Dedusting and filtering device suitable for gasified anthracite or coke

Abstract

The utility model provides a dust removal filtering device suitable for gasified anthracite or coke, which comprises a filtering assembly, a dust removal assembly, a dust removal assembly, a dust removal assembly and a dust removal assembly, pulverized coal in dust-containing coal gas output by the gasification furnace is removed through the filter; pulverized coal is fed into the variable-pressure lock hopper for pressure relief and then is input to the downstream; coal gas output by the filter enters the medium-pressure waste heat boiler; and the liquid sealing piece is connected with the filter in parallel, and when the pressure difference of the filter is increased, the dust-containing coal gas output by the gasification furnace passes through the liquid sealing piece and then enters the medium-pressure waste heat boiler. The dedusting and filtering device in the embodiment is arranged between the gasification furnace and the medium-pressure waste heat boiler, and after dust-containing coal gas output by the gasification furnace passes through the filtering assembly, the coal gas output by the filtering assembly hardly contains dust, so that the operation cycle of the medium-pressure waste heat boiler is greatly prolonged; and the byproduct steam quantity of the medium-pressure waste heat boiler is greatly improved compared with that of the original process.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gas production, in particular to a dust removal and filtering device suitable for gasification of anthracite or coke. Background Art

[0002] The technical process of using Saiding furnace gasification for anthracite or coke is as follows. The gas output from Saiding furnace has an operating temperature of 500-550℃ and a gas volume of about 80000-90000Nm 3 / h (wet basis), dust content is about 5-6g / Nm 3 At present, cyclone separators are used for cyclone dust removal. Since cyclone separators use the principle of centrifugal sedimentation, they mainly separate some large particles entrained in the coal gas, and the dust removal effect is limited. According to the actual operation on site, the normal temperature of the coal gas after the cyclone separator enters the medium-pressure waste heat boiler is 500-550℃, and the normal temperature of the medium-pressure waste heat boiler is 300-330℃. However, the upper tube sheet of the medium-pressure waste heat boiler is prone to dust accumulation during operation, and the heat exchange tubes also have dust accumulation, resulting in poor heat exchange efficiency. During normal operation, about 12t / h of medium-pressure superheated steam (4.6MPa, 300℃) is produced per hour. In the later stage of operation, the outlet temperature of the medium-pressure waste heat boiler will rise to more than 400℃, and the by-product steam volume will be reduced to -6t / h or even lower. The pressure difference becomes larger, and the operation cycle is short, which affects the long-term stable operation of the gasifier.

[0003] Therefore, how to provide a dust removal and filtration device suitable for anthracite or coke gasification to reduce the coal dust at the gasifier outlet from 5-6g / Nm 3 Filter to 10mg / Nm 3 To alleviate the operating pressure of the medium-pressure waste heat boiler downstream of the gasifier is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the purpose of the utility model is to propose a dust removal and filtering device suitable for anthracite or coke gasification, which is arranged between a gasifier and a medium-pressure waste heat boiler and includes a filter assembly. After the dust-containing coal gas output by the gasifier passes through the filter assembly, the coal gas output by the filter assembly contains almost no dust, so that the operation cycle of the medium-pressure waste heat boiler will be greatly extended, and the by-product steam volume of the medium-pressure waste heat boiler will be significantly increased compared with the original process.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a dust removal and filtering device suitable for gasification of anthracite or coke, which is arranged between the gasifier and the medium-pressure waste heat boiler, comprising:

[0006] A filter assembly includes a filter and a pressure-changing lock hopper arranged in sequence upstream and downstream; the dust-containing coal gas output by the gasifier passes through the filter to remove the coal powder therein; the coal powder is introduced into the pressure-changing lock hopper for pressure relief and then input downstream; the coal gas output by the filter enters the medium-pressure waste heat boiler; and

[0007] A liquid seal is connected in parallel with the filter. When the pressure difference of the filter increases, the dusty coal gas output by the gasifier passes through the liquid seal and then enters the medium-pressure waste heat boiler.

[0008] In some embodiments, the filter includes a plurality of filter elements extending in a vertical direction, and the air inlet of the filter is located at the bottom of the filter elements.

[0009] In some embodiments, the filter assembly further includes a back-blowing assembly disposed on the top of the filter to blow the dust and coal on the surface of the filter into the variable pressure lock bucket.

[0010] In some embodiments, the backflush assembly includes a purge component, which is arranged in a one-to-one correspondence with the filter element and is located on the top of the filter element.

[0011] In some embodiments, the filter assembly further includes an ash cooler, the inlet of which is connected to the variable pressure lock bucket to cool the coal powder to room temperature.

[0012] In some embodiments, each group of filter elements includes a plurality of filter elements.

[0013] In some embodiments, under set working conditions, the backflush assembly backflushs periodically.

[0014] In some embodiments, when the operating pressure difference of the filter assembly reaches a set value, the dust-containing coal gas output by the gasifier passes through the liquid seal to prevent the gasifier from being shut down due to pressure buildup.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 This is a schematic diagram of the structure of a dust removal and filtering device suitable for gasification of anthracite or coke, proposed in one embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of a dust removal and filtering device suitable for gasification of anthracite or coke, proposed in one embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of a dust removal and filtering device suitable for gasification of anthracite or coke, proposed in one embodiment of the utility model;

[0020] In the figure, 1, filter; 2, transformer lock bucket; 3, liquid seal; 4, backflush assembly; 5, ash cooler; 6, gasifier; 7, medium-pressure waste heat boiler. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0022] See also Figure 1 The utility model proposes a dust removal and filtering device suitable for gasification of anthracite or coke, which is arranged between the gasifier 6 and the medium-pressure waste heat boiler 7, including a filter assembly and a liquid seal 3; wherein the filter assembly includes a filter 1 and a transformer lock hopper 2 arranged in sequence upstream and downstream; the dust-containing coal gas output by the gasifier 6 passes through the filter 1 to remove the coal powder therein; the coal powder is introduced into the transformer lock hopper 2 for pressure relief and then input downstream; the coal gas output by the filter 1 enters the medium-pressure waste heat boiler 7.

[0023] The dust removal and filtering device is arranged between the gasifier 6 and the medium-pressure waste heat boiler 7, and includes a filter assembly and a liquid seal 3; the filter assembly includes a filter 1 and a transformer lock hopper 2, that is, the air inlet of the filter 1 is connected to the dusty coal gas outlet of the gasifier 6, the dusty coal gas output by the gasifier 6 passes through the filter 1 to remove the coal powder therein, the coal powder outlet of the filter 1 is connected to the inlet of the transformer lock hopper 2, and the coal powder is passed into the transformer lock hopper 2 to release the pressure and then input to the downstream. After the dusty coal gas passes through the filter 1 to remove the coal powder therein, the coal gas output by the filter 1 enters the medium-pressure waste heat boiler 7, and the heat in the coal gas is recovered and steam is generated by using the medium-pressure boiler feed water.

[0024] In the example, the filter 1 is a high-efficiency filter 1 including multiple groups of filter elements extending in the vertical direction, and each group of filter elements includes multiple filter elements; the air inlet of the filter 1 is located at the bottom of the filter element, the coal powder outlet of the filter 1 is located below the filter element, and the coal gas outlet of the filter 1 is located at the top of the filter element; the inlet of the variable pressure lock bucket 2 is connected to the coal powder outlet of the filter 1; this embodiment uses the high-efficiency filter 1 to replace the cyclone separator in the related art to reduce the dust-containing coal gas at the outlet of the gasifier 6 from 5 to 6 g / Nm 3 Filter to 10mg / Nm 3The filtered coal powder is high-pressure dry coal dust, which is introduced into the transformer lock bucket 2 to release the pressure and then drop to normal pressure before being input downstream.

[0025] In this embodiment, the coal gas output from the filter 1 contains almost no dust, and the medium-pressure waste heat boiler 7 begins to decay and the pressure difference gradually increases after 40 days instead of the original 40 days. It will be extended to more than 100 days before it begins to decay and the pressure difference gradually increases, so that the operation cycle of the medium-pressure waste heat boiler 7 will be greatly extended. Since the coal dust accumulation in the medium-pressure waste heat boiler 7 is reduced, the fouling coefficient of the heat exchanger is reduced, the operation pressure of the medium-pressure waste heat boiler 7 is alleviated, and at the same time, the amount of by-product steam of the medium-pressure waste heat boiler 7 will be significantly increased compared with the original process.

[0026] It should be noted that the dust removal and filtering device in the present application also includes a liquid seal 3, which is connected in parallel with the filter 1 and is arranged between the gasifier 6 and the medium-pressure waste heat boiler 7, that is, the dust-containing coal gas output by the gasifier 6 enters the medium-pressure waste heat boiler 7 after passing through the liquid seal 3. For example, when the operating pressure difference of the filter assembly reaches the set value, the pressure difference of the filter 1 is relatively large at this time, and the dust-containing coal gas output by the gasifier 6 can break through the liquid seal 3 at the outlet of the gasifier 6 to the downstream, so as to avoid the gasifier 6 from stopping due to pressure buildup.

[0027] In some embodiments, the filter assembly further includes a back-blowing assembly 4 disposed on the top of the filter 1 to blow the dust and coal on the surface of the filter 1 into the transformer lock bucket 2 .

[0028] The filter assembly also includes a back-blowing assembly 4 disposed on the top of the filter 1. It is known that the pressure difference of the filter 1 will gradually increase during the filtering process. The back-blowing assembly 4 is disposed on the top of the filter 1, and can back-blow according to the actual operating conditions to blow the fine coal powder on the surface of the filter 1 into the variable pressure lock bucket 2 for storage. Figure 3 The back-blowing assembly 4 shown includes a purge component, which is arranged in a one-to-one correspondence with the filter element, and the purge is located at the top of the filter element; under the set working conditions, the back-blowing assembly 4 back-blows regularly.

[0029] In some embodiments, the filter assembly further includes an ash cooler 5, the inlet of which is connected to the transformer lock bucket 2 to cool the coal powder to room temperature.

[0030] Among them, the filter assembly also includes a cold ash machine 5 such as Figure 2 and Figure 3 As shown, the inlet of the ash cooler 5 is connected to the transformer lock hopper 2. After the transformer lock hopper 2 is depressurized, the pulverized coal that has dropped to normal pressure enters the ash cooler 5, is cooled to normal temperature, and is pneumatically transported to downstream users.

[0031] Therefore, the working principle of the dust removal and filtering device applicable to the gasification of anthracite or coke in this embodiment is as follows:

[0032] The dusty coal gas at the outlet of the gasifier 6 is passed into the filter 1, and the dusty coal gas is reduced from 5 to 6 g / Nm3 Filter to 10mg / Nm 3 Below; the coal powder filtered out of the dusty coal gas is passed into the transformer lock hopper 2 to release the pressure and then drop to normal pressure, and then enters the ash cooler 5 to cool to room temperature, and then is pneumatically transported to downstream users. The coal gas filtered by the filter 1 is passed into the medium-pressure waste heat boiler 7 to recover the waste heat and produce by-product steam. As the filter 1 is running, the operating pressure difference of the filter 1 gradually increases. The back-blowing component 4 set on the top of the filter 1 can be back-blown regularly according to the actual operating conditions, and the fine coal powder on the surface of the filter 1 can be blown into the transformer lock hopper 2 for storage; when the operating pressure difference of the filter component reaches the set value, the dusty coal gas output by the gasifier 6 can break through the liquid seal 3 at the outlet of the gasifier 6 to the downstream, so as to avoid the gasifier 6 from stopping due to pressure buildup.

[0033] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A dust removal and filtering device suitable for gasification of anthracite or coke, characterized in that: It is installed between the gasifier and the medium-pressure waste heat boiler, including The filter assembly includes a filter and a pressure-changing lock bucket arranged in sequence upstream and downstream; the dust-containing coal gas output by the gasifier passes through the filter to remove the coal powder therein; the coal powder is introduced into the pressure-changing lock bucket for pressure relief and then input into the downstream; the coal gas output by the filter enters the medium-pressure waste heat boiler; as well as Liquid seals; It is connected in parallel with the filter, and when the pressure difference of the filter increases, the dust-containing coal gas output by the gasifier passes through the liquid seal and then enters the medium-pressure waste heat boiler.

2. The dust removal and filtering device suitable for gasification of anthracite or coke according to claim 1, characterized in that: The filter comprises a plurality of filter core members extending in a vertical direction, and the air inlet of the filter is located at the bottom of the filter core members.

3. The dust removal and filtering device suitable for gasification of anthracite or coke according to claim 2, characterized in that: The filter assembly also includes a back-blowing assembly arranged on the top of the filter to blow the dust and coal on the surface of the filter into the variable pressure lock bucket.

4. The dust removal and filtering device for anthracite or coke gasification according to claim 3 is characterized in that: The backflush assembly includes a purge component, which is arranged in one-to-one correspondence with the filter element and is located on the top of the filter element.

5. The dust removal and filtering device suitable for gasification of anthracite or coke according to claim 3, characterized in that: The filter assembly also includes an ash cooler; the inlet of the cooler is connected to the voltage-changing lock bucket to cool the coal powder to room temperature.

6. The dust removal and filtering device suitable for gasification of anthracite or coke according to claim 4, characterized in that: Each group of filter elements includes a plurality of filter elements.

7. The dust removal and filtering device for anthracite or coke gasification according to claim 6, characterized in that: Under set working conditions, the backflush component backflushs regularly.

8. The dust removal and filtering device for anthracite or coke gasification according to claim 7, characterized in that: When the operating pressure difference of the filter assembly reaches a set value, the dust-containing coal gas output by the gasifier passes through the liquid seal to prevent the gasifier from stopping due to pressure buildup.

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