Use of flue gas desulfurization waste of fire coal and method for using the same in alkaline land planting

A technology for desulfurization waste and coal-fired flue gas is applied in the field of tree planting in saline-alkali land and in the field of tree-planting in saline-alkali land, which can solve the problems of difficult and unusable soil improvement and utilization, and achieves good application prospects, less water consumption, and faster improvement effects.

Inactive Publication Date: 2009-01-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is a large area of ​​unusable saline-alkali land in northern my country, and this kind of soil is extremely difficult to improve and utilize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: In 2006, in the suburb of Hohhot, Inner Mongolia, 200 mu of saline-alkali land was selected for afforestation experiments. The soil in the afforestation area is mainly alkaline soil and alkaline soil, and has salinization characteristics at the same time. The degree of alkalization is 25% to 45%, and the pH is 8.5 to 10.4. The crops to be planted are poplar and weeping willow, with a trunk diameter of 5-8cm and a trunk height of 3m. After leveling the land, dig a tree pit. The size of each tree pit is 2.5m×3.5m×1m (pit depth), and the shape is a cuboid (easy to operate by the excavator). The peripheral area is the desulfurization waste improvement area. The soil is dug out and the wet flue gas desulfurization waste of Shanxi Datong Power Plant is used, in which CaSO 4 2H 2 O accounts for 90% of the total weight of coal-fired flue gas desulfurization waste. Put 15kg / 1m of desulfurization waste 3 Soil, organic fertilizer 0.3 m3 / pit and sand mixed with 1 m3 / ...

Embodiment 2

[0031] Example 2: In Yuehai Park in Yinchuan, Ningxia in 2007, 430 mu of saline-alkali land was selected for afforestation. The soil in the afforestation area is mainly alkaline soil and alkaline soil. Alkalinity is 25% to 45%. The crops planted are Xinjiang poplar, weeping willow, sandy date, Chinese pagoda tree, and Amorpha fruticosa, with a trunk diameter of 2 to 3 cm. After leveling the land, dig tree pits. The size of each tree pit is 1m×1m×1m. Using wet flue gas desulfurization waste from Haibowan Power Plant in Inner Mongolia, where CaSO 4 2H 2 O accounts for 86% of the total weight of coal-fired flue gas desulfurization waste. Put 15kg / 1m of desulfurization waste 3 After the soil is evenly mixed, backfill the pit, lay 10cm thick gravel on the bottom of the pit, put the saplings into the pit, and immediately irrigate with water to fully dissolve the desulfurization waste to complete the chemical reaction, so as to achieve the purpose of improving the soil, and then...

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Abstract

An application of desulphurized waste of coal fired flue gas and an application method thereof for saline alkali land forestation belong to the technical field of saline alkali land improvement. For the application method, soil samples are firstly taken and analyzed to obtain pH values, total salt contents and alkalization degrees of different sections, different amounts of the desulphurized waste of coal fired flue gas are applied according to the alkalization degrees of the saline alkali land, and saline-alkali resistant trees such as Populus bolleana lauche, Populus popularis, weeping willow, Chinese scholar tree, and the like, can be chosen for planting. In the planting process, the land is firstly uniformly leveled, the dimension of a surrounding tree well is determined by the size of the tree, soil is taken out, then the desulphurized waste of flue gas and an organic fertilizer with different proportions and the original soil are uniformly mixed and backfilled to the well, a sapling is put into the tree well and water is irrigated instantly until water fully wets the well, when the soil turns to be white and grey, water is irrigated once more until water fully wets the well, irrigation and daily management are carried out according to the soil water status. The application of the desulphurized waste of flue gas and the application method thereof for saline alkali land forestation, on the one hand, causes the desulphurized waste of coal fired flue gas to be economically and effectively utilized and changes wastes into valuables, on the other hand, provides a method for planting trees in saline alkali land.

Description

technical field [0001] The invention relates to a tree planting process in saline-alkali land, in particular to a method for planting trees in saline-alkali land by using coal-fired flue gas desulfurization waste, and belongs to the technical field of saline-alkali land improvement. Background technique [0002] Sulfur dioxide in coal-fired flue gas is a key emission indicator monitored by the national environmental protection department. The development and application of flue gas desulfurization technology is developing rapidly in my country. SO removal from coal-fired flue gas 2 One of the processes is wet flue gas desulfurization. SO in the cleaned flue gas 2 After that, a large amount of waste residue will be produced, the main component of which is CaSO 4 2H 2 O. These waste residues will take up a large area of ​​storage space every year. Therefore, whether the flue gas desulfurization project can continue to operate, the key issue is whether it can find a way t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G23/04B09C1/08C09K17/06
CPCY02A40/22Y02P60/40
Inventor 陈昌和李跃进李彦孙兆军段广德王淑娟方亮禚玉群赵博徐旭常
Owner TSINGHUA UNIV
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