Automatic analysis and solution system for pulverized coal injection fault of blast furnace

Abstract

The utility model belongs to the technical field of blast furnace smelting pulverized coal injection, and particularly relates to a blast furnace pulverized coal injection fault automatic analyzing and solving system which comprises a nitrogen input pipeline, a low-pressure nitrogen branch, a medium-pressure nitrogen branch, a nitrogen header pipe, a coal injection adjusting branch, a coal injection pipeline, a high-pressure purging branch and a blast furnace body. A manual ball valve I, a pressure transmitter I and a filter are sequentially mounted on the nitrogen input pipeline from front to back; the two sides of the output end of the nitrogen input pipeline are connected with a low-pressure nitrogen branch and a medium-pressure nitrogen branch respectively, and a first pressure reducing valve, a first pneumatic stop valve, a second pressure transmitter, a first one-way valve and a first gas storage tank are sequentially installed on the low-pressure nitrogen branch from front to back. Blockage detection of the blast furnace coal injection tuyere, intelligent switching of the blast furnace coal injection channel and high-pressure purging re-opening of the blast furnace coal injection channel can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace smelting coal powder injection, and particularly relates to a blast furnace coal powder injection fault automatic analysis and solution system. Background Art

[0002] Pulverized coal injection (PCI) in modern blast furnaces involves injecting finely ground anthracite, bituminous coal, or a mixture of both directly into the blast furnace through the tuyere. This replaces coke, providing heat and a reducing agent, thereby lowering the coke ratio and reducing pig iron costs. Pulverized coal injection in the blast furnace provides the heat required for the smelting process, acts as a reducing agent for reducing iron ore, and maintains the permeability of the charge column (particularly in the soft melting zone and below).

[0003] During the blast furnace shutdown and restart phases, when the hot blast pressure exceeds the pressure in the coal injection channel, flashback can easily occur, leading to smelting safety accidents. At this time, the multiple valves in the coal injection channel must be manually closed. However, since the coal injection pipeline is located in the blast furnace itself, the operation is carried out at high altitude, which brings inconvenience and lacks safety. Summary of the Invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the utility model provides an automatic analysis and solution system for blast furnace coal powder injection faults. By utilizing the automation system in combination with multiple feedback valve body signals, it can intelligently detect pipeline pressure and flow changes to analyze and judge the real-time situation of the current smelting, and can further realize blast furnace coal injection port blockage detection, blast furnace coal injection channel intelligent switching and blast furnace coal injection channel high-pressure purge and reopening, thereby avoiding heat loss in the furnace caused by the stop of blast furnace coal powder injection, and at the same time avoiding the inconvenience of manual maintenance due to the stop of blast furnace coal powder injection, and is better to use.

[0005] To achieve the above-mentioned object, the utility model provides the following technical solutions: a blast furnace pulverized coal injection fault automatic analysis and solution system, comprising a nitrogen input pipeline, a low-pressure nitrogen branch, a medium-pressure nitrogen branch, a nitrogen main pipe, a coal injection regulating branch, a coal injection pipeline, a high-pressure purge branch and a blast furnace body;

[0006] The nitrogen input pipeline is sequentially installed with a manual ball valve, a pressure transmitter and a filter from front to back;

[0007] The output end of the nitrogen input pipeline is connected to a low-pressure nitrogen branch and a medium-pressure nitrogen branch on both sides, and the low-pressure nitrogen branch is installed with a pressure reducing valve, a pneumatic shut-off valve, a pressure transmitter, a check valve and a gas storage tank in sequence from front to back;

[0008] The medium-pressure nitrogen branch line is equipped with a second pressure reducing valve, a second pneumatic shut-off valve, a third pressure transmitter, a second check valve and a second gas storage tank from front to back.

[0009] The output end of the low-pressure nitrogen gas branch and the output end of the medium-pressure nitrogen gas branch are commonly connected with a nitrogen gas main pipe, a one-way valve three is arranged on the nitrogen gas main pipe, and the output end of the nitrogen gas main pipe is connected with a pulverized coal mixing distributor;

[0010] The output end of the pulverized coal mixing distributor is connected with a road coal injection adjusting branch, a manual ball valve two, a pneumatic adjusting valve, a one-way valve four and a pressure transmitter four are sequentially arranged on the coal injection adjusting branch from front to back, and the output end of the coal injection adjusting branch is connected with a coal injection pipeline.

[0011] The output end of the coal injection pipeline is connected with the input end of a blast furnace body.

[0012] One side of the nitrogen gas main pipe is connected with a road high-pressure purging branch, a manual ball valve three, an electromagnetic valve and a one-way valve five are sequentially arranged on the high-pressure purging branch from front to back, the output end of the high-pressure purging branch is connected with one side of the coal injection adjusting branch, and the connecting position is between the one-way valve four and the pressure transmitter four.

[0013] As the preferred technical scheme of the blast furnace coal powder injection fault automatic analysis and solution system, a pressure gauge one is arranged on the low-pressure nitrogen gas branch and located between the pneumatic cut-off valve one and the pressure transmitter two.

[0014] As the preferred technical scheme of the blast furnace coal powder injection fault automatic analysis and solution system, a pressure gauge two is arranged on the medium-pressure nitrogen gas branch and located between the pneumatic cut-off valve two and the pressure transmitter three.

[0015] Compared with the prior art, the blast furnace coal powder injection fault automatic analysis and solution system has the following beneficial effects:

[0016] 1. When the blast furnace coal powder injection fault automatic analysis and solution system is used, the medium-pressure nitrogen gas is divided into a low-pressure nitrogen gas branch and a medium-pressure nitrogen gas branch after passing through a filter, the pressure transmitter two and the pressure transmitter three can collect pressure data, when the pressure of the low-pressure nitrogen gas branch is low, the pneumatic cut-off valve one on the low-pressure nitrogen gas branch is closed, and the pneumatic cut-off valve two on the medium-pressure nitrogen gas branch is opened, so that the pulverized coal mixing distributor can be provided with a gas source.

[0017] 2. The output ends of the low-pressure nitrogen gas branch and the medium-pressure nitrogen gas branch are combined into the nitrogen gas main pipe to enter the pulverized coal mixing distributor, the road coal injection adjusting branch is branched out from the side of the pulverized coal mixing distributor, the pneumatic adjusting valve with feedback is arranged on the coal injection adjusting branch, the size of the pulverized coal injection amount of each coal injection adjusting branch can be adjusted individually, and the pressure transmitter four is arranged on the coal injection adjusting branch, so that the pressure of the outlet can be monitored in real time.

[0018] 3、The utility model discloses nitrogen main pipe side leads out road high pressure purging branch as side blowing branch, and electromagnetic valve is installed on high pressure purging branch, can control gas, when the export pressure of coal injection regulation branch is too high, corresponding electromagnetic valve on high pressure purging branch opens, can carry out side blowing and block operation.

[0019] 4、The utility model discloses one -way valve one, one -way valve two, one -way valve three, one -way valve four, one -way valve five can play the protection effect, can avoid the coal dust reverse into filter, pressure reducing valve one, pressure reducing valve two, electromagnetic valve and other components, protect the equipment from being damaged.

[0020] 5、The utility model discloses through above -mentioned technical scheme's design, make blast furnace injection coal powder can many channel intelligent switching;Blast furnace injection coal powder can intelligent detection, can in time stop coal and supplement gas, avoid the phenomenon of reannealing;Blast furnace injection coal powder can pipeline automatic dredging, save the labor, avoid high altitude construction risk;Can in time detect blast furnace branch injection coal powder pipeline change, intelligent judgment blast furnace injection coal powder pipeline's blockage situation, high pressure pulse purging and in time dredging, use better. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and are used to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0022] Fig. 1 It is the structural schematic diagram of the utility model;

[0023] Fig. 2 It is the low pressure nitrogen branch, medium pressure nitrogen branch connecting structure schematic diagram of the utility model;

[0024] In the drawing: 101, nitrogen input pipeline;102, hand ball valve one;103, pressure transmitter one;104, filter;105, low pressure nitrogen branch;106, pressure reducing valve one;107, pneumatic cut -off valve one;108, pressure gauge one;109, pressure transmitter two;110, one -way valve one;111, gas tank one;112, medium pressure nitrogen branch;113, pressure reducing valve two;114, pneumatic cut -off valve two;115, pressure gauge two;116, pressure transmitter three;117, one -way valve two;118, gas tank two;119, nitrogen main pipe;120, one -way valve three;121, coal powder mixing distributor;122, coal injection regulation branch;123, hand ball valve two;124, pneumatic regulating valve;125, one -way valve four;126, pressure transmitter four;127, coal injection pipeline;128, high pressure purging branch;129, hand ball valve three;130, electromagnetic valve;131, one -way valve five;132, blast furnace body. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Embodiments

[0026] Please refer to Figs. 1-2 The present application provides the following technical solutions: a blast furnace coal powder injection fault automatic analysis and solution system, comprising a nitrogen input pipeline 101, a low-pressure nitrogen branch 105, a medium-pressure nitrogen branch 112, a nitrogen main pipe 119, a coal injection adjustment branch 122, a coal injection pipeline 127, a high-pressure purge branch 128 and a blast furnace body 132.

[0027] Further, the manual ball valve one 102, the pressure transmitter one 103 and the filter 104 are sequentially installed on the nitrogen input pipeline 101 from front to back.

[0028] Further, the low-pressure nitrogen branch 105 and the medium-pressure nitrogen branch 112 are respectively connected on both sides of the output end of the nitrogen input pipeline 101, the pressure reducing valve one 106, the pneumatic shut-off valve one 107, the pressure gauge one 108, the pressure transmitter two 109, the check valve one 110 and the gas storage tank one 111 are sequentially installed on the low-pressure nitrogen branch 105 from front to back.

[0029] Further, the pressure reducing valve two 113, the pneumatic shut-off valve two 114, the pressure gauge two 115, the pressure transmitter three 116, the check valve two 117 and the gas storage tank two 118 are sequentially installed on the medium-pressure nitrogen branch 112 from front to back.

[0030] Further, the output end of the low-pressure nitrogen branch 105 and the output end of the medium-pressure nitrogen branch 112 are commonly connected with the nitrogen main pipe 119, the check valve three 120 is arranged on the nitrogen main pipe 119, and the output end of the nitrogen main pipe 119 is connected with the coal powder mixing distributor 121.

[0031] Further, the output end of the coal powder mixing distributor 121 is connected with the 32-way coal injection adjustment branch 122, the manual ball valve two 123, the pneumatic regulating valve 124, the check valve four 125 and the pressure transmitter four 126 are sequentially installed on the coal injection adjustment branch 122 from front to back.

[0032] Further, the output end of the coal injection adjustment branch 122 is connected with the coal injection pipeline 127, the coal injection pipeline 127 is also 32-way, and the output end of the coal injection pipeline 127 is connected with the input end of the blast furnace body 132.

[0033] Further, one side of the nitrogen main pipe 119 is connected with 32 high-pressure purging branches 128, the high-pressure purging branches 128 are sequentially provided with a manual ball valve three 129, an electromagnetic valve 130 and a one-way valve five 131 from front to back, and an output end of the high-pressure purging branches 128 is connected with one side of the coal injection adjusting branch 122 and the connection position is between the one-way valve four 125 and the pressure transmitter four 126.

[0034] The working principle of the utility model is: the medium-pressure nitrogen is divided into a low-pressure nitrogen branch 105 and a medium-pressure nitrogen branch 112 after passing through the filter 104, the pressure transmitter two 109 and the pressure transmitter three 116 can collect pressure data, when the pressure of the low-pressure nitrogen branch 105 is low, the pneumatic cut-off valve one 107 on the low-pressure nitrogen branch 105 is closed, the pneumatic cut-off valve two 114 on the medium-pressure nitrogen branch 112 is opened, and the low-pressure nitrogen branch 105 can provide a gas source for the pulverized coal mixing distributor 121;

[0035] The output ends of the low-pressure nitrogen branch 105 and the medium-pressure nitrogen branch 112 are combined into the nitrogen main pipe 119 and enter the pulverized coal mixing distributor 121, 32 coal injection adjusting branches 122 are branched from the pulverized coal mixing distributor 121, the coal injection adjusting branches 122 are provided with feedback pneumatic regulating valves 124, the size of the pulverized coal injection amount of each coal injection adjusting branch 122 can be individually adjusted, and the coal injection adjusting branches 122 are provided with the pressure transmitter four 126, which can monitor the pressure of the outlet in real time;

[0036] The nitrogen main pipe 119 is branched into 32 high-pressure purging branches 128 as side blowing branches, and the high-pressure purging branches 128 are provided with the electromagnetic valve 130, which can control the gas, when the outlet pressure of the coal injection adjusting branch 122 is too high, the electromagnetic valve 130 on the high-pressure purging branch 128 is opened, and the side blowing and unblocking operation can be performed;

[0037] The one-way valve one 110, the one-way valve two 117, the one-way valve three 120, the one-way valve four 125 and the one-way valve five 131 can play a protection role, can avoid the pulverized coal from entering the filter 104, the pressure reducing valve one 106, the pressure reducing valve two 113 and the electromagnetic valve 130, and protect the equipment from being damaged.

[0038] Through the design of the above technical scheme, the blast furnace coal injection can be intelligently switched in multiple channels; the blast furnace coal injection can be intelligently detected, the coal injection can be stopped in time and the gas can be supplied, the backfire phenomenon can be avoided; the blast furnace coal injection pipeline can be automatically dredged, labor can be saved, and the risk of high-altitude construction can be avoided; the change of the blast furnace coal injection pipeline can be detected in time, the blockage of the blast furnace coal injection pipeline can be intelligently judged, the high-pressure pulse purging can be dredged in time, and the use is better.

[0039] In addition, the contents not described in detail in the embodiment are in the category of prior art and common knowledge.

[0040] It should be pointed out finally that: the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiment, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement is made to part of technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. Automatic analysis and solution system for blast furnace pulverized coal injection faults, characterized by: It includes a nitrogen input pipeline (101), a low-pressure nitrogen branch (105), a medium-pressure nitrogen branch (112), a nitrogen main pipe (119), a coal injection regulating branch (122), a coal injection pipeline (127), a high-pressure purge branch (128) and a blast furnace body (132); The nitrogen input pipeline (101) is provided with a manual ball valve (102), a pressure transmitter (103) and a filter (104) in sequence from the front to the back of the nitrogen input pipeline (101); The output end of the nitrogen input pipeline (101) is connected to a low-pressure nitrogen branch (105) and a medium-pressure nitrogen branch (112) on both sides, and the low-pressure nitrogen branch (105) is sequentially installed with a pressure reducing valve (106), a pneumatic shut-off valve (107), a pressure transmitter (109), a one-way valve (110) and a gas storage tank (111) from front to back; The medium-pressure nitrogen branch (112) is provided with a second pressure reducing valve (113), a second pneumatic shut-off valve (114), a third pressure transmitter (116), a second check valve (117) and a second gas storage tank (118) in sequence from front to back; The output end of the low-pressure nitrogen branch (105) and the output end of the medium-pressure nitrogen branch (112) are commonly connected to a nitrogen main pipe (119), a one-way valve (120) is provided on the nitrogen main pipe (119), and the output end of the nitrogen main pipe (119) is connected to a pulverized coal mixing distributor (121); The output end of the pulverized coal mixing distributor (121) is connected to a 32-way coal injection regulating branch (122), and the coal injection regulating branch (122) is sequentially installed with a second manual ball valve (123), a pneumatic regulating valve (124), a fourth check valve (125), and a fourth pressure transmitter (126) from front to back; The output end of the coal injection regulating branch (122) is connected to a coal injection pipeline (127), and the output end of the coal injection pipeline (127) is connected to the input end of the blast furnace body (132); One side of the nitrogen main pipe (119) is connected to a 32-way high-pressure purge branch (128), and a manual ball valve (3) (129), a solenoid valve (130) and a one-way valve (5) (131) are installed on the high-pressure purge branch (128) in sequence from front to back, and the output end of the high-pressure purge branch (128) is connected to one side of the coal injection regulating branch (122), and the connection point is located between the one-way valve (4) (125) and the pressure transmitter (4) (126).

2. The automatic analysis and solution system for blast furnace pulverized coal injection faults according to claim 1 is characterized in that: A pressure gauge 1 (108) is installed on the low-pressure nitrogen branch (105), and the pressure gauge 1 (108) is located between the pneumatic shut-off valve 1 (107) and the pressure transmitter 2 (109).

3. The automatic analysis and solution system for blast furnace pulverized coal injection faults according to claim 1 is characterized in that: A second pressure gauge (115) is installed on the medium-pressure nitrogen branch (112), and the second pressure gauge (115) is located between the second pneumatic shut-off valve (114) and the third pressure transmitter (116).

Images