In view of the improvement of NO X emission control requirements for coal-fired units, traditional PID controllers have been unable to effectively control large delay, large inertia, nonlinear, time-varying SNCR denitration systems, and most advanced control algorithms are often object-based models. Therefore, a model of SNCR denitration system based on adaptive weight particle swarm optimization algorithm is established. A 2 × 200MW heating steam turbine generator set equipped with a 2 × 705t/h circulating fluidized bed boiler was used as the test unit, and the selective non-catalytic reduction technology denitration system was analysed. The particle swarm optimization algorithm with adaptive weights was used to model the relationship between the urea flow rate and the NOX concentration at the chimney outlet of the SNCR denitration system under working conditions of 140 MW, 170 MW and 200 MW, respectively, to provide a process for the automatic control of the SNCR denitration systemmodel. Apply the actual data from the field to verify the model. The results show that the error between the output of the model and the actual operational data is within the allowable range, which verifies the validity of the model. This result opens up a new path for the particle swarm optimization algorithm to model the SNCR denitration process, and promotes the application of intelligent algorithms in other industrial processes.

Based on the investigation data of Jiaozhou Bay in May and October of 1979, the content and distribution of salinity in bottom layer in Jiaozhou Bay were studied. The results showed that in May and October, the variation range of salinity in Jiaozhou Bay water was 31.09-31.55 %o, and the salinity of sea water was over 31.09 %o. This showed that in the aspect of salinity change, in May and October, in the whole bottom layer of Jiaozhou Bay, the salinity of water body was relatively high. In May, in the bottom, the variation range of salinity in Jiaozhou Bay was 31.49-31.55 %o, and the salinity of sea water was relatively high. There was a low salinity area in the bottom of Jiaozhou Bay mouth. In the inner and outer waters of the bay mouth, the salinity was higher. The results showed that the salinity in Jiaozhou Bay was high and the salinity of the water outside the bay was high. In October, in the bottom layer, the variation range of salinity in Jiaozhou Bay was 31.09-31.21 %o, and the salinity of sea water was relatively low. There was a low salinity area in the bottom water outside the mouth of Jiaozhou Bay. Compared with the bay mouth and the water inside the bay mouth, the salinity of the water outside the bay mouth was relatively low, and the interval length of salinity change was 0.12 %o, and the salinity change from the outside of the bay mouth to the inside of the bay mouth was relatively small. In May, a low salinity area appeared in the bottom of Jiaozhou Bay mouth. In the inner and outer waters, the salinity was higher. In October, a series of decreasing parallel lines with different gradients were formed from the bottom high salinity water area in the inner side of the bay mouth to the bottom low salinity water area in the outerside of the bay mouth.

based on the survey data of Cd content in Jiaozhou Bay in May, August and October of 1992, the paper studies the process of ocean current transport and the source of Cd content in Jiaozhou Bay. The spatial variation of Cd content from source transport in May, August and October is shown according to Dongfang Yang's matter content migration rule, which is revealed with the model block diagram. The location, size, type and time scale of source of Cd content transport are also determined. There were three main sources of Cd content in Jiaozhou Bay, from run-off transport, river transport and main sea current transport. Rivers carried Cd content in excess of 0.96μg/L over the year, slightly polluting land and rivers. In addition, Cd content in run-off and main sea current was greater than 1.10μg/L, which means the whole land and ocean were slightly polluted by Cd content. Among rivers flowing into Jiaozhou Bay, there are four major rivers which carried Cd content into the waters of Jiaozhou Bay: Haibo River, Licun River, Loushan River and Dagu River. According to Cd content in the river, from high to low was: Dagu River > Licun River > Loushan River > Haibo River. The Cd content transport time scale of Licun River, Loushan River and Dagu River was the same, while that of Haibo River was shorter. The mechanism of land transport and sea transport is put forward by authors, and the mechanism of alternating migration of Cd content between land and sea is revealed. In May, the land began transporting large quantities of Cd into the sea; from May to August, the land transported Cd content to the sea for three months; In August, the transport from land to sea ended, and the main sea current began to transport Cd content in large quantities; from August to October, the main sea current transported Cd content to the ocean for two months; In October, transport of the main sea current ended, and rivers began to carry Cd to the ocean again. The Cd content transported by northern run-off in May was 1.10μg/L and the Cd content transported by main sea current in August was 1.11μg/L, which further confirmed the authors' theory of matter uniformity. It can be seen that the Cd content transported by land and by sea was the same. Thus land and sea had the consistency of matter content.

In recent years, the photovoltaic industry in desert and Gobi has developed rapidly. In order to reveal the effect of photovoltaic industry on sand prevention and control, this study was performed by taking GuLang Zhenfa photovoltaic DC field on the southern edge of Tengger Desert as an example. Through continuous observation of air temperature, wind speed and air pressure inside and outside the photovoltaic field, combined with the investigation of vegetation inside and outside the photovoltaic field in desert and Gobi of the central and eastern part of Hexi Corridor, this study analyzed the ecological effect of photovoltaic industry on sand prevention and control from three aspects: the balance of surface heat by the transformation of solar radiation of desert photovoltaic, the function of wind barriers and sand barriers of the photovoltaic DC field, and the effect of the photovoltaic DC field on vegetation. The results showed that the photovoltaic DC field in desert and Gobi had very significant ecological functions for desert prevention and control, and the ecological functions were mainly as follows: 1) the photovoltaic DC field could effectively transform solar radiation, adjust the thermal balance of the desert, and weaken the power (i.e., the gale) for the occurrence and development of sandstorms and sand flow; 2) the photovoltaic panel had a strong function of wind barriers, and its function of wind-proof and sand-fixing were several times that of sand barriers; 3) the rain-collecting effect of photovoltaic panel could promote the growth of plants. The development of photovoltaic industry in desert and Gobi not only has remarkable economic benefits, but also has the ecological function of sand prevention and control. China has a vast area of desert and Gobi, and there are broad prospects for the development of desert and Gobi photovoltaic industry. The photovoltaic industry in desert and Gobi is expected to become the third new way of sand prevention and control after afforestation and desertification control and sand fixation by sand barriers.

Based on the investigation data of Jiaozhou Bay in 1992, the vertical distribution and seasonal variation of Hg in the surface and bottom layers from the center of the bay to the southeast of the bay were studied, and the seasonal distribution, variation range and horizontal distribution trend of Hg content in the surface and bottom layers were determined. The results showed that in May, August and October, in Jiaozhou Bay, from the central water area to the coastal water area in the southeast of the Bay, from the surface layer to the bottom layer, the range of Hg content in the bottom layer and the surface layer was: 0.007-0.040 μg/L, which conformed to the national water quality standard of class I seawater, and the water was not polluted by any Hg content. From May to October, in the central waters of Jiaozhou Bay, the seasonal changes of Hg content in the surface layer from low to high were spring, summer and autumn, and the seasonal changes of Hg content in the bottom layer from low to high were autumn, spring and summer. In the surface of the coastal waters in the southeast of Jiaozhou Bay, the seasonal changes of Hg content in the surface and bottom layers from low to high were autumn, spring and summer. The author put forward the law of Hg deposition: in summer, marine organisms propagated in large numbers, but in spring and autumn, there was no large number of marine organisms propagated. In this way, the Hg content sediment depended entirely on the combination of zooplankton, phytoplankton and floating particles in the sea water. Therefore, in summer, a large amount of Hg was taken to the seabed, while in spring and autumn, no large amount of Hg was taken to the seabed. In May, August and October, the change of Hg content in the surface and bottom layers fully confirmed the settlement law. Moreover, it was believed that a large number of marine organisms in the water were the main carriers to bring a large number of Hg to the seabed. Therefore, the variation of Hg content in the bottom was determined by the surface Hg content and the vehicles that transport Hg content vertically to the sea bottom, which resulted in the fact that the horizontal distribution trend of Hg content in the surface and bottom was same.

Applying the survey data of the Cd content in the water of Jiaozhou Bay in October 1992, from the southern waters of the bay mouth to the southeastern waters, the author calculates out the horizontal loss amount, the vertical disputed amount and the vertical sediment amount of the Cd content in the surface and bottom of the water body and determines the model block diagram of the horizontal and vertical changes of Cd content, based on the content changing models of the horizontal matter and the vertical matter proposed by the author himself. The calculation results show that in October, the absolutely horizontal increase amount of Cd content in the surface and bottom layer is 0.12-0.89μg/L, and the relatively horizontal increase amount of Cd content in the surface and bottom layer is 23.52-74.78%. In the southern waters of the bay mouth, the Cd content in the surface and bottom layer has an absolutely vertical disputed amount of 0.09μg/L, and its relatively vertical disputed amount is 23.07%. In the southeastern waters of the bay, the Cd content in the surface and bottom layer has an absolutely vertical sediment amount of 0.68μg/L, and its relatively vertical sediment amount is 57.14%. There is the Haibo River near the southeastern waters of Jiaozhou Bay. In October, the Cd content of the Haibo River is 0.51μg/L, which is higher than the Cd content of 0.39μg/L carried by ocean currents. It provides a lot of supplements to the ocean currents passing the southeastern waters of the bay. During the horizontal migration of the Cd content in the surface and bottom layer, Haibo River supplements the Cd content in the ocean current with the loss and increase of the surface and bottom layer. Through the horizontal changing model of matter content, the horizontal increase of the surface Cd content is calculated. The absolute increase of the Cd content is 0.12μg/L, and the relative increase is 23.52%. Similarly, the horizontal increase of Cd content in the bottom layer is calculated. The absolute increase of Cd content is 0.89μg/L, and the relative increase is 74.78%. During the vertical migration process, the vertical change of the Cd content in the southern waters of the bay mouth and the southeastern waters of the bay reveals the following law: when the surface Cd content is low, the waters present a vertical dilution of the Cd content at the surface and bottom layer, and there is no Cd content accumulation on the seafloor. When the Cd content in the surface layers is high, the waters present a vertical accumulation of Cd content in the surface and bottom layers, and there is an accumulation of Cd content on the seafloor. According to the formula for calculating the Cd content of river sources proposed by author himself, the Cd content of the surface of Haibo River source from land is calculated to be 1.01 μg/L.