A method for adjusting materials to eliminate low-temperature freezing blockage.

Abstract

This invention relates to a method for eliminating low-temperature freezing blockage of materials. The method includes the following steps: Step 1, modifying the equipment on the east, west, and north sides of the existing feeding device by adding steam inlet pipes, a top temperature measuring device, steam jet nozzles, a bottom heat conduction device, and a condensate recovery tank device; Step 2, after modifying and installing the equipment in Step 1, adjusting it according to the blockage situation on site; Step 3, first detecting the physical temperature of the incoming material through the temperature measuring device on the top of the feeding device. When its physical temperature T>A℃, the steam shut-off valve K1 of the feeding device is closed, and the steam regulating valve K2 is also closed. This solution quickly eliminates low-temperature freezing blockage during the feeding process, which is beneficial to the smooth operation of ironmaking production, has both economic and environmental value, and meets the requirements of sustainable development.

Description

Technical Field

[0001] This invention relates to an adjustment method, specifically an adjustment method for eliminating low-temperature freezing and material blockage, belonging to the field of material optimization and feeding technology in industries such as mineral processing, coking, ironmaking, and metallurgy. Background Technology

[0002] In recent years, with the further development of the steel industry, the supply of process raw materials such as ore dressing, coking, and sintering / pelletizing plays a crucial role in blast furnace production. Therefore, these raw materials are supplied to blast furnaces through processes such as pre-storage in silos, feeding via feeders, screening, and conveyor belt transport. Current silo and feeding device designs can meet the storage and feeding needs of most dry raw materials. However, for wet materials with high moisture content, when the ambient temperature is too low, the high moisture content causes freezing and caking, leading to blockages in the feeding process and severely impacting production. In severe cases, excessive freezing and caking of wet materials can overwhelm the silo walls and feeders, resulting in equipment damage and significant maintenance costs.

[0003] Meanwhile, during the current winter season when ambient temperatures are low, wet materials freeze and clump together. Companies often resort to manual unblocking methods, which not only have poor unblocking effects but also pose numerous safety hazards and are prone to accidents, thus failing to guarantee employee safety and production rhythm.

[0004] A search revealed that Chinese utility model patent application number 202022224463.X discloses an anti-sticking and clogging silo for cement production. By installing specific equipment such as a filter screen, vibrator, feed cutter, and high-polymer PE board, it can effectively solve the problem of wet material sticking to the inner wall and clogging the discharge port. However, this method requires significant modifications to existing process equipment and the installation of multiple specific devices, resulting in excessively high investment costs. Furthermore, it only considers the issue of wet material sticking to the inner wall and does not account for situations where the external environment is too cold, causing the wet material to freeze and clump together, significantly reducing the effectiveness of the method.

[0005] For example, Chinese utility model patent application number 201620239654.4 discloses an automatic vibration-based material feeding device to prevent blockage. By modifying multiple parts of the feeding device, it uses the collision of materials during the feeding process as power to trigger spring vibration, thus preventing frequent blockages in the feeding trough. However, this method does not actually consider the requirements for material strength and particle size in ironmaking production. After implementing this method, the raw material's strength is significantly reduced due to mechanical collision, and its particle size is also broken, failing to meet production particle size requirements, thus restricting normal production rhythm and making it difficult to apply to the steel industry. Therefore, a new solution is urgently needed to address the above technical problems. Summary of the Invention

[0006] The present invention precisely aims at the problems existing in the prior art and provides an adjustment method for eliminating low-temperature freezing and blocking of materials. In view of the low-temperature freezing and agglomeration blocking during the feeding process, the present invention utilizes the steam generated in the iron and steel industry. Through a minor modification of the existing feeding device, the steam is reasonably distributed in the feeder and, due to its high thermal conductivity, quickly eliminates the low-temperature freezing and blocking during the feeding process, which is beneficial to the smooth progress of ironmaking production. At the same time, a condensate recovery device is installed at the lower part of the feeder, which can be used for recycling in the iron and steel industry, having double economic and environmental value and meeting the requirements of sustainable development.

[0007] To achieve the above object, the technical solution of the present invention is as follows. An adjustment method for eliminating low-temperature freezing and blocking of materials, the method comprising the following steps:

[0008] Step 1: Modify the equipment on the east, west, and north sides of the existing feeding device (the south side is the discharge port), and add devices such as a steam inlet pipeline, a top temperature measuring device, a steam injection nozzle, a bottom plate heat conduction device, and a condensate recovery tank;

[0009] Step 2: After modifying and installing the equipment in Step 1, adjust according to the on-site blocking situation;

[0010] Step 3: First, detect the physical temperature of the incoming material (the average temperature of the incoming material within a certain time range) through the temperature measuring device at the top of the feeder. When its physical temperature T > A °C, the steam cut-off valve K1 of the feeding device described in this invention is in the closed state, and the steam regulating valve K2 is also in the closed state;

[0011] Step 4: When its physical temperature T < A °C, further detect the feeding speed of the incoming material (the average feeding speed of the incoming material within a certain time range) according to the feeding speed measuring device. If the feeding speed P > B, the steam cut-off valve K1 of the feeding device described in this invention is in the closed state, and the steam regulating valve K2 is also in the closed state;

[0012] Step 5: When its physical temperature T < A °C, further detect the feeding speed of the incoming material (the average feeding speed of the incoming material within a certain time range) according to the feeding speed measuring device. If the feeding speed P < B, the steam cut-off valve K1 of the feeding device described in this invention is in the open state, the steam regulating valve K2 is in the open state, and the adjustment progress of the steam regulating valve K2 is a%.

[0013] Among them, in Step 1, the steam comes from the steam generated in iron and steel production, and an electrical steam cut-off valve, a flow regulating valve, a field mechanical steam cut-off valve, and a regulating valve are set at its source position;

[0014] The on-off of the electrical steam cut-off valve and the flow regulating valve is controlled by the central control room;

[0015] In Step 1, an emergency safety cut-off valve is set in the steam inlet pipeline;

[0016] In step 1, the opening position of the steam inlet pipe should be 1 / 6h-1 / 10h from top to bottom of the bottom heat conduction device;

[0017] In step 1, the steam jet nozzles are arranged symmetrically, and there are two series of nozzles, A and B.

[0018] The A-series nozzles consist of three parts, with A1, A2, and A3 positioned at 1 / 8L, 1 / 2L, and 7 / 8L respectively from left to right along the bottom heat conduction device.

[0019] The B-series nozzles consist of two parts, with B1 and B2 located at 1 / 4L and 3 / 4L respectively from left to right on the bottom heat conduction device.

[0020] The east, west, and north sides of the feeding device are fully enclosed by welding or other methods.

[0021] The aforementioned base plate heat conduction device should be a common metal plate with high thermal conductivity and low price;

[0022] The condensate recovery tank is located at the bottom of the base plate heat conduction device, and its width should be 1.5-2.5cm and its height should be 3.5-4.5cm. A condensate circulation pipe is installed on its far right side for use as circulating water in the steel industry.

[0023] In step 3, the value of A is the minimum physical temperature required for the incoming material to agglomerate at low temperature, in °C, and its value is determined according to the physicochemical properties of the incoming material.

[0024] In step 4, the value of B is the material feeding speed that meets the on-site process requirements, in kg / min or t / h, and its value is determined according to the on-site process and raw material batching requirements.

[0025] In step 5, the formula for calculating the adjustment progress 'a' value of the steam regulating valve K2 is as follows:

[0026] a = Q O / Q Z ,%;

[0027] Q O The physical heat required to eliminate material agglomeration is kJ;

[0028] Q Z The physical heat of the injected steam, in kJ;

[0029] The Q O The formula for calculating the value is:

[0030] Q O =ε*C*M*(TT) A )*w, KJ;

[0031] C is the specific heat capacity, kJ / (kg*℃), which is generally taken as 4.2;

[0032] M is the total mass of the incoming material, in kg, M = P * t;

[0033] w represents the moisture content of the incoming material, in %;

[0034] ε is the excess coefficient, ranging from 1.1 to 1.3, determined by the characteristics of the raw materials;

[0035] The Q Z The formula for calculating the value is:

[0036] Q Z =H*q*t, KJ;

[0037] H represents the enthalpy of the injected steam, in kJ / kg;

[0038] q is the flow rate of the injected steam, in g / min;

[0039] t is the total time for steam injection, in minutes;

[0040] Step 6: After steam shut-off valve K1 is in the open state and steam regulating valve K2 is adjusted to a%, the physical temperature T of the incoming material and the feeding speed P are fed back simultaneously. If T>A and P>B are satisfied, the steam regulating valve K2 is adjusted to b%. If T>A and P>B cannot be satisfied at the same time, step 5 is repeated.

[0041] The regulating progress b value of the steam regulating valve K2 is determined by calculation, where 0≤b≤a;

[0042] The formula for calculating the adjustment progress b value of the steam regulating valve K2 is as follows:

[0043] b = μ*a, %;

[0044] In the formula for calculating the value of b, μ is an adjustment coefficient, and 0.1 ≤ μ ≤ 0.6.

[0045] After step 6 above, the steam shut-off valve K1 is in the open state and the steam regulating valve K2 is adjusted to b%, the incoming material physical temperature T and the incoming material feeding speed P are fed back simultaneously. If T>C and P>D are satisfied, then the steam shut-off valve K1 of the feeding device of the present invention is in the closed state, and the steam regulating valve K2 is also in the closed state; if T>C and P>D cannot be satisfied at the same time, then step 6 is repeated.

[0046] In step 7, the incoming material physical temperature C value is set by calculation;

[0047] The formula for calculating the physical temperature C of the incoming material is as follows:

[0048] C = A + T0, ℃;

[0049] In the formula for calculating the C value, T0 is a correction parameter, and 1≤T0≤5;

[0050] The material feeding speed D value is set by calculation;

[0051] The formula for calculating the material feeding speed D is as follows:

[0052] D = η * B, kg / min or t / h;

[0053] In the formula for calculating the D value, η is a correction parameter, where 1.05 ≤ η ≤ 1.25.

[0054] Compared with the prior art, the present invention has the following advantages: (1) The technical solution introduces steam for steel production by making minor modifications to the existing equipment. Through the reasonable arrangement of steam pipelines and spatial positions, the low temperature freezing blockage can be effectively eliminated, ensuring smooth production.

[0055] (2) The present invention preheats the metal base plate with steam, utilizes the high thermal conductivity of metal, and combines appropriate auxiliary steam flow to quickly eliminate low-temperature frozen blockage, improve elimination efficiency, and minimize the impact of low-temperature frozen blockage.

[0056] (3) The present invention installs a temperature measuring device on the feeder and a flow steam regulating valve and a steam shut-off valve on the steam pipeline. The steam switch and flow rate are controlled by the feedback of the temperature measuring device and the program calorific value calculation module, which can realize automatic adjustment of steam flow rate. At the same time, the feeder blockage warning can be realized by the feedback of the temperature measuring device program and the calorific value calculation module, which helps to adjust the feed rate of the silo.

[0057] (4) By rationally arranging steam pipelines and spatial locations, the present invention significantly reduces labor costs and effectively eliminates human safety hazards, thereby reducing the accident rate.

[0058] (5) This invention uses a condensate recovery device installed at the bottom of the feeder for recycling in the steel industry, which meets the company's environmental protection policy and has both economic and environmental value, and meets the requirements of sustainable development. Attached Figure Description

[0059] Figure 1 A side view and a simplified diagram of the blast furnace charging device;

[0060] Figure 2 This is a simplified diagram of the steam pipeline layout for the feeding device in this application;

[0061] Figure 3 This is a simplified dimensional diagram showing the arrangement of the steam nozzles in the feeding device of this application;

[0062] Figure 4 This is a flowchart of the steam switch and automatic flow control of this application.

[0063] T represents the physical temperature of the incoming material detected by the temperature measuring device at the top of the feeder (the average temperature of the incoming material within a certain time range), and A and C are the set values.

[0064] P is the material feeding speed detected by the material speed measuring device (the average speed of material feeding within a certain time range), and B and D are set values;

[0065] K1 is the steam shut-off valve of the feeding device described in the invention, where "1" represents open and "0" represents closed; K2 is the steam regulating valve of the feeding device described in the invention, where "1" represents open and "0" represents closed, and a and b represent its opening degree. Detailed Implementation

[0066] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0067] Example 1: See Figures 1-4 A method for eliminating low-temperature freezing blockage, comprising a steam inlet pipeline, a top temperature measuring device, a steam injection nozzle, a bottom heat conduction device, and a condensate recovery tank, includes the following steps:

[0068] Step 1: Modify the existing feeding device on the east, west and north sides (the south side is the discharge port) by adding steam inlet pipeline, top temperature measuring device, steam jet nozzle, bottom plate heat conduction device, condensate recovery tank and other devices.

[0069] The steam is derived from the steam produced in the steel industry, and it is equipped with an electric steam shut-off valve, a flow regulating valve, and a field mechanical steam shut-off valve and regulating valve at the source.

[0070] The electrical steam shut-off valve and flow regulating valve are controlled by the central control room.

[0071] An emergency safety shut-off valve is installed in the steam inlet pipeline;

[0072] The opening position of the steam inlet pipe should be 1 / 6h-1 / 10h from top to bottom of the bottom heat conduction device;

[0073] The steam jet nozzles are arranged symmetrically, and there are two series of nozzles, A and B.

[0074] The A-series nozzles consist of three parts, with A1, A2, and A3 positioned at 1 / 8L, 1 / 2L, and 7 / 8L respectively from left to right along the bottom heat conduction device.

[0075] The number of B-series nozzles is 2, and B1 and B2 are respectively arranged at the 1 / 4L and 3 / 4L positions from left to right of the bottom heat conduction device;

[0076] In step 1, the three sides of the east, west, and north of the blanking device are fully enclosed by welding or other methods;

[0077] In step 1, the bottom heat conduction device should be a common metal plate with high thermal conductivity and low price;

[0078] In step 1, the condensate recovery tank is arranged at the bottom of the bottom heat conduction device, and its width should be 1.5 - 2.5 cm, and its height should be 3.5 - 4.5 cm. A condensate circulation pipeline is installed on its rightmost side for the recycling of circulating water in the iron and steel industry;

[0079] In step 2, after the equipment in step 1 is modified and installed, it is adjusted according to the on-site blockage condition;

[0080] In step 3, first, the physical temperature of the incoming material (the average temperature of the incoming material within a certain time range) is detected by the temperature measuring device at the top of the blanking device. When its physical temperature T > A °C, the steam cut-off valve K1 of the blanking device of this invention is in the closed state, and the steam regulating valve K2 is also in the closed state;

[0081] In step 3, the value of A is the lowest physical temperature required for the low-temperature agglomeration of the incoming material, °C, and its value is determined according to the physical and chemical properties of the incoming material;

[0082] In step 4, when its physical temperature T < A °C, then further detect the blanking speed of the incoming material (the average blanking speed of the incoming material within a certain time range) according to the material speed measuring device. If the blanking speed P > B, the steam cut-off valve K1 of the blanking device of this invention is in the closed state, and the steam regulating valve K2 is also in the closed state;

[0083] In step 4, the value of B is the blanking speed that the incoming material meets the on-site process requirements, kg / min or t / h, and its value is determined according to the on-site process and raw material batching requirements;

[0084] In step 5, when its physical temperature T < A °C, then further detect the blanking speed of the incoming material (the average blanking speed of the incoming material within a certain time range) according to the material speed measuring device. If the blanking speed P < B, the steam cut-off valve K1 of the blanking device of this invention is in the open state, the steam regulating valve K2 is in the open state, and the adjustment progress of the steam regulating valve K2 is a%;

[0085] In step 5, the adjustment progress a value of the steam regulating valve K2 is the steam flow rate that meets the elimination of low-temperature freezing blockage, %, and its value is determined by calculation, 0 ≤ a ≤ 100;

[0086] In step 5, the formula for calculating the adjustment progress 'a' value of the steam regulating valve K2 is as follows:

[0087] a = Q O / Q Z ,%;

[0088] In step 5, in the formula for calculating the value of 'a', Q... O The physical heat required to eliminate material agglomeration is kJ;

[0089] In step 5, in the formula for calculating the value of 'a', Q... Z The physical heat of the injected steam, in kJ;

[0090] In step 5, the Q O The formula for calculating the value is:

[0091] Q O =ε*C*M*(TT) A )*w, KJ;

[0092] Step 5, Q O In the formula for calculating the value, C is the specific heat capacity, kJ / (Kg*℃), which is generally taken as 4.2;

[0093] Step 5, Q O In the value calculation formula, M is the total mass of the incoming material, in kg, M = P * t;

[0094] Step 5, Q O In the formula for calculating the value, w represents the moisture content of the incoming material, in %.

[0095] Step 5, Q O In the formula for calculating the value, ε is the excess coefficient, which takes a value of 1.1-1.3 and is determined by the characteristics of the raw materials;

[0096] In step 5, Q Z The formula for calculating the value is:

[0097] Q Z =H*q*t, KJ;

[0098] Step 5, Q Z In the formula for calculating the value, H is the enthalpy of the injected steam, in kJ / kg;

[0099] Step 5, Q Z In the formula for calculating the value, q is the flow rate of the injected steam, in g / min;

[0100] Step 5, Q Z In the formula for calculating the value, t is the total time for steam injection, in minutes;

[0101] Step 6: After steam shut-off valve K1 is in the open state and steam regulating valve K2 is adjusted to a%, the physical temperature T of the incoming material and the feeding speed P are fed back simultaneously. If T>A and P>B are satisfied, the steam regulating valve K2 is adjusted to b%. If T>A and P>B cannot be satisfied at the same time, step 5 is repeated.

[0102] In step 6, the adjustment progress b value of the steam regulating valve K2 is determined by calculation, where 0≤b≤a;

[0103] In step 6, the formula for calculating the adjustment progress b value of the steam regulating valve K2 is as follows:

[0104] b = μ*a, %;

[0105] In step 6, in the formula for calculating the value of b, μ is an adjustment coefficient, and 0.1 ≤ μ ≤ 0.6;

[0106] Step 7: After the steam shut-off valve K1 is in the open state and the steam regulating valve K2 is adjusted to b%, the incoming material physical temperature T and the incoming material feeding speed P are fed back simultaneously. If T>C and P>D are satisfied, then the steam shut-off valve K1 of the feeding device of the present invention is in the closed state, and the steam regulating valve K2 is also in the closed state; if T>C and P>D cannot be satisfied at the same time, then step 6 is repeated.

[0107] In step 7, the incoming material physical temperature C value is set by calculation;

[0108] In step 7, the formula for calculating the physical temperature C of the incoming material is:

[0109] C = A + T0, ℃;

[0110] In step 7, T0 is a correction parameter in the formula for calculating the C value, where 1 ≤ T0 ≤ 5;

[0111] In step 7, the material feeding speed D value is set by calculation;

[0112] In step 7, the formula for calculating the material feeding speed D is:

[0113] D = η * B, kg / min or t / h;

[0114] In step 7, η is a correction parameter in the formula for calculating the D value, where 1.05 ≤ η ≤ 1.25.

[0115] Specific Implementation Example: This example was conducted at the No. 4 blast furnace of a steel plant, with an effective volume of 3200m³. 3The daily raw material batch is 142 tons, the ore batch is 92 tons, and the average daily iron production is 8400 tons. The main raw material parameters are shown in Table 1. In this embodiment, the lump ore bin is used as an example. The moisture content of the lump ore is 3.5% according to technical testing.

[0116] Table 1. Main raw material parameters at the No. 4 blast furnace process site of a steel plant.

[0117]

[0118] The present invention provides a feeding device and its adjustment method for eliminating low-temperature freezing blockage, comprising the following steps:

[0119] Step 1: Modify the existing feeding device on the east, west, and north sides (the south side is the discharge port) by adding steam inlet pipes, top temperature measuring devices, steam jet nozzles, bottom plate heat conduction devices, condensate recovery tanks, and other devices.

[0120] In step 1, the steam is sourced from the steam produced in the steel industry, and an electric steam shut-off valve, a flow steam regulating valve, and a field mechanical steam shut-off valve and flow steam regulating valve are installed at the source.

[0121] In step 1, the electric steam shut-off valve and the flow steam regulating valve are controlled by the central control room.

[0122] In step 1, an emergency safety steam shut-off valve is installed in the steam inlet pipeline;

[0123] In step 1, the opening position of the steam inlet pipe should be 1 / 8h from the bottom of the heat conduction device;

[0124] In step 1, the steam jet nozzles are arranged symmetrically, and there are two series of nozzles, A and B.

[0125] The A-series nozzles consist of three parts, with A1, A2, and A3 positioned at 1 / 8L, 1 / 2L, and 7 / 8L respectively from left to right along the bottom heat conduction device.

[0126] The B-series nozzles consist of two parts, with B1 and B2 located at 1 / 4L and 3 / 4L respectively from left to right on the bottom heat conduction device.

[0127] In step 1, the east, west, and north sides of the feeding device are fully enclosed by welding or other methods.

[0128] In step 1, the heat-conducting device for the base plate should be a common metal plate with high thermal conductivity and low price;

[0129] In step 1, the condensate recovery tank is arranged at the bottom of the bottom plate heat conduction device, with a width of 2 cm and a height of 4 cm. A condensate water circulation pipe is installed on its rightmost side for the recycling of circulating water in the iron and steel industry;

[0130] In step 2, after the equipment in step 1 is modified and installed, adjust according to the on-site blockage condition;

[0131] In step 3, first, detect the physical temperature of the lump ore (the average temperature of the lump ore within a certain time range) through the temperature measuring device at the top of the feeder. When its physical temperature T > A °C, the steam cut-off valve K1 of the feeder described in this invention is in the closed state, and the steam regulating valve K2 is also in the closed state;

[0132] In step 3, the value of A is the lowest physical temperature required for the low-temperature agglomeration of the lump ore, °C. In this embodiment, A = -2 °C, and through technical detection, the moisture content of the lump ore is 3.5%;

[0133] In step 4, when its physical temperature T < A °C, further detect the feeding speed of the lump ore (the average feeding speed of the lump ore within a certain time range) through the feeding speed measuring device. If the feeding speed P > B, the steam cut-off valve K1 of the feeder described in this invention is in the closed state, and the steam regulating valve K2 is also in the closed state;

[0134] In step 4, in this embodiment, the value of B = 1.800 t / h = 1800 kg / min;

[0135] B = 142 * 18.4 * 1000 / (24 * 60) = 1800 kg / min;

[0136] In step 5, when its physical temperature T < A °C, further detect the feeding speed of the lump ore (the average feeding speed of the lump ore within a certain time range) through the feeding speed measuring device. If the feeding speed P < B, the steam cut-off valve K1 of the feeder described in this invention is in the open state, the steam regulating valve K2 is in the open state, and the adjustment progress of the steam regulating valve K2 is a%;

[0137] In step 5, the calculation formula for the adjustment progress a value of the steam regulating valve K2 is:

[0138] a = Q O / Q Z , %;

[0139] In step 5, in the a value calculation formula, Q O is the physical heat required to eliminate the agglomeration of the incoming material, KJ;

[0140] In step 5, in the a value calculation formula, Q Z is the physical heat of the sprayed steam, KJ;

[0141] In step 5, Q O The formula for calculating the value is:

[0142] Q O =ε*C*M*(TT) A )*w, KJ;

[0143] Step 5, Q O In the formula for calculating the value, C is the specific heat capacity, kJ / (Kg*℃), which is generally taken as 4.2;

[0144] Step 5, Q O In the value calculation formula, M is the total mass of the incoming material, in kg, M = P * t;

[0145] Step 5, Q O In the calculation formula, w is the moisture content of the incoming material, which was determined to be 3.5% in this embodiment;

[0146] Step 5, Q O In the value calculation formula, ε is the excess coefficient, which is taken as 1.2 in this embodiment;

[0147] In step 5, Q Z The formula for calculating the value is:

[0148] Q Z =H*q*t, KJ;

[0149] Step 5, Q Z In the formula for calculating the value, H is the enthalpy of the injected steam, in kJ / kg;

[0150] Step 5, Q Z In the formula for calculating the value, q is the flow rate of the injected steam, in g / min;

[0151] Step 5, Q Z In the formula for calculating the value, t is the total time for steam injection, in minutes;

[0152] In this embodiment, the value of 'a' is calculated to be 40% using the above formula.

[0153] Step 6: After steam shut-off valve K1 is in the open state and steam regulating valve K2 is adjusted to a%, the physical temperature T of the lump ore and the feeding speed P of the lump ore are fed back simultaneously. If T>A and P>B are satisfied, the steam regulating valve K2 is adjusted to b%. If T>A and P>B cannot be satisfied at the same time, step 5 is repeated.

[0154] In step 6, the adjustment progress b value of the steam regulating valve K2 is determined by calculation, where 0≤b≤a;

[0155] In step 6, the formula for calculating the adjustment progress b value of the steam regulating valve K2 is as follows:

[0156] b = μ*a, %;

[0157] In step 6 of this embodiment, in the formula for calculating the value of b, μ = 0.2 and b = 8%.

[0158] Step 7: After the steam shut-off valve K1 is in the open state and the steam regulating valve K2 is adjusted to b%, the physical temperature T of the lump ore and the feeding speed P of the lump ore are fed back simultaneously. If T>C and P>D are satisfied, then the steam shut-off valve K1 of the feeding device of the present invention is in the closed state, and the steam regulating valve K2 is also in the closed state; if T>C and P>D cannot be satisfied at the same time, then step 6 is repeated.

[0159] In step 7, the physical temperature C value of the lump ore is set by calculation;

[0160] In step 7, the formula for calculating the physical temperature C value of the lump ore is:

[0161] C = A + T0, ℃;

[0162] In step 7 of this embodiment, the formula for calculating the value of C contains T0 = 4 and C = 2.

[0163] In step 7, the block ore feeding speed D value is set by calculation;

[0164] In step 7, the formula for calculating the block ore feeding speed D is:

[0165] D = η * B, kg / min or t / h;

[0166] In step 7 of this embodiment, the formula for calculating the value of D is η = 1.1 and D = 1.98t / h.

[0167] Comparative Example 1:

[0168] This comparative example is based on routine production, similar to Example 1, and follows the same process parameters as the No. 4 blast furnace in a steel plant, with an effective volume of 3200 m³. 3 The daily batch of raw materials is 142 tons, the daily batch of ore is 92 tons, and the daily output of molten iron is 8400 tons. The main raw material parameters are shown in Table 1. Taking the lump ore bin as an example, the moisture content of the lump ore is 3.5% according to technical testing. The difference is that: Comparative Example 1 did not modify and adjust the feeding device according to the technical means of this application. The manual hand-held mechanical device was used for material cleaning. The average production value of one month was used to examine the parameters such as the material blockage time of the feeding port, the manual handling time, and the manual handling cost in a day under low temperature conditions, and the data are recorded in Table 2.

[0169] Comparative Example 2:

[0170] This comparative example is based on routine production, similar to Example 1, and follows the same process parameters as the No. 4 blast furnace in a steel plant, with an effective volume of 3200 m³. 3 The daily batch of raw materials is 142 tons, the daily batch of ore is 92 tons, and the daily output of molten iron is 8400 tons. The main raw material parameters are shown in Table 1. Taking the lump ore bin as an example, the moisture content of the lump ore is 3.5% according to technical testing. The difference is that the treatment method of Comparative Example 2 is to use a manual hand-held steam pipe to directly blow steam into the lump ore feeding device, and does not reasonably control the flow rate according to the flow rate regulation method of this application. The average production value of one month is used to examine the parameters such as the material blockage time of the feeding port, the manual handling time, the handling time interval, and the manual handling cost in a day under low temperature conditions, and the data are recorded in Table 2.

[0171] Table 2 Comparison of Implementation and Comparative Application Results

[0172]

[0173] The following conclusions can be drawn from the comparative data analysis of the implementation and comparative application effects in Table 2:

[0174] (1) When comparing Example 1 and Comparative Example 1, the material blockage in Comparative Example 1 is more frequent. Each shift requires 2-3 workers to clean the blockage regularly, and the processing interval is short. Blockage needs to be dealt with in time, which can affect production in severe cases. At the same time, the labor cost is high and the safety hazard is significant. In contrast, this application introduces steam from steel production through minor modifications to the existing equipment. Through the reasonable arrangement of steam pipelines and spatial location, the low-temperature freezing blockage can be effectively eliminated, ensuring smooth production. At the same time, combined with appropriate auxiliary steam flow, the low-temperature freezing blockage can be quickly eliminated, improving the elimination efficiency and minimizing the impact of low-temperature freezing blockage. In addition, the labor cost can be greatly reduced, and the safety hazards of manual labor can be effectively eliminated, reducing the accident rate.

[0175] (2) When comparing Example 1 and Comparative Example 2, the treatment method of Comparative Example 2 is to use manual hand-held steam pipe to directly blow steam into the lump ore feeding device. The flow rate adjustment method of this application is not reasonably controlled. One worker is required to clean the blockage at regular intervals per shift. However, since no condensate recovery device is used, the condensate around the silo will freeze, causing workers to slip and fall, resulting in excessive safety risks and failing to meet environmental protection requirements. In addition, due to the lack of reasonable flow regulation, the total daily steam volume in Comparative Example 2 was 1.2-1.6t. However, the present invention, by installing a temperature measuring device on the feeder and a flow regulating valve and a steam shut-off valve on the steam pipeline, and controlling the steam switch and flow through the feedback of the temperature measuring device and the program calorific value calculation module, can achieve automatic steam flow regulation. In Example 1, the total daily steam volume is only 0.2-0.6t, and the steam saving rate can be as high as 400%, saving 1t of steam per day. At the same time, by installing a condensate recovery device at the bottom of the feeder, it can be used for recycling in the steel industry, meeting the company's environmental protection policy, and has both economic and environmental value, which meets the requirements of sustainable development.

[0176] This invention addresses the issues of low-temperature freezing and material blockage during the feeding process. By utilizing steam generated in the steel industry and making minor modifications to the existing feeding device, the steam is rationally distributed within the feeder and, through its high thermal conductivity, quickly eliminates low-temperature freezing and blockage during feeding, thus facilitating smooth ironmaking production. Simultaneously, a condensate recovery device is installed at the bottom of the feeder, which can be recycled within the steel industry, offering both economic and environmental benefits and meeting the requirements of sustainable development.

[0177] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A conditioning method to eliminate low temperature freeze-ups, characterized in that, The method comprises the following steps: Step 1, equipment modification is carried out on the east side, west side and north side of the existing discharging device, steam inlet pipeline, top temperature measuring device, steam spraying nozzle, bottom heat conduction device and condensate recovery tank device are added; Step 2, after the equipment in step 1 is modified and installed, the adjustment is carried out according to the site plugging condition; Step 3, first, the physical temperature of the incoming material is detected by the top temperature measuring device of the discharging device, when the physical temperature T > A ℃, the steam cut-off valve K1 of the discharging device is in the closed state, and the steam regulating valve K2 is also in the closed state; Step 4, when the physical temperature T < A ℃, the discharging speed of the incoming material is further detected according to the material speed measuring device, if the discharging speed P > B, the steam cut-off valve K1 of the discharging device is in the closed state, and the steam regulating valve K2 is also in the closed state; Step 5, when the physical temperature T < A ℃, the discharging speed of the incoming material is further detected according to the material speed measuring device, if the discharging speed P < B, the steam cut-off valve K1 of the discharging device is in the open state, the steam regulating valve K2 is in the open state, and the adjustment progress of the steam regulating valve K2 is a%; In step 3, A is the minimum physical temperature required for low-temperature caking of the incoming material, ℃, which is determined according to the physical and chemical properties of the incoming material; In step 4, B is the discharging speed of the incoming material meeting the site process requirements, kg / min or t / h, which is determined according to the site process and raw material batching requirements; In step 5, the calculation formula of the steam regulating valve K2 adjustment progress a value is: a=Q O / Q Z ,%; Q O Physical heat required to eliminate incoming lumps, KJ; Q Z Physical heat of steam injected, KJ; The Q O The formula for calculating the value is: Q O = ɛ * C * M * (T - A) * w, KJ C is the specific heat capacity, KJ / (Kg*℃), taking 4.2; M is the total mass of the incoming material, Kg, M = P * t; W is the water content of the incoming material, %; Epsilon is the excess coefficient, taking 1.1-1.3, which is determined by the characteristics of the raw material; The Q Z The formula for calculating the value is: Q Z =H*q*t, KJ; H is the enthalpy value of the sprayed steam, KJ / Kg; Q is the flow of the sprayed steam, g / min; T is the total time of the sprayed steam, min.

2. The adjustment method for eliminating low-temperature frozen plugging according to claim 1, characterized in that: In step 1, the steam is derived from the steam of steel production, and an electric steam cut-off valve, a flow regulating valve and a site mechanical steam cut-off valve and a regulating valve are arranged at the source position; The electric steam cut-off valve and the flow regulating valve are controlled by the central control room; In step 1, an emergency safety cut-off valve is arranged on the steam inlet pipeline; In step 1, the opening position of the steam inlet pipeline should be at the 1 / 6h-1 / 10h position from top to bottom of the bottom heat conduction device; In step 1, the arrangement mode of the steam spraying nozzle is symmetrical arrangement, and there are A and B two series of arranged nozzles; The number of A series nozzles is 3, wherein A1, A2 and A3 are arranged at the 1 / 8l, 1 / 2l and 7 / 8l positions from left to right of the bottom heat conduction device respectively; The number of B series nozzles is 2, wherein B1 and B2 are arranged at the 1 / 4l and 3 / 4l positions from left to right of the bottom heat conduction device respectively; The east side, west side and north side of the discharging device are fully closed by welding; The bottom heat conduction device should be a common metal plate with high heat conductivity and low price. The arrangement position of the condensate water recovery tank is at the bottom of the bottom plate heat conduction device, and the width thereof is 1.5-2.5 cm, and the height thereof is 3.5-4.5 cm, and the rightmost side thereof is provided with a condensate water circulating pipeline, which is used for recycling water in the steel industry.

3. The conditioning method to eliminate cryogenic freeze-ups of claim 2, wherein, In step 6, after the steam cut-off valve K1 is opened and the adjustment progress of the steam regulating valve K2 is a%, the physical temperature T of the incoming material and the discharging speed P of the incoming material are fed back, and if T>A and P>B are satisfied, the adjustment progress of the steam regulating valve K2 is b%; if T>A and P>B cannot be satisfied at the same time, step 5 is repeated; The value of the adjustment progress b of the steam regulating valve K2 is determined by calculation, and 0≤b≤a; The calculation formula of the value of the adjustment progress b of the steam regulating valve K2 is: b = μ * a, In the calculation formula of the value b, µ is an adjustment coefficient, and 0.1≤µ≤0.

6.

4. The conditioning method to eliminate cryogenic freeze-ups of claim 3, wherein, After the steam cut-off valve K1 is opened and the adjustment progress of the steam regulating valve K2 is b% in step 6, the physical temperature T of the incoming material and the discharging speed P of the incoming material are fed back, and if T>C and P>D are satisfied, the steam cut-off valve K1 of the discharging device is closed, and the steam regulating valve K2 is also closed; if T>C and P>D cannot be satisfied at the same time, step 6 is repeated. In step 5, the value of the physical temperature C of the incoming material is set by calculation; The calculation formula of the value of the physical temperature C of the incoming material is: C=A+T0, ℃; In the calculation formula of the value C, T0 is a correction parameter, and 1≤T0≤5; The value of the discharging speed D of the incoming material is set by calculation; The calculation formula of the value of the discharging speed D of the incoming material is: D= ɳ*B, kg / min or t / h; In the calculation formula of the value D, ɳ is a correction parameter, and 1.05≤ɳ≤1.25.

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