A dry coke quenching dust removal pneumatic ash conveying system

Abstract

The invention relates to the field of dry coke quenching process, and is used to solve the problem that a large amount of nitrogen is discharged in the dry coke quenching production process, which increases the cost of dry coke quenching production. The invention specifically relates to a dry coke quenching dust removal pneumatic ash conveying system, which comprises a gas conveying unit, a dust removal and filtering unit, a filtering and cleaning unit and a nitrogen recovery unit. During the operation of the ash conveying system, the nitrogen used for ash conveying is collected, so that the collected nitrogen is reused, and the nitrogen is avoided from being directly discharged into the air to cause nitrogen waste, thereby realizing the recycling of nitrogen and reducing the nitrogen consumption cost. At the same time, by analyzing the filtering performance of the tail end dust removal device, visual monitoring of the dust removal device is realized, and automatic cleaning of the dust removal device is realized by pulse recoil, so as to ensure that the filtering performance of the ash conveying system is in a normal working condition, and at the same time, it is avoided that the filter screen is cleaned manually based on experience, thereby improving the timeliness of the filter screen cleaning.

Description

Technical Field

[0001] The invention relates to the field of dry coke quenching technology, in particular to a dry coke quenching dust removal pneumatic ash conveying system. Background Art

[0002] As an important part of coke production, dry coke quenching is a set of equipment that uses inert gas to cool red coke in a closed system. Dry coke quenching uses inert gas as circulating gas to cool red-hot coke in a dry quenching furnace. After absorbing the sensible heat of the red coke, it enters the waste heat boiler to generate medium-pressure steam for power generation. The inert gas is circulated in a closed system. Dry coke quenching is superior to wet coke quenching in terms of energy saving, environmental protection and improvement of coke quality.

[0003] However, the CDQ system currently has major nitrogen charging points at the fan inlet and primary dust removal. After the primary dust removal and nitrogen charging, the nitrogen is released into the atmosphere through the pre-storage section pressure regulating valve. Nitrogen is charged at the fan inlet and part of the circulating gas after the fan is directly released into the atmosphere. The nitrogen used in the pneumatic ash conveying system is discharged into the atmosphere after being filtered, which leads to a large amount of nitrogen emission in the CDQ production process and increases the cost of CDQ production. Therefore, it is a crucial issue to be solved to recycle and reuse the nitrogen originally discharged into the atmosphere through a nitrogen recovery device.

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] The present invention collects nitrogen used for ash conveying during the operation of the ash conveying system, so that the collected nitrogen can be reused, avoiding nitrogen waste caused by direct discharge into the air, thereby realizing the recycling of nitrogen and reducing the nitrogen consumption cost. The problem of large-scale nitrogen discharge in the dry coke quenching production process and increased dry coke quenching production cost is solved, and a dry coke quenching dust removal pneumatic ash conveying system is proposed.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A dry coke quenching dust removal pneumatic ash conveying system, comprising a gas conveying unit, wherein the gas conveying unit is used to control nitrogen delivery and obtain nitrogen intake parameters;

[0008] A dust removal and filtration unit, which is used to obtain parameters in the nitrogen filtration process, and analyze the efficiency of dust removal according to the obtained parameters to obtain the operating conditions of the dust removal net;

[0009] A filter cleaning unit, wherein the filter cleaning unit receives the operating condition of the dust removal net through the dust removal filter unit, and automatically matches the corresponding dust removal net cleaning process when the operating condition of the dust removal net is not good;

[0010] A nitrogen recovery unit, which is used to recover the nitrogen at the tail end and collect nitrogen recovery data during the nitrogen recovery process to obtain nitrogen recovery parameters;

[0011] The nitrogen recovery unit and the gas delivery unit communicate data with each other, compare the nitrogen intake parameters with the nitrogen recovery parameters, obtain the nitrogen recovery effect, judge the nitrogen recovery effect, and generate an intelligent alarm.

[0012] As a preferred embodiment of the present invention, the intake parameters collected by the gas delivery unit include intake flow rate and intake pressure;

[0013] The nitrogen recovery parameters collected by the nitrogen recovery unit include recovery flow rate and recovery gas pressure;

[0014] The nitrogen recovery unit selects a preset time range, performs arithmetic averaging on the recovery gas pressure within the preset time range, and obtains the recovery average gas pressure; the gas delivery unit obtains the same preset time range, performs arithmetic averaging on the intake gas pressure within the preset time range, and obtains the intake average gas pressure;

[0015] The nitrogen recovery unit calculates the difference between the average intake pressure and the average recovery pressure, and records the difference as pressure loss;

[0016] The nitrogen recovery unit performs integral calculations on the recovery flow rate and the time element within a preset time range to obtain a total recovery flow rate within the preset time range, and the gas delivery unit performs integral calculations on the intake flow rate and the time element within the preset time range to obtain a total intake flow rate within the preset time range;

[0017] The nitrogen recovery unit calculates the difference between the total intake flow and the total recovery flow to obtain the flow loss, and calculates the ratio of the flow loss to the preset time range length to obtain the flow loss rate.

[0018] As a preferred embodiment of the present invention, the nitrogen recovery unit performs threshold analysis on the flow loss rate and the gas pressure loss, and generates an alarm of insufficient recovery effect if either the flow loss rate or the gas pressure loss exceeds a preset threshold.

[0019] As a preferred embodiment of the present invention, the gas delivery unit compares the intake air flow rate with the required ash delivery gas flow rate, and if the intake air flow rate is less than the ash delivery gas flow rate, an intake air shortage signal is generated to increase the intake air volume of the gas delivery device;

[0020] If the intake air flow is not less than the ash conveying gas flow, the difference between the intake air flow and the ash conveying gas flow is calculated. If the difference is greater than a preset value, an intake redundancy signal is generated to reduce the intake volume of the gas conveying equipment.

[0021] As a preferred embodiment of the present invention, the gas delivery unit calculates the difference between the maximum value and the minimum value of the intake air pressure to obtain the fluctuation amplitude of the intake air pressure;

[0022] The gas delivery unit calculates the difference between the two groups of intake air pressures at all adjacent time points to obtain the pressure change speed, and averages the change speeds of all intake air pressures to obtain the intake air pressure fluctuation mean;

[0023] The gas delivery unit analyzes the fluctuation amplitude of the intake air pressure and the fluctuation mean of the intake air pressure, obtains the stability of the intake air pressure according to the analysis result, and compares the intake air pressure stability with a preset stability threshold. If the intake air pressure stability is not greater than the preset stability, an intake abnormality signal is generated and sent to the gas delivery device and display device module.

[0024] As a preferred embodiment of the present invention, the filter parameters collected by the dust removal and filtering unit include the air pressure at both ends of the filter and the impact force of the filter. The dust removal and filtering unit compares the air pressure at both ends of the filter to obtain the air pressure difference at both ends of the filter;

[0025] The dust removal and filtering unit records the pressure difference at both ends of the filter as FC, records the area of ​​each mesh in the filter as S, and records the number of filters as N, where the number of filters is the number of meshes per unit area of ​​the filter. The dust removal and filtering unit generates the first filter blockage degree D1 through formula analysis. .

[0026] As a preferred embodiment of the present invention, the dust removal and filtering unit records the total area of ​​the filter as A, records the impact force of the filter as FT, and generates the second clogging degree D2 of the filter through formula analysis. .

[0027] As a preferred embodiment of the present invention, the dust removal and filtering unit compares the first blockage degree with the second blockage degree, and if the difference between the first blockage degree and the second blockage degree is greater than a preset value, a calculation abnormality signal is generated, and the new first blockage degree and the second blockage degree are re-collected and calculated, and if the difference is still greater than the preset value, a collection abnormality signal is generated;

[0028] If the difference between the first blockage degree and the second blockage degree is less than a preset value, the first blockage degree and the second blockage degree are averaged, and the averaged result is sent to the filter cleaning unit as the operating condition of the dust removal net;

[0029] After acquiring the operating condition of the dust removal net, the filtering and cleaning unit compares the operating condition of the dust removal net with a preset blockage level, confirms the blockage level of the dust removal net, and calls a pulse generator of corresponding intensity according to the blockage level of the dust removal net.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the present invention, during the operation of the ash conveying system, the nitrogen used for ash conveying is collected, so that the collected nitrogen can be reused, avoiding the nitrogen being directly discharged into the air and causing nitrogen waste, thereby realizing the recycling of nitrogen and reducing the nitrogen consumption cost.

[0032] 2. In the present invention, during the nitrogen recovery process, the parameters of nitrogen input and nitrogen recovery are collected, and the collected parameters are quantitatively analyzed and recovered to obtain the nitrogen recovery effect, and the nitrogen recovery effect is verified, thereby realizing an intelligent alarm for the nitrogen recovery effect and ensuring that the nitrogen recovery effect is controllable.

[0033] 3. In the present invention, in the ash conveying system, by analyzing the filtering performance of the tail-end dust removal device, visual monitoring of the dust removal device is achieved, and when the dust removal device is blocked, the dust removal device is automatically cleaned by pulse recoil to ensure that the filtering performance of the ash conveying system is in normal working conditions. At the same time, manual cleaning of the filter based on experience is avoided, thereby improving the timeliness and economy of the filter cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0035] Figure 1 is a system block diagram of the present invention;

[0036] Figure 2 It is a system flow chart of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] See also Figure 1 - Figure 2As shown, a dry coke quenching dust removal pneumatic ash conveying system includes a gas conveying unit, a dust removal and filtering unit, a filtering and cleaning unit and a nitrogen recovery unit. The gas conveying unit controls the high-pressure gas to flow in the ash conveying pipeline, and collects the intake parameters when the high-pressure gas enters the ash conveying pipeline, wherein the intake parameters include the intake flow rate and the intake pressure;

[0040] After the gas delivery unit obtains the intake air flow, it compares the intake air flow with the required ash delivery gas flow. If the intake air flow is less than the ash delivery gas flow, an insufficient intake air signal is generated and sent to the gas delivery device, so that the gas delivery device increases the intake air volume.

[0041] If the intake air flow is not less than the ash conveying gas flow, the difference between the intake air flow and the ash conveying gas flow is calculated. If the difference is not greater than a preset value, a normal intake signal is generated to maintain the intake volume of the gas conveying device through the normal intake signal. If the difference is greater than a preset value, a redundant intake signal is generated and sent to the gas conveying device to reduce the intake volume of the gas conveying device.

[0042] After the gas delivery unit obtains the intake air pressure, it collects statistics on the intake air pressure at different time points, and obtains the fluctuation amplitude of the intake air pressure by calculating the difference between the maximum and minimum values ​​of the intake air pressure;

[0043] The gas delivery unit calculates the difference between two groups of intake air pressures at adjacent time points to obtain the pressure change speed. After calculating the change speeds of the two groups of intake air pressures at all adjacent time points, the gas delivery unit averages all the change speeds of the intake air pressures to obtain the intake air pressure fluctuation mean.

[0044] The gas delivery unit calculates and analyzes the fluctuation amplitude of the intake air pressure and the fluctuation mean of the intake air pressure, obtains the stability of the intake air pressure according to the calculation and analysis results, and compares the intake air pressure stability with the preset stability threshold. If the intake air pressure stability is greater than the preset stability threshold, a normal intake signal is generated; if the intake air pressure stability is not greater than the preset stability, an abnormal intake signal is generated. When the abnormal intake signal is generated, the gas delivery unit sends the abnormal intake signal to the gas delivery device and display device module, and displays the abnormal intake signal and issues an alarm through the gas delivery device and display device module.

[0045] Embodiment 2:

[0046] See also Figure 1 - Figure 2 As shown, the dust removal and filtering unit obtains the filter parameters during the nitrogen filtration process, wherein the filter parameters include the air pressure at both ends of the filter and the impact force of the filter. The dust removal and filtering unit compares the air pressure at both ends of the filter to obtain the air pressure difference at both ends of the filter;

[0047] The dust removal and filtering unit records the pressure difference at both ends of the filter as FC, the area of ​​each mesh in the filter as S, and the number of filters as N, where the number of filters is the number of meshes per unit area of ​​the filter. The dust removal and filtering unit generates the first blockage degree D1 of the filter through formula analysis. ;

[0048] The dust removal and filtration unit obtains the filter impact force, where the filter impact force is the pressure on the filter in the gas flow direction. The dust removal and filtration unit records the total area of ​​the filter as A and the filter impact force as FT. The second filter blockage degree D2 is generated through formula analysis. ;

[0049] The dust removal and filtering unit compares the first blockage degree D1 with the second blockage degree D2. If the difference between the first blockage degree D1 and the second blockage degree D2 is greater than a preset value, a calculation abnormality signal is generated, and the first blockage degree D1 and the second blockage degree D2 are invalidated, and the pressure difference at both ends, the filter impact force and other conditions are collected again, so as to generate a new first blockage degree D1 and a second blockage degree D2 again. If the difference between the newly generated first blockage degree D1 and the second blockage degree D2 is still greater than the preset value, a collection abnormality signal is generated, and the collection abnormality signal is sent to the display device through the network for sound and light alarm;

[0050] If the difference between the first blockage degree D1 and the second blockage degree D2 is less than a preset value, the first blockage degree D1 and the second blockage degree D2 are averaged, and the averaged result is sent to the filter cleaning unit as the operating condition of the dust removal net;

[0051] After obtaining the operating condition of the dust collector, the filtering and cleaning unit compares the operating condition of the dust collector with the preset blockage level, confirms the blockage level of the dust collector, and calls a pulse generator of corresponding intensity according to the blockage level of the dust collector. The pulse airflow is used to reversely pulse the dust collector to clean the dust collector.

[0052] Embodiment three:

[0053] See also Figure 1 - Figure 2 As shown, the nitrogen recovery parameters collected by the nitrogen recovery unit include recovery flow rate and recovery gas pressure;

[0054] The nitrogen recovery unit selects a preset time range, and performs arithmetic averaging on the recovered gas pressure within the preset time range, and records the arithmetic average result as the recovered average gas pressure;

[0055] The gas delivery unit obtains the same preset time range through the nitrogen recovery unit, and performs arithmetic averaging after counting the intake air pressure within the preset time range, and records the arithmetic average result as the intake air average pressure;

[0056] The nitrogen recovery unit obtains the average intake pressure through the gas delivery unit, compares the average intake pressure with the recovery average pressure, obtains the difference between the average intake pressure and the recovery average pressure, and records the difference as pressure loss;

[0057] The nitrogen recovery unit obtains the recovery flow rate and the corresponding time element at each moment within a preset time range, and obtains the total recovery flow rate within the preset time range by performing integral calculation on the recovery flow rate and the time element;

[0058] The gas delivery unit obtains the intake air flow rate at each moment within a preset time range, and performs integral calculation based on the intake air flow rate and the time element corresponding to the intake air flow rate to obtain the total intake air flow rate within the preset time range;

[0059] The nitrogen recovery unit obtains the total intake flow through the gas delivery unit, and calculates the difference between the total intake flow and the total recovery flow to obtain the flow loss, and calculates the ratio of the flow loss to the preset time range length to obtain the flow loss rate;

[0060] The nitrogen recovery unit takes the flow loss rate and air pressure loss as the recovery effect, and performs threshold analysis on the flow loss rate and air pressure loss. If any one of the flow loss rate and air pressure loss exceeds the preset threshold, an insufficient recovery effect alarm is generated; if neither the flow loss rate nor the air pressure loss exceeds the preset threshold, a normal recovery effect signal is generated.

[0061] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dry coke quenching dust removal pneumatic ash conveying system, characterized in that: It includes a gas delivery unit, which is used to control the delivery of nitrogen and obtain the intake parameters of nitrogen; A dust removal and filtration unit, which is used to obtain parameters in the nitrogen filtration process, and analyze the efficiency of dust removal according to the obtained parameters to obtain the operating conditions of the dust removal net; A filter cleaning unit, wherein the filter cleaning unit receives the operating condition of the dust removal net through the dust removal filter unit, and automatically matches the corresponding dust removal net cleaning process when the operating condition of the dust removal net is not good; A nitrogen recovery unit, which is used to recover the nitrogen at the tail end and collect nitrogen recovery data during the nitrogen recovery process to obtain nitrogen recovery parameters; The nitrogen recovery unit and the gas delivery unit communicate with each other, compare the nitrogen intake parameters with the nitrogen recovery parameters, obtain the nitrogen recovery effect, judge the nitrogen recovery effect, and generate an intelligent alarm; The air intake parameters collected by the gas delivery unit include air intake flow rate and air intake pressure; The nitrogen recovery parameters collected by the nitrogen recovery unit include recovery flow rate and recovery gas pressure; The nitrogen recovery unit selects a preset time range, performs arithmetic averaging on the recovery gas pressure within the preset time range, and obtains the recovery average gas pressure; the gas delivery unit obtains the same preset time range, performs arithmetic averaging on the intake gas pressure within the preset time range, and obtains the intake average gas pressure; The nitrogen recovery unit calculates the difference between the average intake pressure and the average recovery pressure, and records the difference as pressure loss; The nitrogen recovery unit performs integral calculations on the recovery flow rate and the time element within a preset time range to obtain a total recovery flow rate within the preset time range, and the gas delivery unit performs integral calculations on the intake flow rate and the time element within the preset time range to obtain a total intake flow rate within the preset time range; The nitrogen recovery unit calculates the difference between the total intake flow and the total recovery flow to obtain the flow loss, and calculates the ratio of the flow loss to the preset time range length to obtain the flow loss speed; The nitrogen recovery unit performs a threshold analysis on the flow loss rate and the air pressure loss, and generates an alarm of insufficient recovery effect if any one of the flow loss rate and the air pressure loss exceeds a preset threshold; The gas delivery unit compares the intake air flow rate with the required ash delivery gas flow rate, and if the intake air flow rate is less than the ash delivery gas flow rate, generates an intake air shortage signal to increase the intake air volume of the gas delivery device; If the intake air flow is not less than the ash conveying gas flow, the difference between the intake air flow and the ash conveying gas flow is calculated. If the difference is greater than a preset value, an intake redundancy signal is generated to reduce the intake volume of the gas conveying equipment.

2. A dry coke quenching dust removal pneumatic ash conveying system according to claim 1, characterized in that: The gas delivery unit calculates the difference between the maximum value and the minimum value of the intake air pressure to obtain the fluctuation amplitude of the intake air pressure; The gas delivery unit calculates the difference between the two groups of intake air pressures at all adjacent time points to obtain the pressure change speed, and averages the change speeds of all intake air pressures to obtain the intake air pressure fluctuation mean; The gas delivery unit analyzes the fluctuation amplitude of the intake air pressure and the fluctuation mean of the intake air pressure, obtains the stability of the intake air pressure according to the analysis result, and compares the intake air pressure stability with a preset stability threshold. If the intake air pressure stability is not greater than the preset stability, an intake abnormality signal is generated and sent to the gas delivery device and display device module.

3. The dry quenching dust removal pneumatic ash conveying system according to claim 1 is characterized in that: The filter parameters collected by the dust removal and filtering unit include the air pressure at both ends of the filter and the impact force of the filter. The dust removal and filtering unit compares the air pressure at both ends of the filter to obtain the air pressure difference at both ends of the filter; The dust removal and filtering unit records the pressure difference at both ends of the filter as FC, the area of ​​each mesh in the filter as S, and the number of filters as N, where the number of filters is the number of meshes per unit area of ​​the filter. The dust removal and filtering unit generates the first blockage degree D1 of the filter through formula analysis, D1 = FC*S 2 *N.

4. A dry coke quenching dust removal pneumatic ash conveying system according to claim 3, characterized in that: The dust removal and filtering unit records the total area of ​​the filter as A, the impact force of the filter as FT, and generates the second clogging degree D2 of the filter through formula analysis.

5. A dry coke quenching dust removal pneumatic ash conveying system according to claim 4, characterized in that: The dust removal and filtering unit compares the first blockage degree with the second blockage degree, and if the difference between the first blockage degree and the second blockage degree is greater than a preset value, generates a calculation abnormality signal, re-collects and calculates the new first blockage degree and the second blockage degree, and if the difference is still greater than the preset value, generates a collection abnormality signal; If the difference between the first blockage degree and the second blockage degree is less than a preset value, the first blockage degree and the second blockage degree are averaged, and the averaged result is sent to the filter cleaning unit as the operating condition of the dust removal net; After acquiring the operating condition of the dust removal net, the filtering and cleaning unit compares the operating condition of the dust removal net with a preset blockage level, confirms the blockage level of the dust removal net, and calls a pulse generator of corresponding intensity according to the blockage level of the dust removal net.

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