The attached figure shows the basic structure of the free-settlement vertical slag cooler (Figure 1) and the tandem structure ( figure 2 ) Two embodiments. In order to make the sandwich shell have a standardized structure, strong resistance to deformation, and stability during operation, evenly distributed support and positioning ribs (1B, 2B) are arranged in the inner and outer box sandwich shells. The existence of these ribs integrates the inner and outer shell layers, which not only has greater rigidity and strength, but also ensures the normal flow of circulating water in the water cavity.
 The positioning support ribs 3 set up between the inner and outer boxes (1, 2) are not only for the positioning and supporting relationship between the inner and outer boxes, but also are heat absorption and hot slag guide plates. Therefore, the number, location and shape of its establishment have a great relationship with the working quality of the slag cooler. The simplest is the rectangular plane plate structure, which can set 3-6 channels in the direction of the generatrix between the two cones. In this way, the setting and processing are simple and the cost is low. It can also be designed into a curved plate shape or a spiral plate shape, which will obtain better heat exchange efficiency, but it is more complicated to manufacture.
 As can be seen from the structure of Figures 1 and 2, after the hot slag enters the umbrella-shaped and inverted-umbrella-shaped hot slag channels from the slag inlet 4 on the outer box, it is divided by the support positioning plate 3 and follows the cone umbrella channel. Sliding downwards, this umbrella-shaped channel is determined by the cone umbrella surface between the inner and outer box end faces. The sliding force depends on the cone apex angle. The horizontal inclination angle α is determined by the cone apex angle, and the value of the α angle is 8° -18°. If the α angle is too small, it is easy to cause blockage of the hot slag passage. If the α angle is too large, the hot slag will slide too fast in the passage and affect the heat exchange effect. The α angle determined by the experiment is between 8°-18°.
 In order to adapt to the large flow of hot slag discharge, it is necessary to speed up the time from the slag inlet to the slag outlet. However, the efficiency of heat exchange requires a longer residence time in the box. To this end, we can adopt a double-box tandem structure, or even a three-box tandem structure when necessary. The series assembly method is very simple, as long as the slag outlet and the slag inlet of another box are butt welded or connected in series with a flange. The cooling water pipe can circulate independently in sections, or it can be connected in series to form a circulating water circuit. Taking into account that the root of the slag connection is the stress concentration point, a reinforcing connecting rib 11 can be placed between the two series boxes. The ribs are made into a flat plate or made into a cylindrical shape and fixed to the two series outer boxes. Between the outer shells.
 In order to well control the flow of hot slag in the box, a receiving platform can be set under the lowermost discharge port, and a material shifter can be set on the side of the platform to regularly remove the cold slag on the receiving platform. Adjusting the rotation speed of the material dial can achieve quantification, and also control the slag flow at timing to achieve the most ideal heat exchange process.
 The vertical slag cooler made according to the above design has low cost, simple operation, convenient maintenance, large processing capacity, and energy saving. It is a key improvement to the structure of the slag cooler.