 8, and the heat source outlet of the coal water slurry preheating device 3 is connected with the inlet of a heat source fluid outlet pipeline 9.
The outlet of the coal water slurry pump 2 is connected with the coal water slurry feed back hole of the coal water slurry storage tank 1 through a coal water slurry branch pipe 10, and a first valve 5 is installed on the coal water slurry branch pipe 10.
The coal water slurry preheating device 3 comprises a shell side for flowing the coal water slurry and a pipe side for flowing heat supply fluid, and a baffle plate on the shell side is a bent semicircular baffle plate.
The bending type semicircular baffle plate is formed by bending a large flat plate twice according to a bending angle theta, the planes A and C at the two ends of the bent baffle plate are parallel to the plane of the tube bundle tube plate, and the plane B in the middle of the bent baffle plate forms the bending angle theta with the plane of the tube bundle tube plate; the bending degrees of the two times of bending are the same, the bending degree is equal to b/a, wherein b is the vertical distance from the circle center to the bending line along the axial orthographic projection of the tube bundle, a is the radius of the circle, and the bent baffle plate is cut and drilled according to the contour line, so that the outer contour of the bent baffle plate is in a semicircle shape.
The bending angle theta ranges from 10 degrees to 50 degrees.
The bending degree ranges from 0.2 to 0.8.
And the tube side of the coal water slurry preheating device 3 is a tube bundle with tube plates at two ends.
The coal water slurry preheated by the coal water slurry preheating device 3 is required to reach 60-200 ℃, and the pressure drop of the coal water slurry in the coal water slurry preheating device 3 is not more than 1000 kPa.
The heat source fluid of the heat source fluid inlet pipeline 8 is selected from factory waste heat, and the coal chemical industry enterprises select corresponding heat source fluids according to self conditions.
Compared with the prior art, the beneficial effects of the utility model are that:
compare in the traditional coal gasification structure that does not preheat/heat the coal slurry, the utility model discloses a hot feeding coal slurry coal gasification structure carries out the preheating of certain degree to the coal slurry before the coal slurry gets into the gasifier, suitably improves the entry temperature, makes the coal slurry reach hot feeding state, can make the coal slurry atomize in the gasifier more easily, and the gasification is more stable, and gasification efficiency is higher, reduces the oxygen consumption. By taking ASPEN PLUS process simulation as a means, comparing a traditional coal gasification structure without preheating/heating coal water slurry with the hot-feeding coal water slurry coal gasification structure of the utility model, the traditional coal gasification structure without preheating/heating coal water slurry directly sends the coal water slurry with the mass concentration of 52.13 percent at the normal temperature of 25 ℃ into a gasification furnace, and gasifies the coal water slurry under the conditions of 1280 ℃ and 4.2 MPa; the hot-feeding coal water slurry gasification structure preheats the coal water slurry with the mass concentration of 52.13 percent to 200 ℃ and then sends the coal water slurry into the gasification furnace for gasification under the same condition, the gasification cold coal gas efficiency is improved by 4.14 percent, the effective component of the synthesis gas is improved by 3.31 percent, and the oxygen consumption is reduced by 7.37 percent. For the gasification of coal water slurry with coal amount of 1000t/d, the CO/H ratio can be improved2The yield is 4365.06kmol/d, and the oxygen consumption is reduced by 70.01 t/d.
Compare in other coal gasification structures of preheating/heating coal slurry, the utility model discloses a hot feeding coal slurry coal gasification structure is used for the upgrading transformation of traditional coal slurry coal gasification more easily, and the transformation expense is less with the degree of difficulty relatively to can select multiple mill's used heat as the heat source of preheating the coal slurry.
Compared with the traditional bow-shaped baffle plate heat exchanger, the water-coal-slurry preheating device with the bent semicircular baffle plate on the shell side has small flow resistance, is not easy to deposit scale and has high membrane heat transfer coefficient. Compared with a plane plate spiral baffle plate heat exchanger, the plane plate spiral baffle plate heat exchanger has more excellent flowing heat transfer performance due to the plugging of the leakage opening of the plane plate spiral baffle plate heat exchanger, and is particularly suitable for being used as a preheating device of coal water slurry with high viscosity, easy scaling and shear thinning characteristics.
Drawings
Fig. 1 is a schematic view of the present invention.
Fig. 2 is a schematic structural diagram of the coal water slurry preheating device of the present invention.
FIG. 3 is a three-dimensional schematic view of a bent semicircular baffle.
FIG. 4 is a side view of a bent-type semi-circular baffle (in the circumferential direction of the tube bundle).
FIG. 5 is a front view (in the axial direction of the tube bundle) of a bent semi-circular baffle.
FIG. 6 is a schematic view of the installation of the coal water slurry preheating device.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a hot feed coal-water slurry gasification structure comprises a coal-water slurry storage tank 1, wherein an outlet of the coal-water slurry storage tank 1 is connected with an inlet of a coal-water slurry pump 2 through a coal-water slurry main pipe 7, an outlet of the coal-water slurry pump 2 is connected with a coal-water slurry inlet of a coal-water slurry preheating device 3 through a coal-water slurry main pipe 7, a coal-water slurry outlet of the coal-water slurry preheating device 3 is connected with a coal-water slurry inlet of a gasification furnace 4 through a coal-water slurry main pipe 7, an oxygen inlet of the gasification furnace 4 is connected with;
the heat source inlet of the coal water slurry preheating device 3 is connected with the outlet of a heat source fluid inlet pipeline 8, a second valve 6 is arranged on the heat source fluid inlet pipeline 8, and the heat source outlet of the coal water slurry preheating device 3 is connected with the inlet of a heat source fluid outlet pipeline 9.
The outlet of the coal water slurry pump 2 is connected with the coal water slurry feed back hole of the coal water slurry storage tank 1 through a coal water slurry branch pipe 10, and a first valve 5 is installed on the coal water slurry branch pipe 10.
The working process of the hot feeding coal water slurry coal gasification structure is as follows:
50-70% of the coal water slurry in the coal water slurry storage tank 1 flows through the coal water slurry main pipe 7 and the coal water slurry branch pipe 10 after being pressurized by the coal water slurry pump 2, and the flow entering the coal water slurry preheating device 3 through the coal water slurry main pipe 7 is adjusted by adjusting the opening degree of a first valve 5 arranged on the coal water slurry branch pipe 10; after entering the coal water slurry preheating device 3, the coal water slurry flows on the shell side of the coal water slurry preheating device 3 and exchanges heat with heat source fluid flowing on the tube side of the coal water slurry preheating device 3 to be heated, the flow of the heat source fluid entering the coal water slurry preheating device 3 is adjusted by adjusting the opening of a second valve 6 arranged on a heat source fluid inlet pipeline 8, and the temperature of the preheated coal water slurry is further adjusted; the preheated coal water slurry should reach 60-200 ℃ to reach a hot feeding state, and the pressure drop of the coal water slurry in the coal water slurry preheating device 3 should not be more than 1000kPa so as to avoid influencing the pressure in the gasifier 4; the coal water slurry reaching the hot feeding state continuously enters the gasification furnace 4 through the coal water slurry main pipe 7, and is subjected to gasification reaction with oxygen entering the gasification furnace 4 through the oxygen pipeline 11 to produce synthesis gas, and the reacted crude synthesis gas is led to a synthesis gas treatment working section.
The heat source fluid of the heat source fluid inlet pipeline 8 is selected from factory waste heat, including high-temperature condensed water, steam turbine exhaust steam of integrated gasification combined cycle power generation (IGCC), or black water, high-temperature cooling water and the like generated in a coal gasification chilling process, and the corresponding heat source fluid is selected by a coal chemical industry enterprise according to the self condition, so that the transformation difficulty is greatly reduced, and the transformation feasibility is greatly improved.
Referring to fig. 2, the coal water slurry preheating device 3 comprises a shell side for flowing the coal water slurry and a pipe side for flowing the heat supply fluid, and the baffle plate on the shell side is in the form of a bent semicircular baffle plate; referring to fig. 3 and 4, the bending type semicircular baffle plate is formed by bending a large flat plate twice according to a bending angle theta, the planes a and C at the two ends of the baffle plate formed after bending are parallel to the plane of the tube bundle tube plate, and the plane B in the middle forms the bending angle theta with the plane of the tube bundle tube plate; the bending degrees of the two times of bending are the same, the bending degree is equal to b/a, wherein b is the vertical distance from the circle center to the bending line along the axial orthographic projection of the tube bundle, and a is the radius of the circle, which is shown in figure 5; cutting and drilling the bent baffle plate according to the side contour line to ensure that the outer contour of the baffle plate is just a semicircle; the bending angle theta ranges from 10 degrees to 50 degrees, the bending degree ranges from 0.2 degrees to 0.8 degrees, and the tube side of the coal water slurry preheating device 3 is a tube bundle with tube plates at two ends, as shown in figure 2.
The installation mode of the coal water slurry preheating device 3 is as follows:
referring to fig. 6, firstly, a first bending type semicircular baffle plate 14 is positioned in a tube bundle by a pull rod 12 and a distance tube 13, then a second bending type semicircular baffle plate 15 is installed, the second bending type semicircular baffle plate 15 is turned 180 degrees relative to the first bending type semicircular baffle plate 14, the second bending type semicircular baffle plate 15 is placed behind the first bending type semicircular baffle plate along the axis direction of the tube bundle, the positions of the first bending type semicircular baffle plate 14 and the second bending type semicircular baffle plate 15 are adjusted, the orthographic projections of two adjacent baffle plates form a whole circle, then the pull rod 12 and the distance tube 13 are used for positioning, and the processes are repeated until the whole tube bundle is installed.
Claims (9)
1. A hot feed coal-water slurry gasification structure comprises a coal-water slurry storage tank (1), and is characterized in that: an outlet of the water-coal-slurry storage tank (1) is connected with an inlet of a water-coal-slurry pump (2) through a water-coal-slurry main pipe (7), an outlet of the water-coal-slurry pump (2) is connected with a water-coal-slurry inlet of a water-coal-slurry preheating device (3) through a water-coal-slurry main pipe (7), a water-coal-slurry outlet of the water-coal-slurry preheating device (3) is connected with a water-coal-slurry inlet of a gasification furnace (4) through the water-coal-slurry main pipe (7), an oxygen inlet of the gasification furnace (4) is connected with an oxygen pipeline;
the heat source inlet of the coal water slurry preheating device (3) is connected with the outlet of a heat source fluid inlet pipeline (8), a second valve (6) is installed on the heat source fluid inlet pipeline (8), and the heat source outlet of the coal water slurry preheating device (3) is connected with the inlet of a heat source fluid outlet pipeline (9).
2. The structure of claim 1, wherein: the outlet of the coal water slurry pump (2) is connected with a coal water slurry feed back hole of the coal water slurry storage tank (1) through a coal water slurry branch pipe (10), and a first valve (5) is installed on the coal water slurry branch pipe (10).
3. The structure of claim 1, wherein: the coal water slurry preheating device (3) comprises a shell side for flowing the coal water slurry and a pipe side for flowing heat supply fluid, and a baffle plate on the shell side is a bent semicircular baffle plate.
4. The structure of claim 3, wherein: the bending type semicircular baffle plate is formed by bending a large flat plate twice according to a bending angle theta, the planes A and C at the two ends of the bent baffle plate are parallel to the plane of the tube bundle tube plate, and the plane B in the middle of the bent baffle plate forms the bending angle theta with the plane of the tube bundle tube plate; the bending degrees of the two times of bending are the same, the bending degree is equal to b/a, wherein b is the vertical distance from the circle center to the bending line along the axial orthographic projection of the tube bundle, a is the radius of the circle, and the bent baffle plate is cut and drilled according to the contour line, so that the outer contour of the bent baffle plate is in a semicircle shape.
5. The structure of claim 4, wherein: the bending angle theta ranges from 10 degrees to 50 degrees.
6. The structure of claim 4, wherein: the bending degree ranges from 0.2 to 0.8.
7. The structure of claim 1, wherein: and the tube side of the coal water slurry preheating device (3) is a tube bundle with tube plates at two ends.
8. The structure of claim 1, wherein: the coal water slurry preheated by the coal water slurry preheating device (3) is required to reach 60-200 ℃, and the pressure drop of the coal water slurry in the coal water slurry preheating device (3) is not more than 1000 kPa.
9. The structure of claim 1, wherein: the heat source fluid of the heat source fluid inlet pipeline (8) selects factory waste heat, and the coal chemical industry enterprises select corresponding heat source fluids according to self conditions.
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| CN110016367A (en) * | 2019-05-13 | 2019-07-16 | 西安交通大学 | A kind of hot feed water-coal-slurry gasification system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110016367A (en) * | 2019-05-13 | 2019-07-16 | 西安交通大学 | A kind of hot feed water-coal-slurry gasification system |
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