Online impurity iron removal device for coal water slurry

Abstract

An online impurity iron removal device for coal water slurry comprises an iron removal tank, the upper end of the iron removal tank is communicated with a feeding pipe, the lower end of the iron removal tank is communicated with a coal slurry tank through a discharging pipe, multiple layers of electromagnetic grids are sequentially arranged in the iron removal tank from top to bottom at intervals, an electromagnetic coil is arranged outside the iron removal tank, the discharging pipe is communicated with an impurity iron tank through a slag discharging pipe, and the feeding pipe is communicated with a water inlet pipe. And a first electric valve, a second electric valve, a third electric valve and a fourth electric valve are respectively arranged on the feeding pipe, the discharging pipe, the slag discharging pipe and the water inlet pipe. The system is simple in process flow and less in equipment, can realize online impurity iron removal of the coal water slurry by adopting advanced intelligent control, can effectively remove impurity iron in the coal water slurry, and ensures stable operation of a coal water slurry gasification device.

Description

Technical Field

[0001] The utility model relates to an on-line impurity iron removal device for water-coal slurry. Background Art

[0002] Coal-water slurry is the main raw material for coal-water slurry gasification. It is a solid-liquid mixture made of 60-65% coal, 34-39% water and 1% chemical additives according to certain requirements. It has good fluidity and stability, good atomization effect and high combustion efficiency. Coal-water slurry needs to go through many production processes such as raw coal mining, transportation, delivery, crushing, and coal grinding. In each production process of coal-water slurry production, some iron may be mixed in. These irons are mixed in the coal-water slurry in the form of flakes, needles, powders, etc. It is extremely difficult to remove. After crushing and grinding, the iron is crushed into small particles and mixed into the water-coal slurry. After passing through the mill screen, the iron enters the low-pressure coal slurry pump and the high-pressure coal slurry pump. Because the coal slurry pump is a plunger type with a one-way valve structure, some iron debris will be stuck at the one-way valve when it is transported to the coal slurry pump in the coal slurry, and the one-way valve will not return to the seat, resulting in the reflux of coal slurry, and the flow entering the burner is reduced. When the interlocking amount of the tripping is reached, the gasifier interlocks and trips; the iron has a great influence on the use of the burner, which is easy to block the burner channel, causing unstable coal slurry flow, large fluctuations in the burner pressure difference, unstable gas flow field in the gasifier, and burner erosion damage, forcing the gasifier to stop; after the iron enters the gasifier, it melts due to high temperature, and the molten iron penetrates into the gaps of the refractory bricks. Due to the strong heat transfer capacity of iron, it affects the insulation of the refractory bricks, which can easily cause the gasifier to overheat and be forced to stop, and the service life of the refractory bricks of the gasifier is reduced; the water-coal slurry gasification device is often forced to stop due to the influence of iron.

[0003] The existing patent technology, publication number: CN213079126U, discloses a kind of impurity removal device for water-coal slurry, including a base, a feeding device is fixedly connected to the right side of the top of the base, a secondary impurity removal device is connected to the top of the feeding device, a feeding pipe is connected to the top of the secondary impurity removal device, and a primary impurity removal device is connected to the top of the secondary impurity removal device. The left side of the bottom of the primary impurity removal device is fixedly connected to the left side of the top of the base through a support frame. The utility model improves the secondary impurity removal device. When the falling material processed by the primary impurity removal device enters the fixed cylinder, the auger transfers the material to the adsorption frame, and the first motor and the second motor rotate in opposite directions. In this way, the material is screened in the adsorption frame, and the inner wall of the adsorption frame is provided with a magnet, so that fine metal-like powder and granular matter can be adsorbed, so that the metal impurities can be completely removed, thereby avoiding the problem of metal damaging the equipment in the later processing. The patent technology sets a secondary impurity removal device, which is set before pulping. Because the impurity iron may be mixed in the coal grinding process of pulping, the patent technology does not completely remove the impurity iron in the water-coal slurry. Utility Model Content

[0004] The utility model aims to solve the problem that the impurities contained in the water-coal slurry mentioned in the above background will cause great harm to the stable operation of the coal slurry pump, burner and gasifier; it provides an online impurity iron removal device for water-coal slurry, which has a simple process flow, less equipment, and adopts advanced intelligent control to realize online impurity iron removal of water-coal slurry, and can effectively remove the impurities in the water-coal slurry to ensure the stable operation of the water-coal slurry gasification device.

[0005] In order to solve the above problems, the technical solution of the utility model is:

[0006] An online iron removal device for water-coal slurry comprises an iron removal tank, wherein the upper end of the iron removal tank is connected to a feed pipe, and the lower end is connected to a coal slurry tank through a discharge pipe, multiple layers of electromagnetic grids are sequentially arranged from top to bottom in the iron removal tank, an electromagnetic coil is arranged outside the iron removal tank, the discharge pipe is connected to the iron tank through a slag discharge pipe, the feed pipe is connected to a water inlet pipe, and a first electric valve, a second electric valve, a third electric valve and a fourth electric valve are respectively installed on the feed pipe, the discharge pipe, the slag discharge pipe and the water inlet pipe.

[0007] The feed pipe is connected to the coal slurry tank through a bypass pipe, and a fifth electric valve is installed on the bypass pipe.

[0008] A jacket is provided outside the iron tank, and the electromagnetic coil is arranged in the jacket. The upper and lower ends of the jacket are connected with the heat medium inlet and outlet of the heat exchanger through a circulating oil pipe. A circulating pump is installed on the circulating oil pipe, and the cold medium inlet and outlet of the heat exchanger are connected with the circulating water pipe.

[0009] A temperature sensor is installed on the jacket.

[0010] A differential pressure sensor is connected between the feed pipe and the discharge pipe.

[0011] The first electric valve, the second electric valve, the third electric valve, the fourth electric valve and the differential pressure sensor are connected to a DCS control system.

[0012] The beneficial effects of the utility model are:

[0013] 1. It can effectively protect the safety of subsequent equipment, effectively improve the service life of the coal slurry pump, and improve the pressure fluctuation of the gasifier, effectively protect the refractory bricks of the gasifier, improve the stability of equipment operation, and extend the long-term safe and stable operation of the gasification device.

[0014] 2. Remote online start and stop, iron removal, iron unloading, flushing and other operations can be realized in the DCS control system without manual operation, which improves the intelligence level of the coal gasification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings:

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the utility model.

[0018] In the figure: in addition to the feed pipe 1, the bypass pipe 2, the fifth electric valve 3, the coal slurry tank 4, the discharge pipe 5, the second electric valve 6, the iron tank 7, the third electric valve 8, the slag discharge pipe 9, the electromagnetic coil 10, the temperature sensor 11, the jacket 12, the pressure difference sensor 13, the first electric valve 14, the fourth electric valve 15, the water inlet pipe 16, the iron tank 17, the circulating pump 18, the electromagnetic grille 19, the heat exchanger 20, and the circulating water pipe 21. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] An online iron removal device for water-coal slurry comprises an iron removal tank 17, the upper end of the iron removal tank 17 is connected to a feed pipe 1, and the lower end is connected to a coal slurry tank 4 through a discharge pipe 5, multiple layers of electromagnetic grids 19 are sequentially arranged from top to bottom in the iron removal tank 17, an electromagnetic coil 10 is arranged outside the iron removal tank 17, the discharge pipe 5 is connected to the iron tank 7 through a slag discharge pipe 9, the feed pipe 1 is connected to a water inlet pipe 16, and a first electric valve 14, a second electric valve 6, a third electric valve 8 and a fourth electric valve 15 are respectively installed on the feed pipe 1, the discharge pipe 5, the slag discharge pipe 9 and the water inlet pipe 16.

[0021] The working process of the utility model is as follows: after the electromagnetic coil 10 is powered on, the electromagnetic grid 19 is magnetic, and when the water-coal slurry flows from the feed pipe 1 through each layer of the electromagnetic grid 19, the iron impurities mixed in the water-coal slurry are adsorbed on the surface of the electromagnetic grid 19, and the water-coal slurry adsorbed with iron impurities enters the coal slurry tank 4 from the discharge pipe 5; after the electromagnetic grid 19 is full of iron impurities, the first electric valve 14 and the second electric valve 6 on the feed pipe 1 and the discharge pipe 5 are closed, and the third electric valve 8 and the fourth electric valve 15 on the water inlet pipe 16 and the slag discharge pipe 9 are opened, and the power supply of the electromagnetic coil 10 is cut off at the same time, and the flushing water flows into the iron removal tank 17 from the water inlet pipe 16 to flush the iron impurities on the electromagnetic grid 19, and the washed iron flows into the iron tank 7. After the flushing is completed, the first electric valve 14 and the second electric valve 6 are opened, and the third electric valve 8 and the fourth electric valve 15 are closed, and the iron removal device removes iron from the water-coal slurry again.

[0022] The feed pipe 1 is connected to the coal slurry tank 4 through the bypass pipe 2, and the fifth electric valve 3 is installed on the bypass pipe 2. When the electromagnetic grid 19 is flushed, the fifth electric valve 3 is opened, and the water-coal slurry directly enters the coal slurry tank 4 without affecting the operation of the system.

[0023] A jacket 12 is provided outside the iron tank 17, and the electromagnetic coil 10 is arranged in the jacket 12. The upper and lower ends of the jacket 12 are connected to the heat medium inlet and outlet of the heat exchanger 20 through a circulating oil pipe. A circulating pump 18 is installed on the circulating oil pipe. The cold medium inlet and outlet of the heat exchanger 20 are connected to the circulating water pipe 21. The heat exchanger 20 is a plate heat exchanger 20. There is insulating oil in the hot medium flow channel of the heat exchanger 20 and the jacket 12. Circulating water flows through the cold medium flow channel of the heat exchanger 20 to exchange heat with the insulating oil. The oil-water heat exchange cooling method is adopted to make the temperature rise of the electromagnetic coil 10 lower, the temperature difference between the cold and hot states is small, the long-term power-on performance of the electromagnetic coil 10 will not be reduced, and after continuous excitation, the magnetic field performance is stable and the hot suction attenuation is small.

[0024] A temperature sensor 11 is installed on the jacket 12. The temperature sensor 11 and the circulation pump 18 are connected to the DCS control system. When the temperature sensor 11 detects that the oil temperature in the jacket 12 reaches 70°C, the circulation pump 18 is controlled to start, and the heat exchanger 20 and the insulating oil are used to cool the battery coil. When the temperature drops to 50°C, the circulation pump 18 is controlled to stop, so as to control the working temperature of the electromagnetic coil 10 between 50°C and 70°C.

[0025] A differential pressure sensor 13 is connected between the feed pipe 1 and the discharge pipe 5 .

[0026] The first electric valve 14, the second electric valve 6, the third electric valve 8, the fourth electric valve 15, the electromagnetic coil 10 and the pressure difference sensor 13 are connected to the DCS control system. The pressure difference sensor 13 detects the pressure difference between the feed pipe 1 and the discharge pipe 5. When the pressure difference is less than 0.2Mpa, the DCS control system controls the water-coal slurry to go through the bypass pipe 2, and controls the flushing water to flush the electromagnetic grille 19. When the flushing pressure difference is less than 0.05Mpa, the water-coal slurry is switched to flow through the iron removal tank 17 to remove iron from the water-coal slurry, thereby realizing the automatic iron removal process of the water-coal slurry.

[0027] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the utility model concept. The protection scope of the utility model should not be deemed to be limited to the specific forms described in the embodiments. The protection scope of the utility model also extends to equivalent technical means that can be thought of by those skilled in the art based on the concept of the utility model.

Claims

1. An online iron removal device for coal water slurry, characterized in that: The invention comprises an iron removal tank (17), the upper end of the iron removal tank (17) is connected to a feed pipe (1), and the lower end is connected to a coal slurry tank (4) through a discharge pipe (5); multiple layers of electromagnetic grilles (19) are arranged in sequence from top to bottom in the iron removal tank (17); an electromagnetic coil (10) is arranged outside the iron removal tank (17); the discharge pipe (5) is connected to a miscellaneous iron tank (7) through a slag discharge pipe (9); the feed pipe (1) is connected to a water inlet pipe (16); and a first electric valve (14), a second electric valve (6), a third electric valve (8) and a fourth electric valve (15) are respectively installed on the feed pipe (1), the discharge pipe (5), the slag discharge pipe (9) and the water inlet pipe (16).

2. The on-line iron removal device for coal water slurry according to claim 1, characterized in that: The feed pipe (1) is connected to the coal slurry tank (4) through a bypass pipe (2), and a fifth electric valve (3) is installed on the bypass pipe (2).

3. The on-line iron removal device for coal water slurry according to claim 1, characterized in that: A jacket (12) is provided outside the iron tank (17), and the electromagnetic coil (10) is arranged in the jacket (12). The upper and lower ends of the jacket (12) are connected to the hot medium inlet and outlet of the heat exchanger (20) through a circulating oil pipe. A circulating pump (18) is installed on the circulating oil pipe. The cold medium inlet and outlet of the heat exchanger (20) are connected to the circulating water pipe (21).

4. The on-line iron removal device for coal water slurry according to claim 3, characterized in that: A temperature sensor (11) is mounted on the jacket (12).

5. The on-line iron removal device for coal water slurry according to any one of claims 1 to 4, characterized in that: A differential pressure sensor (13) is connected between the feed pipe (1) and the discharge pipe (5).

6. The on-line iron removal device for coal water slurry according to claim 5, characterized in that: The first electric valve (14), the second electric valve (6), the third electric valve (8), the fourth electric valve (15), the electromagnetic coil (10) and the differential pressure sensor (13) are connected to a DCS control system.

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