Pulverized coal pouring device

Abstract

The utility model provides a pulverized coal pouring device. The pulverized coal pouring device comprises a pouring pipeline assembly, a first pulverized coal bunker and a second pulverized coal bunker, feeding assemblies are independently arranged above the first pulverized coal bunker and the second pulverized coal bunker respectively; and the material pouring pipeline assembly is used for communicating the feeding assembly above the first pulverized coal bunker with the material receiving assembly of the second pulverized coal bunker. Pulverized coal can be poured only by connecting the pouring pipeline with the pouring flange and the receiving pipe openings of the adjacent series of pulverized coal bunkers, pouring is cut off through the multiple pulverized coal pipelines, and only the short straight pipe sections need to be inserted into the middle section of the pouring pipeline. The pulverized coal pouring device has the advantages of being easy to operate, low in investment, safe, reliable, small in pollution, free of residues and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal gasification, in particular to a coal powder pouring device. Background Art

[0002] Coal chemical industry is a process that uses coal as raw material, converts coal into gas, liquid and solid products or semi-products through chemical processing, and then further processes them into chemical and energy products. With the continuous reduction of world oil resources, coal chemical industry has broad prospects. Coal gasification is the most important unit in the development of coal chemical industry and is known as the leading technology of coal chemical industry. It uses air, oxygen, water vapor and other gasifying agents to carry out high-temperature gasification reaction in the gasifier, converting it into coal gas with different composition and calorific value, and then synthesizing liquid fuel and various chemical products.

[0003] Pulverized coal gasification is an entrained flow gasification technology that uses carbon dioxide or nitrogen as a carrier gas to transport pulverized coal to a gasifier, where it undergoes a partial oxidation reaction with oxidant oxygen and high-pressure steam to generate crude synthesis gas. Grinded coal drying and pressurized coal transportation are key steps in pulverized coal gasification, and its main process is briefly described as follows.

[0004] The raw coal is ground and dried in the coal mill. The mixture of coal powder and inert gas of qualified particle size is separated by the coal powder collector, and the coal powder is transported to the coal powder bin. The separated inert gas is pressurized by the circulating fan and circulated to the hot blast furnace. After mixing with the hot flue gas generated by the combustion of fuel gas in the hot blast furnace, it is sent to the coal mill to continue to be used as a drying medium. A small part is discharged through the high point of the pipeline. In order to prevent condensation caused by the decrease in coal powder temperature during the transportation of coal powder, which causes coal powder to condense, steam heating and insulation measures are taken in all coal powder transportation equipment and pipelines. Coal powder pressurized transportation uses the periodic alternating pressure increase and pressure reduction operation of the coal powder lock bucket to realize the transportation of coal powder from the low-pressure coal powder bin to the coal powder lock bucket and then to the high-pressure coal powder feeding tank, providing continuous and stable high-pressure coal powder for the gasifier. High-pressure carbon dioxide or high-pressure nitrogen is used as the carrier gas for coal powder transportation to ensure that the system is always in an inert environment. The pulverized coal leaving the pulverized coal feed tank enters the speed regulating connector, which has a built-in sintered metal sleeve to prevent the pulverized coal from polluting the gas phase pipeline. The pulverized coal flows through the sleeve, and CO2 is injected outside the sleeve to fine-tune the speed of the pulverized coal in the pipeline. A pulverized coal three-way valve is installed on the pulverized coal pipeline. Under normal operating conditions, the three-way valve leads to the main burner. When the main burner stops, the three-way valve leads to the pulverized coal circulation pipeline, and the pulverized coal returns to the pulverized coal bunker.

[0005] During the production process, it is inevitable to encounter shutdown inspections and plant overhauls. When the pulverized coal is stored for a long time in the pulverized coal bin, pulverized coal lock bucket, pulverized coal feeding tank and other equipment, the heat preservation effect decreases, the pulverized coal temperature decreases, and the fluidity becomes poor, which can easily cause pipeline blockage. As the storage time of pulverized coal is further extended, the volatile matter in the coal will be emitted, which can easily cause pulverized coal to spontaneously combust, posing a high risk. The pulverized coal needs to be discharged manually through the manhole, which is time-consuming and labor-intensive and has a great impact on the environment. Utility Model Content

[0006] In view of this, the utility model aims to propose a coal powder pouring device, that is, to pour the coal powder of the gasification series that needs to be repaired into the adjacent operating series equipment without interfering with the normal operation of the operating series. The specific contents of the utility model are as follows.

[0007] A coal powder dumping device comprises a dumping pipeline assembly, a first coal powder bin and a second coal powder bin arranged adjacent to each other; a feeding assembly is independently arranged above the first coal powder bin and the second coal powder bin; the dumping pipeline assembly is used to connect the feeding assembly above the first coal powder bin and the receiving assembly of the second coal powder bin.

[0008] The feed assembly includes at least n groups of feed parts, n is greater than or equal to 1, and the feed parts include a feed pipe, a connecting pipe and a pressure reducing pipe connected in sequence, and the pressure reducing pipe is connected to the top of the coal powder bin; the coal powder bin is provided with a receiving assembly;

[0009] One end of the material pouring pipeline assembly is detachably connected to the feed pipe above the first coal powder bin, and the other end is connected to the material receiving assembly on the second coal powder bin.

[0010] Preferably, n≥4;

[0011] The upper part of the first pulverized coal bin includes a first A feed piece, a first B feed piece, a first C feed piece, and a first D feed piece.

[0012] Preferably, during normal operation, the pulverized coal enters the first pulverized coal bin through the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece;

[0013] When maintenance is required, the feed pipes of the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece are connected to one end of the pouring pipeline assembly through the pouring flange, and the other end of the pouring pipeline assembly is connected to the receiving assembly of the second pulverized coal bin, and the pulverized coal enters the second pulverized coal bin through the pouring flange, the pouring pipeline assembly, and the receiving assembly.

[0014] Preferably, the material discharge pipeline assembly comprises a front-end material discharge pipeline, a middle-end material discharge pipeline, and a final-end material discharge pipeline which are arranged in sequence;

[0015] The front section dumping pipeline is respectively connected to the feed pipes of the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece, and the front section dumping pipeline is connected to the feed pipes via a dumping flange; the end section dumping pipeline is connected to the receiving assembly on the second pulverized coal bin.

[0016] The material pouring pipeline assembly of the present application is only composed of a number of straight pipe sections, elbows, and flanges, and has a low investment.

[0017] Preferably, the front section material discharge pipeline, the middle section material discharge pipeline and the end section material discharge pipeline are connected by flanges;

[0018] The connecting pipe between the feeding pipe and the pressure reducing pipe is detachable.

[0019] Preferably, the front section of the material discharge pipeline is a 90° elbow; the rear section of the material discharge pipeline is a 90° elbow;

[0020] The middle section material discharge pipeline includes n short straight pipe sections and one long straight pipe section; n≥1.

[0021] Preferably, the relationship between the length of the short straight pipe section and the pipeline spacing between the feed pieces is:

[0022] L6=L AB =L BC =L CD ;

[0023] The length of the short straight pipe section is L6, cm;

[0024] The distance L between the first A feed piece and the first B feed piece AB , cm;

[0025] The distance L between the first B feed piece and the first C feed piece BC , cm;

[0026] The distance L between the first C feed piece and the first D feed piece CD , cm.

[0027] Preferably, the length of the long straight pipe section and the distance between the two pulverized coal bins are calculated as follows:

[0028] L7=L 1-4 -L5-L8;

[0029] The length of the long straight pipe section is L7, cm;

[0030] The projection length L between the first D feeding piece and the receiving component 1-4 , cm;

[0031] The radius of the front section discharge pipeline is L5, cm;

[0032] The radius of the final discharge pipeline is L8, cm.

[0033] Preferably, the material receiving assembly comprises a hand valve and a material receiving valve, which are arranged on the second pulverized coal bin from top to bottom through a pipeline; the hand valve is closed during non-maintenance periods to maintain isolation from the ambient atmosphere.

[0034] Preferably, a second A feed piece, a second B feed piece, a second C feed piece, and a second D feed piece are provided above the second coal powder bin; the second A feed piece, the second B feed piece, the second C feed piece, and the second D feed piece all include a feed pipe, a pouring flange, a connecting pipe, and a pressure reducing pipe; the coal powder enters the second coal powder bin through the feed pipe, the pouring flange, the connecting pipe, and the pressure reducing pipe.

[0035] The utility model provides a method for using a coal powder pouring device, S1: conveying coal powder to a coal powder bin through a normal process;

[0036] S2: The pulverized coal is transported to the adjacent pulverized coal bin through the dumping pipeline assembly.

[0037] Preferably, step S1 includes conveying the pulverized coal to the first pulverized coal bin through the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece; conveying the pulverized coal to the second pulverized coal bin through the second A feed piece, the second B feed piece, the second C feed piece, and the second D feed piece;

[0038] Step S2 includes:

[0039] A1: Discharge the n groups of feed parts above the first pulverized coal bin in turn; if n is greater than or equal to 1, remove the connecting pipe in any feed part above the first pulverized coal bin; connect its feed pipe to the discharge pipeline assembly; connect the other end of the discharge pipeline assembly to the receiving assembly of the second pulverized coal bin; and open the receiving manual valve to start discharging;

[0040] A2: Repeat the above step A1, and switch the front section of the material discharge pipeline assembly to the feed pipes of the n groups of feed parts above the first pulverized coal bin in turn, and disassemble or install the short straight pipe section during the switching process; the preferred material discharge sequence starts from the feed part closest to the second pulverized coal bin to the feed part farthest away;

[0041] A3: After the coal powder is discharged from all the feeding parts, the discharge pipeline assembly is removed and the connecting pipe removed in step A1 is restored to its original state.

[0042] The tops of the feed pipes of the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece are connected to the feed tank, and the coal powder remaining in all the cone sections at the bottom of the feed tank can be poured out without residue.

[0043] Compared with the prior art, the coal powder pouring device described in the utility model has the following advantages:

[0044] 1. The investment of the discharge pipeline assembly of the present application is low; the coal powder discharge process only requires the discharge pipeline to be connected to the discharge flange and the receiving pipe opening of the adjacent series of coal powder bins to discharge the coal powder, and multiple pulverized coal pipelines can be cut off for discharge; the coal powder discharge device has the advantages of simple operation, low investment, safety and reliability, low pollution, and no residue.

[0045] 2. The material unloading process of this application is simple to operate, with small workload and low labor intensity for workers;

[0046] 3. The material discharge pipeline of the present application is closed, and the coal powder will not leak into the environment, which is safe, reliable and has little pollution;

[0047] 4. This application can avoid the risk of coal powder being easily degraded during long-term storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0049] Figure 1 This is a schematic diagram of a coal powder pouring device according to an embodiment of the utility model;

[0050] Figure 2 This is a schematic diagram of the specific use of a coal powder pouring device described in an embodiment of the utility model.

[0051] Description of reference numerals:

[0052] 1. Feed pipe; 2. Connecting pipe; 3. Pressure reducing pipe; 4. Receiving valve; 5. Front section discharge pipeline; 6. Middle section discharge pipeline; 7. Discharge flange; 8. End section discharge pipeline; 9. Hand valve; 10. First pulverized coal bin; 11. Second pulverized coal bin. DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0055] A pulverized coal dumping device includes a dumping pipeline assembly, a first pulverized coal bin 10 and a second pulverized coal bin 11 arranged adjacent to each other; a feed assembly is independently arranged above the first pulverized coal bin 10 and the second pulverized coal bin 11; the dumping pipeline assembly is used to connect the feed assembly above the first pulverized coal bin 10 and the receiving assembly of the second pulverized coal bin 11. The feed assembly includes at least n groups of feed parts, n is greater than or equal to 1, and the feed parts include a feed pipe 1, a connecting pipe 2 and a pressure reducing pipe 3 connected in sequence, and the pressure reducing pipe 3 is connected to the top of the pulverized coal bin; the pulverized coal bin is provided with a receiving assembly;

[0056] One end of the material discharge pipeline assembly is detachably connected to the feed pipe 1 above the first coal powder bin 10 , and the other end is connected to the material receiving assembly on the second coal powder bin 11 .

[0057] n≥4;

[0058] The first pulverized coal bin 10 includes a first A feed piece, a first B feed piece, a first C feed piece, and a first D feed piece above it.

[0059] During normal operation, the pulverized coal enters the first pulverized coal bin 10 through the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece;

[0060] When maintenance is required, the feed pipe 1 of the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece is connected to one end of the pouring pipeline assembly through the pouring flange 7, and the other end of the pouring pipeline assembly is connected to the receiving assembly of the second pulverized coal bin 11, and the pulverized coal enters the second pulverized coal bin 11 through the pouring flange 7, the pouring pipeline assembly, and the receiving assembly.

[0061] The material discharge pipeline assembly includes a front-end material discharge pipeline 5, a middle-end material discharge pipeline 6, and a final-end material discharge pipeline 8 which are arranged in sequence;

[0062] The front-end dumping pipeline 5 is respectively connected to the feed pipes 1 of the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece, and the front-end dumping pipeline 5 is connected to the feed pipes 1 via a dumping flange 7; the final-end dumping pipeline 8 is connected to the receiving assembly on the second pulverized coal bin 11.

[0063] The front section material discharge pipeline 5, the middle section material discharge pipeline 6, and the end section material discharge pipeline 8 are connected by flanges;

[0064] The connecting pipe 2 between the feeding pipe 1 and the pressure reducing pipe 3 is detachable.

[0065] The front section discharge pipeline 5 is a 90° elbow; the rear section discharge pipeline 8 is a 90° elbow;

[0066] The middle section material discharge pipeline 6 comprises n short straight pipe sections and one long straight pipe section; n≥1.

[0067] The relationship between the length of the short straight pipe section and the pipeline spacing between the feed parts is:

[0068] L6 = LAB = LBC = LCD;

[0069] The length of the short straight pipe section is L6, cm;

[0070] The distance LAB between the first A feed piece and the first B feed piece, cm;

[0071] The distance LBC between the first B feed piece and the first C feed piece, cm;

[0072] The distance LCD between the first C feed piece and the first D feed piece, cm.

[0073] The calculation method of the length of the long straight pipe section and the distance between the two pulverized coal bins is:

[0074] L7 = L1-4-L5-L8;

[0075] The length of the long straight pipe section is L7, cm;

[0076] The projection length between the first D feeding piece and the receiving component is L1-4, cm;

[0077] The radius of the front section discharge pipeline 5 is L5, cm;

[0078] The radius of the final discharge pipeline 8 is L8 cm.

[0079] The receiving assembly includes a hand valve 9 and a receiving valve 4, which are arranged on the second pulverized coal bin 11 from top to bottom through pipelines; the hand valve 9 is closed during non-maintenance periods to maintain isolation from the ambient atmosphere.

[0080] A second A feed piece, a second B feed piece, a second C feed piece, and a second D feed piece are provided above the second pulverized coal bin 11; the second A feed piece, the second B feed piece, the second C feed piece, and the second D feed piece all include a feed pipe 1, a pouring flange 7, a connecting pipe 2, and a pressure reducing pipe 3; the pulverized coal enters the second pulverized coal bin 11 through the feed pipe 1, the pouring flange 7, the connecting pipe 2, and the pressure reducing pipe 3.

[0081] A method for using a pulverized coal dumping device, S1: transporting pulverized coal to a pulverized coal bin through a normal process;

[0082] S2: The pulverized coal is transported to the adjacent pulverized coal bin through the dumping pipeline assembly.

[0083] Step S1 includes conveying the pulverized coal to the first pulverized coal bin 10 through the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece; conveying the pulverized coal to the second pulverized coal bin 11 through the second A feed piece, the second B feed piece, the second C feed piece, and the second D feed piece;

[0084] Step S2 includes:

[0085] A1: Discharge the n groups of feed parts above the first pulverized coal bin 10 in turn; if n is greater than or equal to 1, remove the connecting pipe 2 in any feed part above the first pulverized coal bin 10; connect its feed pipe 1 to the discharge pipeline assembly; connect the other end of the discharge pipeline assembly to the receiving assembly of the second pulverized coal bin 11; and open the receiving hand valve 9 to start discharging;

[0086] A2: Repeat the above step A1, and switch the connection between the front section of the dumping pipeline 5 of the dumping pipeline assembly and the feed pipes 1 of the n groups of feed parts above the first pulverized coal bin 10 in turn, and disassemble or install the short straight pipe section during the switching process; the dumping sequence is preferably started from the feed part closest to the second pulverized coal bin 11 to the feed part farthest away;

[0087] A3: After the coal powder is discharged from all the feeding parts, the discharge pipeline assembly is removed and the connecting pipe 2 removed in step A1 is restored to its original state.

[0088] Example 1

[0089] The working condition of dumping from the pulverized coal bin to the adjacent pulverized coal bin occurs when the gasifier of this series is shut down for a long time and the pulverized coal bin, pulverized coal lock hopper and feeding tank of this series need to be emptied. Since the pulverized coal bin, lock hopper and feeding tank are equipment in series, the pulverized coal can be transported from the pulverized coal pipeline to the pulverized coal bin of the adjacent series along the process of pulverized coal bin, lock hopper and feeding tank. Figure 2 As shown, taking the overhaul series to the operating pulverized coal bin as an example, the material discharge plan is described as follows.

[0090] The first step is to remove the pulverized coal pipeline from the first D feed piece closest to the running series to the pressure reducing pipe 3, and then replace it with the dumping pipeline shown in the dotted line in the figure below. The dumping pipeline consists of three sections of pipelines: the front dumping pipeline 5 (front 90° elbow), the middle dumping pipeline 6 and the end dumping pipeline 8 (90° elbow + short straight pipe section). The three sections are connected by flanges and finally connected to the hand valve 9 and the receiving pipe mouth. After the temporary dumping pipeline is installed, the dumping process can be manually controlled through the hand valve 9. The first D feed piece can transport most of the straight section of the maintenance series pulverized coal feeding tank and all the D cones of pulverized coal to the running series pulverized coal bin, leaving the pulverized coal in the three cones ABC of the pulverized coal feeding tank.

[0091] In the second step, the front section of the dumping pipeline 5 on the first D feed piece is removed, and a short straight pipe section (middle section dumping pipeline 6) is inserted between the front section of the dumping pipeline 5 and the long straight pipe section, and connected to the first C feed piece. After the temporary dumping pipeline is installed, all the coal powder in the C cone of the maintenance series coal powder feeding tank can be transported to the running series coal powder bin through the hand valve 9, leaving the coal powder in the two cones of the coal powder feeding tank AB.

[0092] In the third step, the front section of the dumping pipeline 5 on the first C feed piece is removed, and a short straight pipe section (middle section dumping pipeline 6) is inserted into the dumping pipeline described in the second step, and connected to the first B feed piece. This step transports all the pulverized coal in the maintenance series B cone to the running series pulverized coal bin, leaving the pulverized coal in the A cone of the pulverized coal feed tank.

[0093] In the fourth step, the front section of the dumping pipeline 5 on the first B feed piece is removed, and a short straight pipe section (middle section dumping pipeline 6) is inserted into the dumping pipeline described in the third step, and connected to the first A feed piece. This step transports all the pulverized coal in the A cone of the maintenance series pulverized coal feed tank to the running series pulverized coal bin.

[0094] At this point, after the above four steps are completed, all the coal powder in the maintenance series coal powder feeding tank can be transferred to the adjacent operating series coal powder bin.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulverized coal pouring device, characterized in that: It includes a dumping pipeline assembly, a first pulverized coal bin and a second pulverized coal bin arranged adjacent to each other; a feeding assembly is independently arranged above the first pulverized coal bin and the second pulverized coal bin; the dumping pipeline assembly is used to connect the feeding assembly above the first pulverized coal bin and the receiving assembly of the second pulverized coal bin.

2. A pulverized coal pouring device according to claim 1, characterized in that: The feed assembly includes at least n groups of feed parts, n is greater than or equal to 1, and the feed parts include a feed pipe, a connecting pipe and a pressure reducing pipe connected in sequence, and the pressure reducing pipe is connected to the top of the coal powder bin; the coal powder bin is provided with a receiving assembly; One end of the material pouring pipeline assembly is detachably connected to the feed pipe above the first coal powder bin, and the other end is connected to the material receiving assembly on the second coal powder bin.

3. A pulverized coal pouring device according to claim 2, characterized in that: n≥4； The upper part of the first pulverized coal bin includes a first A feed piece, a first B feed piece, a first C feed piece, and a first D feed piece.

4. A pulverized coal pouring device according to claim 3, characterized in that: During normal operation, the pulverized coal enters the first pulverized coal bin through the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece; When maintenance is required, the feed pipes of the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece are connected to one end of the pouring pipeline assembly through the pouring flange, and the other end of the pouring pipeline assembly is connected to the receiving assembly of the second pulverized coal bin, and the pulverized coal enters the second pulverized coal bin through the pouring flange, the pouring pipeline assembly, and the receiving assembly.

5. A pulverized coal pouring device according to claim 2, characterized in that: The material discharge pipeline assembly includes a front-end material discharge pipeline, a middle-end material discharge pipeline, and a terminal material discharge pipeline which are arranged in sequence; The front section dumping pipeline is respectively connected to the feed pipes of the first A feed piece, the first B feed piece, the first C feed piece, and the first D feed piece, and the front section dumping pipeline is connected to the feed pipes via a dumping flange; the end section dumping pipeline is connected to the receiving assembly on the second pulverized coal bin.

6. A pulverized coal pouring device according to claim 5, characterized in that: The front section material discharge pipeline, the middle section material discharge pipeline and the end section material discharge pipeline are connected by flanges; The connecting pipe between the feeding pipe and the pressure reducing pipe is detachable.

7. A pulverized coal pouring device according to claim 5, characterized in that: The front section of the material discharge pipeline is a 90° elbow; the end section of the material discharge pipeline is a 90° elbow; The middle section material discharge pipeline includes n short straight pipe sections and one long straight pipe section; n≥1.

8. A pulverized coal pouring device according to claim 7, characterized in that: The relationship between the length of the short straight pipe section and the pipeline spacing between the feed parts is: L6=L AB =L BC =L CD ; The length of the short straight pipe section is L6, cm; The distance L between the first A feed piece and the first B feed piece AB , cm; The distance L between the first B feed piece and the first C feed piece BC , cm; The distance L between the first C feed piece and the first D feed piece CD , cm; The length of the long straight pipe section and the distance between the two pulverized coal bins are calculated as follows: <h2 style=";text-align:left;direction:ltr">L7=L<h2 style=";text-align:left;direction:ltr"> 1-4 <h2 style=";text-align:left;direction:ltr"> -L5-L8; The length of the long straight pipe section is L7, cm; The projection length L between the first D feeding piece and the receiving component 1-4 , cm; The radius of the front section discharge pipeline is L5, cm; The radius of the final discharge pipeline is L8, cm.

9. A pulverized coal pouring device according to claim 2, characterized in that: The material receiving assembly comprises a hand valve and a material receiving valve, which are arranged on the second pulverized coal bin from top to bottom through a pipeline; the hand valve is closed during non-maintenance periods to maintain isolation from the ambient atmosphere.

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