Fire box with spiral guide wall

Abstract

The invention discloses a fire box with a spiral guide wall, which reduces the flowing speed of high-temperature flue gas flow between a rotary drum and the fire box, prolongs the retention time of the high-temperature flue gas flow, and effectively improves the heat exchange rate of flue gas and the rotary drum and the drying effect of wet carbon black particles. The problems of low heat energy utilization rate, low qualified rate of wet carbon black particles, poor quality and the like caused by over-fast flowing and non-uniform distribution of high-temperature flue gas between the fire box and the rotary drum are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon black industry, and in particular relates to a fire box matched with a rotary dryer. Background Art

[0002] For many years, the firebox used in the carbon black industry and matched with the dryer is a circular box composed of an inlet section, several intermediate sections and an outlet section. Its working process is: the high-temperature flue gas enters the gap between the firebox and the dryer drum from the flue gas inlet of the firebox inlet section to heat the outer surface of the drum, and then enters the drum after reaching the outlet section to mix with the wet carbon black particles and absorb the moisture on the surface of the wet carbon black particles to dry the wet carbon black particles.

[0003] The inner surface of the existing firebox is a smooth refractory material. The high-temperature flue gas flows directly to the outlet section from the flue gas inlet between the firebox and the drum, and enters the dryer drum through the elbow. The existing problems are: the high-temperature flue gas stays on the drum surface for a short time, most of it flows to the outlet section without completing the heat exchange, the inside and outside of the drum are heated unevenly, and the carbon black particles are transported out before the humidity reaches the process requirements, resulting in uneven moisture content of the carbon black particles, low pass rate and poor particle quality. If the process requirements are to be met, the only way is to increase the length of the drum and the firebox to extend the heating time of the high-temperature flue gas on the drum, which greatly increases the equipment manufacturing and installation costs, is difficult to install, and increases the equipment footprint.

[0004] After analysis and investigation, an innovative design of the firebox was made, and a firebox with a spiral guide wall was proposed. That is, on the basis of the original firebox, the structure of the refractory material on the inner surface of the firebox was changed to increase the residence time of the high-temperature flue gas between the firebox and the rotating drum, so that the temperature inside and outside the rotating drum is uniform and the quality of the dried carbon black particles is optimized. Summary of the invention

[0005] The present invention aims to introduce a firebox with a spiral guide wall, which includes: an inlet section, an end plate I, an intermediate section, an outlet section, an end plate II, a heat-insulating plate, a refractory material, a guide wall, and a support. The characteristics are as follows: the firebox is a circular box body composed of an inlet section, a plurality of intermediate sections and an outlet section, each section is divided into an upper and a lower part; the end faces of the inlet section and the outlet section are connected and sealed with an end plate I and an end plate II, and the bottom of the inlet section has a tangential smoke inlet; each section shell is lined with a heat-insulating plate and a refractory material, and the surface of the refractory material has intermittently raised trapezoidal guide walls; the firebox is provided with a heat-insulating plate and a refractory material, and the surface of the refractory material has intermittently raised trapezoidal guide walls; the firebox is provided with a heat-insulating plate and a refractory material, and the heat-insulating plate ... The flow wall and the guide wall are distributed in a spiral shape along the direction of smoke flow; the lower part of each shell section is provided with a support connected to the on-site foundation; the sections and the upper and lower parts of each section are connected with bolts; the firebox with the guide wall reduces the flow velocity of the high-temperature smoke flow between the drum and the firebox and prolongs its residence time, effectively improving the heat exchange rate between the smoke and the drum and the drying effect of the wet carbon black particles, and solves the problems of low thermal energy utilization rate, low qualified rate and poor quality of wet carbon black particles caused by the high-temperature smoke flowing too fast and unevenly distributed between the firebox and the drum.

[0006] On-site feedback shows that the drying effect is more obvious than the original fire box, the qualified rate of finished products is higher, and the drying time of wet carbon black particles is also shortened. At the same time, the length of the drum and fire box is also shortened accordingly, saving customers a lot of funds and production costs.

[0007] The main points of the firebox design of the present invention with a spiral inner guide wall are:

[0008] 1. The refractory surface uses a raised intermittent trapezoidal guide wall to slow down the speed of high-temperature flue gas flowing to the outlet section and prolong the residence time of high-temperature flue gas on the drum;

[0009] 2. The guide wall is distributed in a spiral shape along the direction of flue gas flow, so that the high-temperature flue gas is evenly distributed on the surface of the drum;

[0010] 3. The intermittent diversion wall has high strength, is not easy to be damaged, and has good manufacturing process.

[0011] The advantages of the present invention are:

[0012] 1. It solves the problem that the high-temperature flue gas flows too fast between the firebox and the dryer cylinder, resulting in poor drying effect of wet carbon black particles and low qualified rate of finished products;

[0013] Second, it solves the problem that the uneven heating on the surface of the dryer cylinder causes the carbon black particles to not meet the process requirements and have poor quality; Third, the addition of the spiral guide wall has a simple structure, is easy to manufacture, safe and reliable, improves the heat exchange rate between the high-temperature flue gas and the rotating drum, shortens the drying time of the wet carbon black particles, improves production efficiency, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structural principle of the present invention

[0015] Figure 2 The present invention Figure 1 AA section diagram

[0016] Figure 3 Expanded view of the inner wall guide wall of the present invention

[0017] Markings in the figure: 1-inlet section, 1.1-end plate I, 2-middle section, 3-outlet section, 3.2-end plate II, 4-insulation board, 5-refractory material, 6-support. DETAILED DESCRIPTION

[0018] A firebox with a spiral guide wall comprises: an inlet section 1, an end plate Ⅰ1.1, a middle section 2, an outlet section 3, an end plate Ⅱ3.2, an insulation board 4, a refractory material 5, a guide wall 5.1, and a support 6.

[0019] High-temperature flue gas enters the firebox from the tangent inlet at the bottom of the inlet section 1. The raised spiral guide walls 5.1 are intermittently distributed on the surface of each section of the refractory material 5; the spiral direction of the guide walls 5.1 follows the direction of flue gas flow.

[0020] The intermittent spiral guide wall 5.1 on the surface of the firebox refractory 5 is a brand-new design for the firebox, which solves the problems of poor drying effect of wet carbon black particles and low qualified rate of finished products caused by the short residence time of high-temperature flue gas between the firebox and the dryer drum for many years. It also improves the production capacity of the dryer, shortens the drying time of wet carbon black particles, and improves production efficiency.

[0021] Specific implementation process:

[0022] ① Usually, the shells of each section of the firebox are welded and the anchor nails are welded in the factory, and then the insulation board 4 is laid and the refractory material 5 is made after it is transported to the site;

[0023] ② After the firebox sections are transported to the site, the lower shells of the inlet section 1, the middle sections 2 and the outlet section 3 of the firebox are assembled first and installed on the foundation through the support 6 of each section, and then the insulation board 4 is installed and the refractory 5 is poured;

[0024] ③ The upper shell of each firebox is laid with insulation board 4 and poured with refractory material 5 on the site platform;

[0025] ④ The spiral guide wall 5.1 is intermittently built at the transition point from the firebox inlet section 1 to the upper section;

[0026] ⑤ Refractory 5 shall be maintained in accordance with the casting process requirements;

[0027] ⑥ After the dryer drum is installed in place, buckle the upper part of each section of the firebox onto the corresponding lower part of the firebox; ⑦ Adjust the gap between the shells of each section, seal the joints of each section with ceramic fiber pads and then connect them into one with bolts; ⑧ Check whether each seal meets the requirements, and tighten all bolts as required if qualified.

Claims

1. A firebox with a spiral guide wall, comprising: An inlet section (1), an end plate I (1.1), an intermediate section (2), an outlet section (3), an end plate II (3.2), an insulation plate (4), a refractory material (5), a guide wall (5.1), and a support (6), characterized in that: the firebox is a circular box body composed of an inlet section (1), a plurality of intermediate sections (2) and an outlet section (3), and each section is divided into an upper and lower part; the end faces of the inlet section (1) and the outlet section (3) are provided with an end plate I (1.1) and an end plate II (3.2) connected and sealed; the inner lining of each section shell is provided with an insulation plate (4) and a refractory material (5); the lower part of each section shell is provided with a support (6) connected to the on-site foundation; the sections and the upper and lower parts of each section are connected by bolts.

2. A firebox with a spiral guide wall according to claim 1, characterized in that: The bottom of the inlet section (1) is provided with a tangential flue gas inlet.

3. A firebox with a spiral guide wall according to claim 1, characterized in that: The surface of the refractory material (5) is provided with intermittently raised trapezoidal guide walls (5.1), and the guide walls (5.1) are distributed in a spiral shape along the direction of flue gas flow.

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