2.3 Advantages of brick billet body drying:
    The dryer developed by Baoshen group can draw the residual heat from the cooling belt of the kiln through the pipeline and enters the dryer in multiple points. The clean hot air passes through the billet body from the bottom to the top, and there are multiple circulation fans, so as to ensure the consistency of section temperature, pressure and humidity of different sections of the dryer, ensure the uniform heating and free shrinkage around the body, and avoid Shrinkage stress crack due to drying. Due to the forming level and the change of raw materials, the speed of chain plate is changed accordingly at any time, and the drying cycle is adjusted to ensure that the qualified rate of drying is almost 100%.

2.4 Advantages of product Improvement: 
With China national comprehensive ban policy concern the production of solid clay brick gradually strengthened, the dryer developed and manufactured by Baoshen group is more suitable for the production of hollow bricks and blocks with energy-saving and heat preservation performance requirements.. The production of wall brick with decoration function can achieve no "embossing" on the strip surface and meet the requirements of masonry clear wall. No matter the product specifications and models are transformed to meet the market demand, the technical parameters of the dryer are adjusted in a wide range, which will lay a solid foundation for the enterprises’ future development of high-quality , diversified and multi specification products.
2.5. Waste steam emission advantages: 
   The emission of air pollution in brick and tile industry, smoke and dust particles and other indicators are greatly affected by the conversion of oxygen content and the air volume of moisture discharge. The dryer developed by Baoshen group has sufficient hot air exchange and oxygen content of about 18%. The daily output of 200000 porous bricks is less than 10m3 / h. If 40m3 air volume is required for evaporation of 1kg water, the air volume is more than 300000 m3. According to the calculation of 200000 fast 240 × 115 × 90mm porous bricks (21.6%) per day, the air volume of the new dryer is less than 10m3 / h, only about 1 / 3 of the traditional air volume. It not only saves electricity, but also helps to reach the standard after pollutant emission conversion. Due to the high temperature of the hot air, it is beneficial to reduce the air volume, which is also consistent with the theoretical calculation.

2.6. Advantages of firing operation: 
   After drying, the moisture content of the green body has dropped below the critical moisture content, and the drying shrinkage of the green body has basically stopped. Only the firing shrinkage is considered after re coding kiln, but the firing shrinkage is small, which ensures the stability of the green stack during firing. Since more than half a year of production, there has been no collapse of the tunnel kiln. The embossing, black center and shrinkage stress crack are eliminated or reduced. As far as the number of kiln layers is concerned, as long as the range of firing temperature is allowed, there is no problem that the number of kiln layers is more than 18. The length of the tunnel kiln can be shortened properly with the increase of the amount of billets.

2.7 advantages of construction and installation:
   Factory made, short construction period, good quality, avoiding wet construction of tunnel drying chamber. New type dryer, on-site construction, installation, commissioning, short construction cycle, to achieve early production.

2.8 Advantages of design adjustment:
   Adjustable for different raw materials and products, regarding to the size of the product specification,the length ,height and drying cycle of the dryer can be adjusted respectively;
according to the porosity of the product, the chain plate speed can be adjusted to change the drying cycle. Small size, low void rate or solid brick products can be stacked in 1-3 layers so as to improve the output. According to the temperature and pressure of air supply, the air inlet position and hot air circulation system can be adjusted. Baoshen dryer is equipped with temperature, pressure, humidity and wind speed sensors to realize the air flow balance of the dryer, the upper and lower temperatures are the same, the humidity of each drying section is kept constant, and the technical parameters of the dryer are adjusted more simply and conveniently.
3. [Cost comparative analysis]

Take the following Figure 3 of primary code firing and Figure 4 of secondary code firing for instance,e.g. 200,000 pieces output per day, 4.6-4.8m tunnel kiln. The cost of drying kiln, tunnel kiln and workshop in the traditional one-time code firing process is compared and analyzed, but it does not include the equipment before the billet cutter, desulfurization and dust removal, power distribution and automation equipment, road hardening and other expenses.

Figure 3: plan of traditional one-time code firing process

Figure 4: process plan of the second code firing of the dryer of Baoshen group

3.1. Traditional one-time code burning process:
The process occupies a leading position in the existing brick factory, and its cost is: ① a tunnel drying room (calculated as 90m for example), including civil engineering, foundation work, fan, jacking machine, exit pulling machine, track, track foundation, track installation, three drying doors, air supply and tide discharge pipes, etc., with an estimated cost of 950,000 Chinese yuan (CNY); ② The roasting tunnel kiln is calculated as 140m, including the civil engineering, foundation and slab positioning machine of the tunnel kiln; the estimated cost is 3.5 million Chinese yuan (CNY); ③ 160 kiln cars are needed for drying, burning and the estimated cost is 4 million Chinese yuan (CNY); ④ the estimated cost is 700,000 Chinese yuan (CNY) for the top car machine, exit pulling machine, track, track foundation, track installation, 3 kiln doors, pipes on the kiln, etc.; ⑤ the workshop is about 9600 square meters. The simple workshop is calculated as 260 Chinese yuan (CNY) / square meter, and the estimated cost is 2.5 million Chinese yuan (CNY); ⑥ the estimated price of the whole rotary billet machine system is 450,000 Chinese yuan (CNY). The above total estimate is 12.1 million Chinese yuan (CNY).

3.2. The second code firing dryer of Baoshen group: 
① The estimated cost of tunnel kiln is 3.1 million Chinese yuan (CNY) based on 120m;
② Approx.65 kiln cars are needed, with an estimated cost of 1.63 million Chinese yuan (CNY);
③ The estimated cost of overhead crane, exit puller, track, track foundation, track installation, three kiln doors, and kiln pipes, etc. is 350,000 Chinese yuan (CNY);
④ The estimated cost of dryer: including kiln body, code dryer, code kiln car, etc. is 5.05 million Chinese yuan (CNY);
⑤ The plant is about 7200m2. The simple workshop is calculated as 260 Chinese yuan (CNY)/ m2, and the estimated cost is 1.87 million Chinese yuan (CNY). The above total estimated cost is 12.15 million RMB yuan (CNY).

3.3 Estimation of existing secondary code burning:
① Code burning system: including transport and grouping, pallet transportation and loading and unloading, code machine, dry blank grouping, 2 code kiln car robots, control system, etc., with an estimated price of 4.45 million Chinese yuan (CNY);
② Drying equipment: including 90 cyclones, 4 drying ferries, 2 drying traction positioning, 120 drying cars, 1920 pallets, etc.with an estimated price of 10.7 million Chinese yuan (CNY);
③ The estimated cost of tunnel kiln is 3.1 million Chinese yuan (CNY);
④ There are 65 kiln cars, with an estimated cost of 1.63 million Chinese yuan (CNY);
⑤ There are three kiln doors and pipes on the kiln, with an estimated cost of 350000 Chinese yuan (CNY);
⑥ The construction of drying room, including civil engineering and track installation, with an estimated cost of 1.9 million Chinese yuan (CNY);
⑦ There are 9500m2 workshops, with an estimated cost of 2.47 million yuan. The above total estimated cost is 24.6 million RMB yuan (CNY).

3.4 cost comparison and analysis

(1) Traditional one-time code burning: the estimated cost is 12.1 million Chinese yuan (CNY).Two natural dehydration cooling channels are considered: the estimated cost is 13.6 million Chinese yuan (CNY).

(2) Secondary code burning: the estimated cost is 24.6 million Chinese yuan (CNY).

(3) Baoshen dryer: the estimated cost is 12.15 million RMB yuan (CNY).

Based on the analysis of the above estimated cost, the dryer of Baoshen group’s second code is 50,000 Chinese yuan (CNY) higher than that of the first code procedure, only 0.41% higher. If considering the natural dehydration of two cooling channels after forming, the estimated cost is increased by more than 1.5 million Chinese yuan (CNY), 12% higher than the cost of the new dryer. Compared with the existing process of the second code procedure, the dryer of Baoshen group is 12.25 million Chinese yuan (CNY)lower, 49.8% lower. This comparative analysis fully shows that Baoshen group’s new type of secondary code firing dryer solution is one of the first options for new construction and transformation of brick and tile enterprises, which not only ensure the brick billets and finished products’ qualities are excellent, but also achieve outstanding price advantages and good market prospects..